Add support for invoke to the MemoryBuiltin analysid.

Update comments accordingly.

Make instcombine remove useless invokes to C++'s 'new' allocation function (test attached).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158937 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/MemoryBuiltins.h

@@ -31,28 +31,29 @@ class Type;
 class Value;
 
 
-/// \brief Tests if a value is a call to a library function that allocates or
+/// \brief Tests if a value is a call or invoke to a library function that
-/// reallocates memory (either malloc, calloc, realloc, or strdup like).
+/// allocates or reallocates memory (either malloc, calloc, realloc, or strdup
+/// like).
 bool isAllocationFn(const Value *V, bool LookThroughBitCast = false);
 
-/// \brief Tests if a value is a call to a function that returns a NoAlias
+/// \brief Tests if a value is a call or invoke to a function that returns a
-/// pointer (including malloc/calloc/strdup-like functions).
+/// NoAlias pointer (including malloc/calloc/strdup-like functions).
 bool isNoAliasFn(const Value *V, bool LookThroughBitCast = false);
 
-/// \brief Tests if a value is a call to a library function that allocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// uninitialized memory (such as malloc).
+/// allocates uninitialized memory (such as malloc).
 bool isMallocLikeFn(const Value *V, bool LookThroughBitCast = false);
 
-/// \brief Tests if a value is a call to a library function that allocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// zero-filled memory (such as calloc).
+/// allocates zero-filled memory (such as calloc).
 bool isCallocLikeFn(const Value *V, bool LookThroughBitCast = false);
 
-/// \brief Tests if a value is a call to a library function that allocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// memory (either malloc, calloc, or strdup like).
+/// allocates memory (either malloc, calloc, or strdup like).
 bool isAllocLikeFn(const Value *V, bool LookThroughBitCast = false);
 
-/// \brief Tests if a value is a call to a library function that reallocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// memory (such as realloc).
+/// reallocates memory (such as realloc).
 bool isReallocLikeFn(const Value *V, bool LookThroughBitCast = false);
 
 

lib/Analysis/MemoryBuiltins.cpp

@@ -65,11 +65,17 @@ static const AllocFnsTy AllocationFnData[] = {
 static Function *getCalledFunction(const Value *V, bool LookThroughBitCast) {
   if (LookThroughBitCast)
     V = V->stripPointerCasts();
-  const CallInst *CI = dyn_cast<CallInst>(V);
+
-  if (!CI)
+  Value *I = const_cast<Value*>(V);
+  CallSite CS;
+  if (CallInst *CI = dyn_cast<CallInst>(I))
+    CS = CallSite(CI);
+  else if (InvokeInst *II = dyn_cast<InvokeInst>(I))
+    CS = CallSite(II);
+  else
     return 0;
 
-  Function *Callee = CI->getCalledFunction();
+  Function *Callee = CS.getCalledFunction();
   if (!Callee || !Callee->isDeclaration())
     return 0;
   return Callee;
@@ -122,39 +128,40 @@ static bool hasNoAliasAttr(const Value *V, bool LookThroughBitCast) {
 }
 
 
-/// \brief Tests if a value is a call to a library function that allocates or
+/// \brief Tests if a value is a call or invoke to a library function that
-/// reallocates memory (either malloc, calloc, realloc, or strdup like).
+/// allocates or reallocates memory (either malloc, calloc, realloc, or strdup
+/// like).
 bool llvm::isAllocationFn(const Value *V, bool LookThroughBitCast) {
   return getAllocationData(V, AnyAlloc, LookThroughBitCast);
 }
 
-/// \brief Tests if a value is a call to a function that returns a NoAlias
+/// \brief Tests if a value is a call or invoke to a function that returns a
-/// pointer (including malloc/calloc/strdup-like functions).
+/// NoAlias pointer (including malloc/calloc/strdup-like functions).
 bool llvm::isNoAliasFn(const Value *V, bool LookThroughBitCast) {
   return isAllocLikeFn(V, LookThroughBitCast) ||
          hasNoAliasAttr(V, LookThroughBitCast);
 }
 
-/// \brief Tests if a value is a call to a library function that allocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// uninitialized memory (such as malloc).
+/// allocates uninitialized memory (such as malloc).
 bool llvm::isMallocLikeFn(const Value *V, bool LookThroughBitCast) {
   return getAllocationData(V, MallocLike, LookThroughBitCast);
 }
 
-/// \brief Tests if a value is a call to a library function that allocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// zero-filled memory (such as calloc).
+/// allocates zero-filled memory (such as calloc).
 bool llvm::isCallocLikeFn(const Value *V, bool LookThroughBitCast) {
   return getAllocationData(V, CallocLike, LookThroughBitCast);
 }
 
-/// \brief Tests if a value is a call to a library function that allocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// memory (either malloc, calloc, or strdup like).
+/// allocates memory (either malloc, calloc, or strdup like).
 bool llvm::isAllocLikeFn(const Value *V, bool LookThroughBitCast) {
   return getAllocationData(V, AllocLike, LookThroughBitCast);
 }
 
-/// \brief Tests if a value is a call to a library function that reallocates
+/// \brief Tests if a value is a call or invoke to a library function that
-/// memory (such as realloc).
+/// reallocates memory (such as realloc).
 bool llvm::isReallocLikeFn(const Value *V, bool LookThroughBitCast) {
   return getAllocationData(V, ReallocLike, LookThroughBitCast);
 }

lib/Transforms/InstCombine/InstCombineCalls.cpp

@@ -172,8 +172,6 @@ Instruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) {
 Instruction *InstCombiner::visitCallInst(CallInst &CI) {
   if (isFreeCall(&CI))
     return visitFree(CI);
-  if (isAllocLikeFn(&CI))
-    return visitMalloc(CI);
 
   // If the caller function is nounwind, mark the call as nounwind, even if the
   // callee isn't.
@@ -881,6 +879,9 @@ static IntrinsicInst *FindInitTrampoline(Value *Callee) {
 // visitCallSite - Improvements for call and invoke instructions.
 //
 Instruction *InstCombiner::visitCallSite(CallSite CS) {
+  if (isAllocLikeFn(CS.getInstruction()))
+    return visitMalloc(*CS.getInstruction());
+
   bool Changed = false;
 
   // If the callee is a pointer to a function, attempt to move any casts to the

lib/Transforms/InstCombine/InstructionCombining.cpp

@@ -1167,6 +1167,10 @@ Instruction *InstCombiner::visitMalloc(Instruction &MI) {
       }
       EraseInstFromFunction(*I);
     }
+
+    if (InvokeInst *II = dyn_cast<InvokeInst>(&MI)) {
+      BranchInst::Create(II->getNormalDest(), II->getParent());
+    }
     return EraseInstFromFunction(MI);
   }
   return 0;

test/Transforms/InstCombine/objsize-64.ll

@@ -2,6 +2,9 @@
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
 
 declare noalias i8* @malloc(i32) nounwind
+declare noalias i8* @_Znwm(i64)  ; new(unsigned long)
+declare i32 @__gxx_personality_v0(...)
+declare void @__cxa_call_unexpected(i8*)
 declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readonly
 
 ; CHECK: @f1
@@ -11,3 +14,24 @@ define i64 @f1() {
 ; CHECK-NEXT: ret i64 4
   ret i64 %size
 }
+
+
+; CHECK: @f2
+define i64 @f2() nounwind uwtable ssp {
+entry:
+; CHECK: br label
+  %call = invoke noalias i8* @_Znwm(i64 13)
+          to label %invoke.cont unwind label %lpad
+
+invoke.cont:
+; CHECK: ret i64 13
+  %0 = tail call i64 @llvm.objectsize.i64(i8* %call, i1 false)
+  ret i64 %0
+
+lpad:
+  %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+          filter [0 x i8*] zeroinitializer
+  %2 = extractvalue { i8*, i32 } %1, 0
+  tail call void @__cxa_call_unexpected(i8* %2) noreturn nounwind
+  unreachable
+}