Alexander Markov
372b02d97f
Change-Id: I22bbd3b7ea0cccc0a8d721c3766a80ae1c72060d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/87701 Commit-Queue: Alexander Markov <alexmarkov@google.com> Reviewed-by: Régis Crelier <regis@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>
63 lines
1.8 KiB
Dart
63 lines
1.8 KiB
Dart
// 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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library vm.bytecode.source_positions;
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import 'bytecode_serialization.dart'
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show
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BufferedWriter,
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BufferedReader,
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PackedUInt30DeltaEncoder,
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PackedUInt30DeltaDecoder,
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SLEB128DeltaEncoder,
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SLEB128DeltaDecoder;
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/// Maintains mapping between bytecode instructions and source positions.
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class SourcePositions {
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final Map<int, int> mapping = <int, int>{}; // PC -> fileOffset
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int _lastPc = 0;
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int _lastOffset = 0;
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SourcePositions();
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void add(int pc, int fileOffset) {
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assert(pc > _lastPc);
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assert(fileOffset >= 0);
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if (fileOffset != _lastOffset) {
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mapping[pc] = fileOffset;
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_lastPc = pc;
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_lastOffset = fileOffset;
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}
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}
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void write(BufferedWriter writer) {
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writer.writePackedUInt30(mapping.length);
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final encodePC = new PackedUInt30DeltaEncoder();
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final encodeOffset = new SLEB128DeltaEncoder();
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mapping.forEach((int pc, int fileOffset) {
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encodePC.write(writer, pc);
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encodeOffset.write(writer, fileOffset);
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});
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}
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SourcePositions.read(BufferedReader reader) {
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final int length = reader.readPackedUInt30();
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final decodePC = new PackedUInt30DeltaDecoder();
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final decodeOffset = new SLEB128DeltaDecoder();
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for (int i = 0; i < length; ++i) {
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int pc = decodePC.read(reader);
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int fileOffset = decodeOffset.read(reader);
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add(pc, fileOffset);
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}
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}
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@override
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String toString() => mapping.toString();
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Map<int, String> getBytecodeAnnotations() {
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return mapping.map((int pc, int fileOffset) =>
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new MapEntry(pc, 'source position $fileOffset'));
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}
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}
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