Breakpoints in symbols with ABI tags (PR c++/19436)

Trying to set a breakpoint in a function with an ABI tag does not work
currently.  E.g., debugging gdb itself, we see this with the
"string_printf" function:

 (top-gdb) b string_print                               [TAB]
 (top-gdb) b string_printf[abi:cxx11](char const*, ...) [RET]
 No source file named string_printf[abi.
 Make breakpoint pending on future shared library load? (y or [n])

Quoting doesn't help:
 (top-gdb) b 'string_printf[abi:cxx11]'(char const*, ...)
 malformed linespec error: unexpected string, "(char const*, ...)"
 (top-gdb) b 'string_printf[abi:cxx11](char const*, ...)'
 No source file named string_printf[abi.
 Make breakpoint pending on future shared library load? (y or [n]) n

This patch fixes this, and takes it a bit further.

The actual symbol name as demangled by libiberty's demangler is really

 string_printf[abi:cxx11](char const*, ...)

however, this patch makes it possible to set the breakpoint with

 string_printf(char const*, ...)

too.  I.e., ignoring the ABI tag.

And to match, it teaches the completer to complete the symbol name
without the ABI tag, i.e.,

  "string_pri<TAB>"  -> "string_printf(char const*, ...)"

If however, you really want to break on a symbol with the tag, then
you simply start writing the tag, and GDB will preserve it, like:

  "string_printf[a<TAB>"  -> "string_printf[abi:cxx11](char const*, ...)"

Grows the gdb.linespec/ tests like this:

  -# of expected passes           8977
  +# of expected passes           9176

gdb/ChangeLog:
2017-11-29  Pedro Alves  <palves@redhat.com>

	PR c++/19436
	* NEWS: Mention setting breakpoints on functions with C++ ABI
	tags.
	* completer.h (completion_match_for_lcd) <match,
	mark_ignored_range>: New methods.
	<finish>: Consider ignored ranges.
	<clear>: Clear ignored ranges.
	<m_ignored_ranges, m_finished_storage>: New fields.
	* cp-support.c (cp_search_name_hash): Ignore ABI tags.
	(cp_symbol_name_matches_1, cp_fq_symbol_name_matches): Pass the
	completion_match_for_lcd pointer to strncmp_iw_with_mode.
	(test_cp_symbol_name_cmp): Add [abi:...] tags unit tests.
	* language.c (default_symbol_name_matcher): Pass the
	completion_match_for_lcd pointer to strncmp_iw_with_mode.
	* linespec.c (linespec_lexer_lex_string): Don't tokenize ABI tags.
	* utils.c (skip_abi_tag): New function.
	(strncmp_iw_with_mode): Add completion_match_for_lcd parameter.
	Handle ABI tags.
	* utils.h (strncmp_iw_with_mode): Add completion_match_for_lcd
	parameter.

gdb/testsuite/ChangeLog:
2017-11-29  Pedro Alves  <palves@redhat.com>

	PR c++/19436
	* gdb.linespec/cpls-abi-tag.cc: New file.
	* gdb.linespec/cpls-abi-tag.exp: New file.

gdb/doc/ChangeLog:
2017-11-29  Pedro Alves  <palves@redhat.com>

	PR c++/19436
	* gdb.texinfo (Debugging C Plus Plus): Document setting
	breakpoints in functions with ABI tags.

1 files changed, 10 insertions, 6 deletions

diff --git a/gdb/utils.h b/gdb/utils.h
index dff4b1703c..349ab93cce 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -49,15 +49,19 @@ enum class strncmp_iw_mode
 /* Helper for strcmp_iw and strncmp_iw.  Exported so that languages
    can implement both NORMAL and MATCH_PARAMS variants in a single
    function and defer part of the work to strncmp_iw_with_mode.
+
    LANGUAGE is used to implement some context-sensitive
    language-specific comparisons.  For example, for C++,
    "string1=operator()" should not match "string2=operator" even in
-   MATCH_PARAMS mode.  */
-extern int strncmp_iw_with_mode (const char *string1,
-				 const char *string2,
-				 size_t string2_len,
-				 strncmp_iw_mode mode,
-				 enum language language);
+   MATCH_PARAMS mode.
+
+   MATCH_FOR_LCD is passed down so that the function can mark parts of
+   the symbol name as ignored for completion matching purposes (e.g.,
+   to handle abi tags).  */
+extern int strncmp_iw_with_mode
+  (const char *string1, const char *string2, size_t string2_len,
+   strncmp_iw_mode mode, enum language language,
+   completion_match_for_lcd *match_for_lcd = NULL);
 
 /* Do a strncmp() type operation on STRING1 and STRING2, ignoring any
    differences in whitespace.  STRING2_LEN is STRING2's length.