From 252ef566e8734b6bcf46434d0a7954c9eda0bd96 Mon Sep 17 00:00:00 2001
From: Nuno Lopes <nunoplopes@sapo.pt>
Date: Thu, 3 May 2012 21:19:58 +0000
Subject: add support for calloc to objectsize lowering

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156102 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/MemoryBuiltins.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'lib/Analysis/MemoryBuiltins.cpp')

diff --git a/lib/Analysis/MemoryBuiltins.cpp b/lib/Analysis/MemoryBuiltins.cpp
index b145650b0f..347a7ea7a8 100644
--- a/lib/Analysis/MemoryBuiltins.cpp
+++ b/lib/Analysis/MemoryBuiltins.cpp
@@ -180,6 +180,46 @@ Value *llvm::getMallocArraySize(CallInst *CI, const TargetData *TD,
   return computeArraySize(CI, TD, LookThroughSExt);
 }
 
+
+//===----------------------------------------------------------------------===//
+//  clloc Call Utility Functions.
+//
+
+static bool isCallocCall(const CallInst *CI) {
+  if (!CI)
+    return false;
+  
+  Function *Callee = CI->getCalledFunction();
+  if (Callee == 0 || !Callee->isDeclaration())
+    return false;
+  if (Callee->getName() != "calloc")
+    return false;
+  
+  // Check malloc prototype.
+  // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin 
+  // attribute will exist.
+  FunctionType *FTy = Callee->getFunctionType();
+  return FTy->getReturnType() == Type::getInt8PtrTy(FTy->getContext()) &&
+  FTy->getNumParams() == 2 &&
+  ((FTy->getParamType(0)->isIntegerTy(32) &&
+    FTy->getParamType(1)->isIntegerTy(32)) ||
+   (FTy->getParamType(0)->isIntegerTy(64) &&
+    FTy->getParamType(1)->isIntegerTy(64)));
+}
+
+/// extractCallocCall - Returns the corresponding CallInst if the instruction
+/// is a calloc call.
+const CallInst *llvm::extractCallocCall(const Value *I) {
+  const CallInst *CI = dyn_cast<CallInst>(I);
+  return isCallocCall(CI) ? CI : 0;
+}
+
+CallInst *llvm::extractCallocCall(Value *I) {
+  CallInst *CI = dyn_cast<CallInst>(I);
+  return isCallocCall(CI) ? CI : 0;
+}
+
+
 //===----------------------------------------------------------------------===//
 //  free Call Utility Functions.
 //
-- 
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