gmqcc/asm.c

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/*
* Copyright (C) 2012
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* 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 "gmqcc.h"
/*
* Some assembler keywords not part of the opcodes above: these are
* for creating functions, or constants.
*/
const char *const asm_keys[] = {
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"FLOAT" , /* define float */
"VECTOR" , /* define vector */
"ENTITY" , /* define ent */
"FIELD" , /* define field */
"STRING" , /* define string */
"FUNCTION"
};
static char *const asm_getline(size_t *byte, FILE *fp) {
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char *line = NULL;
ssize_t read = util_getline(&line, byte, fp);
*byte = read;
if (read == -1) {
mem_d (line);
return NULL;
}
return line;
}
void asm_init(const char *file, FILE **fp) {
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*fp = fopen(file, "r");
code_init();
}
void asm_close(FILE *fp) {
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fclose(fp);
code_write();
}
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/*
* Following parse states:
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* ASM_FUNCTION -- in a function accepting input statements
* ....
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*/
typedef enum {
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ASM_NULL,
ASM_FUNCTION
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} asm_state;
typedef struct {
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char *name; /* name of constant */
int offset; /* location in globals */
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} globals;
VECTOR_MAKE(globals, assembly_constants);
void asm_clear() {
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size_t i = 0;
for (; i < assembly_constants_elements; i++)
mem_d(assembly_constants_data[i].name);
mem_d(assembly_constants_data);
}
void asm_parse(FILE *fp) {
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char *data = NULL;
long line = 1; /* current line */
size_t size = 0; /* size of line */
asm_state state = ASM_NULL;
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while ((data = asm_getline(&size, fp)) != NULL) {
data = util_strsws(data); /* skip whitespace */
data = util_strrnl(data); /* delete newline */
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/* TODO: everything */
(void)state;
goto end;
end:
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mem_d(data);
line ++;
}
asm_clear();
}