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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| typedef unsigned long __jmp_buf[8]; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /* | ||
| * a runtime implementation for | ||
| * https://github.com/llvm/llvm-project/pull/84137 | ||
| * https://docs.google.com/document/d/1ZvTPT36K5jjiedF8MCXbEmYjULJjI723aOAks1IdLLg/edit | ||
| */ | ||
|
|
||
| #include <stddef.h> | ||
| #include <stdint.h> | ||
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|
||
| /* | ||
| * function prototypes | ||
| */ | ||
| void __wasm_setjmp(void *env, uint32_t label, void *func_invocation_id); | ||
| uint32_t __wasm_setjmp_test(void *env, void *func_invocation_id); | ||
| void __wasm_longjmp(void *env, int val); | ||
|
|
||
| /* | ||
| * jmp_buf should have large enough size and alignment to contain | ||
| * this structure. | ||
| */ | ||
| struct jmp_buf_impl { | ||
| void *func_invocation_id; | ||
| uint32_t label; | ||
|
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||
| /* | ||
| * this is a temorary storage used by the communication between | ||
| * __wasm_sjlj_longjmp and WebAssemblyLowerEmscriptenEHSjL-generated | ||
| * logic. | ||
| * ideally, this can be replaced with multivalue. | ||
| */ | ||
| struct arg { | ||
| void *env; | ||
| int val; | ||
| } arg; | ||
| }; | ||
|
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| void | ||
| __wasm_setjmp(void *env, uint32_t label, void *func_invocation_id) | ||
| { | ||
| struct jmp_buf_impl *jb = env; | ||
| if (label == 0) { /* ABI contract */ | ||
| __builtin_trap(); | ||
| } | ||
| if (func_invocation_id == NULL) { /* sanity check */ | ||
| __builtin_trap(); | ||
| } | ||
| jb->func_invocation_id = func_invocation_id; | ||
| jb->label = label; | ||
| } | ||
|
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||
| uint32_t | ||
| __wasm_setjmp_test(void *env, void *func_invocation_id) | ||
| { | ||
| struct jmp_buf_impl *jb = env; | ||
| if (jb->label == 0) { /* ABI contract */ | ||
| __builtin_trap(); | ||
| } | ||
| if (func_invocation_id == NULL) { /* sanity check */ | ||
| __builtin_trap(); | ||
| } | ||
| if (jb->func_invocation_id == func_invocation_id) { | ||
| return jb->label; | ||
| } | ||
| return 0; | ||
| } | ||
|
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||
| void | ||
| __wasm_longjmp(void *env, int val) | ||
| { | ||
| struct jmp_buf_impl *jb = env; | ||
| struct arg *arg = &jb->arg; | ||
| /* | ||
| * C standard says: | ||
| * The longjmp function cannot cause the setjmp macro to return | ||
| * the value 0; if val is 0, the setjmp macro returns the value 1. | ||
| */ | ||
| if (val == 0) { | ||
| val = 1; | ||
| } | ||
| arg->env = env; | ||
| arg->val = val; | ||
| __builtin_wasm_throw(1, arg); /* 1 == C_LONGJMP */ | ||
| } | ||
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Ideally we should copy the content of this into the tool-conventions repo. Would you be interested in doing this, or would you mind if I did it?
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i agree we should document in the tool-conventions repo.
i think i can write something next month.
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i wrote something. WebAssembly/tool-conventions#225