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Differential D4033 Diff 10143 lib/Support/DynamicLibrary.cpp

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lib/Support/DynamicLibrary.cpp

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#include "llvm/Support/DynamicLibrary.h" #include "llvm/Support/DynamicLibrary.h"
#include "llvm-c/Support.h" #include "llvm-c/Support.h"
#include "llvm/ADT/DenseSet.h" #include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringMap.h" #include "llvm/ADT/StringMap.h"
#include "llvm/Config/config.h" #include "llvm/Config/config.h"
#include "llvm/Support/ManagedStatic.h" #include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h" #include "llvm/Support/Mutex.h"
#include "llvm/Support/MutexGuard.h"
#include <cstdio> #include <cstdio>
#include <cstring> #include <cstring>
// Collection of symbol name/value pairs to be searched prior to any libraries. // Collection of symbol name/value pairs to be searched prior to any libraries.
static llvm::ManagedStatic<llvm::StringMap<void *> > ExplicitSymbols; static llvm::ManagedStatic<llvm::StringMap<void *> > ExplicitSymbols;
static llvm::ManagedStatic<llvm::sys::SmartMutex<true> > SymbolsMutex; static llvm::ManagedStatic<llvm::sys::RecursiveDebugMutex> SymbolsMutex;
void llvm::sys::DynamicLibrary::AddSymbol(StringRef symbolName, void llvm::sys::DynamicLibrary::AddSymbol(StringRef symbolName,
void *symbolValue) { void *symbolValue) {
SmartScopedLock<true> lock(*SymbolsMutex); llvm::MutexGuard lock(*SymbolsMutex);
(*ExplicitSymbols)[symbolName] = symbolValue; (*ExplicitSymbols)[symbolName] = symbolValue;
} }
char llvm::sys::DynamicLibrary::Invalid = 0; char llvm::sys::DynamicLibrary::Invalid = 0;
#ifdef LLVM_ON_WIN32 #ifdef LLVM_ON_WIN32
#include "Windows/DynamicLibrary.inc" #include "Windows/DynamicLibrary.inc"
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//=== WARNING: Implementation here must contain only TRULY operating system //=== WARNING: Implementation here must contain only TRULY operating system
//=== independent code. //=== independent code.
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
static DenseSet<void *> *OpenedHandles = nullptr; static DenseSet<void *> *OpenedHandles = nullptr;
DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename, DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
std::string *errMsg) { std::string *errMsg) {
SmartScopedLock<true> lock(*SymbolsMutex); llvm::MutexGuard lock(*SymbolsMutex);
void *handle = dlopen(filename, RTLD_LAZY|RTLD_GLOBAL); void *handle = dlopen(filename, RTLD_LAZY|RTLD_GLOBAL);
if (!handle) { if (!handle) {
if (errMsg) *errMsg = dlerror(); if (errMsg) *errMsg = dlerror();
return DynamicLibrary(); return DynamicLibrary();
} }
#ifdef __CYGWIN__ #ifdef __CYGWIN__
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#endif #endif
namespace llvm { namespace llvm {
void *SearchForAddressOfSpecialSymbol(const char* symbolName); void *SearchForAddressOfSpecialSymbol(const char* symbolName);
} }
void* DynamicLibrary::SearchForAddressOfSymbol(const char *symbolName) { void* DynamicLibrary::SearchForAddressOfSymbol(const char *symbolName) {
SmartScopedLock<true> Lock(*SymbolsMutex); llvm::MutexGuard lock(*SymbolsMutex);
// First check symbols added via AddSymbol(). // First check symbols added via AddSymbol().
if (ExplicitSymbols.isConstructed()) { if (ExplicitSymbols.isConstructed()) {
StringMap<void *>::iterator i = ExplicitSymbols->find(symbolName); StringMap<void *>::iterator i = ExplicitSymbols->find(symbolName);
if (i != ExplicitSymbols->end()) if (i != ExplicitSymbols->end())
return i->second; return i->second;
} }
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