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Teach the verifier to enforce that the alignment argument of memory intrinsics must be a power of 2.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230941 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2015-03-02 09:35:06 +00:00
parent 8fae2845b1
commit 132a34981f
2 changed files with 17 additions and 2 deletions
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10
lib/IR/Verifier.cpp
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@ -2796,14 +2796,20 @@ void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
} break;
case Intrinsic::memcpy:
case Intrinsic::memmove:
case Intrinsic::memset:
Assert1(isa<ConstantInt>(CI.getArgOperand(3)),
case Intrinsic::memset: {
ConstantInt *AlignCI = dyn_cast<ConstantInt>(CI.getArgOperand(3));
Assert1(AlignCI,
"alignment argument of memory intrinsics must be a constant int",
&CI);
const APInt &AlignVal = AlignCI->getValue();
Assert1(AlignCI->isZero() || AlignVal.isPowerOf2(),
"alignment argument of memory intrinsics must be a power of 2",
&CI);
Assert1(isa<ConstantInt>(CI.getArgOperand(4)),
"isvolatile argument of memory intrinsics must be a constant int",
&CI);
break;
}
case Intrinsic::gcroot:
case Intrinsic::gcwrite:
case Intrinsic::gcread:

9
test/Verifier/memcpy.ll Normal file
View File

@ -0,0 +1,9 @@
; RUN: not opt -verify < %s 2>&1 | FileCheck %s
; CHECK: alignment argument of memory intrinsics must be a power of 2
define void @foo(i8* %P, i8* %Q) {
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %P, i8* %Q, i32 4, i32 3, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind