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llvm-project/clang/test/CodeGen/setjmp.c

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Recognize setjmp and friends as builtins even if jmp_buf is not declared yet. This happens in glibc's headers. It's important that we recognize these functions so that we can mark them as returns_twice. Differential Revision: https://reviews.llvm.org/D88518
2020-09-30 06:20:11 +08:00
// RUN: %clang_cc1 -x c %s -triple x86_64-linux-gnu -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 -x c++ %s -triple x86_64-linux-gnu -emit-llvm -o - | FileCheck %s
#ifdef __cplusplus
extern "C" {
#endif
struct __jmp_buf_tag { int n; };
int setjmp(struct __jmp_buf_tag*);
int sigsetjmp(struct __jmp_buf_tag*, int);
int _setjmp(struct __jmp_buf_tag*);
int __sigsetjmp(struct __jmp_buf_tag*, int);
typedef struct __jmp_buf_tag jmp_buf[1];
typedef struct __jmp_buf_tag sigjmp_buf[1];
#ifdef __cplusplus
}
#endif
Use functions with prototypes when appropriate; NFC A significant number of our tests in C accidentally use functions without prototypes. This patch converts the function signatures to have a prototype for the situations where the test is not specific to K&R C declarations. e.g., void func(); becomes void func(void); This is the eleventh batch of tests being updated (there are a significant number of other tests left to be updated).
2022-02-16 05:06:01 +08:00
void f(void) {
Recognize setjmp and friends as builtins even if jmp_buf is not declared yet. This happens in glibc's headers. It's important that we recognize these functions so that we can mark them as returns_twice. Differential Revision: https://reviews.llvm.org/D88518
2020-09-30 06:20:11 +08:00
jmp_buf jb;
// CHECK: call {{.*}}@setjmp(
setjmp(jb);
// CHECK: call {{.*}}@sigsetjmp(
sigsetjmp(jb, 0);
// CHECK: call {{.*}}@_setjmp(
_setjmp(jb);
// CHECK: call {{.*}}@__sigsetjmp(
__sigsetjmp(jb, 0);
}
// CHECK: ; Function Attrs: returns_twice
// CHECK-NEXT: declare {{.*}} @setjmp(
// CHECK: ; Function Attrs: returns_twice
// CHECK-NEXT: declare {{.*}} @sigsetjmp(
// CHECK: ; Function Attrs: returns_twice
// CHECK-NEXT: declare {{.*}} @_setjmp(
// CHECK: ; Function Attrs: returns_twice
// CHECK-NEXT: declare {{.*}} @__sigsetjmp(