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Bug 1343481 - Part 4: Add Add GeneratorObject.{isAfterYield,isAfterAwait}.

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Tag #1287
This commit is contained in:
Gaming4JC 2019-12-03 17:34:06 -05:00 • committed by Roy Tam
commit bc80cb0d51
2 changed files with 38 additions and 0 deletions
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31
js/src/vm/GeneratorObject.cpp
View file

@ -370,3 +370,34 @@ js::CheckStarGeneratorResumptionValue(JSContext* cx, HandleValue v)
return true; return true;
} }
bool
GeneratorObject::isAfterYield()
{
return isAfterYieldOrAwait(JSOP_YIELD);
}
bool
GeneratorObject::isAfterAwait()
{
return isAfterYieldOrAwait(JSOP_AWAIT);
}
bool
GeneratorObject::isAfterYieldOrAwait(JSOp op)
{
if (isClosed() || isClosing() || isRunning())
return false;
JSScript* script = callee().nonLazyScript();
jsbytecode* code = script->code();
uint32_t nextOffset = script->yieldAndAwaitOffsets()[yieldAndAwaitIndex()];
if (code[nextOffset] != JSOP_DEBUGAFTERYIELD)
return false;
uint32_t offset = nextOffset - JSOP_YIELD_LENGTH;
MOZ_ASSERT(code[offset] == JSOP_INITIALYIELD || code[offset] == JSOP_YIELD ||
code[offset] == JSOP_AWAIT);
return code[offset] == op;
}

7
js/src/vm/GeneratorObject.h
View file

@ -179,6 +179,13 @@ class GeneratorObject : public NativeObject
setFixedSlot(NEWTARGET_SLOT, NullValue()); setFixedSlot(NEWTARGET_SLOT, NullValue());
} }
bool isAfterYield();
bool isAfterAwait();
private:
bool isAfterYieldOrAwait(JSOp op);
public:
static size_t offsetOfCalleeSlot() { static size_t offsetOfCalleeSlot() {
return getFixedSlotOffset(CALLEE_SLOT); return getFixedSlotOffset(CALLEE_SLOT);
} }