6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-12 03:32:10 +00:00
Code Issues Projects Releases Wiki Activity

Fix crashes and infinite loops.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57408 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-10-12 06:03:38 +00:00
parent 4382f62a05
commit 5efff7735d
1 changed files with 14 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
lib/Analysis/EscapeAnalysis.cpp
View File

@ -48,6 +48,7 @@ bool EscapeAnalysis::runOnFunction(Function& F) {
bool inserted = false; bool inserted = false;
for (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end(); for (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end();
AI != AE; ++AI) { AI != AE; ++AI) {
if (!isa<PointerType>(AI->getType())) continue;
AliasAnalysis::AliasResult R = AA.alias(Pointer, StoreSize, AI, ~0UL); AliasAnalysis::AliasResult R = AA.alias(Pointer, StoreSize, AI, ~0UL);
if (R != AliasAnalysis::NoAlias) { if (R != AliasAnalysis::NoAlias) {
EscapePoints.insert(S); EscapePoints.insert(S);
@ -102,26 +103,27 @@ bool EscapeAnalysis::escapes(AllocationInst* A) {
worklist.push_back(A); worklist.push_back(A);
SmallPtrSet<Instruction*, 8> visited; SmallPtrSet<Instruction*, 8> visited;
visited.insert(A);
while (!worklist.empty()) { while (!worklist.empty()) {
Instruction* curr = worklist.back(); Instruction* curr = worklist.back();
worklist.pop_back(); worklist.pop_back();
visited.insert(curr);
if (EscapePoints.count(curr)) if (EscapePoints.count(curr))
return true; return true;
for (Instruction::use_iterator UI = curr->use_begin(), UE = curr->use_end(); if (StoreInst* S = dyn_cast<StoreInst>(curr)) {
UI != UE; ++UI) // We know this must be an instruction, because constant gep's would
if (Instruction* U = dyn_cast<Instruction>(UI)) // have been found to alias a global, so stores to them would have
if (!visited.count(U)) // been in EscapePoints.
if (StoreInst* S = dyn_cast<StoreInst>(U)) { if (visited.insert(cast<Instruction>(S->getPointerOperand())))
// We know this must be an instruction, because constant gep's would worklist.push_back(cast<Instruction>(S->getPointerOperand()));
// have been found to alias a global, so stores to them would have } else {
// been in EscapePoints. for (Instruction::use_iterator UI = curr->use_begin(),
worklist.push_back(cast<Instruction>(S->getPointerOperand())); UE = curr->use_end(); UI != UE; ++UI)
} else if (Instruction* U = dyn_cast<Instruction>(UI))
if (visited.insert(U))
worklist.push_back(U); worklist.push_back(U);
}
} }
return false; return false;