diff options
Diffstat (limited to 'Source/JavaScriptCore/dfg/DFGArgumentsSimplificationPhase.cpp')
| -rw-r--r-- | Source/JavaScriptCore/dfg/DFGArgumentsSimplificationPhase.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGArgumentsSimplificationPhase.cpp b/Source/JavaScriptCore/dfg/DFGArgumentsSimplificationPhase.cpp index 9208cde1b..000e1a938 100644 --- a/Source/JavaScriptCore/dfg/DFGArgumentsSimplificationPhase.cpp +++ b/Source/JavaScriptCore/dfg/DFGArgumentsSimplificationPhase.cpp @@ -317,6 +317,17 @@ public: // PhantomArguments and OSR exit will still do the right things. break; + case CheckStructure: + case ForwardCheckStructure: + case StructureTransitionWatchpoint: + case ForwardStructureTransitionWatchpoint: + // We don't care about these because if we get uses of the relevant + // variable then we can safely get rid of these, too. This of course + // relies on there not being any information transferred by the CFA + // from a CheckStructure on one variable to the information about the + // structures of another variable. + break; + default: observeBadArgumentsUses(node); break; @@ -471,6 +482,19 @@ public: break; } + case CheckStructure: + case ForwardCheckStructure: + case StructureTransitionWatchpoint: + case ForwardStructureTransitionWatchpoint: { + // We can just get rid of this node, if it references a phantom argument. + if (!isOKToOptimize(m_graph[node.child1()])) + break; + m_graph.deref(node.child1()); + node.setOpAndDefaultFlags(Phantom); + node.children.setChild1(Edge()); + break; + } + case GetByVal: { if (!node.prediction() || !m_graph[node.child1()].prediction() |