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author | Gaming4JC <g4jc@hyperbola.info> | 2019-12-13 20:59:32 -0500 |
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committer | Gaming4JC <g4jc@hyperbola.info> | 2019-12-17 06:25:25 -0500 |
commit | d0d9a4f43dbd58c694c706b17996157fede20bdf (patch) | |
tree | db9e4dce1b1c92b477720f1eba9a9ec04b3f8e2d /js/src/vm | |
parent | 79b5eb14bc5f8495d20147957cda5f4e5fc8186a (diff) | |
download | UXP-d0d9a4f43dbd58c694c706b17996157fede20bdf.tar UXP-d0d9a4f43dbd58c694c706b17996157fede20bdf.tar.gz UXP-d0d9a4f43dbd58c694c706b17996157fede20bdf.tar.lz UXP-d0d9a4f43dbd58c694c706b17996157fede20bdf.tar.xz UXP-d0d9a4f43dbd58c694c706b17996157fede20bdf.zip |
Bug 1316098 - Optimize out result object allocation for await/return in async function.
Tag #1287
Diffstat (limited to 'js/src/vm')
-rw-r--r-- | js/src/vm/AsyncFunction.cpp | 24 | ||||
-rw-r--r-- | js/src/vm/AsyncFunction.h | 3 | ||||
-rw-r--r-- | js/src/vm/Debugger.cpp | 12 | ||||
-rw-r--r-- | js/src/vm/Opcodes.h | 6 |
4 files changed, 11 insertions, 34 deletions
diff --git a/js/src/vm/AsyncFunction.cpp b/js/src/vm/AsyncFunction.cpp index be7a36ecc..2bcec5465 100644 --- a/js/src/vm/AsyncFunction.cpp +++ b/js/src/vm/AsyncFunction.cpp @@ -171,22 +171,14 @@ AsyncFunctionResume(JSContext* cx, Handle<PromiseObject*> resultPromise, HandleV : cx->names().StarGeneratorThrow; FixedInvokeArgs<1> args(cx); args[0].set(valueOrReason); - RootedValue result(cx); - if (!CallSelfHostedFunction(cx, funName, generatorVal, args, &result)) - return AsyncFunctionThrown(cx, resultPromise); - - RootedObject resultObj(cx, &result.toObject()); - RootedValue doneVal(cx); RootedValue value(cx); - if (!GetProperty(cx, resultObj, resultObj, cx->names().done, &doneVal)) - return false; - if (!GetProperty(cx, resultObj, resultObj, cx->names().value, &value)) - return false; + if (!CallSelfHostedFunction(cx, funName, generatorVal, args, &value)) + return AsyncFunctionThrown(cx, resultPromise); - if (doneVal.toBoolean()) - return AsyncFunctionReturned(cx, resultPromise, value); + if (generatorVal.toObject().as<GeneratorObject>().isAfterAwait()) + return AsyncFunctionAwait(cx, resultPromise, value); - return AsyncFunctionAwait(cx, resultPromise, value); + return AsyncFunctionReturned(cx, resultPromise, value); } // Async Functions proposal 2.2 steps 3-8. @@ -242,9 +234,3 @@ js::IsWrappedAsyncFunction(JSFunction* fun) { return fun->maybeNative() == WrappedAsyncFunction; } - -MOZ_MUST_USE bool -js::CheckAsyncResumptionValue(JSContext* cx, HandleValue v) -{ - return CheckStarGeneratorResumptionValue(cx, v); -} diff --git a/js/src/vm/AsyncFunction.h b/js/src/vm/AsyncFunction.h index d7f2c1311..de7c87d13 100644 --- a/js/src/vm/AsyncFunction.h +++ b/js/src/vm/AsyncFunction.h @@ -35,9 +35,6 @@ MOZ_MUST_USE bool AsyncFunctionAwaitedRejected(JSContext* cx, Handle<PromiseObject*> resultPromise, HandleValue generatorVal, HandleValue reason); -MOZ_MUST_USE bool -CheckAsyncResumptionValue(JSContext* cx, HandleValue v); - } // namespace js #endif /* vm_AsyncFunction_h */ diff --git a/js/src/vm/Debugger.cpp b/js/src/vm/Debugger.cpp index 7c09c50b0..2680699a4 100644 --- a/js/src/vm/Debugger.cpp +++ b/js/src/vm/Debugger.cpp @@ -32,7 +32,6 @@ #include "js/Vector.h" #include "proxy/ScriptedProxyHandler.h" #include "vm/ArgumentsObject.h" -#include "vm/AsyncFunction.h" #include "vm/DebuggerMemory.h" #include "vm/GeneratorObject.h" #include "vm/SPSProfiler.h" @@ -1560,16 +1559,11 @@ CheckResumptionValue(JSContext* cx, AbstractFramePtr frame, const Maybe<HandleVa JSTrapStatus status, MutableHandleValue vp) { if (status == JSTRAP_RETURN && frame && frame.isFunctionFrame()) { - // Don't let a { return: ... } resumption value make a generator or - // async function violate the iterator protocol. The return value from + // Don't let a { return: ... } resumption value make a generator + // function violate the iterator protocol. The return value from // such a frame must have the form { done: <bool>, value: <anything> }. RootedFunction callee(cx, frame.callee()); - if (callee->isAsync()) { - if (!CheckAsyncResumptionValue(cx, vp)) { - JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_BAD_AWAIT); - return false; - } - } else if (callee->isStarGenerator() || callee->isAsync()) { + if (callee->isStarGenerator()) { if (!CheckStarGeneratorResumptionValue(cx, vp)) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_BAD_YIELD); return false; diff --git a/js/src/vm/Opcodes.h b/js/src/vm/Opcodes.h index b44628080..583d32beb 100644 --- a/js/src/vm/Opcodes.h +++ b/js/src/vm/Opcodes.h @@ -2120,12 +2120,12 @@ */ \ macro(JSOP_DEBUGAFTERYIELD, 208, "debugafteryield", NULL, 1, 0, 0, JOF_BYTE) \ /* - * Pops the generator and the return value 'result', stops interpretation - * and returns 'result'. Pushes resolved value onto the stack. + * Pops the generator and the return value 'promise', stops interpretation + * and returns 'promise'. Pushes resolved value onto the stack. * Category: Statements * Type: Generator * Operands: uint24_t yieldAndAwaitIndex - * Stack: result, gen => resolved + * Stack: promise, gen => resolved */ \ macro(JSOP_AWAIT, 209, "await", NULL, 4, 2, 1, JOF_UINT24) \ macro(JSOP_UNUSED210, 210, "unused210", NULL, 1, 0, 0, JOF_BYTE) \ |