New EH representation for MSVC compatibility

[majnemer]

Summary

This introduces new instructions neccessary to implement MSVC-compatible
exception handling support. Most of the middle-end and none of the
back-end haven't been audited or updated to take them into account.

[JosephTremoulet]

lib/IR/Verifier.cpp

187–188

Could this be split out to check catches and cleanups separately? The CoreCLR's personality uses different types (cleanups are not provided a pointer to the in-flight exception).

[majnemer]

lib/IR/Verifier.cpp

187–188

Sure, will do.

[majnemer]

• Let ehblock instructions have different result types

[JosephTremoulet]

LGTM, I think all my comments have been addressed except for adding something about the new UB to the langref (and personally I'd be inclined to add a note to the section on catchendblock that it should be the unwind target of invokes between its catchblocks and their catchrets).

[majnemer]

• Let ehblock instructions have different result types
• Address Joseph's latest review comments.

[JosephTremoulet]

Spotted a typo. Also, is a plain 'ret' allowed to implicitly close all catches/cleanups, or is it UB to return without catchret/cleanupret?

Thanks.

docs/LangRef.rst

5233–5234

s/its catchendblock/a corresponding catchret/
s/a catchendblock/its catchendblock/

[majnemer]

• Let ehblock instructions have different result types
• Address Joseph's latest review comments.
• Fix typo spotted by Joseph

[majnemer]

In D11097#207129, @JosephTremoulet wrote:

Spotted a typo.

Typo has been fixed.

Also, is a plain 'ret' allowed to implicitly close all catches/cleanups, or is it UB to return without catchret/cleanupret?

Executing that ret would be UB.

[JosephTremoulet]

Also, is a plain 'ret' allowed to implicitly close all catches/cleanups, or is it UB to return without catchret/cleanupret?

Executing that ret would be UB.

Should the langref indicate this? I don't see anywhere that it currently does.

[majnemer]

• Add a comment for ret from catchblock/cleanupblock

[JosephTremoulet]

Looks good to me.

[reames]

What is the relation between this patch and http://reviews.llvm.org/D11041? They seem to include some of the same code.

A couple of specific comments, but nothing approaching a full review.

docs/LangRef.rst

8421

Is there anywhere in the docs that give context for why these instructions are needed and when they should be used instead of landingpad? If not, this should be done before checkin. Despite the discussion on llvmdev, I still don't feel like I understand the use case enough to really review the design.

include/llvm/IR/Instruction.h

392

As mentioned elsewhere, I find the name "Block" confusing in this function name. Please change.

Actually, why is this a predicate on the instruction at all? Isn't this a property of the containing block?

lib/IR/Verifier.cpp

2819

This looks like a fix for an existing deficiency in the verifier right? Not specific to the new instructions? If so, please submit this separately.

2867

The property of being a single instruction is a block is repeated in several of these. It would make sense to have this checked in a common helper routine which includes the terminator checks as well.

2900

Why not exit on 2nd one found?

2909

The use of the name "isEHBlock" on an *Instruction* seems highly misleading. Please change this. That function name on a BasicBlock makes sense, but not on a Instruction.

2953

TerminateBlock is a highly confusing name if this is EH specific. "Doesn't every block have a terminator?"

[majnemer]

In D11097#209327, @reames wrote:

What is the relation between this patch and http://reviews.llvm.org/D11041? They seem to include some of the same code.

D11041 was an older version of this patch, I'd ignore it.

A couple of specific comments, but nothing approaching a full review.

docs/LangRef.rst

8421

I don't think that the LangRef is the right place to discuss which set of EH-related IR is most appropriate for a frontend. I think it would make more sense in ExceptionHandling.rst or maybe a new file in the docs/Frontend directory.

We introduced these new instructions because of constraints imposed by our personality routine. For example:

• we need to be able to statically determine which invokes occurred in a catch block.
• it is impossible to lower @llvm.eh.typeid.for for our personality routine.

These constraints make landingpad/resume inappropriate, especially in the face of optimizations. These new instructions allow us maintain enough information in IR-form that we can lower it into a representation our personality will be happy with.

For example, we can easily find all the code for a try body's catch handlers by examining the unwind labels and operands of its relevant CatchBlockInsts and tracing execution to relevant CatchRetInsts. Such an operation would be impossible in the landingpad scheme because control flow can leave "exceptional" code back to "normal" code through a branch instruction.

include/llvm/IR/Instruction.h

392

I'm all for changing the Block suffix given a reasonable suggestion.

It is on instruction because we have instructions called CatchBlockInst, CleanupBlockInst, etc. The predicate answers the question if it is one of these "FooBlock" instructions.

lib/IR/Verifier.cpp

2819

Sure, removed.

2900

Just to make the code simpler, it would be optimizing for a case that would never happen in practice.

2909

The instructions have "Block" in the name, hence "Block" in the function's name.

2953

I'm open to suggestions, it's the best name we could come up with.

[majnemer]

@reames thinking about it a little more, would you be happier with CatchPadInst instead of CatchBlockInst, etc. and isEHPad instead of isEHBlock?

[reames]

In D11097#209367, @majnemer wrote:

@reames thinking about it a little more, would you be happier with CatchPadInst instead of CatchBlockInst, etc. and isEHPad instead of isEHBlock?

That would help. Reusing block causes confusion with the widespread use of "block" to refer to a basic block in the code base.

More generally, consistency in the terminology would be a good thing. Let me lay out my current understanding:

• A X-"pad" is a place the exceptional control flow might resume.
• A catch is a specific type of "pad" which models a language/ABI level catch clause. A catch is exception type specific.
• A cleanup is a specific type of "pad" which models scope exit without an explicit exception type.
• Both catch and cleanup are statically scoped. There's a begin and end construct for each.

In this context, what is a terminateblock? It's clearly a "pad", but why is not just a cleanup?

On the topic of motivation, I still feel like I'm missing a lot. In particular, it feels like the catchpad, cleanuppad, and terminatepad are really close to what's already described by landingpad(*). I get that you need to prevent merging of catch blocks, but why isn't a single "pad fence" at the end of each clause which is unmergeable solve that problem?

• We might end up changing how you describe a catch clause, but the idea is already there. You do seem to need different arguments then the existing catch clause bits.

p.s. For the record, I'm asking for my own understanding not because I oppose the proposal.

docs/LangRef.rst

8421

I agree that the LangRef would be the wrong place for this. I don't really care where it ends up, but I do want to see the motivation documented.

In particular, when should the older scheme be used vs this one? Are you planning on deprecating the old mechanism? Is this essentially Windows only? I honestly couldn't answer any of those questions if asked today.

lib/IR/Verifier.cpp

2900

I was only asking from the perspective of code clarity. Having the extra counter variable makes me thing it's going to be used for something.

[rnk]

In D11097#209400, @reames wrote:

In D11097#209367, @majnemer wrote:

@reames thinking about it a little more, would you be happier with CatchPadInst instead of CatchBlockInst, etc. and isEHPad instead of isEHBlock?

I like the pad terminology. The block terminology came about because we're really imbuing some special properties on the whole BasicBlock. Currently the landingpad instruction is the only instruction with the power to make an edge unsplittable, for example. Anyway, pad sounds good to me.

That would help. Reusing block causes confusion with the widespread use of "block" to refer to a basic block in the code base.

More generally, consistency in the terminology would be a good thing. Let me lay out my current understanding:

• A X-"pad" is a place the exceptional control flow might resume.
• A catch is a specific type of "pad" which models a language/ABI level catch clause. A catch is exception type specific.
• A cleanup is a specific type of "pad" which models scope exit without an explicit exception type.
• Both catch and cleanup are statically scoped. There's a begin and end construct for each.

In this context, what is a terminateblock? It's clearly a "pad", but why is not just a cleanup?

Currently, Clang expresses noexcept() as a catch-all clause that simply calls terminate. This is inefficient for both Itanium and MSVC because both LSDA tables can express noexcept with a single bit. We do it because it makes it possible to inline one noexcept function into another EH scope without teaching the inliner that it should transform some function attribute into LLVM IR that makes some C++ runtime function call.

Terminatepad solves this all by keeping data as data, allowing late IR preparation passes to expand the IR into code (catch-all or filter) or leave it alone if it can be encoded in the table.

On the topic of motivation, I still feel like I'm missing a lot. In particular, it feels like the catchpad, cleanuppad, and terminatepad are really close to what's already described by landingpad(*). I get that you need to prevent merging of catch blocks, but why isn't a single "pad fence" at the end of each clause which is unmergeable solve that problem?

• We might end up changing how you describe a catch clause, but the idea is already there. You do seem to need different arguments then the existing catch clause bits.

Yeah, they are the same set of clauses. :) However, with the new instructions, we won't need to do impossibly error-prone pattern matching.

How would a "pad fence" statically indicate that after running this cleanup, the next EH action is that catch block over there? Right now we try to figure this out by walking the CFG and trying to find the next conditional branch based on a comparison of the EH selector value. I think the primary failure mode of WinEHPrepare today is that we inline a destructor containing control flow, and then this analysis falls over. I'd rather not have to do dataflow analysis to rediscover this very basic nesting property of the C++ source code.

Essentially, the new instructions are exactly that: a really strong "pad fence" that keeps all the data and control flow transfers that we want to know about grouped together.

[majnemer]

• Let ehblock instructions have different result types
• Address Joseph's latest review comments.
• Fix typo spotted by Joseph
• Add a comment for ret from catchblock/cleanupblock
• Tidy-up some middle end pieces
• Rename the new instructions from FooBlock to FooPad

[JosephTremoulet]

lib/IR/BasicBlock.cpp

337

Surprised this is just CatchEndPad; don't CatchPad and TerminatePad have the same restrictions?

[majnemer]

lib/IR/BasicBlock.cpp

337

CatchPad can be split (for the purposes of SplitBlockPredecessors) by:

1. Creating a new BB
2. Cloning the CatchPad into the new BB
3. Moving relevant PHI nodes to the new BB
4. Hooking up relevant predecessors to unwind to the new BB

TerminatePad can be "split" using a similar mechanism.

The name of the function might need some work...

[JosephTremoulet]

lib/IR/BasicBlock.cpp

337

The name of the function might need some work...

Yes, I think the name was throwing me off. Looking at what SplitBlockPredecessors does, this makes sense. Which suggests the name canSplitPredecessors

CatchPad can be split (for the purposes of SplitBlockPredecessors) by:
1.Creating a new BB
2.Cloning the CatchPad into the new BB
3.Moving relevant PHI nodes to the new BB
4.Hooking up relevant predecessors to unwind to the new BB

Some questions about this:

1. Will callers find this useful, or are they expecting that the new BB will be one they can insert instructions into prior to branching to the original BB?
2. Do you need to add a step for inserting another BB, successor to the new catchpad, with a catchret?
3. Could the same approach work equally well for catchendpad except changing #2 from "cloning the CatchPad into the new BB" to "inserting a new CatchPad into the new BB"? Is the problem that we don't have a general way to compute the arguments of a catch-all CatchPad?

[majnemer]

• Let ehblock instructions have different result types
• Address Joseph's latest review comments.
• Fix typo spotted by Joseph
• Add a comment for ret from catchblock/cleanupblock
• Tidy-up some middle end pieces
• Rename the new instructions from FooBlock to FooPad
• Rename isSplittable to canSplitPredecessors

[majnemer]

• Make canSplitPredecessors a little mroe conservative for now

[majnemer]

@reames, can we iterate on the documentation in-tree now that we have D11565 out for review? It would be a big help.

[majnemer]

• Let ehblock instructions have different result types
• Address Joseph's latest review comments.
• Fix typo spotted by Joseph
• Add a comment for ret from catchblock/cleanupblock
• Tidy-up some middle end pieces
• Rename the new instructions from FooBlock to FooPad
• Rename isSplittable to canSplitPredecessors
• Make canSplitPredecessors a little mroe conservative for now
• Fixup for trunk
• Inliner changes

[rnk]

I think we've generated enough consensus around this design, and it's time to commit this and work incrementally in tree. I wrote up more motivation for the design in D11565.

docs/LangRef.rst

 block should be executed after the current block is finished. These
 terminator instructions typically yield a '``void``' value: they produce
 control flow, not values (the one exception being the
 ':ref:`invoke <i_invoke>`' instruction).
 
 The terminator instructions are: ':ref:`ret <i_ret>`',
 ':ref:`br <i_br>`', ':ref:`switch <i_switch>`',
 ':ref:`indirectbr <i_indirectbr>`', ':ref:`invoke <i_invoke>`',
-':ref:`resume <i_resume>`', and ':ref:`unreachable <i_unreachable>`'.
+':ref:`resume <i_resume>`', ':ref:`catchpad <i_catchpad>`',
+':ref:`catchendpad <i_catchendpad>`',
+':ref:`catchret <i_catchret>`',
+':ref:`cleanupret <i_cleanupret>`',
+':ref:`terminatepad <i_terminatepad>`',
+and ':ref:`unreachable <i_unreachable>`'.
 
 .. _i_ret:
 
 '``ret``' Instruction
 ^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""

 
 Example:
 """"""""
 
 .. code-block:: llvm
 
       resume { i8*, i32 } %exn
 
+.. _i_catchpad:
+
+'``catchpad``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      <resultval> = catchpad <resultty> [<args>*]
+          to label <normal label> unwind label <exception label>
+
+Overview:
+"""""""""
+
+The '``catchpad``' instruction is used by `LLVM's exception handling
+system <ExceptionHandling.html#overview>`_ to specify that a basic block
+is a catch block --- one where a personality routine attempts to transfer
+control to catch an exception.
+The ``args`` correspond to whatever information the personality
+routine requires to know if this is an appropriate place to catch the
+exception.  Control is tranfered to the ``exception`` label if the
+``catchpad`` is not an appropriate handler for the in-flight exception.
+The ``normal`` label should contain the code found in the ``catch``
+portion of a ``try``/``catch`` sequence. It defines values supplied by
+the :ref:`personality function <personalityfn>` upon re-entry to the
+function. The ``resultval`` has the type ``resultty``.
+
+Arguments:
+""""""""""
+
+The instruction takes a list of arbitrary values which are interpreted
+by the :ref:`personality function <personalityfn>`.
+
+The ``catchpad`` must be provided a ``normal`` label to transfer control
+to if the ``catchpad`` matches the exception and an ``exception``
+label to transfer control to if it doesn't.
+
+Semantics:
+""""""""""
+
+The '``catchpad``' instruction defines the values which are set by the
+:ref:`personality function <personalityfn>` upon re-entry to the function, and
+therefore the "result type" of the ``catchpad`` instruction. As with
+calling conventions, how the personality function results are
+represented in LLVM IR is target specific.
+
+When the call stack is being unwound due to an exception being thrown,
+the exception is compared against the ``args``. If it doesn't match,
+then control is transfered to the ``exception`` basic block.
+
+The ``catchpad`` instruction has several restrictions:
+
+-  A catch block is a basic block which is the unwind destination of
+   an exceptional instruction.
+-  A catch block must have a '``catchpad``' instruction as its
+   first non-PHI instruction.
+-  A catch block's ``exception`` edge must refer to a catch block or a
+   catch-end block.
+-  There can be only one '``catchpad``' instruction within the
+   catch block.
+-  A basic block that is not a catch block may not include a
+   '``catchpad``' instruction.
+-  It is undefined behavior for control to transfer from a ``catchpad`` to a
+   ``cleanupret`` without first executing a ``catchret`` and a subsequent
+   ``cleanuppad``.
+-  It is undefined behavior for control to transfer from a ``catchpad`` to a
+   ``ret`` without first executing a ``catchret``.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      ;; A catch block which can catch an integer.
+      %res = catchpad { i8*, i32 } [i8** @_ZTIi]
+        to label %int.handler unwind label %terminate
+
+.. _i_catchendpad:
+
+'``catchendpad``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      catchendpad unwind label <nextaction>
+      catchendpad unwind to caller
+
+Overview:
+"""""""""
+
+The '``catchendpad``' instruction is used by `LLVM's exception handling
+system <ExceptionHandling.html#overview>`_ to communicate to the
+:ref:`personality function <personalityfn>` which invokes are associated
+with a chain of :ref:`catchpad <i_catchpad>` instructions.
+
+The ``nextaction`` label indicates where control should transfer to if
+none of the ``catchpad`` instructions are suitable for catching the
+in-flight exception.
+
+If a ``nextaction`` label is not present, the instruction unwinds out of
+its parent function.  The
+:ref:`personality function <personalityfn>` will continue processing
+exception handling actions in the caller.
+
+Arguments:
+""""""""""
+
+The instruction optionally takes a label, ``nextaction``, indicating
+where control should transfer to if none of the preceding
+``catchpad`` instructions are suitable for the in-flight exception.
+
+Semantics:
+""""""""""
+
+When the call stack is being unwound due to an exception being thrown
+and none of the constituent ``catchpad`` instructions match, then
+control is transfered to ``nextaction`` if it is present.  If it is not
+present, control is transfered to the caller.
+
+The ``catchendpad`` instruction has several restrictions:
+
+-  A catch-end block is a basic block which is the unwind destination of
+   an exceptional instruction.
+-  A catch-end block must have a '``catchendpad``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``catchendpad``' instruction within the
+   catch block.
+-  A basic block that is not a catch-end block may not include a
+   '``catchendpad``' instruction.
+-  Exactly one catch block may unwind to a ``catchendpad``.
+-  The unwind target of invokes between a ``catchpad`` and a
+   corresponding ``catchret`` must be its ``catchendpad``.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      catchendpad unwind label %terminate
+      catchendpad unwind to caller
+
+.. _i_catchret:
+
+'``catchret``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      catchret label <normal>
+
+Overview:
+"""""""""
+
+The '``catchret``' instruction is a terminator instruction that has a
+single successor.
+
+
+Arguments:
+""""""""""
+
+The '``catchret``' instruction requires one argument which specifies
+where control will transfer to next.
+
+Semantics:
+""""""""""
+
+The '``catchret``' instruction ends the existing (in-flight) exception
+whose unwinding was interrupted with a
+:ref:`catchpad <i_catchpad>` instruction.
+The :ref:`personality function <personalityfn>` gets a chance to execute
+arbitrary code to, for example, run a C++ destructor.
+Control then transfers to ``normal``.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      catchret label %continue
+
+.. _i_cleanupret:
+
+'``cleanupret``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      cleanupret <type> <value> unwind label <continue>
+      cleanupret <type> <value> unwind to caller
+
+Overview:
+"""""""""
+
+The '``cleanupret``' instruction is a terminator instruction that has
+an optional successor.
+
+
+Arguments:
+""""""""""
+
+The '``cleanupret``' instruction requires one argument, which must have the
+same type as the result of any '``cleanuppad``' instruction in the same
+function.  It also has an optional successor,  ``continue``.
+
+Semantics:
+""""""""""
+
+The '``cleanupret``' instruction indicates to the
+:ref:`personality function <personalityfn>` that one
+:ref:`cleanuppad <i_cleanuppad>` it transferred control to has ended.
+It transfers control to ``continue`` or unwinds out of the function.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      cleanupret void unwind to caller
+      cleanupret { i8*, i32 } %exn unwind label %continue
+
+.. _i_terminatepad:
+
+'``terminatepad``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      terminatepad [<args>*] unwind label <exception label>
+      terminatepad [<args>*] unwind to caller
+
+Overview:
+"""""""""
+
+The '``terminatepad``' instruction is used by `LLVM's exception handling
+system <ExceptionHandling.html#overview>`_ to specify that a basic block
+is a terminate block --- one where a personality routine may decide to
+terminate the program.
+The ``args`` correspond to whatever information the personality
+routine requires to know if this is an appropriate place to terminate the
+program.  Control is transferred to the ``exception`` label if the
+personality routine decides not to terminate the program for the
+in-flight exception.
+
+Arguments:
+""""""""""
+
+The instruction takes a list of arbitrary values which are interpreted
+by the :ref:`personality function <personalityfn>`.
+
+The ``terminatepad`` may be given an ``exception`` label to
+transfer control to if the in-flight exception matches the ``args``.
+
+Semantics:
+""""""""""
+
+When the call stack is being unwound due to an exception being thrown,
+the exception is compared against the ``args``. If it matches,
+then control is transfered to the ``exception`` basic block.  Otherwise,
+the program is terminated via personality-specific means.  Typically,
+the first argument to ``terminatepad`` specifies what function the
+personality should defer to in order to terminate the program.
+
+The ``terminatepad`` instruction has several restrictions:
+
+-  A terminate block is a basic block which is the unwind destination of
+   an exceptional instruction.
+-  A terminate block must have a '``terminatepad``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``terminatepad``' instruction within the
+   terminate block.
+-  A basic block that is not a terminate block may not include a
+   '``terminatepad``' instruction.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      ;; A terminate block which only permits integers.
+      terminatepad [i8** @_ZTIi] unwind label %continue
+
 .. _i_unreachable:
 
 '``unreachable``' Instruction
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""
 
.. code-block:: llvm
       ;; A landing pad that is a cleanup.
       %res = landingpad { i8*, i32 }
                cleanup
       ;; A landing pad which can catch an integer and can only throw a double.
       %res = landingpad { i8*, i32 }
                catch i8** @_ZTIi
                filter [1 x i8**] [@_ZTId]
 
+.. _i_cleanuppad:
+
+'``cleanuppad``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      <resultval> = cleanuppad <resultty> [<args>*]
+
+Overview:
+"""""""""
+
+The '``cleanuppad``' instruction is used by `LLVM's exception handling
+system <ExceptionHandling.html#overview>`_ to specify that a basic block
+is a cleanup block --- one where a personality routine attempts to
+transfer control to run cleanup actions.
+The ``args`` correspond to whatever additional
+information the :ref:`personality function <personalityfn>` requires to
+execute the cleanup.
+The ``resultval`` has the type ``resultty``.
+
+Arguments:
+""""""""""
+
+The instruction takes a list of arbitrary values which are interpreted
+by the :ref:`personality function <personalityfn>`.
+
+Semantics:
+""""""""""
+
+The '``cleanuppad``' instruction defines the values which are set by the
+:ref:`personality function <personalityfn>` upon re-entry to the function, and
+therefore the "result type" of the ``cleanuppad`` instruction. As with
+calling conventions, how the personality function results are
+represented in LLVM IR is target specific.
+
+When the call stack is being unwound due to an exception being thrown,
+the :ref:`personality function <personalityfn>` transfers control to the
+``cleanuppad`` with the aid of the personality-specific arguments.
+
+The ``cleanuppad`` instruction has several restrictions:
+
+-  A cleanup block is a basic block which is the unwind destination of
+   an exceptional instruction.
+-  A cleanup block must have a '``cleanuppad``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``cleanuppad``' instruction within the
+   cleanup block.
+-  A basic block that is not a cleanup block may not include a
+   '``cleanuppad``' instruction.
+-  It is undefined behavior for control to transfer from a ``cleanuppad`` to a
+   ``catchret`` without first executing a ``cleanupret`` and a subsequent
+   ``catchpad``.
+-  It is undefined behavior for control to transfer from a ``cleanuppad`` to a
+   ``ret`` without first executing a ``cleanupret``.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      %res = cleanuppad { i8*, i32 } [label %nextaction]
+
 .. _intrinsics:
 
 Intrinsic Functions
 ===================
 
 LLVM supports the notion of an "intrinsic function". These functions
 have well known names and semantics and are required to follow certain
 restrictions. Overall, these intrinsics represent an extension mechanism
 for the LLVM language that does not require changing all of the
 transformations in LLVM when adding to the language (or the bitcode
 reader/writer, the parser, etc...).
 

include/llvm-c/Core.h

typedef enum {
 
   /* Atomic operators */
   LLVMFence          = 55,
   LLVMAtomicCmpXchg  = 56,
   LLVMAtomicRMW      = 57,
 
   /* Exception Handling Operators */
   LLVMResume         = 58,
-  LLVMLandingPad     = 59
+  LLVMLandingPad     = 59,
+  LLVMCleanupRet     = 61,
+  LLVMCatchRet       = 62,
+  LLVMCatchPad     = 63,
+  LLVMTerminatePad = 64,
+  LLVMCleanupPad   = 65,
+  LLVMCatchEndPad  = 66
 
 } LLVMOpcode;
 
 typedef enum {
   LLVMVoidTypeKind,        /**< type with no size */
   LLVMHalfTypeKind,        /**< 16 bit floating point type */
   LLVMFloatTypeKind,       /**< 32 bit floating point type */
   LLVMDoubleTypeKind,      /**< 64 bit floating point type */
macro(Instruction)                      \
       macro(CmpInst)                        \
         macro(FCmpInst)                     \
         macro(ICmpInst)                     \
       macro(ExtractElementInst)             \
       macro(GetElementPtrInst)              \
       macro(InsertElementInst)              \
       macro(InsertValueInst)                \
       macro(LandingPadInst)                 \
+      macro(CleanupPadInst)               \
       macro(PHINode)                        \
       macro(SelectInst)                     \
       macro(ShuffleVectorInst)              \
       macro(StoreInst)                      \
       macro(TerminatorInst)                 \
         macro(BranchInst)                   \
         macro(IndirectBrInst)               \
         macro(InvokeInst)                   \
         macro(ReturnInst)                   \
         macro(SwitchInst)                   \
         macro(UnreachableInst)              \
         macro(ResumeInst)                   \
+        macro(CleanupReturnInst)            \
+        macro(CatchReturnInst)              \
+        macro(CatchPadInst)               \
+        macro(TerminatePadInst)           \
+        macro(CatchEndPadInst)            \
       macro(UnaryInstruction)               \
         macro(AllocaInst)                   \
         macro(CastInst)                     \
           macro(AddrSpaceCastInst)          \
           macro(BitCastInst)                \
           macro(FPExtInst)                  \
           macro(FPToSIInst)                 \
           macro(FPToUIInst)                 \

include/llvm/Bitcode/LLVMBitCodes.h

enum FunctionCodes {
     FUNC_CODE_INST_STOREATOMIC_OLD = 42, // STORE: [ptrty,ptr,val, align, vol
                                      //         ordering, synchscope]
     FUNC_CODE_INST_GEP         = 43, // GEP:  [inbounds, n x operands]
     FUNC_CODE_INST_STORE       = 44, // STORE: [ptrty,ptr,valty,val, align, vol]
     FUNC_CODE_INST_STOREATOMIC = 45, // STORE: [ptrty,ptr,val, align, vol
     FUNC_CODE_INST_CMPXCHG     = 46, // CMPXCHG: [ptrty,ptr,valty,cmp,new, align,
                                      //           vol,ordering,synchscope]
     FUNC_CODE_INST_LANDINGPAD  = 47, // LANDINGPAD: [ty,val,num,id0,val0...]
+    FUNC_CODE_INST_CLEANUPRET  = 48, // CLEANUPRET: [] or [val] or [bb#] or [val,bb#]
+    FUNC_CODE_INST_CATCHRET    = 49, // CATCHRET: [bb#]
+    FUNC_CODE_INST_CATCHPAD  = 50, // CATCHPAD: [ty,val,val,num,args...]
+    FUNC_CODE_INST_TERMINATEPAD = 51, // TERMINATEPAD: [bb#,num,args...]
+    FUNC_CODE_INST_CLEANUPPAD = 52, // CLEANUPPAD: [num,args...]
+    FUNC_CODE_INST_CATCHENDPAD = 53, // CATCHENDPAD: [] or [bb#]
   };
 
   enum UseListCodes {
     USELIST_CODE_DEFAULT = 1, // DEFAULT: [index..., value-id]
     USELIST_CODE_BB      = 2  // BB: [index..., bb-id]
   };
 
   enum AttributeKindCodes {

include/llvm/IR/BasicBlock.h

public:
   /// \brief Notify the BasicBlock that the predecessor \p Pred is no longer
   /// able to reach it.
   ///
   /// This is actually not used to update the Predecessor list, but is actually
   /// used to update the PHI nodes that reside in the block.  Note that this
   /// should be called while the predecessor still refers to this block.
   void removePredecessor(BasicBlock *Pred, bool DontDeleteUselessPHIs = false);
 
+  bool isSplittable() const;
+
   /// \brief Split the basic block into two basic blocks at the specified
   /// instruction.
   ///
   /// Note that all instructions BEFORE the specified iterator stay as part of
   /// the original basic block, an unconditional branch is added to the original
   /// BB, and the rest of the instructions in the BB are moved to the new BB,
   /// including the old terminator.  The newly formed BasicBlock is returned.
   /// This function invalidates the specified iterator.
public:
   /// \brief Returns true if there are any uses of this basic block other than
   /// direct branches, switches, etc. to it.
   bool hasAddressTaken() const { return getSubclassDataFromValue() != 0; }
 
   /// \brief Update all phi nodes in this basic block's successors to refer to
   /// basic block \p New instead of to it.
   void replaceSuccessorsPhiUsesWith(BasicBlock *New);
 
+  /// \brief Return true if this basic block is an exception handling block.
+  bool isEHPad() const { return getFirstNonPHI()->isEHPad(); }
+
   /// \brief Return true if this basic block is a landing pad.
   ///
   /// Being a ``landing pad'' means that the basic block is the destination of
   /// the 'unwind' edge of an invoke instruction.
   bool isLandingPad() const;
 
   /// \brief Return the landingpad instruction associated with the landing pad.
   LandingPadInst *getLandingPadInst();

include/llvm/IR/IRBuilder.h

InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
     return Insert(InvokeInst::Create(Callee, NormalDest, UnwindDest, Args),
                   Name);
   }
 
   ResumeInst *CreateResume(Value *Exn) {
     return Insert(ResumeInst::Create(Exn));
   }
 
+  CleanupReturnInst *CreateCleanupRet(BasicBlock *UnwindBB = nullptr,
+                               Value *RetVal = nullptr) {
+    return Insert(CleanupReturnInst::Create(Context, RetVal, UnwindBB));
+  }
+
+  CatchPadInst *CreateCatchPad(Type *Ty, BasicBlock *NormalDest,
+                                   BasicBlock *UnwindDest,
+                                   ArrayRef<Value *> Args,
+                                   const Twine &Name = "") {
+    return Insert(CatchPadInst::Create(Ty, NormalDest, UnwindDest, Args),
+                  Name);
+  }
+
+  CatchEndPadInst *CreateCatchEndPad(BasicBlock *UnwindBB = nullptr) {
+    return Insert(CatchEndPadInst::Create(Context, UnwindBB));
+  }
+
+  TerminatePadInst *CreateTerminatePad(BasicBlock *UnwindBB = nullptr,
+                                           ArrayRef<Value *> Args = {},
+                                           const Twine &Name = "") {
+    return Insert(TerminatePadInst::Create(Context, UnwindBB, Args), Name);
+  }
+
+  CleanupPadInst *CreateCleanupPad(Type *Ty, ArrayRef<Value *> Args,
+                                       const Twine &Name = "") {
+    return Insert(CleanupPadInst::Create(Ty, Args), Name);
+  }
+
+  CatchReturnInst *CreateCatchRet(BasicBlock *BB) {
+    return Insert(CatchReturnInst::Create(BB));
+  }
+
   UnreachableInst *CreateUnreachable() {
     return Insert(new UnreachableInst(Context));
   }
 
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Binary Operators
   //===--------------------------------------------------------------------===//
 private:

include/llvm/IR/InstVisitor.h

#include "llvm/IR/Instruction.def"
   // necessary because we use the instruction classes as opaque types...
   //
   RetTy visitReturnInst(ReturnInst &I)            { DELEGATE(TerminatorInst);}
   RetTy visitBranchInst(BranchInst &I)            { DELEGATE(TerminatorInst);}
   RetTy visitSwitchInst(SwitchInst &I)            { DELEGATE(TerminatorInst);}
   RetTy visitIndirectBrInst(IndirectBrInst &I)    { DELEGATE(TerminatorInst);}
   RetTy visitResumeInst(ResumeInst &I)            { DELEGATE(TerminatorInst);}
   RetTy visitUnreachableInst(UnreachableInst &I)  { DELEGATE(TerminatorInst);}
+  RetTy visitCleanupReturnInst(CleanupReturnInst &I) { DELEGATE(TerminatorInst);}
+  RetTy visitCatchReturnInst(CatchReturnInst &I)  { DELEGATE(TerminatorInst);}
+  RetTy visitCatchPadInst(CatchPadInst &I)    { DELEGATE(TerminatorInst);}
+  RetTy visitCatchEndPadInst(CatchEndPadInst &I) { DELEGATE(TerminatorInst); }
+  RetTy visitTerminatePadInst(TerminatePadInst &I) { DELEGATE(TerminatorInst);}
   RetTy visitICmpInst(ICmpInst &I)                { DELEGATE(CmpInst);}
   RetTy visitFCmpInst(FCmpInst &I)                { DELEGATE(CmpInst);}
   RetTy visitAllocaInst(AllocaInst &I)            { DELEGATE(UnaryInstruction);}
   RetTy visitLoadInst(LoadInst     &I)            { DELEGATE(UnaryInstruction);}
   RetTy visitStoreInst(StoreInst   &I)            { DELEGATE(Instruction);}
   RetTy visitAtomicCmpXchgInst(AtomicCmpXchgInst &I) { DELEGATE(Instruction);}
   RetTy visitAtomicRMWInst(AtomicRMWInst &I)      { DELEGATE(Instruction);}
   RetTy visitFenceInst(FenceInst   &I)            { DELEGATE(Instruction);}
#include "llvm/IR/Instruction.def"
   RetTy visitSelectInst(SelectInst &I)            { DELEGATE(Instruction);}
   RetTy visitVAArgInst(VAArgInst   &I)            { DELEGATE(UnaryInstruction);}
   RetTy visitExtractElementInst(ExtractElementInst &I) { DELEGATE(Instruction);}
   RetTy visitInsertElementInst(InsertElementInst &I) { DELEGATE(Instruction);}
   RetTy visitShuffleVectorInst(ShuffleVectorInst &I) { DELEGATE(Instruction);}
   RetTy visitExtractValueInst(ExtractValueInst &I){ DELEGATE(UnaryInstruction);}
   RetTy visitInsertValueInst(InsertValueInst &I)  { DELEGATE(Instruction); }
   RetTy visitLandingPadInst(LandingPadInst &I)    { DELEGATE(Instruction); }
+  RetTy visitCleanupPadInst(CleanupPadInst &I) { DELEGATE(Instruction); }
 
   // Handle the special instrinsic instruction classes.
   RetTy visitDbgDeclareInst(DbgDeclareInst &I)    { DELEGATE(DbgInfoIntrinsic);}
   RetTy visitDbgValueInst(DbgValueInst &I)        { DELEGATE(DbgInfoIntrinsic);}
   RetTy visitDbgInfoIntrinsic(DbgInfoIntrinsic &I) { DELEGATE(IntrinsicInst); }
   RetTy visitMemSetInst(MemSetInst &I)            { DELEGATE(MemIntrinsic); }
   RetTy visitMemCpyInst(MemCpyInst &I)            { DELEGATE(MemTransferInst); }
   RetTy visitMemMoveInst(MemMoveInst &I)          { DELEGATE(MemTransferInst); }

include/llvm/IR/InstrTypes.h

public:
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const Instruction *I) {
     return I->isTerminator();
   }
   static inline bool classof(const Value *V) {
     return isa<Instruction>(V) && classof(cast<Instruction>(V));
   }
+
+  // \brief Returns true if this terminator relates to exception handling.
+  bool isExceptional() const {
+    switch (getOpcode()) {
+    case Instruction::CatchPad:
+    case Instruction::CatchEndPad:
+    case Instruction::CatchRet:
+    case Instruction::CleanupRet:
+    case Instruction::Invoke:
+    case Instruction::Resume:
+    case Instruction::TerminatePad:
+      return true;
+    default:
+      return false;
+    }
+  }
 };
 
 
 //===----------------------------------------------------------------------===//
 //                          UnaryInstruction Class
 //===----------------------------------------------------------------------===//
 
 class UnaryInstruction : public Instruction {

include/llvm/IR/Instruction.h

public:
   /// Note that this does not consider malloc and alloca to have side
   /// effects because the newly allocated memory is completely invisible to
   /// instructions which don't use the returned value.  For cases where this
   /// matters, isSafeToSpeculativelyExecute may be more appropriate.
   bool mayHaveSideEffects() const {
     return mayWriteToMemory() || mayThrow() || !mayReturn();
   }
 
+  /// \brief Return true if the instruction is a variety of EH-block.
+  bool isEHPad() const {
+    switch (getOpcode()) {
+    case Instruction::CatchPad:
+    case Instruction::CatchEndPad:
+    case Instruction::CleanupPad:
+    case Instruction::LandingPad:
+    case Instruction::TerminatePad:
+      return true;
+    default:
+      return false;
+    }
+  }
+
   /// clone() - Create a copy of 'this' instruction that is identical in all
   /// ways except the following:
   ///   * The instruction has no parent
   ///   * The instruction has no name
   ///
   Instruction *clone() const;
 
   /// isIdenticalTo - Return true if the specified instruction is exactly

include/llvm/IR/Instruction.def

 #endif
 
 
 // Terminator Instructions - These instructions are used to terminate a basic
 // block of the program.   Every basic block must end with one of these
 // instructions for it to be a well formed basic block.
 //
  FIRST_TERM_INST  ( 1)
-HANDLE_TERM_INST  ( 1, Ret        , ReturnInst)
-HANDLE_TERM_INST  ( 2, Br         , BranchInst)
-HANDLE_TERM_INST  ( 3, Switch     , SwitchInst)
-HANDLE_TERM_INST  ( 4, IndirectBr , IndirectBrInst)
-HANDLE_TERM_INST  ( 5, Invoke     , InvokeInst)
-HANDLE_TERM_INST  ( 6, Resume     , ResumeInst)
-HANDLE_TERM_INST  ( 7, Unreachable, UnreachableInst)
-  LAST_TERM_INST  ( 7)
+HANDLE_TERM_INST  ( 1, Ret           , ReturnInst)
+HANDLE_TERM_INST  ( 2, Br            , BranchInst)
+HANDLE_TERM_INST  ( 3, Switch        , SwitchInst)
+HANDLE_TERM_INST  ( 4, IndirectBr    , IndirectBrInst)
+HANDLE_TERM_INST  ( 5, Invoke        , InvokeInst)
+HANDLE_TERM_INST  ( 6, Resume        , ResumeInst)
+HANDLE_TERM_INST  ( 7, Unreachable   , UnreachableInst)
+HANDLE_TERM_INST  ( 8, CleanupRet    , CleanupReturnInst)
+HANDLE_TERM_INST  ( 9, CatchRet      , CatchReturnInst)
+HANDLE_TERM_INST  (10, CatchPad    , CatchPadInst)
+HANDLE_TERM_INST  (11, TerminatePad, TerminatePadInst)
+HANDLE_TERM_INST  (12, CatchEndPad , CatchEndPadInst)
+  LAST_TERM_INST  (12)
 
 // Standard binary operators...
- FIRST_BINARY_INST( 8)
-HANDLE_BINARY_INST( 8, Add  , BinaryOperator)
-HANDLE_BINARY_INST( 9, FAdd , BinaryOperator)
-HANDLE_BINARY_INST(10, Sub  , BinaryOperator)
-HANDLE_BINARY_INST(11, FSub , BinaryOperator)
-HANDLE_BINARY_INST(12, Mul  , BinaryOperator)
-HANDLE_BINARY_INST(13, FMul , BinaryOperator)
-HANDLE_BINARY_INST(14, UDiv , BinaryOperator)
-HANDLE_BINARY_INST(15, SDiv , BinaryOperator)
-HANDLE_BINARY_INST(16, FDiv , BinaryOperator)
-HANDLE_BINARY_INST(17, URem , BinaryOperator)
-HANDLE_BINARY_INST(18, SRem , BinaryOperator)
-HANDLE_BINARY_INST(19, FRem , BinaryOperator)
+ FIRST_BINARY_INST(13)
+HANDLE_BINARY_INST(13, Add  , BinaryOperator)
+HANDLE_BINARY_INST(14, FAdd , BinaryOperator)
+HANDLE_BINARY_INST(15, Sub  , BinaryOperator)
+HANDLE_BINARY_INST(16, FSub , BinaryOperator)
+HANDLE_BINARY_INST(17, Mul  , BinaryOperator)
+HANDLE_BINARY_INST(18, FMul , BinaryOperator)
+HANDLE_BINARY_INST(19, UDiv , BinaryOperator)
+HANDLE_BINARY_INST(20, SDiv , BinaryOperator)
+HANDLE_BINARY_INST(21, FDiv , BinaryOperator)
+HANDLE_BINARY_INST(22, URem , BinaryOperator)
+HANDLE_BINARY_INST(23, SRem , BinaryOperator)
+HANDLE_BINARY_INST(24, FRem , BinaryOperator)
 
 // Logical operators (integer operands)
-HANDLE_BINARY_INST(20, Shl  , BinaryOperator) // Shift left  (logical)
-HANDLE_BINARY_INST(21, LShr , BinaryOperator) // Shift right (logical)
-HANDLE_BINARY_INST(22, AShr , BinaryOperator) // Shift right (arithmetic)
-HANDLE_BINARY_INST(23, And  , BinaryOperator)
-HANDLE_BINARY_INST(24, Or   , BinaryOperator)
-HANDLE_BINARY_INST(25, Xor  , BinaryOperator)
-  LAST_BINARY_INST(25)
+HANDLE_BINARY_INST(25, Shl  , BinaryOperator) // Shift left  (logical)
+HANDLE_BINARY_INST(26, LShr , BinaryOperator) // Shift right (logical)
+HANDLE_BINARY_INST(27, AShr , BinaryOperator) // Shift right (arithmetic)
+HANDLE_BINARY_INST(28, And  , BinaryOperator)
+HANDLE_BINARY_INST(29, Or   , BinaryOperator)
+HANDLE_BINARY_INST(30, Xor  , BinaryOperator)
+  LAST_BINARY_INST(30)
 
 // Memory operators...
- FIRST_MEMORY_INST(26)
-HANDLE_MEMORY_INST(26, Alloca, AllocaInst)  // Stack management
-HANDLE_MEMORY_INST(27, Load  , LoadInst  )  // Memory manipulation instrs
-HANDLE_MEMORY_INST(28, Store , StoreInst )
-HANDLE_MEMORY_INST(29, GetElementPtr, GetElementPtrInst)
-HANDLE_MEMORY_INST(30, Fence , FenceInst )
-HANDLE_MEMORY_INST(31, AtomicCmpXchg , AtomicCmpXchgInst )
-HANDLE_MEMORY_INST(32, AtomicRMW , AtomicRMWInst )
-  LAST_MEMORY_INST(32)
+ FIRST_MEMORY_INST(31)
+HANDLE_MEMORY_INST(31, Alloca, AllocaInst)  // Stack management
+HANDLE_MEMORY_INST(32, Load  , LoadInst  )  // Memory manipulation instrs
+HANDLE_MEMORY_INST(33, Store , StoreInst )
+HANDLE_MEMORY_INST(34, GetElementPtr, GetElementPtrInst)
+HANDLE_MEMORY_INST(35, Fence , FenceInst )
+HANDLE_MEMORY_INST(36, AtomicCmpXchg , AtomicCmpXchgInst )
+HANDLE_MEMORY_INST(37, AtomicRMW , AtomicRMWInst )
+  LAST_MEMORY_INST(37)
 
 // Cast operators ...
 // NOTE: The order matters here because CastInst::isEliminableCastPair 
 // NOTE: (see Instructions.cpp) encodes a table based on this ordering.
- FIRST_CAST_INST(33)
-HANDLE_CAST_INST(33, Trunc   , TruncInst   )  // Truncate integers
-HANDLE_CAST_INST(34, ZExt    , ZExtInst    )  // Zero extend integers
-HANDLE_CAST_INST(35, SExt    , SExtInst    )  // Sign extend integers
-HANDLE_CAST_INST(36, FPToUI  , FPToUIInst  )  // floating point -> UInt
-HANDLE_CAST_INST(37, FPToSI  , FPToSIInst  )  // floating point -> SInt
-HANDLE_CAST_INST(38, UIToFP  , UIToFPInst  )  // UInt -> floating point
-HANDLE_CAST_INST(39, SIToFP  , SIToFPInst  )  // SInt -> floating point
-HANDLE_CAST_INST(40, FPTrunc , FPTruncInst )  // Truncate floating point
-HANDLE_CAST_INST(41, FPExt   , FPExtInst   )  // Extend floating point
-HANDLE_CAST_INST(42, PtrToInt, PtrToIntInst)  // Pointer -> Integer
-HANDLE_CAST_INST(43, IntToPtr, IntToPtrInst)  // Integer -> Pointer
-HANDLE_CAST_INST(44, BitCast , BitCastInst )  // Type cast
-HANDLE_CAST_INST(45, AddrSpaceCast, AddrSpaceCastInst)  // addrspace cast
-  LAST_CAST_INST(45)
+ FIRST_CAST_INST(38)
+HANDLE_CAST_INST(38, Trunc   , TruncInst   )  // Truncate integers
+HANDLE_CAST_INST(39, ZExt    , ZExtInst    )  // Zero extend integers
+HANDLE_CAST_INST(40, SExt    , SExtInst    )  // Sign extend integers
+HANDLE_CAST_INST(41, FPToUI  , FPToUIInst  )  // floating point -> UInt
+HANDLE_CAST_INST(42, FPToSI  , FPToSIInst  )  // floating point -> SInt
+HANDLE_CAST_INST(43, UIToFP  , UIToFPInst  )  // UInt -> floating point
+HANDLE_CAST_INST(44, SIToFP  , SIToFPInst  )  // SInt -> floating point
+HANDLE_CAST_INST(45, FPTrunc , FPTruncInst )  // Truncate floating point
+HANDLE_CAST_INST(46, FPExt   , FPExtInst   )  // Extend floating point
+HANDLE_CAST_INST(47, PtrToInt, PtrToIntInst)  // Pointer -> Integer
+HANDLE_CAST_INST(48, IntToPtr, IntToPtrInst)  // Integer -> Pointer
+HANDLE_CAST_INST(49, BitCast , BitCastInst )  // Type cast
+HANDLE_CAST_INST(50, AddrSpaceCast, AddrSpaceCastInst)  // addrspace cast
+  LAST_CAST_INST(50)
 
 // Other operators...
- FIRST_OTHER_INST(46)
-HANDLE_OTHER_INST(46, ICmp   , ICmpInst   )  // Integer comparison instruction
-HANDLE_OTHER_INST(47, FCmp   , FCmpInst   )  // Floating point comparison instr.
-HANDLE_OTHER_INST(48, PHI    , PHINode    )  // PHI node instruction
-HANDLE_OTHER_INST(49, Call   , CallInst   )  // Call a function
-HANDLE_OTHER_INST(50, Select , SelectInst )  // select instruction
-HANDLE_OTHER_INST(51, UserOp1, Instruction)  // May be used internally in a pass
-HANDLE_OTHER_INST(52, UserOp2, Instruction)  // Internal to passes only
-HANDLE_OTHER_INST(53, VAArg  , VAArgInst  )  // vaarg instruction
-HANDLE_OTHER_INST(54, ExtractElement, ExtractElementInst)// extract from vector
-HANDLE_OTHER_INST(55, InsertElement, InsertElementInst)  // insert into vector
-HANDLE_OTHER_INST(56, ShuffleVector, ShuffleVectorInst)  // shuffle two vectors.
-HANDLE_OTHER_INST(57, ExtractValue, ExtractValueInst)// extract from aggregate
-HANDLE_OTHER_INST(58, InsertValue, InsertValueInst)  // insert into aggregate
-HANDLE_OTHER_INST(59, LandingPad, LandingPadInst)  // Landing pad instruction.
-  LAST_OTHER_INST(59)
+ FIRST_OTHER_INST(51)
+HANDLE_OTHER_INST(51, ICmp   , ICmpInst   )  // Integer comparison instruction
+HANDLE_OTHER_INST(52, FCmp   , FCmpInst   )  // Floating point comparison instr.
+HANDLE_OTHER_INST(53, PHI    , PHINode    )  // PHI node instruction
+HANDLE_OTHER_INST(54, Call   , CallInst   )  // Call a function
+HANDLE_OTHER_INST(55, Select , SelectInst )  // select instruction
+HANDLE_OTHER_INST(56, UserOp1, Instruction)  // May be used internally in a pass
+HANDLE_OTHER_INST(57, UserOp2, Instruction)  // Internal to passes only
+HANDLE_OTHER_INST(58, VAArg  , VAArgInst  )  // vaarg instruction
+HANDLE_OTHER_INST(59, ExtractElement, ExtractElementInst)// extract from vector
+HANDLE_OTHER_INST(60, InsertElement, InsertElementInst)  // insert into vector
+HANDLE_OTHER_INST(61, ShuffleVector, ShuffleVectorInst)  // shuffle two vectors.
+HANDLE_OTHER_INST(62, ExtractValue, ExtractValueInst)// extract from aggregate
+HANDLE_OTHER_INST(63, InsertValue, InsertValueInst)  // insert into aggregate
+HANDLE_OTHER_INST(64, LandingPad, LandingPadInst)  // Landing pad instruction.
+HANDLE_OTHER_INST(65, CleanupPad, CleanupPadInst)
+  LAST_OTHER_INST(65)
 
 #undef  FIRST_TERM_INST
 #undef HANDLE_TERM_INST
 #undef   LAST_TERM_INST
 
 #undef  FIRST_BINARY_INST
 #undef HANDLE_BINARY_INST
 #undef   LAST_BINARY_INST

include/llvm/IR/Instructions.h

 template <>
 struct OperandTraits<ResumeInst> :
     public FixedNumOperandTraits<ResumeInst, 1> {
 };
 
 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ResumeInst, Value)
 
 //===----------------------------------------------------------------------===//
+//                               CleanupReturnInst Class
+//===----------------------------------------------------------------------===//
+
+class CleanupReturnInst : public TerminatorInst {
+  CleanupReturnInst(const CleanupReturnInst &RI);
+
+private:
+  void init(Value *RetVal, BasicBlock *UnwindBB);
+  CleanupReturnInst(LLVMContext &C, Value *RetVal, BasicBlock *UnwindBB,
+                    unsigned Values, Instruction *InsertBefore = nullptr);
+  CleanupReturnInst(LLVMContext &C, Value *RetVal, BasicBlock *UnwindBB,
+                    unsigned Values, BasicBlock *InsertAtEnd);
+
+  int getUnwindLabelOpIdx() const {
+    assert(hasUnwindDest());
+    return 0;
+  }
+
+  int getRetValOpIdx() const {
+    assert(hasReturnValue());
+    if (hasUnwindDest())
+      return 1;
+    return 0;
+  }
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  CleanupReturnInst *cloneImpl() const;
+
+public:
+  static CleanupReturnInst *Create(LLVMContext &C,
+                                   Value *RetVal = nullptr,
+                                   BasicBlock *UnwindBB = nullptr,
+                                   Instruction *InsertBefore = nullptr) {
+    unsigned Values = 0;
+    if (RetVal)
+      ++Values;
+    if (UnwindBB)
+      ++Values;
+    return new (Values)
+        CleanupReturnInst(C, RetVal, UnwindBB, Values, InsertBefore);
+  }
+  static CleanupReturnInst *Create(LLVMContext &C, Value *RetVal,
+                                   BasicBlock *UnwindBB,
+                                   BasicBlock *InsertAtEnd) {
+    unsigned Values = 0;
+    if (RetVal)
+      ++Values;
+    if (UnwindBB)
+      ++Values;
+    return new (Values)
+        CleanupReturnInst(C, RetVal, UnwindBB, Values, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  bool hasUnwindDest() const { return getSubclassDataFromInstruction() & 1; }
+  bool unwindsToCaller() const { return !hasUnwindDest(); }
+  bool hasReturnValue() const { return getSubclassDataFromInstruction() & 2; }
+
+  /// Convenience accessor. Returns null if there is no return value.
+  Value *getReturnValue() const {
+    if (!hasReturnValue())
+      return nullptr;
+    return getOperand(getRetValOpIdx());
+  }
+  void setReturnValue(Value *RetVal) {
+    assert(hasReturnValue());
+    setOperand(getRetValOpIdx(), RetVal);
+  }
+
+  unsigned getNumSuccessors() const { return hasUnwindDest() ? 1 : 0; }
+
+  BasicBlock *getUnwindDest() const;
+  void setUnwindDest(BasicBlock *NewDest);
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const Instruction *I) {
+    return (I->getOpcode() == Instruction::CleanupRet);
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+
+private:
+  BasicBlock *getSuccessorV(unsigned Idx) const override;
+  unsigned getNumSuccessorsV() const override;
+  void setSuccessorV(unsigned Idx, BasicBlock *B) override;
+
+  // Shadow Instruction::setInstructionSubclassData with a private forwarding
+  // method so that subclasses cannot accidentally use it.
+  void setInstructionSubclassData(unsigned short D) {
+    Instruction::setInstructionSubclassData(D);
+  }
+};
+
+template <>
+struct OperandTraits<CleanupReturnInst>
+    : public VariadicOperandTraits<CleanupReturnInst> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CleanupReturnInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                               CatchEndPadInst Class
+//===----------------------------------------------------------------------===//
+
+class CatchEndPadInst : public TerminatorInst {
+  CatchEndPadInst(const CatchEndPadInst &RI);
+
+private:
+  void init(BasicBlock *UnwindBB);
+  CatchEndPadInst(LLVMContext &C, BasicBlock *UnwindBB, unsigned Values,
+                    Instruction *InsertBefore = nullptr);
+  CatchEndPadInst(LLVMContext &C, BasicBlock *UnwindBB, unsigned Values,
+                    BasicBlock *InsertAtEnd);
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  CatchEndPadInst *cloneImpl() const;
+
+public:
+  static CatchEndPadInst *Create(LLVMContext &C,
+                                   BasicBlock *UnwindBB = nullptr,
+                                   Instruction *InsertBefore = nullptr) {
+    unsigned Values = UnwindBB ? 1 : 0;
+    return new (Values) CatchEndPadInst(C, UnwindBB, Values, InsertBefore);
+  }
+  static CatchEndPadInst *Create(LLVMContext &C, BasicBlock *UnwindBB,
+                                   BasicBlock *InsertAtEnd) {
+    unsigned Values = UnwindBB ? 1 : 0;
+    return new (Values) CatchEndPadInst(C, UnwindBB, Values, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  bool hasUnwindDest() const { return getSubclassDataFromInstruction() & 1; }
+  bool unwindsToCaller() const { return !hasUnwindDest(); }
+
+  /// Convenience accessor. Returns null if there is no return value.
+  unsigned getNumSuccessors() const { return hasUnwindDest() ? 1 : 0; }
+
+  BasicBlock *getUnwindDest() const {
+    return hasUnwindDest() ? cast<BasicBlock>(Op<-1>()) : nullptr;
+  }
+  void setUnwindDest(BasicBlock *NewDest) {
+    assert(NewDest);
+    Op<-1>() = NewDest;
+  }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const Instruction *I) {
+    return (I->getOpcode() == Instruction::CatchEndPad);
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+
+private:
+  BasicBlock *getSuccessorV(unsigned Idx) const override;
+  unsigned getNumSuccessorsV() const override;
+  void setSuccessorV(unsigned Idx, BasicBlock *B) override;
+
+private:
+  // Shadow Instruction::setInstructionSubclassData with a private forwarding
+  // method so that subclasses cannot accidentally use it.
+  void setInstructionSubclassData(unsigned short D) {
+    Instruction::setInstructionSubclassData(D);
+  }
+};
+
+template <>
+struct OperandTraits<CatchEndPadInst>
+    : public VariadicOperandTraits<CatchEndPadInst> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CatchEndPadInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                           CatchPadInst Class
+//===----------------------------------------------------------------------===//
+
+class CatchPadInst : public TerminatorInst {
+private:
+  void init(BasicBlock *IfNormal, BasicBlock *IfException,
+            ArrayRef<Value *> Args, const Twine &NameStr);
+
+  CatchPadInst(const CatchPadInst &CPI);
+
+  explicit CatchPadInst(Type *RetTy, BasicBlock *IfNormal,
+                          BasicBlock *IfException, ArrayRef<Value *> Args,
+                          unsigned Values, const Twine &NameStr,
+                          Instruction *InsertBefore);
+  explicit CatchPadInst(Type *RetTy, BasicBlock *IfNormal,
+                          BasicBlock *IfException, ArrayRef<Value *> Args,
+                          unsigned Values, const Twine &NameStr,
+                          BasicBlock *InsertAtEnd);
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  CatchPadInst *cloneImpl() const;
+
+public:
+  static CatchPadInst *Create(Type *RetTy, BasicBlock *IfNormal,
+                                BasicBlock *IfException, ArrayRef<Value *> Args,
+                                const Twine &NameStr = "",
+                                Instruction *InsertBefore = nullptr) {
+    unsigned Values = unsigned(Args.size()) + 2;
+    return new (Values) CatchPadInst(RetTy, IfNormal, IfException, Args,
+                                       Values, NameStr, InsertBefore);
+  }
+  static CatchPadInst *Create(Type *RetTy, BasicBlock *IfNormal,
+                                BasicBlock *IfException, ArrayRef<Value *> Args,
+                                const Twine &NameStr, BasicBlock *InsertAtEnd) {
+    unsigned Values = unsigned(Args.size()) + 2;
+    return new (Values) CatchPadInst(RetTy, IfNormal, IfException, Args,
+                                       Values, NameStr, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  /// getNumArgOperands - Return the number of catchpad arguments.
+  ///
+  unsigned getNumArgOperands() const { return getNumOperands() - 2; }
+
+  /// getArgOperand/setArgOperand - Return/set the i-th catchpad argument.
+  ///
+  Value *getArgOperand(unsigned i) const { return getOperand(i); }
+  void setArgOperand(unsigned i, Value *v) { setOperand(i, v); }
+
+  /// arg_operands - iteration adapter for range-for loops.
+  iterator_range<op_iterator> arg_operands() {
+    return iterator_range<op_iterator>(op_begin(), op_end() - 2);
+  }
+
+  /// arg_operands - iteration adapter for range-for loops.
+  iterator_range<const_op_iterator> arg_operands() const {
+    return iterator_range<const_op_iterator>(op_begin(), op_end() - 2);
+  }
+
+  /// \brief Wrappers for getting the \c Use of a catchpad argument.
+  const Use &getArgOperandUse(unsigned i) const { return getOperandUse(i); }
+  Use &getArgOperandUse(unsigned i) { return getOperandUse(i); }
+
+  // get*Dest - Return the destination basic blocks...
+  BasicBlock *getNormalDest() const { return cast<BasicBlock>(Op<-2>()); }
+  BasicBlock *getUnwindDest() const { return cast<BasicBlock>(Op<-1>()); }
+  void setNormalDest(BasicBlock *B) { Op<-2>() = reinterpret_cast<Value *>(B); }
+  void setUnwindDest(BasicBlock *B) { Op<-1>() = reinterpret_cast<Value *>(B); }
+
+  BasicBlock *getSuccessor(unsigned i) const {
+    assert(i < 2 && "Successor # out of range for catchpad!");
+    return i == 0 ? getNormalDest() : getUnwindDest();
+  }
+
+  void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
+    assert(idx < 2 && "Successor # out of range for catchpad!");
+    *(&Op<-2>() + idx) = reinterpret_cast<Value *>(NewSucc);
+  }
+
+  unsigned getNumSuccessors() const { return 2; }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::CatchPad;
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+
+private:
+  BasicBlock *getSuccessorV(unsigned idx) const override;
+  unsigned getNumSuccessorsV() const override;
+  void setSuccessorV(unsigned idx, BasicBlock *B) override;
+};
+
+template <>
+struct OperandTraits<CatchPadInst>
+    : public VariadicOperandTraits<CatchPadInst, /*MINARITY=*/2> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CatchPadInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                           TerminatePadInst Class
+//===----------------------------------------------------------------------===//
+
+class TerminatePadInst : public TerminatorInst {
+private:
+  void init(BasicBlock *BB, ArrayRef<Value *> Args, const Twine &NameStr);
+
+  TerminatePadInst(const TerminatePadInst &TPI);
+
+  explicit TerminatePadInst(LLVMContext &C, BasicBlock *BB,
+                              ArrayRef<Value *> Args, unsigned Values,
+                              const Twine &NameStr, Instruction *InsertBefore);
+  explicit TerminatePadInst(LLVMContext &C, BasicBlock *BB,
+                              ArrayRef<Value *> Args, unsigned Values,
+                              const Twine &NameStr, BasicBlock *InsertAtEnd);
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  TerminatePadInst *cloneImpl() const;
+
+public:
+  static TerminatePadInst *Create(LLVMContext &C, BasicBlock *BB = nullptr,
+                                    ArrayRef<Value *> Args = {},
+                                    const Twine &NameStr = "",
+                                    Instruction *InsertBefore = nullptr) {
+    unsigned Values = unsigned(Args.size());
+    if (BB)
+      ++Values;
+    return new (Values)
+        TerminatePadInst(C, BB, Args, Values, NameStr, InsertBefore);
+  }
+  static TerminatePadInst *Create(LLVMContext &C, BasicBlock *BB,
+                                    ArrayRef<Value *> Args,
+                                    const Twine &NameStr,
+                                    BasicBlock *InsertAtEnd) {
+    unsigned Values = unsigned(Args.size());
+    if (BB)
+      ++Values;
+    return new (Values)
+        TerminatePadInst(C, BB, Args, Values, NameStr, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  bool hasUnwindDest() const { return getSubclassDataFromInstruction() & 1; }
+  bool unwindsToCaller() const { return !hasUnwindDest(); }
+
+  /// getNumArgOperands - Return the number of terminatepad arguments.
+  ///
+  unsigned getNumArgOperands() const {
+    unsigned NumOperands = getNumOperands();
+    if (hasUnwindDest())
+      return NumOperands - 1;
+    return NumOperands;
+  }
+
+  /// getArgOperand/setArgOperand - Return/set the i-th terminatepad argument.
+  ///
+  Value *getArgOperand(unsigned i) const { return getOperand(i); }
+  void setArgOperand(unsigned i, Value *v) { setOperand(i, v); }
+
+  const_op_iterator arg_end() const {
+    if (hasUnwindDest())
+      return op_end() - 1;
+    return op_end();
+  }
+
+  op_iterator arg_end() {
+    if (hasUnwindDest())
+      return op_end() - 1;
+    return op_end();
+  }
+
+  /// arg_operands - iteration adapter for range-for loops.
+  iterator_range<op_iterator> arg_operands() {
+    return iterator_range<op_iterator>(op_begin(), arg_end());
+  }
+
+  /// arg_operands - iteration adapter for range-for loops.
+  iterator_range<const_op_iterator> arg_operands() const {
+    return iterator_range<const_op_iterator>(op_begin(), arg_end());
+  }
+
+  /// \brief Wrappers for getting the \c Use of a terminatepad argument.
+  const Use &getArgOperandUse(unsigned i) const { return getOperandUse(i); }
+  Use &getArgOperandUse(unsigned i) { return getOperandUse(i); }
+
+  // get*Dest - Return the destination basic blocks...
+  BasicBlock *getUnwindDest() const {
+    if (!hasUnwindDest())
+      return nullptr;
+    return cast<BasicBlock>(Op<-1>());
+  }
+  void setUnwindDest(BasicBlock *B) {
+    assert(B && hasUnwindDest());
+    Op<-1>() = reinterpret_cast<Value *>(B);
+  }
+
+  unsigned getNumSuccessors() const { return hasUnwindDest() ? 1 : 0; }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::TerminatePad;
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+
+private:
+  BasicBlock *getSuccessorV(unsigned idx) const override;
+  unsigned getNumSuccessorsV() const override;
+  void setSuccessorV(unsigned idx, BasicBlock *B) override;
+
+  // Shadow Instruction::setInstructionSubclassData with a private forwarding
+  // method so that subclasses cannot accidentally use it.
+  void setInstructionSubclassData(unsigned short D) {
+    Instruction::setInstructionSubclassData(D);
+  }
+};
+
+template <>
+struct OperandTraits<TerminatePadInst>
+    : public VariadicOperandTraits<TerminatePadInst, /*MINARITY=*/1> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(TerminatePadInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                           CleanupPadInst Class
+//===----------------------------------------------------------------------===//
+
+class CleanupPadInst : public Instruction {
+private:
+  void init(ArrayRef<Value *> Args, const Twine &NameStr);
+
+  CleanupPadInst(const CleanupPadInst &CPI);
+
+  explicit CleanupPadInst(Type *RetTy, ArrayRef<Value *> Args,
+                            const Twine &NameStr, Instruction *InsertBefore);
+  explicit CleanupPadInst(Type *RetTy, ArrayRef<Value *> Args,
+                            const Twine &NameStr, BasicBlock *InsertAtEnd);
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  CleanupPadInst *cloneImpl() const;
+
+public:
+  static CleanupPadInst *Create(Type *RetTy, ArrayRef<Value *> Args,
+                                  const Twine &NameStr = "",
+                                  Instruction *InsertBefore = nullptr) {
+    return new (Args.size())
+        CleanupPadInst(RetTy, Args, NameStr, InsertBefore);
+  }
+  static CleanupPadInst *Create(Type *RetTy, ArrayRef<Value *> Args,
+                                  const Twine &NameStr,
+                                  BasicBlock *InsertAtEnd) {
+    return new (Args.size())
+        CleanupPadInst(RetTy, Args, NameStr, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::CleanupPad;
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+};
+
+template <>
+struct OperandTraits<CleanupPadInst>
+    : public VariadicOperandTraits<CleanupPadInst, /*MINARITY=*/0> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CleanupPadInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                               CatchReturnInst Class
+//===----------------------------------------------------------------------===//
+
+class CatchReturnInst : public TerminatorInst {
+  CatchReturnInst(const CatchReturnInst &RI);
+
+private:
+  void init(Value *RetVal, BasicBlock *UnwindBB);
+  CatchReturnInst(BasicBlock *BB, Instruction *InsertBefore = nullptr);
+  CatchReturnInst(BasicBlock *BB, BasicBlock *InsertAtEnd);
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  CatchReturnInst *cloneImpl() const;
+
+public:
+  static CatchReturnInst *Create(BasicBlock *BB,
+                                 Instruction *InsertBefore = nullptr) {
+    return new (1) CatchReturnInst(BB, InsertBefore);
+  }
+  static CatchReturnInst *Create(BasicBlock *BB, BasicBlock *InsertAtEnd) {
+    return new (1) CatchReturnInst(BB, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  /// Convenience accessors.
+  BasicBlock *getSuccessor() const { return cast<BasicBlock>(Op<0>()); }
+  void setSuccessor(BasicBlock *NewSucc) { Op<0>() = (Value *)NewSucc; }
+  unsigned getNumSuccessors() const { return 1; }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const Instruction *I) {
+    return (I->getOpcode() == Instruction::CatchRet);
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+
+private:
+  BasicBlock *getSuccessorV(unsigned Idx) const override;
+  unsigned getNumSuccessorsV() const override;
+  void setSuccessorV(unsigned Idx, BasicBlock *B) override;
+};
+
+template <>
+struct OperandTraits<CatchReturnInst>
+    : public FixedNumOperandTraits<CatchReturnInst, /*ARITY=*/1> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CatchReturnInst, Value)
+
+//===----------------------------------------------------------------------===//
 //                           UnreachableInst Class
 //===----------------------------------------------------------------------===//
 
 //===---------------------------------------------------------------------------
 /// UnreachableInst - This function has undefined behavior.  In particular, the
 /// presence of this instruction indicates some higher level knowledge that the
 /// end of the block cannot be reached.
 ///

lib/Analysis/IPA/InlineCost.cpp

class CallAnalyzer : public InstVisitor<CallAnalyzer, bool> {
   bool visitExtractValue(ExtractValueInst &I);
   bool visitInsertValue(InsertValueInst &I);
   bool visitCallSite(CallSite CS);
   bool visitReturnInst(ReturnInst &RI);
   bool visitBranchInst(BranchInst &BI);
   bool visitSwitchInst(SwitchInst &SI);
   bool visitIndirectBrInst(IndirectBrInst &IBI);
   bool visitResumeInst(ResumeInst &RI);
+  bool visitCleanupReturnInst(CleanupReturnInst &RI);
+  bool visitCatchReturnInst(CatchReturnInst &RI);
   bool visitUnreachableInst(UnreachableInst &I);
 
 public:
   CallAnalyzer(const TargetTransformInfo &TTI, AssumptionCacheTracker *ACT,
                Function &Callee, int Threshold, CallSite CSArg)
     : TTI(TTI), ACT(ACT), F(Callee), CandidateCS(CSArg), Threshold(Threshold),
         Cost(0), IsCallerRecursive(false), IsRecursiveCall(false),
         ExposesReturnsTwice(false), HasDynamicAlloca(false),

 }
 
 bool CallAnalyzer::visitResumeInst(ResumeInst &RI) {
   // FIXME: It's not clear that a single instruction is an accurate model for
   // the inline cost of a resume instruction.
   return false;
 }
 
+bool CallAnalyzer::visitCleanupReturnInst(CleanupReturnInst &CRI) {
+  // FIXME: It's not clear that a single instruction is an accurate model for
+  // the inline cost of a cleanupret instruction.
+  return false;
+}
+
+bool CallAnalyzer::visitCatchReturnInst(CatchReturnInst &CRI) {
+  // FIXME: It's not clear that a single instruction is an accurate model for
+  // the inline cost of a cleanupret instruction.
+  return false;
+}
+
 bool CallAnalyzer::visitUnreachableInst(UnreachableInst &I) {
   // FIXME: It might be reasonably to discount the cost of instructions leading
   // to unreachable as they have the lowest possible impact on both runtime and
   // code size.
   return true; // No actual code is needed for unreachable.
 }
 
 bool CallAnalyzer::visitInstruction(Instruction &I) {

lib/Analysis/LoopInfo.cpp

bool Loop::makeLoopInvariant(Instruction *I, bool &Changed,
                              Instruction *InsertPt) const {
   // Test if the value is already loop-invariant.
   if (isLoopInvariant(I))
     return true;
   if (!isSafeToSpeculativelyExecute(I))
     return false;
   if (I->mayReadFromMemory())
     return false;
-  // The landingpad instruction is immobile.
-  if (isa<LandingPadInst>(I))
+  // EH block instructions are immobile.
+  if (I->isEHPad())
     return false;
   // Determine the insertion point, unless one was given.
   if (!InsertPt) {
     BasicBlock *Preheader = getLoopPreheader();
     // Without a preheader, hoisting is not feasible.
     if (!Preheader)
       return false;
     InsertPt = Preheader->getTerminator();

lib/AsmParser/LLLexer.cpp

#define KEYWORD(STR)                                                           \
   KEYWORD(thread_local);
   KEYWORD(localdynamic);
   KEYWORD(initialexec);
   KEYWORD(localexec);
   KEYWORD(zeroinitializer);
   KEYWORD(undef);
   KEYWORD(null);
   KEYWORD(to);
+  KEYWORD(caller);
   KEYWORD(tail);
   KEYWORD(musttail);
   KEYWORD(target);
   KEYWORD(triple);
   KEYWORD(unwind);
   KEYWORD(deplibs);             // FIXME: Remove in 4.0.
   KEYWORD(datalayout);
   KEYWORD(volatile);
#define INSTKEYWORD(STR, Enum)                                                 \
   INSTKEYWORD(getelementptr, GetElementPtr);
 
   INSTKEYWORD(extractelement, ExtractElement);
   INSTKEYWORD(insertelement,  InsertElement);
   INSTKEYWORD(shufflevector,  ShuffleVector);
   INSTKEYWORD(extractvalue,   ExtractValue);
   INSTKEYWORD(insertvalue,    InsertValue);
   INSTKEYWORD(landingpad,     LandingPad);
+  INSTKEYWORD(cleanupret,     CleanupRet);
+  INSTKEYWORD(catchret,       CatchRet);
+  INSTKEYWORD(catchpad,     CatchPad);
+  INSTKEYWORD(terminatepad, TerminatePad);
+  INSTKEYWORD(cleanuppad,   CleanupPad);
+  INSTKEYWORD(catchendpad,  CatchEndPad);
 #undef INSTKEYWORD
 
 #define DWKEYWORD(TYPE, TOKEN)                                                 \
   do {                                                                         \
     if (Keyword.startswith("DW_" #TYPE "_")) {                                 \
       StrVal.assign(Keyword.begin(), Keyword.end());                           \
       return lltok::TOKEN;                                                     \
     }                                                                          \

lib/AsmParser/LLParser.h

struct ParamInfo {
       ParamInfo(LocTy loc, Value *v, AttributeSet attrs)
         : Loc(loc), V(v), Attrs(attrs) {}
     };
     bool ParseParameterList(SmallVectorImpl<ParamInfo> &ArgList,
                             PerFunctionState &PFS,
                             bool IsMustTailCall = false,
                             bool InVarArgsFunc = false);
 
+    bool ParseExceptionArgs(SmallVectorImpl<Value *> &Args,
+                            PerFunctionState &PFS);
+
     // Constant Parsing.
     bool ParseValID(ValID &ID, PerFunctionState *PFS = nullptr);
     bool ParseGlobalValue(Type *Ty, Constant *&V);
     bool ParseGlobalTypeAndValue(Constant *&V);
     bool ParseGlobalValueVector(SmallVectorImpl<Constant *> &Elts);
     bool parseOptionalComdat(StringRef GlobalName, Comdat *&C);
     bool ParseMetadataAsValue(Value *&V, PerFunctionState &PFS);
     bool ParseValueAsMetadata(Metadata *&MD, const Twine &TypeMsg,
#include "llvm/IR/Metadata.def"
     bool ParseCmpPredicate(unsigned &Pred, unsigned Opc);
 
     bool ParseRet(Instruction *&Inst, BasicBlock *BB, PerFunctionState &PFS);
     bool ParseBr(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseSwitch(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseIndirectBr(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseInvoke(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseResume(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCleanupRet(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCatchRet(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCatchPad(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseTerminatePad(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCleanupPad(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCatchEndPad(Instruction *&Inst, PerFunctionState &PFS);
 
     bool ParseArithmetic(Instruction *&I, PerFunctionState &PFS, unsigned Opc,
                          unsigned OperandType);
     bool ParseLogical(Instruction *&I, PerFunctionState &PFS, unsigned Opc);
     bool ParseCompare(Instruction *&I, PerFunctionState &PFS, unsigned Opc);
     bool ParseCast(Instruction *&I, PerFunctionState &PFS, unsigned Opc);
     bool ParseSelect(Instruction *&I, PerFunctionState &PFS);
     bool ParseVA_Arg(Instruction *&I, PerFunctionState &PFS);

lib/AsmParser/LLParser.cpp

int LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
   // Terminator Instructions.
   case lltok::kw_unreachable: Inst = new UnreachableInst(Context); return false;
   case lltok::kw_ret:         return ParseRet(Inst, BB, PFS);
   case lltok::kw_br:          return ParseBr(Inst, PFS);
   case lltok::kw_switch:      return ParseSwitch(Inst, PFS);
   case lltok::kw_indirectbr:  return ParseIndirectBr(Inst, PFS);
   case lltok::kw_invoke:      return ParseInvoke(Inst, PFS);
   case lltok::kw_resume:      return ParseResume(Inst, PFS);
+  case lltok::kw_cleanupret:  return ParseCleanupRet(Inst, PFS);
+  case lltok::kw_catchret:    return ParseCatchRet(Inst, PFS);
+  case lltok::kw_catchpad:  return ParseCatchPad(Inst, PFS);
+  case lltok::kw_terminatepad: return ParseTerminatePad(Inst, PFS);
+  case lltok::kw_cleanuppad: return ParseCleanupPad(Inst, PFS);
+  case lltok::kw_catchendpad: return ParseCatchEndPad(Inst, PFS);
   // Binary Operators.
   case lltok::kw_add:
   case lltok::kw_sub:
   case lltok::kw_mul:
   case lltok::kw_shl: {
     bool NUW = EatIfPresent(lltok::kw_nuw);
     bool NSW = EatIfPresent(lltok::kw_nsw);
     if (!NUW) NUW = EatIfPresent(lltok::kw_nuw);
bool LLParser::ParseResume(Instruction *&Inst, PerFunctionState &PFS) {
   if (ParseTypeAndValue(Exn, ExnLoc, PFS))
     return true;
 
   ResumeInst *RI = ResumeInst::Create(Exn);
   Inst = RI;
   return false;
 }
 
+bool LLParser::ParseExceptionArgs(SmallVectorImpl<Value *> &Args,
+                                  PerFunctionState &PFS) {
+  if (ParseToken(lltok::lsquare, "expected '[' in cleanuppad"))
+    return true;
+
+  while (Lex.getKind() != lltok::rsquare) {
+    // If this isn't the first argument, we need a comma.
+    if (!Args.empty() &&
+        ParseToken(lltok::comma, "expected ',' in argument list"))
+      return true;
+
+    // Parse the argument.
+    LocTy ArgLoc;
+    Type *ArgTy = nullptr;
+    if (ParseType(ArgTy, ArgLoc))
+      return true;
+
+    Value *V;
+    if (ArgTy->isMetadataTy()) {
+      if (ParseMetadataAsValue(V, PFS))
+        return true;
+    } else {
+      if (ParseValue(ArgTy, V, PFS))
+        return true;
+    }
+    Args.push_back(V);
+  }
+
+  Lex.Lex();  // Lex the ']'.
+  return false;
+}
+
+/// ParseCleanupRet
+///   ::= 'cleanupret' ('void' | TypeAndValue) unwind ('to' 'caller' | TypeAndValue)
+bool LLParser::ParseCleanupRet(Instruction *&Inst, PerFunctionState &PFS) {
+  Type *RetTy = nullptr;
+  Value *RetVal = nullptr;
+  if (ParseType(RetTy, /*AllowVoid=*/true))
+    return true;
+
+  if (!RetTy->isVoidTy())
+    if (ParseValue(RetTy, RetVal, PFS))
+      return true;
+
+  if (ParseToken(lltok::kw_unwind, "expected 'unwind' in cleanupret"))
+    return true;
+
+  BasicBlock *UnwindBB = nullptr;
+  if (Lex.getKind() == lltok::kw_to) {
+    Lex.Lex();
+    if (ParseToken(lltok::kw_caller, "expected 'caller' in cleanupret"))
+      return true;
+  } else {
+    if (ParseTypeAndBasicBlock(UnwindBB, PFS)) {
+      return true;
+    }
+  }
+
+  Inst = CleanupReturnInst::Create(Context, RetVal, UnwindBB);
+  return false;
+}
+
+/// ParseCatchRet
+///   ::= 'catchret' TypeAndValue
+bool LLParser::ParseCatchRet(Instruction *&Inst, PerFunctionState &PFS) {
+  BasicBlock *BB;
+  if (ParseTypeAndBasicBlock(BB, PFS))
+      return true;
+
+  Inst = CatchReturnInst::Create(BB);
+  return false;
+}
+
+/// ParseCatchPad
+///   ::= 'catchpad' Type ParamList 'to' TypeAndValue 'unwind' TypeAndValue
+bool LLParser::ParseCatchPad(Instruction *&Inst, PerFunctionState &PFS) {
+  Type *RetType = nullptr;
+
+  SmallVector<Value *, 8> Args;
+  if (ParseType(RetType, /*AllowVoid=*/true) || ParseExceptionArgs(Args, PFS))
+    return true;
+
+  BasicBlock *NormalBB, *UnwindBB;
+  if (ParseToken(lltok::kw_to, "expected 'to' in catchpad") ||
+      ParseTypeAndBasicBlock(NormalBB, PFS) ||
+      ParseToken(lltok::kw_unwind, "expected 'unwind' in catchpad") ||
+      ParseTypeAndBasicBlock(UnwindBB, PFS))
+    return true;
+
+  Inst = CatchPadInst::Create(RetType, NormalBB, UnwindBB, Args);
+  return false;
+}
+
+/// ParseTerminatePad
+///   ::= 'terminatepad' ParamList 'to' TypeAndValue
+bool LLParser::ParseTerminatePad(Instruction *&Inst, PerFunctionState &PFS) {
+  SmallVector<Value *, 8> Args;
+  if (ParseExceptionArgs(Args, PFS))
+    return true;
+
+  if (ParseToken(lltok::kw_unwind, "expected 'unwind' in terminatepad"))
+    return true;
+
+  BasicBlock *UnwindBB = nullptr;
+  if (Lex.getKind() == lltok::kw_to) {
+    Lex.Lex();
+    if (ParseToken(lltok::kw_caller, "expected 'caller' in terminatepad"))
+      return true;
+  } else {
+    if (ParseTypeAndBasicBlock(UnwindBB, PFS)) {
+      return true;
+    }
+  }
+
+  Inst = TerminatePadInst::Create(Context, UnwindBB, Args);
+  return false;
+}
+
+/// ParseCleanupPad
+///   ::= 'cleanuppad' ParamList
+bool LLParser::ParseCleanupPad(Instruction *&Inst, PerFunctionState &PFS) {
+  Type *RetType = nullptr;
+
+  SmallVector<Value *, 8> Args;
+  if (ParseType(RetType, /*AllowVoid=*/true) || ParseExceptionArgs(Args, PFS))
+    return true;
+
+  Inst = CleanupPadInst::Create(RetType, Args);
+  return false;
+}
+
+/// ParseCatchEndPad
+///   ::= 'catchendpad' unwind ('to' 'caller' | TypeAndValue)
+bool LLParser::ParseCatchEndPad(Instruction *&Inst, PerFunctionState &PFS) {
+  if (ParseToken(lltok::kw_unwind, "expected 'unwind' in catchendpad"))
+    return true;
+
+  BasicBlock *UnwindBB = nullptr;
+  if (Lex.getKind() == lltok::kw_to) {
+    Lex.Lex();
+    if (Lex.getKind() == lltok::kw_caller) {
+      Lex.Lex();
+    } else {
+      return true;
+    }
+  } else {
+    if (ParseTypeAndBasicBlock(UnwindBB, PFS)) {
+      return true;
+    }
+  }
+
+  Inst = CatchEndPadInst::Create(Context, UnwindBB);
+  return false;
+}
+
 //===----------------------------------------------------------------------===//
 // Binary Operators.
 //===----------------------------------------------------------------------===//
 
 /// ParseArithmetic
 ///  ::= ArithmeticOps TypeAndValue ',' Value
 ///
 /// If OperandType is 0, then any FP or integer operand is allowed.  If it is 1,

lib/AsmParser/LLToken.h

enum Kind {
     kw_unnamed_addr,
     kw_externally_initialized,
     kw_extern_weak,
     kw_external, kw_thread_local,
     kw_localdynamic, kw_initialexec, kw_localexec,
     kw_zeroinitializer,
     kw_undef, kw_null,
     kw_to,
+    kw_caller,
     kw_tail,
     kw_musttail,
     kw_target,
     kw_triple,
     kw_unwind,
     kw_deplibs,                 // FIXME: Remove in 4.0
     kw_datalayout,
     kw_volatile,
enum Kind {
     kw_trunc, kw_zext, kw_sext, kw_fptrunc, kw_fpext, kw_uitofp, kw_sitofp,
     kw_fptoui, kw_fptosi, kw_inttoptr, kw_ptrtoint, kw_bitcast,
     kw_addrspacecast,
     kw_select, kw_va_arg,
 
     kw_landingpad, kw_personality, kw_cleanup, kw_catch, kw_filter,
 
     kw_ret, kw_br, kw_switch, kw_indirectbr, kw_invoke, kw_resume,
-    kw_unreachable,
+    kw_unreachable, kw_cleanupret, kw_catchret, kw_catchpad,
+    kw_terminatepad, kw_cleanuppad, kw_catchendpad,
 
     kw_alloca, kw_load, kw_store, kw_fence, kw_cmpxchg, kw_atomicrmw,
     kw_getelementptr,
 
     kw_extractelement, kw_insertelement, kw_shufflevector,
     kw_extractvalue, kw_insertvalue, kw_blockaddress,
 
     // Metadata types.

lib/Bitcode/Reader/BitcodeReader.cpp

case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
                                Type::getInt1Ty(Context));
         if (!FalseDest || !Cond)
           return error("Invalid record");
         I = BranchInst::Create(TrueDest, FalseDest, Cond);
         InstructionList.push_back(I);
       }
       break;
     }
+    // CLEANUPRET: [] or [ty,val] or [bb#] or [ty,val,bb#]
+    case bitc::FUNC_CODE_INST_CLEANUPRET: {
+      if (Record.size() < 2)
+        return error("Invalid record");
+      unsigned Idx = 0;
+      bool HasReturnValue = !!Record[Idx++];
+      bool HasUnwindDest = !!Record[Idx++];
+      Value *RetVal = nullptr;
+      BasicBlock *UnwindDest = nullptr;
+
+      if (HasReturnValue && getValueTypePair(Record, Idx, NextValueNo, RetVal))
+        return error("Invalid record");
+      if (HasUnwindDest) {
+        if (Idx == Record.size())
+          return error("Invalid record");
+        UnwindDest = getBasicBlock(Record[Idx++]);
+        if (!UnwindDest)
+          return error("Invalid record");
+      }
+
+      if (Record.size() != Idx)
+        return error("Invalid record");
+
+      I = CleanupReturnInst::Create(Context, RetVal, UnwindDest);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_CATCHRET: { // CATCHRET: [bb#]
+      if (Record.size() != 1)
+        return error("Invalid record");
+      BasicBlock *BB = getBasicBlock(Record[0]);
+      if (!BB)
+        return error("Invalid record");
+      I = CatchReturnInst::Create(BB);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_CATCHPAD: { // CATCHPAD: [ty,bb#,bb#,num,(ty,val)*]
+      if (Record.size() < 4)
+        return error("Invalid record");
+      unsigned Idx = 0;
+      Type *Ty = getTypeByID(Record[Idx++]);
+      if (!Ty)
+        return error("Invalid record");
+      BasicBlock *NormalBB = getBasicBlock(Record[Idx++]);
+      if (!NormalBB)
+        return error("Invalid record");
+      BasicBlock *UnwindBB = getBasicBlock(Record[Idx++]);
+      if (!UnwindBB)
+        return error("Invalid record");
+      unsigned NumArgOperands = Record[Idx++];
+      SmallVector<Value *, 2> Args;
+      for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
+        Value *Val;
+        if (getValueTypePair(Record, Idx, NextValueNo, Val))
+          return error("Invalid record");
+        Args.push_back(Val);
+      }
+      if (Record.size() != Idx)
+        return error("Invalid record");
+
+      I = CatchPadInst::Create(Ty, NormalBB, UnwindBB, Args);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_TERMINATEPAD: { // TERMINATEPAD: [bb#,num,(ty,val)*]
+      if (Record.size() < 1)
+        return error("Invalid record");
+      unsigned Idx = 0;
+      bool HasUnwindDest = !!Record[Idx++];
+      BasicBlock *UnwindDest = nullptr;
+      if (HasUnwindDest) {
+        if (Idx == Record.size())
+          return error("Invalid record");
+        UnwindDest = getBasicBlock(Record[Idx++]);
+        if (!UnwindDest)
+          return error("Invalid record");
+      }
+      unsigned NumArgOperands = Record[Idx++];
+      SmallVector<Value *, 2> Args;
+      for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
+        Value *Val;
+        if (getValueTypePair(Record, Idx, NextValueNo, Val))
+          return error("Invalid record");
+        Args.push_back(Val);
+      }
+      if (Record.size() != Idx)
+        return error("Invalid record");
+
+      I = TerminatePadInst::Create(Context, UnwindDest, Args);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_CLEANUPPAD: { // CLEANUPPAD: [ty, num,(ty,val)*]
+      if (Record.size() < 2)
+        return error("Invalid record");
+      unsigned Idx = 0;
+      Type *Ty = getTypeByID(Record[Idx++]);
+      if (!Ty)
+        return error("Invalid record");
+      unsigned NumArgOperands = Record[Idx++];
+      SmallVector<Value *, 2> Args;
+      for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
+        Value *Val;
+        if (getValueTypePair(Record, Idx, NextValueNo, Val))
+          return error("Invalid record");
+        Args.push_back(Val);
+      }
+      if (Record.size() != Idx)
+        return error("Invalid record");
+
+      I = CleanupPadInst::Create(Ty, Args);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_CATCHENDPAD: { // CATCHENDPADINST: [bb#] or []
+      if (Record.size() > 1)
+        return error("Invalid record");
+      BasicBlock *BB = nullptr;
+      if (Record.size() == 1) {
+        BB = getBasicBlock(Record[0]);
+        if (!BB)
+          return error("Invalid record");
+      }
+      I = CatchEndPadInst::Create(Context, BB);
+      InstructionList.push_back(I);
+      break;
+    }
     case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, op0, op1, ...]
       // Check magic
       if ((Record[0] >> 16) == SWITCH_INST_MAGIC) {
         // "New" SwitchInst format with case ranges. The changes to write this
         // format were reverted but we still recognize bitcode that uses it.
         // Hopefully someday we will have support for case ranges and can use
         // this format again.
 

lib/Bitcode/Writer/BitcodeWriter.cpp

if (FTy->isVarArg()) {
         PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
     }
     break;
   }
   case Instruction::Resume:
     Code = bitc::FUNC_CODE_INST_RESUME;
     PushValueAndType(I.getOperand(0), InstID, Vals, VE);
     break;
+  case Instruction::CleanupRet: {
+    Code = bitc::FUNC_CODE_INST_CLEANUPRET;
+    const auto &CRI = cast<CleanupReturnInst>(I);
+    Vals.push_back(CRI.hasReturnValue());
+    Vals.push_back(CRI.hasUnwindDest());
+    if (CRI.hasReturnValue())
+      PushValueAndType(CRI.getReturnValue(), InstID, Vals, VE);
+    if (CRI.hasUnwindDest())
+      Vals.push_back(VE.getValueID(CRI.getUnwindDest()));
+    break;
+  }
+  case Instruction::CatchRet: {
+    Code = bitc::FUNC_CODE_INST_CATCHRET;
+    const auto &CRI = cast<CatchReturnInst>(I);
+    Vals.push_back(VE.getValueID(CRI.getSuccessor()));
+    break;
+  }
+  case Instruction::CatchPad: {
+    Code = bitc::FUNC_CODE_INST_CATCHPAD;
+    const auto &CPI = cast<CatchPadInst>(I);
+    Vals.push_back(VE.getTypeID(CPI.getType()));
+    Vals.push_back(VE.getValueID(CPI.getNormalDest()));
+    Vals.push_back(VE.getValueID(CPI.getUnwindDest()));
+    unsigned NumArgOperands = CPI.getNumArgOperands();
+    Vals.push_back(NumArgOperands);
+    for (unsigned Op = 0; Op != NumArgOperands; ++Op)
+      PushValueAndType(CPI.getArgOperand(Op), InstID, Vals, VE);
+    break;
+  }
+  case Instruction::TerminatePad: {
+    Code = bitc::FUNC_CODE_INST_TERMINATEPAD;
+    const auto &TPI = cast<TerminatePadInst>(I);
+    Vals.push_back(TPI.hasUnwindDest());
+    if (TPI.hasUnwindDest())
+      Vals.push_back(VE.getValueID(TPI.getUnwindDest()));
+    unsigned NumArgOperands = TPI.getNumArgOperands();
+    Vals.push_back(NumArgOperands);
+    for (unsigned Op = 0; Op != NumArgOperands; ++Op)
+      PushValueAndType(TPI.getArgOperand(Op), InstID, Vals, VE);
+    break;
+  }
+  case Instruction::CleanupPad: {
+    Code = bitc::FUNC_CODE_INST_CLEANUPPAD;
+    const auto &CPI = cast<CleanupPadInst>(I);
+    Vals.push_back(VE.getTypeID(CPI.getType()));
+    unsigned NumOperands = CPI.getNumOperands();
+    Vals.push_back(NumOperands);
+    for (unsigned Op = 0; Op != NumOperands; ++Op)
+      PushValueAndType(CPI.getOperand(Op), InstID, Vals, VE);
+    break;
+  }
+  case Instruction::CatchEndPad: {
+    Code = bitc::FUNC_CODE_INST_CATCHENDPAD;
+    const auto &CEPI = cast<CatchEndPadInst>(I);
+    if (CEPI.hasUnwindDest())
+      Vals.push_back(VE.getValueID(CEPI.getUnwindDest()));
+    break;
+  }
   case Instruction::Unreachable:
     Code = bitc::FUNC_CODE_INST_UNREACHABLE;
     AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
     break;
 
   case Instruction::PHI: {
     const PHINode &PN = cast<PHINode>(I);
     Code = bitc::FUNC_CODE_INST_PHI;

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

std::pair<SDValue, SDValue> lowerInvokable(
           MachineBasicBlock *LandingPad);
 
   // Terminator instructions.
   void visitRet(const ReturnInst &I);
   void visitBr(const BranchInst &I);
   void visitSwitch(const SwitchInst &I);
   void visitIndirectBr(const IndirectBrInst &I);
   void visitUnreachable(const UnreachableInst &I);
+  void visitCleanupRet(const CleanupReturnInst &I);
+  void visitCatchEndPad(const CatchEndPadInst &I);
+  void visitCatchRet(const CatchReturnInst &I);
+  void visitCatchPad(const CatchPadInst &I);
+  void visitTerminatePad(const TerminatePadInst &TPI);
+  void visitCleanupPad(const CleanupPadInst &CPI);
 
   uint32_t getEdgeWeight(const MachineBasicBlock *Src,
                          const MachineBasicBlock *Dst) const;
   void addSuccessorWithWeight(MachineBasicBlock *Src, MachineBasicBlock *Dst,
                               uint32_t Weight = 0);
 public:
   void visitSwitchCase(CaseBlock &CB,
                        MachineBasicBlock *SwitchBB);

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

RegsForValue RFV(*DAG.getContext(), TLI, DAG.getDataLayout(), InReg,
                      Inst->getType());
     SDValue Chain = DAG.getEntryNode();
     return RFV.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(), Chain, nullptr, V);
   }
 
   llvm_unreachable("Can't get register for value!");
 }
 
+void SelectionDAGBuilder::visitCleanupRet(const CleanupReturnInst &I) {
+  report_fatal_error("visitCleanupRet not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCatchEndPad(const CatchEndPadInst &I) {
+  report_fatal_error("visitCatchEndPad not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCatchRet(const CatchReturnInst &I) {
+  report_fatal_error("visitCatchRet not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCatchPad(const CatchPadInst &I) {
+  report_fatal_error("visitCatchPad not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitTerminatePad(const TerminatePadInst &TPI) {
+  report_fatal_error("visitTerminatePad not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCleanupPad(const CleanupPadInst &CPI) {
+  report_fatal_error("visitCleanupPad not yet implemented!");
+}
+
 void SelectionDAGBuilder::visitRet(const ReturnInst &I) {
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
   auto &DL = DAG.getDataLayout();
   SDValue Chain = getControlRoot();
   SmallVector<ISD::OutputArg, 8> Outs;
   SmallVector<SDValue, 8> OutVals;
 
   if (!FuncInfo.CanLowerReturn) {

lib/CodeGen/TargetLoweringBase.cpp

#include "llvm/IR/Instruction.def"
   switch (static_cast<InstructionOpcodes>(Opcode)) {
   case Ret:            return 0;
   case Br:             return 0;
   case Switch:         return 0;
   case IndirectBr:     return 0;
   case Invoke:         return 0;
   case Resume:         return 0;
   case Unreachable:    return 0;
+  case CleanupRet:     return 0;
+  case CatchEndPad:  return 0;
+  case CatchRet:       return 0;
+  case CatchPad:     return 0;
+  case TerminatePad: return 0;
+  case CleanupPad:   return 0;
   case Add:            return ISD::ADD;
   case FAdd:           return ISD::FADD;
   case Sub:            return ISD::SUB;
   case FSub:           return ISD::FSUB;
   case Mul:            return ISD::MUL;
   case FMul:           return ISD::FMUL;
   case UDiv:           return ISD::UDIV;
   case SDiv:           return ISD::SDIV;

lib/IR/AsmWriter.cpp

for (unsigned i = 0, e = LPI->getNumClauses(); i != e; ++i) {
       if (i != 0 || LPI->isCleanup()) Out << "\n";
       if (LPI->isCatch(i))
         Out << "          catch ";
       else
         Out << "          filter ";
 
       writeOperand(LPI->getClause(i), true);
     }
+  } else if (const auto *CPI = dyn_cast<CatchPadInst>(&I)) {
+    Out << ' ';
+    TypePrinter.print(I.getType(), Out);
+
+    Out << " [";
+    for (unsigned Op = 0, NumOps = CPI->getNumArgOperands(); Op < NumOps;
+         ++Op) {
+      if (Op > 0)
+        Out << ", ";
+      writeOperand(CPI->getArgOperand(Op), /*PrintType=*/true);
+    }
+    Out << "] to ";
+    writeOperand(CPI->getNormalDest(), /*PrintType=*/true);
+    Out << " unwind ";
+    writeOperand(CPI->getUnwindDest(), /*PrintType=*/true);
+  } else if (const auto *TPI = dyn_cast<TerminatePadInst>(&I)) {
+    Out << " [";
+    for (unsigned Op = 0, NumOps = TPI->getNumArgOperands(); Op < NumOps;
+         ++Op) {
+      if (Op > 0)
+        Out << ", ";
+      writeOperand(TPI->getArgOperand(Op), /*PrintType=*/true);
+    }
+    Out << "] unwind ";
+    if (TPI->hasUnwindDest())
+      writeOperand(TPI->getUnwindDest(), /*PrintType=*/true);
+    else
+      Out << "to caller";
+  } else if (const auto *CPI = dyn_cast<CleanupPadInst>(&I)) {
+    Out << ' ';
+    TypePrinter.print(I.getType(), Out);
+
+    Out << " [";
+    for (unsigned Op = 0, NumOps = CPI->getNumOperands(); Op < NumOps; ++Op) {
+      if (Op > 0)
+        Out << ", ";
+      writeOperand(CPI->getOperand(Op), /*PrintType=*/true);
+    }
+    Out << "]";
   } else if (isa<ReturnInst>(I) && !Operand) {
     Out << " void";
+  } else if (const auto *CRI = dyn_cast<CleanupReturnInst>(&I)) {
+    if (CRI->hasReturnValue()) {
+      Out << ' ';
+      writeOperand(CRI->getReturnValue(), /*PrintType=*/true);
+    } else {
+      Out << " void";
+    }
+
+    Out << " unwind ";
+    if (CRI->hasUnwindDest())
+      writeOperand(CRI->getUnwindDest(), /*PrintType=*/true);
+    else
+      Out << "to caller";
+  } else if (const auto *CEPI = dyn_cast<CatchEndPadInst>(&I)) {
+    Out << " unwind ";
+    if (CEPI->hasUnwindDest())
+      writeOperand(CEPI->getUnwindDest(), /*PrintType=*/true);
+    else
+      Out << "to caller";
   } else if (const CallInst *CI = dyn_cast<CallInst>(&I)) {
     // Print the calling convention being used.
     if (CI->getCallingConv() != CallingConv::C) {
       Out << " ";
       PrintCallingConv(CI->getCallingConv(), Out);
     }
 
     Operand = CI->getCalledValue();

lib/IR/BasicBlock.cpp

 }
 
 BasicBlock::iterator BasicBlock::getFirstInsertionPt() {
   Instruction *FirstNonPHI = getFirstNonPHI();
   if (!FirstNonPHI)
     return end();
 
   iterator InsertPt = FirstNonPHI;
-  if (isa<LandingPadInst>(InsertPt)) ++InsertPt;
+  if (InsertPt->isEHPad()) ++InsertPt;
   return InsertPt;
 }
 
 void BasicBlock::dropAllReferences() {
   for(iterator I = begin(), E = end(); I != E; ++I)
     I->dropAllReferences();
 }
 
for (iterator II = begin(); (PN = dyn_cast<PHINode>(II)); ) {
         if (PNV != PN) {
           PN->replaceAllUsesWith(PNV);
           PN->eraseFromParent();
         }
     }
   }
 }
 
+bool BasicBlock::isSplittable() const {
+  return !isa<CatchEndPadInst>(getFirstNonPHI());
+}
 
 /// This splits a basic block into two at the specified
 /// instruction.  Note that all instructions BEFORE the specified iterator stay
 /// as part of the original basic block, an unconditional branch is added to
 /// the new BB, and the rest of the instructions in the BB are moved to the new
 /// BB, including the old terminator.  This invalidates the iterator.
 ///
 /// Note that this only works on well formed basic blocks (must have a

lib/IR/Instruction.cpp

const char *Instruction::getOpcodeName(unsigned OpCode) {
   // Terminators
   case Ret:    return "ret";
   case Br:     return "br";
   case Switch: return "switch";
   case IndirectBr: return "indirectbr";
   case Invoke: return "invoke";
   case Resume: return "resume";
   case Unreachable: return "unreachable";
+  case CleanupRet: return "cleanupret";
+  case CatchEndPad: return "catchendpad";
+  case CatchRet: return "catchret";
+  case CatchPad: return "catchpad";
+  case TerminatePad: return "terminatepad";
 
   // Standard binary operators...
   case Add: return "add";
   case FAdd: return "fadd";
   case Sub: return "sub";
   case FSub: return "fsub";
   case Mul: return "mul";
   case FMul: return "fmul";
const char *Instruction::getOpcodeName(unsigned OpCode) {
   case AShr:           return "ashr";
   case VAArg:          return "va_arg";
   case ExtractElement: return "extractelement";
   case InsertElement:  return "insertelement";
   case ShuffleVector:  return "shufflevector";
   case ExtractValue:   return "extractvalue";
   case InsertValue:    return "insertvalue";
   case LandingPad:     return "landingpad";
+  case CleanupPad:   return "cleanuppad";
 
   default: return "<Invalid operator> ";
   }
 }
 
 /// Return true if both instructions have the same special state
 /// This must be kept in sync with lib/Transforms/IPO/MergeFunctions.cpp.
 static bool haveSameSpecialState(const Instruction *I1, const Instruction *I2,

 bool Instruction::mayReadFromMemory() const {
   switch (getOpcode()) {
   default: return false;
   case Instruction::VAArg:
   case Instruction::Load:
   case Instruction::Fence: // FIXME: refine definition of mayReadFromMemory
   case Instruction::AtomicCmpXchg:
   case Instruction::AtomicRMW:
+  case Instruction::CatchRet:
+  case Instruction::TerminatePad:
     return true;
   case Instruction::Call:
     return !cast<CallInst>(this)->doesNotAccessMemory();
   case Instruction::Invoke:
     return !cast<InvokeInst>(this)->doesNotAccessMemory();
   case Instruction::Store:
     return !cast<StoreInst>(this)->isUnordered();
   }
 }
 
 /// mayWriteToMemory - Return true if this instruction may modify memory.
 ///
 bool Instruction::mayWriteToMemory() const {
   switch (getOpcode()) {
   default: return false;
   case Instruction::Fence: // FIXME: refine definition of mayWriteToMemory
   case Instruction::Store:
   case Instruction::VAArg:
   case Instruction::AtomicCmpXchg:
   case Instruction::AtomicRMW:
+  case Instruction::CatchRet:
+  case Instruction::TerminatePad:
     return true;
   case Instruction::Call:
     return !cast<CallInst>(this)->onlyReadsMemory();
   case Instruction::Invoke:
     return !cast<InvokeInst>(this)->onlyReadsMemory();
   case Instruction::Load:
     return !cast<LoadInst>(this)->isUnordered();
   }
bool Instruction::isAtomic() const {
   case Instruction::Store:
     return cast<StoreInst>(this)->getOrdering() != NotAtomic;
   }
 }
 
 bool Instruction::mayThrow() const {
   if (const CallInst *CI = dyn_cast<CallInst>(this))
     return !CI->doesNotThrow();
+  if (const auto *CRI = dyn_cast<CleanupReturnInst>(this))
+    return CRI->unwindsToCaller();
+  if (const auto *CEPI = dyn_cast<CatchEndPadInst>(this))
+    return CEPI->unwindsToCaller();
+  if (const auto *TPI = dyn_cast<TerminatePadInst>(this))
+    return TPI->unwindsToCaller();
   return isa<ResumeInst>(this);
 }
 
 bool Instruction::mayReturn() const {
   if (const CallInst *CI = dyn_cast<CallInst>(this))
     return !CI->doesNotReturn();
   return true;
 }

lib/IR/Instructions.cpp

void ResumeInst::setSuccessorV(unsigned idx, BasicBlock *NewSucc) {
   llvm_unreachable("ResumeInst has no successors!");
 }
 
 BasicBlock *ResumeInst::getSuccessorV(unsigned idx) const {
   llvm_unreachable("ResumeInst has no successors!");
 }
 
 //===----------------------------------------------------------------------===//
+//                        CleanupReturnInst Implementation
+//===----------------------------------------------------------------------===//
+
+CleanupReturnInst::CleanupReturnInst(const CleanupReturnInst &CRI)
+    : TerminatorInst(CRI.getType(), Instruction::CleanupRet,
+                     OperandTraits<CleanupReturnInst>::op_end(this) -
+                         CRI.getNumOperands(),
+                     CRI.getNumOperands()) {
+  SubclassOptionalData = CRI.SubclassOptionalData;
+  if (Value *RetVal = CRI.getReturnValue())
+    setReturnValue(RetVal);
+  if (BasicBlock *UnwindDest = CRI.getUnwindDest())
+    setUnwindDest(UnwindDest);
+}
+
+void CleanupReturnInst::init(Value *RetVal, BasicBlock *UnwindBB) {
+  SubclassOptionalData = 0;
+  if (UnwindBB)
+    setInstructionSubclassData(getSubclassDataFromInstruction() | 1);
+  if (RetVal)
+    setInstructionSubclassData(getSubclassDataFromInstruction() | 2);
+
+  if (UnwindBB)
+    setUnwindDest(UnwindBB);
+  if (RetVal)
+    setReturnValue(RetVal);
+}
+
+CleanupReturnInst::CleanupReturnInst(LLVMContext &C, Value *RetVal,
+                                     BasicBlock *UnwindBB, unsigned Values,
+                                     Instruction *InsertBefore)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::CleanupRet,
+                     OperandTraits<CleanupReturnInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(RetVal, UnwindBB);
+}
+
+CleanupReturnInst::CleanupReturnInst(LLVMContext &C, Value *RetVal,
+                                     BasicBlock *UnwindBB, unsigned Values,
+                                     BasicBlock *InsertAtEnd)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::CleanupRet,
+                     OperandTraits<CleanupReturnInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(RetVal, UnwindBB);
+}
+
+BasicBlock *CleanupReturnInst::getUnwindDest() const {
+  if (hasUnwindDest())
+    return cast<BasicBlock>(getOperand(getUnwindLabelOpIdx()));
+  return nullptr;
+}
+void CleanupReturnInst::setUnwindDest(BasicBlock *NewDest) {
+  assert(NewDest);
+  setOperand(getUnwindLabelOpIdx(), NewDest);
+}
+
+BasicBlock *CleanupReturnInst::getSuccessorV(unsigned Idx) const {
+  assert(Idx == 0);
+  return getUnwindDest();
+}
+unsigned CleanupReturnInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void CleanupReturnInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  assert(Idx == 0);
+  setUnwindDest(B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CatchEndPadInst Implementation
+//===----------------------------------------------------------------------===//
+
+CatchEndPadInst::CatchEndPadInst(const CatchEndPadInst &CRI)
+    : TerminatorInst(CRI.getType(), Instruction::CatchEndPad,
+                     OperandTraits<CatchEndPadInst>::op_end(this) -
+                         CRI.getNumOperands(),
+                     CRI.getNumOperands()) {
+  SubclassOptionalData = CRI.SubclassOptionalData;
+  if (BasicBlock *UnwindDest = CRI.getUnwindDest())
+    setUnwindDest(UnwindDest);
+}
+
+void CatchEndPadInst::init(BasicBlock *UnwindBB) {
+  SubclassOptionalData = 0;
+  if (UnwindBB) {
+    setInstructionSubclassData(getSubclassDataFromInstruction() | 1);
+    setUnwindDest(UnwindBB);
+  }
+}
+
+CatchEndPadInst::CatchEndPadInst(LLVMContext &C, BasicBlock *UnwindBB,
+                                     unsigned Values, Instruction *InsertBefore)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::CatchEndPad,
+                     OperandTraits<CatchEndPadInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(UnwindBB);
+}
+
+CatchEndPadInst::CatchEndPadInst(LLVMContext &C, BasicBlock *UnwindBB,
+                                     unsigned Values, BasicBlock *InsertAtEnd)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::CatchEndPad,
+                     OperandTraits<CatchEndPadInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(UnwindBB);
+}
+
+BasicBlock *CatchEndPadInst::getSuccessorV(unsigned Idx) const {
+  assert(Idx == 0);
+  return getUnwindDest();
+}
+unsigned CatchEndPadInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void CatchEndPadInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  assert(Idx == 0);
+  setUnwindDest(B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CatchReturnInst Implementation
+//===----------------------------------------------------------------------===//
+
+CatchReturnInst::CatchReturnInst(const CatchReturnInst &CRI)
+    : TerminatorInst(Type::getVoidTy(CRI.getContext()), Instruction::CatchRet,
+                     OperandTraits<CatchReturnInst>::op_end(this) -
+                         CRI.getNumOperands(),
+                     CRI.getNumOperands()) {
+  Op<0>() = CRI.Op<0>();
+}
+
+CatchReturnInst::CatchReturnInst(BasicBlock *BB, Instruction *InsertBefore)
+    : TerminatorInst(Type::getVoidTy(BB->getContext()), Instruction::CatchRet,
+                     OperandTraits<CatchReturnInst>::op_begin(this), 1,
+                     InsertBefore) {
+  Op<0>() = BB;
+}
+
+CatchReturnInst::CatchReturnInst(BasicBlock *BB, BasicBlock *InsertAtEnd)
+    : TerminatorInst(Type::getVoidTy(BB->getContext()), Instruction::CatchRet,
+                     OperandTraits<CatchReturnInst>::op_begin(this), 1,
+                     InsertAtEnd) {
+  Op<0>() = BB;
+}
+
+BasicBlock *CatchReturnInst::getSuccessorV(unsigned Idx) const {
+  assert(Idx == 0);
+  return getSuccessor();
+}
+unsigned CatchReturnInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void CatchReturnInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  assert(Idx == 0);
+  setSuccessor(B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CatchPadInst Implementation
+//===----------------------------------------------------------------------===//
+void CatchPadInst::init(BasicBlock *IfNormal, BasicBlock *IfException,
+                          ArrayRef<Value *> Args, const Twine &NameStr) {
+  assert(getNumOperands() == 2 + Args.size() && "NumOperands not set up?");
+  Op<-2>() = IfNormal;
+  Op<-1>() = IfException;
+  std::copy(Args.begin(), Args.end(), op_begin());
+  setName(NameStr);
+}
+
+CatchPadInst::CatchPadInst(const CatchPadInst &CPI)
+    : TerminatorInst(CPI.getType(), Instruction::CatchPad,
+                     OperandTraits<CatchPadInst>::op_end(this) -
+                         CPI.getNumOperands(),
+                     CPI.getNumOperands()) {
+  std::copy(CPI.op_begin(), CPI.op_end(), op_begin());
+}
+
+CatchPadInst::CatchPadInst(Type *RetTy, BasicBlock *IfNormal,
+                               BasicBlock *IfException, ArrayRef<Value *> Args,
+                               unsigned Values, const Twine &NameStr,
+                               Instruction *InsertBefore)
+    : TerminatorInst(RetTy, Instruction::CatchPad,
+                     OperandTraits<CatchPadInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(IfNormal, IfException, Args, NameStr);
+}
+
+CatchPadInst::CatchPadInst(Type *RetTy, BasicBlock *IfNormal,
+                               BasicBlock *IfException, ArrayRef<Value *> Args,
+                               unsigned Values, const Twine &NameStr,
+                               BasicBlock *InsertAtEnd)
+    : TerminatorInst(RetTy, Instruction::CatchPad,
+                     OperandTraits<CatchPadInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(IfNormal, IfException, Args, NameStr);
+}
+
+BasicBlock *CatchPadInst::getSuccessorV(unsigned Idx) const {
+  return getSuccessor(Idx);
+}
+unsigned CatchPadInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void CatchPadInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  return setSuccessor(Idx, B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        TerminatePadInst Implementation
+//===----------------------------------------------------------------------===//
+void TerminatePadInst::init(BasicBlock *BB, ArrayRef<Value *> Args,
+                              const Twine &NameStr) {
+  SubclassOptionalData = 0;
+  if (BB)
+    setInstructionSubclassData(getSubclassDataFromInstruction() | 1);
+  if (BB)
+    Op<-1>() = BB;
+  std::copy(Args.begin(), Args.end(), op_begin());
+  setName(NameStr);
+}
+
+TerminatePadInst::TerminatePadInst(const TerminatePadInst &TPI)
+    : TerminatorInst(TPI.getType(), Instruction::TerminatePad,
+                     OperandTraits<TerminatePadInst>::op_end(this) -
+                         TPI.getNumOperands(),
+                     TPI.getNumOperands()) {
+  SubclassOptionalData = TPI.SubclassOptionalData;
+  std::copy(TPI.op_begin(), TPI.op_end(), op_begin());
+}
+
+TerminatePadInst::TerminatePadInst(LLVMContext &C, BasicBlock *BB,
+                                       ArrayRef<Value *> Args, unsigned Values,
+                                       const Twine &NameStr,
+                                       Instruction *InsertBefore)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::TerminatePad,
+                     OperandTraits<TerminatePadInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(BB, Args, NameStr);
+}
+
+TerminatePadInst::TerminatePadInst(LLVMContext &C, BasicBlock *BB,
+                                       ArrayRef<Value *> Args, unsigned Values,
+                                       const Twine &NameStr,
+                                       BasicBlock *InsertAtEnd)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::TerminatePad,
+                     OperandTraits<TerminatePadInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(BB, Args, NameStr);
+}
+
+BasicBlock *TerminatePadInst::getSuccessorV(unsigned Idx) const {
+  assert(Idx == 0);
+  return getUnwindDest();
+}
+unsigned TerminatePadInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void TerminatePadInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  assert(Idx == 0);
+  return setUnwindDest(B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CleanupPadInst Implementation
+//===----------------------------------------------------------------------===//
+void CleanupPadInst::init(ArrayRef<Value *> Args, const Twine &NameStr) {
+  assert(getNumOperands() == Args.size() && "NumOperands not set up?");
+  std::copy(Args.begin(), Args.end(), op_begin());
+  setName(NameStr);
+}
+
+CleanupPadInst::CleanupPadInst(const CleanupPadInst &CPI)
+    : Instruction(CPI.getType(), Instruction::CleanupPad,
+                  OperandTraits<CleanupPadInst>::op_end(this) -
+                      CPI.getNumOperands(),
+                  CPI.getNumOperands()) {
+  std::copy(CPI.op_begin(), CPI.op_end(), op_begin());
+}
+
+CleanupPadInst::CleanupPadInst(Type *RetTy, ArrayRef<Value *> Args,
+                                   const Twine &NameStr,
+                                   Instruction *InsertBefore)
+    : Instruction(RetTy, Instruction::CleanupPad,
+                  OperandTraits<CleanupPadInst>::op_end(this) - Args.size(),
+                  Args.size(), InsertBefore) {
+  init(Args, NameStr);
+}
+
+CleanupPadInst::CleanupPadInst(Type *RetTy, ArrayRef<Value *> Args,
+                                   const Twine &NameStr,
+                                   BasicBlock *InsertAtEnd)
+    : Instruction(RetTy, Instruction::CleanupPad,
+                  OperandTraits<CleanupPadInst>::op_end(this) - Args.size(),
+                  Args.size(), InsertAtEnd) {
+  init(Args, NameStr);
+}
+
+//===----------------------------------------------------------------------===//
 //                      UnreachableInst Implementation
 //===----------------------------------------------------------------------===//
 
 UnreachableInst::UnreachableInst(LLVMContext &Context, 
                                  Instruction *InsertBefore)
   : TerminatorInst(Type::getVoidTy(Context), Instruction::Unreachable,
                    nullptr, 0, InsertBefore) {
 }

 }
 
 InvokeInst *InvokeInst::cloneImpl() const {
   return new(getNumOperands()) InvokeInst(*this);
 }
 
 ResumeInst *ResumeInst::cloneImpl() const { return new (1) ResumeInst(*this); }
 
+CleanupReturnInst *CleanupReturnInst::cloneImpl() const {
+  return new (getNumOperands()) CleanupReturnInst(*this);
+}
+
+CatchEndPadInst *CatchEndPadInst::cloneImpl() const {
+  return new (getNumOperands()) CatchEndPadInst(*this);
+}
+
+CatchReturnInst *CatchReturnInst::cloneImpl() const {
+  return new (1) CatchReturnInst(*this);
+}
+
+CatchPadInst *CatchPadInst::cloneImpl() const {
+  return new (getNumOperands()) CatchPadInst(*this);
+}
+
+TerminatePadInst *TerminatePadInst::cloneImpl() const {
+  return new (getNumOperands()) TerminatePadInst(*this);
+}
+
+CleanupPadInst *CleanupPadInst::cloneImpl() const {
+  return new (getNumOperands()) CleanupPadInst(*this);
+}
+
 UnreachableInst *UnreachableInst::cloneImpl() const {
   LLVMContext &Context = getContext();
   return new UnreachableInst(Context);
 }

lib/IR/Verifier.cpp

class Verifier : public InstVisitor<Verifier>, VerifierSupport {
   SmallPtrSet<Instruction *, 16> InstsInThisBlock;
 
   /// \brief Keep track of the metadata nodes that have been checked already.
   SmallPtrSet<const Metadata *, 32> MDNodes;
 
   /// \brief Track unresolved string-based type references.
   SmallDenseMap<const MDString *, const MDNode *, 32> UnresolvedTypeRefs;
 
+  /// \brief The result type for a catchpad.
+  Type *CatchPadResultTy;
+
+  /// \brief The result type for a cleanuppad.
+  Type *CleanupPadResultTy;
+
+  /// \brief The result type for a landingpad.
+  Type *LandingPadResultTy;
+
   /// \brief Whether we've seen a call to @llvm.localescape in this function
   /// already.
   bool SawFrameEscape;
 
   /// Stores the count of how many objects were passed to llvm.localescape for a
   /// given function and the largest index passed to llvm.localrecover.
   DenseMap<Function *, std::pair<unsigned, unsigned>> FrameEscapeInfo;
 
 public:
   explicit Verifier(raw_ostream &OS)
-      : VerifierSupport(OS), Context(nullptr), SawFrameEscape(false) {}
+      : VerifierSupport(OS), Context(nullptr), CatchPadResultTy(nullptr),
+        CleanupPadResultTy(nullptr), LandingPadResultTy(nullptr),
+        SawFrameEscape(false) {}
 
   bool verify(const Function &F) {
     M = F.getParent();
     Context = &M->getContext();
 
     // First ensure the function is well-enough formed to compute dominance
     // information.
     if (F.empty()) {
bool verify(const Function &F) {
     // run this code outside of a pass manager.
     // FIXME: It's really gross that we have to cast away constness here.
     DT.recalculate(const_cast<Function &>(F));
 
     Broken = false;
     // FIXME: We strip const here because the inst visitor strips const.
     visit(const_cast<Function &>(F));
     InstsInThisBlock.clear();
+    CatchPadResultTy = nullptr;
+    CleanupPadResultTy = nullptr;
+    LandingPadResultTy = nullptr;
     SawFrameEscape = false;
 
     return !Broken;
   }
 
   bool verify(const Module &M) {
     this->M = &M;
     Context = &M.getContext();
#include "llvm/IR/Metadata.def"
   void visitDbgIntrinsic(StringRef Kind, DbgIntrinsicTy &DII);
   void visitAtomicCmpXchgInst(AtomicCmpXchgInst &CXI);
   void visitAtomicRMWInst(AtomicRMWInst &RMWI);
   void visitFenceInst(FenceInst &FI);
   void visitAllocaInst(AllocaInst &AI);
   void visitExtractValueInst(ExtractValueInst &EVI);
   void visitInsertValueInst(InsertValueInst &IVI);
   void visitLandingPadInst(LandingPadInst &LPI);
+  void visitCatchPadInst(CatchPadInst &CPI);
+  void visitCatchEndPadInst(CatchEndPadInst &CEPI);
+  void visitCleanupPadInst(CleanupPadInst &CPI);
+  void visitCleanupReturnInst(CleanupReturnInst &CRI);
+  void visitTerminatePadInst(TerminatePadInst &TPI);
 
   void VerifyCallSite(CallSite CS);
   void verifyMustTailCall(CallInst &CI);
   bool PerformTypeCheck(Intrinsic::ID ID, Function *F, Type *Ty, int VT,
                         unsigned ArgNo, std::string &Suffix);
   bool VerifyIntrinsicType(Type *Ty, ArrayRef<Intrinsic::IITDescriptor> &Infos,
                            SmallVectorImpl<Type *> &ArgTys);
   bool VerifyIntrinsicIsVarArg(bool isVarArg,
void Verifier::visitCallInst(CallInst &CI) {
 
   if (CI.isMustTailCall())
     verifyMustTailCall(CI);
 }
 
 void Verifier::visitInvokeInst(InvokeInst &II) {
   VerifyCallSite(&II);
 
-  // Verify that there is a landingpad instruction as the first non-PHI
-  // instruction of the 'unwind' destination.
-  Assert(II.getUnwindDest()->isLandingPad(),
-         "The unwind destination does not have a landingpad instruction!", &II);
+  // Verify that the first non-PHI instruction of the unwind destination is an
+  // exception handling instruction.
+  Assert(
+      II.getUnwindDest()->isEHPad(),
+      "The unwind destination does not have an exception handling instruction!",
+      &II);
 
   visitTerminatorInst(II);
 }
 
 /// visitBinaryOperator - Check that both arguments to the binary operator are
 /// of the same type!
 ///
 void Verifier::visitBinaryOperator(BinaryOperator &B) {
void Verifier::visitLandingPadInst(LandingPadInst &LPI) {
   for (pred_iterator I = pred_begin(BB), E = pred_end(BB); I != E; ++I) {
     const InvokeInst *II = dyn_cast<InvokeInst>((*I)->getTerminator());
     Assert(II && II->getUnwindDest() == BB && II->getNormalDest() != BB,
            "Block containing LandingPadInst must be jumped to "
            "only by the unwind edge of an invoke.",
            &LPI);
   }
 
+  if (!LandingPadResultTy)
+    LandingPadResultTy = LPI.getType();
+  else
+    Assert(LandingPadResultTy == LPI.getType(),
+           "The landingpad instruction should have a consistent result type "
+           "inside a function.",
+           &LPI);
+
   Function *F = LPI.getParent()->getParent();
   Assert(F->hasPersonalityFn(),
          "LandingPadInst needs to be in a function with a personality.", &LPI);
 
   // The landingpad instruction must be the first non-PHI instruction in the
   // block.
   Assert(LPI.getParent()->getLandingPadInst() == &LPI,
          "LandingPadInst not the first non-PHI instruction in the block.",
if (LPI.isCatch(i)) {
       Assert(isa<ConstantArray>(Clause) || isa<ConstantAggregateZero>(Clause),
              "Filter operand is not an array of constants!", &LPI);
     }
   }
 
   visitInstruction(LPI);
 }
 
+void Verifier::visitCatchPadInst(CatchPadInst &CPI) {
+  BasicBlock *BB = CPI.getParent();
+
+  if (!CatchPadResultTy)
+    CatchPadResultTy = CPI.getType();
+  else
+    Assert(CatchPadResultTy == CPI.getType(),
+           "The catchpad instruction should have a consistent result type "
+           "inside a function.",
+           &CPI);
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "CatchPadInst needs to be in a function with a personality.", &CPI);
+
+  // The catchpad instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &CPI,
+         "CatchPadInst not the first non-PHI instruction in the block.",
+         &CPI);
+
+  BasicBlock *UnwindDest = CPI.getUnwindDest();
+  Instruction *I = UnwindDest->getFirstNonPHI();
+  Assert(
+      isa<CatchPadInst>(I) || isa<CatchEndPadInst>(I),
+      "CatchPadInst must unwind to a CatchPadInst or a CatchEndPadInst.",
+      &CPI);
+
+  visitTerminatorInst(CPI);
+}
+
+void Verifier::visitCatchEndPadInst(CatchEndPadInst &CEPI) {
+  BasicBlock *BB = CEPI.getParent();
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "CatchEndPadInst needs to be in a function with a personality.",
+         &CEPI);
+
+  // The catchendpad instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &CEPI,
+         "CatchEndPadInst not the first non-PHI instruction in the block.",
+         &CEPI);
+
+  unsigned CatchPadsSeen = 0;
+  for (BasicBlock *PredBB : predecessors(BB))
+    if (isa<CatchPadInst>(PredBB->getTerminator()))
+      ++CatchPadsSeen;
+
+  Assert(CatchPadsSeen <= 1, "CatchEndPadInst must have no more than one "
+                               "CatchPadInst predecessor.",
+         &CEPI);
+
+  if (BasicBlock *UnwindDest = CEPI.getUnwindDest()) {
+    Instruction *I = UnwindDest->getFirstNonPHI();
+    Assert(
+        I->isEHPad() && !isa<LandingPadInst>(I),
+        "CatchEndPad must unwind to an EH block which is not a landingpad.",
+        &CEPI);
+  }
+
+  visitTerminatorInst(CEPI);
+}
+
+void Verifier::visitCleanupPadInst(CleanupPadInst &CPI) {
+  BasicBlock *BB = CPI.getParent();
+
+  if (!CleanupPadResultTy)
+    CleanupPadResultTy = CPI.getType();
+  else
+    Assert(CleanupPadResultTy == CPI.getType(),
+           "The cleanuppad instruction should have a consistent result type "
+           "inside a function.",
+           &CPI);
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "CleanupPadInst needs to be in a function with a personality.", &CPI);
+
+  // The cleanuppad instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &CPI,
+         "CleanupPadInst not the first non-PHI instruction in the block.",
+         &CPI);
+
+  visitInstruction(CPI);
+}
+
+void Verifier::visitCleanupReturnInst(CleanupReturnInst &CRI) {
+  if (BasicBlock *UnwindDest = CRI.getUnwindDest()) {
+    Instruction *I = UnwindDest->getFirstNonPHI();
+    Assert(I->isEHPad() && !isa<LandingPadInst>(I),
+           "CleanupReturnInst must unwind to an EH block which is not a "
+           "landingpad.",
+           &CRI);
+  }
+
+  visitTerminatorInst(CRI);
+}
+
+void Verifier::visitTerminatePadInst(TerminatePadInst &TPI) {
+  BasicBlock *BB = TPI.getParent();
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "TerminatePadInst needs to be in a function with a personality.",
+         &TPI);
+
+  // The terminatepad instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &TPI,
+         "TerminatePadInst not the first non-PHI instruction in the block.",
+         &TPI);
+
+  if (BasicBlock *UnwindDest = TPI.getUnwindDest()) {
+    Instruction *I = UnwindDest->getFirstNonPHI();
+    Assert(I->isEHPad() && !isa<LandingPadInst>(I),
+           "TerminatePadInst must unwind to an EH block which is not a "
+           "landingpad.",
+           &TPI);
+  }
+
+  visitTerminatorInst(TPI);
+}
+
 void Verifier::verifyDominatesUse(Instruction &I, unsigned i) {
   Instruction *Op = cast<Instruction>(I.getOperand(i));
   // If the we have an invalid invoke, don't try to compute the dominance.
   // We already reject it in the invoke specific checks and the dominance
   // computation doesn't handle multiple edges.
   if (InvokeInst *II = dyn_cast<InvokeInst>(Op)) {
     if (II->getNormalDest() == II->getUnwindDest())
       return;

lib/Transforms/Instrumentation/MemorySanitizer.cpp

#undef GET_INTRINSIC_MODREF_BEHAVIOR
 
   void visitLandingPadInst(LandingPadInst &I) {
     // Do nothing.
     // See http://code.google.com/p/memory-sanitizer/issues/detail?id=1
     setShadow(&I, getCleanShadow(&I));
     setOrigin(&I, getCleanOrigin());
   }
 
+  void visitCleanupPadInst(CleanupPadInst &I) {
+    if (!I.getType()->isVoidTy()) {
+      setShadow(&I, getCleanShadow(&I));
+      setOrigin(&I, getCleanOrigin());
+    }
+  }
+
+  void visitCatchPad(CatchPadInst &I) {
+    if (!I.getType()->isVoidTy()) {
+      setShadow(&I, getCleanShadow(&I));
+      setOrigin(&I, getCleanOrigin());
+    }
+  }
+
+  void visitTerminatePad(TerminatePadInst &I) {
+    DEBUG(dbgs() << "TerminatePad: " << I << "\n");
+    // Nothing to do here.
+  }
+
+  void visitCatchEndPadInst(CatchEndPadInst &I) {
+    DEBUG(dbgs() << "CatchEndPad: " << I << "\n");
+    // Nothing to do here.
+  }
+
   void visitGetElementPtrInst(GetElementPtrInst &I) {
     handleShadowOr(I);
   }
 
   void visitExtractValueInst(ExtractValueInst &I) {
     IRBuilder<> IRB(&I);
     Value *Agg = I.getAggregateOperand();
     DEBUG(dbgs() << "ExtractValue:  " << I << "\n");
void dumpInst(Instruction &I) {
     errs() << "QQQ " << I << "\n";
   }
 
   void visitResumeInst(ResumeInst &I) {
     DEBUG(dbgs() << "Resume: " << I << "\n");
     // Nothing to do here.
   }
 
+  void visitCleanupReturnInst(CleanupReturnInst &CRI) {
+    DEBUG(dbgs() << "CleanupReturn: " << CRI << "\n");
+    // Nothing to do here.
+  }
+
+  void visitCatchReturnInst(CatchReturnInst &CRI) {
+    DEBUG(dbgs() << "CatchReturn: " << CRI << "\n");
+    // Nothing to do here.
+  }
+
   void visitInstruction(Instruction &I) {
     // Everything else: stop propagating and check for poisoned shadow.
     if (ClDumpStrictInstructions)
       dumpInst(I);
     DEBUG(dbgs() << "DEFAULT: " << I << "\n");
     for (size_t i = 0, n = I.getNumOperands(); i < n; i++)
       insertShadowCheck(I.getOperand(i), &I);
     setShadow(&I, getCleanShadow(&I));

lib/Transforms/Scalar/ADCE.cpp

bool ADCE::runOnFunction(Function& F) {
   if (skipOptnoneFunction(F))
     return false;
 
   SmallPtrSet<Instruction*, 128> Alive;
   SmallVector<Instruction*, 128> Worklist;
 
   // Collect the set of "root" instructions that are known live.
   for (Instruction &I : inst_range(F)) {
-    if (isa<TerminatorInst>(I) || isa<DbgInfoIntrinsic>(I) ||
-        isa<LandingPadInst>(I) || I.mayHaveSideEffects()) {
+    if (isa<TerminatorInst>(I) || isa<DbgInfoIntrinsic>(I) || I.isEHPad() ||
+        I.mayHaveSideEffects()) {
       Alive.insert(&I);
       Worklist.push_back(&I);
     }
   }
 
   // Propagate liveness backwards to operands.
   while (!Worklist.empty()) {
     Instruction *Curr = Worklist.pop_back_val();

lib/Transforms/Scalar/BDCE.cpp

 INITIALIZE_PASS_BEGIN(BDCE, "bdce", "Bit-Tracking Dead Code Elimination",
                       false, false)
 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
 INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
 INITIALIZE_PASS_END(BDCE, "bdce", "Bit-Tracking Dead Code Elimination",
                     false, false)
 
 static bool isAlwaysLive(Instruction *I) {
-  return isa<TerminatorInst>(I) || isa<DbgInfoIntrinsic>(I) ||
-         isa<LandingPadInst>(I) || I->mayHaveSideEffects();
+  return isa<TerminatorInst>(I) || isa<DbgInfoIntrinsic>(I) || I->isEHPad() ||
+         I->mayHaveSideEffects();
 }
 
 void BDCE::determineLiveOperandBits(const Instruction *UserI,
                                     const Instruction *I, unsigned OperandNo,
                                     const APInt &AOut, APInt &AB,
                                     APInt &KnownZero, APInt &KnownOne,
                                     APInt &KnownZero2, APInt &KnownOne2) {
   unsigned BitWidth = AB.getBitWidth();

lib/Transforms/Scalar/JumpThreading.cpp

if (pred_empty(BB) &&
       BB != &BB->getParent()->getEntryBlock())
     return false;
 
   // If this block has a single predecessor, and if that pred has a single
   // successor, merge the blocks.  This encourages recursive jump threading
   // because now the condition in this block can be threaded through
   // predecessors of our predecessor block.
   if (BasicBlock *SinglePred = BB->getSinglePredecessor()) {
-    if (SinglePred->getTerminator()->getNumSuccessors() == 1 &&
+    const TerminatorInst *TI = SinglePred->getTerminator();
+    if (!TI->isExceptional() && TI->getNumSuccessors() == 1 &&
         SinglePred != BB && !hasAddressTakenAndUsed(BB)) {
       // If SinglePred was a loop header, BB becomes one.
       if (LoopHeaders.erase(SinglePred))
         LoopHeaders.insert(BB);
 
       LVI->eraseBlock(SinglePred);
       MergeBasicBlockIntoOnlyPred(BB);
 

lib/Transforms/Scalar/SCCP.cpp

if (!CI) {
       return;
     }
 
     // Constant condition variables mean the branch can only go a single way.
     Succs[CI->isZero()] = true;
     return;
   }
 
-  if (isa<InvokeInst>(TI)) {
-    // Invoke instructions successors are always executable.
-    Succs[0] = Succs[1] = true;
+  // Unwinding instructions successors are always executable.
+  if (TI.isExceptional()) {
+    Succs.assign(TI.getNumSuccessors(), true);
     return;
   }
 
   if (SwitchInst *SI = dyn_cast<SwitchInst>(&TI)) {
     if (!SI->getNumCases()) {
       Succs[0] = true;
       return;
     }
if (BranchInst *BI = dyn_cast<BranchInst>(TI)) {
     ConstantInt *CI = BCValue.getConstantInt();
     if (!CI)
       return !BCValue.isUndefined();
 
     // Constant condition variables mean the branch can only go a single way.
     return BI->getSuccessor(CI->isZero()) == To;
   }
 
-  // Invoke instructions successors are always executable.
-  if (isa<InvokeInst>(TI))
+  // Unwinding instructions successors are always executable.
+  if (TI->isExceptional())
     return true;
 
   if (SwitchInst *SI = dyn_cast<SwitchInst>(TI)) {
     if (SI->getNumCases() < 1)
       return true;
 
     LatticeVal SCValue = getValueState(SI->getCondition());
     ConstantInt *CI = SCValue.getConstantInt();

lib/Transforms/Utils/BasicBlockUtils.cpp

bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, DominatorTree *DT,
   if (BB->hasAddressTaken()) return false;
 
   // Can't merge if there are multiple predecessors, or no predecessors.
   BasicBlock *PredBB = BB->getUniquePredecessor();
   if (!PredBB) return false;
 
   // Don't break self-loops.
   if (PredBB == BB) return false;
-  // Don't break invokes.
-  if (isa<InvokeInst>(PredBB->getTerminator())) return false;
+  // Don't break unwinding instructions.
+  if (PredBB->getTerminator()->isExceptional())
+    return false;
 
   succ_iterator SI(succ_begin(PredBB)), SE(succ_end(PredBB));
   BasicBlock *OnlySucc = BB;
   for (; SI != SE; ++SI)
     if (*SI != OnlySucc) {
       OnlySucc = nullptr;     // There are multiple distinct successors!
       break;
     }

 /// SplitBlock - Split the specified block at the specified instruction - every
 /// thing before SplitPt stays in Old and everything starting with SplitPt moves
 /// to a new block.  The two blocks are joined by an unconditional branch and
 /// the loop info is updated.
 ///
 BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt,
                              DominatorTree *DT, LoopInfo *LI) {
   BasicBlock::iterator SplitIt = SplitPt;
-  while (isa<PHINode>(SplitIt) || isa<LandingPadInst>(SplitIt))
+  while (isa<PHINode>(SplitIt) || SplitIt->isEHPad())
     ++SplitIt;
   BasicBlock *New = Old->splitBasicBlock(SplitIt, Old->getName()+".split");
 
   // The new block lives in whichever loop the old one did. This preserves
   // LCSSA as well, because we force the split point to be after any PHI nodes.
   if (LI)
     if (Loop *L = LI->getLoopFor(Old))
       L->addBasicBlockToLoop(New, *LI);

 /// preserve LoopSimplify (because it's complicated to handle the case where one
 /// of the edges being split is an exit of a loop with other exits).
 ///
 BasicBlock *llvm::SplitBlockPredecessors(BasicBlock *BB,
                                          ArrayRef<BasicBlock *> Preds,
                                          const char *Suffix, AliasAnalysis *AA,
                                          DominatorTree *DT, LoopInfo *LI,
                                          bool PreserveLCSSA) {
+  // Do not attempt to split that which cannot be split.
+  if (!BB->isSplittable())
+    return nullptr;
+
   // For the landingpads we need to act a bit differently.
   // Delegate this work to the SplitLandingPadPredecessors.
   if (BB->isLandingPad()) {
     SmallVector<BasicBlock*, 2> NewBBs;
     std::string NewName = std::string(Suffix) + ".split-lp";
 
     SplitLandingPadPredecessors(BB, Preds, Suffix, NewName.c_str(),
                                 NewBBs, AA, DT, LI, PreserveLCSSA);

lib/Transforms/Utils/Local.cpp

 
 /// isInstructionTriviallyDead - Return true if the result produced by the
 /// instruction is not used, and the instruction has no side effects.
 ///
 bool llvm::isInstructionTriviallyDead(Instruction *I,
                                       const TargetLibraryInfo *TLI) {
   if (!I->use_empty() || isa<TerminatorInst>(I)) return false;
 
-  // We don't want the landingpad instruction removed by anything this general.
-  if (isa<LandingPadInst>(I))
+  // We don't want the landingpad-like instructions removed by anything this
+  // general.
+  if (I->isEHPad())
     return false;
 
   // We don't want debug info removed by anything this general, unless
   // debug info is empty.
   if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I)) {
     if (DDI->getAddress())
       return false;
     return true;

lib/Transforms/Utils/LoopSimplify.cpp

if (!L->contains(P)) {         // Coming in from outside the loop?
       OutsideBlocks.push_back(P);
     }
   }
 
   // Split out the loop pre-header.
   BasicBlock *PreheaderBB;
   PreheaderBB = SplitBlockPredecessors(Header, OutsideBlocks, ".preheader",
                                        AA, DT, LI, PreserveLCSSA);
+  if (!PreheaderBB)
+    return nullptr;
 
   DEBUG(dbgs() << "LoopSimplify: Creating pre-header "
                << PreheaderBB->getName() << "\n");
 
   // Make sure that NewBB is put someplace intelligent, which doesn't mess up
   // code layout too horribly.
   placeSplitBlockCarefully(PreheaderBB, OutsideBlocks, L);
 
static BasicBlock *rewriteLoopExitBlock(Loop *L, BasicBlock *Exit,
 
   assert(!LoopBlocks.empty() && "No edges coming in from outside the loop?");
   BasicBlock *NewExitBB = nullptr;
 
   bool PreserveLCSSA = PP->mustPreserveAnalysisID(LCSSAID);
 
   NewExitBB = SplitBlockPredecessors(Exit, LoopBlocks, ".loopexit", AA, DT,
                                      LI, PreserveLCSSA);
+  if (!NewExitBB)
+    return nullptr;
 
   DEBUG(dbgs() << "LoopSimplify: Creating dedicated exit block "
                << NewExitBB->getName() << "\n");
   return NewExitBB;
 }
 
 /// Add the specified block, and all of its predecessors, to the specified set,
 /// if it's not already in there.  Stop predecessor traversal when we reach
static Loop *separateNestedLoop(Loop *L, BasicBlock *Preheader,
                                 AliasAnalysis *AA, DominatorTree *DT,
                                 LoopInfo *LI, ScalarEvolution *SE, Pass *PP,
                                 AssumptionCache *AC) {
   // Don't try to separate loops without a preheader.
   if (!Preheader)
     return nullptr;
 
   // The header is not a landing pad; preheader insertion should ensure this.
-  assert(!L->getHeader()->isLandingPad() &&
-         "Can't insert backedge to landing pad");
+  BasicBlock *Header = L->getHeader();
+  assert(!Header->isLandingPad() && "Can't insert backedge to landing pad");
+  if (!Header->isSplittable())
+    return nullptr;
 
   PHINode *PN = findPHIToPartitionLoops(L, AA, DT, AC);
   if (!PN) return nullptr;  // No known way to partition.
 
   // Pull out all predecessors that have varying values in the loop.  This
   // handles the case when a PHI node has multiple instances of itself as
   // arguments.
   SmallVector<BasicBlock*, 8> OuterLoopPreds;
static Loop *separateNestedLoop(Loop *L, BasicBlock *Preheader,
   // If ScalarEvolution is around and knows anything about values in
   // this loop, tell it to forget them, because we're about to
   // substantially change it.
   if (SE)
     SE->forgetLoop(L);
 
   bool PreserveLCSSA = PP->mustPreserveAnalysisID(LCSSAID);
 
-  BasicBlock *Header = L->getHeader();
   BasicBlock *NewBB = SplitBlockPredecessors(Header, OuterLoopPreds, ".outer",
                                              AA, DT, LI, PreserveLCSSA);
 
   // Make sure that NewBB is put someplace intelligent, which doesn't mess up
   // code layout too horribly.
   placeSplitBlockCarefully(NewBB, OuterLoopPreds, L);
 
   // Create the new outer loop.

test/Feature/exception.ll

%exn = landingpad {i8*, i32}
             catch i8** @_ZTIc
             filter [2 x i8**] [i8** @_ZTIPKc, i8** @_ZTId]
   resume { i8*, i32 } %exn
 }
 
 declare void @_Z3quxv() optsize
 
 declare i32 @__gxx_personality_v0(...)
+
+define void @cleanupret0() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %bb
+bb:
+  cleanuppad void [i7 4]
+  cleanupret i8 0 unwind label %bb
+}
+
+define void @cleanupret1() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %bb
+bb:
+  cleanuppad void [i7 4]
+  cleanupret void unwind label %bb
+}
+
+define void @cleanupret2() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  cleanupret i8 0 unwind to caller
+}
+
+define void @cleanupret3() personality i32 (...)* @__gxx_personality_v0 {
+  cleanupret void unwind to caller
+}
+
+define void @catchret() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %bb
+bb:
+  catchret label %bb
+}
+
+define i8 @catchpad() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %bb2
+bb:
+  ret i8 %cbv
+bb2:
+  %cbv = catchpad i8 [i7 4] to label %bb unwind label %bb2
+}
+
+define void @terminatepad0() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %bb
+bb:
+  terminatepad [i7 4] unwind label %bb
+}
+
+define void @terminatepad1() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  terminatepad [i7 4] unwind to caller
+}
+
+define void @cleanuppad() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  cleanuppad void [i7 4]
+  ret void
+}
+
+define void @catchendpad0() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %bb
+bb:
+  catchendpad unwind label %bb
+}
+
+define void @catchendpad1() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  catchendpad unwind to caller
+}

test/Verifier/invoke.ll

 ; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s
 
 ; PR1042
 define i32 @foo() {
-; CHECK: The unwind destination does not have a landingpad instruction
+; CHECK: The unwind destination does not have an exception handling instruction
   %A = invoke i32 @foo( )
       to label %L unwind label %L   ; <i32> [#uses=1]
 L:    ; preds = %0, %0
   ret i32 %A
 }
 
 ; PR1042
 define i32 @bar() {
   br i1 false, label %L1, label %L2
 L1:   ; preds = %0
   %A = invoke i32 @bar( )
       to label %L unwind label %L   ; <i32> [#uses=1]
 L2:   ; preds = %0
   br label %L
 L:    ; preds = %L2, %L1, %L1
-; CHECK: The unwind destination does not have a landingpad instruction
+; CHECK: The unwind destination does not have an exception handling instruction
   ret i32 %A
 }
 
 
 declare i32 @__gxx_personality_v0(...)
 declare void @llvm.donothing()
 declare void @llvm.trap()
 declare i8 @llvm.expect.i8(i8,i8)

tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

default: return nullptr;
       STRINGIFY_CODE(FUNC_CODE, INST_INSERTELT)
       STRINGIFY_CODE(FUNC_CODE, INST_SHUFFLEVEC)
       STRINGIFY_CODE(FUNC_CODE, INST_CMP)
       STRINGIFY_CODE(FUNC_CODE, INST_RET)
       STRINGIFY_CODE(FUNC_CODE, INST_BR)
       STRINGIFY_CODE(FUNC_CODE, INST_SWITCH)
       STRINGIFY_CODE(FUNC_CODE, INST_INVOKE)
       STRINGIFY_CODE(FUNC_CODE, INST_UNREACHABLE)
+      STRINGIFY_CODE(FUNC_CODE, INST_CLEANUPRET)
+      STRINGIFY_CODE(FUNC_CODE, INST_CATCHRET)
+      STRINGIFY_CODE(FUNC_CODE, INST_CATCHPAD)
+      STRINGIFY_CODE(FUNC_CODE, INST_CATCHENDPAD)
+      STRINGIFY_CODE(FUNC_CODE, INST_TERMINATEPAD)
       STRINGIFY_CODE(FUNC_CODE, INST_PHI)
       STRINGIFY_CODE(FUNC_CODE, INST_ALLOCA)
       STRINGIFY_CODE(FUNC_CODE, INST_LOAD)
       STRINGIFY_CODE(FUNC_CODE, INST_VAARG)
       STRINGIFY_CODE(FUNC_CODE, INST_STORE)
       STRINGIFY_CODE(FUNC_CODE, INST_EXTRACTVAL)
       STRINGIFY_CODE(FUNC_CODE, INST_INSERTVAL)
       STRINGIFY_CODE(FUNC_CODE, INST_CMP2)