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[msan] Fix handling of array types.

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Switch array type shadow from a single integer to
an array of integers (i.e. make it per-element).
This simplifies instrumentation of extractvalue and fixes PR20493.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214398 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov 2014-07-31 11:02:27 +00:00
parent 8a78bb9836
commit 7ee4f09c94
2 changed files with 105 additions and 5 deletions
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21
lib/Transforms/Instrumentation/MemorySanitizer.cpp
View File

@ -763,6 +763,10 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
return VectorType::get(IntegerType::get(*MS.C, EltSize),
VT->getNumElements());
}
if (ArrayType *AT = dyn_cast<ArrayType>(OrigTy)) {
return ArrayType::get(getShadowTy(AT->getElementType()),
AT->getNumElements());
}
if (StructType *ST = dyn_cast<StructType>(OrigTy)) {
SmallVector<Type*, 4> Elements;
for (unsigned i = 0, n = ST->getNumElements(); i < n; i++)
@ -882,11 +886,18 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
assert(ShadowTy);
if (isa<IntegerType>(ShadowTy) || isa<VectorType>(ShadowTy))
return Constant::getAllOnesValue(ShadowTy);
StructType *ST = cast<StructType>(ShadowTy);
SmallVector<Constant *, 4> Vals;
for (unsigned i = 0, n = ST->getNumElements(); i < n; i++)
Vals.push_back(getPoisonedShadow(ST->getElementType(i)));
return ConstantStruct::get(ST, Vals);
if (ArrayType *AT = dyn_cast<ArrayType>(ShadowTy)) {
SmallVector<Constant *, 4> Vals(AT->getNumElements(),
getPoisonedShadow(AT->getElementType()));
return ConstantArray::get(AT, Vals);
}
if (StructType *ST = dyn_cast<StructType>(ShadowTy)) {
SmallVector<Constant *, 4> Vals;
for (unsigned i = 0, n = ST->getNumElements(); i < n; i++)
Vals.push_back(getPoisonedShadow(ST->getElementType(i)));
return ConstantStruct::get(ST, Vals);
}
llvm_unreachable("Unexpected shadow type");
}
/// \brief Create a dirty shadow for a given value.

89
test/Instrumentation/MemorySanitizer/array_types.ll Normal file
View File

@ -0,0 +1,89 @@
; RUN: opt < %s -msan -msan-check-access-address=0 -S | FileCheck %s
; RUN: opt < %s -msan -msan-check-access-address=0 -msan-track-origins=1 -S | FileCheck -check-prefix=CHECK -check-prefix=CHECK-ORIGINS %s
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"
define [2 x i32] @InsertValue(i32 %x, i32 %y) sanitize_memory {
entry:
%a = insertvalue [2 x i32] undef, i32 %x, 0
%b = insertvalue [2 x i32] %a, i32 %y, 1
ret [2 x i32] %b
}
; CHECK-LABEL: @InsertValue(
; CHECK-DAG: [[Sy:%.*]] = load i32* {{.*}}@__msan_param_tls to i64), i64 8) to i32*)
; CHECK-DAG: [[Sx:%.*]] = load i32* {{.*}}@__msan_param_tls to i32*)
; CHECK: [[A:%.*]] = insertvalue [2 x i32] [i32 -1, i32 -1], i32 [[Sx]], 0
; CHECK: [[B:%.*]] = insertvalue [2 x i32] [[A]], i32 [[Sy]], 1
; CHECK: store [2 x i32] [[B]], [2 x i32]* {{.*}}@__msan_retval_tls
; CHECK: ret [2 x i32]
define [2 x double] @InsertValueDouble(double %x, double %y) sanitize_memory {
entry:
%a = insertvalue [2 x double] undef, double %x, 0
%b = insertvalue [2 x double] %a, double %y, 1
ret [2 x double] %b
}
; CHECK-LABEL: @InsertValueDouble(
; CHECK-DAG: [[Sy:%.*]] = load i64* {{.*}}@__msan_param_tls to i64), i64 8) to i64*)
; CHECK-DAG: [[Sx:%.*]] = load i64* getelementptr {{.*}}@__msan_param_tls, i32 0, i32 0
; CHECK: [[A:%.*]] = insertvalue [2 x i64] [i64 -1, i64 -1], i64 [[Sx]], 0
; CHECK: [[B:%.*]] = insertvalue [2 x i64] [[A]], i64 [[Sy]], 1
; CHECK: store [2 x i64] [[B]], [2 x i64]* {{.*}}@__msan_retval_tls
; CHECK: ret [2 x double]
define i32 @ExtractValue([2 x i32] %a) sanitize_memory {
entry:
%x = extractvalue [2 x i32] %a, 1
ret i32 %x
}
; CHECK-LABEL: @ExtractValue(
; CHECK: [[Sa:%.*]] = load [2 x i32]* {{.*}}@__msan_param_tls to [2 x i32]*)
; CHECK: [[Sx:%.*]] = extractvalue [2 x i32] [[Sa]], 1
; CHECK: store i32 [[Sx]], i32* {{.*}}@__msan_retval_tls
; CHECK: ret i32
; Regression test for PR20493.
%MyStruct = type { i32, i32, [3 x i32] }
define i32 @ArrayInStruct(%MyStruct %s) sanitize_memory {
%x = extractvalue %MyStruct %s, 2, 1
ret i32 %x
}
; CHECK-LABEL: @ArrayInStruct(
; CHECK: [[Ss:%.*]] = load { i32, i32, [3 x i32] }* {{.*}}@__msan_param_tls to { i32, i32, [3 x i32] }*)
; CHECK: [[Sx:%.*]] = extractvalue { i32, i32, [3 x i32] } [[Ss]], 2, 1
; CHECK: store i32 [[Sx]], i32* {{.*}}@__msan_retval_tls
; CHECK: ret i32
define i32 @ArrayOfStructs([3 x { i32, i32 }] %a) sanitize_memory {
%x = extractvalue [3 x { i32, i32 }] %a, 2, 1
ret i32 %x
}
; CHECK-LABEL: @ArrayOfStructs(
; CHECK: [[Ss:%.*]] = load [3 x { i32, i32 }]* {{.*}}@__msan_param_tls to [3 x { i32, i32 }]*)
; CHECK: [[Sx:%.*]] = extractvalue [3 x { i32, i32 }] [[Ss]], 2, 1
; CHECK: store i32 [[Sx]], i32* {{.*}}@__msan_retval_tls
; CHECK: ret i32
define <8 x i16> @ArrayOfVectors([3 x <8 x i16>] %a) sanitize_memory {
%x = extractvalue [3 x <8 x i16>] %a, 1
ret <8 x i16> %x
}
; CHECK-LABEL: @ArrayOfVectors(
; CHECK: [[Ss:%.*]] = load [3 x <8 x i16>]* {{.*}}@__msan_param_tls to [3 x <8 x i16>]*)
; CHECK: [[Sx:%.*]] = extractvalue [3 x <8 x i16>] [[Ss]], 1
; CHECK: store <8 x i16> [[Sx]], <8 x i16>* {{.*}}@__msan_retval_tls
; CHECK: ret <8 x i16>