mirror of
https://github.com/DarkPlacesEngine/gmqcc.git
synced 2024-11-24 04:41:25 +00:00
717 lines
20 KiB
C
717 lines
20 KiB
C
/*
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* Copyright (C) 2012
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* Wolfgang Bumiller
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "gmqcc.h"
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#include "lexer.h"
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typedef struct {
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bool on;
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bool was_on;
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bool had_else;
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} ppcondition;
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typedef struct {
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int token;
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char *value;
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/* a copy from the lexer */
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union {
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vector v;
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int i;
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double f;
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int t; /* type */
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} constval;
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} pptoken;
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typedef struct {
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lex_ctx ctx;
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char *name;
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char **params;
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/* yes we need an extra flag since `#define FOO x` is not the same as `#define FOO() x` */
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bool has_params;
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pptoken **output;
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} ppmacro;
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typedef struct {
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lex_file *lex;
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int token;
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bool newline;
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unsigned int errors;
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ppcondition *conditions;
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ppmacro **macros;
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} ftepp_t;
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#define ftepp_tokval(f) ((f)->lex->tok.value)
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#define ftepp_ctx(f) ((f)->lex->tok.ctx)
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static void ftepp_errorat(ftepp_t *ftepp, lex_ctx ctx, const char *fmt, ...)
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{
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va_list ap;
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ftepp->errors++;
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va_start(ap, fmt);
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con_vprintmsg(LVL_ERROR, ctx.file, ctx.line, "error", fmt, ap);
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va_end(ap);
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}
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static void ftepp_error(ftepp_t *ftepp, const char *fmt, ...)
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{
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va_list ap;
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ftepp->errors++;
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va_start(ap, fmt);
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con_vprintmsg(LVL_ERROR, ftepp->lex->tok.ctx.file, ftepp->lex->tok.ctx.line, "error", fmt, ap);
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va_end(ap);
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}
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pptoken *pptoken_make(ftepp_t *ftepp)
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{
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pptoken *token = (pptoken*)mem_a(sizeof(pptoken));
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token->token = ftepp->token;
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if (token->token == TOKEN_WHITE)
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token->value = util_strdup(" ");
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else
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token->value = util_strdup(ftepp_tokval(ftepp));
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memcpy(&token->constval, &ftepp->lex->tok.constval, sizeof(token->constval));
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return token;
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}
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void pptoken_delete(pptoken *self)
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{
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mem_d(self->value);
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mem_d(self);
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}
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ppmacro *ppmacro_new(lex_ctx ctx, const char *name)
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{
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ppmacro *macro = (ppmacro*)mem_a(sizeof(ppmacro));
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memset(macro, 0, sizeof(*macro));
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macro->name = util_strdup(name);
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return macro;
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}
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void ppmacro_delete(ppmacro *self)
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{
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size_t i;
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for (i = 0; i < vec_size(self->params); ++i)
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mem_d(self->params[i]);
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vec_free(self->params);
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for (i = 0; i < vec_size(self->output); ++i)
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pptoken_delete(self->output[i]);
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vec_free(self->output);
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mem_d(self->name);
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mem_d(self);
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}
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ftepp_t* ftepp_init()
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{
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ftepp_t *ftepp;
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ftepp = (ftepp_t*)mem_a(sizeof(*ftepp));
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memset(ftepp, 0, sizeof(*ftepp));
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return ftepp;
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}
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void ftepp_delete(ftepp_t *self)
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{
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size_t i;
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for (i = 0; i < vec_size(self->macros); ++i)
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ppmacro_delete(self->macros[i]);
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vec_free(self->macros);
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vec_free(self->conditions);
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lex_close(self->lex);
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mem_d(self);
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}
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static void ftepp_out(ftepp_t *ftepp, const char *str, bool ignore_cond)
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{
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if (ignore_cond ||
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!vec_size(ftepp->conditions) ||
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vec_last(ftepp->conditions).on)
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{
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printf("%s", str);
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}
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}
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ppmacro* ftepp_macro_find(ftepp_t *ftepp, const char *name)
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{
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size_t i;
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for (i = 0; i < vec_size(ftepp->macros); ++i) {
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if (!strcmp(name, ftepp->macros[i]->name))
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return ftepp->macros[i];
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}
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return NULL;
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}
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static inline int ftepp_next(ftepp_t *ftepp)
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{
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return (ftepp->token = lex_do(ftepp->lex));
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}
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/* Important: this does not skip newlines! */
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static bool ftepp_skipspace(ftepp_t *ftepp)
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{
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if (ftepp->token != TOKEN_WHITE)
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return true;
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while (ftepp_next(ftepp) == TOKEN_WHITE) {}
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if (ftepp->token >= TOKEN_EOF) {
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ftepp_error(ftepp, "unexpected end of preprocessor directive");
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return false;
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}
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return true;
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}
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/* this one skips EOLs as well */
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static bool ftepp_skipallwhite(ftepp_t *ftepp)
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{
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if (ftepp->token != TOKEN_WHITE && ftepp->token != TOKEN_EOL)
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return true;
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do {
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ftepp_next(ftepp);
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} while (ftepp->token == TOKEN_WHITE || ftepp->token == TOKEN_EOL);
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if (ftepp->token >= TOKEN_EOF) {
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ftepp_error(ftepp, "unexpected end of preprocessor directive");
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return false;
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}
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return true;
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}
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/**
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* The huge macro parsing code...
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*/
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static bool ftepp_define_params(ftepp_t *ftepp, ppmacro *macro)
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{
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do {
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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if (ftepp->token == ')')
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break;
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switch (ftepp->token) {
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case TOKEN_IDENT:
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case TOKEN_TYPENAME:
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case TOKEN_KEYWORD:
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break;
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default:
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ftepp_error(ftepp, "unexpected token in parameter list");
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return false;
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}
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vec_push(macro->params, util_strdup(ftepp_tokval(ftepp)));
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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} while (ftepp->token == ',');
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if (ftepp->token != ')') {
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ftepp_error(ftepp, "expected closing paren after macro parameter list");
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return false;
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}
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ftepp_next(ftepp);
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/* skipspace happens in ftepp_define */
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return true;
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}
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static bool ftepp_define_body(ftepp_t *ftepp, ppmacro *macro)
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{
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pptoken *ptok;
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while (ftepp->token != TOKEN_EOL && ftepp->token < TOKEN_EOF) {
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ptok = pptoken_make(ftepp);
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vec_push(macro->output, ptok);
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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}
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if (ftepp->token != TOKEN_EOL) {
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ftepp_error(ftepp, "unexpected junk after macro or unexpected end of file");
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return false;
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}
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return true;
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}
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static bool ftepp_define(ftepp_t *ftepp)
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{
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ppmacro *macro;
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(void)ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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switch (ftepp->token) {
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case TOKEN_IDENT:
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case TOKEN_TYPENAME:
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case TOKEN_KEYWORD:
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macro = ppmacro_new(ftepp_ctx(ftepp), ftepp_tokval(ftepp));
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break;
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default:
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ftepp_error(ftepp, "expected macro name");
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return false;
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}
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(void)ftepp_next(ftepp);
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if (ftepp->token == '(') {
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macro->has_params = true;
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if (!ftepp_define_params(ftepp, macro))
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return false;
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}
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if (!ftepp_skipspace(ftepp))
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return false;
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if (!ftepp_define_body(ftepp, macro))
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return false;
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vec_push(ftepp->macros, macro);
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return true;
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}
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static bool ftepp_macro_call(ftepp_t *ftepp, ppmacro *macro)
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{
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size_t o;
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ftepp_next(ftepp);
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if (!macro->has_params) {
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for (o = 0; o < vec_size(macro->output); ++o) {
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ftepp_out(ftepp, macro->output[o]->value, false);
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}
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return true;
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}
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if (!ftepp_skipallwhite(ftepp))
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return false;
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return true;
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}
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/**
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* When a macro is used we have to handle parameters as well
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* as special-concatenation via ## or stringification via #
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*/
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/**
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* #if - the FTEQCC way:
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* defined(FOO) => true if FOO was #defined regardless of parameters or contents
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* <numbers> => True if the number is not 0
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* !<factor> => True if the factor yields false
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* !!<factor> => ERROR on 2 or more unary nots
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* <macro> => becomes the macro's FIRST token regardless of parameters
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* <e> && <e> => True if both expressions are true
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* <e> || <e> => True if either expression is true
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* <string> => False
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* <ident> => False (remember for macros the <macro> rule applies instead)
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* Unary + and - are weird and wrong in fteqcc so we don't allow them
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* parenthesis in expressions are allowed
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* parameter lists on macros are errors
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* No mathematical calculations are executed
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*/
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static bool ftepp_if_expr(ftepp_t *ftepp, bool *out)
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{
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ppmacro *macro;
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bool wasnot = false;
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if (!ftepp_skipspace(ftepp))
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return false;
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while (ftepp->token == '!') {
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wasnot = true;
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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}
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switch (ftepp->token) {
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case TOKEN_IDENT:
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case TOKEN_TYPENAME:
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case TOKEN_KEYWORD:
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if (!strcmp(ftepp_tokval(ftepp), "defined")) {
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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if (ftepp->token != '(') {
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ftepp_error(ftepp, "`defined` keyword in #if requires a macro name in parenthesis");
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return false;
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}
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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if (ftepp->token != TOKEN_IDENT &&
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ftepp->token != TOKEN_TYPENAME &&
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ftepp->token != TOKEN_KEYWORD)
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{
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ftepp_error(ftepp, "defined() used on an unexpected token type");
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return false;
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}
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macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
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*out = !!macro;
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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if (ftepp->token != ')') {
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ftepp_error(ftepp, "expected closing paren");
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return false;
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}
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break;
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}
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macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
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if (!macro || !vec_size(macro->output)) {
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*out = false;
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} else {
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/* This does not expand recursively! */
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switch (macro->output[0]->token) {
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case TOKEN_INTCONST:
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*out = !!(macro->output[0]->constval.f);
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break;
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case TOKEN_FLOATCONST:
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*out = !!(macro->output[0]->constval.f);
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break;
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default:
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*out = false;
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break;
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}
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}
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break;
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case TOKEN_STRINGCONST:
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*out = false;
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break;
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case TOKEN_INTCONST:
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*out = !!(ftepp->lex->tok.constval.i);
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break;
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case TOKEN_FLOATCONST:
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*out = !!(ftepp->lex->tok.constval.f);
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break;
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case '(':
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ftepp_next(ftepp);
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if (!ftepp_if_expr(ftepp, out))
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return false;
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if (ftepp->token != ')') {
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ftepp_error(ftepp, "expected closing paren in #if expression");
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return false;
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}
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break;
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default:
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ftepp_error(ftepp, "junk in #if");
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return false;
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}
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if (wasnot)
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*out = !*out;
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ftepp->lex->flags.noops = false;
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ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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ftepp->lex->flags.noops = true;
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if (ftepp->token == ')')
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return true;
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if (ftepp->token != TOKEN_OPERATOR)
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return true;
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if (!strcmp(ftepp_tokval(ftepp), "&&") ||
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!strcmp(ftepp_tokval(ftepp), "||"))
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{
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bool next = false;
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char opc = ftepp_tokval(ftepp)[0];
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ftepp_next(ftepp);
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if (!ftepp_if_expr(ftepp, &next))
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return false;
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if (opc == '&')
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*out = *out && next;
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else
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*out = *out || next;
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return true;
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}
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else {
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ftepp_error(ftepp, "junk after #if");
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return false;
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}
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}
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static bool ftepp_if(ftepp_t *ftepp, ppcondition *cond)
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{
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bool result = false;
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memset(cond, 0, sizeof(*cond));
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(void)ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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if (ftepp->token == TOKEN_EOL) {
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ftepp_error(ftepp, "expected expression for #if-directive");
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return false;
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}
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if (!ftepp_if_expr(ftepp, &result))
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return false;
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cond->on = result;
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return true;
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}
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/**
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* ifdef is rather simple
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*/
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static bool ftepp_ifdef(ftepp_t *ftepp, ppcondition *cond)
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{
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ppmacro *macro;
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memset(cond, 0, sizeof(*cond));
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(void)ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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switch (ftepp->token) {
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case TOKEN_IDENT:
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case TOKEN_TYPENAME:
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case TOKEN_KEYWORD:
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macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
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break;
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default:
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ftepp_error(ftepp, "expected macro name");
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return false;
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}
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(void)ftepp_next(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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if (ftepp->token != TOKEN_EOL) {
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ftepp_error(ftepp, "stray tokens after #ifdef");
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return false;
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}
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cond->on = !!macro;
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return true;
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}
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/* Basic structure handlers */
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static bool ftepp_else_allowed(ftepp_t *ftepp)
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{
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if (!vec_size(ftepp->conditions)) {
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ftepp_error(ftepp, "#else without #if");
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return false;
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}
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if (vec_last(ftepp->conditions).had_else) {
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ftepp_error(ftepp, "multiple #else for a single #if");
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return false;
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}
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return true;
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}
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static bool ftepp_hash(ftepp_t *ftepp)
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{
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ppcondition cond;
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ppcondition *pc;
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lex_ctx ctx = ftepp_ctx(ftepp);
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if (!ftepp_skipspace(ftepp))
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return false;
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switch (ftepp->token) {
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case TOKEN_KEYWORD:
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case TOKEN_IDENT:
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case TOKEN_TYPENAME:
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if (!strcmp(ftepp_tokval(ftepp), "define")) {
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return ftepp_define(ftepp);
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}
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else if (!strcmp(ftepp_tokval(ftepp), "ifdef")) {
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if (!ftepp_ifdef(ftepp, &cond))
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return false;
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cond.was_on = cond.on;
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vec_push(ftepp->conditions, cond);
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break;
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}
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else if (!strcmp(ftepp_tokval(ftepp), "ifndef")) {
|
|
if (!ftepp_ifdef(ftepp, &cond))
|
|
return false;
|
|
cond.on = !cond.on;
|
|
cond.was_on = cond.on;
|
|
vec_push(ftepp->conditions, cond);
|
|
break;
|
|
}
|
|
else if (!strcmp(ftepp_tokval(ftepp), "elifdef")) {
|
|
if (!ftepp_else_allowed(ftepp))
|
|
return false;
|
|
if (!ftepp_ifdef(ftepp, &cond))
|
|
return false;
|
|
pc = &vec_last(ftepp->conditions);
|
|
pc->on = !pc->was_on && cond.on;
|
|
pc->was_on = pc->was_on || pc->on;
|
|
break;
|
|
}
|
|
else if (!strcmp(ftepp_tokval(ftepp), "elifndef")) {
|
|
if (!ftepp_else_allowed(ftepp))
|
|
return false;
|
|
if (!ftepp_ifdef(ftepp, &cond))
|
|
return false;
|
|
cond.on = !cond.on;
|
|
pc = &vec_last(ftepp->conditions);
|
|
pc->on = !pc->was_on && cond.on;
|
|
pc->was_on = pc->was_on || pc->on;
|
|
break;
|
|
}
|
|
else if (!strcmp(ftepp_tokval(ftepp), "elif")) {
|
|
if (!ftepp_else_allowed(ftepp))
|
|
return false;
|
|
if (!ftepp_if(ftepp, &cond))
|
|
return false;
|
|
pc = &vec_last(ftepp->conditions);
|
|
pc->on = !pc->was_on && cond.on;
|
|
pc->was_on = pc->was_on || pc->on;
|
|
break;
|
|
}
|
|
else if (!strcmp(ftepp_tokval(ftepp), "if")) {
|
|
if (!ftepp_if(ftepp, &cond))
|
|
return false;
|
|
cond.was_on = cond.on;
|
|
vec_push(ftepp->conditions, cond);
|
|
break;
|
|
}
|
|
else if (!strcmp(ftepp_tokval(ftepp), "else")) {
|
|
if (!ftepp_else_allowed(ftepp))
|
|
return false;
|
|
pc = &vec_last(ftepp->conditions);
|
|
pc->on = !pc->was_on;
|
|
pc->had_else = true;
|
|
ftepp_next(ftepp);
|
|
break;
|
|
}
|
|
else if (!strcmp(ftepp_tokval(ftepp), "endif")) {
|
|
if (!vec_size(ftepp->conditions)) {
|
|
ftepp_error(ftepp, "#endif without #if");
|
|
return false;
|
|
}
|
|
vec_pop(ftepp->conditions);
|
|
ftepp_next(ftepp);
|
|
break;
|
|
}
|
|
else {
|
|
ftepp_error(ftepp, "unrecognized preprocessor directive: `%s`", ftepp_tokval(ftepp));
|
|
return false;
|
|
}
|
|
break;
|
|
default:
|
|
ftepp_error(ftepp, "unexpected preprocessor token: `%s`", ftepp_tokval(ftepp));
|
|
return false;
|
|
case TOKEN_EOL:
|
|
ftepp_errorat(ftepp, ctx, "empty preprocessor directive");
|
|
return false;
|
|
case TOKEN_EOF:
|
|
ftepp_error(ftepp, "missing newline at end of file", ftepp_tokval(ftepp));
|
|
return false;
|
|
}
|
|
if (!ftepp_skipspace(ftepp))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static bool ftepp_preprocess(ftepp_t *ftepp)
|
|
{
|
|
ppmacro *macro;
|
|
bool newline = true;
|
|
|
|
ftepp->lex->flags.preprocessing = true;
|
|
ftepp->lex->flags.mergelines = false;
|
|
ftepp->lex->flags.noops = true;
|
|
|
|
ftepp_next(ftepp);
|
|
do
|
|
{
|
|
if (ftepp->token >= TOKEN_EOF)
|
|
break;
|
|
|
|
ftepp->newline = newline;
|
|
newline = false;
|
|
|
|
switch (ftepp->token) {
|
|
case TOKEN_KEYWORD:
|
|
case TOKEN_IDENT:
|
|
case TOKEN_TYPENAME:
|
|
macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
|
|
if (!macro) {
|
|
ftepp_out(ftepp, ftepp_tokval(ftepp), false);
|
|
ftepp_next(ftepp);
|
|
break;
|
|
}
|
|
if (!ftepp_macro_call(ftepp, macro))
|
|
ftepp->token = TOKEN_ERROR;
|
|
break;
|
|
case '#':
|
|
if (!ftepp->newline) {
|
|
ftepp_out(ftepp, ftepp_tokval(ftepp), false);
|
|
ftepp_next(ftepp);
|
|
break;
|
|
}
|
|
ftepp->lex->flags.mergelines = true;
|
|
if (ftepp_next(ftepp) >= TOKEN_EOF) {
|
|
ftepp_error(ftepp, "error in preprocessor directive");
|
|
ftepp->token = TOKEN_ERROR;
|
|
break;
|
|
}
|
|
if (!ftepp_hash(ftepp))
|
|
ftepp->token = TOKEN_ERROR;
|
|
ftepp->lex->flags.mergelines = false;
|
|
break;
|
|
case TOKEN_EOL:
|
|
newline = true;
|
|
ftepp_out(ftepp, "\n", true);
|
|
ftepp_next(ftepp);
|
|
break;
|
|
default:
|
|
ftepp_out(ftepp, ftepp_tokval(ftepp), false);
|
|
ftepp_next(ftepp);
|
|
break;
|
|
}
|
|
} while (!ftepp->errors && ftepp->token < TOKEN_EOF);
|
|
|
|
newline = ftepp->token == TOKEN_EOF;
|
|
ftepp_delete(ftepp);
|
|
return newline;
|
|
}
|
|
|
|
bool ftepp_preprocess_file(const char *filename)
|
|
{
|
|
ftepp_t *ftepp = ftepp_init();
|
|
ftepp->lex = lex_open(filename);
|
|
if (!ftepp->lex) {
|
|
con_out("failed to open file \"%s\"\n", filename);
|
|
return false;
|
|
}
|
|
return ftepp_preprocess(ftepp);
|
|
}
|
|
|
|
bool ftepp_preprocess_string(const char *name, const char *str)
|
|
{
|
|
ftepp_t *ftepp = ftepp_init();
|
|
ftepp->lex = lex_open_string(str, strlen(str), name);
|
|
if (!ftepp->lex) {
|
|
con_out("failed to create lexer for string \"%s\"\n", name);
|
|
return false;
|
|
}
|
|
return ftepp_preprocess(ftepp);
|
|
}
|