Add hlc stack trace to Linux/Mac (#634)

src/hlc_main.c

@@ -55,6 +55,10 @@ extern void sys_global_exit();
 #	define _CrtCheckMemory()
 #endif
 
+#if defined(HL_LINUX) || defined(HL_MAC)
+#	include <execinfo.h>
+#endif
+
 static uchar *hlc_resolve_symbol( void *addr, uchar *out, int *outSize ) {
 #ifdef HL_WIN_DESKTOP
 	static HANDLE stack_process_handle = NULL;
@@ -80,6 +84,18 @@ static uchar *hlc_resolve_symbol( void *addr, uchar *out, int *outSize ) {
 		*outSize = usprintf(out,*outSize,USTR("%s(%s:%d)"),data.sym.Name,wcsrchr(line.FileName,'\\')+1,(int)line.LineNumber);
 		return out;
 	}
+#elif defined(HL_LINUX) || defined(HL_MAC)
+	void *array[1];
+	char **strings;
+	array[0] = addr;
+	strings = backtrace_symbols(array, 1);
+	if (strings != NULL) {
+		*outSize = (int)strlen(strings[0]) << 1;
+		out = (uchar*)hl_gc_alloc_noptr(*outSize);
+		hl_from_utf8(out,*outSize,strings[0]);
+		free(strings);
+		return out;
+	}
 #endif
 	return NULL;
 }
@@ -88,8 +104,12 @@ static int hlc_capture_stack( void **stack, int size ) {
 	int count = 0;
 #	ifdef HL_WIN_DESKTOP
 	count = CaptureStackBackTrace(2, size, stack, NULL) - 8; // 8 startup
-	if( count < 0 ) count = 0;
+#	elif defined(HL_LINUX)
+	count = backtrace(stack, size) - 8;
+#	elif defined(HL_MAC)
+	count = backtrace(stack, size) - 6;
 #	endif
+	if( count < 0 ) count = 0;
 	return count;
 }