diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/passes/Asyncify.cpp | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/src/passes/Asyncify.cpp b/src/passes/Asyncify.cpp index a4ff5794b..c1cec4a36 100644 --- a/src/passes/Asyncify.cpp +++ b/src/passes/Asyncify.cpp @@ -127,7 +127,7 @@ // proper place, and the end to the proper end based on how much memory // you reserved. Note that asyncify will grow the stack up. // -// The pass will also create four functions that let you control unwinding +// The pass will also create five functions that let you control unwinding // and rewinding: // // * asyncify_start_unwind(data : i32): call this to start unwinding the @@ -150,6 +150,12 @@ // * asyncify_stop_rewind(): call this to note that rewinding has // concluded, and normal execution can resume. // +// * asyncify_get_state(): call this to get the current value of the +// internal "__asyncify_state" variable as described above. +// It can be used to distinguish between unwinding/rewinding and normal +// calls, so that you know when to start an asynchronous operation and +// when to propagate results back. +// // These four functions are exported so that you can call them from the // outside. If you want to manage things from inside the wasm, then you // couldn't have called them before they were created by this pass. To work @@ -269,6 +275,7 @@ namespace wasm { namespace { static const Name ASYNCIFY_STATE = "__asyncify_state"; +static const Name ASYNCIFY_GET_STATE = "asyncify_get_state"; static const Name ASYNCIFY_DATA = "__asyncify_data"; static const Name ASYNCIFY_START_UNWIND = "asyncify_start_unwind"; static const Name ASYNCIFY_STOP_UNWIND = "asyncify_stop_unwind"; @@ -1336,6 +1343,14 @@ private: makeFunction(ASYNCIFY_STOP_UNWIND, false, State::Normal); makeFunction(ASYNCIFY_START_REWIND, true, State::Rewinding); makeFunction(ASYNCIFY_STOP_REWIND, false, State::Normal); + + module->addFunction( + builder.makeFunction(ASYNCIFY_GET_STATE, + Signature(Type::none, Type::i32), + {}, + builder.makeGlobalGet(ASYNCIFY_STATE, Type::i32))); + module->addExport(builder.makeExport( + ASYNCIFY_GET_STATE, ASYNCIFY_GET_STATE, ExternalKind::Function)); } }; |