huahaofeng
/
aspnetcore
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Optimize C# symbol content string allocation

This commit is contained in:
Yves57 2017-01-07 12:45:29 +01:00 committed by N. Taylor Mullen
parent 8215d28ada
commit 5fa4672c99
2 changed files with 178 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

175
src/Microsoft.AspNetCore.Razor.Evolution/Legacy/CSharpTokenizer.cs
View File

@ -168,6 +168,181 @@ namespace Microsoft.AspNetCore.Razor.Evolution.Legacy
}
}
// Optimize memory allocation by returning constants for the most frequent cases
protected override string GetSymbolContent(CSharpSymbolType type)
{
var symbolLength = Buffer.Length;
if (symbolLength == 1)
{
switch (type)
{
case CSharpSymbolType.IntegerLiteral:
switch (Buffer[0])
{
case '0':
return "0";
case '1':
return "1";
case '2':
return "2";
case '3':
return "3";
case '4':
return "4";
case '5':
return "5";
case '6':
return "6";
case '7':
return "7";
case '8':
return "8";
case '9':
return "9";
}
break;
case CSharpSymbolType.NewLine:
if (Buffer[0] == '\n')
{
return "\n";
}
break;
case CSharpSymbolType.WhiteSpace:
if (Buffer[0] == ' ')
{
return " ";
}
if (Buffer[0] == '\t')
{
return "\t";
}
break;
case CSharpSymbolType.Minus:
return "-";
case CSharpSymbolType.Not:
return "!";
case CSharpSymbolType.Modulo:
return "%";
case CSharpSymbolType.And:
return "&";
case CSharpSymbolType.LeftParenthesis:
return "(";
case CSharpSymbolType.RightParenthesis:
return ")";
case CSharpSymbolType.Star:
return "*";
case CSharpSymbolType.Comma:
return ",";
case CSharpSymbolType.Dot:
return ".";
case CSharpSymbolType.Slash:
return "/";
case CSharpSymbolType.Colon:
return ":";
case CSharpSymbolType.Semicolon:
return ";";
case CSharpSymbolType.QuestionMark:
return "?";
case CSharpSymbolType.RightBracket:
return "]";
case CSharpSymbolType.LeftBracket:
return "[";
case CSharpSymbolType.Xor:
return "^";
case CSharpSymbolType.LeftBrace:
return "{";
case CSharpSymbolType.Or:
return "|";
case CSharpSymbolType.RightBrace:
return "}";
case CSharpSymbolType.Tilde:
return "~";
case CSharpSymbolType.Plus:
return "+";
case CSharpSymbolType.LessThan:
return "<";
case CSharpSymbolType.Assign:
return "=";
case CSharpSymbolType.GreaterThan:
return ">";
case CSharpSymbolType.Hash:
return "#";
case CSharpSymbolType.Transition:
return "@";
}
}
else if (symbolLength == 2)
{
switch (type)
{
case CSharpSymbolType.NewLine:
return "\r\n";
case CSharpSymbolType.Arrow:
return "->";
case CSharpSymbolType.Decrement:
return "--";
case CSharpSymbolType.MinusAssign:
return "-=";
case CSharpSymbolType.NotEqual:
return "!=";
case CSharpSymbolType.ModuloAssign:
return "%=";
case CSharpSymbolType.AndAssign:
return "&=";
case CSharpSymbolType.DoubleAnd:
return "&&";
case CSharpSymbolType.MultiplyAssign:
return "*=";
case CSharpSymbolType.DivideAssign:
return "/=";
case CSharpSymbolType.DoubleColon:
return "::";
case CSharpSymbolType.NullCoalesce:
return "??";
case CSharpSymbolType.XorAssign:
return "^=";
case CSharpSymbolType.OrAssign:
return "|=";
case CSharpSymbolType.DoubleOr:
return "||";
case CSharpSymbolType.PlusAssign:
return "+=";
case CSharpSymbolType.Increment:
return "++";
case CSharpSymbolType.LessThanEqual:
return "<=";
case CSharpSymbolType.LeftShift:
return "<<";
case CSharpSymbolType.Equals:
return "==";
case CSharpSymbolType.GreaterThanEqual:
if (Buffer[0] == '=')
{
return "=>";
}
return ">=";
case CSharpSymbolType.RightShift:
return ">>";
}
}
else if (symbolLength == 3)
{
switch (type)
{
case CSharpSymbolType.LeftShiftAssign:
return "<<=";
case CSharpSymbolType.RightShiftAssign:
return ">>=";
}
}
return base.GetSymbolContent(type);
}
protected override CSharpSymbol CreateSymbol(string content, CSharpSymbolType type, IReadOnlyList<RazorError> errors)
{
return new CSharpSymbol(content, type, errors);

4
src/Microsoft.AspNetCore.Razor.Evolution/Legacy/Tokenizer.cs
View File

@ -211,7 +211,9 @@ namespace Microsoft.AspNetCore.Razor.Evolution.Legacy
errors[i] = CurrentErrors[i];
}
symbol = CreateSymbol(GetSymbolContent(type), type, errors);
var symbolContent = GetSymbolContent(type);
Debug.Assert(string.Equals(symbolContent, Buffer.ToString(), StringComparison.Ordinal));
symbol = CreateSymbol(symbolContent, type, errors);
Buffer.Clear();
CurrentErrors.Clear();