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instead of throwing an exception. This reduces the amount of code that is exposed to exceptions (e.g. FileUtilities), though it is clearly only one step along the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29395 91177308-0d34-0410-b5e6-96231b3b80d8
556 lines
26 KiB
C++
556 lines
26 KiB
C++
//===-- llvm/Bytecode/Archive.h - LLVM Bytecode Archive ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header file declares the Archive and ArchiveMember classes that provide
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// manipulation of LLVM Archive files. The implementation is provided by the
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// lib/Bytecode/Archive library. This library is used to read and write
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// archive (*.a) files that contain LLVM bytecode files (or others).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BYTECODE_ARCHIVE_H
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#define LLVM_BYTECODE_ARCHIVE_H
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#include "llvm/ADT/ilist"
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#include "llvm/System/Path.h"
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#include "llvm/System/MappedFile.h"
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#include <map>
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#include <set>
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#include <fstream>
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namespace llvm {
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// Forward declare classes
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class ModuleProvider; // From VMCore
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class Module; // From VMCore
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class Archive; // Declared below
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class ArchiveMemberHeader; // Internal implementation class
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/// This class is the main class manipulated by users of the Archive class. It
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/// holds information about one member of the Archive. It is also the element
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/// stored by the Archive's ilist, the Archive's main abstraction. Because of
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/// the special requirements of archive files, users are not permitted to
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/// construct ArchiveMember instances. You should obtain them from the methods
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/// of the Archive class instead.
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/// @brief This class represents a single archive member.
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class ArchiveMember {
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/// @name Types
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/// @{
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public:
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/// These flags are used internally by the archive member to specify various
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/// characteristics of the member. The various "is" methods below provide
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/// access to the flags. The flags are not user settable.
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enum Flags {
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CompressedFlag = 1, ///< Member is a normal compressed file
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SVR4SymbolTableFlag = 2, ///< Member is a SVR4 symbol table
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BSD4SymbolTableFlag = 4, ///< Member is a BSD4 symbol table
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LLVMSymbolTableFlag = 8, ///< Member is an LLVM symbol table
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BytecodeFlag = 16, ///< Member is uncompressed bytecode
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CompressedBytecodeFlag = 32, ///< Member is compressed bytecode
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HasPathFlag = 64, ///< Member has a full or partial path
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HasLongFilenameFlag = 128, ///< Member uses the long filename syntax
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StringTableFlag = 256 ///< Member is an ar(1) format string table
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};
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/// @}
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/// @name Accessors
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/// @{
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public:
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/// @returns the parent Archive instance
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/// @brief Get the archive associated with this member
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Archive* getArchive() const { return parent; }
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/// @returns the path to the Archive's file
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/// @brief Get the path to the archive member
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const sys::Path& getPath() const { return path; }
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/// The "user" is the owner of the file per Unix security. This may not
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/// have any applicability on non-Unix systems but is a required component
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/// of the "ar" file format.
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/// @brief Get the user associated with this archive member.
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unsigned getUser() const { return info.getUser(); }
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/// The "group" is the owning group of the file per Unix security. This
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/// may not have any applicability on non-Unix systems but is a required
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/// component of the "ar" file format.
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/// @brief Get the group associated with this archive member.
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unsigned getGroup() const { return info.getGroup(); }
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/// The "mode" specifies the access permissions for the file per Unix
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/// security. This may not have any applicabiity on non-Unix systems but is
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/// a required component of the "ar" file format.
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/// @brief Get the permission mode associated with this archive member.
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unsigned getMode() const { return info.getMode(); }
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/// This method returns the time at which the archive member was last
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/// modified when it was not in the archive.
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/// @brief Get the time of last modification of the archive member.
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sys::TimeValue getModTime() const { return info.getTimestamp(); }
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/// @returns the size of the archive member in bytes.
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/// @brief Get the size of the archive member.
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unsigned getSize() const { return info.getSize(); }
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/// This method returns the total size of the archive member as it
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/// appears on disk. This includes the file content, the header, the
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/// long file name if any, and the padding.
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/// @brief Get total on-disk member size.
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unsigned getMemberSize() const;
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/// This method will return a pointer to the in-memory content of the
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/// archive member, if it is available. If the data has not been loaded
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/// into memory, the return value will be null.
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/// @returns a pointer to the member's data.
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/// @brief Get the data content of the archive member
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const void* getData() const { return data; }
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/// This method determines if the member is a regular compressed file. Note
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/// that compressed bytecode files will yield "false" for this method.
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/// @see isCompressedBytecode()
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/// @returns true iff the archive member is a compressed regular file.
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/// @brief Determine if the member is a compressed regular file.
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bool isCompressed() const { return flags&CompressedFlag; }
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/// @returns true iff the member is a SVR4 (non-LLVM) symbol table
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/// @brief Determine if this member is a SVR4 symbol table.
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bool isSVR4SymbolTable() const { return flags&SVR4SymbolTableFlag; }
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/// @returns true iff the member is a BSD4.4 (non-LLVM) symbol table
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/// @brief Determine if this member is a BSD4.4 symbol table.
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bool isBSD4SymbolTable() const { return flags&BSD4SymbolTableFlag; }
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/// @returns true iff the archive member is the LLVM symbol table
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/// @brief Determine if this member is the LLVM symbol table.
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bool isLLVMSymbolTable() const { return flags&LLVMSymbolTableFlag; }
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/// @returns true iff the archive member is the ar(1) string table
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/// @brief Determine if this member is the ar(1) string table.
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bool isStringTable() const { return flags&StringTableFlag; }
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/// @returns true iff the archive member is an uncompressed bytecode file.
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/// @brief Determine if this member is a bytecode file.
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bool isBytecode() const { return flags&BytecodeFlag; }
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/// @returns true iff the archive member is a compressed bytecode file.
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/// @brief Determine if the member is a compressed bytecode file.
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bool isCompressedBytecode() const { return flags&CompressedBytecodeFlag;}
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/// @returns true iff the file name contains a path (directory) component.
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/// @brief Determine if the member has a path
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bool hasPath() const { return flags&HasPathFlag; }
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/// Long filenames are an artifact of the ar(1) file format which allows
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/// up to sixteen characters in its header and doesn't allow a path
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/// separator character (/). To avoid this, a "long format" member name is
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/// allowed that doesn't have this restriction. This method determines if
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/// that "long format" is used for this member.
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/// @returns true iff the file name uses the long form
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/// @brief Determin if the member has a long file name
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bool hasLongFilename() const { return flags&HasLongFilenameFlag; }
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/// This method returns the status info (like Unix stat(2)) for the archive
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/// member. The status info provides the file's size, permissions, and
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/// modification time. The contents of the Path::StatusInfo structure, other
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/// than the size and modification time, may not have utility on non-Unix
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/// systems.
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/// @returns the status info for the archive member
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/// @brief Obtain the status info for the archive member
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const sys::FileStatus &getFileStatus() const { return info; }
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/// This method causes the archive member to be replaced with the contents
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/// of the file specified by \p File. The contents of \p this will be
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/// updated to reflect the new data from \p File. The \p File must exist and
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/// be readable on entry to this method.
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/// @brief Replace contents of archive member with a new file.
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void replaceWith(const sys::Path &aFile);
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/// @}
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/// @name ilist methods - do not use
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/// @{
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public:
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const ArchiveMember *getNext() const { return next; }
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const ArchiveMember *getPrev() const { return prev; }
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ArchiveMember *getNext() { return next; }
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ArchiveMember *getPrev() { return prev; }
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void setPrev(ArchiveMember* p) { prev = p; }
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void setNext(ArchiveMember* n) { next = n; }
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/// @}
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/// @name Data
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/// @{
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private:
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ArchiveMember* next; ///< Pointer to next archive member
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ArchiveMember* prev; ///< Pointer to previous archive member
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Archive* parent; ///< Pointer to parent archive
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sys::Path path; ///< Path of file containing the member
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sys::FileStatus info; ///< Status info (size,mode,date)
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unsigned flags; ///< Flags about the archive member
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const void* data; ///< Data for the member
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/// @}
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/// @name Constructors
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/// @{
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public:
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/// The default constructor is only used by the Archive's iplist when it
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/// constructs the list's sentry node.
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ArchiveMember();
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private:
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/// Used internally by the Archive class to construct an ArchiveMember.
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/// The contents of the ArchiveMember are filled out by the Archive class.
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ArchiveMember(Archive *PAR);
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// So Archive can construct an ArchiveMember
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friend class llvm::Archive;
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/// @}
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};
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/// This class defines the interface to LLVM Archive files. The Archive class
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/// presents the archive file as an ilist of ArchiveMember objects. The members
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/// can be rearranged in any fashion either by directly editing the ilist or by
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/// using editing methods on the Archive class (recommended). The Archive
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/// class also provides several ways of accessing the archive file for various
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/// purposes such as editing and linking. Full symbol table support is provided
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/// for loading only those files that resolve symbols. Note that read
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/// performance of this library is _crucial_ for performance of JIT type
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/// applications and the linkers. Consequently, the implementation of the class
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/// is optimized for reading.
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class Archive {
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/// @name Types
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/// @{
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public:
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/// This is the ilist type over which users may iterate to examine
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/// the contents of the archive
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/// @brief The ilist type of ArchiveMembers that Archive contains.
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typedef iplist<ArchiveMember> MembersList;
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/// @brief Forward mutable iterator over ArchiveMember
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typedef MembersList::iterator iterator;
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/// @brief Forward immutable iterator over ArchiveMember
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typedef MembersList::const_iterator const_iterator;
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/// @brief Reverse mutable iterator over ArchiveMember
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typedef std::reverse_iterator<iterator> reverse_iterator;
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/// @brief Reverse immutable iterator over ArchiveMember
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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/// @brief The in-memory version of the symbol table
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typedef std::map<std::string,unsigned> SymTabType;
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/// @}
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/// @name ilist accessor methods
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/// @{
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public:
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inline iterator begin() { return members.begin(); }
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inline const_iterator begin() const { return members.begin(); }
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inline iterator end () { return members.end(); }
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inline const_iterator end () const { return members.end(); }
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inline reverse_iterator rbegin() { return members.rbegin(); }
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inline const_reverse_iterator rbegin() const { return members.rbegin(); }
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inline reverse_iterator rend () { return members.rend(); }
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inline const_reverse_iterator rend () const { return members.rend(); }
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inline unsigned size() const { return members.size(); }
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inline bool empty() const { return members.empty(); }
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inline const ArchiveMember& front() const { return members.front(); }
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inline ArchiveMember& front() { return members.front(); }
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inline const ArchiveMember& back() const { return members.back(); }
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inline ArchiveMember& back() { return members.back(); }
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/// @}
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/// @name ilist mutator methods
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/// @{
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public:
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/// This method splices a \p src member from an archive (possibly \p this),
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/// to a position just before the member given by \p dest in \p this. When
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/// the archive is written, \p src will be written in its new location.
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/// @brief Move a member to a new location
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inline void splice(iterator dest, Archive& arch, iterator src)
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{ return members.splice(dest,arch.members,src); }
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/// This method erases a \p target member from the archive. When the
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/// archive is written, it will no longer contain \p target. The associated
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/// ArchiveMember is deleted.
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/// @brief Erase a member.
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inline iterator erase(iterator target) { return members.erase(target); }
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/// @}
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/// @name Constructors
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/// @{
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public:
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/// Create an empty archive file and associate it with the \p Filename. This
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/// method does not actually create the archive disk file. It creates an
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/// empty Archive object. If the writeToDisk method is called, the archive
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/// file \p Filename will be created at that point, with whatever content
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/// the returned Archive object has at that time.
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/// @returns An Archive* that represents the new archive file.
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/// @brief Create an empty Archive.
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static Archive* CreateEmpty(
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const sys::Path& Filename ///< Name of the archive to (eventually) create.
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);
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/// Open an existing archive and load its contents in preparation for
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/// editing. After this call, the member ilist is completely populated based
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/// on the contents of the archive file. You should use this form of open if
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/// you intend to modify the archive or traverse its contents (e.g. for
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/// printing).
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/// @brief Open and load an archive file
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static Archive* OpenAndLoad(
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const sys::Path& filePath, ///< The file path to open and load
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std::string* ErrorMessage ///< An optional error string
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);
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/// This method opens an existing archive file from \p Filename and reads in
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/// its symbol table without reading in any of the archive's members. This
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/// reduces both I/O and cpu time in opening the archive if it is to be used
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/// solely for symbol lookup (e.g. during linking). The \p Filename must
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/// exist and be an archive file or an exception will be thrown. This form
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/// of opening the archive is intended for read-only operations that need to
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/// locate members via the symbol table for link editing. Since the archve
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/// members are not read by this method, the archive will appear empty upon
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/// return. If editing operations are performed on the archive, they will
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/// completely replace the contents of the archive! It is recommended that
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/// if this form of opening the archive is used that only the symbol table
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/// lookup methods (getSymbolTable, findModuleDefiningSymbol, and
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/// findModulesDefiningSymbols) be used.
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/// @throws std::string if an error occurs opening the file
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/// @returns an Archive* that represents the archive file.
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/// @brief Open an existing archive and load its symbols.
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static Archive* OpenAndLoadSymbols(
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const sys::Path& Filename, ///< Name of the archive file to open
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std::string* ErrorMessage=0 ///< An optional error string
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);
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/// This destructor cleans up the Archive object, releases all memory, and
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/// closes files. It does nothing with the archive file on disk. If you
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/// haven't used the writeToDisk method by the time the destructor is
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/// called, all changes to the archive will be lost.
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/// @throws std::string if an error occurs
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/// @brief Destruct in-memory archive
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~Archive();
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/// @}
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/// @name Accessors
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/// @{
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public:
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/// @returns the path to the archive file.
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/// @brief Get the archive path.
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const sys::Path& getPath() { return archPath; }
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/// This method is provided so that editing methods can be invoked directly
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/// on the Archive's iplist of ArchiveMember. However, it is recommended
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/// that the usual STL style iterator interface be used instead.
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/// @returns the iplist of ArchiveMember
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/// @brief Get the iplist of the members
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MembersList& getMembers() { return members; }
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/// This method allows direct query of the Archive's symbol table. The
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/// symbol table is a std::map of std::string (the symbol) to unsigned (the
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/// file offset). Note that for efficiency reasons, the offset stored in
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/// the symbol table is not the actual offset. It is the offset from the
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/// beginning of the first "real" file member (after the symbol table). Use
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/// the getFirstFileOffset() to obtain that offset and add this value to the
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/// offset in the symbol table to obtain the real file offset. Note that
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/// there is purposefully no interface provided by Archive to look up
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/// members by their offset. Use the findModulesDefiningSymbols and
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/// findModuleDefiningSymbol methods instead.
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/// @returns the Archive's symbol table.
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/// @brief Get the archive's symbol table
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const SymTabType& getSymbolTable() { return symTab; }
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/// This method returns the offset in the archive file to the first "real"
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/// file member. Archive files, on disk, have a signature and might have a
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/// symbol table that precedes the first actual file member. This method
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/// allows you to determine what the size of those fields are.
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/// @returns the offset to the first "real" file member in the archive.
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/// @brief Get the offset to the first "real" file member in the archive.
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unsigned getFirstFileOffset() { return firstFileOffset; }
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/// This method will scan the archive for bytecode modules, interpret them
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/// and return a vector of the instantiated modules in \p Modules. If an
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/// error occurs, this method will return true. If \p ErrMessage is not null
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/// and an error occurs, \p *ErrMessage will be set to a string explaining
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/// the error that occurred.
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/// @returns true if an error occurred
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/// @brief Instantiate all the bytecode modules located in the archive
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bool getAllModules(std::vector<Module*>& Modules, std::string* ErrMessage);
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/// This accessor looks up the \p symbol in the archive's symbol table and
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/// returns the associated module that defines that symbol. This method can
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/// be called as many times as necessary. This is handy for linking the
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/// archive into another module based on unresolved symbols. Note that the
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/// ModuleProvider returned by this accessor should not be deleted by the
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/// caller. It is managed internally by the Archive class. It is possible
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/// that multiple calls to this accessor will return the same ModuleProvider
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/// instance because the associated module defines multiple symbols.
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/// @returns The ModuleProvider* found or null if the archive does not
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/// contain a module that defines the \p symbol.
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/// @brief Look up a module by symbol name.
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ModuleProvider* findModuleDefiningSymbol(
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const std::string& symbol, ///< Symbol to be sought
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std::string* ErrMessage ///< Error message storage, if non-zero
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);
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/// This method is similar to findModuleDefiningSymbol but allows lookup of
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/// more than one symbol at a time. If \p symbols contains a list of
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/// undefined symbols in some module, then calling this method is like
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/// making one complete pass through the archive to resolve symbols but is
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/// more efficient than looking at the individual members. Note that on
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/// exit, the symbols resolved by this method will be removed from \p
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/// symbols to ensure they are not re-searched on a subsequent call. If
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/// you need to retain the list of symbols, make a copy.
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/// @brief Look up multiple symbols in the archive.
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bool findModulesDefiningSymbols(
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std::set<std::string>& symbols, ///< Symbols to be sought
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std::set<ModuleProvider*>& modules, ///< The modules matching \p symbols
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std::string* ErrMessage ///< Error msg storage, if non-zero
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);
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/// This method determines whether the archive is a properly formed llvm
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/// bytecode archive. It first makes sure the symbol table has been loaded
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/// and has a non-zero size. If it does, then it is an archive. If not,
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/// then it tries to load all the bytecode modules of the archive. Finally,
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/// it returns whether it was successfull.
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/// @returns true if the archive is a proper llvm bytecode archive
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/// @brief Determine whether the archive is a proper llvm bytecode archive.
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bool isBytecodeArchive();
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/// @}
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/// @name Mutators
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/// @{
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public:
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/// This method is the only way to get the archive written to disk. It
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/// creates or overwrites the file specified when \p this was created
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/// or opened. The arguments provide options for writing the archive. If
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/// \p CreateSymbolTable is true, the archive is scanned for bytecode files
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/// and a symbol table of the externally visible function and global
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/// variable names is created. If \p TruncateNames is true, the names of the
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/// archive members will have their path component stripped and the file
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/// name will be truncated at 15 characters. If \p Compress is specified,
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/// all archive members will be compressed before being written. If
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/// \p PrintSymTab is true, the symbol table will be printed to std::cout.
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/// @returns false if an error occurred, \p error set to error message
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/// @returns true if the writing succeeded.
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/// @brief Write (possibly modified) archive contents to disk
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bool writeToDisk(
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bool CreateSymbolTable=false, ///< Create Symbol table
|
|
bool TruncateNames=false, ///< Truncate the filename to 15 chars
|
|
bool Compress=false, ///< Compress files
|
|
std::string* ErrMessage=0 ///< If non-null, where error msg is set
|
|
);
|
|
|
|
/// This method adds a new file to the archive. The \p filename is examined
|
|
/// to determine just enough information to create an ArchiveMember object
|
|
/// which is then inserted into the Archive object's ilist at the location
|
|
/// given by \p where.
|
|
/// @throws std::string if an error occurs reading the \p filename.
|
|
/// @returns nothing
|
|
/// @brief Add a file to the archive.
|
|
void addFileBefore(const sys::Path& filename, iterator where);
|
|
|
|
/// @}
|
|
/// @name Implementation
|
|
/// @{
|
|
protected:
|
|
/// @brief Construct an Archive for \p filename and optionally map it
|
|
/// into memory.
|
|
Archive(const sys::Path& filename, bool map = false );
|
|
|
|
/// @param error Set to address of a std::string to get error messages
|
|
/// @returns false on error
|
|
/// @brief Parse the symbol table at \p data.
|
|
bool parseSymbolTable(const void* data,unsigned len,std::string* error);
|
|
|
|
/// @returns A fully populated ArchiveMember or 0 if an error occurred.
|
|
/// @brief Parse the header of a member starting at \p At
|
|
ArchiveMember* parseMemberHeader(
|
|
const char*&At, ///< The pointer to the location we're parsing
|
|
const char*End, ///< The pointer to the end of the archive
|
|
std::string* error ///< Optional error message catcher
|
|
);
|
|
|
|
/// @param error Set to address of a std::string to get error messages
|
|
/// @returns false on error
|
|
/// @brief Check that the archive signature is correct
|
|
bool checkSignature(std::string* ErrMessage);
|
|
|
|
/// @param error Set to address of a std::string to get error messages
|
|
/// @returns false on error
|
|
/// @brief Load the entire archive.
|
|
bool loadArchive(std::string* ErrMessage);
|
|
|
|
/// @param error Set to address of a std::string to get error messages
|
|
/// @returns false on error
|
|
/// @brief Load just the symbol table.
|
|
bool loadSymbolTable(std::string* ErrMessage);
|
|
|
|
/// @brief Write the symbol table to an ofstream.
|
|
void writeSymbolTable(std::ofstream& ARFile);
|
|
|
|
/// Writes one ArchiveMember to an ofstream. If an error occurs, returns
|
|
/// false, otherwise true. If an error occurs and error is non-null then
|
|
/// it will be set to an error message.
|
|
/// @returns true Writing member succeeded
|
|
/// @returns false Writing member failed, \p error set to error message
|
|
bool writeMember(
|
|
const ArchiveMember& member, ///< The member to be written
|
|
std::ofstream& ARFile, ///< The file to write member onto
|
|
bool CreateSymbolTable, ///< Should symbol table be created?
|
|
bool TruncateNames, ///< Should names be truncated to 11 chars?
|
|
bool ShouldCompress, ///< Should the member be compressed?
|
|
std::string* ErrMessage ///< If non-null, place were error msg is set
|
|
);
|
|
|
|
/// @brief Fill in an ArchiveMemberHeader from ArchiveMember.
|
|
bool fillHeader(const ArchiveMember&mbr,
|
|
ArchiveMemberHeader& hdr,int sz, bool TruncateNames) const;
|
|
|
|
/// @brief Frees all the members and unmaps the archive file.
|
|
void cleanUpMemory();
|
|
|
|
/// This type is used to keep track of bytecode modules loaded from the
|
|
/// symbol table. It maps the file offset to a pair that consists of the
|
|
/// associated ArchiveMember and the ModuleProvider.
|
|
/// @brief Module mapping type
|
|
typedef std::map<unsigned,std::pair<ModuleProvider*,ArchiveMember*> >
|
|
ModuleMap;
|
|
|
|
/// @}
|
|
/// @name Data
|
|
/// @{
|
|
protected:
|
|
sys::Path archPath; ///< Path to the archive file we read/write
|
|
MembersList members; ///< The ilist of ArchiveMember
|
|
sys::MappedFile* mapfile; ///< Raw Archive contents mapped into memory
|
|
const char* base; ///< Base of the memory mapped file data
|
|
SymTabType symTab; ///< The symbol table
|
|
std::string strtab; ///< The string table for long file names
|
|
unsigned symTabSize; ///< Size in bytes of symbol table
|
|
unsigned firstFileOffset; ///< Offset to first normal file.
|
|
ModuleMap modules; ///< The modules loaded via symbol lookup.
|
|
ArchiveMember* foreignST; ///< This holds the foreign symbol table.
|
|
|
|
/// @}
|
|
/// @name Hidden
|
|
/// @{
|
|
private:
|
|
Archive(); ///< Do not implement
|
|
Archive(const Archive&); ///< Do not implement
|
|
Archive& operator=(const Archive&); ///< Do not implement
|
|
/// @}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|