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, 246 insertions, 0 deletions

diff --git a/gcc/digraph.h b/gcc/digraph.h
new file mode 100644
index 0000000..07b43ec
--- /dev/null
+++ b/gcc/digraph.h
@@ -0,0 +1,246 @@
+/* Template classes for directed graphs.
+   Copyright (C) 2019-2020 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/>.  */
+
+#ifndef GCC_DIGRAPH_H
+#define GCC_DIGRAPH_H
+
+#include "diagnostic.h"
+#include "tree-diagnostic.h" /* for default_tree_printer.  */
+#include "graphviz.h"
+
+/* Templates for a family of classes: digraph, node, edge, and cluster.
+   This assumes a traits type with the following typedefs:
+   node_t: the node class
+   edge_t: the edge class
+   dump_args_t: additional args for dot-dumps
+   cluster_t: the cluster class (for use when generating .dot files).
+
+   Using a template allows for typesafe nodes and edges: a node's
+   predecessor and successor edges can be of a node-specific edge
+   subclass, without needing casting.  */
+
+/* Abstract base class for a node in a directed graph.  */
+
+template <typename GraphTraits>
+class dnode
+{
+ public:
+  typedef typename GraphTraits::edge_t edge_t;
+  typedef typename GraphTraits::dump_args_t dump_args_t;
+
+  virtual ~dnode () {}
+  virtual void dump_dot (graphviz_out *gv, const dump_args_t &args) const = 0;
+
+  auto_vec<edge_t *> m_preds;
+  auto_vec<edge_t *> m_succs;
+};
+
+/* Abstract base class for an edge in a directed graph.  */
+
+template <typename GraphTraits>
+class dedge
+{
+ public:
+  typedef typename GraphTraits::node_t node_t;
+  typedef typename GraphTraits::dump_args_t dump_args_t;
+
+  dedge (node_t *src, node_t *dest)
+  : m_src (src), m_dest (dest) {}
+
+  virtual ~dedge () {}
+
+  virtual void dump_dot (graphviz_out *gv, const dump_args_t &args) const = 0;
+
+  node_t *const m_src;
+  node_t *const m_dest;
+};
+
+/* Abstract base class for a directed graph.
+   This class maintains the vectors of nodes and edges,
+   and owns the nodes and edges.  */
+
+template <typename GraphTraits>
+class digraph
+{
+ public:
+  typedef typename GraphTraits::node_t node_t;
+  typedef typename GraphTraits::edge_t edge_t;
+  typedef typename GraphTraits::dump_args_t dump_args_t;
+  typedef typename GraphTraits::cluster_t cluster_t;
+
+  digraph () {}
+  virtual ~digraph () {}
+
+  void dump_dot_to_pp (pretty_printer *pp,
+		       cluster_t *root_cluster,
+		       const dump_args_t &args) const;
+  void dump_dot_to_file (FILE *fp,
+			 cluster_t *root_cluster,
+			 const dump_args_t &args) const;
+  void dump_dot (const char *path,
+		 cluster_t *root_cluster,
+		 const dump_args_t &args) const;
+
+  void add_node (node_t *node);
+  void add_edge (edge_t *edge);
+
+  auto_delete_vec<node_t> m_nodes;
+  auto_delete_vec<edge_t> m_edges;
+};
+
+/* Abstract base class for splitting dnodes into hierarchical clusters
+   in the generated .dot file.
+
+   See "Subgraphs and Clusters" within
+     https://www.graphviz.org/doc/info/lang.html
+   and e.g.
+     https://graphviz.gitlab.io/_pages/Gallery/directed/cluster.html
+
+   If a root_cluster is passed to dump_dot*, then all nodes will be
+   added to it at the start of dumping, via calls to add_node.
+
+   The root cluster can organize the nodes into a hierarchy of
+   child clusters.
+
+   After all nodes are added to the root cluster, dump_dot will then
+   be called on it (and not on the nodes themselves).  */
+
+template <typename GraphTraits>
+class cluster
+{
+ public:
+  typedef typename GraphTraits::node_t node_t;
+  typedef typename GraphTraits::dump_args_t dump_args_t;
+
+  virtual ~cluster () {}
+
+  virtual void add_node (node_t *node) = 0;
+
+  /* Recursively dump the cluster, all nodes, and child clusters.  */
+  virtual void dump_dot (graphviz_out *gv, const dump_args_t &) const = 0;
+};
+
+/* Write .dot information for this graph to PP, passing ARGS to the nodes
+   and edges.
+   If ROOT_CLUSTER is non-NULL, use it to organize the nodes into clusters.  */
+
+template <typename GraphTraits>
+inline void
+digraph<GraphTraits>::dump_dot_to_pp (pretty_printer *pp,
+				      cluster_t *root_cluster,
+				      const dump_args_t &args) const
+{
+  graphviz_out gv (pp);
+
+  pp_string (pp, "digraph \"");
+  pp_string (pp, "base");
+  pp_string (pp, "\" {\n");
+
+  gv.indent ();
+
+  pp_string (pp, "overlap=false;\n");
+  pp_string (pp, "compound=true;\n");
+
+  /* If using clustering, emit all nodes via clusters.  */
+  if (root_cluster)
+    {
+      int i;
+      node_t *n;
+      FOR_EACH_VEC_ELT (m_nodes, i, n)
+	root_cluster->add_node (n);
+      root_cluster->dump_dot (&gv, args);
+    }
+  else
+    {
+      /* Otherwise, display all nodes at top level.  */
+      int i;
+      node_t *n;
+      FOR_EACH_VEC_ELT (m_nodes, i, n)
+	n->dump_dot (&gv, args);
+    }
+
+  /* Edges.  */
+  int i;
+  edge_t *e;
+  FOR_EACH_VEC_ELT (m_edges, i, e)
+    e->dump_dot (&gv, args);
+
+  /* Terminate "digraph" */
+  gv.outdent ();
+  pp_string (pp, "}");
+  pp_newline (pp);
+}
+
+/* Write .dot information for this graph to FP, passing ARGS to the nodes
+   and edges.
+   If ROOT_CLUSTER is non-NULL, use it to organize the nodes into clusters.  */
+
+template <typename GraphTraits>
+inline void
+digraph<GraphTraits>::dump_dot_to_file (FILE *fp,
+					cluster_t *root_cluster,
+					const dump_args_t &args) const
+{
+  pretty_printer pp;
+  // TODO:
+  pp_format_decoder (&pp) = default_tree_printer;
+  pp.buffer->stream = fp;
+  dump_dot_to_pp (&pp, root_cluster, args);
+  pp_flush (&pp);
+}
+
+/* Write .dot information for this graph to a file at PATH, passing ARGS
+   to the nodes and edges.
+   If ROOT_CLUSTER is non-NULL, use it to organize the nodes into clusters.  */
+
+template <typename GraphTraits>
+inline void
+digraph<GraphTraits>::dump_dot (const char *path,
+				cluster_t *root_cluster,
+				const dump_args_t &args) const
+{
+  FILE *fp = fopen (path, "w");
+  dump_dot_to_file (fp, root_cluster, args);
+  fclose (fp);
+}
+
+/* Add NODE to this DIGRAPH, taking ownership.  */
+
+template <typename GraphTraits>
+inline void
+digraph<GraphTraits>::add_node (node_t *node)
+{
+  m_nodes.safe_push (node);
+}
+
+/* Add EDGE to this digraph, and to the preds/succs of its endpoints.
+   Take ownership of EDGE.  */
+
+template <typename GraphTraits>
+inline void
+digraph<GraphTraits>::add_edge (edge_t *edge)
+{
+  m_edges.safe_push (edge);
+  edge->m_dest->m_preds.safe_push (edge);
+  edge->m_src->m_succs.safe_push (edge);
+
+}
+
+#endif /* GCC_DIGRAPH_H */