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Switch PTH format from a 7 byte magic number to an 8 byte one, to avoid

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misaligned reads throughout the file. Bump PTH format version to 10.

llvm-svn: 162076
This commit is contained in:
Richard Smith 2012-08-17 03:55:43 +00:00
parent 2fe6aab788
commit 2683b4c0fd
3 changed files with 5 additions and 5 deletions
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2
clang/include/clang/Lex/PTHManager.h
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@ -101,7 +101,7 @@ class PTHManager : public IdentifierInfoLookup {
public:
// The current PTH version.
enum { Version = 9 };
enum { Version = 10 };
~PTHManager();

2
clang/lib/Frontend/CacheTokens.cpp
View File

@ -447,7 +447,7 @@ Offset PTHWriter::EmitCachedSpellings() {
void PTHWriter::GeneratePTH(const std::string &MainFile) {
// Generate the prologue.
Out << "cfe-pth";
Out << "cfe-pth" << '\0';
Emit32(PTHManager::Version);
// Leave 4 words for the prologue.

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

@ -452,14 +452,14 @@ PTHManager *PTHManager::Create(const std::string &file,
const unsigned char *BufEnd = (unsigned char*)File->getBufferEnd();
// Check the prologue of the file.
if ((BufEnd - BufBeg) < (signed)(sizeof("cfe-pth") + 3 + 4) ||
memcmp(BufBeg, "cfe-pth", sizeof("cfe-pth") - 1) != 0) {
if ((BufEnd - BufBeg) < (signed)(sizeof("cfe-pth") + 4 + 4) ||
memcmp(BufBeg, "cfe-pth", sizeof("cfe-pth")) != 0) {
Diags.Report(diag::err_invalid_pth_file) << file;
return 0;
}
// Read the PTH version.
const unsigned char *p = BufBeg + (sizeof("cfe-pth") - 1);
const unsigned char *p = BufBeg + (sizeof("cfe-pth"));
unsigned Version = ReadLE32(p);
if (Version < PTHManager::Version) {