[llvm-commits] [llvm] r105288 - /llvm/trunk/lib/Analysis/Lint.cpp
Dan Gohman
gohman at apple.com
Tue Jun 1 13:51:40 PDT 2010
Author: djg
Date: Tue Jun 1 15:51:40 2010
New Revision: 105288
URL: http://llvm.org/viewvc/llvm-project?rev=105288&view=rev
Log:
Fix the noalias checking so that it doesn't worry about
an argument aliasing itself. Thanks Duncan!
Modified:
llvm/trunk/lib/Analysis/Lint.cpp
Modified: llvm/trunk/lib/Analysis/Lint.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/Lint.cpp?rev=105288&r1=105287&r2=105288&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/Lint.cpp (original)
+++ llvm/trunk/lib/Analysis/Lint.cpp Tue Jun 1 15:51:40 2010
@@ -215,7 +215,6 @@
const FunctionType *FT = F->getFunctionType();
unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin());
- std::vector<Value *> NoAliasVals;
Assert1(FT->isVarArg() ?
FT->getNumParams() <= NumActualArgs :
@@ -233,8 +232,19 @@
Assert1(Formal->getType() == Actual->getType(),
"Undefined behavior: Call argument type mismatches "
"callee parameter type", &I);
+
+ // Check that noalias arguments don't alias other arguments. The
+ // AliasAnalysis API isn't expressive enough for what we really want
+ // to do. Known partial overlap is not distinguished from the case
+ // where nothing is known.
if (Formal->hasNoAliasAttr() && Actual->getType()->isPointerTy())
- NoAliasVals.push_back(Actual);
+ for (CallSite::arg_iterator BI = CS.arg_begin(); BI != AE; ++BI) {
+ Assert1(AI == BI ||
+ AA->alias(*AI, ~0u, *BI, ~0u) != AliasAnalysis::MustAlias,
+ "Unusual: noalias argument aliases another argument", &I);
+ }
+
+ // Check that an sret argument points to valid memory.
if (Formal->hasStructRetAttr() && Actual->getType()->isPointerTy()) {
const Type *Ty =
cast<PointerType>(Formal->getType())->getElementType();
@@ -244,16 +254,6 @@
}
}
}
-
- // Check that the noalias arguments don't overlap. The AliasAnalysis API
- // isn't expressive enough for what we really want to do. Known partial
- // overlap is not distinguished from the case where nothing is known.
- for (CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
- AI != AE; ++AI)
- for (std::vector<Value *>::iterator J = NoAliasVals.begin(),
- E = NoAliasVals.end(); J != E; ++J)
- Assert1(AA->alias(*J, ~0u, *AI, ~0u) != AliasAnalysis::MustAlias,
- "Unusual: noalias argument aliases another argument", &I);
}
if (CS.isCall() && cast<CallInst>(CS.getInstruction())->isTailCall())
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