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#include "cgen.h"
#include "fn.h"
#include "lex.h"
#include "lit.h"
#include "parse.h"
#include "storage.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
void cgen_free(struct cgen *c)
{
}
const char *cgen_sz(const size_t sz)
{
switch (sz)
{
case 1:
return "b";
case 2:
return "h";
case 4:
return "w";
case 8:
return "l";
default:
break;
}
return NULL;
}
const char *cgen_type(const struct type *t)
{
switch (t->sz)
{
case 1:
return t->sign ? "b" : "ub";
case 2:
return t->sign ? "h" : "uh";
case 4:
return t->sign ? "w" : "uw";
case 8:
return t->sign ? "l" : "ul";
default:
break;
}
return NULL;
}
const char *cgen_abity(const struct type *t)
{
switch (t->sz)
{
case 1:
return t->sign ? "b" : "ub";
case 2:
return t->sign ? "h" : "uh";
case 4:
return "w";
case 8:
return "l";
default:
break;
}
return NULL;
}
const char *cgen_load(const struct type *t)
{
switch (t->sz)
{
case 1:
return t->sign ? "sb" : "ub";
case 2:
return t->sign ? "sh" : "uh";
case 4:
return t->sign ? "sw" : "uw";
case 8:
return "l";
default:
break;
}
return NULL;
}
int cgen_param(const struct fn *fn, const struct stentry *e)
{
const struct pr *pr = fn->pr;
const char *name = e->tk->s;
for (size_t i = 0; i < pr->nparams; i++)
if (!strcmp(pr->params[i].tk->s, name))
return 1;
return 0;
}
int cgen_global(const struct fn *fn, const struct stentry *e)
{
const struct storage *ws = fn->ws, *gl = fn->gl;
const struct pr *pr = fn->pr;
const struct param *ret = pr->ret;
const char *name = e->tk->s;
/* A variable is only global if it is defined inside the global
* variables section ("gl"), or if it is not listed on the working
* storage section ("ws"), as a function parameter or a return value. */
if (gl)
for (size_t i = 0; i < gl->nentries; i++)
if (!strcmp(gl->entries[i].tk->s, name))
return 1;
if (cgen_param(fn, e))
return 0;
if (ret && !strcmp(ret->tk->s, name))
return 0;
if (ws)
for (size_t i = 0; i < ws->nentries; i++)
if (!strcmp(ws->entries[i].tk->s, name))
return 0;
return 1;
}
static void pushfmt(const char *type, const char *fmt)
{
printf("data $____fmt%s = { b \"%s\" , b 0 }\n", type, fmt);
}
int cgen(const struct ast *ast, struct cgen *c)
{
/* generate literals to use with printf(3) */
pushfmt("b", "%hhd");
pushfmt("h", "%hd");
pushfmt("w", "%d");
pushfmt("l", "%ld");
pushfmt("ub", "%hhu");
pushfmt("uh", "%hu");
pushfmt("uw", "%u");
pushfmt("ul", "%lu");
pushfmt("bx", "%#hhx");
pushfmt("hx", "%#hx");
pushfmt("wx", "%#x");
pushfmt("lx", "%#lx");
for (const struct lit *l = ast->lits; l; l = l->next)
if (lit_cgen(l))
return-1;
for (size_t i = 0; i < ast->nfns; i++)
if (fn_cgen((c->fn = &ast->fns[i]), c))
return -1;
return 0;
}
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