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| author | David Majnemer <david.majnemer@gmail.com> | 2016-05-16 20:30:03 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2016-05-16 20:30:03 +0000 |
| commit | bd4a20bc9c477ee19112ea4d9440d0823bfa38b1 (patch) | |
| tree | 521631812642a59b73fb895ce42347ec577c6c3e /lib | |
| parent | 5de27450d6ed6c0461ac4865dd194eb55c2057f0 (diff) | |
| download | clang-bd4a20bc9c477ee19112ea4d9440d0823bfa38b1.tar.gz | |
[Lex] inferModuleFromLocation should do no work if there are no modules
getModuleContainingLocation ends up on the hot-path for typical C code
which can lead to calls to getFileIDSlow.
To speed this up, short circuit inferModuleFromLocation when there
aren't any modules, implicit or otherwise.
This shaves 4-5% build time when building the linux kernel.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@269687 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Lex/ModuleMap.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Lex/ModuleMap.cpp b/lib/Lex/ModuleMap.cpp index 51477185ae..3e3215dee8 100644 --- a/lib/Lex/ModuleMap.cpp +++ b/lib/Lex/ModuleMap.cpp @@ -917,6 +917,9 @@ Module *ModuleMap::inferModuleFromLocation(FullSourceLoc Loc) { if (Loc.isInvalid()) return nullptr; + if (UmbrellaDirs.empty() && Headers.empty()) + return nullptr; + // Use the expansion location to determine which module we're in. FullSourceLoc ExpansionLoc = Loc.getExpansionLoc(); if (!ExpansionLoc.isFileID()) |