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//===- CXString.cpp - Routines for manipulating CXStrings -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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/Support/ErrorHandling.h"
using namespace clang;
/// 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
};
namespace clang {
namespace cxstring {
//===----------------------------------------------------------------------===//
// Basic generation of CXStrings.
//===----------------------------------------------------------------------===//
CXString createEmpty() {
CXString Str;
Str.data = "";
Str.private_flags = CXS_Unmanaged;
return Str;
}
CXString createNull() {
CXString Str;
Str.data = nullptr;
Str.private_flags = CXS_Unmanaged;
return Str;
}
CXString createRef(const char *String) {
if (String && String[0] == '\0')
return createEmpty();
CXString Str;
Str.data = String;
Str.private_flags = CXS_Unmanaged;
return Str;
}
CXString createDup(const char *String) {
if (!String)
return createNull();
if (String[0] == '\0')
return createEmpty();
CXString Str;
Str.data = strdup(String);
Str.private_flags = CXS_Malloc;
return Str;
}
CXString createRef(StringRef String) {
if (!String.data())
return createNull();
// If the string is empty, it might point to a position in another string
// while having zero length. Make sure we don't create a reference to the
// larger string.
if (String.empty())
return createEmpty();
// If the string is not nul-terminated, we have to make a copy.
// FIXME: This is doing a one past end read, and should be removed! For memory
// we don't manage, the API string can become unterminated at any time outside
// our control.
if (String.data()[String.size()] != 0)
return createDup(String);
CXString Result;
Result.data = String.data();
Result.private_flags = (unsigned) CXS_Unmanaged;
return Result;
}
CXString createDup(StringRef String) {
CXString Result;
char *Spelling = static_cast<char *>(llvm::safe_malloc(String.size() + 1));
memmove(Spelling, String.data(), String.size());
Spelling[String.size()] = 0;
Result.data = Spelling;
Result.private_flags = (unsigned) CXS_Malloc;
return Result;
}
CXString createCXString(CXStringBuf *buf) {
CXString Str;
Str.data = buf;
Str.private_flags = (unsigned) CXS_StringBuf;
return Str;
}
CXStringSet *createSet(const std::vector<std::string> &Strings) {
CXStringSet *Set = new CXStringSet;
Set->Count = Strings.size();
Set->Strings = new CXString[Set->Count];
for (unsigned SI = 0, SE = Set->Count; SI < SE; ++SI)
Set->Strings[SI] = createDup(Strings[SI]);
return Set;
}
//===----------------------------------------------------------------------===//
// String pools.
//===----------------------------------------------------------------------===//
CXStringPool::~CXStringPool() {
for (std::vector<CXStringBuf *>::iterator I = Pool.begin(), E = Pool.end();
I != E; ++I) {
delete *I;
}
}
CXStringBuf *CXStringPool::getCXStringBuf(CXTranslationUnit TU) {
if (Pool.empty())
return new CXStringBuf(TU);
CXStringBuf *Buf = Pool.back();
Buf->Data.clear();
Pool.pop_back();
return Buf;
}
CXStringBuf *getCXStringBuf(CXTranslationUnit TU) {
return TU->StringPool->getCXStringBuf(TU);
}
void CXStringBuf::dispose() {
TU->StringPool->Pool.push_back(this);
}
bool isManagedByPool(CXString str) {
return ((CXStringFlag) str.private_flags) == CXS_StringBuf;
}
} // end namespace cxstring
} // end namespace clang
//===----------------------------------------------------------------------===//
// libClang public APIs.
//===----------------------------------------------------------------------===//
const char *clang_getCString(CXString string) {
if (string.private_flags == (unsigned) CXS_StringBuf) {
return static_cast<const cxstring::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<cxstring::CXStringBuf *>(
const_cast<void *>(string.data))->dispose();
break;
}
}
void clang_disposeStringSet(CXStringSet *set) {
for (unsigned SI = 0, SE = set->Count; SI < SE; ++SI)
clang_disposeString(set->Strings[SI]);
delete[] set->Strings;
delete set;
}
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