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/*
* Copyright 2016 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef WASM_ALLOCATOR_H_
#define WASM_ALLOCATOR_H_
#include <stdlib.h>
#include <string.h>
#include "wasm-common.h"
#define WASM_DEFAULT_ALIGN sizeof(void*)
typedef void* WasmAllocatorMark;
typedef struct WasmAllocator {
void* (*alloc)(struct WasmAllocator*,
size_t size,
size_t align,
const char* file,
int line);
void* (*realloc)(struct WasmAllocator*,
void* p,
size_t size,
size_t align,
const char* file,
int line);
void (*free)(struct WasmAllocator*, void* p, const char* file, int line);
/* destroy the allocator */
void (*destroy)(struct WasmAllocator*);
/* mark/reset_to_mark are only supported by the stack allocator */
WasmAllocatorMark (*mark)(struct WasmAllocator*);
void (*reset_to_mark)(struct WasmAllocator*, WasmAllocatorMark);
void (*print_stats)(struct WasmAllocator*);
} WasmAllocator;
extern WasmAllocator g_wasm_libc_allocator;
#define wasm_alloc(allocator, size, align) \
(allocator)->alloc((allocator), (size), (align), __FILE__, __LINE__)
#define wasm_alloc_zero(allocator, size, align) \
wasm_alloc_zero_((allocator), (size), (align), __FILE__, __LINE__)
#define wasm_realloc(allocator, p, size, align) \
(allocator)->realloc((allocator), (p), (size), (align), __FILE__, __LINE__)
#define wasm_free(allocator, p) \
(allocator)->free((allocator), (p), __FILE__, __LINE__)
#define wasm_destroy_allocator(allocator) (allocator)->destroy(allocator)
#define wasm_mark(allocator) (allocator)->mark(allocator)
#define wasm_reset_to_mark(allocator, mark) \
(allocator)->reset_to_mark(allocator, mark)
#define wasm_print_allocator_stats(allocator) \
(allocator)->print_stats(allocator)
#define wasm_strndup(allocator, s, len) \
wasm_strndup_(allocator, s, len, __FILE__, __LINE__)
#define wasm_dup_string_slice(allocator, str) \
wasm_dup_string_slice_(allocator, str, __FILE__, __LINE__)
WASM_EXTERN_C_BEGIN
static WASM_INLINE void* wasm_alloc_zero_(WasmAllocator* allocator,
size_t size,
size_t align,
const char* file,
int line) {
void* result = allocator->alloc(allocator, size, align, file, line);
if (!result)
return NULL;
memset(result, 0, size);
return result;
}
static WASM_INLINE char* wasm_strndup_(WasmAllocator* allocator,
const char* s,
size_t len,
const char* file,
int line) {
size_t real_len = 0;
const char* p = s;
while (real_len < len && *p) {
p++;
real_len++;
}
char* new_s = allocator->alloc(allocator, real_len + 1, 1, file, line);
if (!new_s)
return NULL;
memcpy(new_s, s, real_len);
new_s[real_len] = 0;
return new_s;
}
static WASM_INLINE WasmStringSlice
wasm_dup_string_slice_(WasmAllocator* allocator,
WasmStringSlice str,
const char* file,
int line) {
WasmStringSlice result;
result.start = wasm_strndup_(allocator, str.start, str.length, file, line);
result.length = str.length;
return result;
}
WASM_EXTERN_C_END
#endif /* WASM_ALLOCATOR_H_ */
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