1; RUN: opt < %s -asan -asan-module -S | FileCheck %s 2target 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" 3target 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 16define i32 @initializer() uwtable { 17entry: 18 ret i32 42 19} 20 21define internal void @__cxx_global_var_init() section ".text.startup" { 22entry: 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 30define internal void @__late_ctor() sanitize_address section ".text.startup" { 31entry: 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. 47define internal void @__early_ctor() sanitize_address section ".text.startup" { 48entry: 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. 57define 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. 66define 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). 76define 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). 85define 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