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Merge pull request #5367 from Microsoft/cacheFileExists

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cache results of fileExists check in default compiler host
This commit is contained in:
Vladimir Matveev
2015-10-23 13:27:32 -07:00
parent fe19ccf7d7 19a222e718
commit 69986a158f
1 changed files with 18 additions and 0 deletions
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18
src/compiler/tsc.ts
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@@ -159,6 +159,11 @@ namespace ts {
let timerHandleForRecompilation: number; // Handle for 0.25s wait timer to trigger recompilation
let timerHandleForDirectoryChanges: number; // Handle for 0.25s wait timer to trigger directory change handler
// This map stores and reuses results of fileExists check that happen inside 'createProgram'
// This allows to save time in module resolution heavy scenarios when existence of the same file might be checked multiple times.
let cachedExistingFiles: Map<boolean>;
let hostFileExists: typeof compilerHost.fileExists;
if (commandLine.options.locale) {
if (!isJSONSupported()) {
reportDiagnostic(createCompilerDiagnostic(Diagnostics.The_current_host_does_not_support_the_0_option, "--locale"));
@@ -274,8 +279,14 @@ namespace ts {
compilerHost = createCompilerHost(compilerOptions);
hostGetSourceFile = compilerHost.getSourceFile;
compilerHost.getSourceFile = getSourceFile;
hostFileExists = compilerHost.fileExists;
compilerHost.fileExists = cachedFileExists;
}
// reset the cache of existing files
cachedExistingFiles = {};
let compileResult = compile(rootFileNames, compilerOptions, compilerHost);
if (!compilerOptions.watch) {
@@ -286,6 +297,13 @@ namespace ts {
reportWatchDiagnostic(createCompilerDiagnostic(Diagnostics.Compilation_complete_Watching_for_file_changes));
}
function cachedFileExists(fileName: string): boolean {
if (hasProperty(cachedExistingFiles, fileName)) {
return cachedExistingFiles[fileName];
}
return cachedExistingFiles[fileName] = hostFileExists(fileName);
}
function getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void) {
// Return existing SourceFile object if one is available
if (cachedProgram) {