tests/checkasm: Simplify logic for WASI signal handling

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
Reviewed-by: Martin Storsjö <martin@martin.st>

tests/checkasm/checkasm.c

@@ -771,9 +771,7 @@ static LONG NTAPI signal_handler(EXCEPTION_POINTERS *e) {
     return EXCEPTION_CONTINUE_EXECUTION; /* never reached, but shuts up gcc */
 }
 #endif
-#else
-
-#ifndef _WASI_EMULATED_SIGNAL
+#elif !defined(_WASI_EMULATED_SIGNAL)
 static void signal_handler(int s);
 
 static const struct sigaction signal_handler_act = {
@@ -788,8 +786,6 @@ static void signal_handler(int s) {
         checkasm_load_context(s);
     }
 }
-#endif // _WASI_EMULATED_SIGNAL
-
 #endif
 
 /* Compares a string with a wildcard pattern. */
@@ -938,13 +934,11 @@ int main(int argc, char *argv[])
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
     AddVectoredExceptionHandler(0, signal_handler);
 #endif
-#else
-#ifndef _WASI_EMULATED_SIGNAL
+#elif !defined(_WASI_EMULATED_SIGNAL)
     sigaction(SIGBUS,  &signal_handler_act, NULL);
     sigaction(SIGFPE,  &signal_handler_act, NULL);
     sigaction(SIGILL,  &signal_handler_act, NULL);
     sigaction(SIGSEGV, &signal_handler_act, NULL);
-#endif // _WASI_EMULATED_SIGNAL
 #endif
 #if HAVE_PRCTL && defined(PR_SET_UNALIGN)
     prctl(PR_SET_UNALIGN, PR_UNALIGN_SIGBUS);

tests/checkasm/checkasm.h

@@ -66,23 +66,16 @@ typedef struct { CONTEXT c; int status; } checkasm_context;
 #define checkasm_save_context() 0
 #define checkasm_load_context() do {} while (0)
 #endif
-#else  // _WIN32
-
-#ifdef _WASI_EMULATED_SIGNAL
-
+#elif defined(_WASI_EMULATED_SIGNAL)
 #define checkasm_context void*
 #define checkasm_save_context() 0
 #define checkasm_load_context() do {} while (0)
-
-#else  // _WASI_EMULATED_SIGNAL
-
+#else
 #include <setjmp.h>
 typedef sigjmp_buf checkasm_context;
 #define checkasm_save_context() checkasm_handle_signal(sigsetjmp(checkasm_context_buf, 1))
 #define checkasm_load_context(s) siglongjmp(checkasm_context_buf, s)
-#endif  // _WASI_EMULATED_SIGNAL
-
-#endif  // _WIN32
+#endif
 
 void checkasm_check_aacencdsp(void);
 void checkasm_check_aacpsdsp(void);