1 // RUN: %clang_cc1 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefixes=CHECK,CHECK-NOSANITIZE
2 // RUN: %clang_cc1 -fsanitize=alignment -fno-sanitize-recover=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-ANYRECOVER,CHECK-SANITIZE-NORECOVER,CHECK-SANITIZE-UNREACHABLE
3 // RUN: %clang_cc1 -fsanitize=alignment -fsanitize-recover=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-ANYRECOVER,CHECK-SANITIZE-RECOVER
4 // RUN: %clang_cc1 -fsanitize=alignment -fsanitize-trap=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-TRAP,CHECK-SANITIZE-UNREACHABLE
5
6 // CHECK-SANITIZE-ANYRECOVER: @[[CHAR:.*]] = {{.*}} c"'char **'\00" }
7 // CHECK-SANITIZE-ANYRECOVER: @[[LINE_100_ALIGNMENT_ASSUMPTION:.*]] = {{.*}}, i32 100, i32 10 }, {{.*}}* @[[CHAR]] }
8
9 char **__attribute__((alloc_align(2)))
passthrough(char ** x,unsigned long alignment)10 passthrough(char **x, unsigned long alignment) {
11 // CHECK: define i8** @[[PASSTHROUGH:.*]](i8** %[[X:.*]], i64 %[[ALIGNMENT:.*]])
12 // CHECK-NEXT: entry:
13 // CHECK-NEXT: %[[X_ADDR:.*]] = alloca i8**, align 8
14 // CHECK-NEXT: %[[ALIGNMENT_ADDR:.*]] = alloca i64, align 8
15 // CHECK-NEXT: store i8** %[[X]], i8*** %[[X_ADDR]], align 8
16 // CHECK-NEXT: store i64 %[[ALIGNMENT]], i64* %[[ALIGNMENT_ADDR]], align 8
17 // CHECK-NEXT: %[[X_RELOADED:.*]] = load i8**, i8*** %[[X_ADDR]], align 8
18 // CHECK-NEXT: ret i8** %[[X_RELOADED]]
19 // CHECK-NEXT: }
20 return x;
21 }
22
caller(char ** x)23 char **caller(char **x) {
24 // CHECK: define i8** @{{.*}}(i8** %[[X:.*]])
25 // CHECK-NEXT: entry:
26 // CHECK-NEXT: %[[X_ADDR:.*]] = alloca i8**, align 8
27 // CHECK-NEXT: store i8** %[[X]], i8*** %[[X_ADDR]], align 8
28 // CHECK-NEXT: %[[X_RELOADED:.*]] = load i8**, i8*** %[[X_ADDR]], align 8
29 // CHECK-NOSANITIZE-NEXT: %[[X_RETURNED:.*]] = call align 128 i8** @[[PASSTHROUGH]](i8** %[[X_RELOADED]], i64 128)
30 // CHECK-SANITIZE-NEXT: %[[X_RETURNED:.*]] = call i8** @[[PASSTHROUGH]](i8** %[[X_RELOADED]], i64 128)
31 // CHECK-SANITIZE-NEXT: %[[PTRINT:.*]] = ptrtoint i8** %[[X_RETURNED]] to i64
32 // CHECK-SANITIZE-NEXT: %[[MASKEDPTR:.*]] = and i64 %[[PTRINT]], 127
33 // CHECK-SANITIZE-NEXT: %[[MASKCOND:.*]] = icmp eq i64 %[[MASKEDPTR]], 0
34 // CHECK-SANITIZE-NEXT: %[[PTRINT_DUP:.*]] = ptrtoint i8** %[[X_RETURNED]] to i64, !nosanitize
35 // CHECK-SANITIZE-NEXT: br i1 %[[MASKCOND]], label %[[CONT:.*]], label %[[HANDLER_ALIGNMENT_ASSUMPTION:[^,]+]],{{.*}} !nosanitize
36 // CHECK-SANITIZE: [[HANDLER_ALIGNMENT_ASSUMPTION]]:
37 // CHECK-SANITIZE-NORECOVER-NEXT: call void @__ubsan_handle_alignment_assumption_abort(i8* bitcast ({ {{{.*}}}, {{{.*}}}, {{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]], i64 128, i64 0){{.*}}, !nosanitize
38 // CHECK-SANITIZE-RECOVER-NEXT: call void @__ubsan_handle_alignment_assumption(i8* bitcast ({ {{{.*}}}, {{{.*}}}, {{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]], i64 128, i64 0){{.*}}, !nosanitize
39 // CHECK-SANITIZE-TRAP-NEXT: call void @llvm.trap(){{.*}}, !nosanitize
40 // CHECK-SANITIZE-UNREACHABLE-NEXT: unreachable, !nosanitize
41 // CHECK-SANITIZE: [[CONT]]:
42 // CHECK-SANITIZE-NEXT: call void @llvm.assume(i1 true) [ "align"(i8** %[[X_RETURNED]], i64 128) ]
43 // CHECK-NEXT: ret i8** %[[X_RETURNED]]
44 // CHECK-NEXT: }
45 #line 100
46 return passthrough(x, 128);
47 }
48