JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / dfg / DFGOSRAvailabilityAnalysisPhase.h

diff --git a/dfg/DFGOSRAvailabilityAnalysisPhase.h b/dfg/DFGOSRAvailabilityAnalysisPhase.h
index a5ec71bab7b314953b10f04080061c666bbf86f3..064bec03c47df65e0d5efb4e2832936ed1cd1dcc 100644 (file)
--- a/dfg/DFGOSRAvailabilityAnalysisPhase.h
+++ b/dfg/DFGOSRAvailabilityAnalysisPhase.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -28,6 +28,7 @@
 
 #if ENABLE(DFG_JIT)
 
+#include "DFGBasicBlock.h"
 #include "DFGCommon.h"
 
 namespace JSC { namespace DFG {
@@ -35,10 +36,27 @@ namespace JSC { namespace DFG {
 class Graph;
 
 // Computes BasicBlock::ssa->availabiltiyAtHead/Tail. This is a forward flow type inference
-// over MovHints and SetLocals.
+// over MovHints and SetLocals. This analysis is run directly by the Plan for preparing for
+// lowering to LLVM IR, but it can also be used as a utility. Note that if you run it before
+// stack layout, all of the flush availability will omit the virtual register - but it will
+// tell you the format.
 
 bool performOSRAvailabilityAnalysis(Graph&);
 
+// Local calculator for figuring out the availability at any node in a basic block. Requires
+// having run the availability analysis.
+class LocalOSRAvailabilityCalculator {
+public:
+    LocalOSRAvailabilityCalculator();
+    ~LocalOSRAvailabilityCalculator();
+    
+    void beginBlock(BasicBlock*);
+    void endBlock(BasicBlock*); // Useful if you want to get data for the end of the block. You don't need to call this if you did beginBlock() and then executeNode() for every node.
+    void executeNode(Node*);
+    
+    AvailabilityMap m_availability;
+};
+
 } } // namespace JSC::DFG
 
 #endif // ENABLE(DFG_JIT)