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MSan: Use createSanitizerCtor to create ctor, and call __msan_init

Browse Source 
Reviewers: kcc, eugenis

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8781

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236779 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ismail Pazarbasi 2015-05-07 21:41:52 +00:00
parent 2bdae13eff
commit db5cc208f2
2 changed files with 16 additions and 5 deletions
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15
lib/Transforms/Instrumentation/MemorySanitizer.cpp
View File

@ -191,6 +191,9 @@ static cl::opt<bool> ClCheckConstantShadow("msan-check-constant-shadow",
cl::desc("Insert checks for constant shadow values"),
cl::Hidden, cl::init(false));
static const char *const kMsanModuleCtorName = "msan.module_ctor";
static const char *const kMsanInitName = "__msan_init";
namespace {
// Memory map parameters used in application-to-shadow address calculation.
@ -332,6 +335,7 @@ class MemorySanitizer : public FunctionPass {
MDNode *OriginStoreWeights;
/// \brief An empty volatile inline asm that prevents callback merge.
InlineAsm *EmptyAsm;
Function *MsanCtorFunction;
friend struct MemorySanitizerVisitor;
friend struct VarArgAMD64Helper;
@ -491,9 +495,12 @@ bool MemorySanitizer::doInitialization(Module &M) {
ColdCallWeights = MDBuilder(*C).createBranchWeights(1, 1000);
OriginStoreWeights = MDBuilder(*C).createBranchWeights(1, 1000);
// Insert a call to __msan_init/__msan_track_origins into the module's CTORs.
appendToGlobalCtors(M, cast<Function>(M.getOrInsertFunction(
"__msan_init", IRB.getVoidTy(), nullptr)), 0);
std::tie(MsanCtorFunction, std::ignore) =
createSanitizerCtorAndInitFunctions(M, kMsanModuleCtorName, kMsanInitName,
/*InitArgTypes=*/{},
/*InitArgs=*/{});
appendToGlobalCtors(M, MsanCtorFunction, 0);
if (TrackOrigins)
new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
@ -2983,6 +2990,8 @@ VarArgHelper *CreateVarArgHelper(Function &Func, MemorySanitizer &Msan,
} // namespace
bool MemorySanitizer::runOnFunction(Function &F) {
if (&F == MsanCtorFunction)
return false;
MemorySanitizerVisitor Visitor(F, *this);
// Clear out readonly/readnone attributes.

6
test/Instrumentation/MemorySanitizer/msan_basic.ll
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@ -4,8 +4,7 @@
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Check the presence of __msan_init
; CHECK: @llvm.global_ctors {{.*}} @__msan_init
; CHECK: @llvm.global_ctors {{.*}} @msan.module_ctor
; Check the presence and the linkage type of __msan_track_origins and
; other interface symbols.
@ -878,3 +877,6 @@ define void @MismatchedReturnTypeTailCall(i32 %a) sanitize_memory {
; CHECK-LABEL: define void @MismatchedReturnTypeTailCall
; CHECK: tail call i32 @InnerTailCall
; CHECK: ret void
; CHECK: define internal void @msan.module_ctor
; CHECK: call void @__msan_init()