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Add special-case code to allow null-guards on calls to malloc.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57413 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-10-12 08:10:46 +00:00
parent 4b089929b4
commit b5cf048fdf
1 changed files with 16 additions and 2 deletions
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18
lib/Analysis/EscapeAnalysis.cpp
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@ -13,6 +13,7 @@
#define DEBUG_TYPE "escape-analysis"
#include "llvm/Analysis/EscapeAnalysis.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/ADT/SmallPtrSet.h"
@ -112,8 +113,21 @@ bool EscapeAnalysis::escapes(Value* A) {
worklist.pop_back();
if (Instruction* I = dyn_cast<Instruction>(curr))
if (EscapePoints.count(I))
return true;
if (EscapePoints.count(I)) {
BranchInst* B = dyn_cast<BranchInst>(I);
if (!B) return true;
Value* condition = B->getCondition();
ICmpInst* C = dyn_cast<ICmpInst>(condition);
if (!C) return true;
Value* O1 = C->getOperand(0);
Value* O2 = C->getOperand(1);
if (isa<MallocInst>(O1->stripPointerCasts())) {
if (!isa<ConstantPointerNull>(O2)) return true;
} else if(isa<MallocInst>(O2->stripPointerCasts())) {
if (!isa<ConstantPointerNull>(O1)) return true;
} else
return true;
}
if (StoreInst* S = dyn_cast<StoreInst>(curr)) {
// We know this must be an instruction, because constant gep's would