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[PATCH 45/49] analyzer: new files: engine.{cc|h}
- From: David Malcolm <dmalcolm at redhat dot com>
- To: gcc-patches at gcc dot gnu dot org
- Cc: David Malcolm <dmalcolm at redhat dot com>
- Date: Fri, 15 Nov 2019 20:23:32 -0500
- Subject: [PATCH 45/49] analyzer: new files: engine.{cc|h}
- References: <1573867416-55618-1-git-send-email-dmalcolm@redhat.com>
This patch adds the core analysis code, which explores "interesting"
interprocedual paths in the code, updating state machines to check
for API misuses, and issuing diagnostics for such misuses.
gcc/ChangeLog:
* analyzer/engine.cc: New file.
* analyzer/engine.h: New file.
---
gcc/analyzer/engine.cc | 3416 ++++++++++++++++++++++++++++++++++++++++++++++++
gcc/analyzer/engine.h | 26 +
2 files changed, 3442 insertions(+)
create mode 100644 gcc/analyzer/engine.cc
create mode 100644 gcc/analyzer/engine.h
diff --git a/gcc/analyzer/engine.cc b/gcc/analyzer/engine.cc
new file mode 100644
index 0000000..34941d2
--- /dev/null
+++ b/gcc/analyzer/engine.cc
@@ -0,0 +1,3416 @@
+/* The analysis "engine".
+ Copyright (C) 2019 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 "gcc-plugin.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tree.h"
+#include "params.h"
+#include "gcc-rich-location.h"
+#include "analyzer/exploded-graph.h"
+#include "analyzer/analysis-plan.h"
+#include "analyzer/state-purge.h"
+
+/* For an overview, see gcc/doc/analyzer.texi. */
+
+static int readability_comparator (const void *p1, const void *p2);
+
+////////////////////////////////////////////////////////////////////////////
+
+/* class impl_region_model_context : public region_model_context, public log_user. */
+
+impl_region_model_context::
+impl_region_model_context (exploded_graph &eg,
+ const exploded_node *enode_for_diag,
+ const program_state *old_state,
+ program_state *new_state,
+ state_change *change,
+ const gimple *stmt,
+ stmt_finder *stmt_finder)
+: log_user (eg.get_logger ()), m_eg (&eg),
+ m_enode_for_diag (enode_for_diag),
+ m_old_state (old_state),
+ m_new_state (new_state),
+ m_change (change),
+ m_stmt (stmt),
+ m_stmt_finder (stmt_finder),
+ m_ext_state (eg.get_ext_state ())
+{
+}
+
+impl_region_model_context::
+impl_region_model_context (program_state *state,
+ state_change *change,
+ const extrinsic_state &ext_state)
+: log_user (NULL), m_eg (NULL), m_enode_for_diag (NULL),
+ m_old_state (NULL),
+ m_new_state (state),
+ m_change (change),
+ m_stmt (NULL),
+ m_stmt_finder (NULL),
+ m_ext_state (ext_state)
+{
+}
+
+void
+impl_region_model_context::warn (pending_diagnostic *d)
+{
+ LOG_FUNC (get_logger ());
+ if (m_eg)
+ m_eg->get_diagnostic_manager ().add_diagnostic
+ (m_enode_for_diag, m_enode_for_diag->get_supernode (),
+ m_stmt, m_stmt_finder, d);
+}
+
+void
+impl_region_model_context::remap_svalue_ids (const svalue_id_map &map)
+{
+ m_new_state->remap_svalue_ids (map);
+ if (m_change)
+ m_change->remap_svalue_ids (map);
+}
+
+int
+impl_region_model_context::on_svalue_purge (svalue_id first_unused_sid,
+ const svalue_id_map &map)
+{
+ int total = 0;
+ int sm_idx;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (m_new_state->m_checker_states, sm_idx, smap)
+ {
+ const state_machine &sm = m_ext_state.get_sm (sm_idx);
+ total += smap->on_svalue_purge (sm, sm_idx, first_unused_sid,
+ map, this);
+ }
+ if (m_change)
+ total += m_change->on_svalue_purge (first_unused_sid);
+ return total;
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* class setjmp_svalue : public svalue. */
+
+/* Compare the fields of this setjmp_svalue with OTHER, returning true
+ if they are equal.
+ For use by svalue::operator==. */
+
+bool
+setjmp_svalue::compare_fields (const setjmp_svalue &other) const
+{
+ return m_enode == other.m_enode;
+}
+
+/* Implementation of svalue::add_to_hash vfunc for setjmp_svalue. */
+
+void
+setjmp_svalue::add_to_hash (inchash::hash &hstate) const
+{
+ hstate.add_int (m_enode->m_index);
+}
+
+/* Get the index of the stored exploded_node. */
+
+int
+setjmp_svalue::get_index () const
+{
+ return m_enode->m_index;
+}
+
+/* Implementation of svalue::print_details vfunc for setjmp_svalue. */
+
+void
+setjmp_svalue::print_details (const region_model &model ATTRIBUTE_UNUSED,
+ svalue_id this_sid ATTRIBUTE_UNUSED,
+ pretty_printer *pp) const
+{
+ pp_printf (pp, "setjmp: EN: %i", m_enode->m_index);
+}
+
+
+////////////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////////////
+
+/* Concrete implementation of sm_context, wiring it up to the rest of this
+ file. */
+
+class impl_sm_context : public sm_context, public log_user
+{
+public:
+ impl_sm_context (exploded_graph &eg,
+ int sm_idx,
+ const state_machine &sm,
+ const exploded_node *enode_for_diag,
+ const program_state *old_state,
+ program_state *new_state,
+ state_change *change,
+ const sm_state_map *old_smap,
+ sm_state_map *new_smap,
+ stmt_finder *stmt_finder = NULL)
+ : sm_context (sm_idx, sm),
+ log_user (eg.get_logger ()),
+ m_eg (eg), m_enode_for_diag (enode_for_diag),
+ m_old_state (old_state), m_new_state (new_state),
+ m_change (change),
+ m_old_smap (old_smap), m_new_smap (new_smap),
+ m_stmt_finder (stmt_finder)
+ {
+ }
+
+ void on_transition (const supernode *node ATTRIBUTE_UNUSED,
+ const gimple *stmt ATTRIBUTE_UNUSED,
+ tree var,
+ state_machine::state_t from,
+ state_machine::state_t to,
+ tree origin) FINAL OVERRIDE
+ {
+ LOG_FUNC (get_logger ());
+ impl_region_model_context old_ctxt
+ (m_eg, m_enode_for_diag, NULL, NULL/*m_enode->get_state ()*/,
+ m_change, stmt);
+ svalue_id var_old_sid
+ = m_old_state->m_region_model->get_rvalue (var, &old_ctxt);
+
+ impl_region_model_context new_ctxt (m_eg, m_enode_for_diag,
+ m_old_state, m_new_state,
+ m_change, NULL);
+ svalue_id var_new_sid
+ = m_new_state->m_region_model->get_rvalue (var, &new_ctxt);
+ svalue_id origin_new_sid
+ = m_new_state->m_region_model->get_rvalue (origin, &new_ctxt);
+
+ state_machine::state_t current = m_old_smap->get_state (var_old_sid);
+ if (current == from)
+ {
+ if (get_logger ())
+ log ("%s: state transition of %qE: %s -> %s",
+ m_sm.get_name (),
+ var,
+ m_sm.get_state_name (from),
+ m_sm.get_state_name (to));
+ m_new_smap->set_state (m_new_state->m_region_model, var_new_sid,
+ to, origin_new_sid);
+ if (m_change)
+ m_change->add_sm_change (m_sm_idx, var_new_sid, from, to);
+ }
+ }
+
+ void warn_for_state (const supernode *snode, const gimple *stmt,
+ tree var, state_machine::state_t state,
+ pending_diagnostic *d) FINAL OVERRIDE
+ {
+ LOG_FUNC (get_logger ());
+ gcc_assert (d); // take ownership
+
+ impl_region_model_context old_ctxt
+ (m_eg, m_enode_for_diag, m_old_state, m_new_state, m_change, NULL);
+ svalue_id var_old_sid
+ = m_old_state->m_region_model->get_rvalue (var, &old_ctxt);
+ state_machine::state_t current = m_old_smap->get_state (var_old_sid);
+ if (state == current)
+ {
+ m_eg.get_diagnostic_manager ().add_diagnostic
+ (&m_sm, m_enode_for_diag, snode, stmt, m_stmt_finder,
+ var, state, d);
+ }
+ else
+ delete d;
+ }
+
+ /* Hook for picking more readable trees for SSA names of temporaries,
+ so that rather than e.g.
+ "double-free of '<unknown>'"
+ we can print:
+ "double-free of 'inbuf.data'". */
+
+ tree get_readable_tree (tree expr) FINAL OVERRIDE
+ {
+ /* Only for SSA_NAMEs of temporaries; otherwise, return EXPR, as it's
+ likely to be the least surprising tree to report. */
+ if (TREE_CODE (expr) != SSA_NAME)
+ return expr;
+ if (SSA_NAME_VAR (expr) != NULL)
+ return expr;
+
+ gcc_assert (m_new_state);
+ svalue_id sid = m_new_state->m_region_model->get_rvalue (expr, NULL);
+ /* Find trees for all regions storing the value. */
+ auto_vec<path_var> pvs;
+ m_new_state->m_region_model->get_path_vars_for_svalue (sid, &pvs);
+ if (pvs.length () < 1)
+ return expr;
+ /* Pick the "best" such tree. */
+ // TODO: should we also consider (and consolidate) equiv classes?
+ pvs.qsort (readability_comparator);
+ return pvs[0].m_tree;
+ }
+
+ exploded_graph &m_eg;
+ const exploded_node *m_enode_for_diag;
+ const program_state *m_old_state;
+ program_state *m_new_state;
+ state_change *m_change;
+ const sm_state_map *m_old_smap;
+ sm_state_map *m_new_smap;
+ stmt_finder *m_stmt_finder;
+};
+
+////////////////////////////////////////////////////////////////////////////
+
+/* Subclass of stmt_finder for finding the best stmt to report the leak at,
+ given the emission path. */
+
+class leak_stmt_finder : public stmt_finder
+{
+public:
+ leak_stmt_finder (const exploded_graph &eg, tree var)
+ : m_eg (eg), m_var (var) {}
+
+ stmt_finder *clone () const FINAL OVERRIDE
+ {
+ return new leak_stmt_finder (m_eg, m_var);
+ }
+
+ const gimple *find_stmt (const exploded_path &epath)
+ FINAL OVERRIDE
+ {
+ LOG_FUNC (m_eg.get_logger ());
+
+ if (TREE_CODE (m_var) == SSA_NAME)
+ {
+ /* Locate the final write to this SSA name in the path. */
+ const gimple *def_stmt = SSA_NAME_DEF_STMT (m_var);
+
+ int idx_of_def_stmt;
+ bool found = epath.find_stmt_backwards (def_stmt, &idx_of_def_stmt);
+ if (!found)
+ goto not_found;
+
+ /* What was the next write to the underlying var
+ after the SSA name was set? (if any). */
+
+ for (unsigned idx = idx_of_def_stmt + 1;
+ idx < epath.m_edges.length ();
+ ++idx)
+ {
+ const exploded_edge *eedge = epath.m_edges[idx];
+ if (m_eg.get_logger ())
+ m_eg.log ("eedge[%i]: EN %i -> EN %i",
+ idx,
+ eedge->m_src->m_index,
+ eedge->m_dest->m_index);
+ const exploded_node *dst_node = eedge->m_dest;
+ const program_point &dst_point = dst_node->get_point ();
+ const gimple *stmt = dst_point.get_stmt ();
+ if (!stmt)
+ continue;
+ if (const gassign *assign = dyn_cast <const gassign *> (stmt))
+ {
+ tree lhs = gimple_assign_lhs (assign);
+ if (TREE_CODE (lhs) == SSA_NAME
+ && SSA_NAME_VAR (lhs) == SSA_NAME_VAR (m_var))
+ return assign;
+ }
+ }
+ }
+
+ not_found:
+
+ /* Look backwards for the first statement with a location. */
+ int i;
+ const exploded_edge *eedge;
+ FOR_EACH_VEC_ELT_REVERSE (epath.m_edges, i, eedge)
+ {
+ if (m_eg.get_logger ())
+ m_eg.log ("eedge[%i]: EN %i -> EN %i",
+ i,
+ eedge->m_src->m_index,
+ eedge->m_dest->m_index);
+ const exploded_node *dst_node = eedge->m_dest;
+ const program_point &dst_point = dst_node->get_point ();
+ const gimple *stmt = dst_point.get_stmt ();
+ if (stmt)
+ if (stmt->location != UNKNOWN_LOCATION)
+ return stmt;
+ }
+
+ gcc_unreachable ();
+ return NULL;
+ }
+
+private:
+ const exploded_graph &m_eg;
+ tree m_var;
+};
+
+////////////////////////////////////////////////////////////////////////////
+
+/* A measurement of how good EXPR is for presenting to the user, so
+ that e.g. we can say prefer printing
+ "leak of 'tmp.m_ptr'"
+ over:
+ "leak of '<unknown>'". */
+
+static int
+readability (const_tree expr)
+{
+ gcc_assert (expr);
+ switch (TREE_CODE (expr))
+ {
+ case COMPONENT_REF:
+ case MEM_REF:
+ /* Impose a slight readability penalty relative to that of
+ operand 0. */
+ return readability (TREE_OPERAND (expr, 0)) - 1;
+
+ case SSA_NAME:
+ {
+ if (tree var = SSA_NAME_VAR (expr))
+ return readability (var);
+ /* Avoid printing '<unknown>' for SSA names for temporaries. */
+ return -1;
+ }
+ break;
+
+ case VAR_DECL:
+ /* Arbitrarily-chosen "high readability" value. */
+ return 256;
+
+ default:
+ return 0;
+ }
+
+ return 0;
+}
+
+/* A qsort comparator for trees to sort them into most user-readable to
+ least user-readable. */
+
+static int
+readability_comparator (const void *p1, const void *p2)
+{
+ path_var pv1 = *(path_var const *)p1;
+ path_var pv2 = *(path_var const *)p2;
+
+ /* TODO: should we consider stack depths? */
+ int r1 = readability (pv1.m_tree);
+ int r2 = readability (pv2.m_tree);
+
+ return r2 - r1;
+}
+
+/* Create an sm_context and use it to call SM's on_leak vfunc, so that
+ it can potentially complain about a leak of DST_SID (in a new region_model)
+ in the given STATE, where MAP can be used to map SID back to an "old"
+ region_model. */
+
+void
+impl_region_model_context::on_state_leak (const state_machine &sm,
+ int sm_idx,
+ svalue_id dst_sid,
+ svalue_id first_unused_sid,
+ const svalue_id_map &map,
+ state_machine::state_t state)
+{
+ LOG_SCOPE (get_logger ());
+ if (get_logger ())
+ log ("considering leak of sv%i", dst_sid.as_int ());
+
+ if (!m_eg)
+ return;
+
+ /* m_old_state also needs to be non-NULL so that the sm_ctxt can look
+ up the old state of the sid. */
+ gcc_assert (m_old_state);
+
+ /* Don't report on sid leaking if it's equal to one of the used sids.
+ For example, given:
+ some_non_trivial_expression = malloc (sizeof (struct foo));
+ we have:
+ _1 = malloc; (void *)
+ some_non_trivial_expression = _1; (struct foo *)
+ and at leak-detection time we may have:
+ sv5: {type: 'struct foo *', &r3} (used)
+ sv6: {type: 'void *', &r3} (unused)
+ where both point to the same region. We don't want to report a
+ leak of sv6, so we reject the report due to its equality with sv5. */
+ gcc_assert (m_new_state);
+ gcc_assert (!first_unused_sid.null_p ());
+ for (int i = 0; i < first_unused_sid.as_int (); i++)
+ {
+ svalue_id used_sid = svalue_id::from_int (i);
+
+ /* Use the "_without_cm" form of eval_condition, since
+ we're half-way through purging - we don't want to introduce new
+ equivalence classes into the constraint_manager for "sid" and
+ for each of the used_sids. */
+ const region_model &rm = *m_new_state->m_region_model;
+ tristate eq = rm.eval_condition_without_cm (dst_sid, EQ_EXPR, used_sid);
+ if (eq.is_true ())
+ {
+ log ("rejecting leak of sv%i due to equality with sv%i",
+ dst_sid.as_int (), used_sid.as_int ());
+ return;
+ }
+ }
+
+ /* SID has leaked within the new state: no regions use it.
+ We need to convert it back to a tree, but since no regions use it, we
+ have to use MAP to convert it back to an svalue_id within the old state.
+ We can then look that svalue_id up to locate regions and thus tree(s)
+ that use it. */
+
+ svalue_id old_sid = map.get_src_for_dst (dst_sid);
+
+ auto_vec<path_var> leaked_pvs;
+ m_old_state->m_region_model->get_path_vars_for_svalue (old_sid, &leaked_pvs);
+
+ if (leaked_pvs.length () < 1)
+ return;
+
+ /* Find "best" leaked tree.
+ Sort the leaks into most human-readable first, through
+ to least user-readable. Given that we only emit one
+ leak per EC, this ought to ensure that we pick the most
+ user-readable description of each leaking EC.
+ This assumes that all vars in the EC have the same state. */
+ leaked_pvs.qsort (readability_comparator);
+
+ tree leaked_tree = leaked_pvs[0].m_tree;
+ if (get_logger ())
+ log ("best leaked_tree: %qE", leaked_tree);
+
+ leak_stmt_finder stmt_finder (*m_eg, leaked_tree);
+ impl_sm_context sm_ctxt (*m_eg, sm_idx, sm, m_enode_for_diag,
+ m_old_state, m_new_state,
+ m_change,
+ m_old_state->m_checker_states[sm_idx],
+ m_new_state->m_checker_states[sm_idx],
+ &stmt_finder);
+ gcc_assert (m_enode_for_diag);
+
+ /* Don't complain about leaks when returning from "main". */
+ if (m_enode_for_diag->get_supernode ()
+ && m_enode_for_diag->get_supernode ()->return_p ())
+ {
+ tree fndecl = m_enode_for_diag->get_function ()->decl;
+ if (0 == strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
+ {
+ log ("not reporting leak from main");
+ return;
+ }
+ }
+
+ sm.on_leak (&sm_ctxt, m_enode_for_diag->get_supernode (), m_stmt,
+ leaked_tree, state);
+}
+
+/* Implementation of region_model_context::on_inherited_svalue vfunc
+ for impl_region_model_context.
+ Notify all checkers that CHILD_SID has been created from PARENT_SID,
+ so that those state machines that inherit state can propagate the state
+ from parent to child. */
+
+void
+impl_region_model_context::on_inherited_svalue (svalue_id parent_sid,
+ svalue_id child_sid)
+{
+ if (!m_new_state)
+ return;
+
+ int sm_idx;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (m_new_state->m_checker_states, sm_idx, smap)
+ {
+ const state_machine &sm = m_ext_state.get_sm (sm_idx);
+ if (sm.inherited_state_p ())
+ smap->on_inherited_svalue (parent_sid, child_sid);
+ }
+}
+
+/* Implementation of region_model_context::on_cast vfunc
+ for impl_region_model_context.
+ Notify all checkers that DST_SID is a cast of SRC_SID, so that sm-state
+ can be propagated from src to dst. */
+
+void
+impl_region_model_context::on_cast (svalue_id src_sid,
+ svalue_id dst_sid)
+{
+ if (!m_new_state)
+ return;
+
+ int sm_idx;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (m_new_state->m_checker_states, sm_idx, smap)
+ smap->on_cast (src_sid, dst_sid);
+}
+
+/* Implementation of region_model_context::on_condition vfunc.
+ Notify all state machines about the condition, which could lead to
+ state transitions. */
+
+void
+impl_region_model_context::on_condition (tree lhs, enum tree_code op, tree rhs)
+{
+ int sm_idx;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (m_new_state->m_checker_states, sm_idx, smap)
+ {
+ const state_machine &sm = m_ext_state.get_sm (sm_idx);
+ impl_sm_context sm_ctxt (*m_eg, sm_idx, sm, m_enode_for_diag,
+ m_old_state, m_new_state,
+ m_change,
+ m_old_state->m_checker_states[sm_idx],
+ m_new_state->m_checker_states[sm_idx]);
+ sm.on_condition (&sm_ctxt,
+ m_enode_for_diag->get_supernode (), m_stmt,
+ lhs, op, rhs);
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* Subroutine of print_enode_indices: print a run of indices from START_IDX
+ to END_IDX to PP, using and updating *FIRST_RUN. */
+
+static void
+print_run (pretty_printer *pp, int start_idx, int end_idx,
+ bool *first_run)
+{
+ if (!(*first_run))
+ pp_string (pp, ", ");
+ *first_run = false;
+ if (start_idx == end_idx)
+ pp_printf (pp, "EN: %i", start_idx);
+ else
+ pp_printf (pp, "EN: %i-%i", start_idx, end_idx);
+}
+
+/* Print the indices within ENODES to PP, collecting them as
+ runs/singletons e.g. "EN: 4-7, EN: 20-23, EN: 42". */
+
+static void
+print_enode_indices (pretty_printer *pp,
+ const auto_vec<exploded_node *> &enodes)
+{
+ int cur_start_idx = -1;
+ int cur_finish_idx = -1;
+ bool first_run = true;
+ unsigned i;
+ exploded_node *enode;
+ FOR_EACH_VEC_ELT (enodes, i, enode)
+ {
+ if (cur_start_idx == -1)
+ {
+ gcc_assert (cur_finish_idx == -1);
+ cur_start_idx = cur_finish_idx = enode->m_index;
+ }
+ else
+ {
+ if (enode->m_index == cur_finish_idx + 1)
+ /* Continuation of a run. */
+ cur_finish_idx = enode->m_index;
+ else
+ {
+ /* Finish existing run, start a new one. */
+ gcc_assert (cur_start_idx >= 0);
+ gcc_assert (cur_finish_idx >= 0);
+ print_run (pp, cur_start_idx, cur_finish_idx,
+ &first_run);
+ cur_start_idx = cur_finish_idx = enode->m_index;
+ }
+ }
+ }
+ /* Finish any existing run. */
+ if (cur_start_idx >= 0)
+ {
+ gcc_assert (cur_finish_idx >= 0);
+ print_run (pp, cur_start_idx, cur_finish_idx,
+ &first_run);
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* For use by dump_dot, get a value for the .dot "fillcolor" attribute.
+ Colorize by sm-state, to make it easier to see how sm-state propagates
+ through the exploded_graph. */
+
+const char *
+exploded_node::get_dot_fillcolor () const
+{
+ const program_state &state = get_state ();
+
+ /* We want to be able to easily distinguish the no-sm-state case,
+ and to be able to distinguish cases where there's a single state
+ from each other.
+
+ Sum the sm_states, and use the result to choose from a table,
+ modulo table-size, special-casing the "no sm-state" case. */
+ int total_sm_state = 0;
+ int i;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (state.m_checker_states, i, smap)
+ for (sm_state_map::iterator_t iter = smap->begin ();
+ iter != smap->end ();
+ ++iter)
+ total_sm_state += (*iter).second.m_state;
+
+ if (total_sm_state > 0)
+ {
+ /* An arbitrarily-picked collection of light colors. */
+ const char * const colors[]
+ = {"azure", "coral", "cornsilk", "lightblue", "yellow"};
+ const int num_colors = sizeof (colors) / sizeof (colors[0]);
+ return colors[total_sm_state % num_colors];
+ }
+ else
+ /* No sm-state. */
+ return "lightgrey";
+}
+
+/* Implementation of dnode::dump_dot vfunc for exploded_node. */
+
+void
+exploded_node::dump_dot (graphviz_out *gv, const dump_args_t &args) const
+{
+ pretty_printer *pp = gv->get_pp ();
+
+ dump_dot_id (pp);
+ pp_printf (pp, " [shape=%s,style=filled,fillcolor=%s,label=\"",
+ "record",
+ get_dot_fillcolor ());
+ pp_left_brace (pp);
+ pp_write_text_to_stream (pp);
+
+ pp_printf (pp, "EN: %i", m_index);
+ pp_newline (pp);
+
+ format f (true);
+ m_ps.m_point.print (pp, f);
+ pp_newline (pp);
+
+ const extrinsic_state &ext_state = args.m_eg.get_ext_state ();
+ m_ps.m_state.dump_to_pp (ext_state, true, pp);
+ pp_newline (pp);
+
+ {
+ int i;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (m_ps.m_state.m_checker_states, i, smap)
+ {
+ if (!smap->is_empty_p ())
+ {
+ pp_printf (pp, "%s: ", ext_state.get_name (i));
+ smap->print (ext_state.get_sm (i), pp);
+ pp_newline (pp);
+ }
+ }
+ }
+
+ pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/true);
+
+ pp_right_brace (pp);
+ pp_string (pp, "\"];\n\n");
+ pp_flush (pp);
+}
+
+/* Dump this to PP in a form suitable for use as an id in .dot output. */
+
+void
+exploded_node::dump_dot_id (pretty_printer *pp) const
+{
+ pp_printf (pp, "exploded_node_%i", m_index);
+}
+
+/* Dump a multiline representation of this node to PP. */
+
+void
+exploded_node::dump_to_pp (pretty_printer *pp,
+ const extrinsic_state &ext_state) const
+{
+ pp_printf (pp, "EN: %i", m_index);
+ pp_newline (pp);
+
+ format f (true);
+ m_ps.m_point.print (pp, f);
+ pp_newline (pp);
+
+ m_ps.m_state.dump_to_pp (ext_state, false, pp);
+ pp_newline (pp);
+}
+
+/* Dump a multiline representation of this node to FILE. */
+
+void
+exploded_node::dump (FILE *fp,
+ const extrinsic_state &ext_state) const
+{
+ pretty_printer pp;
+ pp_format_decoder (&pp) = default_tree_printer;
+ pp_show_color (&pp) = pp_show_color (global_dc->printer);
+ pp.buffer->stream = fp;
+ dump_to_pp (&pp, ext_state);
+ pp_flush (&pp);
+}
+
+/* Dump a multiline representation of this node to stderr. */
+
+DEBUG_FUNCTION void
+exploded_node::dump (const extrinsic_state &ext_state) const
+{
+ dump (stderr, ext_state);
+}
+
+/* Return true if FNDECL has a gimple body. */
+// TODO: is there a pre-canned way to do this?
+
+static bool
+fndecl_has_gimple_body_p (tree fndecl)
+{
+ if (fndecl == NULL_TREE)
+ return false;
+
+ cgraph_node *n = cgraph_node::get (fndecl);
+ if (!n)
+ return false;
+
+ return n->has_gimple_body_p ();
+}
+
+/* A pending_diagnostic subclass for implementing "__analyzer_dump_path". */
+
+class dump_path_diagnostic
+ : public pending_diagnostic_subclass<dump_path_diagnostic>
+{
+public:
+ bool emit (rich_location *richloc) FINAL OVERRIDE
+ {
+ inform (richloc, "path");
+ return true;
+ }
+
+ const char *get_kind () const FINAL OVERRIDE { return "dump_path_diagnostic"; }
+
+ bool operator== (const dump_path_diagnostic &) const
+ {
+ return true;
+ }
+};
+
+/* Modify STATE in place, applying the effects of the stmt at this node's
+ point.
+ Return true if there were any sm-state changes. */
+
+bool
+exploded_node::on_stmt (exploded_graph &eg,
+ const supernode *snode,
+ const gimple *stmt,
+ program_state *state,
+ state_change *change) const
+{
+ /* Preserve the old state. It is used here for looking
+ up old checker states, for determining state transitions, and
+ also within impl_region_model_context and impl_sm_context for
+ going from tree to svalue_id. */
+ const program_state old_state (*state);
+
+ impl_region_model_context ctxt (eg, this,
+ &old_state, state, change,
+ stmt);
+
+ if (const gassign *assign = dyn_cast <const gassign *> (stmt))
+ state->m_region_model->on_assignment (assign, &ctxt);
+
+ if (const greturn *return_ = dyn_cast <const greturn *> (stmt))
+ state->m_region_model->on_return (return_, &ctxt);
+
+ if (const gcall *call = dyn_cast <const gcall *> (stmt))
+ {
+ /* Debugging/test support. */
+ if (is_named_call_p (call, "__analyzer_dump", 0))
+ {
+ /* Handle the builtin "__analyzer_dump" by dumping state
+ to stderr. */
+ dump (eg.get_ext_state ());
+ }
+ else if (is_named_call_p (call, "__analyzer_dump_path", 0))
+ {
+ /* Handle the builtin "__analyzer_dump_path" by queuing a
+ diagnostic at this exploded_node. */
+ ctxt.warn (new dump_path_diagnostic ());
+ }
+ else if (is_named_call_p (call, "__analyzer_dump_region_model", 0))
+ {
+ /* Handle the builtin "__analyzer_dump_region_model" by dumping
+ the region model's state to stderr. */
+ state->m_region_model->dump (false);
+ }
+ else if (is_named_call_p (call, "__analyzer_eval", 1))
+ {
+ /* Handle the builtin "__analyzer_eval" by evaluating the input
+ and dumping as a dummy warning, so that test cases can use
+ dg-warning to validate the result (and so unexpected warnings will
+ lead to DejaGnu failures). */
+ tree t_arg = gimple_call_arg (call, 0);
+ tristate t
+ = state->m_region_model->eval_condition (t_arg,
+ NE_EXPR,
+ integer_zero_node,
+ &ctxt);
+ warning_at (call->location, 0, "%s", t.as_string ());
+ }
+ else if (is_named_call_p (call, "__analyzer_break", 0))
+ {
+ /* Handle the builtin "__analyzer_break" by triggering a
+ breakpoint. */
+ /* TODO: is there a good cross-platform way to do this? */
+ raise (SIGINT);
+ }
+ else if (is_setjmp_call_p (stmt))
+ state->m_region_model->on_setjmp (call, this, &ctxt);
+ else if (is_longjmp_call_p (call))
+ {
+ on_longjmp (eg, call, state, &ctxt);
+ return true;
+ }
+ else
+ state->m_region_model->on_call_pre (call, &ctxt);
+ }
+
+ bool any_sm_changes = false;
+ int sm_idx;
+ sm_state_map *smap;
+ FOR_EACH_VEC_ELT (old_state.m_checker_states, sm_idx, smap)
+ {
+ const state_machine &sm = eg.get_ext_state ().get_sm (sm_idx);
+ const sm_state_map *old_smap
+ = old_state.m_checker_states[sm_idx];
+ sm_state_map *new_smap = state->m_checker_states[sm_idx];
+ impl_sm_context ctxt (eg, sm_idx, sm, this, &old_state, state,
+ change,
+ old_smap, new_smap);
+ /* Allow the state_machine to handle the stmt. */
+ if (!sm.on_stmt (&ctxt, snode, stmt))
+ {
+ /* For those stmts that were not handled by the state machine. */
+ if (const gcall *call = dyn_cast <const gcall *> (stmt))
+ {
+ tree callee_fndecl = gimple_call_fndecl (call);
+ // TODO: maybe we can be smarter about handling function pointers?
+
+ if (!fndecl_has_gimple_body_p (callee_fndecl))
+ new_smap->purge_for_unknown_fncall (eg, sm, call, callee_fndecl,
+ state->m_region_model);
+ }
+ }
+ if (*old_smap != *new_smap)
+ any_sm_changes = true;
+ }
+
+ if (const gcall *call = dyn_cast <const gcall *> (stmt))
+ state->m_region_model->on_call_post (call, &ctxt);
+
+ return any_sm_changes;
+}
+
+/* Consider the effect of following superedge SUCC from this node.
+
+ Return true if it's feasible to follow the edge, or false
+ if it's infeasible.
+
+ Examples: if it's the "true" branch within
+ a CFG and we know the conditional is false, we know it's infeasible.
+ If it's one of multiple interprocedual "return" edges, then only
+ the edge back to the most recent callsite is feasible.
+
+ Update NEXT_STATE accordingly (e.g. to record that a condition was
+ true or false, or that the NULL-ness of a pointer has been checked,
+ pushing/popping stack frames, etc).
+
+ Update NEXT_POINT accordingly (updating the call string). */
+
+bool
+exploded_node::on_edge (exploded_graph &eg,
+ const superedge *succ,
+ program_point *next_point,
+ program_state *next_state,
+ state_change *change) const
+{
+ LOG_FUNC (eg.get_logger ());
+
+ if (!next_point->on_edge (eg, succ))
+ return false;
+
+ if (!next_state->on_edge (eg, *this, succ, change))
+ return false;
+
+ return true;
+}
+
+/* Verify that the stack at LONGJMP_POINT is still valid, given a call
+ to "setjmp" at SETJMP_POINT - the stack frame that "setjmp" was
+ called in must still be valid.
+
+ Caveat: this merely checks the call_strings in the points; it doesn't
+ detect the case where a frame returns and is then called again. */
+
+static bool
+valid_longjmp_stack_p (const program_point &longjmp_point,
+ const program_point &setjmp_point)
+{
+ const call_string &cs_at_longjmp = longjmp_point.get_call_string ();
+ const call_string &cs_at_setjmp = setjmp_point.get_call_string ();
+
+ if (cs_at_longjmp.length () < cs_at_setjmp.length ())
+ return false;
+
+ /* Check that the call strings match, up to the depth of the
+ setjmp point. */
+ for (unsigned depth = 0; depth < cs_at_setjmp.length (); depth++)
+ if (cs_at_longjmp[depth] != cs_at_setjmp[depth])
+ return false;
+
+ return true;
+}
+
+/* A pending_diagnostic subclass for complaining about bad longjmps,
+ where the enclosing function of the "setjmp" has returned (and thus
+ the stack frame no longer exists). */
+
+class stale_jmp_buf : public pending_diagnostic_subclass<dump_path_diagnostic>
+{
+public:
+ stale_jmp_buf (const gcall *setjmp_call, const gcall *longjmp_call)
+ : m_setjmp_call (setjmp_call), m_longjmp_call (longjmp_call)
+ {}
+
+ bool emit (rich_location *richloc) FINAL OVERRIDE
+ {
+ return warning_at
+ (richloc, OPT_Wanalyzer_stale_setjmp_buffer,
+ "%qs called after enclosing function of %qs has returned",
+ "longjmp", "setjmp");
+ }
+
+ const char *get_kind () const FINAL OVERRIDE
+ { return "stale_jmp_buf"; }
+
+ bool operator== (const stale_jmp_buf &other) const
+ {
+ return (m_setjmp_call == other.m_setjmp_call
+ && m_longjmp_call == other.m_longjmp_call);
+ }
+
+private:
+ const gcall *m_setjmp_call;
+ const gcall *m_longjmp_call;
+};
+
+/* Handle LONGJMP_CALL, a call to "longjmp".
+
+ Attempt to locate where "setjmp" was called on the jmp_buf and build an
+ exploded_node and exploded_edge to it representing a rewind to that frame,
+ handling the various kinds of failure that can occur. */
+
+void
+exploded_node::on_longjmp (exploded_graph &eg,
+ const gcall *longjmp_call,
+ program_state *new_state,
+ region_model_context *ctxt) const
+{
+ tree buf_ptr = gimple_call_arg (longjmp_call, 0);
+
+ region_model *new_region_model = new_state->m_region_model;
+ region_id buf_rid = new_region_model->deref_rvalue (buf_ptr, ctxt);
+ region *buf = new_region_model->get_region (buf_rid);
+ if (!buf)
+ return;
+
+ svalue_id buf_content_sid
+ = buf->get_value (*new_region_model, false, ctxt);
+ svalue *buf_content_sval = new_region_model->get_svalue (buf_content_sid);
+ if (!buf_content_sval)
+ return;
+ setjmp_svalue *setjmp_sval = buf_content_sval->dyn_cast_setjmp_svalue ();
+ if (!setjmp_sval)
+ return;
+
+ /* Build a custom enode and eedge for rewinding from the longjmp
+ call back to the setjmp. */
+
+ const exploded_node *enode_origin = setjmp_sval->get_exploded_node ();
+ rewind_info_t rewind_info (enode_origin);
+
+ const gcall *setjmp_call = rewind_info.get_setjmp_call ();
+ const program_point &setjmp_point = rewind_info.get_setjmp_point ();
+
+ const program_point &longjmp_point = get_point ();
+
+ /* Verify that the setjmp's call_stack hasn't been popped. */
+ if (!valid_longjmp_stack_p (longjmp_point, setjmp_point))
+ {
+ ctxt->warn (new stale_jmp_buf (setjmp_call, longjmp_call));
+ return;
+ }
+
+ gcc_assert (longjmp_point.get_stack_depth ()
+ >= setjmp_point.get_stack_depth ());
+
+ /* Update the state for use by the destination node. */
+ new_region_model->on_longjmp (longjmp_call, setjmp_call,
+ setjmp_point.get_stack_depth (), ctxt);
+
+ program_point next_point
+ = program_point::after_supernode (setjmp_point.get_supernode (),
+ setjmp_point.get_call_string ());
+
+ state_change change;
+ exploded_node *next = eg.get_or_create_node (next_point, *new_state, &change);
+
+ /* Create custom exploded_edge for a longjmp. */
+ if (next)
+ eg.add_edge (const_cast<exploded_node *> (this), next, NULL,
+ change,
+ new rewind_info_t (enode_origin));
+}
+
+/* Subroutine of exploded_graph::process_node for finding the successors
+ of the supernode for a function exit basic block.
+
+ Ensure that pop_frame is called, potentially queuing diagnostics about
+ leaks. */
+
+void
+exploded_node::detect_leaks (exploded_graph &eg) const
+{
+ LOG_FUNC_1 (eg.get_logger (), "EN: %i", m_index);
+
+ gcc_assert (get_point ().get_supernode ()->return_p ());
+
+ /* If we're not a "top-level" function, do nothing; pop_frame
+ will be called when handling the return superedge. */
+ if (get_point ().get_stack_depth () > 1)
+ return;
+
+ /* We have a "top-level" function. */
+ gcc_assert (get_point ().get_stack_depth () == 1);
+
+ const program_state &old_state = get_state ();
+
+ /* Work with a temporary copy of the state: pop the frame, and see
+ what leaks (via purge_unused_svalues). */
+ program_state new_state (old_state);
+
+ gcc_assert (new_state.m_region_model);
+
+ purge_stats stats;
+ impl_region_model_context ctxt (eg, this,
+ &old_state, &new_state,
+ NULL,
+ get_stmt ());
+ new_state.m_region_model->pop_frame (true, &stats, &ctxt);
+}
+
+/* Dump the successors and predecessors of this enode to OUTF. */
+
+void
+exploded_node::dump_succs_and_preds (FILE *outf) const
+{
+ unsigned i;
+ exploded_edge *e;
+ {
+ auto_vec<exploded_node *> preds (m_preds.length ());
+ FOR_EACH_VEC_ELT (m_preds, i, e)
+ preds.quick_push (e->m_src);
+ pretty_printer pp;
+ print_enode_indices (&pp, preds);
+ fprintf (outf, "preds: %s\n",
+ pp_formatted_text (&pp));
+ }
+ {
+ auto_vec<exploded_node *> succs (m_succs.length ());
+ FOR_EACH_VEC_ELT (m_succs, i, e)
+ succs.quick_push (e->m_dest);
+ pretty_printer pp;
+ print_enode_indices (&pp, succs);
+ fprintf (outf, "succs: %s\n",
+ pp_formatted_text (&pp));
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* class exploded_edge : public dedge. */
+
+/* exploded_edge's ctor. */
+
+exploded_edge::exploded_edge (exploded_node *src, exploded_node *dest,
+ const superedge *sedge,
+ const state_change &change,
+ rewind_info_t *rewind_info)
+: dedge (src, dest), m_sedge (sedge), m_change (change),
+ m_rewind_info (rewind_info)
+{
+ change.validate (dest->get_state ());
+}
+
+/* exploded_edge's dtor. */
+
+exploded_edge::~exploded_edge ()
+{
+ delete m_rewind_info;
+}
+
+/* Implementation of dedge::dump_dot vfunc for exploded_edge.
+ Use the label of the underlying superedge, if any. */
+
+void
+exploded_edge::dump_dot (graphviz_out *gv, const dump_args_t &args) const
+{
+ pretty_printer *pp = gv->get_pp ();
+
+ const char *style = "\"solid,bold\"";
+ const char *color = "black";
+ int weight = 10;
+ const char *constraint = "true";
+
+ if (m_sedge)
+ switch (m_sedge->m_kind)
+ {
+ default:
+ gcc_unreachable ();
+ case SUPEREDGE_CFG_EDGE:
+ break;
+ case SUPEREDGE_CALL:
+ color = "red";
+ //constraint = "false";
+ break;
+ case SUPEREDGE_RETURN:
+ color = "green";
+ //constraint = "false";
+ break;
+ case SUPEREDGE_INTRAPROCEDURAL_CALL:
+ style = "\"dotted\"";
+ break;
+ }
+ if (m_rewind_info)
+ {
+ color = "red";
+ style = "\"dotted\"";
+ }
+
+ m_src->dump_dot_id (pp);
+ pp_string (pp, " -> ");
+ m_dest->dump_dot_id (pp);
+ pp_printf (pp,
+ (" [style=%s, color=%s, weight=%d, constraint=%s,"
+ " headlabel=\""),
+ style, color, weight, constraint);
+
+ if (m_sedge)
+ m_sedge->dump_label_to_pp (pp, false);
+ else if (m_rewind_info)
+ pp_string (pp, "rewind");
+
+ m_change.dump (pp, args.m_eg.get_ext_state ());
+ //pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/false);
+
+ pp_printf (pp, "\"];\n");
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* struct stats. */
+
+/* stats' ctor. */
+
+stats::stats (int num_supernodes)
+: m_node_reuse_count (0),
+ m_node_reuse_after_merge_count (0),
+ m_num_supernodes (num_supernodes)
+{
+ for (int i = 0; i < NUM_POINT_KINDS; i++)
+ m_num_nodes[i] = 0;
+}
+
+/* Log these stats in multiline form to LOGGER. */
+
+void
+stats::log (logger *logger) const
+{
+ gcc_assert (logger);
+ for (int i = 0; i < NUM_POINT_KINDS; i++)
+ logger->log ("m_num_nodes[%s]: %i",
+ point_kind_to_string (static_cast <enum point_kind> (i)),
+ m_num_nodes[i]);
+ logger->log ("m_node_reuse_count: %i", m_node_reuse_count);
+ logger->log ("m_node_reuse_after_merge_count: %i",
+ m_node_reuse_after_merge_count);
+}
+
+/* Dump these stats in multiline form to OUT. */
+
+void
+stats::dump (FILE *out) const
+{
+ for (int i = 0; i < NUM_POINT_KINDS; i++)
+ fprintf (out, "m_num_nodes[%s]: %i\n",
+ point_kind_to_string (static_cast <enum point_kind> (i)),
+ m_num_nodes[i]);
+ fprintf (out, "m_node_reuse_count: %i\n", m_node_reuse_count);
+ fprintf (out, "m_node_reuse_after_merge_count: %i\n",
+ m_node_reuse_after_merge_count);
+
+ if (m_num_supernodes > 0)
+ fprintf (out, "PK_AFTER_SUPERNODE nodes per supernode: %.2f\n",
+ (float)m_num_nodes[PK_AFTER_SUPERNODE] / (float)m_num_supernodes);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* strongly_connected_components's ctor. Tarjan's SCC algorithm. */
+
+strongly_connected_components::
+strongly_connected_components (const supergraph &sg, logger *logger)
+: m_sg (sg), m_per_node (m_sg.num_nodes ())
+{
+ LOG_SCOPE (logger);
+ auto_client_timevar tv ("computing scc");
+
+ for (int i = 0; i < m_sg.num_nodes (); i++)
+ m_per_node.quick_push (per_node_data ());
+
+ for (int i = 0; i < m_sg.num_nodes (); i++)
+ if (m_per_node[i].m_index == -1)
+ strong_connect (i);
+
+ if (0)
+ dump ();
+}
+
+/* Dump this object to stderr. */
+
+DEBUG_FUNCTION void
+strongly_connected_components::dump () const
+{
+ for (int i = 0; i < m_sg.num_nodes (); i++)
+ {
+ const per_node_data &v = m_per_node[i];
+ fprintf (stderr, "SN %i: index: %i lowlink: %i on_stack: %i\n",
+ i, v.m_index, v.m_lowlink, v.m_on_stack);
+ }
+}
+
+/* Subroutine of strongly_connected_components's ctor, part of Tarjan's
+ SCC algorithm. */
+
+void
+strongly_connected_components::strong_connect (unsigned index)
+{
+ supernode *v_snode = m_sg.get_node_by_index (index);
+
+ /* Set the depth index for v to the smallest unused index. */
+ per_node_data *v = &m_per_node[index];
+ v->m_index = index;
+ v->m_lowlink = index;
+ m_stack.safe_push (index);
+ v->m_on_stack = true;
+ index++;
+
+ /* Consider successors of v. */
+ unsigned i;
+ superedge *sedge;
+ FOR_EACH_VEC_ELT (v_snode->m_succs, i, sedge)
+ {
+ supernode *w_snode = sedge->m_dest;
+ per_node_data *w = &m_per_node[w_snode->m_index];
+ if (w->m_index == -1)
+ {
+ /* Successor w has not yet been visited; recurse on it. */
+ strong_connect (w_snode->m_index);
+ v->m_lowlink = MIN (v->m_lowlink, w->m_lowlink);
+ }
+ else if (w->m_on_stack)
+ {
+ /* Successor w is in stack S and hence in the current SCC
+ If w is not on stack, then (v, w) is a cross-edge in the DFS
+ tree and must be ignored. */
+ v->m_lowlink = MIN (v->m_lowlink, w->m_index);
+ }
+ }
+
+ /* If v is a root node, pop the stack and generate an SCC. */
+
+ if (v->m_lowlink == v->m_index)
+ {
+ per_node_data *w;
+ do {
+ int idx = m_stack.pop ();
+ w = &m_per_node[idx];
+ w->m_on_stack = false;
+ } while (w != v);
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* worklist's ctor. */
+
+worklist::worklist (const exploded_graph &eg, const analysis_plan &plan)
+: m_eg (eg),
+ m_scc (eg.get_supergraph (), eg.get_logger ()),
+ m_plan (plan),
+ m_queue (key_t (*this, NULL))
+{
+}
+
+/* Return the number of nodes in the worklist. */
+
+unsigned
+worklist::length () const
+{
+ return m_queue.nodes ();
+}
+
+/* Return the next node in the worklist, removing it. */
+
+exploded_node *
+worklist::take_next ()
+{
+ return m_queue.extract_min ();
+}
+
+/* Return the next node in the worklist without removing it. */
+
+exploded_node *
+worklist::peek_next ()
+{
+ return m_queue.min ();
+}
+
+/* Add ENODE to the worklist. */
+
+void
+worklist::add_node (exploded_node *enode)
+{
+ m_queue.insert (key_t (*this, enode), enode);
+}
+
+/* Comparator for implementing worklist::key_t comparison operators.
+ Return negative if KA is before KB
+ Return positive if KA is after KB
+ Return 0 if they are equal. */
+
+int
+worklist::key_t::cmp_1 (const worklist::key_t &ka, const worklist::key_t &kb)
+{
+ const program_point &point_a = ka.m_enode->get_point ();
+ const program_point &point_b = kb.m_enode->get_point ();
+ const call_string &call_string_a = point_a.get_call_string ();
+ const call_string &call_string_b = point_b.get_call_string ();
+
+ /* Order empty-callstring points with different functions based on the
+ analysis_plan, so that we generate summaries before they are used. */
+ if (flag_analyzer_call_summaries
+ && call_string_a.empty_p ()
+ && call_string_b.empty_p ()
+ && point_a.get_function () != NULL
+ && point_b.get_function () != NULL
+ && point_a.get_function () != point_b.get_function ())
+ {
+ return ka.m_worklist.m_plan.cmp_function (point_a.get_function (),
+ point_b.get_function ());
+ }
+
+ /* First, order by SCC. */
+ int scc_id_a = ka.get_scc_id (ka.m_enode);
+ int scc_id_b = kb.get_scc_id (kb.m_enode);
+ if (scc_id_a != scc_id_b)
+ return scc_id_a - scc_id_b;
+
+ /* If in same SCC, order by supernode index (an arbitrary but stable
+ ordering). */
+ const supernode *snode_a = ka.m_enode->get_supernode ();
+ const supernode *snode_b = kb.m_enode->get_supernode ();
+ if (snode_a == NULL)
+ {
+ if (snode_b != NULL)
+ /* One is NULL. */
+ return -1;
+ else
+ /* Both are NULL. */
+ return 0;
+ }
+ if (snode_b == NULL)
+ /* One is NULL. */
+ return 1;
+ /* Neither are NULL. */
+ gcc_assert (snode_a && snode_b);
+ if (snode_a->m_index != snode_b->m_index)
+ return snode_a->m_index - snode_b->m_index;
+
+ gcc_assert (snode_a == snode_b);
+
+ /* Order within supernode via program point. */
+ int within_snode_cmp
+ = function_point::cmp_within_supernode (point_a.get_function_point (),
+ point_b.get_function_point ());
+ if (within_snode_cmp)
+ return within_snode_cmp;
+
+ /* The points might vary by callstring; try sorting by callstring. */
+ int cs_cmp = call_string::cmp (call_string_a, call_string_b);
+ if (cs_cmp)
+ return cs_cmp;
+
+ /* Otherwise, we ought to have the same program_point. */
+ gcc_assert (point_a == point_b);
+
+ const program_state &state_a = ka.m_enode->get_state ();
+ const program_state &state_b = kb.m_enode->get_state ();
+
+ /* Sort by sm-state, so that identical sm-states are grouped
+ together in the worklist.
+ For now, sort by the hash value (might not be deterministic). */
+ for (unsigned sm_idx = 0; sm_idx < state_a.m_checker_states.length ();
+ ++sm_idx)
+ {
+ sm_state_map *smap_a = state_a.m_checker_states[sm_idx];
+ sm_state_map *smap_b = state_b.m_checker_states[sm_idx];
+
+ int sm_cmp = smap_a->hash () - smap_b->hash ();
+ if (sm_cmp)
+ return sm_cmp;
+ }
+
+ /* Otherwise, we have two enodes at the same program point but with
+ different states. We don't have a good total ordering on states,
+ so order them by enode index, so that we have at least have a
+ stable sort. */
+ return ka.m_enode->m_index - kb.m_enode->m_index;
+}
+
+/* Comparator for implementing worklist::key_t comparison operators.
+ Return negative if KA is before KB
+ Return positive if KA is after KB
+ Return 0 if they are equal. */
+
+int
+worklist::key_t::cmp (const worklist::key_t &ka, const worklist::key_t &kb)
+{
+ int result = cmp_1 (ka, kb);
+
+ /* Check that the ordering is symmetric */
+#if CHECKING_P
+ int reversed = cmp_1 (kb, ka);
+ gcc_assert (reversed == -result);
+#endif
+
+ /* We should only have 0 for equal (point, state) pairs. */
+ gcc_assert (result != 0
+ || (*ka.m_enode->get_ps_key ()
+ == *kb.m_enode->get_ps_key ()));
+
+ return result;
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* exploded_graph's ctor. */
+
+exploded_graph::exploded_graph (const supergraph &sg, logger *logger,
+ const extrinsic_state &ext_state,
+ const state_purge_map *purge_map,
+ const analysis_plan &plan,
+ int verbosity)
+: log_user (logger), m_sg (sg),
+ m_worklist (*this, plan),
+ m_ext_state (ext_state),
+ m_purge_map (purge_map),
+ m_plan (plan),
+ m_diagnostic_manager (logger, verbosity),
+ m_global_stats (m_sg.num_nodes ()),
+ m_functionless_stats (m_sg.num_nodes ()),
+ m_PK_AFTER_SUPERNODE_per_snode (m_sg.num_nodes ())
+{
+ m_origin = get_or_create_node (program_point (function_point (NULL, NULL,
+ 0, PK_ORIGIN),
+ call_string ()),
+ program_state (ext_state), NULL);
+ for (int i = 0; i < m_sg.num_nodes (); i++)
+ m_PK_AFTER_SUPERNODE_per_snode.quick_push (i);
+}
+
+/* exploded_graph's dtor. */
+
+exploded_graph::~exploded_graph ()
+{
+ for (function_stat_map_t::iterator iter = m_per_function_stats.begin ();
+ iter != m_per_function_stats.end ();
+ ++iter)
+ delete (*iter).second;
+
+ for (point_map_t::iterator iter = m_per_point_data.begin ();
+ iter != m_per_point_data.end ();
+ ++iter)
+ delete (*iter).second;
+}
+
+/* Ensure that there is an exploded_node representing an external call to
+ FUN, adding it to the worklist if creating it.
+
+ Add an edge from the origin exploded_node to the function entrypoint
+ exploded_node.
+
+ Return the exploded_node for the entrypoint to the function. */
+
+exploded_node *
+exploded_graph::add_function_entry (function *fun)
+{
+ program_point point = program_point::from_function_entry (m_sg, fun);
+ program_state state (m_ext_state);
+ state.m_region_model->push_frame (fun, NULL, NULL);
+
+ exploded_node *enode = get_or_create_node (point, state, NULL);
+ /* We should never fail to add such a node. */
+ gcc_assert (enode);
+ state_change change;
+ add_edge (m_origin, enode, NULL, change);
+ return enode;
+}
+
+/* Get or create an exploded_node for (POINT, STATE).
+ If a new node is created, it is added to the worklist.
+ If CHANGE is non-NULL, use it to suppress some purging of state,
+ to make generation of state_change_event instances easier. */
+
+exploded_node *
+exploded_graph::get_or_create_node (const program_point &point,
+ const program_state &state,
+ state_change *change)
+{
+ LOG_FUNC (get_logger ());
+ if (get_logger ())
+ {
+ format f (false);
+ pretty_printer *pp = get_logger ()->get_printer ();
+ start_log_line ();
+ pp_string (pp, "point: ");
+ point.print (pp, f);
+ end_log_line ();
+ start_log_line ();
+ pp_string (pp, "state: ");
+ state.dump (m_ext_state, true);
+ end_log_line ();
+ }
+
+ auto_cfun sentinel (point.get_function ());
+
+ state.validate (get_ext_state ());
+
+ //state.dump (get_ext_state ());
+
+ /* Prune state to try to improve the chances of a cache hit,
+ avoiding generating redundant nodes. */
+ program_state pruned_state = state.prune_for_point (*this, point, change);
+
+ pruned_state.validate (get_ext_state ());
+
+ //pruned_state.dump (get_ext_state ());
+
+ if (get_logger ())
+ {
+ pretty_printer *pp = get_logger ()->get_printer ();
+ start_log_line ();
+ pp_string (pp, "pruned_state: ");
+ pruned_state.dump_to_pp (m_ext_state, true, pp);
+ end_log_line ();
+ pruned_state.m_region_model->dump_to_pp (get_logger_pp (), true);
+ }
+
+ stats *per_fn_stats = get_or_create_function_stats (point.get_function ());
+
+ stats *per_cs_stats
+ = &get_or_create_per_call_string_data (point.get_call_string ())->m_stats;
+
+ point_and_state ps (point, pruned_state);
+ if (exploded_node **slot = m_point_and_state_to_node.get (&ps))
+ {
+ /* An exploded_node for PS already exists. */
+ log ("reused EN: %i", (*slot)->m_index);
+ m_global_stats.m_node_reuse_count++;
+ per_fn_stats->m_node_reuse_count++;
+ per_cs_stats->m_node_reuse_count++;
+ return *slot;
+ }
+
+ per_program_point_data *per_point_data
+ = get_or_create_per_program_point_data (point);
+
+ /* Consider merging state with another enode at this program_point. */
+ if (flag_analyzer_state_merge)
+ {
+ exploded_node *existing_enode;
+ unsigned i;
+ FOR_EACH_VEC_ELT (per_point_data->m_enodes, i, existing_enode)
+ {
+ log ("considering merging with existing EN: %i for point",
+ existing_enode->m_index);
+ gcc_assert (existing_enode->get_point () == point);
+ const program_state &existing_state = existing_enode->get_state ();
+
+ /* This merges successfully within the loop. */
+
+ program_state merged_state (m_ext_state);
+ if (pruned_state.can_merge_with_p (existing_state, m_ext_state,
+ &merged_state))
+ {
+ log ("merging new state with that of EN: %i",
+ existing_enode->m_index);
+
+ /* Try again for a cache hit. */
+ ps.set_state (merged_state);
+ if (exploded_node **slot = m_point_and_state_to_node.get (&ps))
+ {
+ /* An exploded_node for PS already exists. */
+ log ("reused EN: %i", (*slot)->m_index);
+ m_global_stats.m_node_reuse_after_merge_count++;
+ per_fn_stats->m_node_reuse_after_merge_count++;
+ per_cs_stats->m_node_reuse_after_merge_count++;
+ return *slot;
+ }
+
+ /* Otherwise, continue, using the merged state in "ps".
+ Given that merged_state's svalue_ids have no relationship
+ to those of the input state, and thus to those of CHANGE,
+ purge any svalue_ids from *CHANGE. */
+ if (change)
+ change->on_svalue_purge (svalue_id::from_int (0));
+ }
+ else
+ log ("not merging new state with that of EN: %i",
+ existing_enode->m_index);
+ }
+ }
+
+ /* Impose a limit on the number of enodes per program point, and
+ simply stop if we exceed it. */
+ if ((int)per_point_data->m_enodes.length ()
+ > PARAM_VALUE (PARAM_ANALYZER_MAX_ENODES_PER_PROGRAM_POINT))
+ {
+ log ("not creating enode; too many at program point");
+ warning_at (point.get_location (), OPT_Wanalyzer_too_complex,
+ "terminating analysis for this program point");
+ return NULL;
+ }
+
+ /* An exploded_node for "ps" doesn't already exist; create one. */
+ exploded_node *node = new exploded_node (ps, m_nodes.length ());
+ add_node (node);
+ m_point_and_state_to_node.put (node->get_ps_key (), node);
+
+ /* Update per-program_point data. */
+ per_point_data->m_enodes.safe_push (node);
+
+ const enum point_kind node_pk = node->get_point ().get_kind ();
+ m_global_stats.m_num_nodes[node_pk]++;
+ per_fn_stats->m_num_nodes[node_pk]++;
+ per_cs_stats->m_num_nodes[node_pk]++;
+
+ if (node_pk == PK_AFTER_SUPERNODE)
+ m_PK_AFTER_SUPERNODE_per_snode[point.get_supernode ()->m_index]++;
+
+ if (get_logger ())
+ {
+ format f (false);
+ pretty_printer *pp = get_logger ()->get_printer ();
+ log ("created EN: %i", node->m_index);
+ start_log_line ();
+ pp_string (pp, "point: ");
+ point.print (pp, f);
+ end_log_line ();
+ start_log_line ();
+ pp_string (pp, "pruned_state: ");
+ pruned_state.dump_to_pp (m_ext_state, true, pp);
+ end_log_line ();
+ }
+
+ /* Add the new node to the worlist. */
+ m_worklist.add_node (node);
+ return node;
+}
+
+/* Add an exploded_edge from SRC to DEST, recording its association
+ with SEDGE (which may be NULL), and, if non-NULL, taking ownership
+ of REWIND_INFO. */
+
+void
+exploded_graph::add_edge (exploded_node *src, exploded_node *dest,
+ const superedge *sedge,
+ const state_change &change,
+ rewind_info_t *rewind_info)
+{
+ exploded_edge *e = new exploded_edge (src, dest, sedge, change, rewind_info);
+ digraph::add_edge (e);
+}
+
+/* Ensure that this graph has per-program_point-data for POINT;
+ borrow a pointer to it. */
+
+per_program_point_data *
+exploded_graph::
+get_or_create_per_program_point_data (const program_point &point)
+{
+ if (per_program_point_data **slot = m_per_point_data.get (&point))
+ return *slot;
+
+ per_program_point_data *per_point_data = new per_program_point_data (point);
+ m_per_point_data.put (&per_point_data->m_key, per_point_data);
+ return per_point_data;
+}
+
+/* Ensure that this graph has per-call_string-data for CS;
+ borrow a pointer to it. */
+
+per_call_string_data *
+exploded_graph::get_or_create_per_call_string_data (const call_string &cs)
+{
+ if (per_call_string_data **slot = m_per_call_string_data.get (&cs))
+ return *slot;
+
+ per_call_string_data *data = new per_call_string_data (cs, m_sg.num_nodes ());
+ m_per_call_string_data.put (&data->m_key,
+ data);
+ return data;
+}
+
+/* Ensure that this graph has per-function-data for FUN;
+ borrow a pointer to it. */
+
+per_function_data *
+exploded_graph::get_or_create_per_function_data (function *fun)
+{
+ if (per_function_data **slot = m_per_function_data.get (fun))
+ return *slot;
+
+ per_function_data *data = new per_function_data ();
+ m_per_function_data.put (fun, data);
+ return data;
+}
+
+/* Get this graph's per-function-data for FUN if there is any,
+ otherwise NULL. */
+
+per_function_data *
+exploded_graph::get_per_function_data (function *fun) const
+{
+ if (per_function_data **slot
+ = const_cast <per_function_data_t &> (m_per_function_data).get (fun))
+ return *slot;
+
+ return NULL;
+}
+
+/* Return true if NODE and FUN should be traversed directly, rather than
+ called via other functions. */
+
+static bool
+toplevel_function_p (cgraph_node *node, function *fun, logger *logger)
+{
+ /* TODO: better logic here
+ e.g. only if more than one caller, and significantly complicated.
+ Perhaps some whole-callgraph analysis to decide if it's worth summarizing
+ an edge, and if so, we need summaries. */
+ if (flag_analyzer_call_summaries)
+ {
+ int num_call_sites = 0;
+ for (cgraph_edge *edge = node->callers; edge; edge = edge->next_caller)
+ ++num_call_sites;
+
+ /* For now, if there's more than one in-edge, and we want call
+ summaries, do it at the top level so that there's a chance
+ we'll have a summary when we need one. */
+ if (num_call_sites > 1)
+ {
+ if (logger)
+ logger->log ("traversing %qE (%i call sites)",
+ fun->decl, num_call_sites);
+ return true;
+ }
+ }
+
+ if (!TREE_PUBLIC (fun->decl))
+ {
+ if (logger)
+ logger->log ("not traversing %qE (static)", fun->decl);
+ return false;
+ }
+
+ if (logger)
+ logger->log ("traversing %qE (all checks passed)", fun->decl);
+
+ return true;
+}
+
+/* Add initial nodes to EG, with entrypoints for externally-callable
+ functions. */
+
+void
+exploded_graph::build_initial_worklist ()
+{
+ LOG_SCOPE (get_logger ());
+
+ cgraph_node *node;
+ FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (node)
+ {
+ function *fun = node->get_fun ();
+ if (!toplevel_function_p (node, fun, get_logger ()))
+ continue;
+ exploded_node *enode = add_function_entry (fun);
+ if (get_logger ())
+ log ("created EN %i for %qE entrypoint", enode->m_index, fun->decl);
+ }
+}
+
+/* The main loop of the analysis.
+ Take freshly-created exploded_nodes from the worklist, calling
+ process_node on them to explore the <point, state> graph.
+ Add edges to their successors, potentially creating new successors
+ (which are also added to the worklist). */
+
+void
+exploded_graph::process_worklist ()
+{
+ LOG_SCOPE (get_logger ());
+ auto_client_timevar tv ("exploded_graph::process_worklist");
+
+ while (m_worklist.length () > 0)
+ {
+ exploded_node *node = m_worklist.take_next ();
+ gcc_assert (node->m_succs.length () == 0
+ || node == m_origin);
+
+ log ("next to process: EN: %i", node->m_index);
+
+ /* Avoid exponential explosions of nodes by attempting to merge
+ nodes that are at the same program point and which have
+ sufficiently similar state. */
+ if (flag_analyzer_state_merge && node != m_origin)
+ if (exploded_node *node_2 = m_worklist.peek_next ())
+ {
+ gcc_assert (node->m_succs.length () == 0);
+ gcc_assert (node_2->m_succs.length () == 0);
+
+ gcc_assert (node != node_2);
+
+ log ("peek worklist: EN: %i", node_2->m_index);
+
+ if (node->get_point () == node_2->get_point ())
+ {
+ if (get_logger ())
+ {
+ format f (false);
+ pretty_printer *pp = get_logger ()->get_printer ();
+ start_log_line ();
+ get_logger ()->log_partial
+ ("got potential merge EN: %i and EN: %i at ",
+ node->m_index, node_2->m_index);
+ node->get_point ().print (pp, f);
+ end_log_line ();
+ }
+
+ const program_state &state = node->get_state ();
+ const program_state &state_2 = node_2->get_state ();
+
+ /* They shouldn't be equal, or we wouldn't have two
+ separate nodes. */
+ gcc_assert (state != state_2);
+
+ program_state merged_state (m_ext_state);
+ state_change change;
+ if (state.can_merge_with_p (state_2, m_ext_state,
+ &merged_state))
+ {
+ log ("merging EN: %i and EN: %i",
+ node->m_index, node_2->m_index);
+
+ if (merged_state == state)
+ {
+ /* Then merge node_2 into node by adding an edge. */
+ add_edge (node_2, node, NULL, change);
+
+ /* Remove node_2 from the worklist. */
+ m_worklist.take_next ();
+
+ /* Continue processing "node" below. */
+ }
+ else if (merged_state == state_2)
+ {
+ /* Then merge node into node_2, and leave node_2
+ in the worklist, to be processed on the next
+ iteration. */
+ add_edge (node, node_2, NULL, change);
+ continue;
+ }
+ else
+ {
+ /* We have a merged state that differs from
+ both state and state_2. */
+
+ /* Remove node_2 from the worklist. */
+ m_worklist.take_next ();
+
+ /* Create (or get) an exploded node for the merged
+ states, adding to the worklist. */
+ exploded_node *merged_enode
+ = get_or_create_node (node->get_point (),
+ merged_state, &change);
+ if (merged_enode == NULL)
+ continue;
+
+ log ("merged EN: %i and EN: %i into EN: %i",
+ node->m_index, node_2->m_index,
+ merged_enode->m_index);
+
+ /* "node" and "node_2" have both now been removed
+ from the worklist; we should not process them.
+
+ "merged_enode" may be a new node; if so it will be
+ processed in a subsequent iteration.
+ Alternatively, "merged_enode" could be an existing
+ node; one way the latter can
+ happen is if we end up merging a succession of
+ similar nodes into one. */
+
+ /* If merged_node is one of the two we were merging,
+ add it back to the worklist to ensure it gets
+ processed.
+
+ Add edges from the merged nodes to it (but not a
+ self-edge). */
+ if (merged_enode == node)
+ m_worklist.add_node (merged_enode);
+ else
+ add_edge (node, merged_enode, NULL, change);
+
+ if (merged_enode == node_2)
+ m_worklist.add_node (merged_enode);
+ else
+ add_edge (node_2, merged_enode, NULL, change);
+
+ continue;
+ }
+ }
+
+ /* TODO: should we attempt more than two nodes,
+ or just do pairs of nodes? (and hope that we get
+ a cascade of mergers). */
+ }
+ }
+
+ process_node (node);
+
+ /* Impose a hard limit on the number of exploded nodes, to ensure
+ that the analysis terminates in the face of pathological state
+ explosion (or bugs).
+
+ Specifically, the limit is on the number of PK_AFTER_SUPERNODE
+ exploded nodes, looking at supernode exit events.
+
+ We use exit rather than entry since there can be multiple
+ entry ENs, one per phi; the number of PK_AFTER_SUPERNODE ought
+ to be equivalent to the number of supernodes multiplied by the
+ number of states. */
+ const int limit
+ = m_sg.num_nodes () * PARAM_VALUE (PARAM_ANALYZER_BB_EXPLOSION_FACTOR);
+ if (m_global_stats.m_num_nodes[PK_AFTER_SUPERNODE] > limit)
+ {
+ log ("bailing out; too many nodes");
+ warning_at (node->get_point ().get_location (),
+ OPT_Wanalyzer_too_complex,
+ "analysis bailed out early"
+ " (%i 'after-snode' enodes; %i enodes)",
+ m_global_stats.m_num_nodes[PK_AFTER_SUPERNODE],
+ m_nodes.length ());
+ return;
+ }
+ }
+}
+
+/* Return true if STMT must appear at the start of its exploded node, and
+ thus we can't consolidate its effects within a run of other statements,
+ where PREV_STMT was the previous statement. */
+
+static bool
+stmt_requires_new_enode_p (const gimple *stmt,
+ const gimple *prev_stmt)
+{
+ /* Stop consolidating at calls to
+ "__analyzer_dump_exploded_nodes", so they always appear at the
+ start of an exploded_node. */
+ if (const gcall *call = dyn_cast <const gcall *> (stmt))
+ if (is_named_call_p (call, "__analyzer_dump_exploded_nodes",
+ 1))
+ return true;
+
+ /* If we had a PREV_STMT with an unknown location, and this stmt
+ has a known location, then if a state change happens here, it
+ could be consolidated into PREV_STMT, giving us an event with
+ no location. Ensure that STMT gets its own exploded_node to
+ avoid this. */
+ if (prev_stmt->location == UNKNOWN_LOCATION
+ && stmt->location != UNKNOWN_LOCATION)
+ return true;
+
+ return false;
+}
+
+/* The core of exploded_graph::process_worklist (the main analysis loop),
+ handling one node in the worklist.
+
+ Get successor <point, state> pairs for NODE, calling get_or_create on
+ them, and adding an exploded_edge to each successors.
+
+ Freshly-created nodes will be added to the worklist. */
+
+void
+exploded_graph::process_node (exploded_node *node)
+{
+ LOG_FUNC_1 (get_logger (), "EN: %i", node->m_index);
+
+ const program_point &point = node->get_point ();
+
+ /* Update cfun and input_location in case of an ICE: make it easier to
+ track down which source construct we're failing to handle. */
+ auto_cfun sentinel (node->get_function ());
+ const gimple *stmt = point.get_stmt ();
+ if (stmt)
+ input_location = stmt->location;
+
+ const program_state &state = node->get_state ();
+ if (get_logger ())
+ {
+ pretty_printer *pp = get_logger ()->get_printer ();
+ start_log_line ();
+ pp_string (pp, "point: ");
+ point.print (pp, format (false));
+ pp_string (pp, ", state: ");
+ state.dump_to_pp (m_ext_state, true, pp);
+ end_log_line ();
+ }
+
+ switch (point.get_kind ())
+ {
+ default:
+ gcc_unreachable ();
+ case PK_ORIGIN:
+ /* This node exists to simplify finding the shortest path
+ to an exploded_node. */
+ break;
+
+ case PK_BEFORE_SUPERNODE:
+ {
+ program_state next_state (state);
+ state_change change;
+
+ if (point.get_from_edge ())
+ {
+ impl_region_model_context ctxt (*this, node,
+ &state, &next_state, &change,
+ NULL);
+ const cfg_superedge *last_cfg_superedge
+ = point.get_from_edge ()->dyn_cast_cfg_superedge ();
+ if (last_cfg_superedge)
+ next_state.m_region_model->update_for_phis
+ (node->get_supernode (),
+ last_cfg_superedge,
+ &ctxt);
+ }
+
+ if (point.get_supernode ()->m_stmts.length () > 0)
+ {
+ program_point next_point
+ = program_point::before_stmt (point.get_supernode (), 0,
+ point.get_call_string ());
+ exploded_node *next
+ = get_or_create_node (next_point, next_state, &change);
+ if (next)
+ add_edge (node, next, NULL, change);
+ }
+ else
+ {
+ program_point next_point
+ = program_point::after_supernode (point.get_supernode (),
+ point.get_call_string ());
+ exploded_node *next = get_or_create_node (next_point, next_state,
+ &change);
+ if (next)
+ add_edge (node, next, NULL, change);
+ }
+ }
+ break;
+ case PK_BEFORE_STMT:
+ {
+ /* Determine the effect of a run of one or more statements
+ within one supernode, generating an edge to the program_point
+ after the last statement that's processed.
+
+ Stop iterating statements and thus consolidating into one enode
+ when:
+ - reaching the end of the statements in the supernode
+ - if an sm-state-change occurs (so that it gets its own
+ exploded_node)
+ - if "-fanalyzer-fine-grained" is active
+ - encountering certain statements must appear at the start of
+ their enode (for which stmt_requires_new_enode_p returns true)
+
+ Update next_state in-place, to get the result of the one
+ or more stmts that are processed. */
+ program_state next_state (state);
+ state_change change;
+ const supernode *snode = point.get_supernode ();
+ unsigned stmt_idx;
+ const gimple *prev_stmt = NULL;
+ for (stmt_idx = point.get_stmt_idx ();
+ stmt_idx < snode->m_stmts.length ();
+ stmt_idx++)
+ {
+ const gimple *stmt = snode->m_stmts[stmt_idx];
+
+ if (stmt_idx > point.get_stmt_idx ())
+ if (stmt_requires_new_enode_p (stmt, prev_stmt))
+ {
+ stmt_idx--;
+ break;
+ }
+ prev_stmt = stmt;
+
+ /* Process the stmt. */
+ bool any_sm_changes
+ = node->on_stmt (*this, snode, stmt, &next_state, &change);
+
+ if (any_sm_changes || flag_analyzer_fine_grained)
+ break;
+ }
+ unsigned next_idx = stmt_idx + 1;
+ program_point next_point
+ = (next_idx < point.get_supernode ()->m_stmts.length ()
+ ? program_point::before_stmt (point.get_supernode (), next_idx,
+ point.get_call_string ())
+ : program_point::after_supernode (point.get_supernode (),
+ point.get_call_string ()));
+ exploded_node *next = get_or_create_node (next_point,
+ next_state, &change);
+ if (next)
+ add_edge (node, next, NULL, change);
+ }
+ break;
+ case PK_AFTER_SUPERNODE:
+ {
+ /* If this is an EXIT BB, detect leaks, and potentially
+ create a function summary. */
+ if (point.get_supernode ()->return_p ())
+ {
+ node->detect_leaks (*this);
+ if (flag_analyzer_call_summaries
+ && point.get_call_string ().empty_p ())
+ {
+ /* TODO: create function summary
+ There can be more than one; each corresponds to a different
+ final enode in the function. */
+ if (get_logger ())
+ {
+ pretty_printer *pp = get_logger ()->get_printer ();
+ start_log_line ();
+ get_logger ()->log_partial
+ ("would create function summary for %qE; state: ",
+ point.get_fndecl ());
+ state.dump_to_pp (m_ext_state, true, pp);
+ end_log_line ();
+ }
+ per_function_data *per_fn_data
+ = get_or_create_per_function_data (point.get_function ());
+ per_fn_data->add_call_summary (node);
+ }
+ }
+ /* Traverse into successors of the supernode. */
+ int i;
+ superedge *succ;
+ FOR_EACH_VEC_ELT (point.get_supernode ()->m_succs, i, succ)
+ {
+ log ("considering SN: %i -> SN: %i",
+ succ->m_src->m_index, succ->m_dest->m_index);
+
+ state_change change;
+
+ program_point next_point
+ = program_point::before_supernode (succ->m_dest, succ,
+ point.get_call_string ());
+ program_state next_state (state);
+
+ if (!node->on_edge (*this, succ, &next_point, &next_state, &change))
+ {
+ log ("skipping impossible edge to SN: %i",
+ succ->m_dest->m_index);
+ continue;
+ }
+
+ exploded_node *next = get_or_create_node (next_point, next_state,
+ &change);
+ if (next)
+ add_edge (node, next, succ, change);
+ }
+ }
+ break;
+ }
+}
+
+/* Ensure that this graph has a stats instance for FN, return it.
+ FN can be NULL, in which case a stats instances is returned covering
+ "functionless" parts of the graph (the origin node). */
+
+stats *
+exploded_graph::get_or_create_function_stats (function *fn)
+{
+ if (!fn)
+ return &m_functionless_stats;
+
+ if (stats **slot = m_per_function_stats.get (fn))
+ return *slot;
+ else
+ {
+ int num_supernodes = fn ? n_basic_blocks_for_fn (fn) : 0;
+ /* not quite the num supernodes, but nearly. */
+ stats *new_stats = new stats (num_supernodes);
+ m_per_function_stats.put (fn, new_stats);
+ return new_stats;
+ }
+}
+
+/* Write all stats information to this graph's logger, if any. */
+
+void
+exploded_graph::log_stats () const
+{
+ if (!get_logger ())
+ return;
+
+ LOG_SCOPE (get_logger ());
+
+ log ("m_sg.num_nodes (): %i", m_sg.num_nodes ());
+ log ("m_nodes.length (): %i", m_nodes.length ());
+ log ("m_edges.length (): %i", m_edges.length ());
+
+ log ("global stats:");
+ m_global_stats.log (get_logger ());
+
+ for (function_stat_map_t::iterator iter = m_per_function_stats.begin ();
+ iter != m_per_function_stats.end ();
+ ++iter)
+ {
+ function *fn = (*iter).first;
+ log_scope s (get_logger (), function_name (fn));
+ (*iter).second->log (get_logger ());
+ }
+}
+
+/* Dump all stats information to OUT. */
+
+void
+exploded_graph::dump_stats (FILE *out) const
+{
+ fprintf (out, "m_sg.num_nodes (): %i\n", m_sg.num_nodes ());
+ fprintf (out, "m_nodes.length (): %i\n", m_nodes.length ());
+ fprintf (out, "m_edges.length (): %i\n", m_edges.length ());
+
+ fprintf (out, "global stats:\n");
+ m_global_stats.dump (out);
+
+ for (function_stat_map_t::iterator iter = m_per_function_stats.begin ();
+ iter != m_per_function_stats.end ();
+ ++iter)
+ {
+ function *fn = (*iter).first;
+ fprintf (out, "function: %s\n", function_name (fn));
+ (*iter).second->dump (out);
+ }
+
+ fprintf (out, "PK_AFTER_SUPERNODE per supernode:\n");
+ for (unsigned i = 0; i < m_PK_AFTER_SUPERNODE_per_snode.length (); i++)
+ fprintf (out, " SN %i: %3i\n", i, m_PK_AFTER_SUPERNODE_per_snode[i]);
+}
+
+void
+exploded_graph::dump_states_for_supernode (FILE *out,
+ const supernode *snode) const
+{
+ fprintf (out, "PK_AFTER_SUPERNODE nodes for SN: %i\n", snode->m_index);
+ int i;
+ exploded_node *enode;
+ int state_idx = 0;
+ FOR_EACH_VEC_ELT (m_nodes, i, enode)
+ {
+ const supernode *iter_snode = enode->get_supernode ();
+ if (enode->get_point ().get_kind () == PK_AFTER_SUPERNODE
+ && iter_snode == snode)
+ {
+ pretty_printer pp;
+ pp_format_decoder (&pp) = default_tree_printer;
+ enode->get_state ().dump_to_pp (m_ext_state, true, &pp);
+ fprintf (out, "state %i: EN: %i\n %s\n",
+ state_idx++, enode->m_index,
+ pp_formatted_text (&pp));
+ }
+ }
+ fprintf (out, "#exploded_node for PK_AFTER_SUPERNODE for SN: %i = %i\n",
+ snode->m_index, state_idx);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* Look for the last use of SEARCH_STMT within this path.
+ If found write the edge's index to *OUT_IDX and return true, otherwise
+ return false. */
+
+bool
+exploded_path::find_stmt_backwards (const gimple *search_stmt,
+ int *out_idx) const
+{
+ int i;
+ const exploded_edge *eedge;
+ FOR_EACH_VEC_ELT_REVERSE (m_edges, i, eedge)
+ {
+ const exploded_node *dst_node = eedge->m_dest;
+ const program_point &dst_point = dst_node->get_point ();
+ const gimple *stmt = dst_point.get_stmt ();
+ if (stmt == search_stmt)
+ {
+ *out_idx = i;
+ return true;
+ }
+ }
+ return false;
+}
+
+/* Get the final exploded_node in this path, which must be non-empty. */
+
+exploded_node *
+exploded_path::get_final_enode () const
+{
+ gcc_assert (m_edges.length () > 0);
+ return m_edges[m_edges.length () - 1]->m_dest;
+}
+
+/* Check state along this path, returning true if it is feasible. */
+
+bool
+exploded_path::feasible_p (logger *logger) const
+{
+ LOG_SCOPE (logger);
+
+ /* Traverse the path, updating this model. */
+ region_model model;
+ for (unsigned i = 0; i < m_edges.length (); i++)
+ {
+ const exploded_edge *eedge = m_edges[i];
+ if (logger)
+ logger->log ("considering edge %i: EN:%i -> EN:%i",
+ i,
+ eedge->m_src->m_index,
+ eedge->m_dest->m_index);
+ const exploded_node &src_enode = *eedge->m_src;
+ const program_point &src_point = src_enode.get_point ();
+ if (logger)
+ {
+ logger->start_log_line ();
+ src_point.print (logger->get_printer (), format (false));
+ logger->end_log_line ();
+ }
+
+ if (const gimple *stmt = src_point.get_stmt ())
+ {
+ /* Update cfun and input_location in case of ICE: make it easier to
+ track down which source construct we're failing to handle. */
+ auto_cfun sentinel (src_point.get_function ());
+ input_location = stmt->location;
+
+ if (const gassign *assign = dyn_cast <const gassign *> (stmt))
+ model.on_assignment (assign, NULL);
+ else if (const greturn *return_ = dyn_cast <const greturn *> (stmt))
+ model.on_return (return_, NULL);
+ }
+
+ const superedge *sedge = eedge->m_sedge;
+ if (sedge)
+ {
+ if (logger)
+ logger->log (" sedge: SN:%i -> SN:%i %s",
+ sedge->m_src->m_index,
+ sedge->m_dest->m_index,
+ sedge->get_description (false));
+
+ const gimple *last_stmt = src_point.get_supernode ()->get_last_stmt ();
+ if (!model.maybe_update_for_edge (*sedge, last_stmt, NULL))
+ {
+ if (logger)
+ logger->log ("rejecting due to region model");
+ return false;
+ }
+ }
+ else
+ {
+ /* Special-case the initial eedge from the origin node to the
+ initial function by pushing a frame for it. */
+ if (i == 0)
+ {
+ gcc_assert (eedge->m_src->m_index == 0);
+ gcc_assert (src_point.get_kind () == PK_ORIGIN);
+ gcc_assert (eedge->m_dest->get_point ().get_kind ()
+ == PK_BEFORE_SUPERNODE);
+ function *fun = eedge->m_dest->get_function ();
+ gcc_assert (fun);
+ model.push_frame (fun, NULL, NULL);
+ if (logger)
+ logger->log (" pushing frame for %qD", fun->decl);
+ }
+ else if (eedge->m_rewind_info)
+ {
+ /* Update state for the special-case of a rewind of a longjmp
+ to a setjmp (which doesn't have a superedge, but does affect
+ state). */
+ const gimple *last_stmt
+ = src_point.get_supernode ()->get_last_stmt ();
+ gcc_assert (last_stmt);
+ const gcall *longjmp_call = as_a <const gcall *> (last_stmt);
+
+ const program_point &longjmp_point = eedge->m_src->get_point ();
+ const program_point &setjmp_point = eedge->m_dest->get_point ();
+
+ gcc_assert (longjmp_point.get_stack_depth ()
+ >= setjmp_point.get_stack_depth ());
+
+ model.on_longjmp (longjmp_call,
+ eedge->m_rewind_info->get_setjmp_call (),
+ setjmp_point.get_stack_depth (), NULL);
+ }
+ }
+
+ /* Handle phi nodes on an edge leaving a PK_BEFORE_SUPERNODE (to
+ a PK_BEFORE_STMT, or a PK_AFTER_SUPERNODE if no stmts).
+ This will typically not be associated with a superedge. */
+ if (src_point.get_from_edge ())
+ {
+ const cfg_superedge *last_cfg_superedge
+ = src_point.get_from_edge ()->dyn_cast_cfg_superedge ();
+ if (last_cfg_superedge)
+ {
+ if (logger)
+ logger->log (" update for phis");
+ model.update_for_phis (src_enode.get_supernode (),
+ last_cfg_superedge,
+ NULL);
+ }
+ }
+
+ if (logger)
+ {
+ logger->log ("state after edge %i: EN:%i -> EN:%i",
+ i,
+ eedge->m_src->m_index,
+ eedge->m_dest->m_index);
+ logger->start_log_line ();
+ model.dump_to_pp (logger->get_printer (), true);
+ logger->end_log_line ();
+ }
+ }
+
+ return true;
+}
+
+/* Dump this path in multiline form to PP. */
+
+void
+exploded_path::dump_to_pp (pretty_printer *pp) const
+{
+ for (unsigned i = 0; i < m_edges.length (); i++)
+ {
+ const exploded_edge *eedge = m_edges[i];
+ pp_printf (pp, "m_edges[%i]: EN %i -> EN %i",
+ i,
+ eedge->m_src->m_index,
+ eedge->m_dest->m_index);
+ pp_newline (pp);
+ }
+}
+
+/* Dump this path in multiline form to FP. */
+
+void
+exploded_path::dump (FILE *fp) const
+{
+ pretty_printer pp;
+ pp_format_decoder (&pp) = default_tree_printer;
+ pp_show_color (&pp) = pp_show_color (global_dc->printer);
+ pp.buffer->stream = fp;
+ dump_to_pp (&pp);
+ pp_flush (&pp);
+}
+
+/* Dump this path in multiline form to stderr. */
+
+DEBUG_FUNCTION void
+exploded_path::dump () const
+{
+ dump (stderr);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* A family of cluster subclasses for use when generating .dot output for
+ exploded graphs (-fdump-analyzer-exploded-graph), for grouping the
+ enodes into hierarchical boxes.
+
+ All functionless enodes appear in the top-level graph.
+ Every (function, call_string) pair gets its own cluster. Within that
+ cluster, each supernode gets its own cluster.
+
+ Hence all enodes relating to a particular function with a particular
+ callstring will be be in a cluster together; all enodes for the same
+ function but with a different callstring will be in a different
+ cluster. */
+
+/* Base class of cluster for clustering exploded_node instances in .dot
+ output, based on various subclass-specific criteria. */
+
+class exploded_cluster : public cluster<eg_traits>
+{
+};
+
+/* Cluster containing all exploded_node instances for one supernode. */
+
+class supernode_cluster : public exploded_cluster
+{
+public:
+ supernode_cluster (const supernode *supernode) : m_supernode (supernode) {}
+
+ // TODO: dtor?
+
+ void dump_dot (graphviz_out *gv, const dump_args_t &args) const FINAL OVERRIDE
+ {
+ gv->println ("subgraph \"cluster_supernode_%p\" {",
+ (const void *)this);
+ gv->indent ();
+ gv->println ("style=\"dashed\";");
+ gv->println ("label=\"SN: %i\";", m_supernode->m_index);
+
+ int i;
+ exploded_node *enode;
+ FOR_EACH_VEC_ELT (m_enodes, i, enode)
+ enode->dump_dot (gv, args);
+
+ /* Terminate subgraph. */
+ gv->outdent ();
+ gv->println ("}");
+ }
+
+ void add_node (exploded_node *en) FINAL OVERRIDE
+ {
+ m_enodes.safe_push (en);
+ }
+
+private:
+ const supernode *m_supernode;
+ auto_vec <exploded_node *> m_enodes;
+};
+
+/* Cluster containing all supernode_cluster instances for one
+ (function, call_string) pair. */
+
+class function_call_string_cluster : public exploded_cluster
+{
+public:
+ function_call_string_cluster (function *fun, call_string cs)
+ : m_fun (fun), m_cs (cs) {}
+
+ ~function_call_string_cluster ()
+ {
+ for (map_t::iterator iter = m_map.begin ();
+ iter != m_map.end ();
+ ++iter)
+ delete (*iter).second;
+ }
+
+ void dump_dot (graphviz_out *gv, const dump_args_t &args) const FINAL OVERRIDE
+ {
+ const char *funcname = function_name (m_fun);
+
+ gv->println ("subgraph \"cluster_function_%p\" {", (const void *)this);
+ gv->indent ();
+ gv->write_indent ();
+ gv->print ("label=\"call string: ");
+ m_cs.print (gv->get_pp ());
+ gv->print (" function: %s \";", funcname);
+ gv->print ("\n");
+
+ for (map_t::iterator iter = m_map.begin ();
+ iter != m_map.end ();
+ ++iter)
+ (*iter).second->dump_dot (gv, args);
+
+ /* Terminate subgraph. */
+ gv->outdent ();
+ gv->println ("}");
+ }
+
+ void add_node (exploded_node *en) FINAL OVERRIDE
+ {
+ const supernode *supernode = en->get_supernode ();
+ gcc_assert (supernode);
+ supernode_cluster **slot = m_map.get (supernode);
+ if (slot)
+ (*slot)->add_node (en);
+ else
+ {
+ supernode_cluster *child = new supernode_cluster (supernode);
+ m_map.put (supernode, child);
+ child->add_node (en);
+ }
+ }
+
+private:
+ function *m_fun;
+ call_string m_cs;
+ typedef ordered_hash_map<const supernode *, supernode_cluster *> map_t;
+ map_t m_map;
+};
+
+/* Keys for root_cluster. */
+
+struct function_call_string
+{
+ function_call_string (function *fun, call_string cs)
+ : m_fun (fun), m_cs (cs)
+ {
+ gcc_assert (fun);
+ }
+
+ function *m_fun;
+ call_string m_cs;
+};
+
+template <> struct default_hash_traits<function_call_string>
+: public pod_hash_traits<function_call_string>
+{
+};
+
+template <>
+inline hashval_t
+pod_hash_traits<function_call_string>::hash (value_type v)
+{
+ return pointer_hash <function>::hash (v.m_fun) ^ v.m_cs.hash ();
+}
+
+template <>
+inline bool
+pod_hash_traits<function_call_string>::equal (const value_type &existing,
+ const value_type &candidate)
+{
+ return existing.m_fun == candidate.m_fun && existing.m_cs == candidate.m_cs;
+}
+template <>
+inline void
+pod_hash_traits<function_call_string>::mark_deleted (value_type &v)
+{
+ v.m_fun = reinterpret_cast<function *> (1);
+}
+template <>
+inline void
+pod_hash_traits<function_call_string>::mark_empty (value_type &v)
+{
+ v.m_fun = reinterpret_cast<function *> (NULL);
+}
+template <>
+inline bool
+pod_hash_traits<function_call_string>::is_deleted (value_type v)
+{
+ return v.m_fun == reinterpret_cast<function *> (1);
+}
+template <>
+inline bool
+pod_hash_traits<function_call_string>::is_empty (value_type v)
+{
+ return v.m_fun == reinterpret_cast<function *> (NULL);
+}
+
+/* Top-level cluster for generating .dot output for exploded graphs,
+ handling the functionless nodes, and grouping the remaining nodes by
+ callstring. */
+
+class root_cluster : public exploded_cluster
+{
+public:
+ ~root_cluster ()
+ {
+ for (map_t::iterator iter = m_map.begin ();
+ iter != m_map.end ();
+ ++iter)
+ delete (*iter).second;
+ }
+
+ void dump_dot (graphviz_out *gv, const dump_args_t &args) const FINAL OVERRIDE
+ {
+ int i;
+ exploded_node *enode;
+ FOR_EACH_VEC_ELT (m_functionless_enodes, i, enode)
+ enode->dump_dot (gv, args);
+
+ for (map_t::iterator iter = m_map.begin ();
+ iter != m_map.end ();
+ ++iter)
+ (*iter).second->dump_dot (gv, args);
+ }
+
+ void add_node (exploded_node *en) FINAL OVERRIDE
+ {
+ function *fun = en->get_function ();
+ if (!fun)
+ {
+ m_functionless_enodes.safe_push (en);
+ return;
+ }
+
+ const call_string &cs = en->get_point ().get_call_string ();
+ function_call_string key (fun, cs);
+ function_call_string_cluster **slot = m_map.get (key);
+ if (slot)
+ (*slot)->add_node (en);
+ else
+ {
+ function_call_string_cluster *child
+ = new function_call_string_cluster (fun, cs);
+ m_map.put (key, child);
+ child->add_node (en);
+ }
+ }
+
+private:
+ /* This can't be an ordered_hash_map, as we can't store vec<call_string>,
+ since it's not a POD; vec<>::quick_push has:
+ *slot = obj;
+ and the slot isn't initialized, so the assignment op dies when cleaning up
+ un-inited *slot (within the truncate call). */
+ typedef hash_map<function_call_string, function_call_string_cluster *> map_t;
+ map_t m_map;
+
+ /* This should just be the origin exploded_node. */
+ auto_vec <exploded_node *> m_functionless_enodes;
+};
+
+////////////////////////////////////////////////////////////////////////////
+
+/* Subclass of range_label for use within
+ exploded_graph::dump_exploded_nodes for implementing
+ -fdump-analyzer-exploded-nodes: a label for a specific
+ exploded_node. */
+
+class enode_label : public range_label
+{
+ public:
+ enode_label (const extrinsic_state &ext_state,
+ exploded_node *enode)
+ : m_ext_state (ext_state), m_enode (enode) {}
+
+ label_text get_text (unsigned) const FINAL OVERRIDE
+ {
+ pretty_printer pp;
+ pp_format_decoder (&pp) = default_tree_printer;
+ m_enode->get_state ().dump_to_pp (m_ext_state, true, &pp);
+ return make_label_text (false, "EN: %i: %s",
+ m_enode->m_index, pp_formatted_text (&pp));
+ }
+
+private:
+ const extrinsic_state &m_ext_state;
+ exploded_node *m_enode;
+};
+
+/* Postprocessing support for dumping the exploded nodes.
+ Handle -fdump-analyzer-exploded-nodes,
+ -fdump-analyzer-exploded-nodes-2, and the
+ "__analyzer_dump_exploded_nodes" builtin. */
+
+void
+exploded_graph::dump_exploded_nodes () const
+{
+ // TODO
+ /* Locate calls to __analyzer_dump_exploded_nodes. */
+ // Print how many egs there are for them?
+ /* Better: log them as we go, and record the exploded nodes
+ in question. */
+
+ /* Show every enode. */
+
+ /* Gather them by stmt, so that we can more clearly see the
+ "hotspots" requiring numerous exploded nodes. */
+
+ /* Alternatively, simply throw them all into one big rich_location
+ and see if the label-printing will sort it out...
+ This requires them all to be in the same source file. */
+
+ if (flag_dump_analyzer_exploded_nodes)
+ {
+ auto_client_timevar tv ("-fdump-analyzer-exploded-nodes");
+ gcc_rich_location richloc (UNKNOWN_LOCATION);
+ unsigned i;
+ exploded_node *enode;
+ FOR_EACH_VEC_ELT (m_nodes, i, enode)
+ {
+ if (const gimple *stmt = enode->get_stmt ())
+ {
+ if (richloc.get_loc () == UNKNOWN_LOCATION)
+ richloc.set_range (0, stmt->location, SHOW_RANGE_WITH_CARET);
+ else
+ richloc.add_range (stmt->location,
+ SHOW_RANGE_WITHOUT_CARET,
+ new enode_label (m_ext_state, enode));
+ }
+ }
+ warning_at (&richloc, 0, "%i exploded nodes", m_nodes.length ());
+
+ /* Repeat the warning without all the labels, so that message is visible
+ (the other one may well have scrolled past the terminal limit). */
+ warning_at (richloc.get_loc (), 0,
+ "%i exploded nodes", m_nodes.length ());
+
+ if (m_worklist.length () > 0)
+ warning_at (richloc.get_loc (), 0,
+ "worklist still contains %i nodes", m_worklist.length ());
+ }
+
+ /* Dump the egraph in textual form to a dump file. */
+ if (flag_dump_analyzer_exploded_nodes_2)
+ {
+ auto_client_timevar tv ("-fdump-analyzer-exploded-nodes-2");
+ char *filename
+ = concat (dump_base_name, ".eg.txt", NULL);
+ FILE *outf = fopen (filename, "w");
+ if (!outf)
+ error_at (UNKNOWN_LOCATION, "unable to open %qs for writing", filename);
+ free (filename);
+
+ fprintf (outf, "exploded graph for %s\n", dump_base_name);
+ fprintf (outf, " nodes: %i\n", m_nodes.length ());
+ fprintf (outf, " edges: %i\n", m_edges.length ());
+
+ unsigned i;
+ exploded_node *enode;
+ FOR_EACH_VEC_ELT (m_nodes, i, enode)
+ {
+ fprintf (outf, "\nEN %i:\n", enode->m_index);
+ enode->dump_succs_and_preds (outf);
+ pretty_printer pp;
+ enode->get_point ().print (&pp, format (true));
+ fprintf (outf, "%s\n", pp_formatted_text (&pp));
+ enode->get_state ().dump_to_file (m_ext_state, false, outf);
+ }
+
+ fclose (outf);
+ }
+
+ /* Dump the egraph in textual form to multiple dump files, one per enode. */
+ if (flag_dump_analyzer_exploded_nodes_3)
+ {
+ auto_client_timevar tv ("-fdump-analyzer-exploded-nodes-3");
+
+ unsigned i;
+ exploded_node *enode;
+ FOR_EACH_VEC_ELT (m_nodes, i, enode)
+ {
+ char *filename
+ = xasprintf ("%s.en-%i.txt", dump_base_name, i);
+ FILE *outf = fopen (filename, "w");
+ if (!outf)
+ error_at (UNKNOWN_LOCATION, "unable to open %qs for writing", filename);
+ free (filename);
+
+ fprintf (outf, "EN %i:\n", enode->m_index);
+ enode->dump_succs_and_preds (outf);
+ pretty_printer pp;
+ enode->get_point ().print (&pp, format (true));
+ fprintf (outf, "%s\n", pp_formatted_text (&pp));
+ enode->get_state ().dump_to_file (m_ext_state, false, outf);
+
+ fclose (outf);
+ }
+ }
+
+ /* Emit a warning at any call to "__analyzer_dump_exploded_nodes",
+ giving the number of exploded nodes for "before-stmt", and their
+ IDs. */
+
+ unsigned i;
+ exploded_node *enode;
+ hash_set<const gimple *> seen;
+ FOR_EACH_VEC_ELT (m_nodes, i, enode)
+ {
+ if (enode->get_point ().get_kind () != PK_BEFORE_STMT)
+ continue;
+
+ if (const gimple *stmt = enode->get_stmt ())
+ if (const gcall *call = dyn_cast <const gcall *> (stmt))
+ if (is_named_call_p (call, "__analyzer_dump_exploded_nodes", 1))
+ {
+ if (seen.contains (stmt))
+ continue;
+
+ /* This is O(N^2). */
+ unsigned j;
+ auto_vec<exploded_node *> enodes;
+ exploded_node *other_enode;
+ FOR_EACH_VEC_ELT (m_nodes, j, other_enode)
+ {
+ if (other_enode->get_point ().get_kind () != PK_BEFORE_STMT)
+ continue;
+ if (other_enode->get_stmt () == stmt)
+ enodes.safe_push (other_enode);
+ }
+
+ pretty_printer pp;
+ print_enode_indices (&pp, enodes);
+
+ warning_n (stmt->location, 0, enodes.length (),
+ "%i exploded node: %s",
+ "%i exploded nodes: %s",
+ enodes.length (), pp_formatted_text (&pp));
+ seen.add (stmt);
+
+ /* If the argument is non-zero, then print all of the states
+ of the various enodes. */
+ tree t_arg = fold (gimple_call_arg (call, 0));
+ if (TREE_CODE (t_arg) != INTEGER_CST)
+ {
+ error_at (call->location,
+ "integer constant required for arg 1");
+ return;
+ }
+ int i_arg = TREE_INT_CST_LOW (t_arg);
+ if (i_arg)
+ {
+ exploded_node *other_enode;
+ FOR_EACH_VEC_ELT (enodes, j, other_enode)
+ {
+ fprintf (stderr, "%i of %i: EN %i:\n",
+ j + 1, enodes.length (), other_enode->m_index);
+ other_enode->dump_succs_and_preds (stderr);
+ /* Dump state. */
+ other_enode->get_state ().dump (m_ext_state, false);
+ }
+ }
+ }
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* A collection of classes for visualizing the callgraph in .dot form
+ (as represented in the supergraph). */
+
+/* Forward decls. */
+class viz_callgraph_node;
+class viz_callgraph_edge;
+class viz_callgraph;
+class viz_callgraph_cluster;
+
+/* Traits for using "digraph.h" to visualize the callgraph. */
+
+struct viz_callgraph_traits
+{
+ typedef viz_callgraph_node node_t;
+ typedef viz_callgraph_edge edge_t;
+ typedef viz_callgraph graph_t;
+ struct dump_args_t
+ {
+ dump_args_t (const exploded_graph *eg) : m_eg (eg) {}
+ const exploded_graph *m_eg;
+ };
+ typedef viz_callgraph_cluster cluster_t;
+};
+
+/* Subclass of dnode representing a function within the callgraph. */
+
+class viz_callgraph_node : public dnode<viz_callgraph_traits>
+{
+ friend class viz_callgraph;
+
+public:
+ viz_callgraph_node (function *fun, int index)
+ : m_fun (fun), m_index (index), m_num_supernodes (0), m_num_superedges (0)
+ {
+ gcc_assert (fun);
+ }
+
+ void dump_dot (graphviz_out *gv, const dump_args_t &args) const FINAL OVERRIDE
+ {
+ pretty_printer *pp = gv->get_pp ();
+
+ dump_dot_id (pp);
+ pp_printf (pp, " [shape=%s,style=filled,fillcolor=%s,label=\"",
+ "record", "lightgrey");
+ pp_left_brace (pp);
+ pp_write_text_to_stream (pp);
+
+ pp_printf (pp, "VCG: %i: %s", m_index, function_name (m_fun));
+ pp_newline (pp);
+
+ pp_printf (pp, "supernodes: %i\n", m_num_supernodes);
+ pp_newline (pp);
+ pp_printf (pp, "superedges: %i\n", m_num_superedges);
+ pp_newline (pp);
+
+ if (args.m_eg)
+ {
+ unsigned i;
+ exploded_node *enode;
+ unsigned num_enodes = 0;
+ FOR_EACH_VEC_ELT (args.m_eg->m_nodes, i, enode)
+ {
+ if (enode->get_point ().get_function () == m_fun)
+ num_enodes++;
+ }
+ pp_printf (pp, "enodes: %i\n", num_enodes);
+ pp_newline (pp);
+
+ // TODO: also show the per-callstring breakdown
+ const exploded_graph::call_string_data_map_t *per_cs_data
+ = args.m_eg->get_per_call_string_data ();
+ for (typename exploded_graph::call_string_data_map_t::iterator iter
+ = per_cs_data->begin ();
+ iter != per_cs_data->end ();
+ ++iter)
+ {
+ const call_string *cs = (*iter).first;
+ //per_call_string_data *data = (*iter).second;
+ num_enodes = 0;
+ FOR_EACH_VEC_ELT (args.m_eg->m_nodes, i, enode)
+ {
+ if (enode->get_point ().get_function () == m_fun
+ && enode->get_point ().get_call_string () == *cs)
+ num_enodes++;
+ }
+ if (num_enodes > 0)
+ {
+ cs->print (pp);
+ pp_printf (pp, ": %i\n", num_enodes);
+ }
+ }
+
+ /* Show any summaries. */
+ per_function_data *data = args.m_eg->get_per_function_data (m_fun);
+ if (data)
+ {
+ pp_newline (pp);
+ pp_printf (pp, "summaries: %i\n", data->m_summaries.length ());
+ }
+ }
+
+ pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/true);
+ pp_right_brace (pp);
+ pp_string (pp, "\"];\n\n");
+ pp_flush (pp);
+ }
+
+ void dump_dot_id (pretty_printer *pp) const
+ {
+ pp_printf (pp, "vcg_%i", m_index);
+ }
+
+private:
+ function *m_fun;
+ int m_index;
+ int m_num_supernodes;
+ int m_num_superedges;
+};
+
+/* Subclass of dedge representing a callgraph edge. */
+
+class viz_callgraph_edge : public dedge<viz_callgraph_traits>
+{
+public:
+ viz_callgraph_edge (viz_callgraph_node *src, viz_callgraph_node *dest,
+ const call_superedge *call_sedge)
+ : dedge (src, dest),
+ m_call_sedge (call_sedge)
+ {}
+
+ void dump_dot (graphviz_out *gv, const dump_args_t &) const
+ FINAL OVERRIDE
+ {
+ pretty_printer *pp = gv->get_pp ();
+
+ const char *style = "\"solid,bold\"";
+ const char *color = "black";
+ int weight = 10;
+ const char *constraint = "true";
+
+ m_src->dump_dot_id (pp);
+ pp_string (pp, " -> ");
+ m_dest->dump_dot_id (pp);
+ pp_printf (pp,
+ (" [style=%s, color=%s, weight=%d, constraint=%s,"
+ " headlabel=\""),
+ style, color, weight, constraint);
+ pp_printf (pp, "\"];\n");
+ }
+
+private:
+ const call_superedge * const m_call_sedge;
+};
+
+/* Subclass of digraph representing the callgraph. */
+
+class viz_callgraph : public digraph<viz_callgraph_traits>
+{
+public:
+ viz_callgraph (const supergraph &sg);
+
+ viz_callgraph_node *get_vcg_node_for_function (function *fun)
+ {
+ return *m_map.get (fun);
+ }
+
+ viz_callgraph_node *get_vcg_node_for_snode (supernode *snode)
+ {
+ return get_vcg_node_for_function (snode->m_fun);
+ }
+
+private:
+ const supergraph &m_sg;
+ hash_map<function *, viz_callgraph_node *> m_map;
+};
+
+/* Placeholder subclass of cluster. */
+
+class viz_callgraph_cluster : public cluster<viz_callgraph_traits>
+{
+};
+
+/* viz_callgraph's ctor. */
+
+viz_callgraph::viz_callgraph (const supergraph &sg)
+: m_sg (sg)
+{
+ cgraph_node *node;
+ FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (node)
+ {
+ function *fun = node->get_fun ();
+ viz_callgraph_node *vcg_node
+ = new viz_callgraph_node (fun, m_nodes.length ());
+ m_map.put (fun, vcg_node);
+ add_node (vcg_node);
+ }
+
+ unsigned i;
+ superedge *sedge;
+ FOR_EACH_VEC_ELT (sg.m_edges, i, sedge)
+ {
+ viz_callgraph_node *vcg_src = get_vcg_node_for_snode (sedge->m_src);
+ if (vcg_src->m_fun)
+ get_vcg_node_for_function (vcg_src->m_fun)->m_num_superedges++;
+ if (const call_superedge *call_sedge = sedge->dyn_cast_call_superedge ())
+ {
+ viz_callgraph_node *vcg_dest = get_vcg_node_for_snode (sedge->m_dest);
+ viz_callgraph_edge *vcg_edge
+ = new viz_callgraph_edge (vcg_src, vcg_dest, call_sedge);
+ add_edge (vcg_edge);
+ }
+ }
+
+ supernode *snode;
+ FOR_EACH_VEC_ELT (sg.m_nodes, i, snode)
+ {
+ if (snode->m_fun)
+ get_vcg_node_for_function (snode->m_fun)->m_num_supernodes++;
+ }
+}
+
+/* Dump the callgraph to FILENAME. */
+
+static void
+dump_callgraph (const supergraph &sg, const char *filename,
+ const exploded_graph *eg)
+{
+ FILE *outf = fopen (filename, "w");
+ if (!outf)
+ return;
+
+ // TODO
+ viz_callgraph vcg (sg);
+ vcg.dump_dot (filename, NULL, viz_callgraph_traits::dump_args_t (eg));
+
+ fclose (outf);
+}
+
+/* Dump the callgraph to "<srcfile>.callgraph.dot". */
+
+static void
+dump_callgraph (const supergraph &sg, const exploded_graph *eg)
+{
+ auto_client_timevar tv ("writing .callgraph.dot");
+ char *filename = concat (dump_base_name, ".callgraph.dot", NULL);
+ dump_callgraph (sg, filename, eg);
+ free (filename);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+/* Run the analysis "engine". */
+
+void
+impl_run_checkers (logger *logger)
+{
+ LOG_SCOPE (logger);
+
+ /* If using LTO, ensure that the cgraph nodes have function bodies. */
+ cgraph_node *node;
+ FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (node)
+ node->get_untransformed_body ();
+
+ /* Create the supergraph. */
+ supergraph sg (logger);
+
+ state_purge_map *purge_map = NULL;
+
+ if (flag_analyzer_state_purge)
+ purge_map = new state_purge_map (sg, logger);
+
+ if (flag_dump_analyzer_supergraph)
+ {
+ auto_client_timevar tv ("writing .supergraph.dot");
+ char *filename = concat (dump_base_name, ".supergraph.dot", NULL);
+ supergraph::dump_args_t args ((enum supergraph_dot_flags)0, NULL);
+ sg.dump_dot (filename, args);
+ free (filename);
+ }
+
+ if (flag_dump_analyzer_state_purge)
+ {
+ auto_client_timevar tv ("writing .state-purge.dot");
+ state_purge_annotator a (purge_map);
+ char *filename = concat (dump_base_name, ".state-purge.dot", NULL);
+ supergraph::dump_args_t args ((enum supergraph_dot_flags)0, &a);
+ sg.dump_dot (filename, args);
+ free (filename);
+ }
+
+ auto_delete_vec <state_machine> checkers;
+ make_checkers (checkers, logger);
+
+ if (logger)
+ {
+ int i;
+ state_machine *sm;
+ FOR_EACH_VEC_ELT (checkers, i, sm)
+ logger->log ("checkers[%i]: %s", i, sm->get_name ());
+ }
+
+ /* Extrinsic state shared by nodes in the graph. */
+ const extrinsic_state ext_state (checkers);
+
+ const analysis_plan plan (sg, logger);
+
+ /* The exploded graph. */
+ exploded_graph eg (sg, logger, ext_state, purge_map, plan,
+ analyzer_verbosity);
+
+ /* Add entrypoints to the graph for externally-callable functions. */
+ eg.build_initial_worklist ();
+
+ /* Now process the worklist, exploring the <point, state> graph. */
+ eg.process_worklist ();
+
+ if (flag_dump_analyzer_exploded_graph)
+ {
+ auto_client_timevar tv ("writing .eg.dot");
+ char *filename
+ = concat (dump_base_name, ".eg.dot", NULL);
+ exploded_graph::dump_args_t args (eg);
+ root_cluster c;
+ eg.dump_dot (filename, &c, args);
+ free (filename);
+ }
+
+ /* Now emit any saved diagnostics. */
+ eg.get_diagnostic_manager ().emit_saved_diagnostics (eg);
+
+ eg.dump_exploded_nodes ();
+
+ eg.log_stats ();
+
+ if (flag_dump_analyzer_callgraph)
+ dump_callgraph (sg, &eg);
+
+ delete purge_map;
+}
+
+/* External entrypoint to the analysis "engine".
+ Set up any dumps, then call impl_run_checkers. */
+
+void
+run_checkers ()
+{
+ auto_client_timevar tv ("run_checkers");
+
+ /* Handle -fdump-analyzer and -fdump-analyzer-stderr. */
+ FILE *dump_fout = NULL;
+ /* Track if we're responsible for closing dump_fout. */
+ bool owns_dump_fout = false;
+ if (flag_dump_analyzer_stderr)
+ dump_fout = stderr;
+ else if (flag_dump_analyzer)
+ {
+ char *dump_filename = concat (dump_base_name, ".analyzer.txt", NULL);
+ dump_fout = fopen (dump_filename, "w");
+ free (dump_filename);
+ if (dump_fout)
+ owns_dump_fout = true;
+ }
+
+ {
+ log_user the_logger (NULL);
+ if (dump_fout)
+ the_logger.set_logger (new logger (dump_fout, 0, 0,
+ *global_dc->printer));
+ LOG_SCOPE (the_logger.get_logger ());
+
+ impl_run_checkers (the_logger.get_logger ());
+
+ /* end of lifetime of the_logger (so that dump file is closed after the
+ various dtors run). */
+ }
+
+ if (owns_dump_fout)
+ fclose (dump_fout);
+}
diff --git a/gcc/analyzer/engine.h b/gcc/analyzer/engine.h
new file mode 100644
index 0000000..b9b7e0b
--- /dev/null
+++ b/gcc/analyzer/engine.h
@@ -0,0 +1,26 @@
+/* The analysis "engine".
+ Copyright (C) 2019 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_ANALYZER_ENGINE_H
+#define GCC_ANALYZER_ENGINE_H
+
+extern void run_checkers ();
+
+#endif /* GCC_ANALYZER_ENGINE_H */
--
1.8.5.3