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Reduce lambda allocations in the parser.

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This commit is contained in:
Cyrus Najmabadi 2014-11-24 15:55:04 -08:00
parent f6c1fe710e
commit 7cc78e3862
1 changed files with 17 additions and 8 deletions
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25
src/compiler/parser.ts
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@ -2672,13 +2672,13 @@ module ts {
parseExpected(SyntaxKind.OpenParenToken);
if (token !== SyntaxKind.SemicolonToken) {
if (parseOptional(SyntaxKind.VarKeyword)) {
var declarations = disallowInAnd(() => parseVariableDeclarationList(0));
var declarations = disallowInAnd(parseVariableDeclarationList);
}
else if (parseOptional(SyntaxKind.LetKeyword)) {
var declarations = disallowInAnd(() => parseVariableDeclarationList(NodeFlags.Let));
var declarations = setFlag(disallowInAnd(parseVariableDeclarationList), NodeFlags.Let);
}
else if (parseOptional(SyntaxKind.ConstKeyword)) {
var declarations = disallowInAnd(() => parseVariableDeclarationList(NodeFlags.Const));
var declarations = setFlag(disallowInAnd(parseVariableDeclarationList), NodeFlags.Const);
}
else {
var varOrInit = disallowInAnd(parseExpression);
@ -2994,17 +2994,24 @@ module ts {
// DECLARATIONS
function parseVariableDeclaration(flags: NodeFlags): VariableDeclaration {
function parseVariableDeclaration(): VariableDeclaration {
var node = <VariableDeclaration>createNode(SyntaxKind.VariableDeclaration);
node.flags = flags;
node.name = parseIdentifier();
node.type = parseTypeAnnotation();
node.initializer = parseInitializer(/*inParameter*/ false);
return finishNode(node);
}
function parseVariableDeclarationList(flags: NodeFlags): NodeArray<VariableDeclaration> {
return parseDelimitedList(ParsingContext.VariableDeclarations, () => parseVariableDeclaration(flags));
function setFlag(array: NodeArray<VariableDeclaration>, flag: NodeFlags): NodeArray<VariableDeclaration> {
for (var i = 0, n = array.length; i < n; i++) {
array[i].flags |= flag;
}
return array;
}
function parseVariableDeclarationList(): NodeArray<VariableDeclaration> {
return parseDelimitedList(ParsingContext.VariableDeclarations, parseVariableDeclaration);
}
function parseVariableStatement(fullStart: number, modifiers: ModifiersArray): VariableStatement {
@ -3022,7 +3029,9 @@ module ts {
}
nextToken();
node.declarations = allowInAnd(() => parseVariableDeclarationList(node.flags));
node.declarations = allowInAnd(parseVariableDeclarationList);
setFlag(node.declarations, node.flags);
parseSemicolon();
return finishNode(node);
}