Prevent fix-it hints from affecting more than one line
Attempts to apply a removal or replacement fix-it hint to a source range that covers multiple lines currently lead to nonsensical results from the printing code in diagnostic-show-locus.c. We were already filtering them out in edit-context.c (leading to -fdiagnostics-generate-patch not generating any output for the whole TU). Reject attempts to add such fix-it hints within rich_location, fixing the diagnostic-show-locus.c issue. gcc/ChangeLog: * diagnostic-show-locus.c (selftest::test_fixit_deletion_affecting_newline): New function. (selftest::diagnostic_show_locus_c_tests): Call it. libcpp/ChangeLog: * include/line-map.h (class rich_location): Document that attempts to delete or replace a range *affecting* multiple lines will fail. * line-map.c (rich_location::maybe_add_fixit): Implement this restriction. From-SVN: r249403
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@ -1,3 +1,9 @@
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2017-06-20 David Malcolm <dmalcolm@redhat.com>
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* diagnostic-show-locus.c
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(selftest::test_fixit_deletion_affecting_newline): New function.
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(selftest::diagnostic_show_locus_c_tests): Call it.
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2017-06-20 Andreas Schwab <schwab@suse.de>
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PR target/80970
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@ -2793,6 +2793,53 @@ test_fixit_replace_containing_newline (const line_table_case &case_)
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pp_formatted_text (dc.printer));
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}
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/* Fix-it hint, attempting to delete a newline.
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This will fail, as we currently only support fix-it hints that
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affect one line at a time. */
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static void
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test_fixit_deletion_affecting_newline (const line_table_case &case_)
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{
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/* Create a tempfile and write some text to it.
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..........................0000000001111.
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..........................1234567890123. */
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const char *old_content = ("foo = bar (\n"
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" );\n");
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temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content);
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line_table_test ltt (case_);
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const line_map_ordinary *ord_map = linemap_check_ordinary
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(linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
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linemap_line_start (line_table, 1, 100);
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/* Attempt to delete the " (\n...)". */
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location_t start
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= linemap_position_for_line_and_column (line_table, ord_map, 1, 10);
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location_t caret
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= linemap_position_for_line_and_column (line_table, ord_map, 1, 11);
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location_t finish
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= linemap_position_for_line_and_column (line_table, ord_map, 2, 7);
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location_t loc = make_location (caret, start, finish);
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rich_location richloc (line_table, loc);
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richloc. add_fixit_remove ();
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/* Fix-it hints that affect more than one line are not yet supported, so
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the fix-it should not be displayed. */
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ASSERT_TRUE (richloc.seen_impossible_fixit_p ());
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if (finish > LINE_MAP_MAX_LOCATION_WITH_COLS)
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return;
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test_diagnostic_context dc;
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diagnostic_show_locus (&dc, &richloc, DK_ERROR);
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ASSERT_STREQ ("\n"
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" foo = bar (\n"
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" ~^\n"
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" );\n"
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" ~ \n",
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pp_formatted_text (dc.printer));
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}
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/* Run all of the selftests within this file. */
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void
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@ -2813,6 +2860,7 @@ diagnostic_show_locus_c_tests ()
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for_each_line_table_case (test_fixit_insert_containing_newline);
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for_each_line_table_case (test_fixit_insert_containing_newline_2);
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for_each_line_table_case (test_fixit_replace_containing_newline);
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for_each_line_table_case (test_fixit_deletion_affecting_newline);
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}
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} // namespace selftest
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@ -1,3 +1,10 @@
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2017-06-20 David Malcolm <dmalcolm@redhat.com>
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* include/line-map.h (class rich_location): Document that attempts
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to delete or replace a range *affecting* multiple lines will fail.
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* line-map.c (rich_location::maybe_add_fixit): Implement this
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restriction.
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2017-06-09 David Malcolm <dmalcolm@redhat.com>
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* include/line-map.h
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@ -1556,6 +1556,8 @@ class fixit_hint;
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inserting at the start of a line, and finishing with a newline
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(with no interior newline characters). Other attempts to add
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fix-it hints containing newline characters will fail.
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Similarly, attempts to delete or replace a range *affecting* multiple
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lines will fail.
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The rich_location API handles these failures gracefully, so that
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diagnostics can attempt to add fix-it hints without each needing
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@ -2327,6 +2327,25 @@ rich_location::maybe_add_fixit (source_location start,
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if (reject_impossible_fixit (next_loc))
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return;
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/* Only allow fix-it hints that affect a single line in one file.
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Compare the end-points. */
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expanded_location exploc_start
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= linemap_client_expand_location_to_spelling_point (start);
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expanded_location exploc_next_loc
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= linemap_client_expand_location_to_spelling_point (next_loc);
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/* They must be within the same file... */
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if (exploc_start.file != exploc_next_loc.file)
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{
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stop_supporting_fixits ();
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return;
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}
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/* ...and on the same line. */
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if (exploc_start.line != exploc_next_loc.line)
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{
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stop_supporting_fixits ();
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return;
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}
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const char *newline = strchr (new_content, '\n');
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if (newline)
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{
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@ -2342,8 +2361,6 @@ rich_location::maybe_add_fixit (source_location start,
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}
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/* The insertion must be at the start of a line. */
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expanded_location exploc_start
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= linemap_client_expand_location_to_spelling_point (start);
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if (exploc_start.column != 1)
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{
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stop_supporting_fixits ();
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