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[Clang] Adjust exit() builtin impl #101689

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[Clang] Adjust exit() builtin impl #101689

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6 changes: 4 additions & 2 deletions clang/include/clang/Basic/Builtins.td
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Original file line number Diff line number Diff line change
Expand Up @@ -2660,9 +2660,10 @@ def Calloc : LibBuiltin<"stdlib.h"> {
}

def Exit : LibBuiltin<"stdlib.h"> {
let Spellings = ["exit", "_Exit"];
let Spellings = ["exit"];
let Attributes = [NoReturn];
let Prototype = "void(int)";
let AddBuiltinPrefixedAlias = 1;
}

def Malloc : LibBuiltin<"stdlib.h"> {
Expand Down Expand Up @@ -3266,9 +3267,10 @@ def StrnCaseCmp : GNULibBuiltin<"strings.h"> {
}

def GNU_Exit : GNULibBuiltin<"unistd.h"> {
let Spellings = ["_exit"];
let Spellings = ["_exit", "_Exit"];
let Attributes = [NoReturn];
let Prototype = "void(int)";
let AddBuiltinPrefixedAlias = 1;
}

def VFork : LibBuiltin<"unistd.h"> {
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21 changes: 21 additions & 0 deletions clang/test/CodeGen/attributes.c
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Expand Up @@ -113,6 +113,27 @@ void t24(f_t f1) {
(*p)();
}

// CHECK:define{{.*}} void @t25() [[NUW]] {
// CHECK: call void @exit(i32 noundef 1)
// CHECK-NEXT: unreachable
void t25(void) {
__builtin_exit(1);
}

// CHECK:define{{.*}} void @t26() [[NUW]] {
// CHECK: call void @_exit(i32 noundef 2)
// CHECK-NEXT: unreachable
void t26(void) {
__builtin__exit(2);
}

// CHECK:define{{.*}} void @t27() [[NUW]] {
// CHECK: call void @_Exit(i32 noundef 3)
// CHECK-NEXT: unreachable
void t27(void) {
__builtin__Exit(3);
}

// CHECK: attributes [[NUW]] = { noinline nounwind{{.*}} }
// CHECK: attributes [[NR]] = { noinline noreturn nounwind{{.*}} }
// CHECK: attributes [[COLDDEF]] = { cold {{.*}}}
Expand Down