mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 05:29:24 +00:00
cleanup the MappedFile API and comments. This removes and updates
tons of out of date comments (really nothing throws here!) and fixes some other fairly glaring issues: "size" used to return the size of the file *and* change it, depending on how you called it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49009 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
328c84aa99
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540630f637
@ -28,145 +28,90 @@ namespace sys {
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/// for mapping a file into memory for both read and write access. This class
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/// does not provide facilities for finding the file or operating on paths to
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/// files. The sys::Path class is used for that.
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/// @since 1.4
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/// @brief An abstraction for memory mapped files.
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class MappedFile {
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/// @name Types
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/// @{
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sys::PathWithStatus Path; ///< Path to the file.
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unsigned Options; ///< Options used to create the mapping
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void *BasePtr; ///< Pointer to the base memory address
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mutable MappedFileInfo *MapInfo; ///< Platform specific info for the mapping
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MappedFile& operator=(const MappedFile &that); // DO NOT IMPLEMENT
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MappedFile(const MappedFile &that); // DO NOT IMPLEMENT
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public:
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enum MappingOptions {
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READ_ACCESS = 0x0001, ///< Map the file for reading
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WRITE_ACCESS = 0x0002, ///< Map the file for write access
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EXEC_ACCESS = 0x0004, ///< Map the file for execution access
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READ_ACCESS = 0x0001, ///< Map the file for reading
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WRITE_ACCESS = 0x0002, ///< Map the file for write access
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EXEC_ACCESS = 0x0004, ///< Map the file for execution access
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SHARED_MAPPING = 0x0008 ///< Map the file shared with other processes
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};
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/// @}
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/// @name Constructors
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/// @{
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public:
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/// Construct a MappedFile to the \p path in the operating system's file
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/// system with the mapping \p options provided.
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/// @throws std::string if an error occurs
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MappedFile() : path_(), options_(READ_ACCESS), base_(0), info_(0) {}
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MappedFile() : Options(READ_ACCESS), BasePtr(0), MapInfo(0) {}
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/// Destruct a MappedFile and release all memory associated with it.
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/// @throws std::string if an error occurs
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~MappedFile() { if (info_) terminate(); }
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~MappedFile() { close(); }
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public: // Accessors
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/// @}
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/// @name Accessors
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/// @{
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public:
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/// This function determines if the file is currently mapped or not.
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/// @returns true iff the file is mapped into memory, false otherwise
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/// @brief Determine if a MappedFile is currently mapped
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/// @throws nothing
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bool isMapped() const { return base_ != 0; }
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bool isMapped() const { return BasePtr != 0; }
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/// This function returns a void* pointer to the base address of the file
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/// mapping. This is the memory address of the first byte in the file.
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/// Note that although a non-const pointer is returned, the memory might
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/// not actually be writable, depending on the MappingOptions used when
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/// the MappedFile was opened.
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/// @returns The base pointer to the memory mapped file.
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/// @brief Obtain the base pointer to the memory mapped file.
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/// @throws nothing
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void* base() const { return base_; }
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void* base() const { return BasePtr; }
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/// This function returns a char* pointer to the base address of the file
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/// mapping. This is the memory address of the first byte in the file.
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/// Note that although a non-const pointer is returned, the memory might
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/// not actually be writable, depending on the MappingOptions used when
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/// the MappedFile was opened.
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/// @returns The base pointer to the memory mapped file as a char pointer.
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/// @brief Obtain the base pointer to the memory mapped file.
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/// @throws nothing
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char* charBase() const { return reinterpret_cast<char*>(base_); }
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char* charBase() const { return reinterpret_cast<char*>(BasePtr); }
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/// This function returns a reference to the sys::Path object kept by the
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/// MappedFile object. This contains the path to the file that is or
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/// will be mapped.
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/// @returns sys::Path containing the path name.
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/// @brief Returns the mapped file's path as a sys::Path
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/// @throws nothing
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const sys::Path& path() const { return path_; }
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const sys::Path& path() const { return Path; }
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/// This function returns the number of bytes in the file.
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/// @throws std::string if an error occurs
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size_t size() const;
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/// @}
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/// @name Mutators
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/// @{
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public:
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/// Open a file to be mapped and get its size but don't map it yet.
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/// @returns true if an error occurred
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bool open(
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const sys::Path& p, ///< Path to file to be mapped
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int options = READ_ACCESS, ///< Access mode for the mapping
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std::string* ErrMsg = 0 ///< Optional error string pointer
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) {
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path_ = p;
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options_ = options;
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public: // Mutators
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/// Open a file to be mapped and get its size but don't map it yet. Return
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/// true on error.
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bool open(const sys::Path &P, int options = READ_ACCESS,
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std::string *ErrMsg = 0) {
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Path = P;
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Options = options;
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return initialize(ErrMsg);
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}
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/// The mapped file is removed from memory. If the file was mapped for
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/// unmap - Remove the mapped file from memory. If the file was mapped for
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/// write access, the memory contents will be automatically synchronized
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/// with the file's disk contents.
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/// @brief Remove the file mapping from memory.
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void unmap();
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/// The mapped file is put into memory.
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/// @returns The base memory address of the mapped file or 0 if an error
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/// occurred.
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/// @brief Map the file into memory.
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void* map(
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std::string* ErrMsg = 0///< Optional error string pointer
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);
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/// map - Reserve space for the file, map it into memory, and return a
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/// pointer to it. This returns the base memory address of the mapped file
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/// or 0 if an error occurred.
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void *map(std::string* ErrMsg = 0);
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/// This method causes the size of the file, and consequently the size
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/// of the mapping to be set. This is logically the same as unmap(),
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/// resize - This method causes the size of the file, and consequently the
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/// size of the mapping to be set. This is logically the same as unmap(),
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/// adjust size of the file, map(). Consequently, when calling this
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/// function, the caller should not rely on previous results of the
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/// map(), base(), or baseChar() members as they may point to invalid
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/// areas of memory after this call.
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/// @throws std::string if an error occurs
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/// @brief Set the size of the file and memory mapping.
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bool size(size_t new_size, std::string* ErrMsg = 0);
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bool resize(size_t new_size, std::string *ErrMsg = 0);
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void close() { if (info_) terminate(); }
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void close() { if (MapInfo) terminate(); }
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/// @}
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/// @name Implementation
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/// @{
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private:
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/// @brief Initialize platform-specific portion
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bool initialize(std::string* ErrMsg);
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/// @brief Terminate platform-specific portion
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void terminate();
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/// @}
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/// @name Data
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/// @{
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private:
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sys::PathWithStatus path_; ///< Path to the file.
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int options_; ///< Options used to create the mapping
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void* base_; ///< Pointer to the base memory address
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mutable MappedFileInfo* info_; ///< Platform specific info for the mapping
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/// @}
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/// @name Disabled
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/// @{
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private:
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///< Disallow assignment
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MappedFile& operator=(const MappedFile &that);
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///< Disallow copying
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MappedFile(const MappedFile& that);
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/// @}
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bool initialize(std::string *ErrMsg);
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void terminate();
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};
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}
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}
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} // end namespace sys
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} // end namespace llvm
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#endif
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@ -31,105 +31,109 @@
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#include <sys/stat.h>
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#endif
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namespace llvm {
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using namespace llvm;
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using namespace sys;
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struct sys::MappedFileInfo {
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int FD;
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off_t Size;
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};
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namespace llvm {
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namespace sys {
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struct MappedFileInfo {
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int FD;
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off_t Size;
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};
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}
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}
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bool MappedFile::initialize(std::string* ErrMsg) {
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int mode = 0;
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if (options_ & READ_ACCESS)
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if (options_ & WRITE_ACCESS)
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if (Options & READ_ACCESS)
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if (Options & WRITE_ACCESS)
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mode = O_RDWR;
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else
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mode = O_RDONLY;
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else if (options_ & WRITE_ACCESS)
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else if (Options & WRITE_ACCESS)
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mode = O_WRONLY;
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int FD = ::open(path_.c_str(), mode);
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int FD = ::open(Path.c_str(), mode);
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if (FD < 0) {
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MakeErrMsg(ErrMsg, "can't open file '" + path_.toString() + "'");
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MakeErrMsg(ErrMsg, "can't open file '" + Path.toString() + "'");
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return true;
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}
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const FileStatus *Status = path_.getFileStatus(false, ErrMsg);
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const FileStatus *Status = Path.getFileStatus(false, ErrMsg);
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if (!Status) {
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::close(FD);
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return true;
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}
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info_ = new MappedFileInfo;
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info_->FD = FD;
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info_->Size = Status->getSize();
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MapInfo = new MappedFileInfo();
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MapInfo->FD = FD;
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MapInfo->Size = Status->getSize();
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return false;
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}
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void MappedFile::terminate() {
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assert(info_ && "MappedFile not initialized");
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::close(info_->FD);
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delete info_;
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info_ = 0;
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assert(MapInfo && "MappedFile not initialized");
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::close(MapInfo->FD);
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delete MapInfo;
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MapInfo = 0;
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}
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void MappedFile::unmap() {
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assert(info_ && "MappedFile not initialized");
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if (isMapped()) {
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if (options_ & WRITE_ACCESS)
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::msync(base_, info_->Size, MS_SYNC);
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::munmap(base_, info_->Size);
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base_ = 0; // Mark this as non-mapped.
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}
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assert(MapInfo && "MappedFile not initialized");
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if (!isMapped()) return;
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if (Options & WRITE_ACCESS)
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::msync(BasePtr, MapInfo->Size, MS_SYNC);
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::munmap(BasePtr, MapInfo->Size);
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BasePtr = 0; // Mark this as non-mapped.
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}
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void* MappedFile::map(std::string* ErrMsg) {
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assert(info_ && "MappedFile not initialized");
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if (!isMapped()) {
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int prot = PROT_NONE;
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int flags = 0;
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assert(MapInfo && "MappedFile not initialized");
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if (isMapped()) return BasePtr;
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int prot = PROT_NONE;
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int flags = 0;
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#ifdef MAP_FILE
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flags |= MAP_FILE;
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flags |= MAP_FILE;
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#endif
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if (options_ == 0) {
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prot = PROT_READ;
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flags = MAP_PRIVATE;
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} else {
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if (options_ & READ_ACCESS)
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prot |= PROT_READ;
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if (options_ & WRITE_ACCESS)
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prot |= PROT_WRITE;
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if (options_ & EXEC_ACCESS)
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prot |= PROT_EXEC;
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if (options_ & SHARED_MAPPING)
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flags |= MAP_SHARED;
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else
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flags |= MAP_PRIVATE;
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}
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size_t map_size = ((info_->Size / Process::GetPageSize())+1) *
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Process::GetPageSize();
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base_ = ::mmap(0, map_size, prot, flags, info_->FD, 0);
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if (base_ == MAP_FAILED) {
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MakeErrMsg(ErrMsg, "Can't map file:" + path_.toString());
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return 0;
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}
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if (Options == 0) {
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prot = PROT_READ;
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flags = MAP_PRIVATE;
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} else {
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if (Options & READ_ACCESS)
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prot |= PROT_READ;
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if (Options & WRITE_ACCESS)
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prot |= PROT_WRITE;
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if (Options & EXEC_ACCESS)
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prot |= PROT_EXEC;
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if (Options & SHARED_MAPPING)
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flags |= MAP_SHARED;
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else
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flags |= MAP_PRIVATE;
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}
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return base_;
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size_t map_size = ((MapInfo->Size / Process::GetPageSize())+1) *
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Process::GetPageSize();
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BasePtr = ::mmap(0, map_size, prot, flags, MapInfo->FD, 0);
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if (BasePtr == MAP_FAILED) {
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MakeErrMsg(ErrMsg, "Can't map file:" + Path.toString());
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return 0;
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}
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return BasePtr;
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}
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size_t MappedFile::size() const {
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assert(info_ && "MappedFile not initialized");
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return info_->Size;
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assert(MapInfo && "MappedFile not initialized");
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return MapInfo->Size;
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}
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bool MappedFile::size(size_t new_size, std::string* ErrMsg) {
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assert(info_ && "MappedFile not initialized");
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bool MappedFile::resize(size_t new_size, std::string* ErrMsg) {
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assert(MapInfo && "MappedFile not initialized");
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// Take the mapping out of memory
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this->unmap();
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unmap();
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// Adjust the current size to a page boundary
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size_t cur_size = ((info_->Size / Process::GetPageSize())+1) *
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size_t cur_size = ((MapInfo->Size / Process::GetPageSize())+1) *
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Process::GetPageSize();
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// Adjust the new_size to a page boundary
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@ -140,15 +144,12 @@ bool MappedFile::size(size_t new_size, std::string* ErrMsg) {
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if (new_size > cur_size) {
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// Ensure we can allocate at least the idodes necessary to handle the
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// file size requested.
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if ((off_t)-1 == ::lseek(info_->FD, new_size, SEEK_SET))
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if ((off_t)-1 == ::lseek(MapInfo->FD, new_size, SEEK_SET))
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return MakeErrMsg(ErrMsg, "Can't lseek: ");
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if (-1 == ::write(info_->FD, "\0", 1))
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if (-1 == ::write(MapInfo->FD, "\0", 1))
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return MakeErrMsg(ErrMsg, "Can't write: ");
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}
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// Put the mapping back into memory.
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return this->map(ErrMsg);
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return map(ErrMsg);
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}
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}
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@ -28,32 +28,32 @@ struct sys::MappedFileInfo {
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};
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bool MappedFile::initialize(std::string* ErrMsg) {
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assert(!info_);
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info_ = new MappedFileInfo;
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info_->hFile = INVALID_HANDLE_VALUE;
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info_->hMapping = NULL;
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assert(!MapInfo);
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MapInfo = new MappedFileInfo;
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MapInfo->hFile = INVALID_HANDLE_VALUE;
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MapInfo->hMapping = NULL;
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DWORD mode = options_ & WRITE_ACCESS ? GENERIC_WRITE : GENERIC_READ;
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DWORD disposition = options_ & WRITE_ACCESS ? OPEN_ALWAYS : OPEN_EXISTING;
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DWORD share = options_ & WRITE_ACCESS ? FILE_SHARE_WRITE : FILE_SHARE_READ;
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share = options_ & SHARED_MAPPING ? share : 0;
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info_->hFile = CreateFile(path_.c_str(), mode, share, NULL, disposition,
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DWORD mode = Options & WRITE_ACCESS ? GENERIC_WRITE : GENERIC_READ;
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DWORD disposition = Options & WRITE_ACCESS ? OPEN_ALWAYS : OPEN_EXISTING;
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DWORD share = Options & WRITE_ACCESS ? FILE_SHARE_WRITE : FILE_SHARE_READ;
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share = Options & SHARED_MAPPING ? share : 0;
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MapInfo->hFile = CreateFile(Path.c_str(), mode, share, NULL, disposition,
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FILE_ATTRIBUTE_NORMAL, NULL);
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if (info_->hFile == INVALID_HANDLE_VALUE) {
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delete info_;
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info_ = NULL;
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if (MapInfo->hFile == INVALID_HANDLE_VALUE) {
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delete MapInfo;
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MapInfo = NULL;
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return MakeErrMsg(ErrMsg,
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std::string("Can't open file: ") + path_.toString());
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std::string("Can't open file: ") + Path.toString());
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}
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LARGE_INTEGER size;
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if (!GetFileSizeEx(info_->hFile, &size) ||
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(info_->size = size_t(size.QuadPart), info_->size != size.QuadPart)) {
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CloseHandle(info_->hFile);
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delete info_;
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info_ = NULL;
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if (!GetFileSizeEx(MapInfo->hFile, &size) ||
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(MapInfo->size = size_t(size.QuadPart), MapInfo->size != size.QuadPart)) {
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CloseHandle(MapInfo->hFile);
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delete MapInfo;
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MapInfo = NULL;
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return MakeErrMsg(ErrMsg,
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std::string("Can't get size of file: ") + path_.toString());
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std::string("Can't get size of file: ") + Path.toString());
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}
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return false;
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@ -61,56 +61,56 @@ bool MappedFile::initialize(std::string* ErrMsg) {
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void MappedFile::terminate() {
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unmap();
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if (info_->hFile != INVALID_HANDLE_VALUE)
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CloseHandle(info_->hFile);
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delete info_;
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info_ = NULL;
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if (MapInfo->hFile != INVALID_HANDLE_VALUE)
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CloseHandle(MapInfo->hFile);
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delete MapInfo;
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MapInfo = NULL;
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}
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void MappedFile::unmap() {
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assert(info_ && "MappedFile not initialized");
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assert(MapInfo && "MappedFile not initialized");
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if (isMapped()) {
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UnmapViewOfFile(base_);
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base_ = NULL;
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UnmapViewOfFile(BasePtr);
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BasePtr = NULL;
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}
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if (info_->hMapping != INVALID_HANDLE_VALUE) {
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CloseHandle(info_->hMapping);
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info_->hMapping = NULL;
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if (MapInfo->hMapping != INVALID_HANDLE_VALUE) {
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CloseHandle(MapInfo->hMapping);
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MapInfo->hMapping = NULL;
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}
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}
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void* MappedFile::map(std::string* ErrMsg) {
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if (!isMapped()) {
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DWORD prot = PAGE_READONLY;
|
||||
if (options_ & EXEC_ACCESS)
|
||||
if (Options & EXEC_ACCESS)
|
||||
prot = SEC_IMAGE;
|
||||
else if (options_ & WRITE_ACCESS)
|
||||
else if (Options & WRITE_ACCESS)
|
||||
prot = PAGE_READWRITE;
|
||||
info_->hMapping = CreateFileMapping(info_->hFile, NULL, prot, 0, 0, NULL);
|
||||
if (info_->hMapping == NULL) {
|
||||
MakeErrMsg(ErrMsg, std::string("Can't map file: ") + path_.toString());
|
||||
MapInfo->hMapping = CreateFileMapping(MapInfo->hFile, NULL, prot, 0, 0, NULL);
|
||||
if (MapInfo->hMapping == NULL) {
|
||||
MakeErrMsg(ErrMsg, std::string("Can't map file: ") + Path.toString());
|
||||
return 0;
|
||||
}
|
||||
|
||||
prot = (options_ & WRITE_ACCESS) ? FILE_MAP_WRITE : FILE_MAP_READ;
|
||||
base_ = MapViewOfFileEx(info_->hMapping, prot, 0, 0, 0, NULL);
|
||||
if (base_ == NULL) {
|
||||
CloseHandle(info_->hMapping);
|
||||
info_->hMapping = NULL;
|
||||
MakeErrMsg(ErrMsg, std::string("Can't map file: ") + path_.toString());
|
||||
prot = (Options & WRITE_ACCESS) ? FILE_MAP_WRITE : FILE_MAP_READ;
|
||||
BasePtr = MapViewOfFileEx(MapInfo->hMapping, prot, 0, 0, 0, NULL);
|
||||
if (BasePtr == NULL) {
|
||||
CloseHandle(MapInfo->hMapping);
|
||||
MapInfo->hMapping = NULL;
|
||||
MakeErrMsg(ErrMsg, std::string("Can't map file: ") + Path.toString());
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return base_;
|
||||
return BasePtr;
|
||||
}
|
||||
|
||||
size_t MappedFile::size() const {
|
||||
assert(info_ && "MappedFile not initialized");
|
||||
return info_->size;
|
||||
assert(MapInfo && "MappedFile not initialized");
|
||||
return MapInfo->size;
|
||||
}
|
||||
|
||||
bool MappedFile::size(size_t new_size, std::string* ErrMsg) {
|
||||
assert(info_ && "MappedFile not initialized");
|
||||
bool MappedFile::resize(size_t new_size, std::string* ErrMsg) {
|
||||
assert(MapInfo && "MappedFile not initialized");
|
||||
|
||||
// Take the mapping out of memory.
|
||||
unmap();
|
||||
@ -120,16 +120,16 @@ bool MappedFile::size(size_t new_size, std::string* ErrMsg) {
|
||||
new_size = (new_size + pagesizem1) & ~pagesizem1;
|
||||
|
||||
// If the file needs to be extended, do so.
|
||||
if (new_size > info_->size) {
|
||||
if (new_size > MapInfo->size) {
|
||||
LARGE_INTEGER eof;
|
||||
eof.QuadPart = new_size;
|
||||
if (!SetFilePointerEx(info_->hFile, eof, NULL, FILE_BEGIN))
|
||||
if (!SetFilePointerEx(MapInfo->hFile, eof, NULL, FILE_BEGIN))
|
||||
return MakeErrMsg(ErrMsg,
|
||||
std::string("Can't set end of file: ") + path_.toString());
|
||||
if (!SetEndOfFile(info_->hFile))
|
||||
std::string("Can't set end of file: ") + Path.toString());
|
||||
if (!SetEndOfFile(MapInfo->hFile))
|
||||
return MakeErrMsg(ErrMsg,
|
||||
std::string("Can't set end of file: ") + path_.toString());
|
||||
info_->size = new_size;
|
||||
std::string("Can't set end of file: ") + Path.toString());
|
||||
MapInfo->size = new_size;
|
||||
}
|
||||
|
||||
// Remap the file.
|
||||
|
Loading…
Reference in New Issue
Block a user