Alexander Markov
ed48cfeb47
This includes both interpreted and compiled bytecode. Change-Id: I6309ec4f0687f68caf6260cc57dacf94f027177d Reviewed-on: https://dart-review.googlesource.com/c/84481 Commit-Queue: Alexander Markov <alexmarkov@google.com> Auto-Submit: Alexander Markov <alexmarkov@google.com> Reviewed-by: Régis Crelier <regis@google.com>
101 lines
3.2 KiB
C++
101 lines
3.2 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/constants_kbc.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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bool HasBytecode(intptr_t node_offset);
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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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RawBytecode* ReadBytecode(const ObjectPool& pool);
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void ReadExceptionsTable(const Bytecode& bytecode, bool has_exceptions_table);
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void ReadSourcePositions(const Bytecode& bytecode, bool has_source_positions);
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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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class BytecodeSourcePositionsIterator : ValueObject {
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public:
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BytecodeSourcePositionsIterator(Zone* zone, const Bytecode& bytecode)
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: reader_(ExternalTypedData::Handle(zone, bytecode.GetBinary(zone))),
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pairs_remaining_(0),
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cur_bci_(0),
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cur_token_pos_(TokenPosition::kNoSource.value()) {
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if (bytecode.HasSourcePositions()) {
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reader_.set_offset(bytecode.source_positions_binary_offset());
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pairs_remaining_ = reader_.ReadUInt();
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}
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}
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bool MoveNext() {
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if (pairs_remaining_ == 0) {
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return false;
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}
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ASSERT(pairs_remaining_ > 0);
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--pairs_remaining_;
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cur_bci_ += reader_.ReadUInt();
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cur_token_pos_ += reader_.ReadSLEB128();
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return true;
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}
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intptr_t BytecodeInstructionIndex() const { return cur_bci_; }
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uword PcOffset() const {
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return KernelBytecode::BytecodePcToOffset(BytecodeInstructionIndex(),
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/* is_return_address = */ true);
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}
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TokenPosition TokenPos() const { return TokenPosition(cur_token_pos_); }
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private:
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Reader reader_;
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intptr_t pairs_remaining_;
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intptr_t cur_bci_;
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intptr_t cur_token_pos_;
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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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