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remove dead code, noone creates instances of "DynamicLibrary", so the ctor and dtor are dead.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-07-07 18:01:58 +00:00
parent ddb03d831b
commit 72501b4a21
2 changed files with 31 additions and 67 deletions
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87
include/llvm/System/DynamicLibrary.h
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@ -14,7 +14,6 @@
#ifndef LLVM_SYSTEM_DYNAMIC_LIBRARY_H
#define LLVM_SYSTEM_DYNAMIC_LIBRARY_H
#include "llvm/System/Path.h"
#include <string>
namespace llvm {
@ -30,66 +29,40 @@ namespace sys {
/// but rather the main program itself, useful on Windows where the main
/// executable cannot be searched.
class DynamicLibrary {
/// @name Constructors
/// @{
public:
/// Construct a DynamicLibrary that represents the currently executing
/// program. The program must have been linked with -export-dynamic or
/// -dlopen self for this to work.
/// @throws std::string indicating why the program couldn't be opened.
/// @brief Open program as dynamic library.
DynamicLibrary();
DynamicLibrary(); // DO NOT IMPLEMENT
public:
/// This function allows a library to be loaded without instantiating a
/// DynamicLibrary object. Consequently, it is marked as being permanent
/// and will only be unloaded when the program terminates. This returns
/// false on success or returns true and fills in *ErrMsg on failure.
/// @brief Open a dynamic library permanently.
static bool LoadLibraryPermanently(const char *filename,
std::string *ErrMsg = 0);
/// After destruction, the symbols of the library will no longer be
/// available to the program.
/// @brief Closes the DynamicLibrary
~DynamicLibrary();
/// This function will search through all previously loaded dynamic
/// libraries for the symbol \p symbolName. If it is found, the addressof
/// that symbol is returned. If not, null is returned. Note that this will
/// search permanently loaded libraries (LoadLibraryPermanently) as well
/// as ephemerally loaded libraries (constructors).
/// @throws std::string on error.
/// @brief Search through libraries for address of a symbol
static void *SearchForAddressOfSymbol(const char *symbolName);
/// @}
/// @name Functions
/// @{
public:
/// This function allows a library to be loaded without instantiating a
/// DynamicLibrary object. Consequently, it is marked as being permanent
/// and will only be unloaded when the program terminates. This returns
/// false on success or returns true and fills in *ErrMsg on failure.
/// @brief Open a dynamic library permanently.
static bool LoadLibraryPermanently(const char* filename,
std::string *ErrMsg = 0);
/// @brief Convenience function for C++ophiles.
static void *SearchForAddressOfSymbol(const std::string &symbolName) {
return SearchForAddressOfSymbol(symbolName.c_str());
}
/// This function will search through all previously loaded dynamic
/// libraries for the symbol \p symbolName. If it is found, the addressof
/// that symbol is returned. If not, null is returned. Note that this will
/// search permanently loaded libraries (LoadLibraryPermanently) as well
/// as ephemerally loaded libraries (constructors).
/// @throws std::string on error.
/// @brief Search through libraries for address of a symbol
static void* SearchForAddressOfSymbol(const char* symbolName);
/// This functions permanently adds the symbol \p symbolName with the
/// value \p symbolValue. These symbols are searched before any
/// libraries.
/// @brief Add searchable symbol/value pair.
static void AddSymbol(const char *symbolName, void *symbolValue);
/// @brief Convenience function for C++ophiles.
static void* SearchForAddressOfSymbol(const std::string& symbolName) {
return SearchForAddressOfSymbol(symbolName.c_str());
}
/// This functions permanently adds the symbol \p symbolName with the
/// value \p symbolValue. These symbols are searched before any
/// libraries.
/// @brief Add searchable symbol/value pair.
static void AddSymbol(const char* symbolName, void *symbolValue);
/// @brief Convenience function for C++ophiles.
static void AddSymbol(const std::string& symbolName, void *symbolValue) {
AddSymbol(symbolName.c_str(), symbolValue);
}
/// @}
/// @name Implementation
/// @{
protected:
void* handle; // Opaque handle for information about the library
DynamicLibrary(const DynamicLibrary&); ///< Do not implement
DynamicLibrary& operator=(const DynamicLibrary&); ///< Do not implement
/// @}
/// @brief Convenience function for C++ophiles.
static void AddSymbol(const std::string &symbolName, void *symbolValue) {
AddSymbol(symbolName.c_str(), symbolValue);
}
};
} // End sys namespace

11
lib/System/DynamicLibrary.cpp
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@ -18,6 +18,7 @@
#include <cstdio>
#include <cstring>
#include <map>
#include <vector>
// Collection of symbol name/value pairs to be searched prior to any libraries.
static std::map<std::string, void*> symbols;
@ -47,16 +48,6 @@ using namespace llvm::sys;
static std::vector<void *> OpenedHandles;
DynamicLibrary::DynamicLibrary() {}
DynamicLibrary::~DynamicLibrary() {
SmartScopedWriter<true> Writer(&SymbolsLock);
while(!OpenedHandles.empty()) {
void *H = OpenedHandles.back();
OpenedHandles.pop_back();
dlclose(H);
}
}
bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
std::string *ErrMsg) {