fourthTier: Create an equivalent of Structure::get() that can work from a compilation thread
https://bugs.webkit.org/show_bug.cgi?id=114987
Reviewed by Geoffrey Garen.
This completes the work started by r148570. That patch made it possible to do
Structure::get() without modifying Structure. This patch takes this further, and
makes this thread-safe (for non-uncacheable-dictionaries) via
Structure::getConcurrently(). This method not only doesn't modify Structure, but
also ensures that any concurrent attempts to add to, remove from, or steal the
table from that structure doesn't mess up the result of the call. The call may
return invalidOffset even if a property is *just* about to be added, but it will
never do the reverse: if it returns a property then you can be sure that the
structure really does have that property and always will have it.
* bytecode/GetByIdStatus.cpp:
(JSC::GetByIdStatus::computeFromLLInt):
(JSC::GetByIdStatus::computeForChain):
(JSC::GetByIdStatus::computeFor):
* bytecode/PutByIdStatus.cpp:
(JSC::PutByIdStatus::computeFromLLInt):
(JSC::PutByIdStatus::computeFor):
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::isStringPrototypeMethodSane):
* runtime/PropertyMapHashTable.h:
(PropertyTable):
(JSC::PropertyTable::findConcurrently):
(JSC):
(JSC::PropertyTable::add):
(JSC::PropertyTable::remove):
(JSC::PropertyTable::reinsert):
(JSC::PropertyTable::rehash):
* runtime/PropertyTable.cpp:
(JSC::PropertyTable::PropertyTable):
* runtime/Structure.cpp:
(JSC::Structure::findStructuresAndMapForMaterialization):
(JSC::Structure::getConcurrently):
* runtime/Structure.h:
(Structure):
* runtime/StructureInlines.h:
(JSC::Structure::getConcurrently):
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153128 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp b/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
index 27bb1ac..f4d80aa 100644
--- a/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
+++ b/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp
@@ -1083,7 +1083,7 @@
{
unsigned attributesUnused;
JSCell* specificValue;
- PropertyOffset offset = stringPrototypeStructure->get(
+ PropertyOffset offset = stringPrototypeStructure->getConcurrently(
vm(), ident, attributesUnused, specificValue);
if (!isValidOffset(offset))
return false;
