vsk updated this revision to Diff 92572.
vsk added a comment.
Add a test which shows that we don't regress alignment-checking when accessing
extern variables.
https://reviews.llvm.org/D30283
Files:
lib/CodeGen/CGExpr.cpp
lib/CodeGen/CGExprCXX.cpp
lib/CodeGen/CodeGenFunction.cpp
test/CodeGen/catch-undef-behavior.c
test/CodeGen/sanitize-recover.c
test/CodeGenCXX/ubsan-global-alignment.cpp
test/CodeGenCXX/ubsan-suppress-checks.cpp
test/CodeGenCXX/ubsan-suppress-null-checks.cpp
test/CodeGenCXX/ubsan-type-checks.cpp
Index: test/CodeGenCXX/ubsan-type-checks.cpp
===================================================================
--- test/CodeGenCXX/ubsan-type-checks.cpp
+++ test/CodeGenCXX/ubsan-type-checks.cpp
@@ -5,8 +5,8 @@
struct A {
// COMMON-LABEL: define linkonce_odr void @_ZN1A10do_nothingEv
void do_nothing() {
- // ALIGN-NOT: ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
- // ALIGN-NOT: and i64 %{{.*}}, 7, !nosanitize
+ // ALIGN: ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %{{.*}}, 0, !nosanitize
// NULL: icmp ne %struct.A* %{{.*}}, null, !nosanitize
Index: test/CodeGenCXX/ubsan-suppress-checks.cpp
===================================================================
--- test/CodeGenCXX/ubsan-suppress-checks.cpp
+++ test/CodeGenCXX/ubsan-suppress-checks.cpp
@@ -1,24 +1,28 @@
-// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=null | FileCheck %s
-// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=null -DCHECK_LAMBDA | FileCheck %s --check-prefix=LAMBDA
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=alignment | FileCheck %s --check-prefixes=CHECK,ALIGN
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=null | FileCheck %s --check-prefixes=CHECK,NULL
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=alignment,null -DCHECK_LAMBDA | FileCheck %s --check-prefixes=LAMBDA
struct A {
int foo;
// CHECK-LABEL: define linkonce_odr void @_ZN1A10do_nothingEv
void do_nothing() {
- // CHECK: icmp ne %struct.A* %[[THIS1:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.A* %[[THIS1]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT1:[0-9]+]] = ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT1]], 3, !nosanitize
+ // NULL: icmp ne %struct.A* %[[THIS1:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.A* %[[THIS1]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
// CHECK: ret void
}
#ifdef CHECK_LAMBDA
// LAMBDA-LABEL: define linkonce_odr void @_ZN1A22do_nothing_with_lambdaEv
void do_nothing_with_lambda() {
// LAMBDA: icmp ne %struct.A* %[[THIS2:[a-z0-9]+]], null, !nosanitize
- // LAMBDA: ptrtoint %struct.A* %[[THIS2]] to i64, !nosanitize
- // LAMBDA-NEXT: call void @__ubsan_handle_type_mismatch
+ // LAMBDA: %[[THISINT2:[0-9]+]] = ptrtoint %struct.A* %[[THIS2]] to i64, !nosanitize
+ // LAMBDA: and i64 %[[THISINT2]], 3, !nosanitize
+ // LAMBDA: call void @__ubsan_handle_type_mismatch
auto f = [&] {
foo = 0;
@@ -38,49 +42,59 @@
// CHECK-LABEL: define linkonce_odr i32 @_ZN1A11load_memberEv
int load_member() {
- // CHECK: icmp ne %struct.A* %[[THIS3:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.A* %[[THIS3]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT3:[0-9]+]] = ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT3]], 3, !nosanitize
+ // NULL: icmp ne %struct.A* %[[THIS3:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.A* %[[THIS3]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
return foo;
// CHECK: ret i32
}
// CHECK-LABEL: define linkonce_odr i32 @_ZN1A11call_methodEv
int call_method() {
- // CHECK: icmp ne %struct.A* %[[THIS4:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.A* %[[THIS4]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT4:[0-9]+]] = ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT4]], 3, !nosanitize
+ // NULL: icmp ne %struct.A* %[[THIS4:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.A* %[[THIS4]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
return load_member();
// CHECK: ret i32
}
// CHECK-LABEL: define linkonce_odr void @_ZN1A15assign_member_1Ev
void assign_member_1() {
- // CHECK: icmp ne %struct.A* %[[THIS5:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.A* %[[THIS5]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT5:[0-9]+]] = ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT5]], 3, !nosanitize
+ // NULL: icmp ne %struct.A* %[[THIS5:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.A* %[[THIS5]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
foo = 0;
// CHECK: ret void
}
// CHECK-LABEL: define linkonce_odr void @_ZN1A15assign_member_2Ev
void assign_member_2() {
- // CHECK: icmp ne %struct.A* %[[THIS6:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.A* %[[THIS6]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT6:[0-9]+]] = ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT6]], 3, !nosanitize
+ // NULL: icmp ne %struct.A* %[[THIS6:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.A* %[[THIS6]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
(__extension__ (this))->foo = 0;
// CHECK: ret void
}
// CHECK-LABEL: define linkonce_odr void @_ZNK1A15assign_member_3Ev
void assign_member_3() const {
- // CHECK: icmp ne %struct.A* %[[THIS7:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.A* %[[THIS7]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT7:[0-9]+]] = ptrtoint %struct.A* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT7]], 3, !nosanitize
+ // NULL: icmp ne %struct.A* %[[THIS7:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.A* %[[THIS7]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
const_cast<A *>(this)->foo = 0;
// CHECK: ret void
@@ -106,10 +120,10 @@
// CHECK-LABEL: define linkonce_odr i32 @_ZN1B11load_memberEv
static int load_member() {
- // Null-check &b before converting it to an A*.
+ // Check &b before converting it to an A*.
// CHECK: call void @__ubsan_handle_type_mismatch
//
- // Null-check the result of the conversion before using it.
+ // Check the result of the conversion before using it.
// CHECK: call void @__ubsan_handle_type_mismatch
//
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
@@ -130,11 +144,14 @@
// CHECK-LABEL: define linkonce_odr i32 @_ZN7Derived13load_member_2Ev
int load_member_2() {
- // CHECK: icmp ne %struct.Derived* %[[THIS8:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.Derived* %[[THIS8]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT8:[0-9]+]] = ptrtoint %struct.Derived* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT8]], 7, !nosanitize
+ // ALIGN: call void @__ubsan_handle_type_mismatch
+ // NULL: icmp ne %struct.Derived* %[[THIS8:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.Derived* %[[THIS8]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
//
- // Null-check the result of the cast before using it.
+ // Check the result of the cast before using it.
// CHECK: call void @__ubsan_handle_type_mismatch
//
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
@@ -144,19 +161,26 @@
// CHECK-LABEL: define linkonce_odr i32 @_ZN7Derived13load_member_3Ev
int load_member_3() {
- // CHECK: icmp ne %struct.Derived* %[[THIS9:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.Derived* %[[THIS9]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT9:[0-9]+]] = ptrtoint %struct.Derived* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT9]], 7, !nosanitize
+ // ALIGN: call void @__ubsan_handle_type_mismatch
+ // ALIGN: call void @__ubsan_handle_type_mismatch
+ // NULL: icmp ne %struct.Derived* %[[THIS9:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.Derived* %[[THIS9]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
return reinterpret_cast<Derived *>(static_cast<Base *>(this))->foo;
// CHECK: ret i32
}
// CHECK-LABEL: define linkonce_odr i32 @_ZN7Derived13load_member_1Ev
int load_member_1() override {
- // CHECK: icmp ne %struct.Derived* %[[THIS10:[a-z0-9]+]], null, !nosanitize
- // CHECK: ptrtoint %struct.Derived* %[[THIS10]] to i64, !nosanitize
- // CHECK-NEXT: call void @__ubsan_handle_type_mismatch
+ // ALIGN: %[[THISINT10:[0-9]+]] = ptrtoint %struct.Derived* %{{.*}} to i64, !nosanitize
+ // ALIGN: and i64 %[[THISINT10]], 7, !nosanitize
+ // ALIGN: call void @__ubsan_handle_type_mismatch
+ // NULL: icmp ne %struct.Derived* %[[THIS10:[a-z0-9]+]], null, !nosanitize
+ // NULL: ptrtoint %struct.Derived* %[[THIS10]] to i64, !nosanitize
+ // CHECK: call void @__ubsan_handle_type_mismatch
// CHECK-NOT: call void @__ubsan_handle_type_mismatch
return foo + bar;
// CHECK: ret i32
Index: test/CodeGenCXX/ubsan-global-alignment.cpp
===================================================================
--- /dev/null
+++ test/CodeGenCXX/ubsan-global-alignment.cpp
@@ -0,0 +1,42 @@
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=alignment | FileCheck %s
+
+struct S1 {
+ long long L;
+};
+
+extern int int_array[];
+extern S1 S1_array[];
+extern S1 *S1ptr_array[];
+
+// CHECK-LABEL: define i32 @_Z15index_int_arrayi
+int index_int_array(int I) {
+ // CHECK: [[ARRAYIDX:%.*]] = getelementptr inbounds [0 x i32], [0 x i32]* @int_array, i64 0
+ // CHECK-NEXT: [[PTRTOINT:%.*]] = ptrtoint i32* [[ARRAYIDX]] to i64, !nosanitize
+ // CHECK-NEXT: [[AND:%.*]] = and i64 [[PTRTOINT]], 3, !nosanitize
+ // CHECK-NEXT: [[ICMP:%.*]] = icmp eq i64 [[AND]], 0, !nosanitize
+ // CHECK-NEXT: br i1 [[ICMP]]
+ // CHECK: call void @__ubsan_handle_type_mismatch
+ return int_array[I];
+}
+
+// CHECK-LABEL: define i64 @_Z14index_S1_arrayi
+long long index_S1_array(int I) {
+ // CHECK: [[L:%.*]] = getelementptr inbounds %struct.S1, %struct.S1* {{.*}}, i32 0, i32 0
+ // CHECK-NEXT: [[PTRTOINT:%.*]] = ptrtoint i64* [[L]] to i64, !nosanitize
+ // CHECK-NEXT: [[AND:%.*]] = and i64 [[PTRTOINT]], 7, !nosanitize
+ // CHECK-NEXT: [[ICMP:%.*]] = icmp eq i64 [[AND]], 0, !nosanitize
+ // CHECK-NEXT: br i1 [[ICMP]]
+ // CHECK: call void @__ubsan_handle_type_mismatch
+ return S1_array[I].L;
+}
+
+// CHECK-LABEL: define i64 @_Z17index_S1ptr_arrayi
+long long index_S1ptr_array(int I) {
+ // CHECK: [[L:%.*]] = getelementptr inbounds %struct.S1, %struct.S1* {{.*}}, i32 0, i32 0
+ // CHECK-NEXT: [[PTRTOINT:%.*]] = ptrtoint i64* [[L]] to i64, !nosanitize
+ // CHECK-NEXT: [[AND:%.*]] = and i64 [[PTRTOINT]], 7, !nosanitize
+ // CHECK-NEXT: [[ICMP:%.*]] = icmp eq i64 [[AND]], 0, !nosanitize
+ // CHECK-NEXT: br i1 [[ICMP]]
+ // CHECK: call void @__ubsan_handle_type_mismatch
+ return S1ptr_array[I]->L;
+}
Index: test/CodeGen/sanitize-recover.c
===================================================================
--- test/CodeGen/sanitize-recover.c
+++ test/CodeGen/sanitize-recover.c
@@ -22,15 +22,7 @@
// PARTIAL: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
// PARTIAL-NEXT: %[[CHECK0:.*]] = icmp uge i64 %[[SIZE]], 4
- // PARTIAL: %[[MISALIGN:.*]] = and i64 {{.*}}, 3
- // PARTIAL-NEXT: %[[CHECK1:.*]] = icmp eq i64 %[[MISALIGN]], 0
+ // PARTIAL: br i1 %[[CHECK0]], {{.*}} !nosanitize
- // PARTIAL: %[[CHECK01:.*]] = and i1 %[[CHECK1]], %[[CHECK0]]
-
- // PARTIAL: br i1 %[[CHECK01]], {{.*}} !nosanitize
- // PARTIAL: br i1 %[[CHECK1]], {{.*}} !nosanitize
-
- // PARTIAL: call void @__ubsan_handle_type_mismatch_v1_abort(
- // PARTIAL-NEXT: unreachable
// PARTIAL: call void @__ubsan_handle_type_mismatch_v1(
}
Index: test/CodeGen/catch-undef-behavior.c
===================================================================
--- test/CodeGen/catch-undef-behavior.c
+++ test/CodeGen/catch-undef-behavior.c
@@ -5,7 +5,7 @@
// CHECK-UBSAN: @[[INT:.*]] = private unnamed_addr constant { i16, i16, [6 x i8] } { i16 0, i16 11, [6 x i8] c"'int'\00" }
// FIXME: When we only emit each type once, use [[INT]] more below.
-// CHECK-UBSAN: @[[LINE_100:.*]] = private unnamed_addr global {{.*}}, i32 100, i32 5 {{.*}} @[[INT]], i8 2, i8 1
+// CHECK-UBSAN: @[[LINE_100:.*]] = private unnamed_addr global {{.*}}, i32 100, i32 5 {{.*}} @[[INT]], i8 1, i8 1
// CHECK-UBSAN: @[[LINE_200:.*]] = {{.*}}, i32 200, i32 10 {{.*}}, i8 2, i8 0
// CHECK-UBSAN: @[[LINE_300:.*]] = {{.*}}, i32 300, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
// CHECK-UBSAN: @[[LINE_400:.*]] = {{.*}}, i32 400, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
@@ -38,14 +38,7 @@
// CHECK-COMMON-NEXT: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64.p0i8(i8* %[[I8PTR]], i1 false)
// CHECK-COMMON-NEXT: %[[CHECK0:.*]] = icmp uge i64 %[[SIZE]], 4
- // CHECK-COMMON: %[[PTRTOINT:.*]] = ptrtoint {{.*}}* %[[PTR]] to i64
- // CHECK-COMMON-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRTOINT]], 3
- // CHECK-COMMON-NEXT: %[[CHECK1:.*]] = icmp eq i64 %[[MISALIGN]], 0
-
- // CHECK-COMMON: %[[OK:.*]] = and i1 %[[CHECK0]], %[[CHECK1]]
-
- // CHECK-UBSAN: br i1 %[[OK]], {{.*}} !prof ![[WEIGHT_MD:.*]], !nosanitize
- // CHECK-TRAP: br i1 %[[OK]], {{.*}}
+ // CHECK-UBSAN: br i1 %[[CHECK0]], {{.*}} !prof ![[WEIGHT_MD:.*]], !nosanitize
// CHECK-UBSAN: %[[ARG:.*]] = ptrtoint {{.*}} %[[PTR]] to i64
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_type_mismatch_v1(i8* bitcast ({{.*}} @[[LINE_100]] to i8*), i64 %[[ARG]])
Index: lib/CodeGen/CodeGenFunction.cpp
===================================================================
--- lib/CodeGen/CodeGenFunction.cpp
+++ lib/CodeGen/CodeGenFunction.cpp
@@ -967,13 +967,14 @@
CXXThisValue = CXXABIThisValue;
}
- // Null-check the 'this' pointer once per function, if it's available.
+ // Check the 'this' pointer once per function, if it's available.
if (CXXThisValue) {
SanitizerSet SkippedChecks;
- SkippedChecks.set(SanitizerKind::Alignment, true);
SkippedChecks.set(SanitizerKind::ObjectSize, true);
- EmitTypeCheck(TCK_Load, Loc, CXXThisValue, MD->getThisType(getContext()),
- /*Alignment=*/CharUnits::Zero(), SkippedChecks);
+ QualType ThisTy = MD->getThisType(getContext());
+ EmitTypeCheck(TCK_Load, Loc, CXXThisValue, ThisTy,
+ getContext().getTypeAlignInChars(ThisTy->getPointeeType()),
+ SkippedChecks);
}
}
Index: lib/CodeGen/CGExprCXX.cpp
===================================================================
--- lib/CodeGen/CGExprCXX.cpp
+++ lib/CodeGen/CGExprCXX.cpp
@@ -301,9 +301,13 @@
CallLoc = CE->getExprLoc();
SanitizerSet SkippedChecks;
- if (const auto *CMCE = dyn_cast<CXXMemberCallExpr>(CE))
- if (IsDeclRefOrWrappedCXXThis(CMCE->getImplicitObjectArgument()))
+ if (const auto *CMCE = dyn_cast<CXXMemberCallExpr>(CE)) {
+ auto *IOA = CMCE->getImplicitObjectArgument();
+ if (IsDeclRefOrWrappedCXXThis(IOA)) {
+ SkippedChecks.set(SanitizerKind::Alignment, true);
SkippedChecks.set(SanitizerKind::Null, true);
+ }
+ }
EmitTypeCheck(
isa<CXXConstructorDecl>(CalleeDecl) ? CodeGenFunction::TCK_ConstructorCall
: CodeGenFunction::TCK_MemberCall,
Index: lib/CodeGen/CGExpr.cpp
===================================================================
--- lib/CodeGen/CGExpr.cpp
+++ lib/CodeGen/CGExpr.cpp
@@ -986,9 +986,12 @@
LV = EmitLValue(E);
if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
SanitizerSet SkippedChecks;
- if (const auto *ME = dyn_cast<MemberExpr>(E))
- if (IsDeclRefOrWrappedCXXThis(ME->getBase()))
+ if (const auto *ME = dyn_cast<MemberExpr>(E)) {
+ if (IsDeclRefOrWrappedCXXThis(ME->getBase())) {
+ SkippedChecks.set(SanitizerKind::Alignment, true);
SkippedChecks.set(SanitizerKind::Null, true);
+ }
+ }
EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(),
E->getType(), LV.getAlignment(), SkippedChecks);
}
@@ -3406,8 +3409,10 @@
Address Addr = EmitPointerWithAlignment(BaseExpr, &AlignSource);
QualType PtrTy = BaseExpr->getType()->getPointeeType();
SanitizerSet SkippedChecks;
- if (IsDeclRefOrWrappedCXXThis(BaseExpr))
+ if (IsDeclRefOrWrappedCXXThis(BaseExpr)) {
+ SkippedChecks.set(SanitizerKind::Alignment, true);
SkippedChecks.set(SanitizerKind::Null, true);
+ }
EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
/*Alignment=*/CharUnits::Zero(), SkippedChecks);
BaseLV = MakeAddrLValue(Addr, PtrTy, AlignSource);
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