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Support nil maps. 

From-SVN: r179054
This commit is contained in:
Ian Lance Taylor 2011-09-21 17:37:50 +00:00
parent bd352290bc
commit e6f8e59016
5 changed files with 27 additions and 12 deletions
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4
gcc/go/gofrontend/runtime.def
View File

@ -87,8 +87,8 @@ DEF_GO_RUNTIME(MAP_INDEX, "__go_map_index", P3(MAP, POINTER, BOOL),
R1(POINTER))
// Look up a key in a map returning whether it is present.
DEF_GO_RUNTIME(MAPACCESS2, "runtime.mapaccess2", P3(MAP, POINTER, POINTER),
R1(BOOL))
DEF_GO_RUNTIME(MAPACCESS2, "runtime.mapaccess2",
P4(TYPE, MAP, POINTER, POINTER), R1(BOOL))
// Tuple assignment to a map element.
DEF_GO_RUNTIME(MAPASSIGN2, "runtime.mapassign2",

12
gcc/go/gofrontend/statements.cc
View File

@ -1085,14 +1085,16 @@ Tuple_map_assignment_statement::do_lower(Gogo*, Named_object*,
Statement::make_temporary(Type::lookup_bool_type(), NULL, loc);
b->add_statement(present_temp);
// present_temp = mapaccess2(MAP, &key_temp, &val_temp)
// present_temp = mapaccess2(DESCRIPTOR, MAP, &key_temp, &val_temp)
Expression* a1 = Expression::make_type_descriptor(map_type, loc);
Expression* a2 = map_index->map();
Temporary_reference_expression* ref =
Expression::make_temporary_reference(key_temp, loc);
Expression* a1 = Expression::make_unary(OPERATOR_AND, ref, loc);
Expression* a3 = Expression::make_unary(OPERATOR_AND, ref, loc);
ref = Expression::make_temporary_reference(val_temp, loc);
Expression* a2 = Expression::make_unary(OPERATOR_AND, ref, loc);
Expression* call = Runtime::make_call(Runtime::MAPACCESS2, loc, 3,
map_index->map(), a1, a2);
Expression* a4 = Expression::make_unary(OPERATOR_AND, ref, loc);
Expression* call = Runtime::make_call(Runtime::MAPACCESS2, loc, 4,
a1, a2, a3, a4);
ref = Expression::make_temporary_reference(present_temp, loc);
ref->set_is_lvalue();

4
libgo/runtime/go-map-delete.c
View File

@ -9,6 +9,7 @@
#include "go-alloc.h"
#include "go-assert.h"
#include "go-panic.h"
#include "map.h"
/* Delete the entry matching KEY from MAP. */
@ -25,6 +26,9 @@ __go_map_delete (struct __go_map *map, const void *key)
size_t bucket_index;
void **pentry;
if (map == NULL)
__go_panic_msg ("assignment to entry in nil map");
descriptor = map->__descriptor;
key_descriptor = descriptor->__map_descriptor->__key_type;

8
libgo/runtime/go-map-index.c
View File

@ -9,6 +9,7 @@
#include "go-alloc.h"
#include "go-assert.h"
#include "go-panic.h"
#include "map.h"
/* Rehash MAP to a larger size. */
@ -85,6 +86,13 @@ __go_map_index (struct __go_map *map, const void *key, _Bool insert)
size_t bucket_index;
char *entry;
if (map == NULL)
{
if (insert)
__go_panic_msg ("assignment to entry in nil map");
return NULL;
}
descriptor = map->__descriptor;
key_descriptor = descriptor->__map_descriptor->__key_type;

11
libgo/runtime/map.goc
View File

@ -9,17 +9,18 @@ package runtime
typedef unsigned char byte;
typedef _Bool bool;
typedef struct __go_map hmap;
typedef struct __go_map_type MapType;
typedef struct __go_map Hmap;
typedef struct __go_hash_iter hiter;
/* Access a value in a map, returning a value and a presence indicator. */
func mapaccess2(h *hmap, key *byte, val *byte) (present bool) {
func mapaccess2(t *MapType, h *Hmap, key *byte, val *byte) (present bool) {
byte *mapval;
size_t valsize;
mapval = __go_map_index(h, key, 0);
valsize = h->__descriptor->__map_descriptor->__val_type->__size;
valsize = t->__val_type->__size;
if (mapval == nil) {
__builtin_memset(val, 0, valsize);
present = 0;
@ -31,7 +32,7 @@ func mapaccess2(h *hmap, key *byte, val *byte) (present bool) {
/* Optionally assign a value to a map (m[k] = v, p). */
func mapassign2(h *hmap, key *byte, val *byte, p bool) {
func mapassign2(h *Hmap, key *byte, val *byte, p bool) {
if (!p) {
__go_map_delete(h, key);
} else {
@ -46,7 +47,7 @@ func mapassign2(h *hmap, key *byte, val *byte, p bool) {
/* Initialize a range over a map. */
func mapiterinit(h *hmap, it *hiter) {
func mapiterinit(h *Hmap, it *hiter) {
__go_mapiterinit(h, it);
}