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globals.c
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/*
* globals.c: definition and handling of the set of global variables
* of the library
*
* See Copyright for the status of this software.
*
* Gary Pennington <[email protected]>
*/
#define IN_LIBXML
#include "libxml.h"
#include <stdlib.h>
#include <string.h>
#define XML_GLOBALS_NO_REDEFINITION
#include <libxml/globals.h>
#include <libxml/xmlerror.h>
#include <libxml/xmlmemory.h>
#include <libxml/xmlIO.h>
#include <libxml/parser.h>
#include <libxml/threads.h>
#include <libxml/tree.h>
#include <libxml/SAX.h>
#include <libxml/SAX2.h>
#include "private/dict.h"
#include "private/error.h"
#include "private/globals.h"
#include "private/threads.h"
#include "private/tree.h"
/*
* Mutex to protect "ForNewThreads" variables
*/
static xmlMutex xmlThrDefMutex;
/*
* Thread-local storage emulation.
*
* This works by replacing a global variable
*
* extern xmlError xmlLastError;
*
* with a macro that calls a function returning a pointer to the global in
* thread-local storage:
*
* xmlError *__xmlLastError(void);
* #define xmlError (*__xmlLastError());
*
* The code can operate in a multitude of ways depending on the environment.
* First we support POSIX and Windows threads. Then we support both
* thread-local storage provided by the compiler and older methods like
* thread-specific data (pthreads) or TlsAlloc (Windows).
*
* To clean up thread-local storage, we use thread-specific data on POSIX.
* On Windows, we either use DllMain when compiling a DLL or a registered
* wait function for static builds.
*
* Compiler TLS isn't really useful for now. It can make allocation more
* robust on some platforms but it also increases the memory consumption
* of each thread by ~250 bytes whether it uses libxml2 or not. The main
* problem is that we have to deallocate strings in xmlLastError and C
* offers no simple way to deallocate dynamic data in _Thread_local
* variables. In C++, one could simply use a thread_local variable with a
* destructor.
*
* At some point, many of the deprecated globals can be removed,
* although things like global error handlers will take a while.
* Ultimately, the only crucial things seem to be xmlLastError and
* RNG state. xmlLastError already involves dynamic allocation, so it
* could be allocated dynamically as well, only storing a global
* pointer.
*/
#ifdef LIBXML_THREAD_ENABLED
/*
* On Darwin, thread-local storage destructors seem to be run before
* pthread thread-specific data destructors. This causes ASan to
* report a use-after-free.
*
* On Windows, we can't use TLS in static builds. The RegisterWait
* callback would run after TLS was deallocated.
*/
#if defined(XML_THREAD_LOCAL) && \
!defined(__APPLE__) && \
!defined(USE_WAIT_DTOR)
#define USE_TLS
#endif
#ifdef HAVE_WIN32_THREADS
#if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL)
#define USE_WAIT_DTOR
#else
#define USE_DLL_MAIN
#endif
#endif
#define XML_DECLARE_MEMBER(name, type, attrs) \
type gs_##name;
struct _xmlGlobalState {
#ifdef USE_TLS
int initialized;
#endif
#ifdef USE_WAIT_DTOR
void *threadHandle;
void *waitHandle;
#endif
unsigned localRngState[2];
xmlError lastError;
#define XML_OP XML_DECLARE_MEMBER
XML_GLOBALS_ALLOC
XML_GLOBALS_PARSER
XML_GLOBALS_ERROR
XML_GLOBALS_TREE
XML_GLOBALS_IO
#undef XML_OP
};
#ifdef USE_TLS
static XML_THREAD_LOCAL xmlGlobalState globalState;
#endif
#ifdef HAVE_POSIX_THREADS
/*
* On POSIX, we need thread-specific data even with thread-local storage
* to destroy indirect references from global state (xmlLastError) at
* thread exit.
*/
static pthread_key_t globalkey;
#elif defined HAVE_WIN32_THREADS
#ifndef USE_TLS
static DWORD globalkey = TLS_OUT_OF_INDEXES;
#endif
#endif /* HAVE_WIN32_THREADS */
static void
xmlFreeGlobalState(void *state);
#endif /* LIBXML_THREAD_ENABLED */
/************************************************************************
* *
* All the user accessible global variables of the library *
* *
************************************************************************/
/*
* Memory allocation routines
*/
/**
* xmlFree:
* @mem: an already allocated block of memory
*
* The variable holding the libxml free() implementation
*/
xmlFreeFunc xmlFree = free;
/**
* xmlMalloc:
* @size: the size requested in bytes
*
* The variable holding the libxml malloc() implementation
*
* Returns a pointer to the newly allocated block or NULL in case of error
*/
xmlMallocFunc xmlMalloc = malloc;
/**
* xmlMallocAtomic:
* @size: the size requested in bytes
*
* The variable holding the libxml malloc() implementation for atomic
* data (i.e. blocks not containing pointers), useful when using a
* garbage collecting allocator.
*
* Returns a pointer to the newly allocated block or NULL in case of error
*/
xmlMallocFunc xmlMallocAtomic = malloc;
/**
* xmlRealloc:
* @mem: an already allocated block of memory
* @size: the new size requested in bytes
*
* The variable holding the libxml realloc() implementation
*
* Returns a pointer to the newly reallocated block or NULL in case of error
*/
xmlReallocFunc xmlRealloc = realloc;
/**
* xmlPosixStrdup
* @cur: the input char *
*
* a strdup implementation with a type signature matching POSIX
*
* Returns a new xmlChar * or NULL
*/
static char *
xmlPosixStrdup(const char *cur) {
return((char*) xmlCharStrdup(cur));
}
/**
* xmlMemStrdup:
* @str: a zero terminated string
*
* The variable holding the libxml strdup() implementation
*
* Returns the copy of the string or NULL in case of error
*/
xmlStrdupFunc xmlMemStrdup = xmlPosixStrdup;
/**
* xmlBufferAllocScheme:
*
* DEPRECATED: Don't use.
*
* Global setting, default allocation policy for buffers, default is
* XML_BUFFER_ALLOC_EXACT
*/
const xmlBufferAllocationScheme xmlBufferAllocScheme = XML_BUFFER_ALLOC_EXACT;
/**
* xmlDefaultBufferSize:
*
* DEPRECATED: Don't use.
*
* Global setting, default buffer size. Default value is BASE_BUFFER_SIZE
*/
const int xmlDefaultBufferSize = BASE_BUFFER_SIZE;
/*
* Parser defaults
*/
/**
* oldXMLWDcompatibility:
*
* DEPRECATED, always 0.
*/
const int oldXMLWDcompatibility = 0; /* DEPRECATED */
/**
* xmlParserDebugEntities:
*
* DEPRECATED, always 0.
*/
const int xmlParserDebugEntities = 0;
/**
* xmlDoValidityCheckingDefaultValue:
*
* DEPRECATED: Use the modern options API with XML_PARSE_DTDVALID.
*
* Global setting, indicate that the parser should work in validating mode.
* Disabled by default.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlDoValidityCheckingDefaultValue = 0;
#endif
static int xmlDoValidityCheckingDefaultValueThrDef = 0;
/**
* xmlGetWarningsDefaultValue:
*
* DEPRECATED: Use the modern options API with XML_PARSE_NOWARNING.
*
* Global setting, indicate that the DTD validation should provide warnings.
* Activated by default.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlGetWarningsDefaultValue = 1;
#endif
static int xmlGetWarningsDefaultValueThrDef = 1;
/**
* xmlLoadExtDtdDefaultValue:
*
* DEPRECATED: Use the modern options API with XML_PARSE_DTDLOAD.
*
* Global setting, indicate that the parser should load DTD while not
* validating.
* Disabled by default.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlLoadExtDtdDefaultValue = 0;
#endif
static int xmlLoadExtDtdDefaultValueThrDef = 0;
/**
* xmlPedanticParserDefaultValue:
*
* DEPRECATED: Use the modern options API with XML_PARSE_PEDANTIC.
*
* Global setting, indicate that the parser be pedantic
* Disabled by default.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlPedanticParserDefaultValue = 0;
#endif
static int xmlPedanticParserDefaultValueThrDef = 0;
/**
* xmlLineNumbersDefaultValue:
*
* DEPRECATED: The modern options API always enables line numbers.
*
* Global setting, indicate that the parser should store the line number
* in the content field of elements in the DOM tree.
* Disabled by default since this may not be safe for old classes of
* application.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlLineNumbersDefaultValue = 0;
#endif
static int xmlLineNumbersDefaultValueThrDef = 0;
/**
* xmlKeepBlanksDefaultValue:
*
* DEPRECATED: Use the modern options API with XML_PARSE_NOBLANKS.
*
* Global setting, indicate that the parser should keep all blanks
* nodes found in the content
* Activated by default, this is actually needed to have the parser
* conformant to the XML Recommendation, however the option is kept
* for some applications since this was libxml1 default behaviour.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlKeepBlanksDefaultValue = 1;
#endif
static int xmlKeepBlanksDefaultValueThrDef = 1;
/**
* xmlSubstituteEntitiesDefaultValue:
*
* DEPRECATED: Use the modern options API with XML_PARSE_NOENT.
*
* Global setting, indicate that the parser should not generate entity
* references but replace them with the actual content of the entity
* Disabled by default, this should be activated when using XPath since
* the XPath data model requires entities replacement and the XPath
* engine does not handle entities references transparently.
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlSubstituteEntitiesDefaultValue = 0;
#endif
static int xmlSubstituteEntitiesDefaultValueThrDef = 0;
/**
* xmlRegisterNodeDefaultValue:
*
* DEPRECATED: Don't use
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlRegisterNodeFunc xmlRegisterNodeDefaultValue = NULL;
#endif
static xmlRegisterNodeFunc xmlRegisterNodeDefaultValueThrDef = NULL;
/**
* xmlDeregisterNodeDefaultValue:
*
* DEPRECATED: Don't use
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlDeregisterNodeFunc xmlDeregisterNodeDefaultValue = NULL;
#endif
static xmlDeregisterNodeFunc xmlDeregisterNodeDefaultValueThrDef = NULL;
/**
* xmlParserInputBufferCreateFilenameValue:
*
* DEPRECATED: Don't use
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlParserInputBufferCreateFilenameFunc
xmlParserInputBufferCreateFilenameValue = NULL;
#endif
static xmlParserInputBufferCreateFilenameFunc
xmlParserInputBufferCreateFilenameValueThrDef = NULL;
/**
* xmlOutputBufferCreateFilenameValue:
*
* DEPRECATED: Don't use
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlOutputBufferCreateFilenameFunc xmlOutputBufferCreateFilenameValue = NULL;
#endif
static xmlOutputBufferCreateFilenameFunc
xmlOutputBufferCreateFilenameValueThrDef = NULL;
/**
* xmlGenericError:
*
* DEPRECATED: Use xmlCtxtSetErrorHandler.
*
* Global setting: function used for generic error callbacks
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlGenericErrorFunc xmlGenericError = xmlGenericErrorDefaultFunc;
#endif
static xmlGenericErrorFunc xmlGenericErrorThrDef = xmlGenericErrorDefaultFunc;
/**
* xmlStructuredError:
*
* DEPRECATED: Use xmlCtxtSetErrorHandler.
*
* Global setting: function used for structured error callbacks
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlStructuredErrorFunc xmlStructuredError = NULL;
#endif
static xmlStructuredErrorFunc xmlStructuredErrorThrDef = NULL;
/**
* xmlGenericErrorContext:
*
* DEPRECATED: Use xmlCtxtSetErrorHandler.
*
* Global setting passed to generic error callbacks
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
void *xmlGenericErrorContext = NULL;
#endif
static void *xmlGenericErrorContextThrDef = NULL;
/**
* xmlStructuredErrorContext:
*
* DEPRECATED: Use xmlCtxtSetErrorHandler.
*
* Global setting passed to structured error callbacks
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
void *xmlStructuredErrorContext = NULL;
#endif
static void *xmlStructuredErrorContextThrDef = NULL;
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
xmlError xmlLastError;
#endif
#ifdef LIBXML_OUTPUT_ENABLED
/*
* output defaults
*/
/**
* xmlIndentTreeOutput:
*
* DEPRECATED: Use XML_SAVE_INDENT and XML_SAVE_NO_INDENT.
*
* Global setting, asking the serializer to indent the output tree by default
* Enabled by default
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlIndentTreeOutput = 1;
#endif
static int xmlIndentTreeOutputThrDef = 1;
/**
* xmlTreeIndentString:
*
* DEPRECATED: Use xmlSaveSetIndentString.
*
* The string used to do one-level indent. By default is equal to
* " " (two spaces)
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
const char *xmlTreeIndentString = " ";
#endif
static const char *xmlTreeIndentStringThrDef = " ";
/**
* xmlSaveNoEmptyTags:
*
* DEPRECATED: Use XML_SAVE_EMPTY and XML_SAVE_NO_EMPTY.
*
* Global setting, asking the serializer to not output empty tags
* as <empty/> but <empty></empty>. those two forms are indistinguishable
* once parsed.
* Disabled by default
*/
#if !defined(LIBXML_THREAD_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
int xmlSaveNoEmptyTags = 0;
#endif
static int xmlSaveNoEmptyTagsThrDef = 0;
#endif /* LIBXML_OUTPUT_ENABLED */
#ifdef LIBXML_SAX1_ENABLED
/**
* xmlDefaultSAXHandler:
*
* DEPRECATED: This handler is unused and will be removed from future
* versions.
*
* Default SAX version1 handler for XML, builds the DOM tree
*/
const xmlSAXHandlerV1 xmlDefaultSAXHandler = {
xmlSAX2InternalSubset,
xmlSAX2IsStandalone,
xmlSAX2HasInternalSubset,
xmlSAX2HasExternalSubset,
xmlSAX2ResolveEntity,
xmlSAX2GetEntity,
xmlSAX2EntityDecl,
xmlSAX2NotationDecl,
xmlSAX2AttributeDecl,
xmlSAX2ElementDecl,
xmlSAX2UnparsedEntityDecl,
xmlSAX2SetDocumentLocator,
xmlSAX2StartDocument,
xmlSAX2EndDocument,
xmlSAX2StartElement,
xmlSAX2EndElement,
xmlSAX2Reference,
xmlSAX2Characters,
xmlSAX2Characters,
xmlSAX2ProcessingInstruction,
xmlSAX2Comment,
xmlParserWarning,
xmlParserError,
xmlParserError,
xmlSAX2GetParameterEntity,
xmlSAX2CDataBlock,
xmlSAX2ExternalSubset,
1,
};
#endif /* LIBXML_SAX1_ENABLED */
/**
* xmlDefaultSAXLocator:
*
* DEPRECATED: Don't use
*
* The default SAX Locator
* { getPublicId, getSystemId, getLineNumber, getColumnNumber}
*/
const xmlSAXLocator xmlDefaultSAXLocator = {
xmlSAX2GetPublicId,
xmlSAX2GetSystemId,
xmlSAX2GetLineNumber,
xmlSAX2GetColumnNumber
};
#if defined(LIBXML_HTML_ENABLED) && defined(LIBXML_SAX1_ENABLED)
/**
* htmlDefaultSAXHandler:
*
* DEPRECATED: This handler is unused and will be removed from future
* versions.
*
* Default old SAX v1 handler for HTML, builds the DOM tree
*/
const xmlSAXHandlerV1 htmlDefaultSAXHandler = {
xmlSAX2InternalSubset,
NULL,
NULL,
NULL,
NULL,
xmlSAX2GetEntity,
NULL,
NULL,
NULL,
NULL,
NULL,
xmlSAX2SetDocumentLocator,
xmlSAX2StartDocument,
xmlSAX2EndDocument,
xmlSAX2StartElement,
xmlSAX2EndElement,
NULL,
xmlSAX2Characters,
xmlSAX2IgnorableWhitespace,
xmlSAX2ProcessingInstruction,
xmlSAX2Comment,
xmlParserWarning,
xmlParserError,
xmlParserError,
NULL,
xmlSAX2CDataBlock,
NULL,
1,
};
#endif /* LIBXML_HTML_ENABLED */
/************************************************************************
* *
* Per thread global state handling *
* *
************************************************************************/
/**
* xmlInitGlobals:
*
* DEPRECATED: Alias for xmlInitParser.
*/
void xmlInitGlobals(void) {
xmlInitParser();
}
/**
* xmlInitGlobalsInternal:
*
* Additional initialisation for multi-threading
*/
void xmlInitGlobalsInternal(void) {
xmlInitMutex(&xmlThrDefMutex);
#ifdef HAVE_POSIX_THREADS
pthread_key_create(&globalkey, xmlFreeGlobalState);
#elif defined(HAVE_WIN32_THREADS)
#ifndef USE_TLS
if (globalkey == TLS_OUT_OF_INDEXES)
globalkey = TlsAlloc();
#endif
#endif
}
/**
* xmlCleanupGlobals:
*
* DEPRECATED: This function is a no-op. Call xmlCleanupParser
* to free global state but see the warnings there. xmlCleanupParser
* should be only called once at program exit. In most cases, you don't
* have call cleanup functions at all.
*/
void xmlCleanupGlobals(void) {
}
/**
* xmlCleanupGlobalsInternal:
*
* Additional cleanup for multi-threading
*/
void xmlCleanupGlobalsInternal(void) {
/*
* We assume that all other threads using the library have
* terminated and the last remaining thread calls
* xmlCleanupParser.
*/
#ifdef HAVE_POSIX_THREADS
/*
* Free thread-specific data of last thread before calling
* pthread_key_delete.
*/
xmlGlobalState *gs = pthread_getspecific(globalkey);
if (gs != NULL)
xmlFreeGlobalState(gs);
pthread_key_delete(globalkey);
#elif defined(HAVE_WIN32_THREADS)
#if defined(USE_WAIT_DTOR) && !defined(USE_TLS)
if (globalkey != TLS_OUT_OF_INDEXES) {
TlsFree(globalkey);
globalkey = TLS_OUT_OF_INDEXES;
}
#endif
#else /* no thread support */
xmlResetError(&xmlLastError);
#endif
xmlCleanupMutex(&xmlThrDefMutex);
}
/**
* xmlInitializeGlobalState:
* @gs: a pointer to a newly allocated global state
*
* DEPRECATED: No-op.
*/
void
xmlInitializeGlobalState(xmlGlobalStatePtr gs ATTRIBUTE_UNUSED)
{
}
/**
* xmlGetGlobalState:
*
* DEPRECATED
*
* Returns NULL.
*/
xmlGlobalStatePtr
xmlGetGlobalState(void)
{
return(NULL);
}
/**
* xmlIsMainThread:
*
* DEPRECATED: Internal function, do not use.
*
* Check whether the current thread is the main thread.
*
* Returns 1 if the current thread is the main thread, 0 otherwise
*/
int
xmlIsMainThread(void) {
return(0);
}
#ifdef LIBXML_THREAD_ENABLED
static void
xmlFreeGlobalState(void *state)
{
xmlGlobalState *gs = (xmlGlobalState *) state;
/*
* Free any memory allocated in the thread's xmlLastError. If it
* weren't for this indirect allocation, we wouldn't need
* a destructor with thread-local storage at all!
*
* It would be nice if we could make xmlLastError a special error
* type which uses statically allocated, fixed-size buffers.
* But the xmlError struct is fully public and widely used,
* so changes are dangerous.
*/
xmlResetError(&gs->lastError);
#ifndef USE_TLS
free(state);
#endif
}
#if defined(USE_WAIT_DTOR)
static void WINAPI
xmlGlobalStateDtor(void *ctxt, unsigned char timedOut ATTRIBUTE_UNUSED) {
xmlGlobalStatePtr gs = ctxt;
UnregisterWait(gs->waitHandle);
CloseHandle(gs->threadHandle);
xmlFreeGlobalState(gs);
}
static int
xmlRegisterGlobalStateDtor(xmlGlobalState *gs) {
void *processHandle = GetCurrentProcess();
void *threadHandle;
void *waitHandle;
if (DuplicateHandle(processHandle, GetCurrentThread(), processHandle,
&threadHandle, 0, FALSE, DUPLICATE_SAME_ACCESS) == 0) {
return(-1);
}
if (RegisterWaitForSingleObject(&waitHandle, threadHandle,
xmlGlobalStateDtor, gs, INFINITE, WT_EXECUTEONLYONCE) == 0) {
CloseHandle(threadHandle);
return(-1);
}
gs->threadHandle = threadHandle;
gs->waitHandle = waitHandle;
return(0);
}
#endif /* USE_WAIT_DTOR */
static void
xmlInitGlobalState(xmlGlobalStatePtr gs) {
gs->localRngState[0] = xmlGlobalRandom();
gs->localRngState[1] = xmlGlobalRandom();
memset(&gs->lastError, 0, sizeof(xmlError));
#ifdef LIBXML_THREAD_ALLOC_ENABLED
/* XML_GLOBALS_ALLOC */
gs->gs_xmlFree = free;
gs->gs_xmlMalloc = malloc;
gs->gs_xmlMallocAtomic = malloc;
gs->gs_xmlRealloc = realloc;
gs->gs_xmlMemStrdup = xmlPosixStrdup;
#endif
xmlMutexLock(&xmlThrDefMutex);
/* XML_GLOBALS_PARSER */
gs->gs_xmlDoValidityCheckingDefaultValue =
xmlDoValidityCheckingDefaultValueThrDef;
gs->gs_xmlGetWarningsDefaultValue = xmlGetWarningsDefaultValueThrDef;
gs->gs_xmlKeepBlanksDefaultValue = xmlKeepBlanksDefaultValueThrDef;
gs->gs_xmlLineNumbersDefaultValue = xmlLineNumbersDefaultValueThrDef;
gs->gs_xmlLoadExtDtdDefaultValue = xmlLoadExtDtdDefaultValueThrDef;
gs->gs_xmlPedanticParserDefaultValue = xmlPedanticParserDefaultValueThrDef;
gs->gs_xmlSubstituteEntitiesDefaultValue =
xmlSubstituteEntitiesDefaultValueThrDef;
#ifdef LIBXML_OUTPUT_ENABLED
gs->gs_xmlIndentTreeOutput = xmlIndentTreeOutputThrDef;
gs->gs_xmlTreeIndentString = xmlTreeIndentStringThrDef;
gs->gs_xmlSaveNoEmptyTags = xmlSaveNoEmptyTagsThrDef;
#endif
/* XML_GLOBALS_ERROR */
gs->gs_xmlGenericError = xmlGenericErrorThrDef;
gs->gs_xmlStructuredError = xmlStructuredErrorThrDef;
gs->gs_xmlGenericErrorContext = xmlGenericErrorContextThrDef;
gs->gs_xmlStructuredErrorContext = xmlStructuredErrorContextThrDef;
/* XML_GLOBALS_TREE */
gs->gs_xmlRegisterNodeDefaultValue = xmlRegisterNodeDefaultValueThrDef;
gs->gs_xmlDeregisterNodeDefaultValue = xmlDeregisterNodeDefaultValueThrDef;
/* XML_GLOBALS_IO */
gs->gs_xmlParserInputBufferCreateFilenameValue =
xmlParserInputBufferCreateFilenameValueThrDef;
gs->gs_xmlOutputBufferCreateFilenameValue =
xmlOutputBufferCreateFilenameValueThrDef;
xmlMutexUnlock(&xmlThrDefMutex);
#ifdef USE_TLS
gs->initialized = 1;
#endif
#ifdef HAVE_POSIX_THREADS
pthread_setspecific(globalkey, gs);
#elif defined HAVE_WIN32_THREADS
#ifndef USE_TLS
TlsSetValue(globalkey, gs);
#endif
#ifdef USE_WAIT_DTOR
xmlRegisterGlobalStateDtor(gs);
#endif
#endif
}
#ifndef USE_TLS
/**
* xmlNewGlobalState:
*
* xmlNewGlobalState() allocates a global state. This structure is used to
* hold all data for use by a thread when supporting backwards compatibility
* of libxml2 to pre-thread-safe behaviour.
*
* Returns the newly allocated xmlGlobalStatePtr or NULL in case of error
*/
static xmlGlobalStatePtr
xmlNewGlobalState(int allowFailure)
{
xmlGlobalState *gs;
/*
* We use malloc/free to allow accessing globals before setting
* custom memory allocators.
*/
gs = malloc(sizeof(xmlGlobalState));
if (gs == NULL) {
if (allowFailure)
return(NULL);
/*
* If an application didn't call xmlCheckThreadLocalStorage to make
* sure that global state could be allocated, it's too late to
* handle the error.
*/
xmlAbort("libxml2: Failed to allocate globals for thread\n"
"libxml2: See xmlCheckThreadLocalStorage\n");
}
memset(gs, 0, sizeof(xmlGlobalState));
xmlInitGlobalState(gs);
return (gs);
}
#endif
static xmlGlobalStatePtr
xmlGetThreadLocalStorage(int allowFailure) {
xmlGlobalState *gs;
(void) allowFailure;
xmlInitParser();
#ifdef USE_TLS
gs = &globalState;
if (gs->initialized == 0)
xmlInitGlobalState(gs);
#elif defined(HAVE_POSIX_THREADS)
gs = (xmlGlobalState *) pthread_getspecific(globalkey);
if (gs == NULL)
gs = xmlNewGlobalState(allowFailure);
#elif defined(HAVE_WIN32_THREADS)
gs = (xmlGlobalState *) TlsGetValue(globalkey);
if (gs == NULL)
gs = xmlNewGlobalState(allowFailure);
#else
gs = NULL;
#endif
return(gs);
}
/* Define thread-local storage accessors with macro magic */
#define XML_DEFINE_GLOBAL_WRAPPER(name, type, attrs) \
type *__##name(void) { \
return (&xmlGetThreadLocalStorage(0)->gs_##name); \
}
#define XML_OP XML_DEFINE_GLOBAL_WRAPPER
XML_GLOBALS_ALLOC
XML_GLOBALS_PARSER
XML_GLOBALS_ERROR
XML_GLOBALS_TREE
XML_GLOBALS_IO
#undef XML_OP
const xmlError *
__xmlLastError(void) {
return(&xmlGetThreadLocalStorage(0)->lastError);
}
/**
* xmlGetLocalRngState:
*
* Returns the local RNG state.
*/
unsigned *
xmlGetLocalRngState(void) {
return(xmlGetThreadLocalStorage(0)->localRngState);
}
/* For backward compatibility */
const char *const *
__xmlParserVersion(void) {
return &xmlParserVersion;
}
const int *
__oldXMLWDcompatibility(void) {
return &oldXMLWDcompatibility;
}
const int *
__xmlParserDebugEntities(void) {
return &xmlParserDebugEntities;
}
const xmlSAXLocator *
__xmlDefaultSAXLocator(void) {
return &xmlDefaultSAXLocator;
}
#ifdef LIBXML_SAX1_ENABLED
const xmlSAXHandlerV1 *
__xmlDefaultSAXHandler(void) {
return &xmlDefaultSAXHandler;
}
#ifdef LIBXML_HTML_ENABLED
const xmlSAXHandlerV1 *
__htmlDefaultSAXHandler(void) {
return &htmlDefaultSAXHandler;
}
#endif /* LIBXML_HTML_ENABLED */
#endif /* LIBXML_SAX1_ENABLED */
#endif /* LIBXML_THREAD_ENABLED */
/**
* xmlCheckThreadLocalStorage:
*
* Check whether thread-local storage could be allocated.
*
* In cross-platform code running in multithreaded environments, this
* function should be called once in each thread before calling other
* library functions to make sure that thread-local storage was
* allocated properly.
*
* Returns 0 on success or -1 if a memory allocation failed. A failed
* allocation signals a typically fatal and irrecoverable out-of-memory
* situation. Don't call any library functions in this case.
*
* Available since 2.12.0.
*/
int
xmlCheckThreadLocalStorage(void) {
#if defined(LIBXML_THREAD_ENABLED) && !defined(USE_TLS)
if (xmlGetThreadLocalStorage(1) == NULL)
return(-1);
#endif
return(0);
}
/**
* xmlGetLastErrorInternal:
*
* Returns a pointer to the global error struct.
*/
xmlError *
xmlGetLastErrorInternal(void) {
#ifdef LIBXML_THREAD_ENABLED
return(&xmlGetThreadLocalStorage(0)->lastError);
#else
return(&xmlLastError);
#endif
}
/** DOC_DISABLE */
/**