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/*
* Main entry point of the bootstrap compiler.
*
* Copyright © 2025 Samuel Lidén Borell <samuel@kodafritt.se>
*
* SPDX-License-Identifier: EUPL-1.2+ OR LGPL-2.1-or-later
*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "compiler.h"
#include "token.h"
#if defined(_WIN32) || defined(_WIN64)
#define DIRSEP '\\'
#else
#define DIRSEP '/'
#endif
#define PATH_LIMIT 512
static size_t ifacedir_len = 0;
static const char *ifacedir = NULL;
static size_t rootdir_len = 0;
static const char *rootdir;
static FILE *f = NULL;
static const char *output_filename = NULL;
const char *current_filename = NULL;
static char *last_alloced_filename = NULL;
unsigned current_line = 0;
NORETURN void error(const char *s)
{
error_len(s, NULL, 0);
}
NORETURN void error_str(const char *s, const char *arg)
{
error_len(s, arg, arg ? strlen(arg) : 0);
}
NORETURN void error_len(const char *s, const char *arg, size_t arglen)
{
assert(arglen <= INT_MAX);
fprintf(stderr, "%s:%u: %s%s%.*s\n", current_filename, current_line,
s,
arg ? ": " : "",
(int)arglen, arg);
if (output_filename) {
remove(output_filename);
}
exit(EXIT_FAILURE);
}
NORETURN void error_token(const char *s, const struct LexemeInfo *li)
{
error_len(s, li->string, li->len);
}
NORETURN void error_ident(const char *s, const struct Ident *ident)
{
error_len(s, ident->node.name, ident->node.length);
}
NORETURN void error_var(const char *s, const struct Var *var)
{
error_ident(s, &var->ident);
}
void warning(const char *s)
{
fprintf(stderr, "%s:%u: warning: %s\n",
current_filename, current_line, s);
}
static void open_file(const char *dir, size_t dirlen, const char *filename)
{
size_t filename_len, total_len;
char *fullpath;
filename_len = strlen(filename);
total_len = dirlen + 1 + filename_len + 1;
if (total_len > PATH_LIMIT) {
FAIL("filename too long");
}
fullpath = malloc(total_len);
NO_NULL(fullpath);
/* Root dir */
memcpy(fullpath, dir, dirlen);
fullpath[dirlen] = DIRSEP;
/* Source file */
memcpy(fullpath+dirlen+1, filename, filename_len);
replacechar(fullpath+dirlen+1, '/', DIRSEP, filename_len);
fullpath[dirlen+1+filename_len] = '\0';
f = fopen(fullpath, "rb");
if (!f) {
perror(fullpath);
exit(EXIT_FAILURE);
}
last_alloced_filename = fullpath;
current_filename = fullpath;
current_line = 0;
}
static void close_file(void)
{
assert(f != NULL);
NO_NEG(fclose(f));
f = NULL;
current_filename = NULL;
current_line = 0;
}
static void parse_core_interface(void)
{
/* TODO rename core_wip.slul to core.slul once it's API-stable */
open_file(ifacedir, ifacedir_len, "core_wip.slul");
/* TODO forbid Uppercase initial letter in interfaces?
or at least don't create an implicit class. */
parse_file(f, "core_wip.slul");
builtins_bind();
close_file();
}
static void parse(void)
{
unsigned i;
module_start();
/* TODO Decide on a file name here. In particular,
check that "sources.index" is not used for anything else. */
open_file(rootdir, rootdir_len, "sources.index");
parse_source_index(f);
close_file();
free(last_alloced_filename);
parse_core_interface();
interfaces_done = true;
for (i = 0; i < num_sources; i++) {
open_file(rootdir, rootdir_len, sources[i]);
parse_file(f, path_basename(sources[i]));
close_file();
}
num_sources = 0;
interfaces_done = false;
}
static void set_rootdir(const char *rootdir_arg)
{
rootdir_len = strlen(rootdir_arg);
if (rootdir_len+2 >= PATH_LIMIT) FAIL("source path too long");
rootdir = rootdir_arg;
}
static void reset_sources_index(void)
{
num_sources = 0;
}
int main(int argc, char **argv)
{
enum {
IFACEDIR_ARG = 1,
C_OUTPUT_ARG = 2,
SOURCE_DIR_ARG = 3
};
int i;
if (argc < 3) {
fprintf(stderr, "usage: "
"stage1 <interface-dir> <_gen.c-file> <source-dir>...\n");
return EXIT_FAILURE;
}
ifacedir = argv[IFACEDIR_ARG];
ifacedir_len = strlen(ifacedir);
/* Parse each module. This is a hack, that just throws everything
together in a single namespace (which is incorrect, but works
for compiling the SLUL compiler). */
modules = NULL;
for (i = SOURCE_DIR_ARG; i < argc; i++) {
set_rootdir(argv[i]);
parse();
reset_sources_index();
}
/* TODO should the bootstrap compiler support interfaces?
- that way, the interface/module can be tested early
- that way, the backend and common functions can be
separate modules, that can be re-used.
*/
/* TODO should each file be parsed in a separate namespace?
- that way, each file can have different dependencies.
- that way, each file can have local functions.
*/
output_filename = argv[C_OUTPUT_ARG];
emit_c_code(output_filename);
return EXIT_SUCCESS;
}
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