signal

bake.cmd

@@ -16,7 +16,7 @@ shift /1
 set CIABATTA_OPTIONS=-Iinc -Wall -g -gcodeview -nodefaultlibs -D_CRT_SECURE_NO_WARNINGS
 set PLATFORM=win
 
-if "%1"=="fast" (
+if "%1"=="test" (
     goto :skip_crt_compilation
 )
 :: For each C file in code/ we check whether it's OS-dependent.

code/assert.c

@@ -20,5 +20,5 @@ extern void _assert_error(
     }
     printf("\tFile: %s\n", file);
     printf("\tLine: %s\n", line);
-    _compiler_brk();
+    abort();
 }

code/os/win/entry.c

@@ -1,4 +1,6 @@
 
+#include <_os.h>
+
 #include <locale.h>
 #include <stdbool.h>
 #include <stdlib.h>
@@ -71,6 +73,7 @@ void mainCRTStartup() {
 
     srand(0);
     setlocale(LC_ALL, "C");
+    _os_init_eh();
     int exit_code = main(arg_count, args);
 
     ExitProcess(exit_code);

code/os/win/env.c

@@ -1,2 +1,10 @@
 
 #include <stdlib.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+void _os_exit(int code)
+{
+    ExitProcess(code);
+}

code/os/win/except.c

@@ -0,0 +1,57 @@
+
+#include <_os.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include<Windows.h>
+
+#include <signal.h>
+#include <stddef.h>
+#include <_macros.h>
+
+typedef struct SignalMapping {
+    DWORD code;
+    int signal;
+} SignalMapping;
+
+static SignalMapping map[] = {
+    {EXCEPTION_ACCESS_VIOLATION,      SIGSEGV},
+    {EXCEPTION_IN_PAGE_ERROR,         SIGSEGV},
+    {EXCEPTION_ARRAY_BOUNDS_EXCEEDED, SIGSEGV},
+    {EXCEPTION_DATATYPE_MISALIGNMENT, SIGALIGN},
+    {EXCEPTION_BREAKPOINT,            SIGBREAK},
+    {EXCEPTION_FLT_DENORMAL_OPERAND,  SIGFPE},
+    {EXCEPTION_FLT_DIVIDE_BY_ZERO,    SIGFPE},
+    {EXCEPTION_FLT_INEXACT_RESULT,    SIGFPE},
+    {EXCEPTION_FLT_INVALID_OPERATION, SIGFPE},
+    {EXCEPTION_FLT_OVERFLOW,          SIGFPE},
+    {EXCEPTION_FLT_STACK_CHECK,       SIGFPE},
+    {EXCEPTION_FLT_UNDERFLOW,         SIGFPE},
+    {EXCEPTION_ILLEGAL_INSTRUCTION,   SIGILL},
+    {EXCEPTION_INT_DIVIDE_BY_ZERO,    SIGFPE},
+    {EXCEPTION_INT_OVERFLOW,          SIGFPE},
+    {EXCEPTION_PRIV_INSTRUCTION,      SIGILL},
+    {EXCEPTION_SINGLE_STEP,           SIGSTEP},
+};
+
+static LONG _win32_handler(EXCEPTION_POINTERS *ExceptionInfo)
+{
+    EXCEPTION_RECORD *exception = ExceptionInfo->ExceptionRecord;
+    DWORD code = exception->ExceptionCode;
+    int signal = -1;
+    for(int mapping = 0; mapping != _countof(map); ++mapping) {
+        if(code == map[mapping].code) {
+            signal = map[mapping].signal;
+        }
+    }
+    if(signal != -1) {
+        raise(signal);
+    }
+    return EXCEPTION_CONTINUE_SEARCH;
+}
+
+void _os_init_eh() {
+    void *res = AddVectoredExceptionHandler(1, &_win32_handler);
+    if(res == NULL) {
+        ExitProcess(-69420);
+    }
+}

code/os/win/io.c

@@ -7,7 +7,7 @@ struct FILE {
     int unused;
 };
 
-void _file_write(void* ctx, size_t n, const char str[]) {
+void _os_file_write(void* ctx, size_t n, const char str[]) {
     DWORD written = 0;
     WriteFile((HANDLE) ctx, str, n, &written, NULL);
 }

code/signal.c

@@ -0,0 +1,46 @@
+
+#include <_os.h>
+#include <signal.h>
+
+void _signal_default_handler(int sig)
+{
+
+}
+
+void _signal_ignore_handler(int sig)
+{
+    // ignore :kekw:
+}
+
+static void (*(handlers[]))(int) = {
+    [SIGINT]   = _signal_ignore_handler,
+    [SIGILL]   = _signal_ignore_handler,
+    [SIGFPE]   = _signal_ignore_handler,
+    [SIGSEGV]  = _signal_ignore_handler,
+    [SIGTERM]  = _signal_ignore_handler,
+    [SIGABRT]  = _signal_ignore_handler,
+    [SIGBREAK] = _signal_ignore_handler,
+    [SIGALIGN] = _signal_ignore_handler,
+    [SIGSTEP]  = _signal_ignore_handler,
+};
+
+void (*signal(int sig, void (*func)(int)))(int)
+{
+    if(_SIG_MIN <= sig && sig <= _SIG_MAX) {
+        handlers[sig] = func;
+        return func;
+    }
+    return SIG_ERR;
+}
+
+int raise(int sig)
+{
+    if(_SIG_MIN <= sig && sig <= _SIG_MAX) {
+        handlers[sig](sig);
+        if(sig == SIGFPE || sig == SIGILL || sig == SIGSEGV) {
+            _os_exit(-69420);
+        }
+        return 1;
+    }
+    return 0;
+}

code/stdio.c

@@ -40,12 +40,12 @@ static void string_write(void *ctx, size_t n, const char *restrict str) {
 }
 
 int fprintf(FILE *file, const char *restrict fmt, ...) {
-	CALL_PRINTF(fmt_print_char, file, _file_write, fmt);
+	CALL_PRINTF(fmt_print_char, file, _os_file_write, fmt);
 	return result;
 }
 
 int printf(const char *restrict fmt, ...) {
-    CALL_PRINTF(fmt_print_char, stdout, _file_write, fmt);
+    CALL_PRINTF(fmt_print_char, stdout, _os_file_write, fmt);
 	return result;
 }
 
@@ -62,11 +62,11 @@ int sprintf(char *restrict s, const char *restrict fmt, ...) {
 }
 
 int vfprintf(FILE *file, const char *restrict fmt, va_list args) {
-	return fmt_print_char(file, _file_write, fmt, args);
+	return fmt_print_char(file, _os_file_write, fmt, args);
 }
 
 int vprintf(const char *restrict fmt, va_list args) {
-	return fmt_print_char(stdout, _file_write, fmt, args);
+	return fmt_print_char(stdout, _os_file_write, fmt, args);
 }
 
 int vsnprintf(char *restrict s, size_t n, const char *restrict fmt, va_list args) {

inc/_macros.h

@@ -6,3 +6,4 @@
 
 #define _con(a,b) a ## b
 
+#define _countof(arr) (sizeof (arr) / sizeof ((arr)[0]))

inc/_os.h

@@ -15,5 +15,7 @@
 #endif
 
 // OS-dependent IO Functions
-void _file_write(void* ctx, size_t n, const char str[]);
+void _os_file_write(void* ctx, size_t n, const char str[]);
+void _os_exit(int code);
+void _os_init_eh();
 typedef struct FILE FILE;

inc/assert.h

@@ -1,5 +1,6 @@
 #pragma once
 #include "_compiler.h"
+#include "_macros.h"
 
 extern void _assert_error(
     char *cond,

inc/signal.h

@@ -3,19 +3,24 @@
 
 typedef int sig_atomic_t;
 
-// TODO: implement this
+// TODO: idk about SIG_ERR, for now this
-#define SIG_DFL 0
+#define SIG_ERR ((void(*)(int))0)
-#define SIG_ERR 1
+#define SIG_DFL _signal_default_handler
-#define SIG_IGN 2
+#define SIG_IGN _signal_ignore_handler
 
-// not sure why but windows picked these, we can change it later
+// Note(bumbread): from the impl standpoint the numbers are arbitrary
-#define SIGINT          2
+#define _SIG_MIN 0
-#define SIGILL          4
+#define SIGINT   1
-#define SIGFPE          8
+#define SIGILL   2
-#define SIGSEGV         11
+#define SIGFPE   3
-#define SIGTERM         15
+#define SIGSEGV  4
-#define SIGBREAK        21
+#define SIGTERM  5
-#define SIGABRT         22
+#define SIGABRT  6
+// These guys are impl defined
+#define SIGBREAK 7
+#define SIGALIGN 8
+#define SIGSTEP  9
+#define _SIG_MAX 9
 
 void (*signal(int sig, void (*func)(int)))(int);
 int raise(int sig);

test/test.c

@@ -4,10 +4,21 @@
 #include <stdlib.h>
 #include <errno.h>
 
+#include <stdbool.h>
 #include <inttypes.h>
 
+#include <signal.h>
+
+void my_va_handler(int a) {
+    printf("NULLPTR deref or something idk not an expert in signals\n");
+}
+
 int main(int argc, char** argv) {
-    uint64_t mynumber = 4;
+    signal(SIGSEGV, my_va_handler);
-    printf("Hello, guys %"PRIu64"\n", mynumber);
+    signal(SIGFPE,  my_va_handler);
+
+    int a = INT_MAX;
+    a /= 0;
+
     return 0;
 }