Initial commit of analyzer

This patch adds a static analysis pass to the middle-end, focusing
for this release on C code, and malloc/free issues in particular.

See:
 https://gcc.gnu.org/wiki/DavidMalcolm/StaticAnalyzer

gcc/ChangeLog:
	* Makefile.in (lang_opt_files): Add analyzer.opt.
	(ANALYZER_OBJS): New.
	(OBJS): Add digraph.o, graphviz.o, ordered-hash-map-tests.o,
	tristate.o and ANALYZER_OBJS.
	(TEXI_GCCINT_FILES): Add analyzer.texi.
	* common.opt (-fanalyzer): New driver option.
	* config.in: Regenerate.
	* configure: Regenerate.
	* configure.ac (--disable-analyzer, ENABLE_ANALYZER): New option.
	(gccdepdir): Also create depdir for "analyzer" subdir.
	* digraph.cc: New file.
	* digraph.h: New file.
	* doc/analyzer.texi: New file.
	* doc/gccint.texi ("Static Analyzer") New menu item.
	(analyzer.texi): Include it.
	* doc/invoke.texi ("Static Analyzer Options"): New list and new section.
	("Warning Options"): Add static analysis warnings to the list.
	(-Wno-analyzer-double-fclose): New option.
	(-Wno-analyzer-double-free): New option.
	(-Wno-analyzer-exposure-through-output-file): New option.
	(-Wno-analyzer-file-leak): New option.
	(-Wno-analyzer-free-of-non-heap): New option.
	(-Wno-analyzer-malloc-leak): New option.
	(-Wno-analyzer-possible-null-argument): New option.
	(-Wno-analyzer-possible-null-dereference): New option.
	(-Wno-analyzer-null-argument): New option.
	(-Wno-analyzer-null-dereference): New option.
	(-Wno-analyzer-stale-setjmp-buffer): New option.
	(-Wno-analyzer-tainted-array-index): New option.
	(-Wno-analyzer-use-after-free): New option.
	(-Wno-analyzer-use-of-pointer-in-stale-stack-frame): New option.
	(-Wno-analyzer-use-of-uninitialized-value): New option.
	(-Wanalyzer-too-complex): New option.
	(-fanalyzer-call-summaries): New warning.
	(-fanalyzer-checker=): New warning.
	(-fanalyzer-fine-grained): New warning.
	(-fno-analyzer-state-merge): New warning.
	(-fno-analyzer-state-purge): New warning.
	(-fanalyzer-transitivity): New warning.
	(-fanalyzer-verbose-edges): New warning.
	(-fanalyzer-verbose-state-changes): New warning.
	(-fanalyzer-verbosity=): New warning.
	(-fdump-analyzer): New warning.
	(-fdump-analyzer-callgraph): New warning.
	(-fdump-analyzer-exploded-graph): New warning.
	(-fdump-analyzer-exploded-nodes): New warning.
	(-fdump-analyzer-exploded-nodes-2): New warning.
	(-fdump-analyzer-exploded-nodes-3): New warning.
	(-fdump-analyzer-supergraph): New warning.
	* doc/sourcebuild.texi (dg-require-dot): New.
	(dg-check-dot): New.
	* gdbinit.in (break-on-saved-diagnostic): New command.
	* graphviz.cc: New file.
	* graphviz.h: New file.
	* ordered-hash-map-tests.cc: New file.
	* ordered-hash-map.h: New file.
	* passes.def (pass_analyzer): Add before
	pass_ipa_whole_program_visibility.
	* selftest-run-tests.c (selftest::run_tests): Call
	selftest::ordered_hash_map_tests_cc_tests.
	* selftest.h (selftest::ordered_hash_map_tests_cc_tests): New
	decl.
	* shortest-paths.h: New file.
	* timevar.def (TV_ANALYZER): New timevar.
	(TV_ANALYZER_SUPERGRAPH): Likewise.
	(TV_ANALYZER_STATE_PURGE): Likewise.
	(TV_ANALYZER_PLAN): Likewise.
	(TV_ANALYZER_SCC): Likewise.
	(TV_ANALYZER_WORKLIST): Likewise.
	(TV_ANALYZER_DUMP): Likewise.
	(TV_ANALYZER_DIAGNOSTICS): Likewise.
	(TV_ANALYZER_SHORTEST_PATHS): Likewise.
	* tree-pass.h (make_pass_analyzer): New decl.
	* tristate.cc: New file.
	* tristate.h: New file.

gcc/analyzer/ChangeLog:
	* ChangeLog: New file.
	* analyzer-selftests.cc: New file.
	* analyzer-selftests.h: New file.
	* analyzer.opt: New file.
	* analysis-plan.cc: New file.
	* analysis-plan.h: New file.
	* analyzer-logging.cc: New file.
	* analyzer-logging.h: New file.
	* analyzer-pass.cc: New file.
	* analyzer.cc: New file.
	* analyzer.h: New file.
	* call-string.cc: New file.
	* call-string.h: New file.
	* checker-path.cc: New file.
	* checker-path.h: New file.
	* constraint-manager.cc: New file.
	* constraint-manager.h: New file.
	* diagnostic-manager.cc: New file.
	* diagnostic-manager.h: New file.
	* engine.cc: New file.
	* engine.h: New file.
	* exploded-graph.h: New file.
	* pending-diagnostic.cc: New file.
	* pending-diagnostic.h: New file.
	* program-point.cc: New file.
	* program-point.h: New file.
	* program-state.cc: New file.
	* program-state.h: New file.
	* region-model.cc: New file.
	* region-model.h: New file.
	* sm-file.cc: New file.
	* sm-malloc.cc: New file.
	* sm-malloc.dot: New file.
	* sm-pattern-test.cc: New file.
	* sm-sensitive.cc: New file.
	* sm-signal.cc: New file.
	* sm-taint.cc: New file.
	* sm.cc: New file.
	* sm.h: New file.
	* state-purge.cc: New file.
	* state-purge.h: New file.
	* supergraph.cc: New file.
	* supergraph.h: New file.

gcc/testsuite/ChangeLog:
	* gcc.dg/analyzer/CVE-2005-1689-minimal.c: New test.
	* gcc.dg/analyzer/abort.c: New test.
	* gcc.dg/analyzer/alloca-leak.c: New test.
	* gcc.dg/analyzer/analyzer-decls.h: New header.
	* gcc.dg/analyzer/analyzer-verbosity-0.c: New test.
	* gcc.dg/analyzer/analyzer-verbosity-1.c: New test.
	* gcc.dg/analyzer/analyzer-verbosity-2.c: New test.
	* gcc.dg/analyzer/analyzer.exp: New suite.
	* gcc.dg/analyzer/attribute-nonnull.c: New test.
	* gcc.dg/analyzer/call-summaries-1.c: New test.
	* gcc.dg/analyzer/conditionals-2.c: New test.
	* gcc.dg/analyzer/conditionals-3.c: New test.
	* gcc.dg/analyzer/conditionals-notrans.c: New test.
	* gcc.dg/analyzer/conditionals-trans.c: New test.
	* gcc.dg/analyzer/data-model-1.c: New test.
	* gcc.dg/analyzer/data-model-2.c: New test.
	* gcc.dg/analyzer/data-model-3.c: New test.
	* gcc.dg/analyzer/data-model-4.c: New test.
	* gcc.dg/analyzer/data-model-5.c: New test.
	* gcc.dg/analyzer/data-model-5b.c: New test.
	* gcc.dg/analyzer/data-model-5c.c: New test.
	* gcc.dg/analyzer/data-model-5d.c: New test.
	* gcc.dg/analyzer/data-model-6.c: New test.
	* gcc.dg/analyzer/data-model-7.c: New test.
	* gcc.dg/analyzer/data-model-8.c: New test.
	* gcc.dg/analyzer/data-model-9.c: New test.
	* gcc.dg/analyzer/data-model-11.c: New test.
	* gcc.dg/analyzer/data-model-12.c: New test.
	* gcc.dg/analyzer/data-model-13.c: New test.
	* gcc.dg/analyzer/data-model-14.c: New test.
	* gcc.dg/analyzer/data-model-15.c: New test.
	* gcc.dg/analyzer/data-model-16.c: New test.
	* gcc.dg/analyzer/data-model-17.c: New test.
	* gcc.dg/analyzer/data-model-18.c: New test.
	* gcc.dg/analyzer/data-model-19.c: New test.
	* gcc.dg/analyzer/data-model-path-1.c: New test.
	* gcc.dg/analyzer/disabling.c: New test.
	* gcc.dg/analyzer/dot-output.c: New test.
	* gcc.dg/analyzer/double-free-lto-1-a.c: New test.
	* gcc.dg/analyzer/double-free-lto-1-b.c: New test.
	* gcc.dg/analyzer/double-free-lto-1.h: New header.
	* gcc.dg/analyzer/equivalence.c: New test.
	* gcc.dg/analyzer/explode-1.c: New test.
	* gcc.dg/analyzer/explode-2.c: New test.
	* gcc.dg/analyzer/factorial.c: New test.
	* gcc.dg/analyzer/fibonacci.c: New test.
	* gcc.dg/analyzer/fields.c: New test.
	* gcc.dg/analyzer/file-1.c: New test.
	* gcc.dg/analyzer/file-2.c: New test.
	* gcc.dg/analyzer/function-ptr-1.c: New test.
	* gcc.dg/analyzer/function-ptr-2.c: New test.
	* gcc.dg/analyzer/function-ptr-3.c: New test.
	* gcc.dg/analyzer/gzio-2.c: New test.
	* gcc.dg/analyzer/gzio-3.c: New test.
	* gcc.dg/analyzer/gzio-3a.c: New test.
	* gcc.dg/analyzer/gzio.c: New test.
	* gcc.dg/analyzer/infinite-recursion.c: New test.
	* gcc.dg/analyzer/loop-2.c: New test.
	* gcc.dg/analyzer/loop-2a.c: New test.
	* gcc.dg/analyzer/loop-3.c: New test.
	* gcc.dg/analyzer/loop-4.c: New test.
	* gcc.dg/analyzer/loop.c: New test.
	* gcc.dg/analyzer/malloc-1.c: New test.
	* gcc.dg/analyzer/malloc-2.c: New test.
	* gcc.dg/analyzer/malloc-3.c: New test.
	* gcc.dg/analyzer/malloc-callbacks.c: New test.
	* gcc.dg/analyzer/malloc-dce.c: New test.
	* gcc.dg/analyzer/malloc-dedupe-1.c: New test.
	* gcc.dg/analyzer/malloc-ipa-1.c: New test.
	* gcc.dg/analyzer/malloc-ipa-10.c: New test.
	* gcc.dg/analyzer/malloc-ipa-11.c: New test.
	* gcc.dg/analyzer/malloc-ipa-12.c: New test.
	* gcc.dg/analyzer/malloc-ipa-13.c: New test.
	* gcc.dg/analyzer/malloc-ipa-2.c: New test.
	* gcc.dg/analyzer/malloc-ipa-3.c: New test.
	* gcc.dg/analyzer/malloc-ipa-4.c: New test.
	* gcc.dg/analyzer/malloc-ipa-5.c: New test.
	* gcc.dg/analyzer/malloc-ipa-6.c: New test.
	* gcc.dg/analyzer/malloc-ipa-7.c: New test.
	* gcc.dg/analyzer/malloc-ipa-8-double-free.c: New test.
	* gcc.dg/analyzer/malloc-ipa-8-lto-a.c: New test.
	* gcc.dg/analyzer/malloc-ipa-8-lto-b.c: New test.
	* gcc.dg/analyzer/malloc-ipa-8-lto-c.c: New test.
	* gcc.dg/analyzer/malloc-ipa-8-lto.h: New test.
	* gcc.dg/analyzer/malloc-ipa-8-unchecked.c: New test.
	* gcc.dg/analyzer/malloc-ipa-9.c: New test.
	* gcc.dg/analyzer/malloc-macro-inline-events.c: New test.
	* gcc.dg/analyzer/malloc-macro-separate-events.c: New test.
	* gcc.dg/analyzer/malloc-macro.h: New header.
	* gcc.dg/analyzer/malloc-many-paths-1.c: New test.
	* gcc.dg/analyzer/malloc-many-paths-2.c: New test.
	* gcc.dg/analyzer/malloc-many-paths-3.c: New test.
	* gcc.dg/analyzer/malloc-paths-1.c: New test.
	* gcc.dg/analyzer/malloc-paths-10.c: New test.
	* gcc.dg/analyzer/malloc-paths-2.c: New test.
	* gcc.dg/analyzer/malloc-paths-3.c: New test.
	* gcc.dg/analyzer/malloc-paths-4.c: New test.
	* gcc.dg/analyzer/malloc-paths-5.c: New test.
	* gcc.dg/analyzer/malloc-paths-6.c: New test.
	* gcc.dg/analyzer/malloc-paths-7.c: New test.
	* gcc.dg/analyzer/malloc-paths-8.c: New test.
	* gcc.dg/analyzer/malloc-paths-9.c: New test.
	* gcc.dg/analyzer/malloc-vs-local-1a.c: New test.
	* gcc.dg/analyzer/malloc-vs-local-1b.c: New test.
	* gcc.dg/analyzer/malloc-vs-local-2.c: New test.
	* gcc.dg/analyzer/malloc-vs-local-3.c: New test.
	* gcc.dg/analyzer/malloc-vs-local-4.c: New test.
	* gcc.dg/analyzer/operations.c: New test.
	* gcc.dg/analyzer/params-2.c: New test.
	* gcc.dg/analyzer/params.c: New test.
	* gcc.dg/analyzer/paths-1.c: New test.
	* gcc.dg/analyzer/paths-1a.c: New test.
	* gcc.dg/analyzer/paths-2.c: New test.
	* gcc.dg/analyzer/paths-3.c: New test.
	* gcc.dg/analyzer/paths-4.c: New test.
	* gcc.dg/analyzer/paths-5.c: New test.
	* gcc.dg/analyzer/paths-6.c: New test.
	* gcc.dg/analyzer/paths-7.c: New test.
	* gcc.dg/analyzer/pattern-test-1.c: New test.
	* gcc.dg/analyzer/pattern-test-2.c: New test.
	* gcc.dg/analyzer/pointer-merging.c: New test.
	* gcc.dg/analyzer/pr61861.c: New test.
	* gcc.dg/analyzer/pragma-1.c: New test.
	* gcc.dg/analyzer/scope-1.c: New test.
	* gcc.dg/analyzer/sensitive-1.c: New test.
	* gcc.dg/analyzer/setjmp-1.c: New test.
	* gcc.dg/analyzer/setjmp-2.c: New test.
	* gcc.dg/analyzer/setjmp-3.c: New test.
	* gcc.dg/analyzer/setjmp-4.c: New test.
	* gcc.dg/analyzer/setjmp-5.c: New test.
	* gcc.dg/analyzer/setjmp-6.c: New test.
	* gcc.dg/analyzer/setjmp-7.c: New test.
	* gcc.dg/analyzer/setjmp-7a.c: New test.
	* gcc.dg/analyzer/setjmp-8.c: New test.
	* gcc.dg/analyzer/setjmp-9.c: New test.
	* gcc.dg/analyzer/signal-1.c: New test.
	* gcc.dg/analyzer/signal-2.c: New test.
	* gcc.dg/analyzer/signal-3.c: New test.
	* gcc.dg/analyzer/signal-4a.c: New test.
	* gcc.dg/analyzer/signal-4b.c: New test.
	* gcc.dg/analyzer/strcmp-1.c: New test.
	* gcc.dg/analyzer/switch.c: New test.
	* gcc.dg/analyzer/taint-1.c: New test.
	* gcc.dg/analyzer/zlib-1.c: New test.
	* gcc.dg/analyzer/zlib-2.c: New test.
	* gcc.dg/analyzer/zlib-3.c: New test.
	* gcc.dg/analyzer/zlib-4.c: New test.
	* gcc.dg/analyzer/zlib-5.c: New test.
	* gcc.dg/analyzer/zlib-6.c: New test.
	* lib/gcc-defs.exp (dg-check-dot): New procedure.
	* lib/target-supports.exp (check_dot_available): New procedure.
	(check_effective_target_analyzer): New.
	* lib/target-supports-dg.exp (dg-require-dot): New procedure.

1 files changed, 224 insertions, 0 deletions

diff --git a/gcc/analyzer/analyzer-logging.cc b/gcc/analyzer/analyzer-logging.cc
new file mode 100644
index 0000000..9a6b36e
--- /dev/null
+++ b/gcc/analyzer/analyzer-logging.cc
@@ -0,0 +1,224 @@
+/* Hierarchical log messages for the analyzer.
+   Copyright (C) 2014-2020 Free Software Foundation, Inc.
+   Contributed by David Malcolm <dmalcolm@redhat.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "toplev.h" /* for print_version */
+#include "pretty-print.h" /* for print_version */
+#include "diagnostic.h"
+#include "tree-diagnostic.h"
+
+#include "analyzer/analyzer-logging.h"
+
+#if ENABLE_ANALYZER
+
+/* Implementation of class logger.  */
+
+/* ctor for logger.  */
+
+logger::logger (FILE *f_out,
+		int, /* flags */
+		int /* verbosity */,
+		const pretty_printer &reference_pp) :
+  m_refcount (0),
+  m_f_out (f_out),
+  m_indent_level (0),
+  m_log_refcount_changes (false),
+  m_pp (reference_pp.clone ())
+{
+  pp_show_color (m_pp) = 0;
+  pp_buffer (m_pp)->stream = f_out;
+
+  /* %qE in logs for SSA_NAMEs should show the ssa names, rather than
+     trying to prettify things by showing the underlying var.  */
+  pp_format_decoder (m_pp) = default_tree_printer;
+
+  /* Begin the log by writing the GCC version.  */
+  print_version (f_out, "", false);
+}
+
+/* The destructor for logger, invoked via
+   the decref method when the refcount hits zero.
+   Note that we do not close the underlying FILE * (m_f_out).  */
+
+logger::~logger ()
+{
+  /* This should be the last message emitted.  */
+  log ("%s", __PRETTY_FUNCTION__);
+  gcc_assert (m_refcount == 0);
+  delete m_pp;
+}
+
+/* Increment the reference count of the logger.  */
+
+void
+logger::incref (const char *reason)
+{
+  m_refcount++;
+  if (m_log_refcount_changes)
+    log ("%s: reason: %s refcount now %i ",
+	 __PRETTY_FUNCTION__, reason, m_refcount);
+}
+
+/* Decrement the reference count of the logger,
+   deleting it if nothing is referring to it.  */
+
+void
+logger::decref (const char *reason)
+{
+  gcc_assert (m_refcount > 0);
+  --m_refcount;
+  if (m_log_refcount_changes)
+    log ("%s: reason: %s refcount now %i",
+	 __PRETTY_FUNCTION__, reason, m_refcount);
+  if (m_refcount == 0)
+    delete this;
+}
+
+/* Write a formatted message to the log, by calling the log_va method.  */
+
+void
+logger::log (const char *fmt, ...)
+{
+  va_list ap;
+  va_start (ap, fmt);
+  log_va (fmt, &ap);
+  va_end (ap);
+}
+
+/* Write an indented line to the log file.
+
+   We explicitly flush after each line: if something crashes the process,
+   we want the logfile/stream to contain the most up-to-date hint about the
+   last thing that was happening, without it being hidden in an in-process
+   buffer.  */
+
+void
+logger::log_va (const char *fmt, va_list *ap)
+{
+  start_log_line ();
+  log_va_partial (fmt, ap);
+  end_log_line ();
+}
+
+void
+logger::start_log_line ()
+{
+  for (int i = 0; i < m_indent_level; i++)
+    fputc (' ', m_f_out);
+}
+
+void
+logger::log_partial (const char *fmt, ...)
+{
+  va_list ap;
+  va_start (ap, fmt);
+  log_va_partial (fmt, &ap);
+  va_end (ap);
+}
+
+void
+logger::log_va_partial (const char *fmt, va_list *ap)
+{
+  text_info text;
+  text.format_spec = fmt;
+  text.args_ptr = ap;
+  text.err_no = 0;
+  pp_format (m_pp, &text);
+  pp_output_formatted_text (m_pp);
+}
+
+void
+logger::end_log_line ()
+{
+  pp_flush (m_pp);
+  pp_clear_output_area (m_pp);
+  fprintf (m_f_out, "\n");
+  fflush (m_f_out);
+}
+
+/* Record the entry within a particular scope, indenting subsequent
+   log lines accordingly.  */
+
+void
+logger::enter_scope (const char *scope_name)
+{
+  log ("entering: %s", scope_name);
+  m_indent_level += 1;
+}
+
+void
+logger::enter_scope (const char *scope_name, const char *fmt, va_list *ap)
+{
+  start_log_line ();
+  log_partial ("entering: %s: ", scope_name);
+  log_va_partial (fmt, ap);
+  end_log_line ();
+
+  m_indent_level += 1;
+}
+
+
+/* Record the exit from a particular scope, restoring the indent level to
+   before the scope was entered.  */
+
+void
+logger::exit_scope (const char *scope_name)
+{
+  if (m_indent_level)
+    m_indent_level -= 1;
+  else
+    log ("(mismatching indentation)");
+  log ("exiting: %s", scope_name);
+}
+
+/* Implementation of class log_user.  */
+
+/* The constructor for log_user.  */
+
+log_user::log_user (logger *logger) : m_logger (logger)
+{
+  if (m_logger)
+    m_logger->incref("log_user ctor");
+}
+
+/* The destructor for log_user.  */
+
+log_user::~log_user ()
+{
+  if (m_logger)
+    m_logger->decref("log_user dtor");
+}
+
+/* Set the logger for a log_user, managing the reference counts
+   of the old and new logger (either of which might be NULL).  */
+
+void
+log_user::set_logger (logger *logger)
+{
+  if (logger)
+    logger->incref ("log_user::set_logger");
+  if (m_logger)
+    m_logger->decref ("log_user::set_logger");
+  m_logger = logger;
+}
+
+#endif /* #if ENABLE_ANALYZER */