; RUN: opt < %s -passes=asan -asan-use-after-scope -asan-use-stack-safety=1 -S | FileCheck %s ; Source (-O0 -fsanitize=address -fsanitize-address-use-after-scope): ;; struct S { int x, y; }; ;; void swap(S *a, S *b, bool doit) { ;; if (!doit) ;; return; ;; auto tmp = *a; ;; *a = *b; ;; *b = tmp; ;; } target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-apple-macosx10.14.0" %struct.S = type { i32, i32 } ; CHECK-LABEL: define {{.*}} @_Z4swapP1SS0_b( ; First come the argument allocas. ; CHECK: %a.addr = alloca ptr, align 8 ; CHECK-NEXT: %b.addr = alloca ptr, align 8 ; CHECK-NEXT: %doit.addr = alloca i8, align 1 ; Next, the stores into the argument allocas. ; CHECK-NEXT: store ptr {{.*}}, ptr %a.addr ; CHECK-NEXT: store ptr {{.*}}, ptr %b.addr ; CHECK-NEXT: [[frombool:%.*]] = zext i1 {{.*}} to i8 ; CHECK-NEXT: store i8 %frombool, ptr %doit.addr, align 1 ; CHECK-NEXT: [[stack_base:%.*]] = alloca i64, align 8 define void @_Z4swapP1SS0_b(ptr %a, ptr %b, i1 zeroext %doit) sanitize_address { entry: %a.addr = alloca ptr, align 8 %b.addr = alloca ptr, align 8 %doit.addr = alloca i8, align 1 %tmp = alloca %struct.S, align 4 store ptr %a, ptr %a.addr, align 8 store ptr %b, ptr %b.addr, align 8 %frombool = zext i1 %doit to i8 store i8 %frombool, ptr %doit.addr, align 1 %0 = load i8, ptr %doit.addr, align 1 %tobool = trunc i8 %0 to i1 br i1 %tobool, label %if.end, label %if.then if.then: ; preds = %entry br label %return if.end: ; preds = %entry %1 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %tmp, ptr align 4 %1, i64 8, i1 false) %2 = load ptr, ptr %b.addr, align 8 %3 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %3, ptr align 4 %2, i64 8, i1 false) %4 = load ptr, ptr %b.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %4, ptr align 4 %tmp, i64 8, i1 false) br label %return return: ; preds = %if.end, %if.then ret void } ; Synthetic test case, meant to check that we do not reorder instructions past ; a load when attempting to hoist argument init insts. ; CHECK-LABEL: define {{.*}} @func_with_load_in_arginit_sequence ; CHECK: [[argA:%.*]] = alloca ptr, ; CHECK-NEXT: [[argB:%.*]] = alloca ptr, ; CHECK-NEXT: [[argDoit:%.*]] = alloca i8, ; CHECK-NEXT: %tmp = alloca %struct.S, align 4 ; CHECK-NEXT: store ptr {{.*}}, ptr [[argA]] ; CHECK-NEXT: store ptr {{.*}}, ptr [[argB]] ; CHECK-NEXT: %0 = load i8, ptr %doit.addr, align 1 ; CHECK-NEXT: %frombool = zext i1 %doit to i8 ; CHECK-NEXT: store i8 %frombool, ptr %doit.addr, align 1 define void @func_with_load_in_arginit_sequence(ptr %a, ptr %b, i1 zeroext %doit) sanitize_address { entry: %a.addr = alloca ptr, align 8 %b.addr = alloca ptr, align 8 %doit.addr = alloca i8, align 1 %tmp = alloca %struct.S, align 4 store ptr %a, ptr %a.addr, align 8 store ptr %b, ptr %b.addr, align 8 ; This load prevents the next argument init sequence from being moved. %0 = load i8, ptr %doit.addr, align 1 %frombool = zext i1 %doit to i8 store i8 %frombool, ptr %doit.addr, align 1 %tobool = trunc i8 %0 to i1 br i1 %tobool, label %if.end, label %if.then if.then: ; preds = %entry br label %return if.end: ; preds = %entry %1 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %tmp, ptr align 4 %1, i64 8, i1 false) %2 = load ptr, ptr %b.addr, align 8 %3 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %3, ptr align 4 %2, i64 8, i1 false) %4 = load ptr, ptr %b.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %4, ptr align 4 %tmp, i64 8, i1 false) br label %return return: ; preds = %if.end, %if.then ret void } ; Synthetic test case, meant to check that we can handle functions with more ; than one interesting alloca. ; CHECK-LABEL: define {{.*}} @func_with_multiple_interesting_allocas ; CHECK: [[argA:%.*]] = alloca ptr, ; CHECK-NEXT: [[argB:%.*]] = alloca ptr, ; CHECK-NEXT: [[argDoit:%.*]] = alloca i8, ; CHECK-NEXT: %tmp = alloca %struct.S, align 4 ; CHECK-NEXT: %tmp2 = alloca %struct.S, align 4 ; CHECK-NEXT: store ptr {{.*}}, ptr [[argA]] ; CHECK-NEXT: store ptr {{.*}}, ptr [[argB]] ; CHECK-NEXT: [[frombool:%.*]] = zext i1 {{.*}} to i8 ; CHECK-NEXT: store i8 [[frombool]], ptr [[argDoit]] ; CHECK-NEXT: %0 = load i8, ptr %doit.addr, align 1 define void @func_with_multiple_interesting_allocas(ptr %a, ptr %b, i1 zeroext %doit) sanitize_address { entry: %a.addr = alloca ptr, align 8 %b.addr = alloca ptr, align 8 %doit.addr = alloca i8, align 1 %tmp = alloca %struct.S, align 4 %tmp2 = alloca %struct.S, align 4 store ptr %a, ptr %a.addr, align 8 store ptr %b, ptr %b.addr, align 8 %frombool = zext i1 %doit to i8 store i8 %frombool, ptr %doit.addr, align 1 %0 = load i8, ptr %doit.addr, align 1 %tobool = trunc i8 %0 to i1 br i1 %tobool, label %if.end, label %if.then if.then: ; preds = %entry br label %return if.end: ; preds = %entry %1 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %tmp, ptr align 4 %1, i64 8, i1 false) %2 = load ptr, ptr %b.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %tmp2, ptr align 4 %2, i64 8, i1 false) %3 = load ptr, ptr %b.addr, align 8 %4 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %4, ptr align 4 %3, i64 8, i1 false) %5 = load ptr, ptr %b.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %5, ptr align 4 %tmp, i64 8, i1 false) %6 = load ptr, ptr %a.addr, align 8 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %6, ptr align 4 %tmp2, i64 8, i1 false) br label %return return: ; preds = %if.end, %if.then ret void } declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)