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//===- CXString.cpp - Routines for manipulating CXStrings -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines routines for manipulating CXStrings. It should be the
// only file that has internal knowledge of the encoding of the data in
// CXStrings.
//
//===----------------------------------------------------------------------===//
#include "CXString.h"
#include "CXTranslationUnit.h"
#include "clang-c/Index.h"
#include "clang/Frontend/ASTUnit.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
using namespace clang::cxstring;
/// Describes the kind of underlying data in CXString.
enum CXStringFlag {
/// CXString contains a 'const char *' that it doesn't own.
CXS_Unmanaged,
/// CXString contains a 'const char *' that it allocated with malloc().
CXS_Malloc,
/// CXString contains a CXStringBuf that needs to be returned to the
/// CXStringPool.
CXS_StringBuf
};
//===----------------------------------------------------------------------===//
// Basic generation of CXStrings.
//===----------------------------------------------------------------------===//
CXString cxstring::createEmpty() {
CXString Str;
Str.data = "";
Str.private_flags = CXS_Unmanaged;
return Str;
}
CXString cxstring::createNull() {
CXString Str;
Str.data = 0;
Str.private_flags = CXS_Unmanaged;
return Str;
}
CXString cxstring::createRef(const char *String) {
if (String && String[0] == '\0')
return cxstring::createEmpty();
CXString Str;
Str.data = String;
Str.private_flags = CXS_Unmanaged;
return Str;
}
CXString cxstring::createDup(const char *String) {
if (!String)
return cxstring::createNull();
if (String[0] == '\0')
return cxstring::createEmpty();
CXString Str;
Str.data = strdup(String);
Str.private_flags = CXS_Malloc;
return Str;
}
CXString cxstring::createCXString(StringRef String, bool DupString) {
CXString Result;
if (DupString || (!String.empty() && String.data()[String.size()] != 0)) {
char *Spelling = static_cast<char *>(malloc(String.size() + 1));
memmove(Spelling, String.data(), String.size());
Spelling[String.size()] = 0;
Result.data = Spelling;
Result.private_flags = (unsigned) CXS_Malloc;
} else {
Result.data = String.data();
Result.private_flags = (unsigned) CXS_Unmanaged;
}
return Result;
}
CXString cxstring::createCXString(CXStringBuf *buf) {
CXString Str;
Str.data = buf;
Str.private_flags = (unsigned) CXS_StringBuf;
return Str;
}
//===----------------------------------------------------------------------===//
// String pools.
//===----------------------------------------------------------------------===//
cxstring::CXStringPool::~CXStringPool() {
for (std::vector<CXStringBuf *>::iterator I = Pool.begin(), E = Pool.end();
I != E; ++I) {
delete *I;
}
}
CXStringBuf *cxstring::CXStringPool::getCXStringBuf(CXTranslationUnit TU) {
if (Pool.empty())
return new CXStringBuf(TU);
CXStringBuf *Buf = Pool.back();
Buf->Data.clear();
Pool.pop_back();
return Buf;
}
CXStringBuf *cxstring::getCXStringBuf(CXTranslationUnit TU) {
return TU->StringPool->getCXStringBuf(TU);
}
void cxstring::CXStringBuf::dispose() {
TU->StringPool->Pool.push_back(this);
}
bool cxstring::isManagedByPool(CXString str) {
return ((CXStringFlag) str.private_flags) == CXS_StringBuf;
}
//===----------------------------------------------------------------------===//
// libClang public APIs.
//===----------------------------------------------------------------------===//
extern "C" {
const char *clang_getCString(CXString string) {
if (string.private_flags == (unsigned) CXS_StringBuf) {
return static_cast<const CXStringBuf *>(string.data)->Data.data();
}
return static_cast<const char *>(string.data);
}
void clang_disposeString(CXString string) {
switch ((CXStringFlag) string.private_flags) {
case CXS_Unmanaged:
break;
case CXS_Malloc:
if (string.data)
free(const_cast<void *>(string.data));
break;
case CXS_StringBuf:
static_cast<CXStringBuf *>(
const_cast<void *>(string.data))->dispose();
break;
}
}
} // end: extern "C"
|
