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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 // Class for handling inline cache stubs | |
| 5 // | |
| 6 // The initial target of an instance call is the resolving and patching runtime | |
| 7 // function 'ResolvePatchInstanceCall'. It resolves and compiles the | |
| 8 // target function and patches the instance call to jump to it | |
| 9 // via an inline cache stub. | |
| 10 // The inline cache stub checks receiver's class for a distinct set of classes | |
| 11 // and jumps to the appropriate target. | |
| 12 // An inline-cache-miss occurs if none of the classes match. As a consequence | |
| 13 // the old IC stub is replaced with a new one that adds the class check | |
| 14 // and target for the most recently seen receiver. | |
| 15 | |
| 16 #ifndef VM_IC_STUBS_H_ | |
| 17 #define VM_IC_STUBS_H_ | |
| 18 | |
| 19 #include "vm/allocation.h" | |
| 20 #include "vm/growable_array.h" | |
| 21 | |
| 22 namespace dart { | |
| 23 | |
| 24 // Forward declarations. | |
| 25 class Class; | |
| 26 class Code; | |
| 27 class Function; | |
| 28 class RawCode; | |
| 29 | |
| 30 class ICStubs : public AllStatic { | |
| 31 public: | |
| 32 // Returns an IC stub that jumps to targets' entry points if the receiver | |
| 33 // matches a class contained in 'classes' array. | |
| 34 static RawCode* GetICStub(const GrowableArray<const Class*>& classes, | |
| 35 const GrowableArray<const Function*>& targets); | |
| 36 | |
| 37 // Identify classes and their targets contained in the IC stub. | |
| 38 // 'ic_entry_point' is the start of the IC stubs. 'classes' and 'targets' | |
| 39 // are the implemented (class, target) tuples. | |
| 40 // Returns false if the entry_point does not point to an IC stub. | |
| 41 static bool RecognizeICStub(uword ic_entry_point, | |
| 42 GrowableArray<const Class*>* classes, | |
| 43 GrowableArray<const Function*>* targets); | |
| 44 | |
| 45 // Replace all 'from' targets with 'to' targets. | |
| 46 static void PatchTargets(uword ic_entry_point, uword from, uword to); | |
| 47 | |
| 48 // Locate a class within the array. Return -1 if class object in 'cls' | |
| 49 // is not in the array. | |
| 50 // TODO(srdjan): Remove from ICStubs interface. | |
| 51 static int IndexOfClass(const GrowableArray<const Class*>& classes, | |
| 52 const Class& cls); | |
| 53 | |
| 54 private: | |
| 55 static RawCode* FindInCode(const Code& target, | |
| 56 const GrowableArray<const Class*>& classes); | |
| 57 static void AppendICStubToTargets( | |
| 58 const GrowableArray<const Function*>& targets, | |
| 59 const GrowableArray<const Class*>& classes, | |
| 60 const Code& ic_stub); | |
| 61 static bool ParseICStub(uword ic_entry_point, | |
| 62 GrowableArray<const Class*>* classes, | |
| 63 GrowableArray<const Function*>* targets, | |
| 64 uword from, | |
| 65 uword to); | |
| 66 }; | |
| 67 | |
| 68 } // namespace dart | |
| 69 | |
| 70 #endif // VM_IC_STUBS_H_ | |
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Chromium Code Reviews
Issue 8379013:
Implement new inline cache. (Closed)
Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/runtime/