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f87ac20f32
String operands used to be simple -- each line had 62 characters plus two hard-coded non-ASCII delimiters -- but now we're mixing character and hex data, so we can't use simple math to tell where the lines will break. We want to render them and keep the result around until some dependency changes, e.g. different delimiters or a change to the pseudo-op table. Also, cleaned up LineListGen a little. It had some methods that were declared static because they were expected to be shared, but that never happened. Also, fixed a bug in GatherEntityCounts where multi-line items were being scanned multiple times.
142 lines
6.5 KiB
C#
142 lines
6.5 KiB
C#
/*
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* Copyright 2019 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using Asm65;
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namespace SourceGen {
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/// <summary>
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/// Holds a cache of formatted lines.
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/// </summary>
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/// <remarks>
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/// This is intended for multi-line items with lengths that are non-trivial to compute,
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/// such as long comments (which have to do word wrapping) and strings (which may
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/// be a mix of characters and hex data). The on-demand line formatter needs to be able
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/// to render the Nth line of a multi-line string, and will potentially be very
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/// inefficient if it has to render lies 0 through N-1 as well. (Imagine the list is
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/// rendered from end to start...) Single-line items, and multi-line items that are
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/// easy to generate at an arbitrary offset (dense hex), aren't stored here.
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///
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/// The trick is knowing when the cached data must be invalidated. For example, a
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/// fully formatted string line must be invalidated if:
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/// - The Formatter changes (different delimiter definition)
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/// - The FormatDescriptor changes (different length, different text encoding, different
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/// type of string)
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/// - The PseudoOpNames table changes (potentially altering the pseudo-op string used)
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///
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/// Doing a full .equals() on the various items would reduce performance, so we use a
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/// simple test on reference equality when possible, and expect that the client will try
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/// to ensure that the various bits that are depended upon don't get replaced unnecessarily.
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/// </remarks>
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public class FormattedOperandCache {
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private const bool VERBOSE = false;
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private class FormattedStringEntry {
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public List<string> Lines { get; private set; }
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public string PseudoOpcode { get; private set; }
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private Formatter mFormatter;
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private FormatDescriptor mFormatDescriptor;
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private PseudoOp.PseudoOpNames mPseudoOpNames;
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public FormattedStringEntry(List<string> lines, string popcode, Formatter formatter,
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FormatDescriptor formatDescriptor, PseudoOp.PseudoOpNames pseudoOpNames) {
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// Can't be sure the list won't change, so duplicate it.
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Lines = new List<string>(lines.Count);
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foreach (string str in lines) {
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Lines.Add(str);
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}
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PseudoOpcode = popcode;
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mFormatter = formatter;
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mFormatDescriptor = formatDescriptor;
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mPseudoOpNames = pseudoOpNames;
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}
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/// <summary>
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/// Checks the entry's dependencies.
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/// </summary>
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/// <remarks>
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/// The data analyzer regenerates stuff in Anattribs, so we can't expect to have
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/// the same FormatDescriptor object.
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/// </remarks>
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/// <returns>True if the dependencies match.</returns>
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public bool CheckDeps(Formatter formatter, FormatDescriptor formatDescriptor,
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PseudoOp.PseudoOpNames pseudoOpNames) {
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bool ok = (ReferenceEquals(mFormatter, formatter) &&
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ReferenceEquals(mPseudoOpNames, pseudoOpNames) &&
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mFormatDescriptor == formatDescriptor);
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//if (!ok) {
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// Debug.WriteLine("CheckDeps:" +
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// (ReferenceEquals(mFormatter, formatter) ? "" : " fmt") +
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// (ReferenceEquals(mPseudoOpNames, pseudoOpNames) ? "" : " pop") +
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// (mFormatDescriptor == formatDescriptor ? "" : " dfd"));
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//}
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return ok;
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}
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}
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private Dictionary<int, FormattedStringEntry> mStringEntries =
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new Dictionary<int, FormattedStringEntry>();
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/// <summary>
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/// Retrieves the formatted string data for the specified offset.
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/// </summary>
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/// <param name="offset">File offset.</param>
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/// <param name="formatter">Formatter dependency.</param>
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/// <param name="formatDescriptor">FormatDescriptor dependency.</param>
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/// <param name="pseudoOpNames">PseudoOpNames dependency.</param>
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/// <param name="PseudoOpcode">Pseudo-op for this string.</param>
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/// <returns>A reference to the string list. The caller must not modify the
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/// list.</returns>
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public List<string> GetStringEntry(int offset, Formatter formatter,
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FormatDescriptor formatDescriptor, PseudoOp.PseudoOpNames pseudoOpNames,
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out string PseudoOpcode) {
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PseudoOpcode = null;
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if (!mStringEntries.TryGetValue(offset, out FormattedStringEntry entry)) {
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return null;
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}
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if (!entry.CheckDeps(formatter, formatDescriptor, pseudoOpNames)) {
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//Debug.WriteLine(" stale entry at +" + offset.ToString("x6"));
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return null;
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}
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PseudoOpcode = entry.PseudoOpcode;
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return entry.Lines;
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}
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/// <summary>
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/// Sets the string data entry for the specified offset.
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/// </summary>
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/// <param name="offset">File offset.</param>
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/// <param name="lines">String data.</param>
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/// <param name="pseudoOpcode">Pseudo-opcode for this line.</param>
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/// <param name="formatter">Formatter dependency.</param>
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/// <param name="formatDescriptor">FormatDescriptor dependency.</param>
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/// <param name="pseudoOpNames">PseudoOpNames dependency.</param>
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public void SetStringEntry(int offset, List<string> lines, string pseudoOpcode,
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Formatter formatter, FormatDescriptor formatDescriptor,
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PseudoOp.PseudoOpNames pseudoOpNames) {
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Debug.Assert(lines != null);
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FormattedStringEntry fse = new FormattedStringEntry(lines, pseudoOpcode,
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formatter, formatDescriptor, pseudoOpNames);
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mStringEntries[offset] = fse;
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}
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}
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}
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