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gmqcc/assembler.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 "gmqcc.h"
/*
* This is the assembler, gmqas, this is being implemented because I'm
* not exactly sure how codegen would work for the C compiler as of yet
* and also I plan to allow inline assembly for the compiler.
*/
static const struct {
const char *m; /* menomic */
const size_t o; /* operands */
const size_t l; /* menomic len */
} const asm_instr[] = {
[INSTR_DONE] = { "DONE" , 1, 4 },
[INSTR_MUL_F] = { "MUL_F" , 3, 5 },
[INSTR_MUL_V] = { "MUL_V" , 3, 5 },
[INSTR_MUL_FV] = { "MUL_FV" , 3, 6 },
[INSTR_MUL_VF] = { "MUL_VF" , 3, 6 },
[INSTR_DIV_F] = { "DIV" , 0, 3 },
[INSTR_ADD_F] = { "ADD_F" , 3, 5 },
[INSTR_ADD_V] = { "ADD_V" , 3, 5 },
[INSTR_SUB_F] = { "SUB_F" , 3, 5 },
[INSTR_SUB_V] = { "DUB_V" , 3, 5 },
[INSTR_EQ_F] = { "EQ_F" , 0, 4 },
[INSTR_EQ_V] = { "EQ_V" , 0, 4 },
[INSTR_EQ_S] = { "EQ_S" , 0, 4 },
[INSTR_EQ_E] = { "EQ_E" , 0, 4 },
[INSTR_EQ_FNC] = { "ES_FNC" , 0, 6 },
[INSTR_NE_F] = { "NE_F" , 0, 4 },
[INSTR_NE_V] = { "NE_V" , 0, 4 },
[INSTR_NE_S] = { "NE_S" , 0, 4 },
[INSTR_NE_E] = { "NE_E" , 0, 4 },
[INSTR_NE_FNC] = { "NE_FNC" , 0, 6 },
[INSTR_LE] = { "LE" , 0, 2 },
[INSTR_GE] = { "GE" , 0, 2 },
[INSTR_LT] = { "LT" , 0, 2 },
[INSTR_GT] = { "GT" , 0, 2 },
[INSTR_LOAD_F] = { "FIELD_F" , 0, 7 },
[INSTR_LOAD_V] = { "FIELD_V" , 0, 7 },
[INSTR_LOAD_S] = { "FIELD_S" , 0, 7 },
[INSTR_LOAD_ENT] = { "FIELD_ENT" , 0, 9 },
[INSTR_LOAD_FLD] = { "FIELD_FLD" , 0, 9 },
[INSTR_LOAD_FNC] = { "FIELD_FNC" , 0, 9 },
[INSTR_ADDRESS] = { "ADDRESS" , 0, 7 },
[INSTR_STORE_F] = { "STORE_F" , 0, 7 },
[INSTR_STORE_V] = { "STORE_V" , 0, 7 },
[INSTR_STORE_S] = { "STORE_S" , 0, 7 },
[INSTR_STORE_ENT] = { "STORE_ENT" , 0, 9 },
[INSTR_STORE_FLD] = { "STORE_FLD" , 0, 9 },
[INSTR_STORE_FNC] = { "STORE_FNC" , 0, 9 },
[INSTR_STOREP_F] = { "STOREP_F" , 0, 8 },
[INSTR_STOREP_V] = { "STOREP_V" , 0, 8 },
[INSTR_STOREP_S] = { "STOREP_S" , 0, 8 },
[INSTR_STOREP_ENT] = { "STOREP_ENT", 0, 10},
[INSTR_STOREP_FLD] = { "STOREP_FLD", 0, 10},
[INSTR_STOREP_FNC] = { "STOREP_FNC", 0, 10},
[INSTR_RETURN] = { "RETURN" , 0, 6 },
[INSTR_NOT_F] = { "NOT_F" , 0, 5 },
[INSTR_NOT_V] = { "NOT_V" , 0, 5 },
[INSTR_NOT_S] = { "NOT_S" , 0, 5 },
[INSTR_NOT_ENT] = { "NOT_ENT" , 0, 7 },
[INSTR_NOT_FNC] = { "NOT_FNC" , 0, 7 },
[INSTR_IF] = { "IF" , 0, 2 },
[INSTR_IFNOT] = { "IFNOT" , 0, 5 },
[INSTR_CALL0] = { "CALL0" , 0, 5 },
[INSTR_CALL1] = { "CALL1" , 0, 5 },
[INSTR_CALL2] = { "CALL2" , 0, 5 },
[INSTR_CALL3] = { "CALL3" , 0, 5 },
[INSTR_CALL4] = { "CALL4" , 0, 5 },
[INSTR_CALL5] = { "CALL5" , 0, 5 },
[INSTR_CALL6] = { "CALL6" , 0, 5 },
[INSTR_CALL7] = { "CALL7" , 0, 5 },
[INSTR_CALL8] = { "CALL8" , 0, 5 },
[INSTR_STATE] = { "STATE" , 0, 5 },
[INSTR_GOTO] = { "GOTO" , 0, 4 },
[INSTR_AND] = { "AND" , 0, 3 },
[INSTR_OR] = { "OR" , 0, 2 },
[INSTR_BITAND] = { "BITAND" , 0, 6 },
[INSTR_BITOR] = { "BITOR" , 0, 5 }
};
/*
* Some assembler keywords not part of the opcodes above: these are
* for creating functions, or constants.
*/
const char *const asm_keys[] = {
"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) {
char *line = NULL;
ssize_t read = util_getline(&line, byte, fp);
*byte = read;
if (read == -1) {
mem_d (line);
return NULL;
}
return line;
}
#define asm_rmnewline(L,S) *((L)+*(S)-1) = '\0'
#define asm_skipwhite(L) \
while((*(L)==' '||*(L)=='\t')) { \
(L)++; \
}
void asm_init(const char *file, FILE **fp) {
*fp = fopen(file, "r");
code_init();
}
void asm_close(FILE *fp) {
fclose(fp);
code_write();
}
/*
* Following parse states:
* ASM_FUNCTION -- in a function accepting input statements
* ....
*/
typedef enum {
ASM_NULL,
ASM_FUNCTION
} asm_state;
typedef struct {
char *name; /* name of constant */
int offset; /* location in globals */
} globals;
VECTOR_MAKE(globals, assembly_constants);
void asm_clear() {
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) {
char *data = NULL;
char *skip = NULL;
long line = 1; /* current line */
size_t size = 0; /* size of line */
asm_state state = ASM_NULL;
while ((data = asm_getline(&size, fp)) != NULL) {
skip = data;
asm_skipwhite(skip);
asm_rmnewline(skip, &size);
#define DECLTYPE(X, CODE) \
if (!strncmp(X, skip, strlen(X))) { \
if (skip[strlen(X)] != ':') { \
printf("%li: Missing `:` after decltype\n",line); \
exit (1); \
} \
skip += strlen(X)+1; \
asm_skipwhite(skip); \
if(!isalpha(*skip)) { \
printf("%li: Invalid identififer: %s\n", line, skip); \
exit (1); \
} else { \
size_t offset_code = code_statements_elements+1; \
size_t offset_chars = code_strings_elements +1; \
size_t offset_globals = code_globals_elements +1; \
size_t offset_functions = code_functions_elements +1; \
size_t offset_fields = code_fields_elements +1; \
size_t offset_defs = code_defs_elements +1; \
CODE \
/* silent unused warnings */ \
(void)offset_code; \
(void)offset_chars; \
(void)offset_globals; \
(void)offset_functions; \
(void)offset_fields; \
(void)offset_defs; \
assembly_constants_add((globals){ \
.name = util_strdup(skip), \
.offset = offset_globals \
}); \
} \
goto end; \
}
/* FLOAT */
DECLTYPE(asm_keys[0], {
code_defs_add((prog_section_def){
.type = TYPE_FLOAT,
.offset = offset_globals, /* global table */
.name = offset_chars /* string table TODO */
});
float f = 0; /*TODO*/
code_globals_add(*(int*)&f);
});
DECLTYPE(asm_keys[1], {
code_defs_add((prog_section_def){
.type = TYPE_FLOAT,
.offset = offset_globals, /* global table */
.name = offset_chars /* string table TODO */
});
float f1 = 0;
float f2 = 0;
float f3 = 0;
code_globals_add(*(int*)&f1);
code_globals_add(*(int*)&f2);
code_globals_add(*(int*)&f3);
});
/* ENTITY */ DECLTYPE(asm_keys[2], {});
/* FIELD */ DECLTYPE(asm_keys[3], {});
/* STRING */
DECLTYPE(asm_keys[4], {
code_defs_add((prog_section_def){
.type = TYPE_STRING,
.offset = offset_globals, /* offset to offset in string table (for data)*/
.name = offset_chars /* location of name in string table (for name)*/
});
code_strings_add('h');
});
/* FUNCTION */
DECLTYPE(asm_keys[5], {
/* TODO: parse */
if (state != ASM_NULL) {
printf("%li: Error unfinished function block, expected DONE or RETURN\n", line);
goto end;
}
state = ASM_FUNCTION;
code_defs_add((prog_section_def){
.type = TYPE_VOID,
.offset = offset_globals,
.name = offset_chars
});
code_globals_add(offset_functions);
code_functions_add((prog_section_function){
.entry = offset_code,
.firstlocal = 0,
.locals = 0,
.profile = 0,
.name = offset_chars,
.file = 0,
.nargs = 0,
.argsize = {0}
});
});
/* if we make it this far then we have statements */
{
size_t i = 0; /* counter */
size_t o = 0; /* operands */
char *t = NULL; /* token */
/*
* Most ops a single statement can have is three.
* lets allocate some space for all of those here.
*/
char op[3][32768] = {{0},{0},{0}};
for (; i < sizeof(asm_instr)/sizeof(*asm_instr); i++) {
if (!strncmp(skip, asm_instr[i].m, asm_instr[i].l)) {
if (state != ASM_FUNCTION) {
printf("%li: Statement not inside function block\n", line);
goto end;
}
/* update parser state */
if (i == INSTR_DONE || i == INSTR_RETURN) {
goto end;
state = ASM_NULL;
}
/* parse the statement */
o = asm_instr[i].o; /* operands */
skip += asm_instr[i].l; /* skip instruction */
t = strtok(skip, " ,");
i = 0;
while (t != NULL && i < 3) {
strcpy(op[i], t);
t = strtok(NULL, " ,");
i ++;
}
util_debug("ASM", "Operand 1: %s\n", util_strrnl(op[0]));
util_debug("ASM", "Operand 2: %s\n", util_strrnl(op[1]));
util_debug("ASM", "Operand 3: %s\n", util_strrnl(op[2]));
/* check */
if (i != o) {
printf("not enough operands, expected: %li, got %li\n", o, i);
}
/* TODO: hashtable value LOAD .... etc */
code_statements_add((prog_section_statement){
i, {0}, {0}, {0}
});
goto end;
}
}
}
/* if we made it this far something is wrong */
if (*skip != '\0')
printf("%li: Invalid statement, expression, or decleration\n", line);
end:
mem_d(data);
line ++;
}
asm_clear();
}
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