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PTH: 

- Encode the token length with 2 bytes instead of 4.
- This reduces the size of the .pth file for Cocoa.h by 12%.
- This speeds up PTH time (-Eonly) on Cocoa.h by 1.6%.

llvm-svn: 61364
This commit is contained in:
Ted Kremenek 2008-12-23 02:52:12 +00:00
parent 66076a964b
commit 1bd0a550d0
2 changed files with 10 additions and 6 deletions
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10
clang/Driver/CacheTokens.cpp
View File

@ -30,6 +30,10 @@ typedef uint32_t Offset;
typedef llvm::DenseMap<const FileEntry*,std::pair<Offset,Offset> > PCHMap;
typedef llvm::DenseMap<const IdentifierInfo*,uint32_t> IDMap;
static void Emit8(llvm::raw_ostream& Out, uint32_t V) {
Out << (unsigned char)(V);
}
static void Emit32(llvm::raw_ostream& Out, uint32_t V) {
Out << (unsigned char)(V);
Out << (unsigned char)(V >> 8);
@ -37,8 +41,10 @@ static void Emit32(llvm::raw_ostream& Out, uint32_t V) {
Out << (unsigned char)(V >> 24);
}
static void Emit8(llvm::raw_ostream& Out, uint32_t V) {
static void Emit16(llvm::raw_ostream& Out, uint32_t V) {
Out << (unsigned char)(V);
Out << (unsigned char)(V >> 8);
assert((V >> 16) == 0);
}
static void EmitBuf(llvm::raw_ostream& Out, const char* I, const char* E) {
@ -69,7 +75,7 @@ static void EmitToken(llvm::raw_ostream& Out, const Token& T,
Emit8(Out, T.getFlags());
Emit32(Out, ResolveID(IM, idcount, T.getIdentifierInfo()));
Emit32(Out, SMgr.getFullFilePos(T.getLocation()));
Emit32(Out, T.getLength());
Emit16(Out, T.getLength());
}
struct IDData {

6
clang/lib/Lex/PTHLexer.cpp
View File

@ -26,7 +26,7 @@
using namespace clang;
#define DISK_TOKEN_SIZE (2+3*4)
#define DISK_TOKEN_SIZE (2+4+4+2)
//===----------------------------------------------------------------------===//
// Utility methods for reading from the mmap'ed PTH file.
@ -79,9 +79,7 @@ LexNextToken:
| (((uint32_t) CurPtrShadow[9]) << 24);
uint32_t Len = ((uint32_t) CurPtrShadow[10])
| (((uint32_t) CurPtrShadow[11]) << 8)
| (((uint32_t) CurPtrShadow[12]) << 16)
| (((uint32_t) CurPtrShadow[13]) << 24);
| (((uint32_t) CurPtrShadow[11]) << 8);
CurPtr = (const char*) (CurPtrShadow + DISK_TOKEN_SIZE);