Alexander Markov
62d154f6a3
If a field is initialized with null (either explicitly or implicitly), field store can be omitted in bytecode. In such case, bytecode should still convey the information about this initialization to VM for field guards to work correctly. Change-Id: I1fd45b858c3c521b97fa5dbffe0e15b1ea75d92f Reviewed-on: https://dart-review.googlesource.com/76060 Reviewed-by: Zach Anderson <zra@google.com> Reviewed-by: Régis Crelier <regis@google.com>
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
// Copyright (c) 2018, 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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#ifndef RUNTIME_VM_COMPILER_FRONTEND_BYTECODE_READER_H_
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#define RUNTIME_VM_COMPILER_FRONTEND_BYTECODE_READER_H_
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#include "vm/compiler/frontend/kernel_translation_helper.h"
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#include "vm/object.h"
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#if !defined(DART_PRECOMPILED_RUNTIME)
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namespace dart {
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namespace kernel {
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// Helper class which provides access to bytecode metadata.
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class BytecodeMetadataHelper : public MetadataHelper {
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public:
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static const char* tag() { return "vm.bytecode"; }
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explicit BytecodeMetadataHelper(KernelReaderHelper* helper,
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TypeTranslator* type_translator,
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ActiveClass* active_class);
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void ReadMetadata(const Function& function);
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private:
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// Returns the index of the last read pool entry.
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intptr_t ReadPoolEntries(const Function& function,
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const Function& inner_function,
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const ObjectPool& pool,
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intptr_t from_index);
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RawCode* ReadBytecode(const ObjectPool& pool);
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void ReadExceptionsTable(const Code& bytecode,
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bool has_exceptions_table = true);
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RawTypedData* NativeEntry(const Function& function,
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const String& external_name);
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TypeTranslator& type_translator_;
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ActiveClass* const active_class_;
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DISALLOW_COPY_AND_ASSIGN(BytecodeMetadataHelper);
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};
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class BytecodeReader : public AllStatic {
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public:
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// Reads bytecode for the given function and sets its bytecode field.
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// Returns error (if any), or null.
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static RawError* ReadFunctionBytecode(Thread* thread,
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const Function& function);
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};
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} // namespace kernel
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} // namespace dart
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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#endif // RUNTIME_VM_COMPILER_FRONTEND_BYTECODE_READER_H_
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