struct symtabs_and_lines -> std::vector<symtab_and_line>

This replaces "struct symtabs_and_lines" with
std::vector<symtab_and_line> in most cases.  This removes a number of
cleanups.

In some cases, the sals objects do not own the sals they point at.
Instead they point at some sal that lives on the stack.  Typically
something like this:

  struct symtab_and_line sal;
  struct symtabs_and_lines sals;

  // fill in sal

  sals.nelts = 1;
  sals.sals = &sal;

  // use sals

Instead of switching those cases to std::vector too, such usages are
replaced by gdb::array_view<symtab_and_line> instead.  This avoids
introducing heap allocations.

gdb/ChangeLog:
2017-09-04  Pedro Alves  <palves@redhat.com>

	* ax-gdb.c (agent_command_1): Use range-for.
	* break-catch-throw.c (re_set_exception_catchpoint): Update.
	* breakpoint.c: Include "common/array-view.h".
	(init_breakpoint_sal, create_breakpoint_sal): Change sals
	parameter from struct symtabs_and_lines to
	array_view<symtab_and_line>.  Adjust.  Use range-for.  Update.
	(breakpoint_sals_to_pc): Change sals parameter from struct
	symtabs_and_lines to std::vector reference.
	(check_fast_tracepoint_sals): Change sals parameter from struct
	symtabs_and_lines to std::array_view.  Use range-for.
	(decode_static_tracepoint_spec): Return a std::vector instead of
	symtabs_and_lines.  Update.
	(create_breakpoint): Update.
	(break_range_command, until_break_command, clear_command): Update.
	(base_breakpoint_decode_location, bkpt_decode_location)
	(bkpt_probe_create_sals_from_location)
	(bkpt_probe_decode_location, tracepoint_decode_location)
	(tracepoint_probe_decode_location)
	(strace_marker_create_sals_from_location): Return a std::vector
	instead of symtabs_and_lines.
	(strace_marker_create_breakpoints_sal): Update.
	(strace_marker_decode_location): Return a std::vector instead of
	symtabs_and_lines.  Update.
	(update_breakpoint_locations): Change struct symtabs_and_lines
	parameters to gdb::array_view.  Adjust.
	(location_to_sals): Return a std::vector instead of
	symtabs_and_lines.  Update.
	(breakpoint_re_set_default): Use std::vector instead of struct
	symtabs_and_lines.
	(decode_location_default): Return a std::vector instead of
	symtabs_and_lines.  Update.
	* breakpoint.h: Include "common/array-view.h".
	(struct breakpoint_ops) <decode_location>: Now returns a
	std::vector instead of returning a symtabs_and_lines via output
	parameter.
	(update_breakpoint_locations): Change sals parameters to use
	gdb::array_view.
	* cli/cli-cmds.c (edit_command, list_command): Update to use
	std::vector and gdb::array_view.
	(ambiguous_line_spec): Adjust to use gdb::array_view and
	range-for.
	(compare_symtabs): Rename to ...
	(cmp_symtabs): ... this.  Change parameters to symtab_and_line
	const reference and adjust.
	(filter_sals): Rewrite using std::vector and standard algorithms.
	* elfread.c (elf_gnu_ifunc_resolver_return_stop): Simplify.
	(jump_command): Update to use std::vector.
	* linespec.c (struct linespec_state) <canonical_names>: Update
	comment.
	(add_sal_to_sals_basic): Delete.
	(add_sal_to_sals, filter_results, convert_results_to_lsals)
	(decode_line_2, create_sals_line_offset)
	(convert_address_location_to_sals, convert_linespec_to_sals)
	(convert_explicit_location_to_sals, parse_linespec)
	(event_location_to_sals, decode_line_full, decode_line_1)
	(decode_line_with_current_source)
	(decode_line_with_last_displayed, decode_objc)
	(decode_digits_list_mode, decode_digits_ordinary, minsym_found)
	(linespec_result::~linespec_result): Adjust to use std::vector
	instead of symtabs_and_lines.
	* linespec.h (linespec_sals::sals): Now a std::vector.
	(struct linespec_result): Use std::vector, bool, and in-class
	initialization.
	(decode_line_1, decode_line_with_current_source)
	(decode_line_with_last_displayed): Return std::vector.
	* macrocmd.c (info_macros_command): Use std::vector.
	* mi/mi-main.c (mi_cmd_trace_find): Use std::vector.
	* probe.c (parse_probes_in_pspace, parse_probes): Adjust to use
	std::vector.
	* probe.h (parse_probes): Return a std::vector.
	* python/python.c (gdbpy_decode_line): Use std::vector and
	gdb::array_view.
	* source.c (select_source_symtab, line_info): Use std::vector.
	* stack.c (func_command): Use std::vector.
	* symtab.h (struct symtabs_and_lines): Delete.
	* tracepoint.c (tfind_line_command, scope_info): Use std::vector.

1 files changed, 11 insertions, 21 deletions

diff --git a/gdb/linespec.h b/gdb/linespec.h
index 27d237a46a..ce74fe60be 100644
--- a/gdb/linespec.h
+++ b/gdb/linespec.h
@@ -46,53 +46,43 @@ struct linespec_sals
      destructor.  */
   char *canonical;
 
-  /* Sals.  The 'sals' field is destroyed by the linespec_result
-     destructor.  */
-  struct symtabs_and_lines sals;
+  /* Sals.  */
+  std::vector<symtab_and_line> sals;
 };
 
-typedef struct linespec_sals linespec_sals;
-DEF_VEC_O (linespec_sals);
-
 /* An instance of this may be filled in by decode_line_1.  The caller
    must make copies of any data that it needs to keep.  */
 
 struct linespec_result
 {
-  linespec_result ()
-    : special_display (0),
-      pre_expanded (0),
-      sals (NULL)
-  {
-  }
-
+  linespec_result () = default;
   ~linespec_result ();
 
   linespec_result (const linespec_result &) = delete;
   linespec_result &operator= (const linespec_result &) = delete;
 
-  /* If non-zero, the linespec should be displayed to the user.  This
+  /* If true, the linespec should be displayed to the user.  This
      is used by "unusual" linespecs where the ordinary `info break'
      display mechanism would do the wrong thing.  */
-  int special_display;
+  bool special_display = false;
 
-  /* If non-zero, the linespec result should be considered to be a
+  /* If true, the linespec result should be considered to be a
      "pre-expanded" multi-location linespec.  A pre-expanded linespec
      holds all matching locations in a single linespec_sals
      object.  */
-  int pre_expanded;
+  bool pre_expanded = false;
 
   /* If PRE_EXPANDED is non-zero, this is set to the location entered
      by the user.  */
   event_location_up location;
 
   /* The sals.  The vector will be freed by the destructor.  */
-  VEC (linespec_sals) *sals;
+  std::vector<linespec_sals> lsals;
 };
 
 /* Decode a linespec using the provided default symtab and line.  */
 
-extern struct symtabs_and_lines
+extern std::vector<symtab_and_line>
 	decode_line_1 (const struct event_location *location, int flags,
 		       struct program_space *search_pspace,
 		       struct symtab *default_symtab, int default_line);
@@ -147,12 +137,12 @@ extern void decode_line_full (const struct event_location *location, int flags,
    source symtab and line as defaults.
    This is for commands like "list" and "breakpoint".  */
 
-extern struct symtabs_and_lines decode_line_with_current_source (char *, int);
+extern std::vector<symtab_and_line> decode_line_with_current_source (char *, int);
 
 /* Given a string, return the line specified by it, using the last displayed
    codepoint's values as defaults, or nothing if they aren't valid.  */
 
-extern struct symtabs_and_lines decode_line_with_last_displayed (char *, int);
+extern std::vector<symtab_and_line> decode_line_with_last_displayed (char *, int);
 
 /* Does P represent one of the keywords?  If so, return
    the keyword.  If not, return NULL.  */