Florian Schneider
c05f1f9448
The first invocation of a native functions goes into LinkNativeCall which determines the final entry point and patches the object pool entry. When running precompiled code, this makes deserializing the object pool entries for native functions easy, they all initially point to a single entry (LinkNativeCall). BUG= R=rmacnak@google.com Review URL: https://codereview.chromium.org//1294113004 .
109 lines
3.6 KiB
C++
109 lines
3.6 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 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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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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// Has the entry been patched?
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static bool IsEntryPatched(const Code& code);
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// Returns true if the code can be patched with a jump at beginning (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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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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static void PatchPoolPointerCallAt(uword return_address,
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const Code& code,
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uword new_target);
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static uword 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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