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 = metadata !{i32* @xxx} 11 !1 = metadata !{i32* @XXX} 12 !llvm.asan.dynamically_initialized_globals = !{!0, !1} 13 14 define i32 @initializer() uwtable { 15 entry: 16 ret i32 42 17 } 18 19 define internal void @__cxx_global_var_init() section ".text.startup" { 20 entry: 21 %call = call i32 @initializer() 22 store i32 %call, i32* @xxx, align 4 23 ret void 24 } 25 26 define internal void @_GLOBAL__I_a() sanitize_address section ".text.startup" { 27 entry: 28 call void @__cxx_global_var_init() 29 ret void 30 } 31 32 ; Clang indicated that @xxx was dynamically initailized. 33 ; __asan_{before,after}_dynamic_init should be called from _GLOBAL__I_a 34 35 ; CHECK: define internal void @_GLOBAL__I_a 36 ; CHECK-NOT: ret 37 ; CHECK: call void @__asan_before_dynamic_init 38 ; CHECK: call void @__cxx_global_var_init 39 ; CHECK: call void @__asan_after_dynamic_init 40 ; CHECK: ret 41 42 ; Check that xxx is instrumented. 43 define void @touch_xxx() sanitize_address { 44 store i32 0, i32 *@xxx, align 4 45 ret void 46 ; CHECK: define void @touch_xxx 47 ; CHECK: call void @__asan_report_store4 48 ; CHECK: ret void 49 } 50 51 ; Check that XXX is instrumented. 52 define void @touch_XXX() sanitize_address { 53 store i32 0, i32 *@XXX, align 4 54 ret void 55 ; CHECK: define void @touch_XXX 56 ; CHECK: call void @__asan_report_store4 57 ; CHECK: ret void 58 } 59 60 61 ; Check that yyy is NOT instrumented (as it does not have dynamic initializer). 62 define void @touch_yyy() sanitize_address { 63 store i32 0, i32 *@yyy, align 4 64 ret void 65 ; CHECK: define void @touch_yyy 66 ; CHECK-NOT: call void @__asan_report_store4 67 ; CHECK: ret void 68 } 69 70 ; Check that YYY is NOT instrumented (as it does not have dynamic initializer). 71 define void @touch_YYY() sanitize_address { 72 store i32 0, i32 *@YYY, align 4 73 ret void 74 ; CHECK: define void @touch_YYY 75 ; CHECK-NOT: call void @__asan_report_store4 76 ; CHECK: ret void 77 } 78
