gdb/source.h

   1 /* List lines of source files for GDB, the GNU debugger.
   2    Copyright (C) 1999-2019 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef SOURCE_H
  20 #define SOURCE_H
  21
  22 #include "common/scoped_fd.h"
  23
  24 struct symtab;
  25
  26 /* See openp function definition for their description.  */
  27
  28 enum openp_flag
  29 {
  30   OPF_TRY_CWD_FIRST = 0x01,
  31   OPF_SEARCH_IN_PATH = 0x02,
  32   OPF_RETURN_REALPATH = 0x04,
  33 };
  34
  35 DEF_ENUM_FLAGS_TYPE(openp_flag, openp_flags);
  36
  37 extern int openp (const char *, openp_flags, const char *, int,
  38                   gdb::unique_xmalloc_ptr<char> *);
  39
  40 extern int source_full_path_of (const char *, gdb::unique_xmalloc_ptr<char> *);
  41
  42 extern void mod_path (const char *, char **);
  43
  44 extern void add_path (const char *, char **, int);
  45
  46 extern void directory_switch (const char *, int);
  47
  48 extern char *source_path;
  49
  50 extern void init_source_path (void);
  51
  52 /* This function is capable of finding the absolute path to a
  53    source file, and opening it, provided you give it a FILENAME.  Both the
  54    DIRNAME and FULLNAME are only added suggestions on where to find the file.
  55
  56    FILENAME should be the filename to open.
  57    DIRNAME is the compilation directory of a particular source file.
  58            Only some debug formats provide this info.
  59    FULLNAME can be the last known absolute path to the file in question.
  60      Space for the path must have been malloc'd.  If a path substitution
  61      is applied we free the old value and set a new one.
  62
  63    On Success
  64      A valid file descriptor is returned (the return value is positive).
  65      FULLNAME is set to the absolute path to the file just opened.
  66      The caller is responsible for freeing FULLNAME.
  67
  68    On Failure
  69      An invalid file descriptor is returned (the return value is negative).
  70      FULLNAME is set to NULL.  */
  71 extern scoped_fd find_and_open_source (const char *filename,
  72                                        const char *dirname,
  73                                        gdb::unique_xmalloc_ptr<char> *fullname);
  74
  75 /* Open a source file given a symtab S.  Returns a file descriptor or
  76    negative number for error.  */
  77 extern scoped_fd open_source_file (struct symtab *s);
  78
  79 /* Open a source file given a symtab S (by calling open_source_file), then
  80    ensure the line_charpos data is initialised for symtab S before
  81    returning.  */
  82 extern scoped_fd open_source_file_with_line_charpos (struct symtab *s);
  83
  84 extern gdb::unique_xmalloc_ptr<char> rewrite_source_path (const char *path);
  85
  86 extern const char *symtab_to_fullname (struct symtab *s);
  87
  88 /* Returns filename without the compile directory part, basename or absolute
  89    filename.  It depends on 'set filename-display' value.  */
  90 extern const char *symtab_to_filename_for_display (struct symtab *symtab);
  91
  92 /* Return the first line listed by print_source_lines.  Used by
  93    command interpreters to request listing from a previous point.  If
  94    0, then no source lines have yet been listed since the last time
  95    the current source line was changed.  */
  96 extern int get_first_line_listed (void);
  97
  98 /* Return the default number of lines to print with commands like the
  99    cli "list".  The caller of print_source_lines must use this to
 100    calculate the end line and use it in the call to print_source_lines
 101    as it does not automatically use this value.  */
 102 extern int get_lines_to_list (void);
 103
 104 /* Return the current source file for listing and next line to list.
 105    NOTE: The returned sal pc and end fields are not valid.  */
 106 extern struct symtab_and_line get_current_source_symtab_and_line (void);
 107
 108 /* If the current source file for listing is not set, try and get a default.
 109    Usually called before get_current_source_symtab_and_line() is called.
 110    It may err out if a default cannot be determined.
 111    We must be cautious about where it is called, as it can recurse as the
 112    process of determining a new default may call the caller!
 113    Use get_current_source_symtab_and_line only to get whatever
 114    we have without erroring out or trying to get a default.  */
 115 extern void set_default_source_symtab_and_line (void);
 116
 117 /* Return the current default file for listing and next line to list
 118    (the returned sal pc and end fields are not valid.)
 119    and set the current default to whatever is in SAL.
 120    NOTE: The returned sal pc and end fields are not valid.  */
 121 extern symtab_and_line set_current_source_symtab_and_line
 122   (const symtab_and_line &sal);
 123
 124 /* Reset any information stored about a default file and line to print.  */
 125 extern void clear_current_source_symtab_and_line (void);
 126
 127 /* Add a source path substitution rule.  */
 128 extern void add_substitute_path_rule (char *, char *);
 129
 130 /* Flags passed as 4th argument to print_source_lines.  */
 131 enum print_source_lines_flag
 132   {
 133     /* Do not print an error message.  */
 134     PRINT_SOURCE_LINES_NOERROR = (1 << 0),
 135
 136     /* Print the filename in front of the source lines.  */
 137     PRINT_SOURCE_LINES_FILENAME = (1 << 1)
 138   };
 139 DEF_ENUM_FLAGS_TYPE (enum print_source_lines_flag, print_source_lines_flags);
 140
 141 /* Show source lines from the file of symtab S, starting with line
 142    number LINE and stopping before line number STOPLINE.  If this is
 143    not the command line version, then the source is shown in the source
 144    window otherwise it is simply printed.  */
 145 extern void print_source_lines (struct symtab *s, int line, int stopline,
 146                                 print_source_lines_flags flags);
 147
 148 /* Wrap up the logic to build a line number range for passing to
 149    print_source_lines when using get_lines_to_list.  An instance of this
 150    class can be built from a single line number and a direction (forward or
 151    backward) the range is then computed using get_lines_to_list.  */
 152 class source_lines_range
 153 {
 154 public:
 155   /* When constructing the range from a single line number, does the line
 156      range extend forward, or backward.  */
 157   enum direction
 158   {
 159    FORWARD,
 160    BACKWARD
 161   };
 162
 163   /* Construct a SOURCE_LINES_RANGE starting at STARTLINE and extending in
 164    direction DIR.  The number of lines is from GET_LINES_TO_LIST.  If the
 165    direction is backward then the start is actually (STARTLINE -
 166    GET_LINES_TO_LIST).  There is also logic in place to ensure the start
 167    is always 1 or more, and the end will be at most INT_MAX.  */
 168   explicit source_lines_range (int startline, direction dir = FORWARD);
 169
 170   /* Construct a SOURCE_LINES_RANGE from STARTLINE to STOPLINE.  */
 171   explicit source_lines_range (int startline, int stopline)
 172     : m_startline (startline),
 173       m_stopline (stopline)
 174   { /* Nothing.  */ }
 175
 176   /* Return the line to start listing from.  */
 177   int startline () const
 178   { return m_startline; }
 179
 180   /* Return the line after the last line that should be listed.  */
 181   int stopline () const
 182   { return m_stopline; }
 183
 184 private:
 185
 186   /* The start and end of the range.  */
 187   int m_startline;
 188   int m_stopline;
 189 };
 190
 191 /* Variation of previous print_source_lines that takes a range instead of a
 192    start and end line number.  */
 193 extern void print_source_lines (struct symtab *s, source_lines_range r,
 194                                 print_source_lines_flags flags);
 195
 196 /* Forget line positions and file names for the symtabs in a
 197    particular objfile.  */
 198 extern void forget_cached_source_info_for_objfile (struct objfile *);
 199
 200 /* Forget what we learned about line positions in source files, and
 201    which directories contain them; must check again now since files
 202    may be found in a different directory now.  */
 203 extern void forget_cached_source_info (void);
 204
 205 /* Set the source file default for the "list" command to be S.
 206
 207    If S is NULL, and we don't have a default, find one.  This
 208    should only be called when the user actually tries to use the
 209    default, since we produce an error if we can't find a reasonable
 210    default.  Also, since this can cause symbols to be read, doing it
 211    before we need to would make things slower than necessary.  */
 212 extern void select_source_symtab (struct symtab *s);
 213
 214 #endif