73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
|
|
* Copyright 2018 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_RT_IMPL_H_
|
|
#define WASM_RT_IMPL_H_
|
|
|
|
#include "wasm-rt.h"
|
|
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** A setjmp buffer used for handling traps. */
|
|
extern jmp_buf wasm_rt_jmp_buf;
|
|
|
|
#if WASM_RT_MEMCHECK_SIGNAL_HANDLER && !defined(_WIN32)
|
|
#define WASM_RT_LONGJMP(buf, val) siglongjmp(buf, val)
|
|
#else
|
|
#define WASM_RT_LONGJMP(buf, val) longjmp(buf, val)
|
|
#endif
|
|
|
|
#if WASM_RT_USE_STACK_DEPTH_COUNT
|
|
/** Saved call stack depth that will be restored in case a trap occurs. */
|
|
extern uint32_t wasm_rt_saved_call_stack_depth;
|
|
#define WASM_RT_SAVE_STACK_DEPTH() \
|
|
wasm_rt_saved_call_stack_depth = wasm_rt_call_stack_depth
|
|
#else
|
|
#define WASM_RT_SAVE_STACK_DEPTH() (void)0
|
|
#endif
|
|
|
|
/**
|
|
* Convenience macro to use before calling a wasm function. On first execution
|
|
* it will return `WASM_RT_TRAP_NONE` (i.e. 0). If the function traps, it will
|
|
* jump back and return the trap that occurred.
|
|
*
|
|
* ```
|
|
* wasm_rt_trap_t code = wasm_rt_impl_try();
|
|
* if (code != 0) {
|
|
* printf("A trap occurred with code: %d\n", code);
|
|
* ...
|
|
* }
|
|
*
|
|
* // Call the potentially-trapping function.
|
|
* my_wasm_func();
|
|
* ```
|
|
*/
|
|
#define wasm_rt_impl_try() \
|
|
(WASM_RT_SAVE_STACK_DEPTH(), wasm_rt_set_unwind_target(&wasm_rt_jmp_buf), \
|
|
WASM_RT_SETJMP(wasm_rt_jmp_buf))
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* WASM_RT_IMPL_H_ */
|