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gmqcc/parse.c

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/*
* Copyright (C) 2012
* Dale Weiler
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "gmqcc.h"
/* compile-time constant for constants */
typedef struct {
char *name;
int type;
float value[3];
char *string; /* string value if constant is string literal */
} constant;
VECTOR_MAKE(constant, compile_constants);
/*
* These are not lexical tokens: These are parse tree types. Most people
* perform tokenizing on language punctuation which is wrong. That stuff
* is technically already tokenized, it just needs to be parsed into a tree
*/
#define PARSE_TYPE_DO 0
#define PARSE_TYPE_ELSE 1
#define PARSE_TYPE_IF 2
#define PARSE_TYPE_WHILE 3
#define PARSE_TYPE_BREAK 4
#define PARSE_TYPE_CONTINUE 5
#define PARSE_TYPE_RETURN 6
#define PARSE_TYPE_GOTO 7
#define PARSE_TYPE_FOR 8
#define PARSE_TYPE_VOID 9
#define PARSE_TYPE_STRING 10
#define PARSE_TYPE_FLOAT 11
#define PARSE_TYPE_VECTOR 12
#define PARSE_TYPE_ENTITY 13
#define PARSE_TYPE_LAND 14
#define PARSE_TYPE_LOR 15
#define PARSE_TYPE_LTEQ 16
#define PARSE_TYPE_GTEQ 17
#define PARSE_TYPE_EQEQ 18
#define PARSE_TYPE_LNEQ 19
#define PARSE_TYPE_COMMA 20
#define PARSE_TYPE_LNOT 21
#define PARSE_TYPE_STAR 22
#define PARSE_TYPE_DIVIDE 23
#define PARSE_TYPE_LPARTH 24
#define PARSE_TYPE_RPARTH 25
#define PARSE_TYPE_MINUS 26
#define PARSE_TYPE_ADD 27
#define PARSE_TYPE_EQUAL 28
#define PARSE_TYPE_LBS 29
#define PARSE_TYPE_RBS 30
#define PARSE_TYPE_ELIP 31
#define PARSE_TYPE_DOT 32
#define PARSE_TYPE_LT 33
#define PARSE_TYPE_GT 34
#define PARSE_TYPE_BAND 35
#define PARSE_TYPE_BOR 36
#define PARSE_TYPE_DONE 37
#define PARSE_TYPE_IDENT 38
/*
* Adds a parse type to the parse tree, this is where all the hard
* work actually begins.
*/
#define PARSE_TREE_ADD(X) \
do { \
parsetree->next = mem_a(sizeof(struct parsenode)); \
parsetree->next->next = NULL; \
parsetree->next->type = (X); \
parsetree = parsetree->next; \
} while (0)
#define STORE(X) { \
printf(X); \
break; \
}
void parse_debug(struct parsenode *tree) {
long fill = 0;
while (tree) {
switch (tree->type) {
case PARSE_TYPE_ADD: STORE("OPERATOR: ADD \n");
case PARSE_TYPE_BAND: STORE("OPERATOR: BITAND \n");
case PARSE_TYPE_BOR: STORE("OPERATOR: BITOR \n");
case PARSE_TYPE_COMMA: STORE("OPERATOR: SEPERATOR\n");
case PARSE_TYPE_DOT: STORE("OPERATOR: DOT\n");
case PARSE_TYPE_DIVIDE: STORE("OPERATOR: DIVIDE\n");
case PARSE_TYPE_EQUAL: STORE("OPERATOR: ASSIGNMENT\n");
case PARSE_TYPE_BREAK: STORE("STATEMENT: BREAK \n");
case PARSE_TYPE_CONTINUE: STORE("STATEMENT: CONTINUE\n");
case PARSE_TYPE_GOTO: STORE("STATEMENT: GOTO\n");
case PARSE_TYPE_RETURN: STORE("STATEMENT: RETURN\n");
case PARSE_TYPE_DONE: STORE("STATEMENT: DONE\n");
case PARSE_TYPE_VOID: STORE("DECLTYPE: VOID\n");
case PARSE_TYPE_STRING: STORE("DECLTYPE: STRING\n");
case PARSE_TYPE_ELIP: STORE("DECLTYPE: VALIST\n");
case PARSE_TYPE_ENTITY: STORE("DECLTYPE: ENTITY\n");
case PARSE_TYPE_FLOAT: STORE("DECLTYPE: FLOAT\n");
case PARSE_TYPE_VECTOR: STORE("DECLTYPE: VECTOR\n");
case PARSE_TYPE_GT: STORE("TEST: GREATER THAN\n");
case PARSE_TYPE_LT: STORE("TEST: LESS THAN\n");
case PARSE_TYPE_GTEQ: STORE("TEST: GREATER THAN OR EQUAL\n");
case PARSE_TYPE_LTEQ: STORE("TEST: LESS THAN OR EQUAL\n");
case PARSE_TYPE_LNEQ: STORE("TEST: NOT EQUAL\n");
case PARSE_TYPE_EQEQ: STORE("TEST: EQUAL-EQUAL\n");
case PARSE_TYPE_LBS: STORE("BLOCK: BEG\n");
case PARSE_TYPE_RBS: STORE("BLOCK: END\n");
case PARSE_TYPE_ELSE: STORE("BLOCK: ELSE\n");
case PARSE_TYPE_IF: STORE("BLOCK: IF\n");
case PARSE_TYPE_LAND: STORE("LOGICAL: AND\n");
case PARSE_TYPE_LNOT: STORE("LOGICAL: NOT\n");
case PARSE_TYPE_LOR: STORE("LOGICAL: OR\n");
case PARSE_TYPE_LPARTH: STORE("PARTH: BEG\n");
case PARSE_TYPE_RPARTH: STORE("PARTH: END\n");
case PARSE_TYPE_WHILE: STORE("LOOP: WHILE\n");
case PARSE_TYPE_FOR: STORE("LOOP: FOR\n");
case PARSE_TYPE_DO: STORE("LOOP: DO\n");
}
tree = tree->next;
}
}
/*
* Performs a parse operation: This is a macro to prevent bugs, if the
* calls to lex_token are'nt exactly enough to feed to the end of the
* actual lexees for the current thing that is being parsed, the state
* of the next iteration in the creation of the parse tree will be wrong
* and everything will fail.
*/
#define PARSE_PERFORM(X,C) { \
token = lex_token(file); \
{ C } \
while (token != '\n') { \
token = lex_token(file); \
} \
PARSE_TREE_ADD(X); \
break; \
}
void parse_clear(struct parsenode *tree) {
if (!tree) return;
struct parsenode *temp = NULL;
while (tree != NULL) {
temp = tree;
tree = tree->next;
mem_d (temp);
}
/* free any potential typedefs */
typedef_clear();
}
/*
* Generates a parse tree out of the lexees generated by the lexer. This
* is where the tree is built. This is where valid check is performed.
*/
int parse_tree(struct lex_file *file) {
struct parsenode *parsetree = NULL;
struct parsenode *parseroot = NULL;
/*
* Allocate memory for our parse tree:
* the parse tree is just a singly linked list which will contain
* all the data for code generation.
*/
if (!parseroot) {
parseroot = mem_a(sizeof(struct parsenode));
if (!parseroot)
return error(ERROR_INTERNAL, "Ran out of memory", " ");
parsetree = parseroot;
parsetree->type = -1; /* not a valid type -- root element */
}
int token = 0;
while ((token = lex_token(file)) != ERROR_LEX && \
token != ERROR_COMPILER && \
token != ERROR_INTERNAL && \
token != ERROR_PARSE && \
token != ERROR_PREPRO && file->length >= 0) {
switch (token) {
case TOKEN_TYPEDEF: {
char *f; /* from */
char *t; /* to */
token = lex_token(file);
token = lex_token(file); f = util_strdup(file->lastok);
token = lex_token(file);
token = lex_token(file); t = util_strdup(file->lastok);
typedef_add(f, t);
mem_d(f);
mem_d(t);
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
if (token != ';')
error(ERROR_PARSE, "%s:%d Expected a `;` at end of typedef statement\n", file->name, file->line);
token = lex_token(file);
break;
}
case TOKEN_VOID: PARSE_TREE_ADD(PARSE_TYPE_VOID); goto fall;
case TOKEN_STRING: PARSE_TREE_ADD(PARSE_TYPE_STRING); goto fall;
case TOKEN_VECTOR: PARSE_TREE_ADD(PARSE_TYPE_VECTOR); goto fall;
case TOKEN_ENTITY: PARSE_TREE_ADD(PARSE_TYPE_ENTITY); goto fall;
case TOKEN_FLOAT: PARSE_TREE_ADD(PARSE_TYPE_FLOAT); goto fall;
{
fall:;
char *name = NULL;
int type = token; /* story copy */
/* skip over space */
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
/* save name */
name = util_strdup(file->lastok);
/* skip spaces */
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
if (token == ';') {
/*
* Definitions go to the defs table, they don't have
* any sort of data with them yet.
*/
} else if (token == '=') {
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
/* strings are in file->lastok */
switch (type) {
case TOKEN_VOID:
return error(ERROR_PARSE, "%s:%d Cannot assign value to type void\n", file->name, file->line);
/* TODO: Validate (end quote), strip quotes for constant add, name constant */
case TOKEN_STRING:
if (*file->lastok != '"')
error(ERROR_PARSE, "%s:%d Expected a '\"' (quote) for string constant\n", file->name, file->line);
/* add the compile-time constant */
compile_constants_add((constant){
.name = util_strdup(name),
.type = TYPE_STRING,
.value = {0,0,0},
.string = util_strdup(file->lastok)
});
break;
/* TODO: name constant, old qc vec literals, whitespace fixes, name constant */
case TOKEN_VECTOR: {
float compile_calc_x = 0;
float compile_calc_y = 0;
float compile_calc_z = 0;
int compile_calc_d = 0; /* dot? */
int compile_calc_s = 0; /* sign (-, +) */
char compile_data[1024];
char *compile_eval = compile_data;
if (token != '{')
error(ERROR_PARSE, "%s:%d Expected initializer list `{`,`}` for vector constant\n", file->name, file->line);
/*
* This parses a single vector element: x,y & z. This will handle all the
* complicated mechanics of a vector, and can be extended as well. This
* is a rather large macro, and is #undef'd after it's use below.
*/
#define PARSE_VEC_ELEMENT(NAME, BIT) \
token = lex_token(file); \
if (token == ' ') \
token = lex_token(file); \
if (token == '.') \
compile_calc_d = 1; \
if (!isdigit(token) && !compile_calc_d && token != '+' && token != '-') \
error(ERROR_PARSE,"%s:%d Invalid constant initializer element %c for vector, must be numeric\n", file->name, file->line, NAME); \
if (token == '+') \
compile_calc_s = '+'; \
if (token == '-' && !compile_calc_s) \
compile_calc_s = '-'; \
while (isdigit(token) || token == '.' || token == '+' || token == '-') { \
*compile_eval++ = token; \
token = lex_token(file); \
if (token == '.' && compile_calc_d) { \
error(ERROR_PARSE, "%s:%d Invalid constant initializer element %c for vector, must be numeric.\n", file->name, file->line, NAME); \
token = lex_token(file); \
} \
if ((token == '-' || token == '+') && compile_calc_s) { \
error(ERROR_PARSE, "%s:%d Invalid constant initializer sign for vector element %c\n", file->name, file->line, NAME); \
token = lex_token(file); \
} \
else if (token == '.' && !compile_calc_d) \
compile_calc_d = 1; \
else if (token == '-' && !compile_calc_s) \
compile_calc_s = '-'; \
else if (token == '+' && !compile_calc_s) \
compile_calc_s = '+'; \
} \
if (token == ' ') \
token = lex_token(file); \
if (NAME != 'z') { \
if (token != ',' && token != ' ') \
error(ERROR_PARSE, "%s:%d invalid constant initializer element %c for vector (missing spaces, or comma delimited list?)\n", file->name, file->line, NAME); \
} else if (token != '}') { \
error(ERROR_PARSE, "%s:%d Expected `}` on end of constant initialization for vector\n", file->name, file->line); \
} \
compile_calc_##BIT = atof(compile_data); \
compile_calc_d = 0; \
compile_calc_s = 0; \
compile_eval = &compile_data[0]; \
memset(compile_data, 0, sizeof(compile_data))
/*
* Parse all elements using the macro above.
* We must undef the macro afterwards.
*/
PARSE_VEC_ELEMENT('x', x);
PARSE_VEC_ELEMENT('y', y);
PARSE_VEC_ELEMENT('z', z);
#undef PARSE_VEC_ELEMENT
/* Check for the semi-colon... */
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
if (token != ';')
error(ERROR_PARSE, "%s:%d Expected `;` on end of constant initialization for vector\n", file->name, file->line);
/* add the compile-time constant */
compile_constants_add((constant){
.name = util_strdup(name),
.type = TYPE_VECTOR,
.value = {
[0] = compile_calc_x,
[1] = compile_calc_y,
[2] = compile_calc_z
},
.string = NULL
});
break;
}
case TOKEN_ENTITY:
case TOKEN_FLOAT: /*TODO: validate, constant generation, name constant */
if (!isdigit(token))
error(ERROR_PARSE, "%s:%d Expected numeric constant for float constant\n");
compile_constants_add((constant){
.name = util_strdup(name),
.type = TOKEN_FLOAT,
.value = {0,0,0},
.string = NULL
});
break;
}
} else if (token == '(') {
printf("FUNCTION ??\n");
}
mem_d(name);
}
/*
* From here down is all language punctuation: There is no
* need to actual create tokens from these because they're already
* tokenized as these individual tokens (which are in a special area
* of the ascii table which doesn't conflict with our other tokens
* which are higer than the ascii table.)
*/
case '#':
token = lex_token(file); /* skip '#' */
if (token == ' ')
token = lex_token(file);
/*
* If we make it here we found a directive, the supported
* directives so far are #include.
*/
if (strncmp(file->lastok, "include", sizeof("include")) == 0) {
/*
* We only suport include " ", not <> like in C (why?)
* because the latter is silly.
*/
while (*file->lastok != '"' && token != '\n')
token = lex_token(file);
if (token == '\n')
return error(ERROR_PARSE, "%d: Invalid use of include preprocessor directive: wanted #include \"file.h\"\n", file->line-1);
char *copy = util_strdup(file->lastok);
struct lex_file *next = lex_include(file, copy);
if (!next) {
error(ERROR_INTERNAL, "Include subsystem failure\n");
exit (-1);
}
parse_tree(next);
mem_d (copy);
lex_close (next);
}
/* skip all tokens to end of directive */
while (token != '\n')
token = lex_token(file);
break;
case LEX_IDENT:
token = lex_token(file);
PARSE_TREE_ADD(PARSE_TYPE_IDENT);
break;
}
}
parse_debug(parseroot);
lex_reset(file);
parse_clear(parseroot);
return 1;
}
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