1 ; RUN: opt < %s -asan -asan-module -S | FileCheck %s 2 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" 3 target triple = "x86_64-unknown-linux-gnu" 4 @xxx = internal global i32 0, align 4 ; With dynamic initializer. 5 @XXX = global i32 0, align 4 ; With dynamic initializer. 6 @yyy = internal global i32 0, align 4 ; W/o dynamic initializer. 7 @YYY = global i32 0, align 4 ; W/o dynamic initializer. 8 ; Clang will emit the following metadata identifying @xxx as dynamically 9 ; initialized. 10 !0 = !{i32* @xxx, null, null, i1 true, i1 false} 11 !1 = !{i32* @XXX, null, null, i1 true, i1 false} 12 !2 = !{i32* @yyy, null, null, i1 false, i1 false} 13 !3 = !{i32* @YYY, null, null, i1 false, i1 false} 14 !llvm.asan.globals = !{!0, !1, !2, !3} 15 16 define i32 @initializer() uwtable { 17 entry: 18 ret i32 42 19 } 20 21 define internal void @__cxx_global_var_init() section ".text.startup" { 22 entry: 23 %call = call i32 @initializer() 24 store i32 %call, i32* @xxx, align 4 25 ret void 26 } 27 28 @llvm.global_ctors = appending global [2 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @__late_ctor }, { i32, void ()* } { i32 0, void ()* @__early_ctor }] 29 30 define internal void @__late_ctor() sanitize_address section ".text.startup" { 31 entry: 32 call void @__cxx_global_var_init() 33 ret void 34 } 35 36 ; Clang indicated that @xxx was dynamically initailized. 37 ; __asan_{before,after}_dynamic_init should be called from __late_ctor 38 39 ; CHECK-LABEL: define internal void @__late_ctor 40 ; CHECK-NOT: ret 41 ; CHECK: call void @__asan_before_dynamic_init 42 ; CHECK: call void @__cxx_global_var_init 43 ; CHECK: call void @__asan_after_dynamic_init 44 ; CHECK: ret 45 46 ; CTOR with priority 0 should not be instrumented. 47 define internal void @__early_ctor() sanitize_address section ".text.startup" { 48 entry: 49 call void @__cxx_global_var_init() 50 ret void 51 } 52 ; CHECK-LABEL: define internal void @__early_ctor 53 ; CHECK-NOT: __asan 54 ; CHECK: ret 55 56 ; Check that xxx is instrumented. 57 define void @touch_xxx() sanitize_address { 58 store i32 0, i32 *@xxx, align 4 59 ret void 60 ; CHECK-LABEL: touch_xxx 61 ; CHECK: call void @__asan_report_store4 62 ; CHECK: ret void 63 } 64 65 ; Check that XXX is instrumented. 66 define void @touch_XXX() sanitize_address { 67 store i32 0, i32 *@XXX, align 4 68 ret void 69 ; CHECK: define void @touch_XXX 70 ; CHECK: call void @__asan_report_store4 71 ; CHECK: ret void 72 } 73 74 75 ; Check that yyy is NOT instrumented (as it does not have dynamic initializer). 76 define void @touch_yyy() sanitize_address { 77 store i32 0, i32 *@yyy, align 4 78 ret void 79 ; CHECK: define void @touch_yyy 80 ; CHECK-NOT: call void @__asan_report_store4 81 ; CHECK: ret void 82 } 83 84 ; Check that YYY is NOT instrumented (as it does not have dynamic initializer). 85 define void @touch_YYY() sanitize_address { 86 store i32 0, i32 *@YYY, align 4 87 ret void 88 ; CHECK: define void @touch_YYY 89 ; CHECK-NOT: call void @__asan_report_store4 90 ; CHECK: ret void 91 } 92
