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Don't treat malloc calls with non-matching prototype as malloc.

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Fixes second part of PR5130, miscompilation in FreeBSD kernel, where malloc takes 3 params,
and *does* initialize memory.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83324 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin 2009-10-05 21:15:43 +00:00
parent aa5c1b7f93
commit 85c005af0d
1 changed files with 13 additions and 2 deletions
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15
lib/Analysis/MallocHelper.cpp
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@ -34,12 +34,23 @@ static bool isMallocCall(const CallInst *CI) {
return false; return false;
const Module* M = CI->getParent()->getParent()->getParent(); const Module* M = CI->getParent()->getParent()->getParent();
Constant *MallocFunc = M->getFunction("malloc"); Function *MallocFunc = M->getFunction("malloc");
if (CI->getOperand(0) != MallocFunc) if (CI->getOperand(0) != MallocFunc)
return false; return false;
return true; // Check malloc prototype.
// FIXME: this will be obsolete when nobuiltin attribute will exist.
const FunctionType *FTy = MallocFunc->getFunctionType();
if (FTy->getNumParams() != 1)
return false;
if (IntegerType *ITy = dyn_cast<IntegerType>(FTy->param_begin()->get())) {
if (ITy->getBitWidth() != 32 && ITy->getBitWidth() != 64)
return false;
return true;
}
return false;
} }
/// extractMallocCall - Returns the corresponding CallInst if the instruction /// extractMallocCall - Returns the corresponding CallInst if the instruction