Martin Kustermann
28f8c96abe
If the --use-bare-instructions flag is enabled we will:
* Make call sites load the target directly from the pool (instead of
the code object) - this saves one instruction (and an indirect load)
* Ensure the object pool will have direct entry addresses by:
- Letting the clustered snapshot reader change any StubCode::UnlinkedCall()
in the object pool by it's monomorphic entry
- Change the code patcher to patch SwitchableCalls by writing the
monomorphic entry into the pool (instead of the code object)
Issue https://github.com/dart-lang/sdk/issues/33274
Change-Id: I4e41fc8e4461bde477cc559a6a4fccaaf3a350b5
Reviewed-on: https://dart-review.googlesource.com/c/86160
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
128 lines
4.7 KiB
C++
128 lines
4.7 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 RUNTIME_VM_CODE_PATCHER_H_
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#define RUNTIME_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, address + 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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// 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 void InsertDeoptimizationCallAt(uword start);
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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 void PatchSwitchableCallAt(uword return_address,
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const Code& caller_code,
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const Object& data,
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const Code& target);
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static RawObject* GetSwitchableCallDataAt(uword return_address,
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const Code& caller_code);
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static RawCode* GetSwitchableCallTargetAt(uword return_address,
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const Code& caller_code);
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#if defined(TARGET_ARCH_DBC)
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static NativeFunctionWrapper GetNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction* target);
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#else
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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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#endif
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#if defined(TARGET_ARCH_DBC)
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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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NativeFunctionWrapper trampoline);
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#else
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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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#endif
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static intptr_t GetSubtypeTestCachePoolIndex(uword return_address);
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};
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// Beginning from [end - size] we compare [size] bytes with [pattern]. All
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// [0..255] values in [pattern] have to match, negative values are skipped.
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//
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// Example pattern: `[0x3d, 0x8b, -1, -1]`.
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bool MatchesPattern(uword end, const int16_t* pattern, intptr_t size);
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class KBCPatcher : public AllStatic {
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public:
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static NativeFunctionWrapper GetNativeCallAt(uword return_address,
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const Bytecode& bytecode,
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NativeFunction* function);
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static void PatchNativeCallAt(uword return_address,
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const Bytecode& bytecode,
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NativeFunction function,
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NativeFunctionWrapper trampoline);
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};
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} // namespace dart
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#endif // RUNTIME_VM_CODE_PATCHER_H_
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