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Bug 984985 - avoid a useless stat call when loading JS components; r=bholley

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This commit is contained in:
Nathan Froyd 2014-03-18 12:49:00 -04:00
parent 0bd3e54f92
commit 0310ca794b
1 changed files with 6 additions and 2 deletions
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8
js/xpconnect/loader/mozJSComponentLoader.cpp
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@ -837,8 +837,12 @@ mozJSComponentLoader::ObjectForLocation(nsIFile *aComponentFile,
// Make sure the file is closed, no matter how we return.
FileAutoCloser fileCloser(fileHandle);
PRFileMap *map = PR_CreateFileMap(fileHandle, fileSize,
PR_PROT_READONLY);
// We don't provide the file size here. If we did, PR_CreateFileMap
// would simply stat() the file to verify that the size we provided
// didn't require extending the file. We know that the file doesn't
// need to be extended, so skip the extra work by not providing the
// size.
PRFileMap *map = PR_CreateFileMap(fileHandle, 0, PR_PROT_READONLY);
if (!map) {
NS_ERROR("Failed to create file map");
return NS_ERROR_FAILURE;