Previously fix-it hints couldn't contain newlines.  This is
due to the need to print something user-readable for them
within diagnostic-show-locus, and for handling them within
edit-context for printing diffs and regenerating content.

This patch enables limited support for fix-it hints with newlines,
for suggesting adding new lines.
Such a fix-it hint must have exactly one newline character, at the
end of the content.  It must be an insertion at the beginning of
a line (so that e.g. fix-its that split a pre-existing line are
still rejected).

They are printed by diagnostic-show-locus with a '+' in the
left-hand margin, like this:

test.c:42:4: note: suggest adding 'break;' here
+      break;
     case 'b':
     ^~~~~~~~~

and the printer injects "spans" if the insertion location is not
near the primary range of the diagnostic e.g.:

test.c:4:2: note: unrecognized 'putchar'; suggest including '<stdio.h>'
test.c:1:1:
+#include <stdio.h>

test.c:4:2:
  putchar (ch);
  ^~~~~~~

gcc/ChangeLog:
	* diagnostic-show-locus.c
	(layout::should_print_annotation_line_p): Make private.
	(layout::print_annotation_line): Make private.
	(layout::annotation_line_showed_range_p): Make private.
	(layout::show_ruler): Make private.
	(layout::print_source_line): Make private.  Pass in line and
	line_width, rather than calling location_get_source_line.  Drop
	returned value.
	(layout::print_leading_fixits): New method.
	(layout::print_any_fixits): Rename to...
	(layout::print_trailing_fixits): ...this, and make private.
	Don't print newline fixits.
	(diagnostic_show_locus): Move logic for printing one row into...
	(layout::print_line): ...this new function.  Move the
	location_get_source_line call and error-handling from
	print_source_line to here.  Call print_leading_fixits, and rename
	print_any_fixits to print_trailing_fixits.
	(selftest::test_fixit_insert_containing_newline): Update now that
	newlines are partially supported.
	(selftest::test_fixit_insert_containing_newline_2): New test.
	(selftest::test_fixit_replace_containing_newline): Update comments.
	(selftest::diagnostic_show_locus_c_tests): Call the new test.
	* edit-context.c (class added_line): New class.
	(class edited_line): Describe newline handling in comment.
	(edited_line::actually_edited_p): New method.
	(edited_line::print_content): Delete redundant decl.
	(edited_line::m_predecessors): New field.
	(edited_file::print_content): Call edited_line::print_content.
	(edited_file::print_diff): Update to support newlines.
	(edited_file::print_diff_hunk): Likewise.
	(edited_file::print_run_of_changed_lines): New function.
	(edited_file::print_diff_line): Convert to...
	(print_diff_line): ...this.
	(edited_file::get_effective_line_count): New function.
	(edited_line::edited_line): Initialize new field m_predecessors.
	(edited_line::~edited_line): Clean up m_predecessors.
	(edited_line::apply_fixit): Handle newlines.
	(edited_line::get_effective_line_count): New function.
	(edited_line::print_content): New function.
	(edited_line::print_diff_lines): New function.
	(selftest::test_applying_fixits_insert_containing_newline): New
	test.
	(selftest::test_applying_fixits_replace_containing_newline): New
	test.
	(selftest::insert_line): New function.
	(selftest::test_applying_fixits_multiple_lines): Add example of
	inserting a line.
	(selftest::edit_context_c_tests): Call the new tests.

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/diagnostic-test-show-locus-bw.c
	(test_fixit_insert_newline): New function.
	* gcc.dg/plugin/diagnostic-test-show-locus-color.c
	(test_fixit_insert_newline): New function.
	* gcc.dg/plugin/diagnostic-test-show-locus-generate-patch.c
	(test_fixit_insert_newline): New function.
	* gcc.dg/plugin/diagnostic-test-show-locus-parseable-fixits.c
	(test_fixit_insert_newline): New function.
	* gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
	(test_show_locus): Handle test_fixit_insert_newline.

libcpp/ChangeLog:
	* include/line-map.h (class rich_location): Update description of
	newline handling.
	(class fixit_hint): Likewise.
	(fixit_hint::ends_with_newline_p): New decl.
	* line-map.c (rich_location::maybe_add_fixit): Support newlines
	in fix-it hints that are insertions of single lines at the start
	of a line.  Don't consolidate into such fix-it hints.
	(fixit_hint::ends_with_newline_p): New method.

From-SVN: r247522

gcc/po:
	* gcc.pot: Regenerate.

libcpp/po:
	* cpplib.pot: Regenerate.

From-SVN: r247447

The original implementation of fix-it hints (r230674) had an abstract
base class "fixit_hint" and three subclasses, representing
each of insertions, replacements, and deletions.

Having multiple classes for fix-it hints was a nuisance, as it required
per-class logic everywhere that the hints were handled.

In r239632 I eliminated the deletion subclass in favor of replacement
with the empty string (two subclasses are easier than three).

This patch eliminates the class hierarchy altogether by implementing
insertion in terms of replacement, by representing replacements via
a half-open interval (so that for an insertion, start == next location,
and we're effectively replacing an empty range at the insertion point
with the new string).

This greatly simplifies the code for handling fix-it hints; for example
it allows removal of a parallel class hierarchy of line_event within
edit-context.c.

It also improves consolidation of hints: we can now consolidate
insertions at the same location, affecting a couple of tests
(selftest::test_one_liner_many_fixits and
gcc.dg/Wmissing-braces-fixits.c).

gcc/ChangeLog:
	* diagnostic-show-locus.c (layout::get_expanded_location): Rewrite
	to use new fixit_hint representation, using the "replace" logic.
	(get_line_span_for_fixit_hint): Likewise.
	(layout::print_any_fixits): Likewise.
	(selftest::test_one_liner_many_fixits): Rename to...
	(selftest::test_one_liner_many_fixits_1): ...this, and update
	comment and expected output to reflect that the multiple fix-it
	hints are now consolidated into one insertion.
	(selftest::test_one_liner_many_fixits_2): New test.
	(selftest::test_diagnostic_show_locus_one_liner): Update for
	above.
	(selftest::test_fixit_consolidation): Update for fix-it API
	change.
	* diagnostic.c (print_parseable_fixits): Likewise.
	* edit-context.c (edited_line::m_line_events): Convert from
	auto_vec <line_event *> to auto_vec <line_event>.
	(class line_event): Convert from abstract base class to a concrete
	class, taking over the role of replace_event.
	(class insert_event): Delete.
	(class replace_event): Rename to class line_event.  Convert to
	half-open range.
	(edit_context::add_fixits): Reimplement.
	(edit_context::apply_insert): Delete.
	(edit_context::apply_replace): Rename to...
	(edit_context::apply_fixit): ...this.  Convert to half-open range.
	(edited_file::apply_insert): Delete.
	(edited_file::apply_replace): Rename to...
	(edited_file::apply_fixit): ...this.
	(edited_line::~edited_line): Drop deletion of events.
	(edited_line::apply_insert): Delete.
	(edited_line::apply_replace): Rename to...
	(edited_line::apply_fixit): ...this.  Convert to half-open range.
	Update for change to type of m_line_events.
	* edit-context.h (edit_context::apply_insert): Delete.
	(edit_context::apply_replace): Rename to...
	(edit_context::apply_fixit): ...this.

gcc/testsuite/ChangeLog:
	* gcc.dg/Wmissing-braces-fixits.c: Update expected output to
	reflect insertion fix-it hints at the same location now being
	consolidated.

libcpp/ChangeLog:
	* include/line-map.h (source_range::intersects_line_p): Delete.
	(rich_location::add_fixit): Delete.
	(rich_location::maybe_add_fixit): New method.
	(class fixit_hint): Reimplement in terms of...
	(class fixit_replace): ...this.
	(class fixit_insert): Delete.
	* line-map.c (linemap_position_for_loc_and_offset): Drop overzealous
	linemap_assert_fails.
	(source_range::intersects_line_p): Rename to...
	(fixit_hint::affects_line_p): New function.
	(rich_location::add_fixit_insert_before): Reimplement in terms of
	maybe_add_fixit, moving validation there.
	(rich_location::add_fixit_insert_after): Likewise.
	(column_before_p): Delete.
	(rich_location::add_fixit_replace): Reimplement in terms of
	maybe_add_fixit, moving validation there.  Convert closed input range
	to half-open range.
	(rich_location::add_fixit): Delete.
	(rich_location::maybe_add_fixit): New function.
	(fixit_insert::fixit_insert): Delete.
	(fixit_insert::~fixit_insert): Delete.
	(fixit_insert::affects_line_p): Delete.
	(fixit_insert::maybe_append_replace): Delete.
	(fixit_replace::fixit_replace): Rename to...
	(fixit_hint::fixit_hint): ...this, rewriting as necessary.
	(fixit_replace::~fixit_replace): Delete.
	(fixit_replace::affects_line_p): Delete.
	(fixit_replace::maybe_append_replace): Rename to...
	(fixit_hint::maybe_append): ...this, rewriting as necessary.

From-SVN: r247445

From-SVN: r247420

gcc/po:
	* gcc.pot: Regenerate.

libcpp/po:
	* cpplib.pot: Regenerate.

From-SVN: r247113

gcc:

	* alias.c (base_alias_check): Fix typo in comment.
	* cgraph.h (class ipa_polymorphic_call_context): Likewise.
	* cgraphunit.c (symbol_table::compile): Likewise.
	* collect2.c (maybe_run_lto_and_relink): Likewise.
	* config/arm/arm.c (arm_thumb1_mi_thunk): Likewise.
	* config/avr/avr-arch.h (avr_arch_info_t): Likewise.
	* config/avr/avr.c (avr_map_op_t): Likewise.
	* config/cr16/cr16.h (DATA_ALIGNMENT): Likewise.
	* config/epiphany/epiphany.c (TARGET_ARG_PARTIAL_BYTES): Likewise.
	* config/epiphany/epiphany.md (movcc): Likewise.
	* config/i386/i386.c (legitimize_pe_coff_extern_decl): Likewise.
	* config/m68k/m68k.c (struct _sched_ib, m68k_sched_variable_issue):
	Likewise.
	* config/mips/mips.c (mips_save_restore_reg): Likewise.
	* config/rx/rx.c (rx_is_restricted_memory_address): Likewise.
	* config/s390/s390.c (Z10_EARLYLOAD_DISTANCE): Likewise.
	* config/sh/sh.c (sh_rtx_costs): Likewise.
	* fold-const.c (fold_truth_andor): Likewise.
	* genautomata.c (collapse_flag): Likewise.
	* gengtype.h (struct type::u::s): Likewise.
	* gensupport.c (has_subst_attribute, add_mnemonic_string): Likewise.
	* input.c (FORMAT_AMOUNT): Likewise.
	* ipa-cp.c (class ipcp_lattice, agg_replacements_to_vector)
	(known_aggs_to_agg_replacement_list): Likewise.
	* ipa-inline-analysis.c: Likewise.
	* ipa-inline.h (estimate_edge_time, estimate_edge_hints): Likewise.
	* ipa-polymorphic-call.c
	(ipa_polymorphic_call_context::restrict_to_inner_class): Likewise.
	* loop-unroll.c (analyze_insn_to_expand_var): Likewise.
	* lra.c (lra_optional_reload_pseudos, lra_subreg_reload_pseudos):
	Likewise.
	* modulo-sched.c (apply_reg_moves): Likewise.
	* omp-expand.c (build_omp_regions_1): Likewise.
	* trans-mem.c (struct tm_wrapper_hasher): Likewise.
	* tree-ssa-loop-ivopts.c (may_eliminate_iv): Likewise.
	* tree-ssa-loop-niter.c (maybe_lower_iteration_bound): Likewise.
	* tree-vect-data-refs.c (vect_enhance_data_refs_alignment): Likewise.
	* value-prof.c: Likewise.
	* var-tracking.c (val_reset): Likewise.

gcc/ada:

	* doc/gnat_ugn/gnat_and_program_execution.rst: Fix typo.
	* g-socket.adb (To_Host_Entry): Fix typo in comment.
	* gnat_ugn.texi: Fix typo.
	* raise.c (_gnat_builtin_longjmp): Fix capitalization in comment.
	* s-stposu.adb (Allocate_Any_Controlled): Fix typo in comment.
	* sem_ch3.adb (Build_Derived_Record_Type): Likewise.
	* sem_util.adb (Mark_Coextensions): Likewise.
	* sem_util.ads (Available_Full_View_Of_Component): Likewise.

gcc/c:

	* c-array-notation.c: Fix typo in comment.

gcc/c-family:

	* c-warn.c (do_warn_double_promotion): Fix typo in comment.

gcc/cp:

        * class.c (update_vtable_entry_for_fn): Fix typo in comment.
	* decl2.c (one_static_initialization_or_destruction): Likewise.
	* name-lookup.c (store_bindings): Likewise.
	* parser.c (make_call_declarator): Likewise.
	* pt.c (check_explicit_specialization): Likewise.

gcc/testsuite:

	* g++.old-deja/g++.benjamin/scope02.C: Fix typo in comment.
	* gcc.dg/20031012-1.c: Likewise.
	* gcc.dg/ipa/ipcp-1.c: Likewise.
	* gcc.dg/torture/matrix-3.c: Likewise.
	* gcc.target/powerpc/ppc-spe.c: Likewise.
	* gcc.target/rx/zero-width-bitfield.c: Likewise.

libcpp:

	* include/line-map.h (LINEMAPS_MACRO_MAPS): Fix typo in comment.
	* lex.c (search_line_fast): Likewise.
	* pch.h (cpp_valid_state): Likewise.

libdecnumber:

	* decCommon.c (decFloatFromPackedChecked): Fix typo in comment.
	* decNumber.c (decNumberPower, decMultiplyOp): Likewise.

libgcc:

	* config/c6x/pr-support.c (__gnu_unwind_execute): Fix typo in comment.

libitm:

	* libitm_i.h (sutrct gtm_thread): Fix typo in comment.

From-SVN: r246664

	* lex.c (search_line_fast) [__ARM_NEON && __ARM_64BIT_STATE]:
	Convert 64-bit value to boolean before passing to
	__builtin_expect.

From-SVN: r246312

From-SVN: r246211

From-SVN: r245298

From-SVN: r245046

From-SVN: r244996

From-SVN: r244836

PR c++/77949 identifies an ICE when the C++ frontend attempts to emit a
fix-it hint inserting a missing semicolon at column 4097 of a source file.

This column value exceeds LINE_MAP_MAX_COLUMN_NUMBER and hence isn't
representable using a location_t.

Attempting to do so leads to these problems, which this patch fixes:

(a) when encountering a column number > LINE_MAP_MAX_COLUMN_NUMBER we
create a new linemap with m_column_and_range_bits == 0, but
linemap_position_for_column doesn't check for this, and hence can emit
a bogus location_t value that's calculated relative to the previous
linemap start, but which will be decoded relative to the new linemap,
leading to very large incorrect line values.

(b) when encountering a column number that can't be represented, and
for which the linemap was pre-existing, the code would hit this assertion:
  if (linemap_assert_fails (column < (1u << map->m_column_and_range_bits)))
around a bail-out condition.  The patch replaces this assertion with a
simple conditional, to stop the ICE when this occurs, and fixes the
bit count (effective column bits, vs column+range bits)

(c) the C++ frontend wasn't checking for failure of
linemap_position_for_loc_and_offset when considering emitting the fix-it
hint.  The patch adds a conditional, so that no fix-it hint is emitted
if the location is bogus.

gcc/cp/ChangeLog:
	PR c++/77949
	* parser.c (cp_parser_class_specifier_1): Only suggest inserting
	a missing semicolon if we have a valid insertion location for
	the fix-it hint.

gcc/ChangeLog:
	PR c++/77949
	* input.c (selftest::test_accessing_ordinary_linemaps): Verify
	that we correctly handle column numbers greater than
	LINE_MAP_MAX_COLUMN_NUMBER.

gcc/testsuite/ChangeLog:
	PR c++/77949
	* g++.dg/diagnostic/pr77949.C: New test case.

libcpp/ChangeLog:
	PR c++/77949
	* line-map.c (linemap_position_for_column): When calling
	linemap_start_line, detect if a new linemap was created with
	0 column bits, and bail out early if this is the case.
	(linemap_position_for_loc_and_offset): Replace overzealous
	linemap_assert_fails with a simple conditional; use correct
	bit count.

From-SVN: r244292

From-SVN: r244288

From-SVN: r244230

PR c++/72803 describes an issue where a fix-it hint is to be emitted at
column 512 of a 511-column source line, leading to an ICE.

The root cause is a bug in linemap_line_start, when transitioning from
lines >= 512 in width to narrow lines.

The wide line in the reproducer has a line map with:
  m_column_and_range_bits = 15, m_range_bits = 5
giving 10 effective bits for representing columns, so that columns <= 1023
can be represented.

When parsing the following line,
  linemap_line_start (..., ..., max_column_hint=0);
is called.  This leads to the "add_map" logic, due to this condition:
      || (max_column_hint <= 80 && effective_column_bits >= 10)
i.e. the new line is sufficiently narrower than the old one to
potentially use a new linemap (so as to conserve values within the
location_t space).

It then attempts to avoid allocating a new line map.  Part of the logic
to determine if we really need a new line map is this condition:
   SOURCE_COLUMN (map, highest) >= (1U << column_bits)
The above condition is incorrect: we need to determine if the highest
column we've handed out will fit within the proposed *effective* column
bits, but "column_bits" here is the column plus the range bits, rather
than just the column bits.

Hence in this case linemap_line_start erroneously decides that we don't
need a new line map, and updates the column bits within the existing
line map, so any location_t values we've already handed out within it
that are offset from the start by
  >= (1<<new_column_and_range_bits)
effectively change meaning, leading to incorrect line&column information
when decoding them, and various "interesting" ways for the linemap
code to fail.

The fix is to use the effective column bits in the above conditional.

gcc/ChangeLog:
	PR c++/72803
	* input.c (selftest::test_accessing_ordinary_linemaps): Verify
	that the transition from a max line width >= 1<<10 to narrower
	lines works correctly.

gcc/testsuite/ChangeLog:
	PR c++/72803
	* g++.dg/diagnostic/pr72803.C: New test case.

libcpp/ChangeLog:
	PR c++/72803
	* line-map.c (linemap_line_start): When determining if the highest
	column given out so far will fit into a proposed change to the
	current map, use the effective number of column bits, rather than
	the total number of column + range bits.

From-SVN: r244199

From-SVN: r244080

From-SVN: r244042

gcc/po:
	* be.po, da.po, de.po, el.po, es.po, fi.po, fr.po, hr.po, id.po,
	ja.po, nl.po, ru.po, sr.po, sv.po, tr.po, uk.po, vi.po, zh_CN.po,
	zh_TW.po: Update.

libcpp/po:
	* be.po, ca.po, da.po, de.po, el.po, eo.po, es.po, fi.po, fr.po,
	id.po, ja.po, nl.po, pr_BR.po, ru.po, sr.po, sv.po, tr.po, uk.po,
	vi.po, zh_CN.po, zh_TW.po: Update.

From-SVN: r244032

From-SVN: r243994

gcc/po:
	* gcc.pot: Regenerate.

libcpp/po:
	* cpplib.pot: Regenerate.

From-SVN: r243991

gcc/ChangeLog:
	PR preprocessor/78680
	PR preprocessor/78811
	* input.c (struct selftest::lexer_test): Add field
	m_implicitly_expect_EOF.
	(selftest::lexer_error_sink): New class.
	(selftest::lexer_error_sink::s_singleton): New global.
	(selftest::lexer_test::lexer_test): Initialize new field
	"m_implicitly_expect_EOF".
	(selftest::lexer_test::~lexer_test): Conditionalize the
	check for the EOF token on the new field.
	(selftest::test_lexer_string_locations_raw_string_unterminated):
	New function.
	(selftest::input_c_tests): Call the new test.

libcpp/ChangeLog:
	PR preprocessor/78680
	PR preprocessor/78811
	* lex.c (_cpp_lex_direct): Only determine the end-location of
	the token and build a range for non-reserved start locations.
	Do not do it for EOF tokens.

From-SVN: r243721

Fix for PR preprocessor/78680

PR preprocessor/78680 identifies a crash when attempting to issue
a -Wformat warning, where the format string includes a string token
split across multiple physical source lines via backslash-continued
lines.

The issue is that libcpp is generating bogus range information for
such tokens.

For example, in:

void fn1() {
  __builtin_printf("\
     %ld.\n\
        2\n"); };

the range of the string token is printed as:

   __builtin_printf("\
                    ^~

whereas the range ought to be:

  __builtin_printf("\
                   ^~
     %ld.\n\
     ~~~~~~~
        2\n"); };
        ~~~~

The root cause is that the line notes expressing the update
of the buffer in lex.c aren't yet updated when the end-point of
the token is computed

3095	    tok_range.m_finish
3096	      = linemap_position_for_column (pfile->line_table,
3097					     CPP_BUF_COLUMN (buffer, buffer->cur));

so that the physical line is still regarded as that of the start
of the token, and, where CPP_BUF_COLUMN uses (BUF)->line_base,
line_base is still the location of the first physical line in the
and hence the column information is too large (as if it were the
offset in the *logical* line).

(the printed range is somewhat misleading; the actual buggy range
extends beyond the "\ in the line, but within diagnostic-show-locus.c
layout::print_annotation_line only prints up to the xbound set by
layout::print_source_line and so truncates most of the buggy range).

The fix is to ensure that line notes are handled before calculating
the end-point of the token range.

This leads to the range for the string token being correctly
computed, as:

  __builtin_printf("\
                   ^~
     %ld.\n\
     ~~~~~~~
        2\n"); };
        ~~~~

and this leads to get_substring_ranges_for_loc failing gracefully,
rather than crashing.

gcc/testsuite/ChangeLog:
	PR preprocessor/78680
	* gcc.dg/format/pr78680.c: New test case.
	* gcc.dg/plugin/diagnostic-test-expressions-1.c
	(test_multiline_token): New function.
	* gcc.dg/plugin/diagnostic-test-string-literals-1.c
	(test_backslash_continued_logical_lines): New function.

libcpp/ChangeLog:
	PR preprocessor/78680
	* lex.c (_cpp_lex_direct): Ensure line notes are processed before
	computing the end-point of the token.

From-SVN: r243567

gcc:
2016-11-23  Paolo Bonzini  <bonzini@gnu.org>

	* system.h (HAVE_DESIGNATED_INITIALIZERS,
	HAVE_DESIGNATED_UNION_INITIALIZERS): Do not use
	"defined" in macros.
	* doc/cpp.texi (Defined): Mention -Wexpansion-to-defined.
	* doc/cppopts.texi (Invocation): Document -Wexpansion-to-defined.
	* doc/invoke.texi (Warning Options): Document -Wexpansion-to-defined.

gcc/c-family:
2016-11-23  Paolo Bonzini  <bonzini@gnu.org>

	* c.opt (Wexpansion-to-defined): New.

gcc/testsuite:
2016-11-23  Paolo Bonzini  <bonzini@gnu.org>

	* gcc.dg/cpp/defined.c: Mark newly introduced warnings and
	adjust for warning->pedwarn change.
	* gcc.dg/cpp/defined-syshdr.c,
	gcc.dg/cpp/defined-Wexpansion-to-defined.c,
	gcc.dg/cpp/defined-Wextra-Wno-expansion-to-defined.c,
	gcc.dg/cpp/defined-Wextra.c,
	gcc.dg/cpp/defined-Wno-expansion-to-defined.c: New testcases.

libcpp:
2016-11-23  Paolo Bonzini  <bonzini@gnu.org>

	* include/cpplib.h (struct cpp_options): Add new member
	warn_expansion_to_defined.
	(CPP_W_EXPANSION_TO_DEFINED): New enum member.
	* expr.c (parse_defined): Warn for all uses of "defined"
	in macros, and tie warning to CPP_W_EXPANSION_TO_DEFINED.
	Make it a pedwarning instead of a warning.
	* system.h (HAVE_DESIGNATED_INITIALIZERS): Do not use
	"defined" in macros.

From-SVN: r242743

Whilst investigating PR preprocessor/78324 I noticed that the
substring location code currently doesn't handle raw strings
correctly, by not skipping the 'R', opening quote, delimiter
and opening parenthesis.

For example, an attempt to underline chars 4-7 with caret at 6 of
this raw string yields this erroneous output:
   __emit_string_literal_range (R"foo(0123456789)foo",
                                    ~~^~

With the patch, the correct range/caret is printed:

   __emit_string_literal_range (R"foo(0123456789)foo",
                                          ~~^~

gcc/ChangeLog:
	* input.c (selftest::test_lexer_string_locations_long_line): New
	function.
	(selftest::test_lexer_string_locations_raw_string_multiline): New
	function.
	(selftest::input_c_tests): Call the new functions, via
	for_each_line_table_case.

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/diagnostic-test-string-literals-1.c
	(test_raw_string_one_liner): New function.
	(test_raw_string_multiline): New function.

libcpp/ChangeLog:
	* charset.c (cpp_interpret_string_1): Skip locations from
	loc_reader when advancing 'p' when handling raw strings.

From-SVN: r242552

	PR bootstrap/72823
	* configure.ac (ENABLE_ASSERT_CHECKING): Define if gcc configure
	would define that macro.
	* configure: Regenerated.
	* config.in: Regenerated.

From-SVN: r242510

	  * lex.c (search_line_fast): New implementation for AArch64.

From-SVN: r241964

From-SVN: r241673

Running "make selftest-valgrind" showed various leaks of the form:

408 bytes in 24 blocks are definitely lost in loss record 572 of 679
   at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x1B0D057: xmalloc (xmalloc.c:148)
   by 0x1ACCAA1: append_file_to_dir(char const*, cpp_dir*) [clone .isra.3] (files.c:1567)
   by 0x1ACD56F: _cpp_find_file (files.c:390)
   by 0x1ACF8FB: cpp_read_main_file(cpp_reader*, char const*) (init.c:632)
   by 0x1AB3D97: selftest::lexer_test::lexer_test(selftest::line_table_case const&, char const*, selftest::lexer_test_options*) (input.c:2014)
   by 0x1AB792B: selftest::test_lexer_string_locations_u8(selftest::line_table_case const&) (input.c:2713)
   by 0x1ABA22A: selftest::for_each_line_table_case(void (*)(selftest::line_table_case const&)) (input.c:3227)
   by 0x1ABA381: selftest::input_c_tests() (input.c:3260)
   by 0x1A295F1: selftest::run_tests() (selftest-run-tests.c:62)
   by 0xF20DC4: toplev::run_self_tests() (toplev.c:2076)
   by 0xF20FCD: toplev::main(int, char**) (toplev.c:2153)

Fix the leak by freeing the file->path in destroy_cpp_file.
However, doing so would lead to a use-after-free in input.c's file cache
since the filenames in this cache are the libcpp file->path buffers.

Hence we need to ensure that any references to the file in the input.c
cache are purged before cleaning up file->path.  This is normally done
by the temp_source_file dtor.  Hence we need to reorder things to that
the temp_source_file dtor runs before cleaning up the cpp_parser.  The
patch does this by introducing a wrapper class around cpp_parser *, so
that the dtor can run after the dtor for temp_source_file.

gcc/ChangeLog:
	* input.c (fcache::file_patch): Add comment about lifetime.
	(selftest::cpp_reader_ptr): New class.
	(selftest::lexer_test): Convert m_parser from cpp_reader *
	to a cpp_reader_ptr, and move m_tempfile to after it.
	(selftest::lexer_test::lexer_test): Update for above reordering.
	(lexer_test::~lexer_test): Move cleanup of m_parser to
	cpp_reader_ptr's dtor.

libcpp/ChangeLog:
	* files.c (destroy_cpp_file): Free file->path.

From-SVN: r241536

line_maps instances such as the global line_table are
GC-managed, but the htab within location_adhoc_data_map.htab
is not GC-managed.

Previously this was deleted manually by a call to
location_adhoc_data_fini within toplev::main.

However, on adding a call to forcibly_ggc_collect after the
selftests, all of the htabs for the various line_tables
created during the selftests start showing up as leaks
in "make selftest-valgrind", e.g.:

13,536 (1,344 direct, 12,192 indirect) bytes in 12 blocks are definitely lost in loss record 1,065 of 1,086
   at 0x4A081D4: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x16DB3B0: xcalloc (xmalloc.c:163)
   by 0x16D8D34: htab_create_typed_alloc (hashtab.c:358)
   by 0x16D8DBD: htab_create_alloc (hashtab.c:286)
   by 0x16A2CCC: linemap_init(line_maps*, unsigned int) (line-map.c:353)
   by 0x1685605: selftest::line_table_test::line_table_test(selftest::line_table_case const&) (input.c:1624)
   by 0x167D09C: selftest::test_applying_fixits_modernize_named_init(selftest::line_table_case const&) (edit-context.c:1430)
   by 0x1686827: selftest::for_each_line_table_case(void (*)(selftest::line_table_case const&)) (input.c:3227)
   by 0x167F067: selftest::edit_context_c_tests() (edit-context.c:1658)
   by 0x1616E67: selftest::run_tests() (selftest-run-tests.c:71)
   by 0xC0DB25: toplev::run_self_tests() (toplev.c:2076)
   by 0x618EB4: toplev::main(int, char**) (toplev.c:2153)

This patch removes the manual one-time cleanup in favor of
adding a destructor to class line_maps, which cleans up
the non-GC-managed htab.

Doing so improves "make selftest-valgrind" from:

==61118== LEAK SUMMARY:
==61118==    definitely lost: 121,248 bytes in 1,515 blocks
==61118==    indirectly lost: 974,344 bytes in 959 blocks
==61118==      possibly lost: 0 bytes in 0 blocks
==61118==    still reachable: 1,332,599 bytes in 3,684 blocks
==61118==         suppressed: 0 bytes in 0 blocks

to:

==57182== LEAK SUMMARY:
==57182==    definitely lost: 13,840 bytes in 556 blocks
==57182==    indirectly lost: 0 bytes in 0 blocks
==57182==      possibly lost: 0 bytes in 0 blocks
==57182==    still reachable: 1,355,703 bytes in 3,684 blocks
==57182==         suppressed: 0 bytes in 0 blocks

gcc/ChangeLog:
	* toplev.c (toplev::main): Remove call to
	location_adhoc_data_fini.

libcpp/ChangeLog:
	* include/line-map.h (line_maps::~line_maps): New dtor.
	(location_adhoc_data_fini): Delete decl.
	* line-map.c (line_maps::~line_maps): New dtor.
	(location_adhoc_data_fini): Delete.

From-SVN: r241533

2016-10-21  Andris Pavenis  <andris.pavenis@iki.fi>

	PR preprocessor/71681
	* files.c (remap_filename): Fix handling -remap in subdirectories.

From-SVN: r241413

	* common.opt (Wimplicit-fallthrough) Turn into alias to
	-Wimplicit-fallthrough=3.  Remove EnabledBy.
	(Wimplicit-fallthrough=): New option.
	* gimplify.c (warn_implicit_fallthrough_r): Use
	OPT_Wimplicit_fallthrough_ instead of OPT_Wimplicit_fallthrough.
	* doc/invoke.texi (-Wimplicit-fallthrough): Document as alias
	to -Wimplicit-fallthrough=3.
	(-Wimplicit-fallthrough=): Document.
gcc/c-family/
	* c.opt (Wextra): Add as C/C++/ObjC/ObjC++ option.
	(Wimplicit-fallthrough=): Enable for these languages by -Wextra.
	* c-opts.c (sanitize_cpp_opts): Initialize
	cpp_opts->cpp_warn_implicit_fallthrough.
gcc/testsuite/
	* c-c++-common/Wimplicit-fallthrough-25.c: New test.
	* c-c++-common/Wimplicit-fallthrough-26.c: New test.
	* c-c++-common/Wimplicit-fallthrough-27.c: New test.
	* c-c++-common/Wimplicit-fallthrough-28.c: New test.
	* c-c++-common/Wimplicit-fallthrough-29.c: New test.
	* c-c++-common/Wimplicit-fallthrough-30.c: New test.
	* c-c++-common/Wimplicit-fallthrough-31.c: New test.
	* c-c++-common/Wimplicit-fallthrough-32.c: New test.
	* c-c++-common/Wimplicit-fallthrough-33.c: New test.
libcpp/
	* include/cpplib.h (struct cpp_options): Add
	cpp_warn_implicit_fallthrough.
	* init.c (cpp_create_reader): Initialize it to 0.
	* lex.c (fallthrough_comment_p): Handle different
	cpp_warn_implicit_fallthrough levels.  Whitespace fixes.

From-SVN: r241013

	* doc/invoke.texi: Document accepting Else, fallthrough.

	* lex.c (fallthrough_comment_p): Accept Else, fallthrough.

	* c-c++-common/Wimplicit-fallthrough-23.c (foo): Add further tests.

From-SVN: r240886

	* doc/invoke.texi (-Wimplicit-fallthrough): Document FALLTHRU comment
	style changes.

	* lex.c (fallthrough_comment_p): Extend to handle more common FALLTHRU
	comment styles.

	* c-c++-common/Wimplicit-fallthrough-23.c (foo): Add further tests.

From-SVN: r240885

	* c-lex.c (c_lex_with_flags) <case CPP_COMMENT>: For CPP_COMMENT
	token with PREV_FALLTHROUGH, skip all following CPP_PADDING and
	CPP_COMMENT tokens and set add_flags to PREV_FALLTHROUGH afterwards.

	* doc/invoke.texi (-Wimplicit-fallthrough): Document the accepted
	FALLTHRU comment styles.

	* lex.c (fallthrough_comment_p): Fix off-by-one size comparison
	errors, cleanup.
	(_cpp_lex_direct): Allow arbitrary comments in between
	fallthrough_comment_p comment and following token.

	* c-c++-common/Wimplicit-fallthrough-23.c: New test.
	* c-c++-common/Wimplicit-fallthrough-24.c: New test.

From-SVN: r240884

libcpp/ChangeLog:

2016-10-04  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	PR target/77847
	* lex.c (search_line_fast): Add a FALLTHROUGH comment to correct
	compiler error in the version of this function that is
	conditionally compiled when GCC_VERSION >= 4005 and both
	__ALTIVEC__ and __BIG_ENDIAN__ symbols are defined.

From-SVN: r240783

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r240485

substring_loc::get_location currently fails for the final terminator
character in a STRING_CST from the C frontend, so that format_warning_va
falls back to using the location of the string as a whole.

This patch tweaks things [1] so that we use the final closing quote
as the location of the terminator character, as requested in
PR preprocessor/77672.

[1] specifically, cpp_interpret_string_1.

gcc/ChangeLog:
	PR preprocessor/77672
	* input.c (selftest::test_lexer_string_locations_simple): Update
	test to expect location information of the terminator character
	at the location of the final closing quote.
	(selftest::test_lexer_string_locations_hex): Likewise.
	(selftest::test_lexer_string_locations_oct): Likewise.
	(selftest::test_lexer_string_locations_letter_escape_1): Likewise.
	(selftest::test_lexer_string_locations_letter_escape_2): Likewise.
	(selftest::test_lexer_string_locations_ucn4): Likewise.
	(selftest::test_lexer_string_locations_ucn8): Likewise.
	(selftest::test_lexer_string_locations_u8): Likewise.
	(selftest::test_lexer_string_locations_utf8_source): Likewise.
	(selftest::test_lexer_string_locations_concatenation_1): Likewise.
	(selftest::test_lexer_string_locations_concatenation_2): Likewise.
	(selftest::test_lexer_string_locations_concatenation_3): Likewise.
	(selftest::test_lexer_string_locations_macro): Likewise.
	(selftest::test_lexer_string_locations_long_line): Likewise.

gcc/testsuite/ChangeLog:
	PR preprocessor/77672
	* gcc.dg/plugin/diagnostic-test-string-literals-1.c
	(test_terminator_location): New function.

libcpp/ChangeLog:
	PR preprocessor/77672
	* charset.c (cpp_interpret_string_1): Add a source_range for the
	NUL-terminator, using the location of the trailing quote of the
	final string.

From-SVN: r240434

gcc/
	* input.h (from_macro_definition_at): New.
libcpp/
	* line-map.c (linemap_location_from_macro_definition_p): New.
	* line-map.h: Declare it.

From-SVN: r240330

I hope to implement newline support within fix-it hints at some point,
but currently it's not supported, and leads to misleading diagnostic
output, so for now, fail gracefully.

gcc/ChangeLog:
	* diagnostic-show-locus.c
	(selftest::test_fixit_insert_containing_newline): New function.
	(selftest::test_fixit_replace_containing_newline): New function.
	(selftest::diagnostic_show_locus_c_tests): Call the above.

libcpp/ChangeLog:
	* include/line-map.h (class rich_location): Note that newlines
	aren't supported in fix-it text.
	* line-map.c (rich_location::add_fixit_insert_before): Reject
	attempts to add fix-its containing newlines.
	(rich_location::add_fixit_replace): Likewise.

From-SVN: r240169