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/*
* 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
*
*
* 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 WASM_RT_THREAD_LOCAL wasm_rt_jmp_buf g_wasm_rt_jmp_buf;
#if WASM_RT_USE_STACK_DEPTH_COUNT
/** Saved call stack depth that will be restored in case a trap occurs. */
extern WASM_RT_THREAD_LOCAL 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(&g_wasm_rt_jmp_buf), \
WASM_RT_SETJMP(g_wasm_rt_jmp_buf))
#ifdef __cplusplus
}
#endif
#endif /* WASM_RT_IMPL_H_ */