Verify function prototypes before trying to optimize functions. We also

need TargetData, just return false if we don't have it.

Update testcases accordingly.

Fixes PR6807.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101011 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/BuildLibCalls.cpp

@@ -373,15 +373,29 @@ void llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File,
 SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { }
 
 bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
+  // We really need TargetData for later.
+  if (!TD) return false;
+  
   this->CI = CI;
-  StringRef Name = CI->getCalledFunction()->getName();
+  Function *Callee = CI->getCalledFunction();
+  StringRef Name = Callee->getName();
+  const FunctionType *FT = Callee->getFunctionType();
   BasicBlock *BB = CI->getParent();
-  IRBuilder<> B(CI->getParent()->getContext());
+  LLVMContext &Context = CI->getParent()->getContext();
+  IRBuilder<> B(Context);
 
   // Set the builder to the instruction after the call.
   B.SetInsertPoint(BB, CI);
 
   if (Name == "__memcpy_chk") {
+    // Check if this has the right signature.
+    if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
+        !FT->getParamType(0)->isPointerTy() ||
+        !FT->getParamType(1)->isPointerTy() ||
+        FT->getParamType(2) != TD->getIntPtrType(Context) ||
+        FT->getParamType(3) != TD->getIntPtrType(Context))
+      return false;
+    
     if (isFoldable(4, 3, false)) {
       EmitMemCpy(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3),
                  1, false, B, TD);
@@ -397,6 +411,14 @@ bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
   }
 
   if (Name == "__memmove_chk") {
+    // Check if this has the right signature.
+    if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
+        !FT->getParamType(0)->isPointerTy() ||
+        !FT->getParamType(1)->isPointerTy() ||
+        FT->getParamType(2) != TD->getIntPtrType(Context) ||
+        FT->getParamType(3) != TD->getIntPtrType(Context))
+      return false;
+    
     if (isFoldable(4, 3, false)) {
       EmitMemMove(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3),
                   1, false, B, TD);
@@ -407,6 +429,14 @@ bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
   }
 
   if (Name == "__memset_chk") {
+    // Check if this has the right signature.
+    if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
+        !FT->getParamType(0)->isPointerTy() ||
+        !FT->getParamType(1)->isIntegerTy() ||
+        FT->getParamType(2) != TD->getIntPtrType(Context) ||
+        FT->getParamType(3) != TD->getIntPtrType(Context))
+      return false;
+    
     if (isFoldable(4, 3, false)) {
       Value *Val = B.CreateIntCast(CI->getOperand(2), B.getInt8Ty(),
                                    false);
@@ -418,6 +448,15 @@ bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
   }
 
   if (Name == "__strcpy_chk" || Name == "__stpcpy_chk") {
+    // Check if this has the right signature.
+    if (FT->getNumParams() != 3 ||
+        FT->getReturnType() != FT->getParamType(0) ||
+        FT->getParamType(0) != FT->getParamType(1) ||
+        FT->getParamType(0) != Type::getInt8PtrTy(Context) ||
+        FT->getParamType(2) != TD->getIntPtrType(Context))
+      return 0;
+    
+    
     // If a) we don't have any length information, or b) we know this will
     // fit then just lower to a plain st[rp]cpy. Otherwise we'll keep our
     // st[rp]cpy_chk call which may fail at runtime if the size is too long.
@@ -433,6 +472,13 @@ bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
   }
 
   if (Name == "__strncpy_chk" || Name == "__stpncpy_chk") {
+    // Check if this has the right signature.
+    if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
+        FT->getParamType(0) != FT->getParamType(1) ||
+        FT->getParamType(0) != Type::getInt8PtrTy(Context) ||
+        !FT->getParamType(2)->isIntegerTy() ||
+        FT->getParamType(3) != TD->getIntPtrType(Context))
+    
     if (isFoldable(4, 3, false)) {
       Value *Ret = EmitStrNCpy(CI->getOperand(1), CI->getOperand(2),
                                CI->getOperand(3), B, TD, Name.substr(2, 7));

test/Transforms/InstCombine/objsize.ll

@@ -111,10 +111,10 @@ define i32 @test4() nounwind ssp {
 entry:
   %0 = alloca %struct.data, align 8
   %1 = bitcast %struct.data* %0 to i8*
-  %2 = call i64 @llvm.objectsize.i64(i8* %1, i1 false) nounwind
+  %2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false) nounwind
 ; CHECK-NOT: @llvm.objectsize
-; CHECK: @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 1824, i32 8, i1 false)
+; CHECK: @llvm.memset.p0i8.i32(i8* %1, i8 0, i32 1824, i32 8, i1 false)
-  %3 = call i8* @__memset_chk(i8* %1, i32 0, i64 1824, i64 %2) nounwind
+  %3 = call i8* @__memset_chk(i8* %1, i32 0, i32 1824, i32 %2) nounwind
   ret i32 0
 }
 
@@ -150,5 +150,3 @@ declare i8* @__memset_chk(i8*, i32, i64, i64) nounwind
 declare noalias i8* @malloc(i32) nounwind
 
 declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
-
-declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readonly

test/Transforms/InstCombine/strcpy_chk.ll

@@ -1,4 +1,5 @@
 ; RUN: opt < %s -instcombine -S | FileCheck %s
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
 @a = common global [60 x i8] zeroinitializer, align 1 ; <[60 x i8]*> [#uses=1]
 @.str = private constant [8 x i8] c"abcdefg\00"   ; <[8 x i8]*> [#uses=1]