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[Basic] Use a bitfield in SLocEntry for clarity. NFC. 

llvm-svn: 253177
This commit is contained in:
Vedant Kumar 2015-11-16 00:11:58 +00:00
parent 1d4058322d
commit a52fa8efe6
1 changed files with 10 additions and 5 deletions
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15
clang/include/clang/Basic/SourceManager.h
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@ -388,15 +388,16 @@ namespace SrcMgr {
/// SourceManager keeps an array of these objects, and they are uniquely
/// identified by the FileID datatype.
class SLocEntry {
unsigned Offset; // low bit is set for expansion info.
unsigned Offset : 31;
unsigned IsExpansion : 1;
union {
FileInfo File;
ExpansionInfo Expansion;
};
public:
unsigned getOffset() const { return Offset >> 1; }
unsigned getOffset() const { return Offset; }
bool isExpansion() const { return Offset & 1; }
bool isExpansion() const { return IsExpansion; }
bool isFile() const { return !isExpansion(); }
const FileInfo &getFile() const {
@ -410,15 +411,19 @@ namespace SrcMgr {
}
static SLocEntry get(unsigned Offset, const FileInfo &FI) {
assert(!(Offset & (1 << 31)) && "Offset is too large");
SLocEntry E;
E.Offset = Offset << 1;
E.Offset = Offset;
E.IsExpansion = false;
E.File = FI;
return E;
}
static SLocEntry get(unsigned Offset, const ExpansionInfo &Expansion) {
assert(!(Offset & (1 << 31)) && "Offset is too large");
SLocEntry E;
E.Offset = (Offset << 1) | 1;
E.Offset = Offset;
E.IsExpansion = true;
E.Expansion = Expansion;
return E;
}