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Update wasm-rt-impl.h #2531

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20 changes: 20 additions & 0 deletions wasm2c/wasm-rt-impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,26 @@ extern WASM_RT_THREAD_LOCAL uint32_t wasm_rt_saved_call_stack_depth;
* // Call the potentially-trapping function.
* my_wasm_func();
* ```
*
* This macro depends on definitions from `wasm-rt-impl.h`, e.g.:
* ```
* ...
* #include "wasm-rt-exceptions.h"
* ...
* ```
*
* In case the exception extension is not available one can use wasm_rt_try
* like in this example:
*
* ```
* wasm_rt_trap_t code = wasm_rt_try(g_wasm_rt_jmp_buf);
* if (WASM_RT_TRAP_NONE == code) {
* w2c_0x24empty(&my_module);
* }
* else {
* printf("%s\n", wasm_rt_strerror(code));
* }
* ```
*/
#define wasm_rt_impl_try() \
(WASM_RT_SAVE_STACK_DEPTH(), wasm_rt_set_unwind_target(&g_wasm_rt_jmp_buf), \
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