| ; RUN: opt < %s -asan -asan-module -asan-stack-dynamic-alloca \ |
| ; RUN: -asan-use-after-return -S | FileCheck %s |
| ; RUN: opt < %s -asan -asan-module -asan-stack-dynamic-alloca -asan-mapping-scale=5 \ |
| ; RUN: -asan-use-after-return -S | FileCheck %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 void @Func1() sanitize_address { |
| entry: |
| ; CHECK-LABEL: Func1 |
| |
| ; CHECK: entry: |
| ; CHECK: load i32, i32* @__asan_option_detect_stack_use_after_return |
| |
| ; CHECK: <label>:[[UAR_ENABLED_BB:[0-9]+]] |
| ; CHECK: [[FAKE_STACK_RT:%[0-9]+]] = call i64 @__asan_stack_malloc_ |
| |
| ; CHECK: <label>:[[FAKE_STACK_BB:[0-9]+]] |
| ; CHECK: [[FAKE_STACK:%[0-9]+]] = phi i64 [ 0, %entry ], [ [[FAKE_STACK_RT]], %[[UAR_ENABLED_BB]] ] |
| ; CHECK: icmp eq i64 [[FAKE_STACK]], 0 |
| |
| ; CHECK: <label>:[[NO_FAKE_STACK_BB:[0-9]+]] |
| ; CHECK: %MyAlloca = alloca i8, i64 |
| ; CHECK: [[ALLOCA:%[0-9]+]] = ptrtoint i8* %MyAlloca |
| |
| ; CHECK: phi i64 [ [[FAKE_STACK]], %[[FAKE_STACK_BB]] ], [ [[ALLOCA]], %[[NO_FAKE_STACK_BB]] ] |
| |
| ; CHECK: ret void |
| |
| %XXX = alloca [20 x i8], align 1 |
| %arr.ptr = bitcast [20 x i8]* %XXX to i8* |
| store volatile i8 0, i8* %arr.ptr |
| ret void |
| } |
| |
| ; Test that dynamic alloca is not used for functions with inline assembly. |
| define void @Func2() sanitize_address { |
| entry: |
| ; CHECK-LABEL: Func2 |
| ; CHECK: alloca [96 x i8] |
| ; CHECK: ret void |
| |
| %XXX = alloca [20 x i8], align 1 |
| %arr.ptr = bitcast [20 x i8]* %XXX to i8* |
| store volatile i8 0, i8* %arr.ptr |
| call void asm sideeffect "mov %%rbx, %%rcx", "~{dirflag},~{fpsr},~{flags}"() nounwind |
| ret void |
| } |
| |
| ; Test that dynamic alloca is not used when setjmp is present. |
| %struct.__jmp_buf_tag = type { [8 x i64], i32, %struct.__sigset_t } |
| %struct.__sigset_t = type { [16 x i64] } |
| @_ZL3buf = internal global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16 |
| |
| define void @Func3() uwtable sanitize_address { |
| ; CHECK-LABEL: define void @Func3 |
| ; CHECK-NOT: __asan_option_detect_stack_use_after_return |
| ; CHECK-NOT: __asan_stack_malloc |
| ; CHECK: call void @__asan_handle_no_return |
| ; CHECK: call void @longjmp |
| ; CHECK: ret void |
| entry: |
| %a = alloca i32, align 4 |
| %call = call i32 @_setjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @_ZL3buf, i32 0, i32 0)) nounwind returns_twice |
| %cmp = icmp eq i32 0, %call |
| br i1 %cmp, label %if.then, label %if.end |
| |
| if.then: ; preds = %entry |
| call void @longjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @_ZL3buf, i32 0, i32 0), i32 1) noreturn nounwind |
| unreachable |
| |
| if.end: ; preds = %entry |
| call void @_Z10escape_ptrPi(i32* %a) |
| ret void |
| } |
| |
| declare i32 @_setjmp(%struct.__jmp_buf_tag*) nounwind returns_twice |
| declare void @longjmp(%struct.__jmp_buf_tag*, i32) noreturn nounwind |
| declare void @_Z10escape_ptrPi(i32*) |