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Bitmangle file characteristic bits into the low bits of 

the content cache pointer.  This saves 105876 bytes on
cocoa.h because it shrinks the SLocEntry union, which
we have a big array of.  It would be nice to use 
PointerIntPair here, but we can't because it is in a 
union.

llvm-svn: 63004
This commit is contained in:
Chris Lattner 2009-01-26 06:49:09 +00:00
parent 76e689636b
commit 273fc663df
1 changed files with 12 additions and 10 deletions
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22
clang/include/clang/Basic/SourceManager.h
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@ -130,31 +130,33 @@ namespace SrcMgr {
/// This is an invalid SLOC for the main file (top of the #include chain).
unsigned IncludeLoc; // Really a SourceLocation
/// Content - Information about the source buffer itself.
const ContentCache *Content;
/// FileCharacteristic - This is an instance of CharacteristicKind,
/// indicating whether this is a system header dir or not.
unsigned FileCharacteristic : 2;
/// Data - This contains the ContentCache* and the bits indicating the
/// characteristic of the file and whether it has #line info, all bitmangled
/// together.
uintptr_t Data;
public:
/// get - Return a FileInfo object.
static FileInfo get(SourceLocation IL, const ContentCache *Con,
CharacteristicKind FileCharacter) {
FileInfo X;
X.IncludeLoc = IL.getRawEncoding();
X.Content = Con;
X.FileCharacteristic = FileCharacter;
X.Data = (uintptr_t)Con;
assert((X.Data & 7) == 0 &&"ContentCache pointer insufficiently aligned");
assert((unsigned)FileCharacter < 4 && "invalid file character");
X.Data |= (unsigned)FileCharacter;
return X;
}
SourceLocation getIncludeLoc() const {
return SourceLocation::getFromRawEncoding(IncludeLoc);
}
const ContentCache* getContentCache() const { return Content; }
const ContentCache* getContentCache() const {
return reinterpret_cast<const ContentCache*>(Data & ~7UL);
}
/// getCharacteristic - Return whether this is a system header or not.
CharacteristicKind getFileCharacteristic() const {
return (CharacteristicKind)FileCharacteristic;
return (CharacteristicKind)(Data & 3);
}
};