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Extend 'readonly' and 'readnone' to work on function arguments as well as

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functions. Make the function attributes pass add it to known library functions
and when it can deduce it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2013-07-06 00:29:58 +00:00
parent 202eb7b18e
commit dc89737bcd
22 changed files with 547 additions and 86 deletions
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lib/Analysis/CaptureTracking.cpp
+4 -4
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@@ -158,10 +158,10 @@ void llvm::PointerMayBeCaptured(const Value *V, CaptureTracker *Tracker) {
// Don't count comparisons of a no-alias return value against null as
// captures. This allows us to ignore comparisons of malloc results
// with null, for example.
if (isNoAliasCall(V->stripPointerCasts()))
if (ConstantPointerNull *CPN =
dyn_cast<ConstantPointerNull>(I->getOperand(1)))
if (CPN->getType()->getAddressSpace() == 0)
if (ConstantPointerNull *CPN =
dyn_cast<ConstantPointerNull>(I->getOperand(1)))
if (CPN->getType()->getAddressSpace() == 0)
if (isNoAliasCall(V->stripPointerCasts()))
break;
// Otherwise, be conservative. There are crazy ways to capture pointers
// using comparisons.