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#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <string.h>
#include <unistd.h> // getopt
#include <assert.h>
#define DEFUALT_PATH "./bin"
#define DEFUALT_TYPE "lalr-table"
#define DEFAULT_OUTPUT "bin/a"
#include "parts/symbol.h"
size_t total_symbols;
int (*symbol_is_terminal)(symbol s);
int (*symbol_is_input_end)(symbol s);
int (*symbol_is_valid)(symbol s);
#include "parts/grammar.h"
struct production *grammar;
size_t total_productions;
char **semantic_action_str;
#include "parts/table.h"
struct action **table;
size_t table_states;
int (*table_fill)();
void (*table_free)();
#include "util-tables.c"
void *xdlsym(void *handle, char *sym)
{
void *r = dlsym(handle, sym);
if(!r) {
fprintf(stderr, "ERROR: Symbol '%s' was not found\n", sym);
dlclose(handle);
exit(1);
}
return r;
}
#define GET_VARIABLE(var, handle) \
var = *(typeof(&var))xdlsym(handle, #var)
char *modpath(char *name)
{
static char fullpath[128];
// TODO: search the GENERATE_PARSER_PATH env var
char *path = DEFUALT_PATH;
assert(snprintf(fullpath, 128, "%s/%s.so", path, name) < 128);
return fullpath;
}
char *add_extension(char *str, char *ext)
{
static char full[128];
assert((strlen(str) + strlen(ext) + 1) <= 128);
memcpy(full, str, strlen(str)+1);
return strcat(full, ext);
}
void set_stdout(char *filename)
{
if(!filename) filename = "/dev/tty";
assert(freopen(filename, "a+", stdout));
}
int main(int argc, char **argv)
{
char *type = DEFUALT_TYPE;
char *output_path = DEFAULT_OUTPUT;
int opt;
while((opt = getopt(argc, argv, "t:o:")) != -1) {
switch(opt) {
case 't': type = optarg; break;
case 'o': output_path = optarg; break;
default: fprintf(stderr, "ERROR: Unknown options '%c'\n", optopt);
return 1;
}
}
if(optind == argc) {
fprintf(stderr, "ERROR: No input file\n");
return 1;
}
void *table_handle = dlopen(modpath(type), RTLD_LAZY);
if(!table_handle) { fputs(dlerror(), stderr); return 1; }
void *def_handle = dlopen(argv[optind], RTLD_LAZY);
if(!def_handle) { fputs(dlerror(), stderr); return 1; }
GET_VARIABLE(table, table_handle);
GET_VARIABLE(table_states, table_handle);
GET_VARIABLE(table_fill, table_handle);
GET_VARIABLE(table_free, table_handle);
GET_VARIABLE(total_symbols, def_handle);
GET_VARIABLE(symbol_is_terminal, def_handle);
GET_VARIABLE(symbol_is_input_end, def_handle);
GET_VARIABLE(symbol_is_valid, def_handle);
GET_VARIABLE(grammar, def_handle);
GET_VARIABLE(total_productions, def_handle);
GET_VARIABLE(semantic_action_str, def_handle);
util_tables_fill();
int r = 0;
if((r = table_fill())) {
fprintf(stderr, "ERROR: Table couldn't be generated\n");
goto cleanup;
}
set_stdout(add_extension(output_path, ".c"));
printf("size_t total_symbols = %zu;\n", total_symbols);
printf("IMPLEMENT_FUNCPTR(int, symbol_is_valid, (symbol s)) {return s < total_symbols;}\n");
printf("struct production _grammar[] = {\n");
grammar_print_cstyle();
printf("};\n");
printf("struct production *grammar = _grammar;");
printf("size_t total_productions = %zu;\n", total_productions);
printf("struct action **table = (struct action *([])){\n");
table_print_cstyle();
printf("};\n");
printf("size_t table_states = %zu;\n", table_states);
for(size_t i = 0; i < total_productions; i++) {
printf("#define A(n) (*(stack_head-3*%zu+3*n-1))\n", grammar[i].nRHS-1);
printf("int __prod%zu_action(int *stack_head)\n", i);
printf("{ int v;\n");
printf(semantic_action_str[i]);
printf("return v; }\n");
printf("#undef A\n");
}
printf("typedef int (*semantic_action_fn)(int *stack_head);\n");
printf("semantic_action_fn *semantic_actions = (semantic_action_fn[]){\n");
for(size_t i = 0; i < total_productions; i++)
printf("__prod%zu_action, ", i);
printf("};");
set_stdout(NULL);
cleanup:
table_free();
util_tables_free();
dlclose(table_handle);
dlclose(def_handle);
return r;
}
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