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[ObjCARC] Even more debug messages!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172347 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman 2013-01-13 07:47:32 +00:00
parent cf14005185
commit 981308cffb
1 changed files with 17 additions and 1 deletions
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18
lib/Transforms/Scalar/ObjCARC.cpp
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@ -619,14 +619,23 @@ static bool ModuleHasARC(const Module &M) {
/// escape analysis in that a use as an argument to a call is not considered
/// an escape.
static bool DoesObjCBlockEscape(const Value *BlockPtr) {
DEBUG(dbgs() << "DoesObjCBlockEscape: Target: " << *BlockPtr << "\n");
// Walk the def-use chains.
SmallVector<const Value *, 4> Worklist;
Worklist.push_back(BlockPtr);
do {
const Value *V = Worklist.pop_back_val();
DEBUG(dbgs() << "DoesObjCBlockEscape: Visiting: " << *V << "\n");
for (Value::const_use_iterator UI = V->use_begin(), UE = V->use_end();
UI != UE; ++UI) {
const User *UUser = *UI;
DEBUG(dbgs() << "DoesObjCBlockEscape: User: " << *UUser << "\n");
// Special - Use by a call (callee or argument) is not considered
// to be an escape.
switch (GetBasicInstructionClass(UUser)) {
@ -634,15 +643,20 @@ static bool DoesObjCBlockEscape(const Value *BlockPtr) {
case IC_InitWeak:
case IC_StoreStrong:
case IC_Autorelease:
case IC_AutoreleaseRV:
case IC_AutoreleaseRV: {
DEBUG(dbgs() << "DoesObjCBlockEscape: User copies pointer arguments. "
"Block Escapes!\n");
// These special functions make copies of their pointer arguments.
return true;
}
case IC_User:
case IC_None:
// Use by an instruction which copies the value is an escape if the
// result is an escape.
if (isa<BitCastInst>(UUser) || isa<GetElementPtrInst>(UUser) ||
isa<PHINode>(UUser) || isa<SelectInst>(UUser)) {
DEBUG(dbgs() << "DoesObjCBlockEscape: User copies value. Escapes if "
"result escapes. Adding to list.\n");
Worklist.push_back(UUser);
continue;
}
@ -659,11 +673,13 @@ static bool DoesObjCBlockEscape(const Value *BlockPtr) {
continue;
}
// Otherwise, conservatively assume an escape.
DEBUG(dbgs() << "DoesObjCBlockEscape: Assuming block escapes.\n");
return true;
}
} while (!Worklist.empty());
// No escapes found.
DEBUG(dbgs() << "DoesObjCBlockEscape: Block does not escape.\n");
return false;
}