Fix memory leak of pretty_printer prefixes
We were rather sloppy about handling the ownership of prefixes for pretty_printer, and this lead to a memory leak for any time a diagnostic_show_locus call emits multiple line spans. This showed up in "make selftest-valgrind" as: 3,976 bytes in 28 blocks are definitely lost in loss record 632 of 669 at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) by 0x1F08227: xmalloc (xmalloc.c:147) by 0x1F083E6: xvasprintf (xvasprintf.c:58) by 0x1E7EC7D: build_message_string(char const*, ...) (diagnostic.c:78) by 0x1E7F438: diagnostic_get_location_text(diagnostic_context*, expanded_location) (diagnostic.c:328) by 0x1E7FD54: default_diagnostic_start_span_fn(diagnostic_context*, expanded_location) (diagnostic.c:626) by 0x1EB3508: selftest::test_diagnostic_context::start_span_cb(diagnostic_context*, expanded_location) (selftest-diagnostic.c:57) by 0x1E89215: diagnostic_show_locus(diagnostic_context*, rich_location*, diagnostic_t) (diagnostic-show-locus.c:1992) by 0x1E8ECAD: selftest::test_fixit_insert_containing_newline_2(selftest::line_table_case const&) (diagnostic-show-locus.c:3044) by 0x1EB0606: selftest::for_each_line_table_case(void (*)(selftest::line_table_case const&)) (input.c:3525) by 0x1E8F3F5: selftest::diagnostic_show_locus_c_tests() (diagnostic-show-locus.c:3164) by 0x1E010BF: selftest::run_tests() (selftest-run-tests.c:88) 4,004 bytes in 28 blocks are definitely lost in loss record 633 of 669 at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) by 0x1F08227: xmalloc (xmalloc.c:147) by 0x1F083E6: xvasprintf (xvasprintf.c:58) by 0x1E7EC7D: build_message_string(char const*, ...) (diagnostic.c:78) by 0x1E7F438: diagnostic_get_location_text(diagnostic_context*, expanded_location) (diagnostic.c:328) by 0x1E7FD54: default_diagnostic_start_span_fn(diagnostic_context*, expanded_location) (diagnostic.c:626) by 0x1EB3508: selftest::test_diagnostic_context::start_span_cb(diagnostic_context*, expanded_location) (selftest-diagnostic.c:57) by 0x1E89215: diagnostic_show_locus(diagnostic_context*, rich_location*, diagnostic_t) (diagnostic-show-locus.c:1992) by 0x1E8B373: selftest::test_diagnostic_show_locus_fixit_lines(selftest::line_table_case const&) (diagnostic-show-locus.c:2500) by 0x1EB0606: selftest::for_each_line_table_case(void (*)(selftest::line_table_case const&)) (input.c:3525) by 0x1E8F3B9: selftest::diagnostic_show_locus_c_tests() (diagnostic-show-locus.c:3159) by 0x1E010BF: selftest::run_tests() (selftest-run-tests.c:88) This patch fixes the leaks by ensuring that the pretty_printer "owns" the prefix if it's non-NULL, freeing it in the dtor and in pp_set_prefix. gcc/cp/ChangeLog: * error.c (cxx_print_error_function): Duplicate "file" before passing it to pp_set_prefix. (cp_print_error_function): Use pp_take_prefix when saving the existing prefix. gcc/ChangeLog: * diagnostic-show-locus.c (diagnostic_show_locus): Use pp_take_prefix when saving the existing prefix. * diagnostic.c (diagnostic_append_note): Likewise. * langhooks.c (lhd_print_error_function): Likewise. * pretty-print.c (pp_set_prefix): Drop the "const" from "prefix" param's type. Free the existing prefix. (pp_take_prefix): New function. (pretty_printer::pretty_printer): Drop the prefix parameter. Rename the length parameter to match the comment. (pretty_printer::~pretty_printer): Free the prefix. * pretty-print.h (pretty_printer::pretty_printer): Drop the prefix parameter. (struct pretty_printer): Drop the "const" from "prefix" field's type and clarify memory management. (pp_set_prefix): Drop the "const" from the 2nd param. (pp_take_prefix): New decl. From-SVN: r263275
This commit is contained in:
David Malcolm
David Malcolm
parent
74f9986eaf
commit
653fee1961
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@ -1,3 +1,22 @@
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2018-08-02 David Malcolm <dmalcolm@redhat.com>
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* diagnostic-show-locus.c (diagnostic_show_locus): Use
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pp_take_prefix when saving the existing prefix.
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* diagnostic.c (diagnostic_append_note): Likewise.
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* langhooks.c (lhd_print_error_function): Likewise.
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* pretty-print.c (pp_set_prefix): Drop the "const" from "prefix"
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param's type. Free the existing prefix.
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(pp_take_prefix): New function.
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(pretty_printer::pretty_printer): Drop the prefix parameter.
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Rename the length parameter to match the comment.
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(pretty_printer::~pretty_printer): Free the prefix.
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* pretty-print.h (pretty_printer::pretty_printer): Drop the prefix
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parameter.
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(struct pretty_printer): Drop the "const" from "prefix" field's
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type and clarify memory management.
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(pp_set_prefix): Drop the "const" from the 2nd param.
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(pp_take_prefix): New decl.
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2018-08-02 Aaron Sawdey <acsawdey@linux.ibm.com>
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* config/rs6000/rs6000-string.c (select_block_compare_mode): Move test
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@ -1,3 +1,10 @@
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2018-08-02 David Malcolm <dmalcolm@redhat.com>
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* error.c (cxx_print_error_function): Duplicate "file" before
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passing it to pp_set_prefix.
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(cp_print_error_function): Use pp_take_prefix when saving the
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existing prefix.
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2018-08-01 Martin Sebor <msebor@redhat.com>
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PR tree-optimization/86650
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@ -3287,8 +3287,13 @@ void
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cxx_print_error_function (diagnostic_context *context, const char *file,
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diagnostic_info *diagnostic)
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{
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char *prefix;
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if (file)
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prefix = xstrdup (file);
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else
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prefix = NULL;
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lhd_print_error_function (context, file, diagnostic);
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pp_set_prefix (context->printer, file);
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pp_set_prefix (context->printer, prefix);
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maybe_print_instantiation_context (context);
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}
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@ -3316,7 +3321,7 @@ cp_print_error_function (diagnostic_context *context,
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return;
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if (diagnostic_last_function_changed (context, diagnostic))
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{
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const char *old_prefix = context->printer->prefix;
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char *old_prefix = pp_take_prefix (context->printer);
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const char *file = LOCATION_FILE (diagnostic_location (diagnostic));
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tree abstract_origin = diagnostic_abstract_origin (diagnostic);
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char *new_prefix = (file && abstract_origin == NULL)
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@ -1978,7 +1978,7 @@ diagnostic_show_locus (diagnostic_context * context,
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context->last_location = loc;
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const char *saved_prefix = pp_get_prefix (context->printer);
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char *saved_prefix = pp_take_prefix (context->printer);
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pp_set_prefix (context->printer, NULL);
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layout layout (context, richloc, diagnostic_kind);
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@ -1063,7 +1063,6 @@ diagnostic_append_note (diagnostic_context *context,
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{
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diagnostic_info diagnostic;
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va_list ap;
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const char *saved_prefix;
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rich_location richloc (line_table, location);
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va_start (ap, gmsgid);
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@ -1073,7 +1072,7 @@ diagnostic_append_note (diagnostic_context *context,
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va_end (ap);
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return;
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}
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saved_prefix = pp_get_prefix (context->printer);
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char *saved_prefix = pp_take_prefix (context->printer);
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pp_set_prefix (context->printer,
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diagnostic_build_prefix (context, &diagnostic));
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pp_format (context->printer, &diagnostic.message);
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@ -369,7 +369,7 @@ lhd_print_error_function (diagnostic_context *context, const char *file,
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{
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if (diagnostic_last_function_changed (context, diagnostic))
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{
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const char *old_prefix = context->printer->prefix;
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char *old_prefix = pp_take_prefix (context->printer);
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tree abstract_origin = diagnostic_abstract_origin (diagnostic);
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char *new_prefix = (file && abstract_origin == NULL)
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? file_name_as_prefix (context, file) : NULL;
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@ -1482,23 +1482,38 @@ pp_clear_output_area (pretty_printer *pp)
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pp_buffer (pp)->line_length = 0;
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}
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/* Set PREFIX for PRETTY-PRINTER. */
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/* Set PREFIX for PRETTY-PRINTER, taking ownership of PREFIX, which
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will eventually be free-ed. */
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void
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pp_set_prefix (pretty_printer *pp, const char *prefix)
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pp_set_prefix (pretty_printer *pp, char *prefix)
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{
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free (pp->prefix);
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pp->prefix = prefix;
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pp_set_real_maximum_length (pp);
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pp->emitted_prefix = false;
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pp_indentation (pp) = 0;
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}
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/* Take ownership of PP's prefix, setting it to NULL.
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This allows clients to save, overide, and then restore an existing
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prefix, without it being free-ed. */
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char *
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pp_take_prefix (pretty_printer *pp)
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{
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char *result = pp->prefix;
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pp->prefix = NULL;
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return result;
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}
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/* Free PRETTY-PRINTER's prefix, a previously malloc()'d string. */
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void
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pp_destroy_prefix (pretty_printer *pp)
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{
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if (pp->prefix != NULL)
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{
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free (CONST_CAST (char *, pp->prefix));
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free (pp->prefix);
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pp->prefix = NULL;
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}
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}
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@ -1535,10 +1550,9 @@ pp_emit_prefix (pretty_printer *pp)
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}
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}
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/* Construct a PRETTY-PRINTER with PREFIX and of MAXIMUM_LENGTH
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characters per line. */
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/* Construct a PRETTY-PRINTER of MAXIMUM_LENGTH characters per line. */
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pretty_printer::pretty_printer (const char *p, int l)
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pretty_printer::pretty_printer (int maximum_length)
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: buffer (new (XCNEW (output_buffer)) output_buffer ()),
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prefix (),
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padding (pp_none),
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@ -1552,10 +1566,10 @@ pretty_printer::pretty_printer (const char *p, int l)
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translate_identifiers (true),
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show_color ()
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{
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pp_line_cutoff (this) = l;
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pp_line_cutoff (this) = maximum_length;
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/* By default, we emit prefixes once per message. */
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pp_prefixing_rule (this) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
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pp_set_prefix (this, p);
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pp_set_prefix (this, NULL);
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}
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pretty_printer::~pretty_printer ()
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@ -1564,6 +1578,7 @@ pretty_printer::~pretty_printer ()
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delete m_format_postprocessor;
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buffer->~output_buffer ();
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XDELETE (buffer);
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free (prefix);
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}
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/* Append a string delimited by START and END to the output area of
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@ -215,17 +215,18 @@ class format_postprocessor
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and add additional fields they need. */
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struct pretty_printer
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{
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// Default construct a pretty printer with specified prefix
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// and a maximum line length cut off limit.
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explicit pretty_printer (const char* = NULL, int = 0);
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/* Default construct a pretty printer with specified
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maximum line length cut off limit. */
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explicit pretty_printer (int = 0);
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virtual ~pretty_printer ();
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/* Where we print external representation of ENTITY. */
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output_buffer *buffer;
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/* The prefix for each new line. */
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const char *prefix;
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/* The prefix for each new line. If non-NULL, this is "owned" by the
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pretty_printer, and will eventually be free-ed. */
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char *prefix;
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/* Where to put whitespace around the entity being formatted. */
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pp_padding padding;
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@ -338,7 +339,8 @@ pp_get_prefix (const pretty_printer *pp) { return pp->prefix; }
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#define pp_buffer(PP) (PP)->buffer
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extern void pp_set_line_maximum_length (pretty_printer *, int);
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extern void pp_set_prefix (pretty_printer *, const char *);
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extern void pp_set_prefix (pretty_printer *, char *);
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extern char *pp_take_prefix (pretty_printer *);
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extern void pp_destroy_prefix (pretty_printer *);
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extern int pp_remaining_character_count_for_line (pretty_printer *);
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extern void pp_clear_output_area (pretty_printer *);
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