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.

[rnk]

docs/LangRef.rst

5185–5186

s/the function it is located in/its parent function/?

5187–5188

s/look for an appropriate catch block in the caller/continue processing exception handling actions in the caller/?

Also, the personality function isn't really responsible for moving to the caller, since the caller might have a different EH personality.

5194

s/constituent/preceding/?

5213–5214

This seems to be missing the restriction that exactly one catchblock must unwind to a catchendblock.

5254

s/transfer/transfers/

5304

Maybe add the void example:

cleanupret void unwind to caller

5316

The other instructions have the 'unwind to caller' form. Any reason not to list that here?

5323–5324

s/attempts to transfer control to terminate the program/may decide to terminate the program/?

5327–5328

s/if the terminateblock is an appropriate handler for the in-flight exception/if the personality routine decides not to terminate the program/?

5329–5331

I think we can drop this sentence from the overview.

5339–5340

Why? It might unwind to caller, consider a noexcept function.

8329

I wonder if we should just do Itanium and MSVC examples for every instruction, since together they motivate why the instructions have the flexibility that they do.

lib/IR/Verifier.cpp

2411–2412

Comment needs more edits for grammar:
Verify that the first non-PHI instruction of the unwind destination is an exception handling instruction.

lib/Transforms/Instrumentation/MemorySanitizer.cpp

2656–2674

Our new instructions may be void, and we don't need to set shadow memory for void instructions. As written, this fills the DenseMaps with a bunch of useless values. Let's avoid that.

[majnemer]

• Address Reid's review feedback.

[majnemer]

The latest revision should address these comments.

[JosephTremoulet]

I'm happy to see this coming online! I have some inline questions about the details.

docs/LangRef.rst

4730–4735

Missing cleanupret here

5123–5125

What should the exception label look like for a catch that is unconditionally entered (like catch(...) in C++)? Or do front-ends need to translate such things to cleanups?

5140

Is there also a restriction on the target of the exception label? E.g. that it must be a catchblock or catchendblock?

5144–5149

I'd imagine we're going to want a word for this set of three restrictions; we have a few of these and I expect some optimizations will want to know that these are in effect without caring which specific block type this is. I think I saw the term "unsplittable block" used for this in one of the discussions on the dev alias, which I like because the restriction is very similar to that of an unsplittable edge (i.e. you can't put code in it).

I'm not sure what's the right way to express that in these documents. E.g. should it just say "A catch block is unsplittable" and there's a glossary or something that can spell out what that means? Having an explicit section discussing unsplittable blocks may be warranted since it may be a construct that many aren't used to.

I think my best suggestion for now is to add a bullet that says "A catch block is 'unsplittable':" and then the bullets you have become sub-bullets of that (and likewise for the other unsplittable blocks).

5184

If we have

try {
   code;
   try {
     code;
   } catch (T e) {  // <--- catch 1
     MayThrow();
   }
   code;
} catch (T2 e2) {  // <---- catch 2
  code;
}

is the invoke for MayThrow supposed to target the catchbolck for catch2, or the catchendblock for catch1? If it's the catchendblock, having some verbiage here explaining that would be good.

5256

Mention that this reads and writes memory?

5263

That "unwind" shouldn't be there, should it?

5265

nit: You introduce cleanupret before you introduce cleanupblock; that reads strangely.

5275–5276

My impression from the RFC discussion was that cleanupret would also have a 'from' label indicating its cleanupblock (though I didn't see a reply to John's questions about that). What happened to that?

5289–5290

This implies that all cleanupblocks in a given function have the same result type; should that be mentioned as a restriction on cleanupblock and/or checked in the verifier?

5296–5297

Since cleanupblocks can nest, I think "one cleanupblock" would be more clear here than "the cleanupblock". Also s/transfered/transferred/.

8291–8292

I think you're missing some words here ("personality function upon re-entry to the function." is a fragment).

include/llvm/IR/Instructions.h

3804

s/invoke/catchblock/

3809

s/invoke/catchblock/

lib/AsmParser/LLParser.cpp

4997

s/cleanupret/terminateblock/

5025

s/cleanupret/catchendblock/

lib/IR/Instruction.cpp

468–471

Should there be a clause for TerminateBlock here?

lib/IR/Verifier.cpp

383–386

Nothing to check for CatchRet or CleanupRet? I think you could check that the CleanupRet unwind block is a (non-Landingpad?) EH block.

2840

Would be good to check that the unwind successor has an appropriate target (must be an EH block, can't be a LandingPad, I'm not sure if you're intending cleanupblock and/or terminateblock to be allowed).

2840

Check that all predecessors have exceptional terminators? Likewise for the other new EH blocks.

2857

Check here that this is the target of no more than one catchblock?

2857

If there's an unwind successor, it must be a (non-Landingpad?) EHBlock.

2890

If there's an unwind successor, it must be a (non-Landingpad?) EHBlock.

[JosephTremoulet]

Also, is there any new UB that should be spelled out in the documentation? E.g. can you return (from the function) from within a catchblock (without first executing catchret), and likewise for cleanups? Unwind from a catchblock to somewhere other than its catchendblock? Catchret from a cleanupblock or cleanupret from a catchblock?

[majnemer]

In D11041#201942, @JosephTremoulet wrote:

Also, is there any new UB that should be spelled out in the documentation? E.g. can you return (from the function) from within a catchblock (without first executing catchret), and likewise for cleanups? Unwind from a catchblock to somewhere other than its catchendblock? Catchret from a cleanupblock or cleanupret from a catchblock?

Yes, those should all be UB. I'll add them to the LangRef.

docs/LangRef.rst

5123–5125

The catchblock should unwind to a catchendblock in that case.

5140

Yes.

5184

MayThrow should unwind to the same catchendblock that "catch 1" will unwind to. That catchendblock would unwind to the outer catchblock.

5265

cleanupblock isn't a terminator and the terminators are all documented together :/

lib/IR/Instruction.cpp

468–471

I think TerminateBlock is more like a function-call which never returns and thus wouldn't throw.

[JosephTremoulet]

lib/IR/Instruction.cpp

468–471

The LangRef indicates that TerminateBlock might continue propagating the exception rather than never-return terminate the program (and it shouldn't need an unwind clause otherwise):

where a personality routine may decide 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.

So in the event that a TerminateBlock unwinds to caller and chooses not to terminate the program, does that count as "throw" for these purposes? To me it seems analogous to the catchendblock case.

[majnemer]

lib/IR/Instruction.cpp

468–471

Ah yes, I forgot the unwind to caller case.

[majnemer]

docs/LangRef.rst

5275–5276

We ended up believing we didn't need it.

5289–5290

This is implicit in the cleanupblock semantics section because the personality function chooses the result type and there can only be one personality function for a function.

And yes, the verifier should check this.

[majnemer]

• Address Reid's review feedback.
• Address Joseph's review comments.

[JosephTremoulet]

lib/IR/Verifier.cpp

2851–2853

The lang ref says catchblock must unwind to catchblock or catchendblock, but the check here is more permissive (allows cleanupblock and terminateblock).

[majnemer]

I accidentally committed this in r241888-r241891 and reverted those commits
in r241893. Apologies for the ensuing confusion.

[JosephTremoulet]

docs/LangRef.rst

5123–5125

That seems problematic. Doesn't that leave us without a way to indicate in the CFG that exceptions don't escape a catch-all? We'll definitely want to e.g. figure out when a handler has no incoming exceptions and can be removed (which could happen because there is an inner catch-all), or determine whether exceptions escape a function (to propagate that info up the call graph). Maybe EH-specific analyses like that could be expected to know about this and check whether a catchblock's arguments indicate catch-all for the given personality, but I expect we'll also want the information be visible to more generic analyses like reachability and dominance.
I'd like to offer a suggested change, but I'm not sure I fully understand what problem catchendblock is solving, so my first question would be what it's needed for and whether there's another way to solve that problem (the RFC just said "It is merely a placeholder to help reconstruct which invokes were part of the catch blocks of a try"; could that be computed by checking whether catchret is reachable from the invokes?). Barring that, it seems we'd want something like a catchallblock that isn't a terminator, doesn't have an unwind edge, and would have whatever the appropriate arguments are for a catchblock that catches everything; front-ends or an EH-aware transform could recognize when a catchblock catches everything and the catchendblock would have no other predecessors, and write the last catchblock as catchallblock (dropping the catchendblock) instead.

[rnk]

docs/LangRef.rst

5123–5125

It turns out that you need this edge in order to generate the right __CxxFrameHandler3 tables when catch-all is involved. Consider:

try { throw 1; }
catch (...) {
  try { throw; }
  catch (...) { throw; }
  }
}

The inner catch-all block unwinds to the catchendblock of the outer catch. This affects our planned EH state numbering algorithm.

Basically, I think that only EH-aware transforms should be allowed to do this kind of CFG simplification.

[JosephTremoulet]

docs/LangRef.rst

5123–5125

1. Regarding your specific example: Since the inner catch(...) re-throws, there's still unwind to out of the function (or at least the snippet); the inner catchendblock would have two predecessors, and I'm more concerned about cases where the artificial edge from the catchblock is the only predecessor of the catchendblock. Or in terms of the example, something more like this:

try { throw 1; }
catch (...) {
  try { throw; }
  catch (...) { /* nothing throws here */ }
  }
}

I'd like to be able to record that a function with that body doesn't unwind out of it.

2. Maybe I'd need more details on your planned EH state numbering algorithm, but the idea would be that you'd identify anywhere that you clone a catch-all into a handler, and consider the catch-all a child of that handler instead of top-level. Would that be doable?

3. I agree with this:

Basically, I think that only EH-aware transforms should be allowed to do this kind of CFG simplification.

So let's say I'm writing an EH-aware transform that knows my target has flexible EH reporting. What is the output of the CFG simplification that it performs? It seems to me that it doesn't have any valid way to simplify the CFG, that's the part that's concerning.

[reames]

Apparently, the contents of this review are now stale and future comments should go to D11097: New EH representation for MSVC compatibility. Mentioning this solely to avoid confusion on the part of future readers.

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:`catchblock <i_catchblock>`',
+':ref:`catchendblock <i_catchendblock>`',
+':ref:`catchret <i_catchret>`',
+':ref:`terminateblock <i_terminateblock>`',
+and ':ref:`unreachable <i_unreachable>`'.
 
 .. _i_ret:
 
 '``ret``' Instruction
 ^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""
 

 
 Example:
 """"""""
 
 .. code-block:: llvm
 
       resume { i8*, i32 } %exn
 
+.. _i_catchblock:
+
+'``catchblock``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      <resultval> = catchblock <resultty> [<args>*]
+          to label <normal label> unwind label <exception label>
+
+Overview:
+"""""""""
+
+The '``catchblock``' 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
+``catchblock`` 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 ``catchblock`` must be provided a ``normal`` label to transfer control
+to if the ``catchblock`` matches the exception and an ``exception``
+label to transfer control to if it doesn't.
+
+Semantics:
+""""""""""
+
+The '``catchblock``' 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 ``catchblock`` 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 ``catchblock`` 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 '``catchblock``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``catchblock``' instruction within the
+   catch block.
+-  A basic block that is not a catch block may not include a
+   '``catchblock``' instruction.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      ;; A catch block which can catch an integer.
+      %res = catchblock { i8*, i32 } [i8** @_ZTIi]
+        to label %int.handler unwind label %terminate
+
+.. _i_catchendblock:
+
+'``catchendblock``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      catchendblock unwind label <nextaction>
+      catchendblock unwind to caller
+
+Overview:
+"""""""""
+
+The '``catchendblock``' 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:`catchblock <i_catchblock>` instructions.
+
+The ``nextaction`` label indicates where control should transfer to if
+none of the ``catchblock`` instructions are suitable for catching the
+in-flight exception.
+
+If a ``nextaction`` label is not present, the instruction unwinds out of
+the function it is located in.  The
+:ref:`personality function <personalityfn>` will look for an appropriate
+catch block in the caller.
+
+Arguments:
+""""""""""
+
+The instruction optionally takes a label, ``nextaction``, indicating
+where control should transfer to if none of the constituent
+``catchblock`` 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 ``catchblock`` instructions match, then
+control is transfered to ``nextaction`` if it is present.  If it is not
+present, control is transfered to the caller.
+
+The ``catchendblock`` 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 '``catchendblock``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``catchendblock``' instruction within the
+   catch block.
+-  A basic block that is not a catch-end block may not include a
+   '``catchendblock``' instruction.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      catchendblock unwind label %terminate
+      catchendblock 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:`catchblock <i_catchblock>` instruction and transfer control to
+``normal``.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      catchret unwind 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 '``cleanupblock``' instruction in the same
+function.  It also has an optional successor,  ``continue``.
+
+Semantics:
+""""""""""
+
+The '``cleanupret``' instruction indicates to the
+:ref:`personality function <personalityfn>` that the
+:ref:`cleanupblock <i_cleanupblock>` it transfered control to has ended.
+It transfers control to ``continue`` or unwinds out of the function.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      cleanupret { i8*, i32 } %exn unwind label %continue
+
+.. _i_terminateblock:
+
+'``terminateblock``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      terminateblock [<args>*] unwind label <exception label>
+
+Overview:
+"""""""""
+
+The '``terminateblock``' 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 attempts to transfer
+control 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 tranfered to the ``exception`` label if the
+``terminateblock`` is an appropriate handler for the in-flight exception.
+If the ``terminateblock`` is not an appropriate handler, execution of
+the program is terminated via
+:ref:`personality function <personalityfn>` specific means.
+
+Arguments:
+""""""""""
+
+The instruction takes a list of arbitrary values which are interpreted
+by the :ref:`personality function <personalityfn>`.
+
+The ``terminateblock`` must be provided 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 ``terminateblock`` specifies what function the
+personality should defer to in order to terminate the program.
+
+The ``terminateblock`` 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 '``terminateblock``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``terminateblock``' instruction within the
+   terminate block.
+-  A basic block that is not a terminate block may not include a
+   '``terminateblock``' instruction.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      ;; A terminate block which only permits integers.
+      terminateblock [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_cleanupblock:
+
+'``cleanupblock``' Instruction
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      <resultval> = cleanupblock <resultty> [<args>*]
+
+Overview:
+"""""""""
+
+The '``cleanupblock``' 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.
+: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>`.
+
+Semantics:
+""""""""""
+
+The '``cleanupblock``' 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 ``cleanupblock`` 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
+``cleanupblock`` with the aid of the personality-specific arguments.
+
+The ``cleanupblock`` 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 '``cleanupblock``' instruction as its
+   first non-PHI instruction.
+-  There can be only one '``cleanupblock``' instruction within the
+   cleanup block.
+-  A basic block that is not a cleanup block may not include a
+   '``cleanupblock``' instruction.
+
+Example:
+""""""""
+
+.. code-block:: llvm
+
+      %res = cleanupblock { 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

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,
+  LLVMCatchBlock     = 63,
+  LLVMTerminateBlock = 64,
+  LLVMCleanupBlock   = 65,
+  LLVMCatchEndBlock  = 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(CleanupBlockInst)               \
       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(CatchBlockInst)               \
+        macro(TerminateBlockInst)           \
+        macro(CatchEndBlockInst)            \
       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_CATCHBLOCK  = 50, // CATCHBLOCK: [ty,val,val,num,args...]
+    FUNC_CODE_INST_TERMINATEBLOCK = 51, // TERMINATEBLOCK: [bb#,num,args...]
+    FUNC_CODE_INST_CLEANUPBLOCK = 52, // CLEANUPBLOCK: [num,args...]
+    FUNC_CODE_INST_CATCHENDBLOCK = 53, // CATCHENDBLOCK: [] 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 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 isEHBlock() const { return getFirstNonPHI()->isEHBlock(); }
+
   /// \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));
+  }
+
+  CatchBlockInst *CreateCatchBlock(Type *Ty, BasicBlock *NormalDest,
+                                   BasicBlock *UnwindDest,
+                                   ArrayRef<Value *> Args,
+                                   const Twine &Name = "") {
+    return Insert(CatchBlockInst::Create(Ty, NormalDest, UnwindDest, Args),
+                  Name);
+  }
+
+  CatchEndBlockInst *CreateCatchEndBlock(BasicBlock *UnwindBB = nullptr) {
+    return Insert(CatchEndBlockInst::Create(Context, UnwindBB));
+  }
+
+  TerminateBlockInst *CreateTerminateBlock(BasicBlock *NormalDest = nullptr,
+                                           ArrayRef<Value *> Args = {},
+                                           const Twine &Name = "") {
+    return Insert(TerminateBlockInst::Create(Context, NormalDest, Args), Name);
+  }
+
+  CleanupBlockInst *CreateCleanupBlock(Type *Ty, ArrayRef<Value *> Args,
+                                       const Twine &Name = "") {
+    return Insert(CleanupBlockInst::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 visitCatchBlockInst(CatchBlockInst &I)    { DELEGATE(TerminatorInst);}
+  RetTy visitCatchEndBlockInst(CatchEndBlockInst &I) { DELEGATE(TerminatorInst); }
+  RetTy visitTerminateBlockInst(TerminateBlockInst &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 visitCleanupBlockInst(CleanupBlockInst &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::CatchBlock:
+    case Instruction::CatchEndBlock:
+    case Instruction::CatchRet:
+    case Instruction::CleanupRet:
+    case Instruction::Invoke:
+    case Instruction::Resume:
+    case Instruction::TerminateBlock:
+      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 isEHBlock() const {
+    switch (getOpcode()) {
+    case Instruction::CatchBlock:
+    case Instruction::CatchEndBlock:
+    case Instruction::CleanupBlock:
+    case Instruction::LandingPad:
+    case Instruction::TerminateBlock:
+      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, CatchBlock    , CatchBlockInst)
+HANDLE_TERM_INST  (11, TerminateBlock, TerminateBlockInst)
+HANDLE_TERM_INST  (12, CatchEndBlock , CatchEndBlockInst)
+  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, CleanupBlock, CleanupBlockInst)
+  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)
+
+//===----------------------------------------------------------------------===//
+//                               CatchEndBlockInst Class
+//===----------------------------------------------------------------------===//
+
+class CatchEndBlockInst : public TerminatorInst {
+  CatchEndBlockInst(const CatchEndBlockInst &RI);
+
+private:
+  void init(BasicBlock *UnwindBB);
+  CatchEndBlockInst(LLVMContext &C, BasicBlock *UnwindBB, unsigned Values,
+                    Instruction *InsertBefore = nullptr);
+  CatchEndBlockInst(LLVMContext &C, BasicBlock *UnwindBB, unsigned Values,
+                    BasicBlock *InsertAtEnd);
+
+protected:
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+  CatchEndBlockInst *cloneImpl() const;
+
+public:
+  static CatchEndBlockInst *Create(LLVMContext &C,
+                                   BasicBlock *UnwindBB = nullptr,
+                                   Instruction *InsertBefore = nullptr) {
+    unsigned Values = UnwindBB ? 1 : 0;
+    return new (Values) CatchEndBlockInst(C, UnwindBB, Values, InsertBefore);
+  }
+  static CatchEndBlockInst *Create(LLVMContext &C, BasicBlock *UnwindBB,
+                                   BasicBlock *InsertAtEnd) {
+    unsigned Values = UnwindBB ? 1 : 0;
+    return new (Values) CatchEndBlockInst(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 cast<BasicBlock>(Op<-1>()); }
+  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::CatchEndBlock);
+  }
+  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<CatchEndBlockInst>
+    : public VariadicOperandTraits<CatchEndBlockInst> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CatchEndBlockInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                           CatchBlockInst Class
+//===----------------------------------------------------------------------===//
+
+class CatchBlockInst : public TerminatorInst {
+private:
+  void init(BasicBlock *IfNormal, BasicBlock *IfException,
+            ArrayRef<Value *> Args, const Twine &NameStr);
+
+  CatchBlockInst(const CatchBlockInst &CBI);
+
+  explicit CatchBlockInst(Type *RetTy, BasicBlock *IfNormal,
+                          BasicBlock *IfException, ArrayRef<Value *> Args,
+                          unsigned Values, const Twine &NameStr,
+                          Instruction *InsertBefore);
+  explicit CatchBlockInst(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;
+  CatchBlockInst *cloneImpl() const;
+
+public:
+  static CatchBlockInst *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) CatchBlockInst(RetTy, IfNormal, IfException, Args,
+                                       Values, NameStr, InsertBefore);
+  }
+  static CatchBlockInst *Create(Type *RetTy, BasicBlock *IfNormal,
+                                BasicBlock *IfException, ArrayRef<Value *> Args,
+                                const Twine &NameStr, BasicBlock *InsertAtEnd) {
+    unsigned Values = unsigned(Args.size()) + 2;
+    return new (Values) CatchBlockInst(RetTy, IfNormal, IfException, Args,
+                                       Values, NameStr, InsertAtEnd);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  /// getNumArgOperands - Return the number of catchblock arguments.
+  ///
+  unsigned getNumArgOperands() const { return getNumOperands() - 2; }
+
+  /// getArgOperand/setArgOperand - Return/set the i-th catchblock 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 catchblock 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 invoke!");
+    return i == 0 ? getNormalDest() : getUnwindDest();
+  }
+
+  void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
+    assert(idx < 2 && "Successor # out of range for invoke!");
+    *(&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::CatchBlock;
+  }
+  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<CatchBlockInst>
+    : public VariadicOperandTraits<CatchBlockInst, /*MINARITY=*/2> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CatchBlockInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                           TerminateBlockInst Class
+//===----------------------------------------------------------------------===//
+
+class TerminateBlockInst : public TerminatorInst {
+private:
+  void init(BasicBlock *BB, ArrayRef<Value *> Args, const Twine &NameStr);
+
+  TerminateBlockInst(const TerminateBlockInst &TBI);
+
+  explicit TerminateBlockInst(LLVMContext &C, BasicBlock *BB,
+                              ArrayRef<Value *> Args, unsigned Values,
+                              const Twine &NameStr, Instruction *InsertBefore);
+  explicit TerminateBlockInst(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;
+  TerminateBlockInst *cloneImpl() const;
+
+public:
+  static TerminateBlockInst *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)
+        TerminateBlockInst(C, BB, Args, Values, NameStr, InsertBefore);
+  }
+  static TerminateBlockInst *Create(LLVMContext &C, BasicBlock *BB,
+                                    ArrayRef<Value *> Args,
+                                    const Twine &NameStr,
+                                    BasicBlock *InsertAtEnd) {
+    unsigned Values = unsigned(Args.size());
+    if (BB)
+      ++Values;
+    return new (Values)
+        TerminateBlockInst(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 terminateblock arguments.
+  ///
+  unsigned getNumArgOperands() const {
+    unsigned NumOperands = getNumOperands();
+    if (hasUnwindDest())
+      return NumOperands - 1;
+    return NumOperands;
+  }
+
+  /// getArgOperand/setArgOperand - Return/set the i-th terminateblock 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 terminateblock 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::TerminateBlock;
+  }
+  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<TerminateBlockInst>
+    : public VariadicOperandTraits<TerminateBlockInst, /*MINARITY=*/1> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(TerminateBlockInst, Value)
+
+//===----------------------------------------------------------------------===//
+//                           CleanupBlockInst Class
+//===----------------------------------------------------------------------===//
+
+class CleanupBlockInst : public Instruction {
+private:
+  void init(ArrayRef<Value *> Args, const Twine &NameStr);
+
+  CleanupBlockInst(const CleanupBlockInst &TBI);
+
+  explicit CleanupBlockInst(Type *RetTy, ArrayRef<Value *> Args,
+                            const Twine &NameStr, Instruction *InsertBefore);
+  explicit CleanupBlockInst(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;
+  CleanupBlockInst *cloneImpl() const;
+
+public:
+  static CleanupBlockInst *Create(Type *RetTy, ArrayRef<Value *> Args,
+                                  const Twine &NameStr = "",
+                                  Instruction *InsertBefore = nullptr) {
+    return new (Args.size())
+        CleanupBlockInst(RetTy, Args, NameStr, InsertBefore);
+  }
+  static CleanupBlockInst *Create(Type *RetTy, ArrayRef<Value *> Args,
+                                  const Twine &NameStr,
+                                  BasicBlock *InsertAtEnd) {
+    return new (Args.size())
+        CleanupBlockInst(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::CleanupBlock;
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+};
+
+template <>
+struct OperandTraits<CleanupBlockInst>
+    : public VariadicOperandTraits<CleanupBlockInst, /*MINARITY=*/0> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CleanupBlockInst, 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/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(catchblock,     CatchBlock);
+  INSTKEYWORD(terminateblock, TerminateBlock);
+  INSTKEYWORD(cleanupblock,   CleanupBlock);
+  INSTKEYWORD(catchendblock,  CatchEndBlock);
 #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 ParseCatchBlock(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseTerminateBlock(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCleanupBlock(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCatchEndBlock(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_catchblock:  return ParseCatchBlock(Inst, PFS);
+  case lltok::kw_terminateblock: return ParseTerminateBlock(Inst, PFS);
+  case lltok::kw_cleanupblock: return ParseCleanupBlock(Inst, PFS);
+  case lltok::kw_catchendblock: return ParseCatchEndBlock(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 cleanupblock"))
+    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;
+}
+
+/// ParseCatchBlock
+///   ::= 'catchblock' Type ParamList 'to' TypeAndValue 'unwind' TypeAndValue
+bool LLParser::ParseCatchBlock(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 catchblock") ||
+      ParseTypeAndBasicBlock(NormalBB, PFS) ||
+      ParseToken(lltok::kw_unwind, "expected 'unwind' in catchblock") ||
+      ParseTypeAndBasicBlock(UnwindBB, PFS))
+    return true;
+
+  Inst = CatchBlockInst::Create(RetType, NormalBB, UnwindBB, Args);
+  return false;
+}
+
+/// ParseTerminateBlock
+///   ::= 'terminateblock' ParamList 'to' TypeAndValue
+bool LLParser::ParseTerminateBlock(Instruction *&Inst, PerFunctionState &PFS) {
+  SmallVector<Value *, 8> Args;
+  if (ParseExceptionArgs(Args, PFS))
+    return true;
+
+  if (ParseToken(lltok::kw_unwind, "expected 'unwind' in terminateblock"))
+    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 = TerminateBlockInst::Create(Context, UnwindBB, Args);
+  return false;
+}
+
+/// ParseCleanupBlock
+///   ::= 'cleanupblock' ParamList
+bool LLParser::ParseCleanupBlock(Instruction *&Inst, PerFunctionState &PFS) {
+  Type *RetType = nullptr;
+
+  SmallVector<Value *, 8> Args;
+  if (ParseType(RetType, /*AllowVoid=*/true) || ParseExceptionArgs(Args, PFS))
+    return true;
+
+  Inst = CleanupBlockInst::Create(RetType, Args);
+  return false;
+}
+
+/// ParseCatchEndBlock
+///   ::= 'catchendblock' unwind ('to' 'caller' | TypeAndValue)
+bool LLParser::ParseCatchEndBlock(Instruction *&Inst, PerFunctionState &PFS) {
+  if (ParseToken(lltok::kw_unwind, "expected 'unwind' in cleanupret"))
+    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 = CatchEndBlockInst::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_catchblock,
+    kw_terminateblock, kw_cleanupblock, kw_catchendblock,
 
     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_CATCHBLOCK: { // CATCHBLOCK: [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 = CatchBlockInst::Create(Ty, NormalBB, UnwindBB, Args);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_TERMINATEBLOCK: { // TERMINATEBLOCK: [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 = TerminateBlockInst::Create(Context, UnwindDest, Args);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_CLEANUPBLOCK: { // CLEANUPBLOCK: [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 = CleanupBlockInst::Create(Ty, Args);
+      InstructionList.push_back(I);
+      break;
+    }
+    case bitc::FUNC_CODE_INST_CATCHENDBLOCK: { // CATCHENDBLOCKINST: [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 = CatchEndBlockInst::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::CatchBlock: {
+    Code = bitc::FUNC_CODE_INST_CATCHBLOCK;
+    const auto &CBI = cast<CatchBlockInst>(I);
+    Vals.push_back(VE.getTypeID(CBI.getType()));
+    Vals.push_back(VE.getValueID(CBI.getNormalDest()));
+    Vals.push_back(VE.getValueID(CBI.getUnwindDest()));
+    unsigned NumArgOperands = CBI.getNumArgOperands();
+    Vals.push_back(NumArgOperands);
+    for (unsigned Op = 0; Op != NumArgOperands; ++Op)
+      PushValueAndType(CBI.getArgOperand(Op), InstID, Vals, VE);
+    break;
+  }
+  case Instruction::TerminateBlock: {
+    Code = bitc::FUNC_CODE_INST_TERMINATEBLOCK;
+    const auto &TBI = cast<TerminateBlockInst>(I);
+    Vals.push_back(TBI.hasUnwindDest());
+    if (TBI.hasUnwindDest())
+      Vals.push_back(VE.getValueID(TBI.getUnwindDest()));
+    unsigned NumArgOperands = TBI.getNumArgOperands();
+    Vals.push_back(NumArgOperands);
+    for (unsigned Op = 0; Op != NumArgOperands; ++Op)
+      PushValueAndType(TBI.getArgOperand(Op), InstID, Vals, VE);
+    break;
+  }
+  case Instruction::CleanupBlock: {
+    Code = bitc::FUNC_CODE_INST_CLEANUPBLOCK;
+    const auto &CBI = cast<CleanupBlockInst>(I);
+    Vals.push_back(VE.getTypeID(CBI.getType()));
+    unsigned NumOperands = CBI.getNumOperands();
+    Vals.push_back(NumOperands);
+    for (unsigned Op = 0; Op != NumOperands; ++Op)
+      PushValueAndType(CBI.getOperand(Op), InstID, Vals, VE);
+    break;
+  }
+  case Instruction::CatchEndBlock: {
+    Code = bitc::FUNC_CODE_INST_CATCHENDBLOCK;
+    const auto &CEBI = cast<CatchEndBlockInst>(I);
+    if (CEBI.hasUnwindDest())
+      Vals.push_back(VE.getValueID(CEBI.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 visitCatchEndBlock(const CatchEndBlockInst &I);
+  void visitCatchRet(const CatchReturnInst &I);
+  void visitCatchBlock(const CatchBlockInst &I);
+  void visitTerminateBlock(const TerminateBlockInst &TBI);
+  void visitCleanupBlock(const CleanupBlockInst &CBI);
 
   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

if (const Instruction *Inst = dyn_cast<Instruction>(V)) {
     RegsForValue RFV(*DAG.getContext(), TLI, 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::visitCatchEndBlock(const CatchEndBlockInst &I) {
+  report_fatal_error("visitCatchEndBlock not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCatchRet(const CatchReturnInst &I) {
+  report_fatal_error("visitCatchRet not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCatchBlock(const CatchBlockInst &I) {
+  report_fatal_error("visitCatchBlock not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitTerminateBlock(const TerminateBlockInst &TBI) {
+  report_fatal_error("visitTerminateBlock not yet implemented!");
+}
+
+void SelectionDAGBuilder::visitCleanupBlock(const CleanupBlockInst &TBI) {
+  report_fatal_error("visitCleanupBlock not yet implemented!");
+}
+
 void SelectionDAGBuilder::visitRet(const ReturnInst &I) {
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
   SDValue Chain = getControlRoot();
   SmallVector<ISD::OutputArg, 8> Outs;
   SmallVector<SDValue, 8> OutVals;
 
   if (!FuncInfo.CanLowerReturn) {
     unsigned DemoteReg = FuncInfo.DemoteRegister;

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 CatchEndBlock:  return 0;
+  case CatchRet:       return 0;
+  case CatchBlock:     return 0;
+  case TerminateBlock: return 0;
+  case CleanupBlock:   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 *CBI = dyn_cast<CatchBlockInst>(&I)) {
+    Out << ' ';
+    TypePrinter.print(I.getType(), Out);
+
+    Out << " [";
+    for (unsigned Op = 0, NumOps = CBI->getNumArgOperands(); Op < NumOps;
+         ++Op) {
+      if (Op > 0)
+        Out << ", ";
+      writeOperand(CBI->getArgOperand(Op), /*PrintType=*/true);
+    }
+    Out << "] to ";
+    writeOperand(CBI->getNormalDest(), /*PrintType=*/true);
+    Out << " unwind ";
+    writeOperand(CBI->getUnwindDest(), /*PrintType=*/true);
+  } else if (const auto *TBI = dyn_cast<TerminateBlockInst>(&I)) {
+    Out << " [";
+    for (unsigned Op = 0, NumOps = TBI->getNumArgOperands(); Op < NumOps;
+         ++Op) {
+      if (Op > 0)
+        Out << ", ";
+      writeOperand(TBI->getArgOperand(Op), /*PrintType=*/true);
+    }
+    Out << "] unwind ";
+    if (TBI->hasUnwindDest())
+      writeOperand(TBI->getUnwindDest(), /*PrintType=*/true);
+    else
+      Out << "to caller";
+  } else if (const auto *CBI = dyn_cast<CleanupBlockInst>(&I)) {
+    Out << ' ';
+    TypePrinter.print(I.getType(), Out);
+
+    Out << " [";
+    for (unsigned Op = 0, NumOps = CBI->getNumOperands(); Op < NumOps; ++Op) {
+      if (Op > 0)
+        Out << ", ";
+      writeOperand(CBI->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 *CEBI = dyn_cast<CatchEndBlockInst>(&I)) {
+    Out << " unwind ";
+    if (CEBI->hasUnwindDest())
+      writeOperand(CEBI->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->isEHBlock()) ++InsertPt;
   return InsertPt;
 }
 
 void BasicBlock::dropAllReferences() {
   for(iterator I = begin(), E = end(); I != E; ++I)
     I->dropAllReferences();
 }
 

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 CatchEndBlock: return "catchendblock";
+  case CatchRet: return "catchret";
+  case CatchBlock: return "catchblock";
+  case TerminateBlock: return "terminateblock";
 
   // 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 CleanupBlock:   return "cleanupblock";
 
   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::TerminateBlock:
     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::TerminateBlock:
     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 *CEBI = dyn_cast<CatchEndBlockInst>(this))
+    return CEBI->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);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CatchEndBlockInst Implementation
+//===----------------------------------------------------------------------===//
+
+CatchEndBlockInst::CatchEndBlockInst(const CatchEndBlockInst &CRI)
+    : TerminatorInst(CRI.getType(), Instruction::CatchEndBlock,
+                     OperandTraits<CatchEndBlockInst>::op_end(this) -
+                         CRI.getNumOperands(),
+                     CRI.getNumOperands()) {
+  SubclassOptionalData = CRI.SubclassOptionalData;
+  if (BasicBlock *UnwindDest = CRI.getUnwindDest())
+    setUnwindDest(UnwindDest);
+}
+
+void CatchEndBlockInst::init(BasicBlock *UnwindBB) {
+  SubclassOptionalData = 0;
+  if (UnwindBB) {
+    setInstructionSubclassData(getSubclassDataFromInstruction() | 1);
+    setUnwindDest(UnwindBB);
+  }
+}
+
+CatchEndBlockInst::CatchEndBlockInst(LLVMContext &C, BasicBlock *UnwindBB,
+                                     unsigned Values, Instruction *InsertBefore)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::CatchEndBlock,
+                     OperandTraits<CatchEndBlockInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(UnwindBB);
+}
+
+CatchEndBlockInst::CatchEndBlockInst(LLVMContext &C, BasicBlock *UnwindBB,
+                                     unsigned Values, BasicBlock *InsertAtEnd)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::CatchEndBlock,
+                     OperandTraits<CatchEndBlockInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(UnwindBB);
+}
+
+BasicBlock *CatchEndBlockInst::getSuccessorV(unsigned Idx) const {
+  assert(Idx == 0);
+  return getUnwindDest();
+}
+unsigned CatchEndBlockInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void CatchEndBlockInst::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);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CatchBlockInst Implementation
+//===----------------------------------------------------------------------===//
+void CatchBlockInst::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);
+}
+
+CatchBlockInst::CatchBlockInst(const CatchBlockInst &CBI)
+    : TerminatorInst(CBI.getType(), Instruction::CatchBlock,
+                     OperandTraits<CatchBlockInst>::op_end(this) -
+                         CBI.getNumOperands(),
+                     CBI.getNumOperands()) {
+  std::copy(CBI.op_begin(), CBI.op_end(), op_begin());
+}
+
+CatchBlockInst::CatchBlockInst(Type *RetTy, BasicBlock *IfNormal,
+                               BasicBlock *IfException, ArrayRef<Value *> Args,
+                               unsigned Values, const Twine &NameStr,
+                               Instruction *InsertBefore)
+    : TerminatorInst(RetTy, Instruction::CatchBlock,
+                     OperandTraits<CatchBlockInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(IfNormal, IfException, Args, NameStr);
+}
+
+CatchBlockInst::CatchBlockInst(Type *RetTy, BasicBlock *IfNormal,
+                               BasicBlock *IfException, ArrayRef<Value *> Args,
+                               unsigned Values, const Twine &NameStr,
+                               BasicBlock *InsertAtEnd)
+    : TerminatorInst(RetTy, Instruction::CatchBlock,
+                     OperandTraits<CatchBlockInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(IfNormal, IfException, Args, NameStr);
+}
+
+BasicBlock *CatchBlockInst::getSuccessorV(unsigned Idx) const {
+  return getSuccessor(Idx);
+}
+unsigned CatchBlockInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void CatchBlockInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  return setSuccessor(Idx, B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        TerminateBlockInst Implementation
+//===----------------------------------------------------------------------===//
+void TerminateBlockInst::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);
+}
+
+TerminateBlockInst::TerminateBlockInst(const TerminateBlockInst &TBI)
+    : TerminatorInst(TBI.getType(), Instruction::TerminateBlock,
+                     OperandTraits<TerminateBlockInst>::op_end(this) -
+                         TBI.getNumOperands(),
+                     TBI.getNumOperands()) {
+  SubclassOptionalData = TBI.SubclassOptionalData;
+  std::copy(TBI.op_begin(), TBI.op_end(), op_begin());
+}
+
+TerminateBlockInst::TerminateBlockInst(LLVMContext &C, BasicBlock *BB,
+                                       ArrayRef<Value *> Args, unsigned Values,
+                                       const Twine &NameStr,
+                                       Instruction *InsertBefore)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::TerminateBlock,
+                     OperandTraits<TerminateBlockInst>::op_end(this) - Values,
+                     Values, InsertBefore) {
+  init(BB, Args, NameStr);
+}
+
+TerminateBlockInst::TerminateBlockInst(LLVMContext &C, BasicBlock *BB,
+                                       ArrayRef<Value *> Args, unsigned Values,
+                                       const Twine &NameStr,
+                                       BasicBlock *InsertAtEnd)
+    : TerminatorInst(Type::getVoidTy(C), Instruction::TerminateBlock,
+                     OperandTraits<TerminateBlockInst>::op_end(this) - Values,
+                     Values, InsertAtEnd) {
+  init(BB, Args, NameStr);
+}
+
+BasicBlock *TerminateBlockInst::getSuccessorV(unsigned Idx) const {
+  assert(Idx == 0);
+  return getUnwindDest();
+}
+unsigned TerminateBlockInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+void TerminateBlockInst::setSuccessorV(unsigned Idx, BasicBlock *B) {
+  assert(Idx == 0);
+  return setUnwindDest(B);
+}
+
+//===----------------------------------------------------------------------===//
+//                        CleanupBlockInst Implementation
+//===----------------------------------------------------------------------===//
+void CleanupBlockInst::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);
+}
+
+CleanupBlockInst::CleanupBlockInst(const CleanupBlockInst &CBI)
+    : Instruction(CBI.getType(), Instruction::CleanupBlock,
+                  OperandTraits<CleanupBlockInst>::op_end(this) -
+                      CBI.getNumOperands(),
+                  CBI.getNumOperands()) {
+  std::copy(CBI.op_begin(), CBI.op_end(), op_begin());
+}
+
+CleanupBlockInst::CleanupBlockInst(Type *RetTy, ArrayRef<Value *> Args,
+                                   const Twine &NameStr,
+                                   Instruction *InsertBefore)
+    : Instruction(RetTy, Instruction::CleanupBlock,
+                  OperandTraits<CleanupBlockInst>::op_end(this) - Args.size(),
+                  Args.size(), InsertBefore) {
+  init(Args, NameStr);
+}
+
+CleanupBlockInst::CleanupBlockInst(Type *RetTy, ArrayRef<Value *> Args,
+                                   const Twine &NameStr,
+                                   BasicBlock *InsertAtEnd)
+    : Instruction(RetTy, Instruction::CleanupBlock,
+                  OperandTraits<CleanupBlockInst>::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);
+}
+
+CatchEndBlockInst *CatchEndBlockInst::cloneImpl() const {
+  return new (getNumOperands()) CatchEndBlockInst(*this);
+}
+
+CatchReturnInst *CatchReturnInst::cloneImpl() const {
+  return new (1) CatchReturnInst(*this);
+}
+
+CatchBlockInst *CatchBlockInst::cloneImpl() const {
+  return new (getNumOperands()) CatchBlockInst(*this);
+}
+
+TerminateBlockInst *TerminateBlockInst::cloneImpl() const {
+  return new (getNumOperands()) TerminateBlockInst(*this);
+}
+
+CleanupBlockInst *CleanupBlockInst::cloneImpl() const {
+  return new (getNumOperands()) CleanupBlockInst(*this);
+}
+
 UnreachableInst *UnreachableInst::cloneImpl() const {
   LLVMContext &Context = getContext();
   return new UnreachableInst(Context);
 }

lib/IR/Verifier.cpp

#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 visitCatchBlockInst(CatchBlockInst &CBI);
+  void visitCatchEndBlockInst(CatchEndBlockInst &CEBI);
+  void visitCleanupBlockInst(CleanupBlockInst &CBI);
+  void visitTerminateBlockInst(TerminateBlockInst &TBI);
 
   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
+  // Verify that there is an exception block instruction is the first non-PHI
   // instruction of the 'unwind' destination.
-  Assert(II.getUnwindDest()->isLandingPad(),
-         "The unwind destination does not have a landingpad instruction!", &II);
+  Assert(
+      II.getUnwindDest()->isEHBlock(),
+      "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) {
if (LPI.isCatch(i)) {
       Assert(isa<ConstantArray>(Clause) || isa<ConstantAggregateZero>(Clause),
              "Filter operand is not an array of constants!", &LPI);
     }
   }
 
   visitInstruction(LPI);
 }
 
+void Verifier::visitCatchBlockInst(CatchBlockInst &CBI) {
+  BasicBlock *BB = CBI.getParent();
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "CatchBlockInst needs to be in a function with a personality.", &CBI);
+
+  // The catchblock instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &CBI,
+         "CatchBlockInst not the first non-PHI instruction in the block.",
+         &CBI);
+
+  visitTerminatorInst(CBI);
+}
+
+void Verifier::visitCatchEndBlockInst(CatchEndBlockInst &CEBI) {
+  BasicBlock *BB = CEBI.getParent();
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "CatchEndBlockInst needs to be in a function with a personality.",
+         &CEBI);
+
+  // The catchendblock instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &CEBI,
+         "CatchEndBlockInst not the first non-PHI instruction in the block.",
+         &CEBI);
+
+  visitTerminatorInst(CEBI);
+}
+
+void Verifier::visitCleanupBlockInst(CleanupBlockInst &CBI) {
+  BasicBlock *BB = CBI.getParent();
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "CleanupBlockInst needs to be in a function with a personality.", &CBI);
+
+  // The cleanupblock instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &CBI,
+         "CleanupBlockInst not the first non-PHI instruction in the block.",
+         &CBI);
+
+  visitInstruction(CBI);
+}
+
+void Verifier::visitTerminateBlockInst(TerminateBlockInst &TBI) {
+  BasicBlock *BB = TBI.getParent();
+
+  Function *F = BB->getParent();
+  Assert(F->hasPersonalityFn(),
+         "TerminateBlockInst needs to be in a function with a personality.",
+         &TBI);
+
+  // The terminateblock instruction must be the first non-PHI instruction in the
+  // block.
+  Assert(BB->getFirstNonPHI() == &TBI,
+         "TerminateBlockInst not the first non-PHI instruction in the block.",
+         &TBI);
+
+  visitTerminatorInst(TBI);
+}
+
 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 visitCleanupBlockInst(CleanupBlockInst &I) {
+    setShadow(&I, getCleanShadow(&I));
+    setOrigin(&I, getCleanOrigin());
+  }
+
+  void visitCatchBlock(CatchBlockInst &I) {
+    setShadow(&I, getCleanShadow(&I));
+    setOrigin(&I, getCleanOrigin());
+  }
+
+  void visitTerminateBlock(TerminateBlockInst &I) {
+    setShadow(&I, getCleanShadow(&I));
+    setOrigin(&I, getCleanOrigin());
+  }
+
+  void visitCatchEndBlockInst(CatchEndBlockInst &I) {
+    setShadow(&I, getCleanShadow(&I));
+    setOrigin(&I, getCleanOrigin());
+  }
+
   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.isEHBlock() ||
+        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->isEHBlock() ||
+         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;
     }

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->isEHBlock())
     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;

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:
+  cleanupret i8 0 unwind label %bb
+bb:
+  ret void
+}
+
+define void @cleanupret1() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  cleanupret void unwind label %bb
+bb:
+  ret void
+}
+
+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 @catchblock() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  %cbv = catchblock i8 [i7 4] to label %bb unwind label %bb2
+bb:
+  ret i8 %cbv
+bb2:
+  ret i8 42
+}
+
+define void @terminateblock0() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  terminateblock [i7 4] unwind label %bb
+bb:
+  ret void
+}
+
+define void @terminateblock1() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  terminateblock [i7 4] unwind to caller
+}
+
+define void @cleanupblock() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  cleanupblock void [i7 4]
+  ret void
+}
+
+define void @catchendblock0() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  catchendblock unwind label %bb
+bb:
+  ret void
+}
+
+define void @catchendblock1() personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  catchendblock 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_CATCHBLOCK)
+      STRINGIFY_CODE(FUNC_CODE, INST_CATCHENDBLOCK)
+      STRINGIFY_CODE(FUNC_CODE, INST_TERMINATEBLOCK)
       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)