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quakeforge/tools/qfcc/source/def.c
Bill Currie caa297b756 [qfcc] Remove type alias encoding 
It proved to be too fragile in its current implementation. It broke
pointers to incomplete structs and switch enum checking, and getting it
to work for other things was overly invasive. I still want the encoding,
but need to come up with something more robust.a
2020-03-01 16:13:18 +09:00

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/*
def.c
def management and symbol tables
Copyright (C) 2002 Bill Currie <bill@taniwha.org>
Copyright (C) 1996-1997 Id Software, Inc.
Author: Bill Currie <bill@taniwha.org>
Date: 2002/06/09
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include "QF/alloc.h"
#include "QF/hash.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "qfcc.h"
#include "class.h"
#include "def.h"
#include "defspace.h"
#include "diagnostic.h"
#include "emit.h"
#include "expr.h"
#include "function.h"
#include "options.h"
#include "reloc.h"
#include "shared.h"
#include "strpool.h"
#include "struct.h"
#include "symtab.h"
#include "type.h"
#include "value.h"
static def_t *defs_freelist;
static void
set_storage_bits (def_t *def, storage_class_t storage)
{
switch (storage) {
case sc_system:
def->system = 1;
// fall through
case sc_global:
def->global = 1;
def->external = 0;
def->local = 0;
def->param = 0;
break;
case sc_extern:
def->global = 1;
def->external = 1;
def->local = 0;
def->param = 0;
break;
case sc_static:
def->external = 0;
def->global = 0;
def->local = 0;
def->param = 0;
break;
case sc_local:
def->external = 0;
def->global = 0;
def->local = 1;
def->param = 0;
break;
case sc_param:
def->external = 0;
def->global = 0;
def->local = 1;
def->param = 1;
break;
}
def->initialized = 0;
}
def_t *
new_def (const char *name, type_t *type, defspace_t *space,
storage_class_t storage)
{
def_t *def;
ALLOC (16384, def_t, defs, def);
def->return_addr = __builtin_return_address (0);
def->name = name ? save_string (name) : 0;
def->type = type;
def->file = pr.source_file;
def->line = pr.source_line;
set_storage_bits (def, storage);
if (space) {
if (space->type == ds_virtual && storage == sc_static)
internal_error (0, "static in a virtual space");
if (space->type != ds_virtual
&& (storage == sc_param || storage == sc_local))
internal_error (0, "param or local in a non-virtual space");
def->space = space;
*space->def_tail = def;
space->def_tail = &def->next;
}
if (!type)
return def;
if (!space && storage != sc_extern)
internal_error (0, "non-external def with no storage space");
if (obj_is_class (type)) {
error (0, "statically allocated instance of class %s",
type->t.class->name);
return def;
}
if (storage != sc_extern) {
int size = type_size (type);
int alignment = type->alignment;
if (!size) {
error (0, "%s has incomplete type", name);
size = 1;
alignment = 1;
}
if (alignment < 1) {
print_type (type);
internal_error (0, "temp type has no alignment");
}
def->offset = defspace_alloc_aligned_loc (space, size, alignment);
}
return def;
}
def_t *
alias_def (def_t *def, type_t *type, int offset)
{
def_t *alias;
if (def->alias) {
expr_t e;
e.file = def->file;
e.line = def->line;
internal_error (&e, "aliasing an alias def");
}
if (type_size (type) > type_size (def->type))
internal_error (0, "aliasing a def to a larger type");
if (offset < 0 || offset + type_size (type) > type_size (def->type))
internal_error (0, "invalid alias offset");
if (type == def->type)
return def;
for (alias = def->alias_defs; alias; alias = alias->next) {
if (alias->type == type && alias->offset == offset)
return alias;
}
ALLOC (16384, def_t, defs, alias);
alias->name = save_string (va ("[%s:%d]", def->name, offset));
alias->return_addr = __builtin_return_address (0);
alias->offset = offset;
alias->offset_reloc = 1;
alias->type = type;
alias->alias = def;
alias->line = pr.source_line;
alias->file = pr.source_file;
alias->next = def->alias_defs;
def->alias_defs = alias;
return alias;
}
def_t *
temp_def (type_t *type)
{
def_t *temp;
defspace_t *space = current_func->symtab->space;
int size = type_size (type);
int alignment = type->alignment;
if (size < 1 || size > 4) {
internal_error (0, "%d invalid size for temp def", size);
}
if (alignment < 1) {
internal_error (0, "temp type has no alignment");
}
if ((temp = current_func->temp_defs[size - 1])) {
current_func->temp_defs[size - 1] = temp->temp_next;
temp->temp_next = 0;
} else {
ALLOC (16384, def_t, defs, temp);
temp->offset = defspace_alloc_aligned_loc (space, size, alignment);
*space->def_tail = temp;
space->def_tail = &temp->next;
temp->name = save_string (va (".tmp%d", current_func->temp_num++));
}
temp->return_addr = __builtin_return_address (0);
temp->type = type;
temp->file = pr.source_file;
temp->line = pr.source_line;
set_storage_bits (temp, sc_local);
temp->space = space;
return temp;
}
void
free_temp_def (def_t *temp)
{
int size = type_size (temp->type) - 1;
temp->temp_next = current_func->temp_defs[size];
current_func->temp_defs[size] = temp;
}
void
free_def (def_t *def)
{
if (!def->return_addr)
internal_error (0, "double free of def");
if (def->alias) {
def_t **a;
// pull the alias out of the base def's list of alias defs to avoid
// messing up the list when the alias def is freed.
for (a = &def->alias->alias_defs; *a; a = &(*a)->next) {
if (*a == def) {
*a = def->next;
break;
}
}
} else if (def->space) {
def_t **d;
for (d = &def->space->defs; *d && *d != def; d = &(*d)->next)
;
if (!*d)
internal_error (0, "freeing unlinked def %s", def->name);
*d = def->next;
if (&def->next == def->space->def_tail)
def->space->def_tail = d;
if (!def->external)
defspace_free_loc (def->space, def->offset, type_size (def->type));
}
def->return_addr = 0;
def->free_addr = __builtin_return_address (0);
FREE (defs, def);
}
void
def_to_ddef (def_t *def, ddef_t *ddef, int aux)
{
type_t *type = def->type;
if (aux)
type = type->t.fldptr.type; // aux is true only for fields
ddef->type = type->type;
ddef->ofs = def->offset;
ddef->s_name = ReuseString (def->name);
}
static int
zero_memory (expr_t *local_expr, def_t *def, type_t *zero_type,
int init_size, int init_offset)
{
int zero_size = type_size (zero_type);
expr_t *zero = convert_nil (new_nil_expr (), zero_type);
expr_t *dst;
for (; init_offset < init_size + 1 - zero_size; init_offset += zero_size) {
dst = new_pointer_expr (init_offset, zero_type, def);
append_expr (local_expr, assign_expr (unary_expr ('.', dst), zero));
}
return init_offset;
}
static void
init_elements (struct def_s *def, expr_t *eles)
{
expr_t *e, *c;
int count, i, num_elements, base_offset;
pr_type_t *g;
def_t *elements;
base_offset = def->offset;
if (def->local && local_expr)
base_offset = 0;
if (eles->type == ex_nil) {
if (def->local && local_expr) {
// memset to 0
int init_size = type_size (def->type);
int init_offset = 0;
if (options.code.progsversion != PROG_ID_VERSION) {
init_offset = zero_memory (local_expr, def, &type_zero,
init_size, init_offset);
}
// probably won't happen any time soon, but who knows...
if (options.code.progsversion != PROG_ID_VERSION
&& init_size - init_offset >= type_size (&type_quaternion)) {
init_offset = zero_memory (local_expr, def, &type_quaternion,
init_size, init_offset);
}
if (init_size - init_offset >= type_size (&type_vector)) {
init_offset = zero_memory (local_expr, def, &type_vector,
init_size, init_offset);
}
if (options.code.progsversion != PROG_ID_VERSION
&& init_size - init_offset >= type_size (&type_double)) {
init_offset = zero_memory (local_expr, def, &type_double,
init_size, init_offset);
}
if (init_size - init_offset >= type_size (type_default)) {
zero_memory (local_expr, def, type_default,
init_size, init_offset);
}
}
// it's a global, so already initialized to 0
return;
}
if (is_array (def->type)) {
type_t *array_type = def->type->t.array.type;
int array_size = def->type->t.array.size;
elements = calloc (array_size, sizeof (def_t));
for (i = 0; i < array_size; i++) {
elements[i].type = array_type;
elements[i].space = def->space;
elements[i].offset = base_offset + i * type_size (array_type);
}
num_elements = i;
} else if (is_struct (def->type) || is_vector (def->type)
|| is_quaternion (def->type)) {
symtab_t *symtab = def->type->t.symtab;
symbol_t *field;
for (i = 0, field = symtab->symbols; field; field = field->next) {
if (field->sy_type != sy_var)
continue;
i++;
}
elements = calloc (i, sizeof (def_t));
for (i = 0, field = symtab->symbols; field; field = field->next) {
if (field->sy_type != sy_var)
continue;
elements[i].type = field->type;
elements[i].space = def->space;
elements[i].offset = base_offset + field->s.offset;
i++;
}
num_elements = i;
} else {
error (eles, "invalid initializer");
return;
}
for (count = 0, e = eles->e.block.head; e; count++, e = e->next) {
convert_name (e);
if (e->type == ex_nil && count < num_elements
&& !(is_array (elements[count].type)
|| is_struct (elements[count].type))) {
convert_nil (e, elements[count].type);
}
if (e->type == ex_error) {
free (elements);
return;
}
}
if (count > num_elements) {
if (options.warnings.initializer)
warning (eles, "excessive elements in initializer");
count = num_elements;
}
for (i = 0, e = eles->e.block.head; i < count; i++, e = e->next) {
g = D_POINTER (pr_type_t, &elements[i]);
c = constant_expr (e);
// nil will not survive as nil to this point if array or struct
if (c->type == ex_block || c->type == ex_nil) {
if (!is_array (elements[i].type)
&& !is_struct (elements[i].type)) {
error (e, "type mismatch in initializer");
continue;
}
init_elements (&elements[i], c);
continue;
} else if (c->type == ex_labelref) {
def_t loc;
loc.space = elements[i].space;
loc.offset = elements[i].offset;
reloc_def_op (c->e.labelref.label, &loc);
continue;
} else if (c->type == ex_value) {
if (c->e.value->lltype == ev_integer
&& elements[i].type->type == ev_float)
convert_int (c);
if (get_type (c) != elements[i].type) {
error (e, "type mismatch in initializer");
continue;
}
} else {
if (!def->local || !local_expr) {
error (e, "non-constant initializer");
continue;
}
}
if (def->local && local_expr) {
int offset = elements[i].offset;
type_t *type = elements[i].type;
expr_t *ptr = new_pointer_expr (offset, type, def);
append_expr (local_expr, assign_expr (unary_expr ('.', ptr), c));
} else {
if (c->type != ex_value)
internal_error (c, "bogus expression type in init_elements()");
if (c->e.value->lltype == ev_string) {
EMIT_STRING (def->space, g->string_var,
c->e.value->v.string_val);
} else {
memcpy (g, &c->e.value->v, type_size (get_type (c)) * 4);
}
}
}
free (elements);
}
static void
init_vector_components (symbol_t *vector_sym, int is_field)
{
expr_t *vector_expr;
int i;
static const char *fields[] = { "x", "y", "z" };
vector_expr = new_symbol_expr (vector_sym);
for (i = 0; i < 3; i++) {
expr_t *expr = 0;
symbol_t *sym;
const char *name;
name = va ("%s_%s", vector_sym->name, fields[i]);
sym = symtab_lookup (current_symtab, name);
if (sym) {
if (sym->table == current_symtab) {
if (sym->sy_type != sy_expr) {
error (0, "%s redefined", name);
sym = 0;
} else {
expr = sym->s.expr;
if (is_field) {
if (expr->type != ex_value
|| expr->e.value->lltype != ev_field) {
error (0, "%s redefined", name);
sym = 0;
} else {
expr->e.value->v.pointer.def = vector_sym->s.def;
expr->e.value->v.pointer.val = i;
}
}
}
} else {
sym = 0;
}
}
if (!sym)
sym = new_symbol (name);
if (!expr) {
if (is_field) {
expr = new_field_expr (i, &type_float, vector_sym->s.def);
} else {
expr = field_expr (vector_expr,
new_symbol_expr (new_symbol (fields[i])));
}
}
sym->sy_type = sy_expr;
sym->s.expr = expr;
if (!sym->table)
symtab_addsymbol (current_symtab, sym);
}
}
static void
init_field_def (def_t *def, expr_t *init, storage_class_t storage)
{
type_t *type = def->type->t.fldptr.type;
def_t *field_def;
symbol_t *field_sym;
reloc_t *relocs = 0;
if (!init) {
field_sym = symtab_lookup (pr.entity_fields, def->name);
if (!field_sym)
field_sym = new_symbol_type (def->name, type);
if (field_sym->s.def && field_sym->s.def->external) {
//FIXME this really is not the right way
relocs = field_sym->s.def->relocs;
free_def (field_sym->s.def);
field_sym->s.def = 0;
}
if (!field_sym->s.def) {
field_sym->s.def = new_def (def->name, type, pr.entity_data, storage);
reloc_attach_relocs (relocs, &field_sym->s.def->relocs);
field_sym->s.def->nosave = 1;
}
field_def = field_sym->s.def;
if (!field_sym->table)
symtab_addsymbol (pr.entity_fields, field_sym);
if (storage != sc_extern) {
D_INT (def) = field_def->offset;
reloc_def_field (field_def, def);
def->constant = 1;
def->nosave = 1;
}
// no support for initialized field vector componets (yet?)
if (type == &type_vector && options.code.vector_components)
init_vector_components (field_sym, 1);
} else if (init->type == ex_symbol) {
symbol_t *sym = init->e.symbol;
symbol_t *field = symtab_lookup (pr.entity_fields, sym->name);
if (field) {
expr_t *new = new_field_expr (0, field->type, field->s.def);
init->type = new->type;
init->e = new->e;
}
}
}
static int
num_elements (expr_t *e)
{
int count = 0;
for (e = e->e.block.head; e; e = e->next) {
count++;
}
return count;
}
void
initialize_def (symbol_t *sym, expr_t *init, defspace_t *space,
storage_class_t storage)
{
symbol_t *check = symtab_lookup (current_symtab, sym->name);
reloc_t *relocs = 0;
if (check && check->table == current_symtab) {
if (check->sy_type != sy_var || check->type != sym->type) {
error (0, "%s redefined", sym->name);
} else {
// is var and same type
if (!check->s.def)
internal_error (0, "half defined var");
if (storage == sc_extern) {
if (init)
warning (0, "initializing external variable");
return;
}
if (init && check->s.def->initialized) {
error (0, "%s redefined", sym->name);
return;
}
sym = check;
}
}
sym->sy_type = sy_var;
if (!sym->table)
symtab_addsymbol (current_symtab, sym);
if (sym->s.def && sym->s.def->external) {
//FIXME this really is not the right way
relocs = sym->s.def->relocs;
free_def (sym->s.def);
sym->s.def = 0;
}
if (!sym->s.def) {
if (is_array (sym->type) && !type_size (sym->type)
&& init->type == ex_block && !init->e.block.result) {
sym->type = array_type (sym->type->t.array.type,
num_elements (init));
}
sym->s.def = new_def (sym->name, sym->type, space, storage);
reloc_attach_relocs (relocs, &sym->s.def->relocs);
}
if (sym->type == &type_vector && options.code.vector_components)
init_vector_components (sym, 0);
if (sym->type->type == ev_field && storage != sc_local
&& storage != sc_param)
init_field_def (sym->s.def, init, storage);
if (storage == sc_extern) {
if (init)
warning (0, "initializing external variable");
return;
}
if (!init)
return;
convert_name (init);
if (init->type == ex_error)
return;
if ((is_array (sym->type) || is_struct (sym->type)
|| sym->type == &type_vector || sym->type == &type_quaternion)
&& ((init->type == ex_block && !init->e.block.result)
|| init->type == ex_nil)) {
init_elements (sym->s.def, init);
sym->s.def->initialized = 1;
} else {
type_t *init_type;
if (init->type == ex_nil) {
convert_nil (init, sym->type);
}
init_type = get_type (init);
if (!type_assignable (sym->type, init_type)) {
error (init, "type mismatch in initializer");
return;
}
if (local_expr) {
sym->s.def->initialized = 1;
init = assign_expr (new_symbol_expr (sym), init);
// fold_constants takes care of int/float conversions
append_expr (local_expr, fold_constants (init));
} else {
int offset = 0;
if (!is_constant (init)) {
error (init, "non-constant initializier");
return;
}
while ((init->type == ex_uexpr || init->type == ex_expr)
&& init->e.expr.op == 'A') {
if (init->type == ex_expr) {
offset += expr_integer (init->e.expr.e2);
}
init = init->e.expr.e1;
}
if (init->type != ex_value) { //FIXME enum etc
internal_error (0, "initializier not a value");
return;
}
if (init->e.value->lltype == ev_pointer
|| init->e.value->lltype == ev_field) {
// FIXME offset pointers
D_INT (sym->s.def) = init->e.value->v.pointer.val;
if (init->e.value->v.pointer.def)
reloc_def_field (init->e.value->v.pointer.def, sym->s.def);
} else {
ex_value_t *v = init->e.value;
if (!init->implicit
&& is_double (init_type)
&& (is_integral (sym->type) || is_float (sym->type))) {
warning (init, "assigning double to %s in initializer "
"(use a cast)", sym->type->name);
}
if (is_scalar (sym->type))
v = convert_value (v, sym->type);
if (v->lltype == ev_string) {
EMIT_STRING (sym->s.def->space, D_STRING (sym->s.def),
v->v.string_val);
} else {
memcpy (D_POINTER (void, sym->s.def), &v->v,
type_size (sym->type) * sizeof (pr_type_t));
}
}
sym->s.def->initialized = 1;
if (options.code.const_initializers) {
sym->s.def->constant = 1;
sym->s.def->nosave = 1;
}
}
}
sym->s.def->initializer = init;
}
int
def_overlap (def_t *d1, def_t *d2)
{
int offs1, size1;
int offs2, size2;
defspace_t *s1 = d1->space;
defspace_t *s2 = d2->space;
if (d1->alias)
s1 = d1->alias->space;
if (d2->alias)
s2 = d2->alias->space;
/// Defs in different spaces never overlap.
if (s1 != s2)
return 0;
offs1 = d1->offset;
if (d1->alias)
offs1 += d1->alias->offset;
size1 = type_size (d1->type);
offs2 = d2->offset;
if (d2->alias)
offs2 += d2->alias->offset;
size2 = type_size (d2->type);
if (offs1 <= offs2 && offs1 + size1 >= offs2 + size2)
return 2; // d1 fully overlaps d2
if (offs1 < offs2 + size2 && offs2 < offs1 + size1)
return 1; // d1 and d2 at least partially overlap
return 0;
}
int
def_offset (def_t *def)
{
int offset = def->offset;
if (def->alias)
offset += def->alias->offset;
return offset;
}
int
def_size (def_t *def)
{
return type_size (def->type);
}
int
def_visit_all (def_t *def, int overlap,
int (*visit) (def_t *, void *), void *data)
{
def_t *start_def = def;
int ret;
if ((ret = visit (def, data)))
return ret;
if (def->alias) {
def = def->alias;
if ((ret = visit (def, data)))
return ret;
}
for (def = def->alias_defs; def; def = def->next) {
if (def == start_def)
continue;
if (overlap && def_overlap (def, start_def) < overlap)
continue;
if ((ret = visit (def, data)))
return ret;
}
return 0;
}
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