1 /* Classes for modeling the state of memory.
2 Copyright (C) 2019-2022 Free Software Foundation, Inc.
3 Contributed by David Malcolm <dmalcolm@redhat.com>.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 #ifndef GCC_ANALYZER_REGION_MODEL_H
22 #define GCC_ANALYZER_REGION_MODEL_H
24 /* Implementation of the region-based ternary model described in:
25 "A Memory Model for Static Analysis of C Programs"
26 (Zhongxing Xu, Ted Kremenek, and Jian Zhang)
27 http://lcs.ios.ac.cn/~xuzb/canalyze/memmodel.pdf */
30 #include "analyzer/svalue.h"
31 #include "analyzer/region.h"
32 #include "analyzer/known-function-manager.h"
33 #include "analyzer/region-model-manager.h"
34 #include "analyzer/pending-diagnostic.h"
40 extern void add_path_var (path_var pv, hash &hstate);
41 } // namespace inchash
49 one_way_id_map (int num_ids);
50 void put (T src, T dst);
51 T get_dst_for_src (T src) const;
52 void dump_to_pp (pretty_printer *pp) const;
54 void update (T *) const;
57 auto_vec<T> m_src_to_dst;
60 /* class one_way_id_map. */
62 /* one_way_id_map's ctor, which populates the map with dummy null values. */
65 inline one_way_id_map<T>::one_way_id_map (int num_svalues)
66 : m_src_to_dst (num_svalues)
68 for (int i = 0; i < num_svalues; i++)
69 m_src_to_dst.quick_push (T::null ());
72 /* Record that SRC is to be mapped to DST. */
76 one_way_id_map<T>::put (T src, T dst)
78 m_src_to_dst[src.as_int ()] = dst;
81 /* Get the new value for SRC within the map. */
85 one_way_id_map<T>::get_dst_for_src (T src) const
89 return m_src_to_dst[src.as_int ()];
92 /* Dump this map to PP. */
96 one_way_id_map<T>::dump_to_pp (pretty_printer *pp) const
98 pp_string (pp, "src to dst: {");
101 FOR_EACH_VEC_ELT (m_src_to_dst, i, dst)
104 pp_string (pp, ", ");
105 T src (T::from_int (i));
107 pp_string (pp, " -> ");
114 /* Dump this map to stderr. */
116 template <typename T>
117 DEBUG_FUNCTION inline void
118 one_way_id_map<T>::dump () const
121 pp.buffer->stream = stderr;
126 /* Update *ID from the old value to its new value in this map. */
128 template <typename T>
130 one_way_id_map<T>::update (T *id) const
132 *id = get_dst_for_src (*id);
135 /* A mapping from region to svalue for use when tracking state. */
137 class region_to_value_map
140 typedef hash_map<const region *, const svalue *> hash_map_t;
141 typedef hash_map_t::iterator iterator;
143 region_to_value_map () : m_hash_map () {}
144 region_to_value_map (const region_to_value_map &other)
145 : m_hash_map (other.m_hash_map) {}
146 region_to_value_map &operator= (const region_to_value_map &other);
148 bool operator== (const region_to_value_map &other) const;
149 bool operator!= (const region_to_value_map &other) const
151 return !(*this == other);
154 iterator begin () const { return m_hash_map.begin (); }
155 iterator end () const { return m_hash_map.end (); }
157 const svalue * const *get (const region *reg) const
159 return const_cast <hash_map_t &> (m_hash_map).get (reg);
161 void put (const region *reg, const svalue *sval)
163 m_hash_map.put (reg, sval);
165 void remove (const region *reg)
167 m_hash_map.remove (reg);
170 bool is_empty () const { return m_hash_map.is_empty (); }
172 void dump_to_pp (pretty_printer *pp, bool simple, bool multiline) const;
173 void dump (bool simple) const;
175 bool can_merge_with_p (const region_to_value_map &other,
176 region_to_value_map *out) const;
178 void purge_state_involving (const svalue *sval);
181 hash_map_t m_hash_map;
184 /* Various operations delete information from a region_model.
186 This struct tracks how many of each kind of entity were purged (e.g.
187 for selftests, and for debugging). */
194 m_num_equiv_classes (0),
195 m_num_constraints (0),
196 m_num_bounded_ranges_constraints (0),
197 m_num_client_items (0)
202 int m_num_equiv_classes;
203 int m_num_constraints;
204 int m_num_bounded_ranges_constraints;
205 int m_num_client_items;
208 /* A base class for visiting regions and svalues, with do-nothing
209 base implementations of the per-subclass vfuncs. */
214 virtual void visit_region_svalue (const region_svalue *) {}
215 virtual void visit_constant_svalue (const constant_svalue *) {}
216 virtual void visit_unknown_svalue (const unknown_svalue *) {}
217 virtual void visit_poisoned_svalue (const poisoned_svalue *) {}
218 virtual void visit_setjmp_svalue (const setjmp_svalue *) {}
219 virtual void visit_initial_svalue (const initial_svalue *) {}
220 virtual void visit_unaryop_svalue (const unaryop_svalue *) {}
221 virtual void visit_binop_svalue (const binop_svalue *) {}
222 virtual void visit_sub_svalue (const sub_svalue *) {}
223 virtual void visit_repeated_svalue (const repeated_svalue *) {}
224 virtual void visit_bits_within_svalue (const bits_within_svalue *) {}
225 virtual void visit_unmergeable_svalue (const unmergeable_svalue *) {}
226 virtual void visit_placeholder_svalue (const placeholder_svalue *) {}
227 virtual void visit_widening_svalue (const widening_svalue *) {}
228 virtual void visit_compound_svalue (const compound_svalue *) {}
229 virtual void visit_conjured_svalue (const conjured_svalue *) {}
230 virtual void visit_asm_output_svalue (const asm_output_svalue *) {}
231 virtual void visit_const_fn_result_svalue (const const_fn_result_svalue *) {}
233 virtual void visit_region (const region *) {}
236 struct append_regions_cb_data;
238 /* Helper class for handling calls to functions with known behavior.
239 Implemented in region-model-impl-calls.c. */
244 call_details (const gcall *call, region_model *model,
245 region_model_context *ctxt);
247 region_model *get_model () const { return m_model; }
248 region_model_manager *get_manager () const;
249 region_model_context *get_ctxt () const { return m_ctxt; }
250 logger *get_logger () const;
252 uncertainty_t *get_uncertainty () const;
253 tree get_lhs_type () const { return m_lhs_type; }
254 const region *get_lhs_region () const { return m_lhs_region; }
256 bool maybe_set_lhs (const svalue *result) const;
258 unsigned num_args () const;
260 const gcall *get_call_stmt () const { return m_call; }
262 tree get_arg_tree (unsigned idx) const;
263 tree get_arg_type (unsigned idx) const;
264 const svalue *get_arg_svalue (unsigned idx) const;
265 const char *get_arg_string_literal (unsigned idx) const;
267 tree get_fndecl_for_call () const;
269 void dump_to_pp (pretty_printer *pp, bool simple) const;
270 void dump (bool simple) const;
272 const svalue *get_or_create_conjured_svalue (const region *) const;
276 region_model *m_model;
277 region_model_context *m_ctxt;
279 const region *m_lhs_region;
282 /* A region_model encapsulates a representation of the state of memory, with
283 a tree of regions, along with their associated values.
284 The representation is graph-like because values can be pointers to
287 - a constraint_manager, capturing relationships between the values, and
288 - dynamic extents, mapping dynamically-allocated regions to svalues (their
294 typedef region_to_value_map dynamic_extents_t;
296 region_model (region_model_manager *mgr);
297 region_model (const region_model &other);
299 region_model &operator= (const region_model &other);
301 bool operator== (const region_model &other) const;
302 bool operator!= (const region_model &other) const
304 return !(*this == other);
307 hashval_t hash () const;
309 void print (pretty_printer *pp) const;
311 void dump_to_pp (pretty_printer *pp, bool simple, bool multiline) const;
312 void dump (FILE *fp, bool simple, bool multiline) const;
313 void dump (bool simple) const;
317 void validate () const;
319 void canonicalize ();
320 bool canonicalized_p () const;
323 on_stmt_pre (const gimple *stmt,
324 bool *out_terminate_path,
325 bool *out_unknown_side_effects,
326 region_model_context *ctxt);
328 void on_assignment (const gassign *stmt, region_model_context *ctxt);
329 const svalue *get_gassign_result (const gassign *assign,
330 region_model_context *ctxt);
331 void on_asm_stmt (const gasm *asm_stmt, region_model_context *ctxt);
332 bool on_call_pre (const gcall *stmt, region_model_context *ctxt,
333 bool *out_terminate_path);
334 void on_call_post (const gcall *stmt,
335 bool unknown_side_effects,
336 region_model_context *ctxt);
338 void purge_state_involving (const svalue *sval, region_model_context *ctxt);
340 /* Specific handling for on_call_pre. */
341 void impl_call_alloca (const call_details &cd);
342 void impl_call_analyzer_describe (const gcall *call,
343 region_model_context *ctxt);
344 void impl_call_analyzer_dump_capacity (const gcall *call,
345 region_model_context *ctxt);
346 void impl_call_analyzer_dump_escaped (const gcall *call);
347 void impl_call_analyzer_eval (const gcall *call,
348 region_model_context *ctxt);
349 void impl_call_analyzer_get_unknown_ptr (const call_details &cd);
350 void impl_call_builtin_expect (const call_details &cd);
351 void impl_call_calloc (const call_details &cd);
352 void impl_call_errno_location (const call_details &cd);
353 bool impl_call_error (const call_details &cd, unsigned min_args,
354 bool *out_terminate_path);
355 void impl_call_fgets (const call_details &cd);
356 void impl_call_fread (const call_details &cd);
357 void impl_call_free (const call_details &cd);
358 void impl_call_malloc (const call_details &cd);
359 void impl_call_memcpy (const call_details &cd);
360 void impl_call_memset (const call_details &cd);
361 void impl_call_pipe (const call_details &cd);
362 void impl_call_putenv (const call_details &cd);
363 void impl_call_realloc (const call_details &cd);
364 void impl_call_strchr (const call_details &cd);
365 void impl_call_strcpy (const call_details &cd);
366 void impl_call_strlen (const call_details &cd);
367 void impl_call_operator_new (const call_details &cd);
368 void impl_call_operator_delete (const call_details &cd);
369 void impl_deallocation_call (const call_details &cd);
371 /* Implemented in varargs.cc. */
372 void impl_call_va_start (const call_details &cd);
373 void impl_call_va_copy (const call_details &cd);
374 void impl_call_va_arg (const call_details &cd);
375 void impl_call_va_end (const call_details &cd);
377 const svalue *maybe_get_copy_bounds (const region *src_reg,
378 const svalue *num_bytes_sval);
379 void update_for_int_cst_return (const call_details &cd,
382 void update_for_zero_return (const call_details &cd,
384 void update_for_nonzero_return (const call_details &cd);
386 void handle_unrecognized_call (const gcall *call,
387 region_model_context *ctxt);
388 void get_reachable_svalues (svalue_set *out,
389 const svalue *extra_sval,
390 const uncertainty_t *uncertainty);
392 void on_return (const greturn *stmt, region_model_context *ctxt);
393 void on_setjmp (const gcall *stmt, const exploded_node *enode,
394 region_model_context *ctxt);
395 void on_longjmp (const gcall *longjmp_call, const gcall *setjmp_call,
396 int setjmp_stack_depth, region_model_context *ctxt);
398 void update_for_phis (const supernode *snode,
399 const cfg_superedge *last_cfg_superedge,
400 region_model_context *ctxt);
402 void handle_phi (const gphi *phi, tree lhs, tree rhs,
403 const region_model &old_state,
404 region_model_context *ctxt);
406 bool maybe_update_for_edge (const superedge &edge,
407 const gimple *last_stmt,
408 region_model_context *ctxt,
409 rejected_constraint **out);
411 void update_for_gcall (const gcall *call_stmt,
412 region_model_context *ctxt,
413 function *callee = NULL);
415 void update_for_return_gcall (const gcall *call_stmt,
416 region_model_context *ctxt);
418 const region *push_frame (function *fun, const vec<const svalue *> *arg_sids,
419 region_model_context *ctxt);
420 const frame_region *get_current_frame () const { return m_current_frame; }
421 function * get_current_function () const;
422 void pop_frame (tree result_lvalue,
423 const svalue **out_result,
424 region_model_context *ctxt);
425 int get_stack_depth () const;
426 const frame_region *get_frame_at_index (int index) const;
428 const region *get_lvalue (path_var pv, region_model_context *ctxt) const;
429 const region *get_lvalue (tree expr, region_model_context *ctxt) const;
430 const svalue *get_rvalue (path_var pv, region_model_context *ctxt) const;
431 const svalue *get_rvalue (tree expr, region_model_context *ctxt) const;
433 const region *deref_rvalue (const svalue *ptr_sval, tree ptr_tree,
434 region_model_context *ctxt) const;
436 const svalue *get_rvalue_for_bits (tree type,
438 const bit_range &bits,
439 region_model_context *ctxt) const;
441 void set_value (const region *lhs_reg, const svalue *rhs_sval,
442 region_model_context *ctxt);
443 void set_value (tree lhs, tree rhs, region_model_context *ctxt);
444 void clobber_region (const region *reg);
445 void purge_region (const region *reg);
446 void fill_region (const region *reg, const svalue *sval);
447 void zero_fill_region (const region *reg);
448 void mark_region_as_unknown (const region *reg, uncertainty_t *uncertainty);
450 tristate eval_condition (const svalue *lhs,
452 const svalue *rhs) const;
453 tristate eval_condition_without_cm (const svalue *lhs,
455 const svalue *rhs) const;
456 tristate compare_initial_and_pointer (const initial_svalue *init,
457 const region_svalue *ptr) const;
458 tristate symbolic_greater_than (const binop_svalue *a,
459 const svalue *b) const;
460 tristate structural_equality (const svalue *a, const svalue *b) const;
461 tristate eval_condition (tree lhs,
464 region_model_context *ctxt);
465 bool add_constraint (tree lhs, enum tree_code op, tree rhs,
466 region_model_context *ctxt);
467 bool add_constraint (tree lhs, enum tree_code op, tree rhs,
468 region_model_context *ctxt,
469 rejected_constraint **out);
471 const region *create_region_for_heap_alloc (const svalue *size_in_bytes,
472 region_model_context *ctxt);
473 const region *create_region_for_alloca (const svalue *size_in_bytes,
474 region_model_context *ctxt);
476 tree get_representative_tree (const svalue *sval) const;
477 tree get_representative_tree (const region *reg) const;
479 get_representative_path_var (const svalue *sval,
480 svalue_set *visited) const;
482 get_representative_path_var (const region *reg,
483 svalue_set *visited) const;
486 constraint_manager *get_constraints ()
488 return m_constraints;
491 store *get_store () { return &m_store; }
492 const store *get_store () const { return &m_store; }
494 const dynamic_extents_t &
495 get_dynamic_extents () const
497 return m_dynamic_extents;
499 const svalue *get_dynamic_extents (const region *reg) const;
500 void set_dynamic_extents (const region *reg,
501 const svalue *size_in_bytes,
502 region_model_context *ctxt);
503 void unset_dynamic_extents (const region *reg);
505 region_model_manager *get_manager () const { return m_mgr; }
506 bounded_ranges_manager *get_range_manager () const
508 return m_mgr->get_range_manager ();
511 void unbind_region_and_descendents (const region *reg,
512 enum poison_kind pkind);
514 bool can_merge_with_p (const region_model &other_model,
515 const program_point &point,
516 region_model *out_model,
517 const extrinsic_state *ext_state = NULL,
518 const program_state *state_a = NULL,
519 const program_state *state_b = NULL) const;
521 tree get_fndecl_for_call (const gcall *call,
522 region_model_context *ctxt);
524 void get_regions_for_current_frame (auto_vec<const decl_region *> *out) const;
525 static void append_regions_cb (const region *base_reg,
526 struct append_regions_cb_data *data);
528 const svalue *get_store_value (const region *reg,
529 region_model_context *ctxt) const;
531 bool region_exists_p (const region *reg) const;
533 void loop_replay_fixup (const region_model *dst_state);
535 const svalue *get_capacity (const region *reg) const;
537 const svalue *get_string_size (const svalue *sval) const;
538 const svalue *get_string_size (const region *reg) const;
540 bool replay_call_summary (call_summary_replay &r,
541 const region_model &summary);
543 void maybe_complain_about_infoleak (const region *dst_reg,
544 const svalue *copied_sval,
545 const region *src_reg,
546 region_model_context *ctxt);
548 void set_errno (const call_details &cd);
550 /* Implemented in sm-fd.cc */
551 void mark_as_valid_fd (const svalue *sval, region_model_context *ctxt);
553 /* Implemented in sm-malloc.cc */
554 void on_realloc_with_move (const call_details &cd,
555 const svalue *old_ptr_sval,
556 const svalue *new_ptr_sval);
558 /* Implemented in sm-taint.cc. */
559 void mark_as_tainted (const svalue *sval,
560 region_model_context *ctxt);
563 const region *get_lvalue_1 (path_var pv, region_model_context *ctxt) const;
564 const svalue *get_rvalue_1 (path_var pv, region_model_context *ctxt) const;
567 get_representative_path_var_1 (const svalue *sval,
568 svalue_set *visited) const;
570 get_representative_path_var_1 (const region *reg,
571 svalue_set *visited) const;
573 const known_function *get_known_function (tree fndecl) const;
575 bool add_constraint (const svalue *lhs,
578 region_model_context *ctxt);
579 bool add_constraints_from_binop (const svalue *outer_lhs,
580 enum tree_code outer_op,
581 const svalue *outer_rhs,
583 region_model_context *ctxt);
585 void update_for_call_superedge (const call_superedge &call_edge,
586 region_model_context *ctxt);
587 void update_for_return_superedge (const return_superedge &return_edge,
588 region_model_context *ctxt);
589 bool apply_constraints_for_gcond (const cfg_superedge &edge,
590 const gcond *cond_stmt,
591 region_model_context *ctxt,
592 rejected_constraint **out);
593 bool apply_constraints_for_gswitch (const switch_cfg_superedge &edge,
594 const gswitch *switch_stmt,
595 region_model_context *ctxt,
596 rejected_constraint **out);
597 bool apply_constraints_for_exception (const gimple *last_stmt,
598 region_model_context *ctxt,
599 rejected_constraint **out);
601 int poison_any_pointers_to_descendents (const region *reg,
602 enum poison_kind pkind);
604 void on_top_level_param (tree param, region_model_context *ctxt);
606 bool called_from_main_p () const;
607 const svalue *get_initial_value_for_global (const region *reg) const;
609 const svalue *check_for_poison (const svalue *sval,
611 region_model_context *ctxt) const;
612 const region * get_region_for_poisoned_expr (tree expr) const;
614 void check_dynamic_size_for_taint (enum memory_space mem_space,
615 const svalue *size_in_bytes,
616 region_model_context *ctxt) const;
617 void check_dynamic_size_for_floats (const svalue *size_in_bytes,
618 region_model_context *ctxt) const;
620 void check_region_for_taint (const region *reg,
621 enum access_direction dir,
622 region_model_context *ctxt) const;
624 void check_for_writable_region (const region* dest_reg,
625 region_model_context *ctxt) const;
626 void check_region_access (const region *reg,
627 enum access_direction dir,
628 region_model_context *ctxt) const;
629 void check_region_for_write (const region *dest_reg,
630 region_model_context *ctxt) const;
631 void check_region_for_read (const region *src_reg,
632 region_model_context *ctxt) const;
633 void check_region_size (const region *lhs_reg, const svalue *rhs_sval,
634 region_model_context *ctxt) const;
635 void check_symbolic_bounds (const region *base_reg,
636 const svalue *sym_byte_offset,
637 const svalue *num_bytes_sval,
638 const svalue *capacity,
639 enum access_direction dir,
640 region_model_context *ctxt) const;
641 void check_region_bounds (const region *reg, enum access_direction dir,
642 region_model_context *ctxt) const;
644 void check_call_args (const call_details &cd) const;
645 void check_external_function_for_access_attr (const gcall *call,
647 region_model_context *ctxt) const;
649 /* Storing this here to avoid passing it around everywhere. */
650 region_model_manager *const m_mgr;
654 constraint_manager *m_constraints; // TODO: embed, rather than dynalloc?
656 const frame_region *m_current_frame;
658 /* Map from base region to size in bytes, for tracking the sizes of
659 dynamically-allocated regions.
660 This is part of the region_model rather than the region to allow for
661 memory regions to be resized (e.g. by realloc). */
662 dynamic_extents_t m_dynamic_extents;
665 /* Some region_model activity could lead to warnings (e.g. attempts to use an
666 uninitialized value). This abstract base class encapsulates an interface
667 for the region model to use when emitting such warnings.
669 Having this as an abstract base class allows us to support the various
670 operations needed by program_state in the analyzer within region_model,
671 whilst keeping them somewhat modularized. */
673 class region_model_context
676 /* Hook for clients to store pending diagnostics.
677 Return true if the diagnostic was stored, or false if it was deleted. */
678 virtual bool warn (std::unique_ptr<pending_diagnostic> d) = 0;
680 /* Hook for clients to add a note to the last previously stored
681 pending diagnostic. */
682 virtual void add_note (std::unique_ptr<pending_note> pn) = 0;
684 /* Hook for clients to be notified when an SVAL that was reachable
685 in a previous state is no longer live, so that clients can emit warnings
687 virtual void on_svalue_leak (const svalue *sval) = 0;
689 /* Hook for clients to be notified when the set of explicitly live
690 svalues changes, so that they can purge state relating to dead
692 virtual void on_liveness_change (const svalue_set &live_svalues,
693 const region_model *model) = 0;
695 virtual logger *get_logger () = 0;
697 /* Hook for clients to be notified when the condition
698 "LHS OP RHS" is added to the region model.
699 This exists so that state machines can detect tests on edges,
700 and use them to trigger sm-state transitions (e.g. transitions due
701 to ptrs becoming known to be NULL or non-NULL, rather than just
703 virtual void on_condition (const svalue *lhs,
705 const svalue *rhs) = 0;
707 /* Hook for clients to be notified when the condition that
708 SVAL is within RANGES is added to the region model.
709 Similar to on_condition, but for use when handling switch statements.
710 RANGES is non-empty. */
711 virtual void on_bounded_ranges (const svalue &sval,
712 const bounded_ranges &ranges) = 0;
714 /* Hooks for clients to be notified when an unknown change happens
715 to SVAL (in response to a call to an unknown function). */
716 virtual void on_unknown_change (const svalue *sval, bool is_mutable) = 0;
718 /* Hooks for clients to be notified when a phi node is handled,
719 where RHS is the pertinent argument. */
720 virtual void on_phi (const gphi *phi, tree rhs) = 0;
722 /* Hooks for clients to be notified when the region model doesn't
723 know how to handle the tree code of T at LOC. */
724 virtual void on_unexpected_tree_code (tree t,
725 const dump_location_t &loc) = 0;
727 /* Hook for clients to be notified when a function_decl escapes. */
728 virtual void on_escaped_function (tree fndecl) = 0;
730 virtual uncertainty_t *get_uncertainty () = 0;
732 /* Hook for clients to purge state involving SVAL. */
733 virtual void purge_state_involving (const svalue *sval) = 0;
735 /* Hook for clients to split state with a non-standard path. */
736 virtual void bifurcate (std::unique_ptr<custom_edge_info> info) = 0;
738 /* Hook for clients to terminate the standard path. */
739 virtual void terminate_path () = 0;
741 virtual const extrinsic_state *get_ext_state () const = 0;
743 /* Hook for clients to access the a specific state machine in
744 any underlying program_state. */
745 virtual bool get_state_map_by_name (const char *name,
746 sm_state_map **out_smap,
747 const state_machine **out_sm,
748 unsigned *out_sm_idx) = 0;
750 /* Precanned ways for clients to access specific state machines. */
751 bool get_fd_map (sm_state_map **out_smap,
752 const state_machine **out_sm,
753 unsigned *out_sm_idx)
755 return get_state_map_by_name ("file-descriptor", out_smap, out_sm,
758 bool get_malloc_map (sm_state_map **out_smap,
759 const state_machine **out_sm,
760 unsigned *out_sm_idx)
762 return get_state_map_by_name ("malloc", out_smap, out_sm, out_sm_idx);
764 bool get_taint_map (sm_state_map **out_smap,
765 const state_machine **out_sm,
766 unsigned *out_sm_idx)
768 return get_state_map_by_name ("taint", out_smap, out_sm, out_sm_idx);
771 /* Get the current statement, if any. */
772 virtual const gimple *get_stmt () const = 0;
775 /* A "do nothing" subclass of region_model_context. */
777 class noop_region_model_context : public region_model_context
780 bool warn (std::unique_ptr<pending_diagnostic>) override { return false; }
781 void add_note (std::unique_ptr<pending_note>) override;
782 void on_svalue_leak (const svalue *) override {}
783 void on_liveness_change (const svalue_set &,
784 const region_model *) override {}
785 logger *get_logger () override { return NULL; }
786 void on_condition (const svalue *lhs ATTRIBUTE_UNUSED,
787 enum tree_code op ATTRIBUTE_UNUSED,
788 const svalue *rhs ATTRIBUTE_UNUSED) override
791 void on_bounded_ranges (const svalue &,
792 const bounded_ranges &) override
795 void on_unknown_change (const svalue *sval ATTRIBUTE_UNUSED,
796 bool is_mutable ATTRIBUTE_UNUSED) override
799 void on_phi (const gphi *phi ATTRIBUTE_UNUSED,
800 tree rhs ATTRIBUTE_UNUSED) override
803 void on_unexpected_tree_code (tree, const dump_location_t &) override {}
805 void on_escaped_function (tree) override {}
807 uncertainty_t *get_uncertainty () override { return NULL; }
809 void purge_state_involving (const svalue *sval ATTRIBUTE_UNUSED) override {}
811 void bifurcate (std::unique_ptr<custom_edge_info> info) override;
812 void terminate_path () override;
814 const extrinsic_state *get_ext_state () const override { return NULL; }
816 bool get_state_map_by_name (const char *,
818 const state_machine **,
824 const gimple *get_stmt () const override { return NULL; }
827 /* A subclass of region_model_context for determining if operations fail
828 e.g. "can we generate a region for the lvalue of EXPR?". */
830 class tentative_region_model_context : public noop_region_model_context
833 tentative_region_model_context () : m_num_unexpected_codes (0) {}
835 void on_unexpected_tree_code (tree, const dump_location_t &)
838 m_num_unexpected_codes++;
841 bool had_errors_p () const { return m_num_unexpected_codes > 0; }
844 int m_num_unexpected_codes;
847 /* Subclass of region_model_context that wraps another context, allowing
848 for extra code to be added to the various hooks. */
850 class region_model_context_decorator : public region_model_context
853 bool warn (std::unique_ptr<pending_diagnostic> d) override
855 return m_inner->warn (std::move (d));
858 void add_note (std::unique_ptr<pending_note> pn) override
860 m_inner->add_note (std::move (pn));
863 void on_svalue_leak (const svalue *sval) override
865 m_inner->on_svalue_leak (sval);
868 void on_liveness_change (const svalue_set &live_svalues,
869 const region_model *model) override
871 m_inner->on_liveness_change (live_svalues, model);
874 logger *get_logger () override
876 return m_inner->get_logger ();
879 void on_condition (const svalue *lhs,
881 const svalue *rhs) override
883 m_inner->on_condition (lhs, op, rhs);
886 void on_bounded_ranges (const svalue &sval,
887 const bounded_ranges &ranges) override
889 m_inner->on_bounded_ranges (sval, ranges);
892 void on_unknown_change (const svalue *sval, bool is_mutable) override
894 m_inner->on_unknown_change (sval, is_mutable);
897 void on_phi (const gphi *phi, tree rhs) override
899 m_inner->on_phi (phi, rhs);
902 void on_unexpected_tree_code (tree t,
903 const dump_location_t &loc) override
905 m_inner->on_unexpected_tree_code (t, loc);
908 void on_escaped_function (tree fndecl) override
910 m_inner->on_escaped_function (fndecl);
913 uncertainty_t *get_uncertainty () override
915 return m_inner->get_uncertainty ();
918 void purge_state_involving (const svalue *sval) override
920 m_inner->purge_state_involving (sval);
923 void bifurcate (std::unique_ptr<custom_edge_info> info) override
925 m_inner->bifurcate (std::move (info));
928 void terminate_path () override
930 m_inner->terminate_path ();
933 const extrinsic_state *get_ext_state () const override
935 return m_inner->get_ext_state ();
938 bool get_state_map_by_name (const char *name,
939 sm_state_map **out_smap,
940 const state_machine **out_sm,
941 unsigned *out_sm_idx) override
943 return m_inner->get_state_map_by_name (name, out_smap, out_sm, out_sm_idx);
946 const gimple *get_stmt () const override
948 return m_inner->get_stmt ();
952 region_model_context_decorator (region_model_context *inner)
955 gcc_assert (m_inner);
958 region_model_context *m_inner;
961 /* Subclass of region_model_context_decorator that adds a note
962 when saving diagnostics. */
964 class note_adding_context : public region_model_context_decorator
967 bool warn (std::unique_ptr<pending_diagnostic> d) override
969 if (m_inner->warn (std::move (d)))
971 add_note (make_note ());
978 /* Hook to make the new note. */
979 virtual std::unique_ptr<pending_note> make_note () = 0;
982 note_adding_context (region_model_context *inner)
983 : region_model_context_decorator (inner)
988 /* A bundle of data for use when attempting to merge two region_model
989 instances to make a third. */
993 model_merger (const region_model *model_a,
994 const region_model *model_b,
995 const program_point &point,
996 region_model *merged_model,
997 const extrinsic_state *ext_state,
998 const program_state *state_a,
999 const program_state *state_b)
1000 : m_model_a (model_a), m_model_b (model_b),
1002 m_merged_model (merged_model),
1003 m_ext_state (ext_state),
1004 m_state_a (state_a), m_state_b (state_b)
1008 void dump_to_pp (pretty_printer *pp, bool simple) const;
1009 void dump (FILE *fp, bool simple) const;
1010 void dump (bool simple) const;
1012 region_model_manager *get_manager () const
1014 return m_model_a->get_manager ();
1017 bool mergeable_svalue_p (const svalue *) const;
1018 const function_point &get_function_point () const
1020 return m_point.get_function_point ();
1023 const region_model *m_model_a;
1024 const region_model *m_model_b;
1025 const program_point &m_point;
1026 region_model *m_merged_model;
1028 const extrinsic_state *m_ext_state;
1029 const program_state *m_state_a;
1030 const program_state *m_state_b;
1033 /* A record that can (optionally) be written out when
1034 region_model::add_constraint fails. */
1036 class rejected_constraint
1039 virtual ~rejected_constraint () {}
1040 virtual void dump_to_pp (pretty_printer *pp) const = 0;
1042 const region_model &get_model () const { return m_model; }
1045 rejected_constraint (const region_model &model)
1049 region_model m_model;
1052 class rejected_op_constraint : public rejected_constraint
1055 rejected_op_constraint (const region_model &model,
1056 tree lhs, enum tree_code op, tree rhs)
1057 : rejected_constraint (model),
1058 m_lhs (lhs), m_op (op), m_rhs (rhs)
1061 void dump_to_pp (pretty_printer *pp) const final override;
1064 enum tree_code m_op;
1068 class rejected_ranges_constraint : public rejected_constraint
1071 rejected_ranges_constraint (const region_model &model,
1072 tree expr, const bounded_ranges *ranges)
1073 : rejected_constraint (model),
1074 m_expr (expr), m_ranges (ranges)
1077 void dump_to_pp (pretty_printer *pp) const final override;
1081 const bounded_ranges *m_ranges;
1084 /* A bundle of state. */
1089 engine (const supergraph *sg = NULL, logger *logger = NULL);
1090 const supergraph *get_supergraph () { return m_sg; }
1091 region_model_manager *get_model_manager () { return &m_mgr; }
1092 known_function_manager *get_known_function_manager ()
1094 return m_mgr.get_known_function_manager ();
1097 void log_stats (logger *logger) const;
1100 const supergraph *m_sg;
1101 region_model_manager m_mgr;
1106 extern void debug (const region_model &rmodel);
1112 namespace selftest {
1114 using namespace ::selftest;
1116 /* An implementation of region_model_context for use in selftests, which
1117 stores any pending_diagnostic instances passed to it. */
1119 class test_region_model_context : public noop_region_model_context
1122 bool warn (std::unique_ptr<pending_diagnostic> d) final override
1124 m_diagnostics.safe_push (d.release ());
1128 unsigned get_num_diagnostics () const { return m_diagnostics.length (); }
1130 void on_unexpected_tree_code (tree t, const dump_location_t &)
1133 internal_error ("unhandled tree code: %qs",
1134 get_tree_code_name (TREE_CODE (t)));
1138 /* Implicitly delete any diagnostics in the dtor. */
1139 auto_delete_vec<pending_diagnostic> m_diagnostics;
1142 /* Attempt to add the constraint (LHS OP RHS) to MODEL.
1143 Verify that MODEL remains satisfiable. */
1145 #define ADD_SAT_CONSTRAINT(MODEL, LHS, OP, RHS) \
1146 SELFTEST_BEGIN_STMT \
1147 bool sat = (MODEL).add_constraint (LHS, OP, RHS, NULL); \
1148 ASSERT_TRUE (sat); \
1151 /* Attempt to add the constraint (LHS OP RHS) to MODEL.
1152 Verify that the result is not satisfiable. */
1154 #define ADD_UNSAT_CONSTRAINT(MODEL, LHS, OP, RHS) \
1155 SELFTEST_BEGIN_STMT \
1156 bool sat = (MODEL).add_constraint (LHS, OP, RHS, NULL); \
1157 ASSERT_FALSE (sat); \
1160 /* Implementation detail of the ASSERT_CONDITION_* macros. */
1162 void assert_condition (const location &loc,
1163 region_model &model,
1164 const svalue *lhs, tree_code op, const svalue *rhs,
1167 void assert_condition (const location &loc,
1168 region_model &model,
1169 tree lhs, tree_code op, tree rhs,
1172 /* Assert that REGION_MODEL evaluates the condition "LHS OP RHS"
1175 #define ASSERT_CONDITION_TRUE(REGION_MODEL, LHS, OP, RHS) \
1176 SELFTEST_BEGIN_STMT \
1177 assert_condition (SELFTEST_LOCATION, REGION_MODEL, LHS, OP, RHS, \
1178 tristate (tristate::TS_TRUE)); \
1181 /* Assert that REGION_MODEL evaluates the condition "LHS OP RHS"
1184 #define ASSERT_CONDITION_FALSE(REGION_MODEL, LHS, OP, RHS) \
1185 SELFTEST_BEGIN_STMT \
1186 assert_condition (SELFTEST_LOCATION, REGION_MODEL, LHS, OP, RHS, \
1187 tristate (tristate::TS_FALSE)); \
1190 /* Assert that REGION_MODEL evaluates the condition "LHS OP RHS"
1193 #define ASSERT_CONDITION_UNKNOWN(REGION_MODEL, LHS, OP, RHS) \
1194 SELFTEST_BEGIN_STMT \
1195 assert_condition (SELFTEST_LOCATION, REGION_MODEL, LHS, OP, RHS, \
1196 tristate (tristate::TS_UNKNOWN)); \
1199 } /* end of namespace selftest. */
1201 #endif /* #if CHECKING_P */
1205 #endif /* GCC_ANALYZER_REGION_MODEL_H */