setjmp support #490
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The current plan is to wait for the exception-handling proposal to be standardized and implemented in wasm engines, and then to implement Another option would be to define a host API which performs stack unwinding. We've so far not pursued this approach, because that would be a lot of complex work for non-JS host API implementors, for what would ultimately be a temporary workaround. And, such an API would not be virtualizable, and would raise complex questions about non-C-language unwinding which the exception-handling proposal already has answers for. |
This commit explores using the wasmenv toolkit to compile PHP. The configure phase works, but the make fails because setjmp is unsupported yet, see the error message below and the relevant GitHub issue at WebAssembly/WASI#490 There's a chance "make" would work if we tried a dedicated libc build: https://github.com/WebAssembly/wasi-libc/blob/main/libc-top-half/musl/include/setjmp.h I'm not sure if the final PHP build would be functional, though. Either way, building using wasi-sdk which has libc and set_jmp.h baked in would be a sensible next step: https://github.com/WebAssembly/wasi-sdk/releases 31 69.49 /root/php-src/main/setjmp.h:44:2: warning: setjmp is not yet implemented for WASI [-W#warnings] 31 69.49 #warning setjmp is not yet implemented for WASI 31 69.49 ^ 31 69.56 In file included from /root/php-src/ext/bcmath/libbcmath/src/div.c:32: 31 69.56 In file included from /root/php-src/ext/bcmath/libbcmath/src/config.h:7: 31 69.56 In file included from /root/php-src/main/php.h:35: 31 69.56 In file included from /root/php-src/Zend/zend_API.h:25: 31 69.56 In file included from /root/php-src/Zend/zend_modules.h:24: 31 69.56 In file included from /root/php-src/Zend/zend_compile.h:724: 31 69.56 /root/php-src/Zend/zend_globals.h:151:2: error: unknown type name 'jmp_buf' 31 69.56 JMP_BUF *bailout; 31 69.56 ^ 31 69.56 /root/php-src/Zend/zend_portability.h:361:18: note: expanded from macro 'JMP_BUF' 31 69.56 # define JMP_BUF jmp_buf
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The original question is answered; please file new issues for any further questions! |
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@sunfishcode According to WebAssembly/exception-handling#179, it seems that most browsers have completed the implementation. It's in Phase 3, but since the implementation has been completed, would it be okay to provide support for it? |
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Yes, an implementation is now merged into wasi-libc in WebAssembly/wasi-libc#483. |
current sdk
./share/wasi-sysroot/include/c++/v1/setjmp.his not working.please share the roadmap for this sdk to support setjmp, I want use it in https://github.com/protocolbuffers/upb
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