*/
#include "gmqcc.h"
/*
- * Some assembler keywords not part of the opcodes above: these are
- * for creating functions, or constants.
+ * Following parse states:
+ * ASM_FUNCTION -- in a function accepting input statements
+ * ....
*/
-const char *const asm_keys[] = {
- "FLOAT" , /* define float */
- "VECTOR" , /* define vector */
- "ENTITY" , /* define ent */
- "FIELD" , /* define field */
- "STRING" , /* define string */
- "FUNCTION"
-};
+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);
+/*
+ * Assembly text processing: this handles the internal collection
+ * of text to allow parsing and assemblation.
+ */
static char *const asm_getline(size_t *byte, FILE *fp) {
char *line = NULL;
ssize_t read = util_getline(&line, byte, fp);
return line;
}
+/*
+ * Entire external interface for main.c - to perform actual assemblation
+ * of assembly files.
+ */
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++)
* are locals.
*/
static inline bool asm_parse_type(const char *skip, size_t line, asm_state *state) {
- if (strstr(skip, "FLOAT:") == &skip[0]) { return true; }
- if (strstr(skip, "VECTOR:") == &skip[0]) { return true; }
- if (strstr(skip, "ENTITY:") == &skip[0]) { return true; }
- if (strstr(skip, "FIELD:") == &skip[0]) { return true; }
- if (strstr(skip, "STRING:") == &skip[0]) { return true; }
+ if (!(strstr(skip, "FLOAT:") == &skip[0]) &&
+ (strstr(skip, "VECTOR:") == &skip[0]) &&
+ (strstr(skip, "ENTITY:") == &skip[0]) &&
+ (strstr(skip, "FIELD:") == &skip[0]) &&
+ (strstr(skip, "STRING:") == &skip[0])) return false;
+
+ /* TODO: determine if constant, global, or local */
+ switch (*skip) {
+ /* VECTOR */ case 'V': {
+ const char *find = skip + 7;
+ while (*find == ' ' || *find == '\t') find++;
+ printf("found VECTOR %s\n", find);
+ break;
+ }
+ /* ENTITY */ case 'E': {
+ const char *find = skip + 7;
+ while (*find == ' ' || *find == '\t') find++;
+ printf("found ENTITY %s\n", find);
+ break;
+ }
+ /* STRING */ case 'S': {
+ const char *find = skip + 7;
+ while (*find == ' ' || *find == '\t') find++;
+ printf("found STRING %s\n", find);
+ break;
+ }
+ }
+
return false;
}
return false;
if (strstr(skip, "FUNCTION:") == &skip[0]) {
- *state = ASM_FUNCTION; /* update state */
- /* TODO */
+ char *copy = util_strsws(skip+10);
+ char *name = util_strchp(copy, strchr(copy, '\0'));
+
+ /* TODO: failure system, missing name */
+ if (!name) {
+ printf("expected name on function\n");
+ mem_d(copy);
+ mem_d(name);
+ return false;
+ }
+ /* TODO: failure system, invalid name */
+ if (!isalpha(*name) || util_strupper(name)) {
+ printf("invalid identifer for function name\n");
+ mem_d(copy);
+ mem_d(name);
+ return false;
+ }
+
+ /*
+ * Function could be internal function, look for $
+ * to determine this.
+ */
+ if (strchr(name, ',')) {
+ char *find = strchr(name, ',') + 1;
+
+ /* skip whitespace */
+ while (*find == ' ' || *find == '\t')
+ find++;
+
+ if (*find != '$') {
+ printf("expected $ for internal function selection, got %s instead\n", find);
+ mem_d(copy);
+ mem_d(name);
+ return false;
+ }
+ find ++;
+ if (!isdigit(*find)) {
+ printf("invalid internal identifier, expected valid number\n");
+ mem_d(copy);
+ mem_d(name);
+ return false;
+ }
+ /* reassign name */
+ mem_d(name);
+ name = util_strchp(name, strchr(name, ','));
+
+ /*
+ * Now add the following items to the code system:
+ * function
+ * definition (optional)
+ * global (optional)
+ * name
+ */
+ code_functions_add((prog_section_function){
+ -atoi(find), /* needs to be negated */
+ 0, 0, 0,
+ .name = code_chars_elements,
+ 0, 0,{0}
+ });
+ code_defs_add((prog_section_def){
+ .type = TYPE_FUNCTION,
+ .offset = code_globals_elements,
+ .name = code_chars_elements
+ });
+ code_globals_add(code_chars_elements);
+
+ code_chars_put(name, strlen(name));
+ code_chars_add('\0');
+
+ /*
+ * Sanatize the numerical constant used to select the
+ * internal function. Must ensure it's all numeric, since
+ * atoi can silently drop characters from a string and still
+ * produce a valid constant that would lead to runtime problems.
+ */
+ if (util_strdigit(find))
+ printf("found internal function %s, -%d\n", name, atoi(find));
+ else
+ printf("invalid internal function identifier, must be all numeric\n");
+
+ } else {
+ /* TODO: function bodies */
+ }
+
+ mem_d(copy);
+ mem_d(name);
return true;
}
return false;
size_t size = 0; /* size of line */
asm_state state = ASM_NULL;
- #define asm_end(x) do { mem_d(data); line++; printf(x); } while (0); continue
+ #define asm_end(x) \
+ do { \
+ mem_d(data); \
+ mem_d(copy); \
+ line++; \
+ util_debug("ASM", x); \
+ } while (0); continue
while ((data = asm_getline (&size, fp)) != NULL) {
- data = util_strsws(data,&skip); /* skip whitespace */
- data = util_strrnl(data); /* delete newline */
+ char *copy = util_strsws(data); /* skip whitespace */
+ skip = util_strrnl(copy); /* delete newline */
/* parse type */
- if(asm_parse_type(skip, line, &state)){ asm_end(""); }
+ if(asm_parse_type(skip, line, &state)){ asm_end("asm_parse_type\n"); }
/* parse func */
- if(asm_parse_func(skip, line, &state)){ asm_end(""); }
+ if(asm_parse_func(skip, line, &state)){ asm_end("asm_parse_func\n"); }
+
+ /* statement closure */
+ if (state == ASM_FUNCTION && (
+ (strstr(skip, "DONE") == &skip[0])||
+ (strstr(skip, "RETURN") == &skip[0]))) state = ASM_NULL;
/* TODO: everything */
(void)state;
+ asm_end("asm_parse_end\n");
}
+ #undef asm_end
asm_clear();
}
projects / xonotic / gmqcc.git / blobdiff