kmillikin@google.com
e375053d2f
In unoptimized code, use platform-specific pattern matching on generated code to find edge counter arrays. Previously we searched pointer offsets, but that does not work on platforms that encode the edge counters as indexes into an object pool (i.e., x64, ARM, MIPS). BUG= R=fschneider@google.com, zra@google.com Review URL: https://codereview.chromium.org//24744002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28085 260f80e4-7a28-3924-810f-c04153c831b5
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Class for patching compiled code.
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#ifndef VM_CODE_PATCHER_H_
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#define VM_CODE_PATCHER_H_
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#include "vm/allocation.h"
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namespace dart {
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// Forward declaration.
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class Array;
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class Code;
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class ExternalLabel;
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class Function;
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class ICData;
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class RawArray;
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class RawFunction;
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class RawICData;
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class RawObject;
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class String;
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class CodePatcher : public AllStatic {
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public:
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// Dart static calls have a distinct, machine-dependent code pattern.
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// Patch static call before return_address in given code to the new target.
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static void PatchStaticCallAt(uword return_address,
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const Code& code,
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uword new_target_address);
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// Patch instance call before return_address in given code to the new target.
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static void PatchInstanceCallAt(uword return_address,
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const Code& code,
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uword new_target_address);
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// Patch entry point with a jump as specified in the code's patch region.
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static void PatchEntry(const Code& code);
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// Restore entry point with original code (i.e., before patching).
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static void RestoreEntry(const Code& code);
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// Returns true if the code can be patched with a jump at beginnning (checks
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// that there are no conflicts with object pointers). Used in ASSERTs.
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static bool CodeIsPatchable(const Code& code);
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// Return the target address of the static call before return_address
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// in given code.
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static uword GetStaticCallTargetAt(uword return_address, const Code& code);
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// Get instance call information. Returns the call target and sets each
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// of the output parameters ic_data and arguments_descriptor if they are
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// non-NULL.
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static uword GetInstanceCallAt(uword return_address,
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const Code& code,
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ICData* ic_data);
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// Return target of an unoptimized static call and its ICData object
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// (calls target via a stub).
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static RawFunction* GetUnoptimizedStaticCallAt(uword return_address,
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const Code& code,
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ICData* ic_data);
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// Return the arguments descriptor array of the closure call
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// before the given return address.
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static RawArray* GetClosureArgDescAt(uword return_address,
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const Code& code);
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static intptr_t InstanceCallSizeInBytes();
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static void InsertCallAt(uword start, uword target);
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static RawObject* GetEdgeCounterAt(uword pc, const Code& code);
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};
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} // namespace dart
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#endif // VM_CODE_PATCHER_H_
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