github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libgo/runtime/map.goc (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package runtime
     6  #include "runtime.h"
     7  #include "map.h"
     8  
     9  typedef struct __go_map Hmap;
    10  typedef struct __go_hash_iter hiter;
    11  
    12  /* Access a value in a map, returning a value and a presence indicator.  */
    13  
    14  func mapaccess2(t *MapType, h *Hmap, key *byte, val *byte) (present bool) {
    15  	byte *mapval;
    16  	size_t valsize;
    17  
    18  	mapval = __go_map_index(h, key, 0);
    19  	valsize = t->__val_type->__size;
    20  	if (mapval == nil) {
    21  		__builtin_memset(val, 0, valsize);
    22  		present = 0;
    23  	} else {
    24  		__builtin_memcpy(val, mapval, valsize);
    25  		present = 1;
    26  	}
    27  }
    28  
    29  /* Optionally assign a value to a map (m[k] = v, p).  */
    30  
    31  func mapassign2(h *Hmap, key *byte, val *byte, p bool) {
    32  	if (!p) {
    33  		__go_map_delete(h, key);
    34  	} else {
    35  		byte *mapval;
    36  		size_t valsize;
    37  
    38  		mapval = __go_map_index(h, key, 1);
    39  		valsize = h->__descriptor->__map_descriptor->__val_type->__size;
    40  		__builtin_memcpy(mapval, val, valsize);
    41  	}
    42  }
    43  
    44  /* Delete a key from a map.  */
    45  
    46  func mapdelete(h *Hmap, key *byte) {
    47  	__go_map_delete(h, key);
    48  }
    49  
    50  /* Initialize a range over a map.  */
    51  
    52  func mapiterinit(h *Hmap, it *hiter) {
    53  	__go_mapiterinit(h, it);
    54  }
    55  
    56  /* Move to the next iteration, updating *HITER.  */
    57  
    58  func mapiternext(it *hiter) {
    59  	__go_mapiternext(it);
    60  }
    61  
    62  /* Get the key of the current iteration.  */
    63  
    64  func mapiter1(it *hiter, key *byte) {
    65  	__go_mapiter1(it, key);
    66  }
    67  
    68  /* Get the key and value of the current iteration.  */
    69  
    70  func mapiter2(it *hiter, key *byte, val *byte) {
    71  	__go_mapiter2(it, key, val);
    72  }