mirror of
https://github.com/remko/waforth
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56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/*
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* Copyright 2018 WebAssembly Community Group participants
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef WASM_RT_IMPL_H_
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#define WASM_RT_IMPL_H_
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#include <setjmp.h>
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#include "wasm-rt.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** A setjmp buffer used for handling traps. */
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extern jmp_buf g_jmp_buf;
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/** Saved call stack depth that will be restored in case a trap occurs. */
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extern uint32_t g_saved_call_stack_depth;
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/** Convenience macro to use before calling a wasm function. On first execution
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* it will return `WASM_RT_TRAP_NONE` (i.e. 0). If the function traps, it will
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* jump back and return the trap that occurred.
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*
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* ```
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* wasm_rt_trap_t code = wasm_rt_impl_try();
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* if (code != 0) {
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* printf("A trap occurred with code: %d\n", code);
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* ...
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* }
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*
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* // Call the potentially-trapping function.
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* my_wasm_func();
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* ```
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*/
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#define wasm_rt_impl_try() \
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(g_saved_call_stack_depth = wasm_rt_call_stack_depth, setjmp(g_jmp_buf))
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#ifdef __cplusplus
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}
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#endif
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#endif // WASM_RT_IMPL_H_
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