Enable invoking the patchpoint intrinsic

[kmod]

Summary

Split into three commits:

Reduce code duplication between patchpoint and non-patchpoint lowering. NFC.
Enable invoking the patchpoint intrinsic
Fix an over-negation bug.

[kmod]

Remove the refactoring changes from this CR to move to a separate one

Just noticed that phabricator doesn't let you view the per-commit diffs,
so separating this into separate phabricator revisions

[kmod]

Forgot to include changes to Intrinsics.td specifying that patchpoints can now throw

Otherwise the optimizer would just convert the invokes back to calls.

[ributzka]

Just a few coding style nitpicks inline.

I will take a closer look tomorrow and also run it through our test suite to see if there any regressions.

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

2018–2032

We usually don't use brackets for single-statement bodies

2033–2042

The switch statement and its cases have the same indentation.

2044–2046

ditto

[kmod]

Fix formatting

[ributzka]

Hi Kevin,

the patch doesn’t seem to be against trunk. Could you please post an updated patch against trunk?
There seem to be also a lot of changes due to threading through ‘ImmutableCallSite’. I didn’t see in this patch why this is necessary?

Cheers,
Juergen

[kmod]

Rebase onto trunk (r219719)

[kmod]

Ok, I rebased onto trunk. One thing I failed to mention is that this patch depends on another that I sent out, D5657, since I wanted to separate some refactoring changes from the actual invoke-supporting change.

I switched from a CallInst to an ImmutableCallSite since these functions can now take either a CallInst or an InvokeInst (specifically, visitPatchpoint can now be called from both visitIntrinsicCall and from visitInvoke), and my understanding was that an (Immutable)CallSite is the preferred way to support both. Happy to do it some other way, though.

[ributzka]

Oh, that explains it. I wasn’t aware this patch depended on D5657.

[ributzka]

I still think not threading through ImmutableCallSite would be nicer and reduce unnecessary changes. Otherwise LGTM.

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

637–644

While you are already at it, could you please clean up the sins I committed and update it to the current coding standard (camelCase for functions and CamelCase for variables)?

784

I would add a default value for LandingPad = nullptr and not switch to ImmutableCallSite for the first argument.

[kmod]

Ok I will update the patch, but I'm not sure how you mean to not thread
through the ImmutableCallSite, since I thought InvokeInst is not a subclass
of CallInst?

[ributzka]

Oh, I see. Never mind then.

[kmod]

Update based on review comments

[ributzka]

The patch didn't apply cleanly against trunk. I merged it, but now the test case is failing for me. The test case is very fragile, because it relies on temporary labels. I think you can get rid of most of these checks.

[kmod]

Try to fix the target triple and make the intent of the test more clear

[kmod]

Try to make the test a little bit less brittle.

I would like to check that the exception data covers
the entirety of the patchpoint region since that was something
I was worried about, so I tried to make it do so a little bit less
brittle-ly.

[kmod]

Ok I rebased onto r220027, but the test is passing for me. Not that that's really a good sign for the test's robustness, but I'm curious now why it's failing. I noticed that I had used a different triple than all of the other tests used so I fixed that -- I wonder if that makes it pass for you? I'm assuming you're running this on a mac so that an incorrectly-specified triple could cause issues since this assumes ELF.

Separately, I also tried to make the test less brittle by getting rid of as many hard-coded label names as I could, but I couldn't get rid of the Ltmp0 one. I wanted to check to make sure the exception data covers the entire patchpoint, since that was one of my worries going into this, though now that I understand the code better I'd be more ok with taking that out.

[ributzka]

Closed by commit rL220055 (authored by @ributzka).

include/llvm/IR/Intrinsics.td

 //===------------------------ Stackmap Intrinsics -------------------------===//
 //
 def int_experimental_stackmap : Intrinsic<[],
                                   [llvm_i64_ty, llvm_i32_ty, llvm_vararg_ty],
                                   [Throws]>;
 def int_experimental_patchpoint_void : Intrinsic<[],
                                                  [llvm_i64_ty, llvm_i32_ty,
                                                   llvm_ptr_ty, llvm_i32_ty,
-                                                  llvm_vararg_ty]>;
+                                                  llvm_vararg_ty],
+                                                  [Throws]>;
 def int_experimental_patchpoint_i64 : Intrinsic<[llvm_i64_ty],
                                                 [llvm_i64_ty, llvm_i32_ty,
                                                  llvm_ptr_ty, llvm_i32_ty,
-                                                 llvm_vararg_ty]>;
+                                                 llvm_vararg_ty],
+                                                 [Throws]>;
 
 //===-------------------------- Other Intrinsics --------------------------===//
 //
 def int_flt_rounds : Intrinsic<[llvm_i32_ty]>,
                      GCCBuiltin<"__builtin_flt_rounds">;
 def int_trap : Intrinsic<[], [], [IntrNoReturn]>,
                GCCBuiltin<"__builtin_trap">;
 def int_debugtrap : Intrinsic<[]>,

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

void EmitBranchForMergedCondition(const Value *Cond, MachineBasicBlock *TBB,
                                     uint32_t TW, uint32_t FW);
   bool ShouldEmitAsBranches(const std::vector<CaseBlock> &Cases);
   bool isExportableFromCurrentBlock(const Value *V, const BasicBlock *FromBB);
   void CopyToExportRegsIfNeeded(const Value *V);
   void ExportFromCurrentBlock(const Value *V);
   void LowerCallTo(ImmutableCallSite CS, SDValue Callee, bool IsTailCall,
                    MachineBasicBlock *LandingPad = nullptr);
 
-  std::pair<SDValue, SDValue> LowerCallOperands(const CallInst &CI,
-                                                unsigned ArgIdx,
-                                                unsigned NumArgs,
-                                                SDValue Callee,
-                                                bool useVoidTy = false);
+  std::pair<SDValue, SDValue> LowerCallOperands(
+          ImmutableCallSite CS,
+          bool useVoidTy = false,
+          MachineBasicBlock *LandingPad = nullptr);
 
   /// UpdateSplitBlock - When an MBB was split during scheduling, update the
   /// references that need to refer to the last resulting block.
   void UpdateSplitBlock(MachineBasicBlock *First, MachineBasicBlock *Last);
 
 private:
   std::pair<SDValue, SDValue> LowerInvokable(
           TargetLowering::CallLoweringInfo &CLI,
           MachineBasicBlock *LandingPad);
private:
   const char *visitIntrinsicCall(const CallInst &I, unsigned Intrinsic);
   void visitTargetIntrinsic(const CallInst &I, unsigned Intrinsic);
 
   void visitVAStart(const CallInst &I);
   void visitVAArg(const VAArgInst &I);
   void visitVAEnd(const CallInst &I);
   void visitVACopy(const CallInst &I);
   void visitStackmap(const CallInst &I);
-  void visitPatchpoint(const CallInst &I);
+  void visitPatchpoint(ImmutableCallSite CS, MachineBasicBlock *LandingPad);
 
   void visitUserOp1(const Instruction &I) {
     llvm_unreachable("UserOp1 should not exist at instruction selection time!");
   }
   void visitUserOp2(const Instruction &I) {
     llvm_unreachable("UserOp2 should not exist at instruction selection time!");
   }
 

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
   MachineBasicBlock *InvokeMBB = FuncInfo.MBB;
 
   // Retrieve successors.
   MachineBasicBlock *Return = FuncInfo.MBBMap[I.getSuccessor(0)];
   MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)];
 
   const Value *Callee(I.getCalledValue());
   const Function *Fn = dyn_cast<Function>(Callee);
   if (isa<InlineAsm>(Callee))
     visitInlineAsm(&I);
   else if (Fn && Fn->isIntrinsic()) {
-    assert(Fn->getIntrinsicID() == Intrinsic::donothing);
+    switch (Fn->getIntrinsicID()) {
+    default:
+      llvm_unreachable("Cannot invoke this intrinsic");
+    case Intrinsic::donothing:
       // Ignore invokes to @llvm.donothing: jump directly to the next BB.
+      break;
+    case Intrinsic::experimental_patchpoint_void:
+    case Intrinsic::experimental_patchpoint_i64:
+      visitPatchpoint(ImmutableCallSite(&I), LandingPad);
+      break;
+    }
   } else
     LowerCallTo(&I, getValue(Callee), false, LandingPad);
 
   // If the value of the invoke is used outside of its defining block, make it
   // available as a virtual register.
   CopyToExportRegsIfNeeded(&I);
 
   // Update successor info
   addSuccessorWithWeight(InvokeMBB, Return);
   addSuccessorWithWeight(InvokeMBB, LandingPad);
 
   // Drop into normal successor.
   DAG.setRoot(DAG.getNode(ISD::BR, getCurSDLoc(),
                           MVT::Other, getControlRoot(),
                           DAG.getBasicBlock(Return)));
 }
 
 void SelectionDAGBuilder::visitResume(const ResumeInst &RI) {
   llvm_unreachable("SelectionDAGBuilder shouldn't visit resume instructions!");
 }
 
 void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &LP) {
   assert(FuncInfo.MBB->isLandingPad() &&
case Intrinsic::donothing:
     // ignore
     return nullptr;
   case Intrinsic::experimental_stackmap: {
     visitStackmap(I);
     return nullptr;
   }
   case Intrinsic::experimental_patchpoint_void:
   case Intrinsic::experimental_patchpoint_i64: {
-    visitPatchpoint(I);
+    visitPatchpoint(ImmutableCallSite(&I), nullptr);
     return nullptr;
   }
   }
 }
 
 std::pair<SDValue, SDValue>
 SelectionDAGBuilder::LowerInvokable(TargetLowering::CallLoweringInfo &CLI,
                                     MachineBasicBlock *LandingPad) {

 /// \brief Lower an argument list according to the target calling convention.
 ///
 /// \return A tuple of <return-value, token-chain>
 ///
 /// This is a helper for lowering intrinsics that follow a target calling
 /// convention or require stack pointer adjustment. Only a subset of the
 /// intrinsic's operands need to participate in the calling convention.
 std::pair<SDValue, SDValue>
-SelectionDAGBuilder::LowerCallOperands(const CallInst &CI, unsigned ArgIdx,
+SelectionDAGBuilder::LowerCallOperands(ImmutableCallSite CS, unsigned ArgIdx,
                                        unsigned NumArgs, SDValue Callee,
-                                       bool useVoidTy) {
+                                       bool useVoidTy,
+                                       MachineBasicBlock *LandingPad) {
   TargetLowering::ArgListTy Args;
   Args.reserve(NumArgs);
 
   // Populate the argument list.
   // Attributes for args start at offset 1, after the return attribute.
-  ImmutableCallSite CS(&CI);
   for (unsigned ArgI = ArgIdx, ArgE = ArgIdx + NumArgs, AttrI = ArgIdx + 1;
        ArgI != ArgE; ++ArgI) {
-    const Value *V = CI.getOperand(ArgI);
+    const Value *V = CS->getOperand(ArgI);
 
     assert(!V->getType()->isEmptyTy() && "Empty type passed to intrinsic.");
 
     TargetLowering::ArgListEntry Entry;
     Entry.Node = getValue(V);
     Entry.Ty = V->getType();
     Entry.setAttributes(&CS, AttrI);
     Args.push_back(Entry);
   }
 
-  Type *retTy = useVoidTy ? Type::getVoidTy(*DAG.getContext()) : CI.getType();
+  Type *retTy = useVoidTy ? Type::getVoidTy(*DAG.getContext()) : CS->getType();
   TargetLowering::CallLoweringInfo CLI(DAG);
   CLI.setDebugLoc(getCurSDLoc()).setChain(getRoot())
-    .setCallee(CI.getCallingConv(), retTy, Callee, std::move(Args), NumArgs)
-    .setDiscardResult(!CI.use_empty());
+    .setCallee(CS.getCallingConv(), retTy, Callee, std::move(Args), NumArgs)
+    .setDiscardResult(CS->use_empty());
 
-  return LowerInvokable(CLI, nullptr);
+  return LowerInvokable(CLI, LandingPad);
 }
 
 /// \brief Add a stack map intrinsic call's live variable operands to a stackmap
 /// or patchpoint target node's operand list.
 ///
 /// Constants are converted to TargetConstants purely as an optimization to
 /// avoid constant materialization and register allocation.
 ///
 /// FrameIndex operands are converted to TargetFrameIndex so that ISEL does not
 /// generate addess computation nodes, and so ExpandISelPseudo can convert the
 /// TargetFrameIndex into a DirectMemRefOp StackMap location. This avoids
 /// address materialization and register allocation, but may also be required
 /// for correctness. If a StackMap (or PatchPoint) intrinsic directly uses an
 /// alloca in the entry block, then the runtime may assume that the alloca's
 /// StackMap location can be read immediately after compilation and that the
 /// location is valid at any point during execution (this is similar to the
 /// assumption made by the llvm.gcroot intrinsic). If the alloca's location were
 /// only available in a register, then the runtime would need to trap when
 /// execution reaches the StackMap in order to read the alloca's location.
-static void addStackMapLiveVars(const CallInst &CI, unsigned StartIdx,
+static void addStackMapLiveVars(ImmutableCallSite CS, unsigned StartIdx,
                                 SmallVectorImpl<SDValue> &Ops,
                                 SelectionDAGBuilder &Builder) {
-  for (unsigned i = StartIdx, e = CI.getNumArgOperands(); i != e; ++i) {
-    SDValue OpVal = Builder.getValue(CI.getArgOperand(i));
+  for (unsigned i = StartIdx, e = CS.arg_size(); i != e; ++i) {
+    SDValue OpVal = Builder.getValue(CS.getArgument(i));
     if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(OpVal)) {
       Ops.push_back(
         Builder.DAG.getTargetConstant(StackMaps::ConstantOp, MVT::i64));
       Ops.push_back(
         Builder.DAG.getTargetConstant(C->getSExtValue(), MVT::i64));
     } else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(OpVal)) {
       const TargetLowering &TLI = Builder.DAG.getTargetLoweringInfo();
       Ops.push_back(
void SelectionDAGBuilder::visitStackmap(const CallInst &CI) {
   SDValue IDVal = getValue(CI.getOperand(PatchPointOpers::IDPos));
   Ops.push_back(DAG.getTargetConstant(
                   cast<ConstantSDNode>(IDVal)->getZExtValue(), MVT::i64));
   SDValue NBytesVal = getValue(CI.getOperand(PatchPointOpers::NBytesPos));
   Ops.push_back(DAG.getTargetConstant(
                   cast<ConstantSDNode>(NBytesVal)->getZExtValue(), MVT::i32));
 
   // Push live variables for the stack map.
-  addStackMapLiveVars(CI, 2, Ops, *this);
+  addStackMapLiveVars(ImmutableCallSite(&CI), 2, Ops, *this);
 
   // We are not pushing any register mask info here on the operands list,
   // because the stackmap doesn't clobber anything.
 
   // Push the chain and the glue flag.
   Ops.push_back(Chain);
   Ops.push_back(InFlag);
 
void SelectionDAGBuilder::visitStackmap(const CallInst &CI) {
   // Set the root to the target-lowered call chain.
   DAG.setRoot(Chain);
 
   // Inform the Frame Information that we have a stackmap in this function.
   FuncInfo.MF->getFrameInfo()->setHasStackMap();
 }
 
 /// \brief Lower llvm.experimental.patchpoint directly to its target opcode.
-void SelectionDAGBuilder::visitPatchpoint(const CallInst &CI) {
+void SelectionDAGBuilder::visitPatchpoint(ImmutableCallSite CS,
+                                          MachineBasicBlock *LandingPad) {
   // void|i64 @llvm.experimental.patchpoint.void|i64(i64 <id>,
   //                                                 i32 <numBytes>,
   //                                                 i8* <target>,
   //                                                 i32 <numArgs>,
   //                                                 [Args...],
   //                                                 [live variables...])
 
-  CallingConv::ID CC = CI.getCallingConv();
+  CallingConv::ID CC = CS.getCallingConv();
   bool isAnyRegCC = CC == CallingConv::AnyReg;
-  bool hasDef = !CI.getType()->isVoidTy();
-  SDValue Callee = getValue(CI.getOperand(2)); // <target>
+  bool hasDef = !CS->getType()->isVoidTy();
+  SDValue Callee = getValue(CS->getOperand(2)); // <target>
 
   // Get the real number of arguments participating in the call <numArgs>
-  SDValue NArgVal = getValue(CI.getArgOperand(PatchPointOpers::NArgPos));
+  SDValue NArgVal = getValue(CS.getArgument(PatchPointOpers::NArgPos));
   unsigned NumArgs = cast<ConstantSDNode>(NArgVal)->getZExtValue();
 
   // Skip the four meta args: <id>, <numNopBytes>, <target>, <numArgs>
   // Intrinsics include all meta-operands up to but not including CC.
   unsigned NumMetaOpers = PatchPointOpers::CCPos;
-  assert(CI.getNumArgOperands() >= NumMetaOpers + NumArgs &&
+  assert(CS.arg_size() >= NumMetaOpers + NumArgs &&
          "Not enough arguments provided to the patchpoint intrinsic");
 
   // For AnyRegCC the arguments are lowered later on manually.
   unsigned NumCallArgs = isAnyRegCC ? 0 : NumArgs;
   std::pair<SDValue, SDValue> Result =
-    LowerCallOperands(CI, NumMetaOpers, NumCallArgs, Callee, isAnyRegCC);
+    LowerCallOperands(CS, NumMetaOpers, NumCallArgs, Callee, isAnyRegCC,
+                      LandingPad);
 
   // Set the root to the target-lowered call chain.
   SDValue Chain = Result.second;
 
   SDNode *CallEnd = Chain.getNode();
   if (hasDef && (CallEnd->getOpcode() == ISD::CopyFromReg))
     CallEnd = CallEnd->getOperand(0).getNode();
 
   /// Get a call instruction from the call sequence chain.
   /// Tail calls are not allowed.
   assert(CallEnd->getOpcode() == ISD::CALLSEQ_END &&
          "Expected a callseq node.");
   SDNode *Call = CallEnd->getOperand(0).getNode();
   bool hasGlue = Call->getGluedNode();
 
   // Replace the target specific call node with the patchable intrinsic.
   SmallVector<SDValue, 8> Ops;
 
   // Add the <id> and <numBytes> constants.
-  SDValue IDVal = getValue(CI.getOperand(PatchPointOpers::IDPos));
+  SDValue IDVal = getValue(CS->getOperand(PatchPointOpers::IDPos));
   Ops.push_back(DAG.getTargetConstant(
                   cast<ConstantSDNode>(IDVal)->getZExtValue(), MVT::i64));
-  SDValue NBytesVal = getValue(CI.getOperand(PatchPointOpers::NBytesPos));
+  SDValue NBytesVal = getValue(CS->getOperand(PatchPointOpers::NBytesPos));
   Ops.push_back(DAG.getTargetConstant(
                   cast<ConstantSDNode>(NBytesVal)->getZExtValue(), MVT::i32));
 
   // Assume that the Callee is a constant address.
   // FIXME: handle function symbols in the future.
   Ops.push_back(
     DAG.getIntPtrConstant(cast<ConstantSDNode>(Callee)->getZExtValue(),
                           /*isTarget=*/true));
 
   // Adjust <numArgs> to account for any arguments that have been passed on the
   // stack instead.
   // Call Node: Chain, Target, {Args}, RegMask, [Glue]
   unsigned NumCallRegArgs = Call->getNumOperands() - (hasGlue ? 4 : 3);
   NumCallRegArgs = isAnyRegCC ? NumArgs : NumCallRegArgs;
   Ops.push_back(DAG.getTargetConstant(NumCallRegArgs, MVT::i32));
 
   // Add the calling convention
   Ops.push_back(DAG.getTargetConstant((unsigned)CC, MVT::i32));
 
   // Add the arguments we omitted previously. The register allocator should
   // place these in any free register.
   if (isAnyRegCC)
     for (unsigned i = NumMetaOpers, e = NumMetaOpers + NumArgs; i != e; ++i)
-      Ops.push_back(getValue(CI.getArgOperand(i)));
+      Ops.push_back(getValue(CS.getArgument(i)));
 
   // Push the arguments from the call instruction up to the register mask.
   SDNode::op_iterator e = hasGlue ? Call->op_end()-2 : Call->op_end()-1;
   for (SDNode::op_iterator i = Call->op_begin()+2; i != e; ++i)
     Ops.push_back(*i);
 
   // Push live variables for the stack map.
-  addStackMapLiveVars(CI, NumMetaOpers + NumArgs, Ops, *this);
+  addStackMapLiveVars(CS, NumMetaOpers + NumArgs, Ops, *this);
 
   // Push the register mask info.
   if (hasGlue)
     Ops.push_back(*(Call->op_end()-2));
   else
     Ops.push_back(*(Call->op_end()-1));
 
   // Push the chain (this is originally the first operand of the call, but
   // becomes now the last or second to last operand).
   Ops.push_back(*(Call->op_begin()));
 
   // Push the glue flag (last operand).
   if (hasGlue)
     Ops.push_back(*(Call->op_end()-1));
 
   SDVTList NodeTys;
   if (isAnyRegCC && hasDef) {
     // Create the return types based on the intrinsic definition
     const TargetLowering &TLI = DAG.getTargetLoweringInfo();
     SmallVector<EVT, 3> ValueVTs;
-    ComputeValueVTs(TLI, CI.getType(), ValueVTs);
+    ComputeValueVTs(TLI, CS->getType(), ValueVTs);
     assert(ValueVTs.size() == 1 && "Expected only one return value type.");
 
     // There is always a chain and a glue type at the end
     ValueVTs.push_back(MVT::Other);
     ValueVTs.push_back(MVT::Glue);
     NodeTys = DAG.getVTList(ValueVTs);
   } else
     NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
 
   // Replace the target specific call node with a PATCHPOINT node.
   MachineSDNode *MN = DAG.getMachineNode(TargetOpcode::PATCHPOINT,
                                          getCurSDLoc(), NodeTys, Ops);
 
   // Update the NodeMap.
   if (hasDef) {
     if (isAnyRegCC)
-      setValue(&CI, SDValue(MN, 0));
+      setValue(CS.getInstruction(), SDValue(MN, 0));
     else
-      setValue(&CI, Result.first);
+      setValue(CS.getInstruction(), Result.first);
   }
 
   // Fixup the consumers of the intrinsic. The chain and glue may be used in the
   // call sequence. Furthermore the location of the chain and glue can change
   // when the AnyReg calling convention is used and the intrinsic returns a
   // value.
   if (isAnyRegCC && hasDef) {
     SDValue From[] = {SDValue(Call, 0), SDValue(Call, 1)};

lib/IR/Verifier.cpp

for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
     // instructions.
     if (!I.getOperand(i)->getType()->isFirstClassType()) {
       Assert1(0, "Instruction operands must be first-class values!", &I);
     }
 
     if (Function *F = dyn_cast<Function>(I.getOperand(i))) {
       // Check to make sure that the "address of" an intrinsic function is never
       // taken.
-      Assert1(!F->isIntrinsic() || i == (isa<CallInst>(I) ? e-1 : 0),
+      Assert1(!F->isIntrinsic() || i == (isa<CallInst>(I) ? e-1 :
+                                         isa<InvokeInst>(I) ? e-3 : 0),
               "Cannot take the address of an intrinsic!", &I);
       Assert1(!F->isIntrinsic() || isa<CallInst>(I) ||
-              F->getIntrinsicID() == Intrinsic::donothing,
-              "Cannot invoke an intrinsinc other than donothing", &I);
+              F->getIntrinsicID() == Intrinsic::donothing ||
+              F->getIntrinsicID() == Intrinsic::experimental_patchpoint_void ||
+              F->getIntrinsicID() == Intrinsic::experimental_patchpoint_i64,
+              "Cannot invoke an intrinsinc other than"
+              " donothing or patchpoint", &I);
       Assert1(F->getParent() == M, "Referencing function in another module!",
               &I);
     } else if (BasicBlock *OpBB = dyn_cast<BasicBlock>(I.getOperand(i))) {
       Assert1(OpBB->getParent() == BB->getParent(),
               "Referring to a basic block in another function!", &I);
     } else if (Argument *OpArg = dyn_cast<Argument>(I.getOperand(i))) {
       Assert1(OpArg->getParent() == BB->getParent(),
               "Referring to an argument in another function!", &I);

test/CodeGen/X86/patchpoint-invoke.ll

+; RUN: llc -mtriple=x86_64-linux-generic -mcpu=corei7                             < %s | FileCheck %s
+
+; Test invoking of patchpoints
+;
+define i64 @patchpoint_invoke(i64 %p1, i64 %p2) {
+entry:
+; CHECK-LABEL: patchpoint_invoke:
+; CHECK-NEXT: .cfi_startproc
+; CHECK:      .Leh_func_begin0:
+; CHECK:      .cfi_lsda 3, .Lexception0
+; CHECK:      pushq %rbp
+
+; CHECK:      .Ltmp0:
+; CHECK-NEXT: .Ltmp6:
+; CHECK-NEXT: movabsq $-559038736, %r11
+; CHECK-NEXT: callq *%r11
+; CHECK-NEXT: xchgw %ax, %ax
+; CHECK-NEXT: .Ltmp1:
+; CHECK:      ret
+  %resolveCall = inttoptr i64 -559038736 to i8*
+  %result = invoke i64 (i64, i32, i8*, i32, ...)* @llvm.experimental.patchpoint.i64(i64 2, i32 15, i8* %resolveCall, i32 1, i64 %p1, i64 %p2)
+            to label %success unwind label %threw
+
+success:
+  ret i64 %result
+
+threw:
+  %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+          catch i8* null
+  ret i64 0
+}
+
+; Verify that the exception table was emitted:
+; CHECK-LABEL: .Lexception0:
+; Header?
+; CHECK-NEXT: .byte 255
+; CHECK-NEXT: .byte 3
+; CHECK-NEXT: .byte 21
+; CHECK-NEXT: .byte 3
+; CHECK-NEXT: .byte 13
+; CHECK-NEXT: .Lset0 = .Ltmp0-.Leh_func_begin0
+; CHECK-NEXT: .long .Lset0
+; CHECK-NEXT: .Lset1 = .Ltmp1-.Ltmp0
+; CHECK-NEXT: .long .Lset1
+
+
+; Verify that the stackmap section got emitted:
+; CHECK-LABEL: __LLVM_StackMaps:
+; Header
+; CHECK-NEXT:   .byte 1
+; CHECK-NEXT:   .byte 0
+; CHECK-NEXT:   .short 0
+; Num Functions
+; CHECK-NEXT:   .long 1
+; Num LargeConstants
+; CHECK-NEXT:   .long 0
+; Num Callsites
+; CHECK-NEXT:   .long 1
+; CHECK-NEXT:   .quad patchpoint_invoke
+
+
+declare void @llvm.experimental.stackmap(i64, i32, ...)
+declare void @llvm.experimental.patchpoint.void(i64, i32, i8*, i32, ...)
+declare i64 @llvm.experimental.patchpoint.i64(i64, i32, i8*, i32, ...)
+declare i32 @__gxx_personality_v0(...)

test/Verifier/invoke.ll

 contb:
   %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
           filter [0 x i8*] zeroinitializer
   ret void
 }
 
 define i8 @f2() {
 entry:
-; CHECK: Cannot invoke an intrinsinc other than donothing
+; CHECK: Cannot invoke an intrinsinc other than donothing or patchpoint
   invoke void @llvm.trap()
   to label %cont unwind label %lpad
 
 cont:
   ret i8 3
 
 lpad:
   %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)