mirror of
https://github.com/intel/llvm.git
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c7bece56fa
Major fixed to allow reading files that are over 4GB. The main problems were that the DataExtractor was using 32 bit offsets as a data cursor, and since we mmap all of our object files we could run into cases where if we had a very large core file that was over 4GB, we were running into the 4GB boundary. So I defined a new "lldb::offset_t" which should be used for all file offsets. After making this change, I enabled warnings for data loss and for enexpected implicit conversions temporarily and found a ton of things that I fixed. Any functions that take an index internally, should use "size_t" for any indexes and also should return "size_t" for any sizes of collections. llvm-svn: 173463
633 lines
26 KiB
C++
633 lines
26 KiB
C++
//===-- ObjectFile.h --------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_ObjectFile_h_
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#define liblldb_ObjectFile_h_
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#include "lldb/lldb-private.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Host/FileSpec.h"
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#include "lldb/Core/ModuleChild.h"
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#include "lldb/Core/PluginInterface.h"
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#include "lldb/Host/Endian.h"
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#include "lldb/Symbol/Symtab.h"
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#include "lldb/Symbol/UnwindTable.h"
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namespace lldb_private {
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//----------------------------------------------------------------------
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/// @class ObjectFile ObjectFile.h "lldb/Symbol/ObjectFile.h"
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/// @brief A plug-in interface definition class for object file parsers.
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///
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/// Object files belong to Module objects and know how to extract
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/// information from executable, shared library, and object (.o) files
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/// used by operating system runtime. The symbol table and section list
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/// for an object file.
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///
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/// Object files can be represented by the entire file, or by part of a
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/// file. Examples of object files that are part of a file include
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/// object files that contain information for multiple architectures in
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/// the same file, or archive files that contain multiple objects
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/// (ranlib archives) (possibly for multiple architectures as well).
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///
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/// Object archive files (e.g. ranlib archives) can contain
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/// multiple .o (object) files that must be selected by index or by name.
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/// The number of objects that an ObjectFile contains can be determined
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/// using the ObjectFile::GetNumObjects() const
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/// function, and followed by a call to
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/// ObjectFile::SelectObjectAtIndex (uint32_t) to change the currently
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/// selected object. Objects can also be selected by name using the
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/// ObjectFile::SelectObject(const char *) function.
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///
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/// Once an architecture is selected (and an object is selected for
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/// for archives), the object file information can be extracted from
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/// this abstract class.
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//----------------------------------------------------------------------
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class ObjectFile:
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public STD_ENABLE_SHARED_FROM_THIS(ObjectFile),
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public PluginInterface,
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public ModuleChild
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{
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friend class lldb_private::Module;
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public:
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typedef enum
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{
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eTypeInvalid = 0,
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eTypeCoreFile, /// A core file that has a checkpoint of a program's execution state
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eTypeExecutable, /// A normal executable
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eTypeDebugInfo, /// An object file that contains only debug information
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eTypeDynamicLinker, /// The platform's dynamic linker executable
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eTypeObjectFile, /// An intermediate object file
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eTypeSharedLibrary, /// A shared library that can be used during execution
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eTypeStubLibrary, /// A library that can be linked against but not used for execution
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eTypeUnknown
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} Type;
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typedef enum
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{
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eStrataInvalid = 0,
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eStrataUnknown,
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eStrataUser,
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eStrataKernel,
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eStrataRawImage
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} Strata;
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//------------------------------------------------------------------
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/// Construct with a parent module, offset, and header data.
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///
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/// Object files belong to modules and a valid module must be
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/// supplied upon construction. The at an offset within a file for
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/// objects that contain more than one architecture or object.
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//------------------------------------------------------------------
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ObjectFile (const lldb::ModuleSP &module_sp,
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const FileSpec *file_spec_ptr,
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lldb::addr_t offset,
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lldb::addr_t length,
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lldb::DataBufferSP& headerDataSP);
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ObjectFile (const lldb::ModuleSP &module_sp,
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const lldb::ProcessSP &process_sp,
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lldb::addr_t header_addr,
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lldb::DataBufferSP& headerDataSP);
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//------------------------------------------------------------------
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/// Destructor.
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///
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/// The destructor is virtual since this class is designed to be
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/// inherited from by the plug-in instance.
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//------------------------------------------------------------------
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virtual
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~ObjectFile();
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//------------------------------------------------------------------
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/// Dump a description of this object to a Stream.
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///
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/// Dump a description of the current contents of this object
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/// to the supplied stream \a s. The dumping should include the
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/// section list if it has been parsed, and the symbol table
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/// if it has been parsed.
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///
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/// @param[in] s
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/// The stream to which to dump the object descripton.
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//------------------------------------------------------------------
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virtual void
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Dump (Stream *s) = 0;
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//------------------------------------------------------------------
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/// Find a ObjectFile plug-in that can parse \a file_spec.
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///
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/// Scans all loaded plug-in interfaces that implement versions of
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/// the ObjectFile plug-in interface and returns the first
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/// instance that can parse the file.
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///
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/// @param[in] module
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/// The parent module that owns this object file.
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///
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/// @param[in] file_spec
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/// A file specification that indicates which file to use as the
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/// object file.
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///
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/// @param[in] file_offset
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/// The offset into the file at which to start parsing the
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/// object. This is for files that contain multiple
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/// architectures or objects.
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///
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/// @param[in] file_size
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/// The size of the current object file if it can be determined
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/// or if it is known. This can be zero.
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///
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/// @see ObjectFile::ParseHeader()
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//------------------------------------------------------------------
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static lldb::ObjectFileSP
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FindPlugin (const lldb::ModuleSP &module_sp,
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const FileSpec* file_spec,
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lldb::addr_t file_offset,
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lldb::addr_t file_size,
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lldb::DataBufferSP &data_sp);
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//------------------------------------------------------------------
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/// Find a ObjectFile plug-in that can parse a file in memory.
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///
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/// Scans all loaded plug-in interfaces that implement versions of
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/// the ObjectFile plug-in interface and returns the first
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/// instance that can parse the file.
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///
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/// @param[in] module
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/// The parent module that owns this object file.
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///
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/// @param[in] process_sp
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/// A shared pointer to the process whose memory space contains
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/// an object file. This will be stored as a std::weak_ptr.
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///
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/// @param[in] header_addr
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/// The address of the header for the object file in memory.
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//------------------------------------------------------------------
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static lldb::ObjectFileSP
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FindPlugin (const lldb::ModuleSP &module_sp,
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const lldb::ProcessSP &process_sp,
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lldb::addr_t header_addr,
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lldb::DataBufferSP &file_data_sp);
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//------------------------------------------------------------------
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/// Split a path into a file path with object name.
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///
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/// For paths like "/tmp/foo.a(bar.o)" we often need to split a path
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/// up into the actual path name and into the object name so we can
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/// make a valid object file from it.
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///
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/// @param[in] path_with_object
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/// A path that might contain an archive path with a .o file
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/// specified in parens in the basename of the path.
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///
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/// @param[out] archive_file
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/// If \b true is returned, \a file_spec will be filled in with
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/// the path to the archive.
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///
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/// @param[out] archive_object
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/// If \b true is returned, \a object will be filled in with
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/// the name of the object inside the archive.
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///
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/// @return
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/// \b true if the path matches the pattern of archive + object
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/// and \a archive_file and \a archive_object are modified,
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/// \b false otherwise and \a archive_file and \a archive_object
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/// are guaranteed to be remain unchanged.
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//------------------------------------------------------------------
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static bool
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SplitArchivePathWithObject (const char *path_with_object,
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lldb_private::FileSpec &archive_file,
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lldb_private::ConstString &archive_object);
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//------------------------------------------------------------------
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/// Gets the address size in bytes for the current object file.
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///
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/// @return
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/// The size of an address in bytes for the currently selected
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/// architecture (and object for archives). Returns zero if no
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/// architecture or object has been selected.
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//------------------------------------------------------------------
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virtual uint32_t
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GetAddressByteSize () const = 0;
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//------------------------------------------------------------------
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/// Get the address type given a file address in an object file.
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///
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/// Many binary file formats know what kinds
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/// This is primarily for ARM binaries, though it can be applied to
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/// any executable file format that supports different opcode types
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/// within the same binary. ARM binaries support having both ARM and
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/// Thumb within the same executable container. We need to be able
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/// to get
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/// @return
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/// The size of an address in bytes for the currently selected
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/// architecture (and object for archives). Returns zero if no
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/// architecture or object has been selected.
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//------------------------------------------------------------------
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virtual lldb::AddressClass
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GetAddressClass (lldb::addr_t file_addr);
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//------------------------------------------------------------------
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/// Extract the dependent modules from an object file.
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///
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/// If an object file has information about which other images it
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/// depends on (such as shared libraries), this function will
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/// provide the list. Since many executables or shared libraries
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/// may depend on the same files,
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/// FileSpecList::AppendIfUnique(const FileSpec &) should be
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/// used to make sure any files that are added are not already in
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/// the list.
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///
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/// @param[out] file_list
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/// A list of file specification objects that gets dependent
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/// files appended to.
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///
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/// @return
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/// The number of new files that were appended to \a file_list.
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///
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/// @see FileSpecList::AppendIfUnique(const FileSpec &)
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//------------------------------------------------------------------
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virtual uint32_t
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GetDependentModules (FileSpecList& file_list) = 0;
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//------------------------------------------------------------------
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/// Tells whether this object file is capable of being the main executable
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/// for a process.
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///
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/// @return
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/// \b true if it is, \b false otherwise.
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//------------------------------------------------------------------
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virtual bool
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IsExecutable () const = 0;
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//------------------------------------------------------------------
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/// Returns the offset into a file at which this object resides.
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///
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/// Some files contain many object files, and this function allows
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/// access to an object's offset within the file.
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///
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/// @return
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/// The offset in bytes into the file. Defaults to zero for
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/// simple object files that a represented by an entire file.
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//------------------------------------------------------------------
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virtual lldb::addr_t
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GetOffset () const
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{ return m_offset; }
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virtual lldb::addr_t
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GetByteSize () const
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{ return m_length; }
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//------------------------------------------------------------------
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/// Get accessor to the object file specification.
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///
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/// @return
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/// The file specification object pointer if there is one, or
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/// NULL if this object is only from memory.
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//------------------------------------------------------------------
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virtual FileSpec&
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GetFileSpec() { return m_file; }
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//------------------------------------------------------------------
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/// Get const accessor to the object file specification.
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///
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/// @return
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/// The const file specification object pointer if there is one,
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/// or NULL if this object is only from memory.
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//------------------------------------------------------------------
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virtual const FileSpec&
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GetFileSpec() const { return m_file; }
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//------------------------------------------------------------------
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/// Get the name of the cpu, vendor and OS for this object file.
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///
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/// This value is a string that represents the target triple where
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/// the cpu type, the vendor and the OS are encoded into a string.
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///
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/// @param[out] target_triple
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/// The string value of the target triple.
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///
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/// @return
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/// \b True if the target triple was able to be computed, \b
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/// false otherwise.
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//------------------------------------------------------------------
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virtual bool
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GetArchitecture (ArchSpec &arch) = 0;
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//------------------------------------------------------------------
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/// Gets the section list for the currently selected architecture
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/// (and object for archives).
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///
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/// Section list parsing can be deferred by ObjectFile instances
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/// until this accessor is called the first time.
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///
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/// @return
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/// The list of sections contained in this object file.
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//------------------------------------------------------------------
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virtual SectionList *
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GetSectionList () = 0;
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//------------------------------------------------------------------
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/// Gets the symbol table for the currently selected architecture
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/// (and object for archives).
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///
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/// Symbol table parsing can be deferred by ObjectFile instances
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/// until this accessor is called the first time.
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///
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/// @return
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/// The symbol table for this object file.
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//------------------------------------------------------------------
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virtual Symtab *
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GetSymtab () = 0;
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//------------------------------------------------------------------
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/// Gets the UUID for this object file.
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///
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/// If the object file format contains a UUID, the value should be
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/// returned. Else ObjectFile instances should return the MD5
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/// checksum of all of the bytes for the object file (or memory for
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/// memory based object files).
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///
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/// @return
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/// Returns \b true if a UUID was successfully extracted into
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/// \a uuid, \b false otherwise.
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//------------------------------------------------------------------
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virtual bool
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GetUUID (lldb_private::UUID* uuid) = 0;
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//------------------------------------------------------------------
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/// Gets whether endian swapping should occur when extracting data
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/// from this object file.
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///
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/// @return
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/// Returns \b true if endian swapping is needed, \b false
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/// otherwise.
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//------------------------------------------------------------------
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virtual lldb::ByteOrder
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GetByteOrder () const = 0;
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//------------------------------------------------------------------
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/// Attempts to parse the object header.
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///
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/// This function is used as a test to see if a given plug-in
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/// instance can parse the header data already contained in
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/// ObjectFile::m_data. If an object file parser does not
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/// recognize that magic bytes in a header, false should be returned
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/// and the next plug-in can attempt to parse an object file.
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///
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/// @return
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/// Returns \b true if the header was parsed succesfully, \b
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/// false otherwise.
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//------------------------------------------------------------------
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virtual bool
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ParseHeader () = 0;
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//------------------------------------------------------------------
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/// Returns a reference to the UnwindTable for this ObjectFile
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///
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/// The UnwindTable contains FuncUnwinders objects for any function in
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/// this ObjectFile. If a FuncUnwinders object hasn't been created yet
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/// (i.e. the function has yet to be unwound in a stack walk), it
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/// will be created when requested. Specifically, we do not create
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/// FuncUnwinders objects for functions until they are needed.
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///
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/// @return
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/// Returns the unwind table for this object file.
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//------------------------------------------------------------------
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virtual lldb_private::UnwindTable&
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GetUnwindTable () { return m_unwind_table; }
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//------------------------------------------------------------------
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/// Similar to Process::GetImageInfoAddress().
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///
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/// Some platforms embed auxiliary structures useful to debuggers in the
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/// address space of the inferior process. This method returns the address
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/// of such a structure if the information can be resolved via entries in
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/// the object file. ELF, for example, provides a means to hook into the
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/// runtime linker so that a debugger may monitor the loading and unloading
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/// of shared libraries.
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///
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/// @return
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/// The address of any auxiliary tables, or an invalid address if this
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/// object file format does not support or contain such information.
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virtual lldb_private::Address
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GetImageInfoAddress () { return Address(); }
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//------------------------------------------------------------------
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/// Returns the address of the Entry Point in this object file - if
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/// the object file doesn't have an entry point (because it is not an
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/// executable file) then an invalid address is returned.
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///
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/// @return
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/// Returns the entry address for this module.
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//------------------------------------------------------------------
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virtual lldb_private::Address
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GetEntryPointAddress () { return Address();}
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//------------------------------------------------------------------
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/// Returns the address that represents the header of this object
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/// file.
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///
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/// The header address is defined as where the header for the object
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/// file is that describes the content of the file. If the header
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/// doesn't appear in a section that is defined in the object file,
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/// an address with no section is returned that has the file offset
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/// set in the m_offset member of the lldb_private::Address object.
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///
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/// @return
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/// Returns the entry address for this module.
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//------------------------------------------------------------------
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virtual lldb_private::Address
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GetHeaderAddress () { return Address();}
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virtual uint32_t
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GetNumThreadContexts ()
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{
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return 0;
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}
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virtual lldb::RegisterContextSP
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GetThreadContextAtIndex (uint32_t idx, lldb_private::Thread &thread)
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{
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return lldb::RegisterContextSP();
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}
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//------------------------------------------------------------------
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/// The object file should be able to calculate its type by looking
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/// at its file header and possibly the sections or other data in
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/// the object file. The file type is used in the debugger to help
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/// select the correct plug-ins for the job at hand, so this is
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/// important to get right. If any eTypeXXX definitions do not match
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/// up with the type of file you are loading, please feel free to
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/// add a new enumeration value.
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///
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/// @return
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/// The calculated file type for the current object file.
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//------------------------------------------------------------------
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virtual Type
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CalculateType() = 0;
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//------------------------------------------------------------------
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/// The object file should be able to calculate the strata of the
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/// object file.
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///
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/// Many object files for platforms might be for either user space
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/// debugging or for kernel debugging. If your object file subclass
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/// can figure this out, it will help with debugger plug-in selection
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/// when it comes time to debug.
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///
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/// @return
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/// The calculated object file strata for the current object
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/// file.
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//------------------------------------------------------------------
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virtual Strata
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CalculateStrata() = 0;
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//------------------------------------------------------------------
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/// Get the object file version numbers.
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///
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/// Many object files have a set of version numbers that describe
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/// the version of the executable or shared library. Typically there
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/// are major, minor and build, but there may be more. This function
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/// will extract the versions from object files if they are available.
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///
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/// If \a versions is NULL, or if \a num_versions is 0, the return
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/// value will indicate how many version numbers are available in
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/// this object file. Then a subsequent call can be made to this
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/// function with a value of \a versions and \a num_versions that
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/// has enough storage to store some or all version numbers.
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///
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/// @param[out] versions
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/// A pointer to an array of uint32_t types that is \a num_versions
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/// long. If this value is NULL, the return value will indicate
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/// how many version numbers are required for a subsequent call
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/// to this function so that all versions can be retrieved. If
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/// the value is non-NULL, then at most \a num_versions of the
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/// existing versions numbers will be filled into \a versions.
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/// If there is no version information available, \a versions
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/// will be filled with \a num_versions UINT32_MAX values
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/// and zero will be returned.
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///
|
|
/// @param[in] num_versions
|
|
/// The maximum number of entries to fill into \a versions. If
|
|
/// this value is zero, then the return value will indicate
|
|
/// how many version numbers there are in total so another call
|
|
/// to this function can be make with adequate storage in
|
|
/// \a versions to get all of the version numbers. If \a
|
|
/// num_versions is less than the actual number of version
|
|
/// numbers in this object file, only \a num_versions will be
|
|
/// filled into \a versions (if \a versions is non-NULL).
|
|
///
|
|
/// @return
|
|
/// This function always returns the number of version numbers
|
|
/// that this object file has regardless of the number of
|
|
/// version numbers that were copied into \a versions.
|
|
//------------------------------------------------------------------
|
|
virtual uint32_t
|
|
GetVersion (uint32_t *versions, uint32_t num_versions)
|
|
{
|
|
if (versions && num_versions)
|
|
{
|
|
for (uint32_t i=0; i<num_versions; ++i)
|
|
versions[i] = UINT32_MAX;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
//------------------------------------------------------------------
|
|
// Member Functions
|
|
//------------------------------------------------------------------
|
|
Type
|
|
GetType ()
|
|
{
|
|
if (m_type == eTypeInvalid)
|
|
m_type = CalculateType();
|
|
return m_type;
|
|
}
|
|
|
|
Strata
|
|
GetStrata ()
|
|
{
|
|
if (m_strata == eStrataInvalid)
|
|
m_strata = CalculateStrata();
|
|
return m_strata;
|
|
}
|
|
|
|
// When an object file is in memory, subclasses should try and lock
|
|
// the process weak pointer. If the process weak pointer produces a
|
|
// valid ProcessSP, then subclasses can call this function to read
|
|
// memory.
|
|
static lldb::DataBufferSP
|
|
ReadMemory (const lldb::ProcessSP &process_sp,
|
|
lldb::addr_t addr,
|
|
size_t byte_size);
|
|
|
|
size_t
|
|
GetData (off_t offset, size_t length, DataExtractor &data) const;
|
|
|
|
size_t
|
|
CopyData (off_t offset, size_t length, void *dst) const;
|
|
|
|
size_t
|
|
ReadSectionData (const Section *section,
|
|
off_t section_offset,
|
|
void *dst,
|
|
size_t dst_len) const;
|
|
size_t
|
|
ReadSectionData (const Section *section,
|
|
DataExtractor& section_data) const;
|
|
|
|
size_t
|
|
MemoryMapSectionData (const Section *section,
|
|
DataExtractor& section_data) const;
|
|
|
|
bool
|
|
IsInMemory () const
|
|
{
|
|
return m_memory_addr != LLDB_INVALID_ADDRESS;
|
|
}
|
|
|
|
protected:
|
|
//------------------------------------------------------------------
|
|
// Member variables.
|
|
//------------------------------------------------------------------
|
|
FileSpec m_file;
|
|
Type m_type;
|
|
Strata m_strata;
|
|
lldb::addr_t m_offset; ///< The offset in bytes into the file, or the address in memory
|
|
lldb::addr_t m_length; ///< The length of this object file if it is known (can be zero if length is unknown or can't be determined).
|
|
DataExtractor m_data; ///< The data for this object file so things can be parsed lazily.
|
|
lldb_private::UnwindTable m_unwind_table; /// < Table of FuncUnwinders objects created for this ObjectFile's functions
|
|
lldb::ProcessWP m_process_wp;
|
|
const lldb::addr_t m_memory_addr;
|
|
|
|
//------------------------------------------------------------------
|
|
/// Sets the architecture for a module. At present the architecture
|
|
/// can only be set if it is invalid. It is not allowed to switch from
|
|
/// one concrete architecture to another.
|
|
///
|
|
/// @param[in] new_arch
|
|
/// The architecture this module will be set to.
|
|
///
|
|
/// @return
|
|
/// Returns \b true if the architecture was changed, \b
|
|
/// false otherwise.
|
|
//------------------------------------------------------------------
|
|
bool SetModulesArchitecture (const ArchSpec &new_arch);
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN (ObjectFile);
|
|
};
|
|
|
|
} // namespace lldb_private
|
|
|
|
#endif // liblldb_ObjectFile_h_
|
|
|