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-rw-r--r--src/lower.c288
1 files changed, 116 insertions, 172 deletions
diff --git a/src/lower.c b/src/lower.c
index 91cc6f9..16318b3 100644
--- a/src/lower.c
+++ b/src/lower.c
@@ -134,22 +134,11 @@ static bool is_small_type(struct type *type)
}
#define retval_create() \
- vec_create(sizeof(struct retval))
+ (struct retval){0, NULL}
-#define foreach_retval(ri, retval) \
- foreach_vec(ri, retval)
-
-#define retval_at(rv, ri) \
- vect_at(struct retval, rv, ri)
-
-static void retval_destroy(struct vec *retval)
+static void retval_destroy(struct retval *retval)
{
- foreach_retval(ri, *retval) {
- struct retval s = retval_at(*retval, ri);
- free(s.s);
- }
-
- vec_destroy(retval);
+ free(retval->s);
}
static struct retval build_retval(enum retval_kind kind, char *s)
@@ -157,6 +146,16 @@ static struct retval build_retval(enum retval_kind kind, char *s)
return (struct retval){.kind = kind, .s = s};
}
+static void strvec_destroy(struct vec *v)
+{
+ foreach_vec(vi, *v) {
+ char *s = vect_at(char *, *v, vi);
+ free(s);
+ }
+
+ vec_destroy(v);
+}
+
static __attribute__((format (printf, 1, 2)))
char *build_str(const char *fmt, ...) {
va_list args1, args2;
@@ -243,7 +242,7 @@ static ssize_t visit_struct(struct lower_state *s, struct ast *def, size_t base,
}
static int lower_expr(struct lower_state *s, struct ast *e,
- struct vec *retval);
+ struct retval *retval);
static int lower_statement(struct lower_state *s, struct ast *n);
static void output_ast_id(struct ast *id)
@@ -284,6 +283,7 @@ static int lower_global_var(struct ast *n)
static int lower_simple_param(struct lower_state *s, struct ast *p)
{
+ UNUSED(s);
char *t = is_small_type(p->t) ? "i9" : "i27";
printf("%s ", t);
output_ast_id(p);
@@ -298,6 +298,7 @@ struct struct_param_helper {
static int collect_struct_param(struct lower_state *s, struct ast *n, size_t offset, struct struct_param_helper *h)
{
+ UNUSED(s);
size_t size = type_size(n->t);
assert(size == 1 || size == 3);
@@ -352,10 +353,10 @@ static int lower_params(struct lower_state *s, struct ast *params, struct vec *f
}
static int lower_var(struct lower_state *s, struct ast *v,
- struct vec *retval)
+ struct retval *retval)
{
assert(v->k == AST_VAR_DEF);
- struct vec input = retval_create();
+ struct retval input = retval_create();
if (lower_expr(s, var_init(v), &input)) {
retval_destroy(&input);
return -1;
@@ -364,41 +365,28 @@ static int lower_var(struct lower_state *s, struct ast *v,
char *name = mangle(v);
/* if we're a struct, we can just reuse the newly built constant struct,
* yay, just rename it */
- printf("i27 %s = %s;\n", name, (retval_at(input, 0)).s);
- struct retval n = build_retval(REG_I27, name);
- vec_append(retval, &n);
-
+ printf("i27 %s = %s;\n", name, input.s);
+ *retval = build_retval(REG_I27, name);
retval_destroy(&input);
return 0;
}
-static void do_const_store(struct lower_state *s, struct vec *from,
+static void do_const_store(struct lower_state *s, struct retval *from,
struct retval t, struct retval o)
{
UNUSED(s);
/* I know, kind of silly to swap back and forth between string/int but
* good enough for now */
int64_t addr = strtoll(t.s, 0, 0) + strtoll(o.s, 0, 0);
- foreach_retval(ri, *from) {
- struct retval r = retval_at(*from, ri);
- /* doesn't really take into account possible padding etc, should
- * probably fix at some point */
- printf("%s >> %s (%zi);\n",
- r.s, retval_type_str(r), addr);
-
- addr += retval_width(r);
- }
+ printf("%s >> %s (%zi);\n", from->s, retval_type_str(*from), addr);
}
-static void do_store(struct lower_state *s, struct vec *from, struct vec *to,
- struct vec *off)
+static void do_store(struct lower_state *s, struct retval *from, struct retval *to, struct retval *off)
{
- assert(vec_len(to) == 1);
- struct retval t = retval_at(*to, 0);
-
+ struct retval t = *to;
struct retval o = build_retval(CONST_I27, "0");
if (off)
- o = retval_at(*off, 0);
+ o = *off;
if (retval_is_const(t) && retval_is_const(o)) {
do_const_store(s, from, t, o);
@@ -414,19 +402,13 @@ static void do_store(struct lower_state *s, struct vec *from, struct vec *to,
assert(retval_is_const(o));
int64_t addr = strtoll(o.s, 0, 0);
- foreach_retval(ri, *from) {
- struct retval r = retval_at(*from, ri);
/* doesn't really take into account possible padding etc, should
* probably fix at some point */
- printf("%s >> %s %s %zi;\n",
- r.s, retval_type_str(r), t.s, addr);
-
- addr += retval_width(r);
- }
+ printf("%s >> %s %s %zi;\n", from->s, retval_type_str(t), t.s, addr);
}
static int lower_cast(struct lower_state *s, struct ast *e,
- struct vec *retval)
+ struct retval *retval)
{
assert(e->k == AST_CAST);
/** @todo make sure actualize removes casts that aren't of these types
@@ -437,45 +419,38 @@ static int lower_cast(struct lower_state *s, struct ast *e,
return -1;
enum retval_kind kind = is_small_type(e->t) ? REG_I9 : REG_I27;
+ /* build new temporary cast result and replace the previous
+ * retval */
+ char *cast = build_str("%s%s", "cast", retval->s);
- foreach_retval(ri, *retval) {
- struct retval r = retval_at(*retval, ri);
- /* build new temporary cast result and replace the previous
- * retval */
- char *s = build_str("%s%s", "cast", r.s);
-
- printf("%s %s = %s;\n", retval_kind_str(kind), s, r.s);
- free(r.s);
-
- r.s = s;
- r.kind = kind;
- retval_at(*retval, ri) = r;
- }
+ printf("%s %s = %s;\n", retval_kind_str(kind), cast, retval->s);
+ free(retval->s);
+ retval->s = cast;
+ retval->kind = kind;
return 0;
}
static int lower_const(struct lower_state *s, struct ast *c,
- struct vec *retval)
+ struct retval *retval)
{
UNUSED(s);
assert(is_const(c));
char *str = build_str("%lli", (long long)c->v);
enum retval_kind kind = is_small_type(c->t) ? CONST_I9: CONST_I27;
- struct retval r = build_retval(kind, str);
- vec_append(retval, &r);
+ *retval = build_retval(kind, str);
return 0;
}
static int lower_assign(struct lower_state *s, struct ast *a,
- struct vec *retval)
+ struct retval *retval)
{
assert(a->k == AST_ASSIGN);
if (lower_expr(s, assign_from(a), retval))
return -1;
- struct vec loc = retval_create();
- struct vec off = retval_create();
+ struct retval loc = retval_create();
+ struct retval off = retval_create();
struct ast *to = assign_to(a);
struct ast *base = to;
@@ -501,13 +476,9 @@ static int lower_assign(struct lower_state *s, struct ast *a,
}
else if (to->k == AST_ARR) {
do_store(s, retval, &loc, &off);
- } else {
- assert(vec_len(retval) == vec_len(&loc));
- foreach_retval(ri, *retval) {
- struct retval to = retval_at(loc, ri);
- struct retval from = retval_at(*retval, ri);
- printf("i27 %s = %s;\n", to.s, from.s);
- }
+ }
+ else {
+ printf("i27 %s = %s;\n", loc.s, retval->s);
}
retval_destroy(&loc);
@@ -518,7 +489,7 @@ static int lower_assign(struct lower_state *s, struct ast *a,
}
static int lower_id(struct lower_state *s, struct ast *id,
- struct vec *retval)
+ struct retval *retval)
{
UNUSED(s);
assert(id->k == AST_ID);
@@ -535,8 +506,7 @@ static int lower_id(struct lower_state *s, struct ast *id,
free(o);
}
- struct retval r = build_retval(kind, m);
- vec_append(retval, &r);
+ *retval = build_retval(kind, m);
return 0;
}
@@ -547,6 +517,7 @@ struct struct_return_helper {
static int lower_struct_return(struct lower_state *s, struct ast *n, size_t o, struct struct_return_helper *h)
{
+ UNUSED(s);
size_t size = type_size(n->t);
assert(size == 1 || size == 3);
@@ -558,7 +529,7 @@ static int lower_struct_return(struct lower_state *s, struct ast *n, size_t o, s
}
static int lower_return(struct lower_state *s, struct ast *r,
- struct vec *retval)
+ struct retval *retval)
{
assert(r->k == AST_RETURN);
if (!return_expr(r)) {
@@ -570,7 +541,7 @@ static int lower_return(struct lower_state *s, struct ast *r,
if (lower_expr(s, return_expr(r), retval))
return -1;
- char *name = (retval_at(*retval, 0)).s;
+ char *name = retval->s;
if (is_primitive(r->t) || r->t->k == TYPE_PTR) {
printf("=> (%s);\n", name);
return 0;
@@ -594,13 +565,12 @@ static int lower_return(struct lower_state *s, struct ast *r,
}
static int lower_if(struct lower_state *s, struct ast *i,
- struct vec *retval)
+ struct retval *retval)
{
assert(i->k == AST_IF);
if (lower_expr(s, if_cond(i), retval))
return -1;
- assert(vec_len(retval) == 1);
/* helps readability a little bit */
long long uniq = s->uniq++;
printf("if%lli:\n", uniq);
@@ -608,7 +578,7 @@ static int lower_if(struct lower_state *s, struct ast *i,
char *bottom = build_str("if_else%lli", uniq);
char *out = build_str("if_out%lli", uniq);
- printf("! %s -> %s;\n", (retval_at(*retval, 0)).s, bottom);
+ printf("! %s -> %s;\n", retval->s, bottom);
/* a block counts as a statement in this case */
if (lower_statement(s, if_body(i))) {
@@ -631,7 +601,7 @@ static int lower_if(struct lower_state *s, struct ast *i,
}
static int lower_for(struct lower_state *s, struct ast *f,
- struct vec *retval)
+ struct retval *retval)
{
assert(f->k == AST_FOR);
if (lower_statement(s, for_pre(f)))
@@ -665,26 +635,27 @@ static int lower_for(struct lower_state *s, struct ast *f,
return -1;
}
- assert(vec_len(retval) == 1);
- printf("%s -> %s;\n", (retval_at(*retval, 0)).s, top);
+ printf("%s -> %s;\n", retval->s, top);
pop_loop(s);
return 0;
}
static int lower_expr_if(struct lower_state *s, struct ast *i,
- struct vec *retval)
+ struct retval *retval)
{
+ UNUSED(s);
+ UNUSED(retval);
semantic_error(i->scope->fctx, i,
"expr if unimplemented");
return 0;
}
static int lower_binop(struct lower_state *s, struct ast *i,
- struct vec *retval)
+ struct retval *retval)
{
- struct vec l = retval_create();
- struct vec r = retval_create();
+ struct retval l = retval_create();
+ struct retval r = retval_create();
if (lower_expr(s, binop_left(i), &l)) {
retval_destroy(&l);
@@ -698,12 +669,9 @@ static int lower_binop(struct lower_state *s, struct ast *i,
return -1;
}
- assert(vec_len(&l) == 1);
- assert(vec_len(&r) == 1);
char *name = build_str("binop%lli", (long long)s->uniq++);
- struct retval ret = build_retval(REG_I27, name);
- vec_append(retval, &ret);
+ *retval = build_retval(REG_I27, name);
char *op = "";
switch (i->k) {
@@ -721,10 +689,7 @@ static int lower_binop(struct lower_state *s, struct ast *i,
return -1;
}
- printf("i27 %s = %s %s %s;\n", name,
- (retval_at(l, 0)).s,
- op,
- (retval_at(r, 0)).s);
+ printf("i27 %s = %s %s %s;\n", name, l.s, op, r.s);
retval_destroy(&l);
retval_destroy(&r);
@@ -732,11 +697,11 @@ static int lower_binop(struct lower_state *s, struct ast *i,
}
static int lower_comparison(struct lower_state *s, struct ast *i,
- struct vec *retval)
+ struct retval *retval)
{
/* very similar to lower_binop, hmm */
- struct vec l = retval_create();
- struct vec r = retval_create();
+ struct retval l = retval_create();
+ struct retval r = retval_create();
if (lower_expr(s, comparison_left(i), &l)) {
retval_destroy(&l);
@@ -750,12 +715,8 @@ static int lower_comparison(struct lower_state *s, struct ast *i,
return -1;
}
- assert(vec_len(&l) == 1);
- assert(vec_len(&r) == 1);
-
char *name = build_str("comp%lli", (long long)s->uniq++);
- struct retval ret = build_retval(REG_I27, name);
- vec_append(retval, &ret);
+ *retval = build_retval(REG_I27, name);
char *op = "";
switch (i->k) {
@@ -772,10 +733,7 @@ static int lower_comparison(struct lower_state *s, struct ast *i,
return -1;
}
- printf("i9 %s = %s %s %s;\n", name,
- (retval_at(l, 0)).s,
- op,
- (retval_at(r, 0)).s);
+ printf("i9 %s = %s %s %s;\n", name, l.s, op, r.s);
retval_destroy(&l);
retval_destroy(&r);
@@ -784,25 +742,19 @@ static int lower_comparison(struct lower_state *s, struct ast *i,
static int lower_simple_arg(struct lower_state *s, struct ast *c, struct vec *retval)
{
- struct vec arg = retval_create();
+ struct retval arg = retval_create();
if (lower_expr(s, c, &arg)) {
retval_destroy(&arg);
return -1;
}
- assert(vec_len(&arg) == 1);
- struct retval r = retval_at(arg, 0);
- /* very important! */
- r.s = strdup(r.s);
- vec_append(retval, &r);
-
- retval_destroy(&arg);
+ vec_append(retval, &arg);
return 0;
}
struct struct_arg_helper {
char *name;
- struct vec *retval;
+ struct vec *args;
};
static int collect_struct_arg(struct lower_state *s, struct ast *n, size_t offset, struct struct_arg_helper *h)
@@ -815,21 +767,21 @@ static int collect_struct_arg(struct lower_state *s, struct ast *n, size_t offse
printf("%s %s << %s %zd;\n", type, tmp, h->name, offset);
struct retval r = build_retval(size == 1 ? REG_I9 : REG_I27, tmp);
- vect_append(char *, *h->retval, &r);
+ vect_append(struct retval, *h->args, &r);
return 0;
}
-static int lower_struct_arg(struct lower_state *s, struct ast *c, struct vec *retval)
+static int lower_struct_arg(struct lower_state *s, struct ast *c, struct vec *args)
{
- struct vec arg = retval_create();
+ struct retval arg = retval_create();
if (lower_expr(s, c, &arg)) {
retval_destroy(&arg);
return -1;
}
struct ast *def = c->t->d;
- char *name = (retval_at(arg, 0)).s;
- struct struct_arg_helper h = {name, retval};
+ char *name = arg.s;
+ struct struct_arg_helper h = {name, args};
int ret = visit_struct(s, def, 0, (visit_struct_t)collect_struct_arg, &h) < 0;
retval_destroy(&arg);
return ret;
@@ -855,7 +807,7 @@ static int collect_struct_retval(struct lower_state *s, struct ast *n, size_t of
return 0;
}
-static void lower_struct_retval(struct lower_state *s, struct type *rtype, char *rbuf, struct vec *retval)
+static void lower_struct_retval(struct lower_state *s, struct type *rtype, char *rbuf, struct retval *retval)
{
struct ast *def = rtype->d;
struct vec stores = vec_create(sizeof(char *));
@@ -875,24 +827,21 @@ static void lower_struct_retval(struct lower_state *s, struct type *rtype, char
}
vec_destroy(&stores);
- struct retval r = build_retval(REG_I27, rbuf);
- vec_append(retval, &r);
+ *retval = build_retval(REG_I27, rbuf);
}
-static void lower_simple_retval(struct lower_state *s, struct type *rtype, struct vec *retval)
+static void lower_simple_retval(struct lower_state *s, struct type *rtype, struct retval *retval)
{
-
char *name = build_str("(rv_%zd);\n", s->uniq++);
- struct retval r = build_retval(is_small_type(rtype) ? REG_I9 : REG_I27, name);
- vec_append(retval, &r);
+ *retval = build_retval(is_small_type(rtype) ? REG_I9 : REG_I27, name);
}
static int lower_call(struct lower_state *s, struct ast *c,
- struct vec *retval)
+ struct retval *retval)
{
assert(c->k == AST_CALL);
- struct vec call = retval_create();
+ struct retval call = retval_create();
if (lower_expr(s, call_expr(c), &call)) {
retval_destroy(&call);
return -1;
@@ -906,11 +855,11 @@ static int lower_call(struct lower_state *s, struct ast *c,
}
/* collect all args */
- struct vec args = retval_create();
+ struct vec args = vec_create(sizeof(struct retval));
foreach_node(a, call_args(c)) {
if (a->t->k == TYPE_STRUCT) {
if (lower_struct_arg(s, a, &args)) {
- retval_destroy(&args);
+ strvec_destroy(&args);
return -1;
}
@@ -918,20 +867,20 @@ static int lower_call(struct lower_state *s, struct ast *c,
}
if (lower_simple_arg(s, a, &args)) {
- retval_destroy(&args);
+ strvec_destroy(&args);
return -1;
}
}
- assert(vec_len(&call) == 1);
- printf("%s (", (retval_at(call, 0)).s);
+ printf("%s (", call.s);
retval_destroy(&call);
- foreach_retval(ri, args) {
- struct retval r = retval_at(args, ri);
+ foreach_vec(ai, args) {
+ struct retval r = vect_at(struct retval, args, ai);
printf("%s, ", r.s);
+ free(r.s);
}
- retval_destroy(&args);
+ vec_destroy(&args);
printf(") => ");
@@ -949,7 +898,7 @@ static int lower_call(struct lower_state *s, struct ast *c,
}
static int lower_init(struct lower_state *s, struct ast *init,
- struct vec *retval)
+ struct retval *retval)
{
assert(init->k == AST_INIT);
char *name = build_str("init_%zi", s->uniq++);
@@ -963,7 +912,7 @@ static int lower_init(struct lower_state *s, struct ast *init,
add_dealloc(s, dealloc);
foreach_node(n, init_body(init)) {
- struct vec val = retval_create();
+ struct retval val = retval_create();
if (lower_expr(s, var_init(n), &val)) {
retval_destroy(&val);
return -1;
@@ -974,35 +923,31 @@ static int lower_init(struct lower_state *s, struct ast *init,
printf("i27 %soff = %s + %zi;\n", name, name, offset);
char *type = is_small_type(n->t) ? "i9" : "i27";
- struct retval r = retval_at(val, 0);
if (n->t->k == TYPE_STRUCT)
- printf("%soff <<* %zi %s;\n", name, size, r.s);
+ printf("%soff <<* %zi %s;\n", name, size, val.s);
else
- printf("%s >> %s %soff;\n", r.s, type, name);
+ printf("%s >> %s %soff;\n", val.s, type, name);
retval_destroy(&val);
}
- struct retval r = build_retval(REG_I27, name);
- vec_reset(retval);
- vect_append(struct retval, *retval, &r);
-
+ *retval = build_retval(REG_I27, name);
return 0;
}
-static int lower_fetch(struct lower_state *s, struct ast *f, struct vec *retval)
+static int lower_fetch(struct lower_state *s, struct ast *f, struct retval *retval)
{
+ UNUSED(s);
/* at this point all fetches should exclusively be about fetching a
* specific function from a struct */
assert(f->k == AST_FETCH);
assert(f->t->k == TYPE_CALLABLE);
char *name = mangle(f);
- struct retval r = build_retval(REG_I27, name);
- vec_append(retval, &r);
+ *retval = build_retval(REG_I27, name);
return 0;
}
-static int lower_ref(struct lower_state *s, struct ast *r, struct vec *retval)
+static int lower_ref(struct lower_state *s, struct ast *r, struct retval *retval)
{
assert(r->k == AST_REF);
if (lower_expr(s, unop_expr(r), retval))
@@ -1012,19 +957,17 @@ static int lower_ref(struct lower_state *s, struct ast *r, struct vec *retval)
if (r->t->k == TYPE_STRUCT)
return 0;
- struct retval ret = retval_at(*retval, 0);
- char *ref = build_str("&%s", ret.s);
- free(ret.s);
- ret.s = ref;
- retval_at(*retval, 0) = ret;
+ char *ref = build_str("&%s", retval->s);
+ free(retval->s);
+ retval->s = ref;
return 0;
}
-static int lower_deref(struct lower_state *s, struct ast *d, struct vec *retval)
+static int lower_deref(struct lower_state *s, struct ast *d, struct retval *retval)
{
assert(d->k == AST_DEREF);
struct ast *expr = unop_expr(d);
- struct vec input = retval_create();
+ struct retval input = retval_create();
if (lower_expr(s, expr, &input)) {
retval_destroy(&input);
return -1;
@@ -1032,31 +975,33 @@ static int lower_deref(struct lower_state *s, struct ast *d, struct vec *retval)
assert(expr->t->k == TYPE_PTR);
char *name = build_str("deref_%zd", s->uniq++);
- char *base = (retval_at(input, 0)).s;
- char *type = is_small_type(expr->t) ? "i9" : "i27";
- printf("%s %s = << %s 0;\n", type, name, base);
+
+ /* structs are internally handled as pointers so don't do anything */
+ if (d->t->k != TYPE_STRUCT) {
+ char *base = input.s;
+ char *type = is_small_type(expr->t) ? "i9" : "i27";
+ printf("%s %s = << %s 0;\n", type, name, base);
+ }
+
retval_destroy(&input);
- struct retval r = build_retval(is_small_type(expr->t) ? REG_I9 : REG_I27, name);
- vect_append(struct retval, *retval, &r);
+ *retval = build_retval(is_small_type(expr->t) ? REG_I9 : REG_I27, name);
return 0;
}
-static int lower_dot(struct lower_state *s, struct ast *d, struct vec *retval)
+static int lower_dot(struct lower_state *s, struct ast *d, struct retval *retval)
{
assert(d->k == AST_DOT);
assert((dot_expr(d))->t->k == TYPE_STRUCT);
- struct vec input = retval_create();
- if (lower_expr(s, dot_expr(d), &input)) {
- retval_destroy(&input);
+ struct retval input;
+ if (lower_expr(s, dot_expr(d), &input))
return -1;
- }
struct type *type = d->t;
size_t off = type_offsetof((dot_expr(d))->t, dot_id(d));
char *name = build_str("dot_%zd", s->uniq++);
- char *base = (retval_at(input, 0)).s;
+ char *base = input.s;
struct retval r;
if (type->k == TYPE_STRUCT) {
@@ -1072,13 +1017,12 @@ static int lower_dot(struct lower_state *s, struct ast *d, struct vec *retval)
r = build_retval(is_small_type(type) ? REG_I9 : REG_I27, name);
}
- vec_append(retval, &r);
retval_destroy(&input);
+ *retval = r;
return 0;
}
-static int lower_expr(struct lower_state *s, struct ast *e,
- struct vec *retval)
+static int lower_expr(struct lower_state *s, struct ast *e, struct retval *retval)
{
if (!e)
return 0;
@@ -1155,7 +1099,7 @@ static int lower_block(struct lower_state *s, struct ast *block)
static int lower_statement(struct lower_state *s, struct ast *n)
{
- struct vec retval = retval_create();
+ struct retval retval = retval_create();
int ret = 0;
switch (n->k) {
generated by cgit v1.3 (git 2.53.0) at 2026-08-27 01:11:39 +0000