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[msan] Only check shadow memory for operands that are sized.

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Fixes PR33347: https://bugs.llvm.org/show_bug.cgi?id=33347.

Differential Revision: https://reviews.llvm.org/D35160

Patch by Matt Morehouse.

llvm-svn: 307684
This commit is contained in:
Evgeniy Stepanov 2017-07-11 18:13:52 +00:00
parent 5df3c2db91
commit 56db4777f8
2 changed files with 27 additions and 2 deletions
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7
lib/Transforms/Instrumentation/MemorySanitizer.cpp
View File

@ -2918,8 +2918,11 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
if (ClDumpStrictInstructions)
dumpInst(I);
DEBUG(dbgs() << "DEFAULT: " << I << "\n");
for (size_t i = 0, n = I.getNumOperands(); i < n; i++)
insertShadowCheck(I.getOperand(i), &I);
for (size_t i = 0, n = I.getNumOperands(); i < n; i++) {
Value *Operand = I.getOperand(i);
if (Operand->getType()->isSized())
insertShadowCheck(Operand, &I);
}
setShadow(&I, getCleanShadow(&I));
setOrigin(&I, getCleanOrigin());
}

22
test/Instrumentation/MemorySanitizer/unsized_type.ll Normal file
View File

@ -0,0 +1,22 @@
; Check that unsized token types used by coroutine intrinsics do not cause
; assertion failures.
; RUN: opt < %s -msan -S 2>&1 | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare token @llvm.coro.id(i32, i8* readnone, i8* nocapture readonly, i8*)
declare i1 @llvm.coro.alloc(token)
define void @foo() sanitize_memory {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%dyn.alloc.reqd = call i1 @llvm.coro.alloc(token %id)
ret void
}
; CHECK: define void @foo
; CHECK-NEXT: entry:
; CHECK-NEXT: %id = call token @llvm.coro.id
; CHECK-NEXT: call i1 @llvm.coro.alloc(token %id)
; CHECK-NEXT: ret void