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authorGaming4JC <g4jc@hyperbola.info>2019-12-03 17:34:06 -0500
committerGaming4JC <g4jc@hyperbola.info>2019-12-17 06:25:24 -0500
commit73c8732000a5d594322c8aa33840a3449cf8bd4e (patch)
treefa688737684140c660c2a15fca453d091c5cceee /js/src
parent3a3de55aadd9d3a2aafc3638c7a9b0c23584cef4 (diff)
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Bug 1343481 - Part 4: Add Add GeneratorObject.{isAfterYield,isAfterAwait}.
Tag #1287
Diffstat (limited to 'js/src')
-rw-r--r--js/src/vm/GeneratorObject.cpp31
-rw-r--r--js/src/vm/GeneratorObject.h7
2 files changed, 38 insertions, 0 deletions
diff --git a/js/src/vm/GeneratorObject.cpp b/js/src/vm/GeneratorObject.cpp
index a61d37132..11c686f28 100644
--- a/js/src/vm/GeneratorObject.cpp
+++ b/js/src/vm/GeneratorObject.cpp
@@ -370,3 +370,34 @@ js::CheckStarGeneratorResumptionValue(JSContext* cx, HandleValue v)
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;
+}
diff --git a/js/src/vm/GeneratorObject.h b/js/src/vm/GeneratorObject.h
index beb15f790..f19ca2aac 100644
--- a/js/src/vm/GeneratorObject.h
+++ b/js/src/vm/GeneratorObject.h
@@ -179,6 +179,13 @@ class GeneratorObject : public NativeObject
setFixedSlot(NEWTARGET_SLOT, NullValue());
}
+ bool isAfterYield();
+ bool isAfterAwait();
+
+private:
+ bool isAfterYieldOrAwait(JSOp op);
+
+public:
static size_t offsetOfCalleeSlot() {
return getFixedSlotOffset(CALLEE_SLOT);
}