X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gold%2Ffileread.h;h=74aeec94caa2e744d5c135cf7a823ad5e8024c63;hb=27b829ee701e29804216b3803fbaeb629be27491;hp=3afba862676c9594ed6ef70fdf9ab41921fa812e;hpb=0f7c0701ba26bd4c94e968f6be5c954819c97f81;p=binutils-gdb.git diff --git a/gold/fileread.h b/gold/fileread.h index 3afba862676..74aeec94caa 100644 --- a/gold/fileread.h +++ b/gold/fileread.h @@ -1,6 +1,6 @@ // fileread.h -- read files for gold -*- C++ -*- -// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. +// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -35,6 +35,29 @@ namespace gold { +// Since not all system supports stat.st_mtim and struct timespec, +// we define our own structure and fill the nanoseconds if we can. + +struct Timespec +{ + Timespec() + : seconds(0), nanoseconds(0) + { } + + Timespec(time_t a_seconds, int a_nanoseconds) + : seconds(a_seconds), nanoseconds(a_nanoseconds) + { } + + time_t seconds; + int nanoseconds; +}; + +// Get the last modified time of an unopened file. Returns false if the +// file does not exist. + +bool +get_mtime(const char* filename, Timespec* mtime); + class Position_dependent_options; class Input_file_argument; class Dirsearch; @@ -48,8 +71,8 @@ class File_read public: File_read() : name_(), descriptor_(-1), is_descriptor_opened_(false), object_count_(0), - size_(0), token_(false), views_(), saved_views_(), contents_(NULL), - mapped_bytes_(0), released_(true) + size_(0), token_(false), views_(), saved_views_(), mapped_bytes_(0), + released_(true), whole_file_view_(NULL) { } ~File_read(); @@ -118,12 +141,13 @@ class File_read // SIZE bytes. OFFSET is the offset into the input file for the // file we are reading; this is zero for a normal object file, // non-zero for an object file in an archive. ALIGNED is true if - // the data must be naturally aligned; this only matters when OFFSET - // is not zero. The pointer will remain valid until the File_read - // is unlocked. It is an error if we can not read enough data from - // the file. The CACHE parameter is a hint as to whether it will be - // useful to cache this data for later accesses--i.e., later calls - // to get_view, read, or get_lasting_view which retrieve the same + // the data must be naturally aligned (i.e., aligned to the size + // of a target word); this only matters when OFFSET is not zero. + // The pointer will remain valid until the File_read is unlocked. + // It is an error if we can not read enough data from the file. + // The CACHE parameter is a hint as to whether it will be useful + // to cache this data for later accesses--i.e., later calls to + // get_view, read, or get_lasting_view which retrieve the same // data. const unsigned char* get_view(off_t offset, off_t start, section_size_type size, bool aligned, @@ -153,7 +177,7 @@ class File_read // interface, and it would be nice to have something more automatic. void clear_uncached_views() - { this->clear_views(false); } + { this->clear_views(CLEAR_VIEWS_ARCHIVE); } // A struct used to do a multiple read. struct Read_multiple_entry @@ -190,32 +214,60 @@ class File_read this->reopen_descriptor(); return this->descriptor_; } + + // Return the file last modification time. Calls gold_fatal if the stat + // system call failed. + Timespec + get_mtime(); private: + // Control for what views to clear. + enum Clear_views_mode + { + // Clear uncached views not used by an archive. + CLEAR_VIEWS_NORMAL, + // Clear all uncached views (including in an archive). + CLEAR_VIEWS_ARCHIVE, + // Clear all views (i.e., we're destroying the file). + CLEAR_VIEWS_ALL + }; + // This class may not be copied. File_read(const File_read&); File_read& operator=(const File_read&); - // Total bytes mapped into memory during the link. This variable - // may not be accurate when running multi-threaded. + // Total bytes mapped into memory during the link if --stats. static unsigned long long total_mapped_bytes; - // Current number of bytes mapped into memory during the link. This - // variable may not be accurate when running multi-threaded. + // Current number of bytes mapped into memory during the link if + // --stats. static unsigned long long current_mapped_bytes; - // High water mark of bytes mapped into memory during the link. - // This variable may not be accurate when running multi-threaded. + // High water mark of bytes mapped into memory during the link if + // --stats. static unsigned long long maximum_mapped_bytes; // A view into the file. class View { public: + // Specifies how to dispose the data on destruction of the view. + enum Data_ownership + { + // Data owned by File object - nothing done in destructor. + DATA_NOT_OWNED, + // Data allocated with new[] and owned by this object - should + // use delete[]. + DATA_ALLOCATED_ARRAY, + // Data mmapped and owned by this object - should munmap. + DATA_MMAPPED + }; + View(off_t start, section_size_type size, const unsigned char* data, - unsigned int byteshift, bool cache, bool mapped) + unsigned int byteshift, bool cache, Data_ownership data_ownership) : start_(start), size_(size), data_(data), lock_count_(0), - byteshift_(byteshift), cache_(cache), mapped_(mapped), accessed_(true) + byteshift_(byteshift), cache_(cache), data_ownership_(data_ownership), + accessed_(true) { } ~View(); @@ -269,6 +321,12 @@ class File_read accessed() const { return this->accessed_; } + // Returns TRUE if this view contains permanent data -- e.g., data that + // was supplied by the owner of the File object. + bool + is_permanent_view() const + { return this->data_ownership_ == DATA_NOT_OWNED; } + private: View(const View&); View& operator=(const View&); @@ -289,7 +347,7 @@ class File_read bool cache_; // Whether the view is mapped into memory. If not, data_ points // to memory allocated using new[]. - bool mapped_; + Data_ownership data_ownership_; // Whether the view has been accessed recently. bool accessed_; }; @@ -332,7 +390,7 @@ class File_read // Clear the file views. void - clear_views(bool); + clear_views(Clear_views_mode); // The size of a file page for buffering data. static const off_t page_size = 8192; @@ -372,14 +430,18 @@ class File_read // List of views which were locked but had to be removed from views_ // because they were not large enough. Saved_views saved_views_; - // Specified file contents. Used only for testing purposes. - const unsigned char* contents_; // Total amount of space mapped into memory. This is only changed // while the file is locked. When we unlock the file, we transfer // the total to total_mapped_bytes, and reset this to zero. size_t mapped_bytes_; // Whether the file was released. bool released_; + // A view containing the whole file. May be NULL if we mmap only + // the relevant parts of the file. Not NULL if: + // - Flag --mmap_whole_files is set (default on 64-bit hosts). + // - The contents was specified in the constructor. Used only for + // testing purposes). + View* whole_file_view_; }; // A view of file data that persists even when the file is unlocked. @@ -420,21 +482,44 @@ class File_view class Input_file { public: + enum Format + { + FORMAT_NONE, + FORMAT_ELF, + FORMAT_BINARY + }; + Input_file(const Input_file_argument* input_argument) : input_argument_(input_argument), found_name_(), file_(), - is_in_sysroot_(false) + is_in_sysroot_(false), format_(FORMAT_NONE) { } + // Create an input file given just a filename. + Input_file(const char* name); + // Create an input file with the contents already provided. This is // only used for testing. With this path, don't call the open // method. Input_file(const Task*, const char* name, const unsigned char* contents, off_t size); + // Return the command line argument. + const Input_file_argument* + input_file_argument() const + { return this->input_argument_; } + + // Return whether this is a file that we will search for in the list + // of directories. + bool + will_search_for() const; + // Open the file. If the open fails, this will report an error and - // return false. + // return false. If there is a search, it starts at directory + // *PINDEX. *PINDEX should be initialized to zero. It may be + // restarted to find the next file with a matching name by + // incrementing the result and calling this again. bool - open(const General_options&, const Dirsearch&, const Task*); + open(const Dirsearch&, const Task*, int* pindex); // Return the name given by the user. For -lc this will return "c". const char* @@ -471,18 +556,40 @@ class Input_file is_in_sysroot() const { return this->is_in_sysroot_; } + // Whether this file is in a system directory. + bool + is_in_system_directory() const; + // Return whether this file is to be read only for its symbols. bool just_symbols() const; + // Return the format of the unconverted input file. + Format + format() const + { return this->format_; } + + // Try to find a file in the extra search dirs. Returns true on success. + static bool + try_extra_search_path(int* pindex, + const Input_file_argument* input_argument, + std::string filename, std::string* found_name, + std::string* namep); + + // Find the actual file. + static bool + find_file(const Dirsearch& dirpath, int* pindex, + const Input_file_argument* input_argument, + bool* is_in_sysroot, + std::string* found_name, std::string* namep); + private: Input_file(const Input_file&); Input_file& operator=(const Input_file&); // Open a binary file. bool - open_binary(const General_options&, const Task* task, - const std::string& name); + open_binary(const Task* task, const std::string& name); // The argument from the command line. const Input_file_argument* input_argument_; @@ -495,6 +602,8 @@ class Input_file File_read file_; // Whether we found the file in a directory in the system root. bool is_in_sysroot_; + // Format of unconverted input file. + Format format_; }; } // end namespace gold