Florian Schneider
4a653d9e17
Reserve first element in the Function's ic_data_array to hold the edge counter array. Until now we had a one-element array per edge counter. This reduces memory used by edge counters. This CL allows to optimize code without having to have the unoptimized code present. Also, save space in Instruction by making place_id_ and lifetime_position_ a union. place_id_ is exclusively needed by Load/StoreOptimizer, lifetime_position by the FlowGraphAllocator. BUG= R=asiva@google.com Review URL: https://codereview.chromium.org//1343383003 .
99 lines
3.2 KiB
C++
99 lines
3.2 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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#include "vm/native_entry.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 RawCode;
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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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// Stack-allocated class to create a scope where the specified region
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// [address, addresss + size] has write access enabled. This is used
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// when patching generated code. Access is reset to read-execute in
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// the destructor of this scope.
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class WritableInstructionsScope : public ValueObject {
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public:
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WritableInstructionsScope(uword address, intptr_t size);
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~WritableInstructionsScope();
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private:
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const uword address_;
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const intptr_t size_;
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};
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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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const Code& new_target);
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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, const Code& new_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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// Has the entry been patched?
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static bool IsEntryPatched(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 RawCode* 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 RawCode* 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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static intptr_t InstanceCallSizeInBytes();
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static void InsertDeoptimizationCallAt(uword start, uword target);
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static void PatchPoolPointerCallAt(uword return_address,
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const Code& code,
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const Code& new_target);
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static RawCode* GetNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction* target);
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static void PatchNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction target,
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const Code& trampoline);
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};
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} // namespace dart
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#endif // VM_CODE_PATCHER_H_
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