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Make the parser lazy

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This commit is contained in:
Adrian Conlon
2024-09-17 12:31:02 +01:00
parent a2b3427b5c
commit 53aa4a8820
1 changed files with 144 additions and 68 deletions
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212
M6502/M6502.Symbols/Parser.cs
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@@ -12,29 +12,146 @@
{
#region Variables, properties etc.
public bool Parsed { get; private set; }
// Section -> Unique ID list of dictionary entries
private readonly Dictionary<string, List<Dictionary<string, string>>> _parsed = [];
private Dictionary<string, List<Dictionary<string, string>>>? _parsed;
private Version? _version;
private Information? _information;
public List<File> Files { get; } = [];
public List<Line> Lines { get; } = [];
public List<Module> Modules { get; } = [];
public List<Segment> Segments { get; } = [];
public List<Span> Spans { get; } = [];
public List<Scope> Scopes { get; } = [];
public List<Symbol> Symbols { get; } = [];
public List<Type> Types { get; } = [];
private List<File>? _files;
private List<Line>? _lines;
private List<Module>? _modules;
private List<Segment>? _segments;
private List<Span>? _spans;
private List<Scope>? _scopes;
private List<Symbol>? _symbols;
private List<Type>? _types;
public ref List<File>? Files
{
get
{
if (_files == null)
{
this.ExtractFiles();
}
return ref this._files;
}
}
public ref List<Line>? Lines
{
get
{
if (_lines == null)
{
this.ExtractLines();
}
return ref this._lines;
}
}
public ref List<Module>? Modules
{
get
{
if (_modules == null)
{
this.ExtractModules();
}
return ref this._modules;
}
}
public ref List<Segment>? Segments
{
get
{
if (_segments == null)
{
this.ExtractSegments();
}
return ref this._segments;
}
}
public ref List<Span>? Spans
{
get
{
if (_spans == null)
{
this.ExtractSpans();
}
return ref this._spans;
}
}
public ref List<Scope>? Scopes
{
get
{
if (_scopes == null)
{
this.ExtractScopes();
}
return ref this._scopes;
}
}
public ref List<Symbol>? Symbols
{
get
{
if (_symbols == null)
{
this.ExtractSymbols();
}
return ref this._symbols;
}
}
public ref List<Type>? Types
{
get
{
if (_types == null)
{
this.ExtractTypes();
}
return ref this._types;
}
}
// Symbol sub-types
public IEnumerable<Symbol> Labels => this.SelectSymbolsByType("lab");
public IEnumerable<Symbol> Equates => this.SelectSymbolsByType("equ");
// Scope clarification
public List<Scope> AddressableScopes { get; } = [];
private List<Scope>? _addressableScopes;
public List<Scope> AddressableScopes
{
get
{
if (_addressableScopes == null)
{
var scopes = from scope in this.Scopes where scope.Symbol != null select scope;
this._addressableScopes = [];
this._addressableScopes.AddRange(scopes);
}
return this._addressableScopes;
}
}
// Scope cache for precomputed ranges
private readonly int?[] _scopeAddressCache = new int?[0x10000];
@@ -43,9 +160,9 @@
#region Lookups
private static IEnumerable<T> SelectNameMatching<T>(string name, IEnumerable<T> items) where T : NamedSection => from item in items where item.Name == name select item;
private static IEnumerable<T> SelectNameMatching<T>(string name, IEnumerable<T>? items) where T : NamedSection => from item in items where item.Name == name select item;
private static IEnumerable<T> SelectIdMatching<T>(int id, IEnumerable<T> items) where T : IdentifiableSection => from item in items where item.ID == id select item;
private static IEnumerable<T> SelectIdMatching<T>(int id, IEnumerable<T>? items) where T : IdentifiableSection => from item in items where item.ID == id select item;
private IEnumerable<Symbol> SelectSymbolsByType(string type) => from symbol in this.Symbols where symbol.Type == type select symbol;
@@ -240,36 +357,31 @@
#region Section extractors
private void ExtractFiles() => this.Extract<File>("file", this.Files);
private void ExtractFiles() => this.Extract<File>("file", ref this._files);
private void ExtractLines() => this.Extract<Line>("line", this.Lines);
private void ExtractLines() => this.Extract<Line>("line", ref this._lines);
private void ExtractModules() => this.Extract<Module>("mod", this.Modules);
private void ExtractModules() => this.Extract<Module>("mod", ref this._modules);
private void ExtractSegments() => this.Extract<Segment>("seg", this.Segments);
private void ExtractSegments() => this.Extract<Segment>("seg", ref this._segments);
private void ExtractSpans() => this.Extract<Span>("span", this.Spans);
private void ExtractSpans() => this.Extract<Span>("span", ref this._spans);
private void ExtractScopes() => this.Extract<Scope>("scope", this.Scopes);
private void ExtractScopes() => this.Extract<Scope>("scope", ref this._scopes);
private void ExtractSymbols() => this.Extract<Symbol>("sym", this.Symbols);
private void ExtractSymbols() => this.Extract<Symbol>("sym", ref this._symbols);
private void ExtractTypes() => this.Extract<Type>("type", this.Types);
private void ExtractTypes() => this.Extract<Type>("type", ref this._types);
private void Extract<T>(string key, List<T> into) where T : IdentifiableSection
private void Extract<T>(string key, ref List<T>? into) where T : IdentifiableSection
{
if (this._parsed == null)
{
throw new InvalidOperationException("Parsed dictionary has not been frozen");
}
Debug.Assert(this._parsed != null);
if (!this._parsed.TryGetValue(key, out var parsed))
{
throw new ArgumentOutOfRangeException(nameof(key), key, "Debugging section is unavailable");
}
Debug.Assert(into.Count == 0);
into.Capacity = parsed.Count;
into = new List<T>(parsed.Count);
for (var id = 0; id < parsed.Count; ++id)
{
Debug.Assert(into.Count == id);
@@ -290,11 +402,6 @@
public async Task ParseAsync(string? path)
{
if (this.Parsed)
{
throw new InvalidOperationException("A file has already been parsed.");
}
if (string.IsNullOrEmpty(path))
{
return;
@@ -306,29 +413,7 @@
private async Task ParseAsync(StreamReader reader)
{
await this.ParseLinesAsync(reader);
this.ExtractFiles();
this.ExtractLines();
this.ExtractModules();
this.ExtractSegments();
this.ExtractSpans();
this.ExtractScopes();
this.ExtractSymbols();
this.ExtractTypes();
// Parsed dictionary is no longer needed
this._parsed.Clear();
// We are now mostly parsed
this.Parsed = true;
// Oh, except for marking addressable scopes
this.BuildAddressableScopes();
}
private async Task ParseLinesAsync(StreamReader reader)
{
this._parsed = [];
while (!reader.EndOfStream)
{
var line = await reader.ReadLineAsync();
@@ -341,16 +426,6 @@
}
}
private void BuildAddressableScopes()
{
if (!this.Parsed)
{
throw new InvalidOperationException("Fully parsed scopes are unavailable");
}
var scopes = from scope in this.Scopes where scope.Symbol != null select scope;
this.AddressableScopes.AddRange(scopes);
}
private void ParseLine(string[] elements)
{
ArgumentNullException.ThrowIfNull(elements, nameof(elements));
@@ -377,6 +452,7 @@
private void Parse(string key, string[] parts)
{
Debug.Assert(this._parsed != null);
if (!this._parsed.TryGetValue(key, out var section))
{
this._parsed[key] = [];