analyzer: rewrite of region and value-handling

analyzer: rewrite of region and value-handling

This large patch reimplements how the analyzer tracks regions and
values.

Elimination of region_id and svalue_id
**************************************

The patch eliminates region_id and svalue_id in favor of simply
using pointers.  I'd hoped that the ID classes would make it easier
to compare states, avoiding having to compare long hexadecimal addresses
in favor of small integers.  Unfortunately it added lots of complexity,
with the need to remap IDs when comparing or purging states, and the
need to "canonicalize" when comparing states.

Various "state explosion" bugs in the old implementation were due to
failures in canonicalization, where two states that ought to be equal
were non-equal due to differences in ID ordering.  I spent a lot of
time trying to fix canonicalization bugs, and there always seemed to
be one more bug.  By eliminating IDs in this new implementation, lots
of tricky canonicalization goes away and no ID remapping should be
needed; almost all of the old validation code becomes redundant.
There's still some canonicalization in the new implementation, mostly
in constraint_manager, but much less than before.

Ownership of regions and svalues
********************************

In the old implementation, each region_model had its own copies of
regions and svalues, so there was heap bloat and churn as lots of
little objects were cloned when copying program_state instances.  In the
new implementation the regions and svalues are immutable and are shared
thoughout the analysis, rather than being per region_model.  They are
owned by a manager class, and are effectively singletons.  Region and
svalue instances can now be compared by pointer rather than by comparing
their fields (the manager class takes care of uniqueness).

This is a huge simplification, and (I hope) will avoid lots
of heap churn as states are copied; all mutable state from regions and
svalues is now stored in a "store" class in the region_model.

Changes to the meaning of a "region"
************************************

Region subclasses no longer represent internal structure, but instead
represent how the regions are reached.  So e.g. a global "struct coord
c;" is now a decl_region, rather than a struct_region.

In the old implementation, the values for each region were stored in the
region instances, but in the new implementation the regions are immutable.
Memory is now modeled in a new "store" class: a mapping from keys to
svalues, where the keys are both concrete bit-offsets from the start of
a "base region", and "symbolic" keys (thus hopefully making unions,
casts, aliasing etc easier to deal with).  So e.g. for assignments to
the fields of a struct, it records the mapping from bit-offsets of e.g.
field to the values; if that memory is cast to another type and written
to, the appropriate clobbering of the bound values can happen.

The concept of "what the current stack is" moves from the regions to
being a field within the region_model ("m_current_frame").

Bugs fixed by this patch
************************

PR analyzer/93032 (missing leak diagnostic for zlib/contrib/minizip/mztools.c)
PR analyzer/93938 (ICE in analyzer)
PR analyzer/94011 (ICE in analyzer)
PR analyzer/94099 (ICE in analyzer)
PR analyzer/94399 (leak false positive with __attribute__((cleanup())))
PR analyzer/94458 (leak false positive)
PR analyzer/94503 (ICE on C++ return-value-optimization)
PR analyzer/94640 (leak false positive)
PR analyzer/94688 (ICE in analyzer)
PR analyzer/94689 ("arrays of functions are not meaningful" error)
PR analyzer/94839 (leak false positive)
PR analyzer/95026 (leak false positive)
PR analyzer/95042 (ICE merging const and non-const C++ object instances)
PR analyzer/95240 (leak false positive)

gcc/ChangeLog:
	* Makefile.in (ANALYZER_OBJS): Add analyzer/region.o,
	analyzer/region-model-impl-calls.o,
	analyzer/region-model-manager.o,
	analyzer/region-model-reachability.o, analyzer/store.o, and
	analyzer/svalue.o.
	* doc/analyzer.texi: Update for changes to analyzer
	implementation.
	* tristate.h (tristate::get_value): New accessor.

gcc/analyzer/ChangeLog:
	* analyzer-logging.cc: Ignore "-Wformat-diag".
	(logger::enter_scope): Use inc_indent in both overloads.
	(logger::exit_scope): Use dec_indent.
	* analyzer-logging.h (logger::inc_indent): New.
	(logger::dec_indent): New.
	* analyzer-selftests.cc (run_analyzer_selftests): Call
	analyzer_store_cc_tests.
	* analyzer-selftests.h (analyzer_store_cc_tests): New decl.
	* analyzer.cc (get_stmt_location): New function.
	* analyzer.h (class initial_svalue): New forward decl.
	(class unaryop_svalue): New forward decl.
	(class binop_svalue): New forward decl.
	(class sub_svalue): New forward decl.
	(class unmergeable_svalue): New forward decl.
	(class placeholder_svalue): New forward decl.
	(class widening_svalue): New forward decl.
	(class compound_svalue): New forward decl.
	(class conjured_svalue): New forward decl.
	(svalue_set): New typedef.
	(class map_region): Delete.
	(class array_region): Delete.
	(class frame_region): New forward decl.
	(class function_region): New forward decl.
	(class label_region): New forward decl.
	(class decl_region): New forward decl.
	(class element_region): New forward decl.
	(class offset_region): New forward decl.
	(class cast_region): New forward decl.
	(class field_region): New forward decl.
	(class string_region): New forward decl.
	(class region_model_manager): New forward decl.
	(class store_manager): New forward decl.
	(class store): New forward decl.
	(class call_details): New forward decl.
	(struct svalue_id_merger_mapping): Delete.
	(struct canonicalization): Delete.
	(class function_point): New forward decl.
	(class engine): New forward decl.
	(dump_tree): New function decl.
	(print_quoted_type): New function decl.
	(readability_comparator): New function decl.
	(tree_cmp): New function decl.
	(class path_var): Move here from region-model.h
	(bit_offset_t, bit_size_t, byte_size_t): New typedefs.
	(class region_offset): New class.
	(get_stmt_location): New decl.
	(struct member_function_hash_traits): New struct.
	(class consolidation_map): New class.
	Ignore "-Wformat-diag".
	* analyzer.opt (-param=analyzer-max-svalue-depth=): New param.
	(-param=analyzer-max-enodes-for-full-dump=): New param.
	* call-string.cc: Ignore -Wformat-diag.
	* checker-path.cc: Move includes of "analyzer/call-string.h" and
	"analyzer/program-point.h" to before "analyzer/region-model.h",
	and also include "analyzer/store.h" before it.
	(state_change_event::state_change_event): Replace "tree var" param
	with "const svalue *sval".  Convert "origin" param from tree to
	"const svalue *".
	(state_change_event::get_desc): Call get_representative_tree to
	convert the var and origin from const svalue * to tree.  Use
	svalue::get_desc rather than %qE when describing state changes.
	(checker_path::add_final_event): Use get_stmt_location.
	* checker-path.h (state_change_event::state_change_event): Port
	from tree to const svalue *.
	(state_change_event::get_lvalue): Delete.
	(state_change_event::get_dest_function): New.
	(state_change_event::m_var): Replace with...
	(state_change_event::m_sval): ...this.
	(state_change_event::m_origin): Convert from tree to
	const svalue *.
	* constraint-manager.cc: Include "analyzer/call-string.h",
	"analyzer/program-point.h", and "analyzer/store.h" before
	"analyzer/region-model.h".
	(struct bound, struct range): Move to constraint-manager.h.
	(compare_constants): New function.
	(range::dump): Rename to...
	(range::dump_to_pp): ...this.  Support NULL constants.
	(range::dump): Reintroduce for dumping to stderr.
	(range::constrained_to_single_element): Return result, rather than
	writing to *OUT.
	(range::eval_condition): New.
	(range::below_lower_bound): New.
	(range::above_upper_bound): New.
	(equiv_class::equiv_class): Port from svalue_id to const svalue *.
	(equiv_class::print): Likewise.
	(equiv_class::hash): Likewise.
	(equiv_class::operator==): Port from svalue_id to const svalue *.
	(equiv_class::add): Port from svalue_id to const svalue *. Drop
	"cm" param.
	(equiv_class::del): Port from svalue_id to const svalue *.
	(equiv_class::get_representative): Likewise.
	(equiv_class::remap_svalue_ids): Delete.
	(svalue_id_cmp_by_id): Rename to...
	(svalue_cmp_by_ptr): ...this, porting from svalue_id to
	const svalue *.
	(equiv_class::canonicalize): Update qsort comparator.
	(constraint::implied_by): New.
	(constraint_manager::constraint_manager): Copy m_mgr in copy ctor.
	(constraint_manager::dump_to_pp): Add "multiline" param
	(constraint_manager::dump): Pass "true" for "multiline".
	(constraint_manager::add_constraint): Port from svalue_id to
	const svalue *.  Split out second part into...
	(constraint_manager::add_unknown_constraint): ...this new
	function.  Remove self-constraints when merging equivalence
	classes.
	(constraint_manager::add_constraint_internal): Remove constraints
	that would be implied by the new constraint.  Port from svalue_id
	to const svalue *.
	(constraint_manager::get_equiv_class_by_sid): Rename to...
	(constraint_manager::get_equiv_class_by_svalue): ...this, porting
	from svalue_id to const svalue *.
	(constraint_manager::get_or_add_equiv_class): Port from svalue_id
	to const svalue *.
	(constraint_manager::eval_condition): Make const.  Call
	compare_constants and return early if it provides a known result.
	(constraint_manager::get_ec_bounds): New.
	(constraint_manager::eval_condition): New overloads.  Make
	existing one const, and use compare_constants.
	(constraint_manager::purge): Convert "p" param to a template
	rather that an abstract base class.  Port from svalue_id to
	const svalue *.
	(class dead_svalue_purger): New class.
	(constraint_manager::remap_svalue_ids): Delete.
	(constraint_manager::on_liveness_change): New.
	(equiv_class_cmp): Port from svalue_id to const svalue *.
	(constraint_manager::canonicalize): Likewise.  Combine with
	purging of redundant equivalence classes and constraints.
	(class cleaned_constraint_manager): Delete.
	(class merger_fact_visitor): Make "m_cm_b" const.  Add "m_merger"
	field.
	(merger_fact_visitor::fact): Port from svalue_id to const svalue *.
	Add special case for widening.
	(constraint_manager::merge): Port from svalue_id to const svalue *.
	(constraint_manager::clean_merger_input): Delete.
	(constraint_manager::for_each_fact): Port from svalue_id to
	const svalue *.
	(constraint_manager::validate): Likewise.
	(selftest::test_constraint_conditions): Provide a
	region_model_manager when creating region_model instances.
	Add test for self-equality not creating equivalence classes.
	(selftest::test_transitivity): Provide a region_model_manager when
	creating region_model instances.  Verify that EC-merging happens
	when constraints are implied.
	(selftest::test_constant_comparisons):  Provide a
	region_model_manager when creating region_model instances.
	(selftest::test_constraint_impl): Likewise.  Remove over-specified
	assertions.
	(selftest::test_equality): Provide a region_model_manager when
	creating region_model instances.
	(selftest::test_many_constants): Likewise.  Provide a
	program_point when testing merging.
	(selftest::run_constraint_manager_tests): Move call to
	test_constant_comparisons to outside the transitivity guard.
	* constraint-manager.h (struct bound): Move here from
	constraint-manager.cc.
	(struct range): Likewise.
	(struct::eval_condition): New decl.
	(struct::below_lower_bound): New decl.
	(struct::above_upper_bound): New decl.
	(equiv_class::add): Port from svalue_id to const svalue *.
	(equiv_class::del): Likewise.
	(equiv_class::get_representative): Likewise.
	(equiv_class::remap_svalue_ids): Drop.
	(equiv_class::m_cst_sid): Convert to..
	(equiv_class::m_cst_sval): ...this.
	(equiv_class::m_vars): Port from svalue_id to const svalue *.
	(constraint::bool implied_by): New decl.
	(fact_visitor::on_fact): Port from svalue_id to const svalue *.
	(constraint_manager::constraint_manager): Add mgr param.
	(constraint_manager::clone): Delete.
	(constraint_manager::maybe_get_constant): Delete.
	(constraint_manager::get_sid_for_constant): Delete.
	(constraint_manager::get_num_svalues): Delete.
	(constraint_manager::dump_to_pp): Add "multiline" param.
	(constraint_manager::get_equiv_class): Port from svalue_id to
	const svalue *.
	(constraint_manager::add_constraint):  Likewise.
	(constraint_manager::get_equiv_class_by_sid): Rename to...
	(constraint_manager::get_equiv_class_by_svalue): ...this, porting
	from svalue_id to const svalue *.
	(constraint_manager::add_unknown_constraint): New decl.
	(constraint_manager::get_or_add_equiv_class): Port from svalue_id
	to const svalue *.
	(constraint_manager::eval_condition): Likewise.  Add overloads.
	(constraint_manager::get_ec_bounds): New decl.
	(constraint_manager::purge): Convert to template.
	(constraint_manager::remap_svalue_ids): Delete.
	(constraint_manager::on_liveness_change): New decl.
	(constraint_manager::canonicalize): Drop param.
	(constraint_manager::clean_merger_input): Delete.
	(constraint_manager::m_mgr): New field.
	* diagnostic-manager.cc: Move includes of
	"analyzer/call-string.h" and "analyzer/program-point.h" to before
	"analyzer/region-model.h", and also include "analyzer/store.h"
	before it.
	(saved_diagnostic::saved_diagnostic): Add "sval" param.
	(diagnostic_manager::diagnostic_manager): Add engine param.
	(diagnostic_manager::add_diagnostic): Add "sval" param, passing it
	to saved_diagnostic ctor.  Update overload to pass NULL for it.
	(dedupe_winners::dedupe_winners): Add engine param.
	(dedupe_winners::add): Add "eg" param.  Pass m_engine to
	feasible_p.
	(dedupe_winner::m_engine): New field.
	(diagnostic_manager::emit_saved_diagnostics): Pass engine to
	dedupe_winners.  Pass &eg when adding candidates.  Pass svalue
	rather than tree to prune_path.  Use get_stmt_location to get
	primary location of diagnostic.
	(diagnostic_manager::emit_saved_diagnostic): Likewise.
	(get_any_origin): Drop.
	(state_change_event_creator::on_global_state_change): Pass NULL
	const svalue * rather than NULL_TREE trees to state_change_event
	ctor.
	(state_change_event_creator::on_state_change): Port from tree and
	svalue_id to const svalue *.
	(for_each_state_change): Port from svalue_id to const svalue *.
	(struct null_assignment_sm_context): New.
	(diagnostic_manager::add_events_for_eedge):  Add state change
	events for assignment to NULL.
	(diagnostic_manager::prune_path): Update param from tree to
	const svalue *.
	(diagnostic_manager::prune_for_sm_diagnostic): Port from tracking
	by tree to by const svalue *.
	* diagnostic-manager.h (saved_diagnostic::saved_diagnostic): Add sval
	param.
	(saved_diagnostic::m_sval): New field.
	(diagnostic_manager::diagnostic_manager): Add engine param.
	(diagnostic_manager::get_engine): New.
	(diagnostic_manager::add_diagnostic): Add "sval" param.
	(diagnostic_manager::prune_path): Likewise.
	(diagnostic_manager::prune_for_sm_diagnostic): New overload.
	(diagnostic_manager::m_eng): New field.
	* engine.cc: Move includes of "analyzer/call-string.h" and
	"analyzer/program-point.h" to before "analyzer/region-model.h",
	and also include "analyzer/store.h" before it.
	(impl_region_model_context::impl_region_model_context): Update for
	removal of m_change field.
	(impl_region_model_context::remap_svalue_ids): Delete.
	(impl_region_model_context::on_svalue_leak): New.
	(impl_region_model_context::on_svalue_purge): Delete.
	(impl_region_model_context::on_liveness_change): New.
	(impl_region_model_context::on_unknown_change): Update param
	from svalue_id to const svalue *.  Add is_mutable param.
	(setjmp_svalue::compare_fields): Delete.
	(setjmp_svalue::accept): New.
	(setjmp_svalue::add_to_hash): Delete.
	(setjmp_svalue::dump_to_pp): New.
	(setjmp_svalue::print_details): Delete.
	(impl_sm_context::impl_sm_context): Drop "change" param.
	(impl_sm_context::get_fndecl_for_call): Drop "m_change".
	(impl_sm_context::on_transition): Drop ATTRIBUTE_UNUSED from
	"stmt" param.  Drop m_change.  Port from svalue_id to
	const svalue *.
	(impl_sm_context::warn_for_state): Drop m_change.  Port from
	svalue_id to const svalue *.
	(impl_sm_context::get_readable_tree): Rename to...
	(impl_sm_context::get_diagnostic_tree): ...this.  Port from
	svalue_id to const svalue *.
	(impl_sm_context::is_zero_assignment): New.
	(impl_sm_context::m_change): Delete field.
	(leak_stmt_finder::find_stmt): Handle m_var being NULL.
	(readability):  Increase penalty for MEM_REF.  For SSA_NAMEs,
	slightly favor the underlying var over the SSA name.  Heavily
	penalize temporaries.  Handle RESULT_DECL.
	(readability_comparator): Make non-static.  Consider stack depths.
	(impl_region_model_context::on_state_leak): Convert from svalue_id
	to const svalue *, updating for region_model changes.  Use
	id_equal.
	(impl_region_model_context::on_inherited_svalue): Delete.
	(impl_region_model_context::on_cast): Delete.
	(impl_region_model_context::on_condition):  Drop m_change.
	(impl_region_model_context::on_phi): Likewise.
	(impl_region_model_context::on_unexpected_tree_code): Handle t
	being NULL.
	(point_and_state::validate): Update stack checking for
	region_model changes.
	(eg_traits::dump_args_t::show_enode_details_p): New.
	(exploded_node::exploded_node): Initialize m_num_processed_stmts.
	(exploded_node::get_processed_stmt): New function.
	(exploded_node::get_dot_fillcolor): Add more colors.
	(exploded_node::dump_dot): Guard the printing of the point and
	state with show_enode_details_p.  Print the processed stmts for
	this enode after the initial state.
	(exploded_node::dump_to_pp): Pass true for new multiline param
	of program_state::dump_to_pp.
	(exploded_node::on_stmt): Drop "change" param.  Log the stmt.
	Set input_location.  Implement __analyzer_describe.  Update
	implementation of __analyzer_dump and __analyzer_eval.
	Remove purging of sm-state for unknown fncalls from here.
	(exploded_node::on_edge): Drop "change" param.
	(exploded_node::on_longjmp): Port from region_id/svalue_id to
	const region */const svalue *.  Call program_state::detect_leaks.
	Drop state_change.
	(exploded_node::detect_leaks): Update for changes to region_model.
	Call program_state::detect_leaks.
	(exploded_edge::exploded_edge): Drop ext_state and change params.
	(exploded_edge::dump_dot): "args" is no longer used.  Drop dumping
	of m_change.
	(exploded_graph::exploded_graph): Pass engine to
	m_diagnostic_manager ctor.  Use program_point::origin.
	(exploded_graph::add_function_entry):  Drop ctxt.  Use
	program_state::push_frame.  Drop state_change.
	(exploded_graph::get_or_create_node): Drop "change" param.  Add
	"enode_for_diag" param.  Update dumping calls for API changes.
	Pass point to can_merge_with_p.  Show enode indices
	within -Wanalyzer-too-complex diagnostic for hitting the per-point
	limit.
	(exploded_graph::add_edge): Drop "change" param.  Log which nodes
	are being connected.  Update for changes to exploded_edge ctor.
	(exploded_graph::get_per_program_point_data): New.
	(exploded_graph::process_worklist): Pass point to
	can_merge_with_p.  Drop state_change.  Update dumping call for API
	change.
	(exploded_graph::process_node):  Drop state_change.  Split the
	node in-place if an sm-state-change occurs.  Update
	m_num_processed_stmts.  Update dumping calls for API change.
	(exploded_graph::log_stats): Call engine::log_stats.
	(exploded_graph::dump_states_for_supernode): Update dumping
	call.
	(exploded_path::feasible_p): Add "eng" and "eg" params.
	Rename "i" to "end_idx".  Pass the manager to the region_model
	ctor.  Update for every processed stmt in the enode, not just the
	first.  Keep track of which snodes have been visited, and call
	loop_replay_fixup when revisiting one.
	(enode_label::get_text): Update dump call for new param.
	(exploded_graph::dump_exploded_nodes): Likewise.
	(exploded_graph::get_node_by_index): New.
	(impl_run_checkers): Create engine instance and pass its address
	to extrinsic_state ctor.
	* exploded-graph.h
	(impl_region_model_context::impl_region_model_context): Drop
	"change" params.
	(impl_region_model_context::void remap_svalue_ids): Delete.
	(impl_region_model_context::on_svalue_purge): Delete.
	(impl_region_model_context::on_svalue_leak): New.
	(impl_region_model_context::on_liveness_change): New.
	(impl_region_model_context::on_state_leak): Update signature.
	(impl_region_model_context::on_inherited_svalue): Delete.
	(impl_region_model_context::on_cast): Delete.
	(impl_region_model_context::on_unknown_change): Update signature.
	(impl_region_model_context::m_change): Delete.
	(eg_traits::dump_args_t::show_enode_details_p): New.
	(exploded_node::on_stmt): Drop "change" param.
	(exploded_node::on_edge): Likewise.
	(exploded_node::get_processed_stmt): New decl.
	(exploded_node::m_num_processed_stmts): New field.
	(exploded_edge::exploded_edge): Drop ext_state and change params.
	(exploded_edge::m_change): Delete.
	(exploded_graph::get_engine): New accessor.
	(exploded_graph::get_or_create_node): Drop "change" param.  Add
	"enode_for_diag" param.
	(exploded_graph::add_edge): Drop "change" param.
	(exploded_graph::get_per_program_point_data): New decl.
	(exploded_graph::get_node_by_index): New decl.
	(exploded_path::feasible_p): Add "eng" and "eg" params.
	* program-point.cc: Include "analyzer/store.h" before including
	"analyzer/region-model.h".
	(function_point::function_point): Move here from
	program-point.h.
	(function_point::get_function): Likewise.
	(function_point::from_function_entry): Likewise.
	(function_point::before_supernode): Likewise.
	(function_point::next_stmt): New function.
	* program-point.h (function_point::function_point): Move
	implementation from here to program-point.cc.
	(function_point::get_function): Likewise.
	(function_point::from_function_entry): Likewise.
	(function_point::before_supernode): Likewise.
	(function_point::next_stmt): New decl.
	(program_point::operator!=): New.
	(program_point::origin): New.
	(program_point::next_stmt): New.
	(program_point::m_function_point): Make non-const.
	* program-state.cc: Move includes of "analyzer/call-string.h" and
	"analyzer/program-point.h" to before "analyzer/region-model.h",
	and also include "analyzer/store.h" before it.
	(extrinsic_state::get_model_manager): New.
	(sm_state_map::sm_state_map): Pass in sm and sm_idx to ctor,
	rather than pass the around.
	(sm_state_map::clone_with_remapping): Delete.
	(sm_state_map::print): Remove "sm" param in favor of "m_sm".  Add
	"simple" and "multiline" params and support multiline vs single
	line dumping.
	(sm_state_map::dump): Remove "sm" param in favor of "m_sm".  Add
	"simple" param.
	(sm_state_map::hash): Port from svalue_id to const svalue *.
	(sm_state_map::operator==): Likewise.
	(sm_state_map::get_state): Likewise.  Call canonicalize_svalue on
	input.  Handle inheritance of sm-state.  Call get_default_state.
	(sm_state_map::get_origin): Port from svalue_id to const svalue *.
	(sm_state_map::set_state): Likewise.  Pass in ext_state.  Reject
	attempts to set state on UNKNOWN.
	(sm_state_map::impl_set_state): Port from svalue_id to
	const svalue *.  Pass in ext_state.  Call canonicalize_svalue on
	input.
	(sm_state_map::purge_for_unknown_fncall): Delete.
	(sm_state_map::on_svalue_leak): New.
	(sm_state_map::remap_svalue_ids): Delete.
	(sm_state_map::on_liveness_change): New.
	(sm_state_map::on_unknown_change): Reimplement.
	(sm_state_map::on_svalue_purge): Delete.
	(sm_state_map::on_inherited_svalue): Delete.
	(sm_state_map::on_cast): Delete.
	(sm_state_map::validate): Delete.
	(sm_state_map::canonicalize_svalue): New.
	(program_state::program_state): Update to pass manager to
	region_model's ctor.  Constify num_states and pass state machine
	and index to sm_state_map ctor.
	(program_state::print): Update for changes to dump API.
	(program_state::dump_to_pp): Ignore the summarize param.  Add
	"multiline" param.
	(program_state::dump_to_file): Add "multiline" param.
	(program_state::dump): Pass "true" for new "multiline" param.
	(program_state::push_frame): New.
	(program_state::on_edge): Drop "change" param.  Call
	program_state::detect_leaks.
	(program_state::prune_for_point): Add enode_for_diag param.
	Reimplement based on store class.  Call detect_leaks
	(program_state::remap_svalue_ids): Delete.
	(program_state::get_representative_tree): Port from svalue_id to
	const svalue *.
	(program_state::can_merge_with_p): Add "point" param.  Add early
	reject for sm-differences.  Drop id remapping.
	(program_state::validate): Drop region model and sm_state_map
	validation.
	(state_change::sm_change::dump): Delete.
	(state_change::sm_change::remap_svalue_ids): Delete.
	(state_change::sm_change::on_svalue_purge): Delete.
	(log_set_of_svalues): New.
	(state_change::sm_change::validate): Delete.
	(state_change::state_change): Delete.
	(state_change::add_sm_change): Delete.
	(state_change::affects_p): Delete.
	(state_change::dump): Delete.
	(state_change::remap_svalue_ids): Delete.
	(state_change::on_svalue_purge): Delete.
	(state_change::validate): Delete.
	(selftest::assert_dump_eq): Delete.
	(ASSERT_DUMP_EQ): Delete.
	(selftest::test_sm_state_map): Update for changes to region_model
	and sm_state_map, porting from svalue_id to const svalue *.
	(selftest::test_program_state_dumping): Likewise.  Drop test of
	dumping, renaming to...
	(selftest::test_program_state_1): ...this.
	(selftest::test_program_state_dumping_2): Likewise, renaming to...
	(selftest::test_program_state_2): ...this.
	(selftest::test_program_state_merging): Update for changes to
	region_model.
	(selftest::test_program_state_merging_2): Likewise.
	(selftest::analyzer_program_state_cc_tests): Update for renamed
	tests.
	* program-state.h (extrinsic_state::extrinsic_state): Add logger
	and engine params.
	(extrinsic_state::get_logger): New accessor.
	(extrinsic_state::get_engine): New accessor.
	(extrinsic_state::get_model_manager): New accessor.
	(extrinsic_state::m_logger): New field.
	(extrinsic_state::m_engine): New field.
	(struct default_hash_traits<svalue_id>): Delete.
	(pod_hash_traits<svalue_id>::hash): Delete.
	(pod_hash_traits<svalue_id>::equal): Delete.
	(pod_hash_traits<svalue_id>::mark_deleted): Delete.
	(pod_hash_traits<svalue_id>::mark_empty): Delete.
	(pod_hash_traits<svalue_id>::is_deleted): Delete.
	(pod_hash_traits<svalue_id>::is_empty): Delete.
	(sm_state_map::entry_t::entry_t): Port from svalue_id to
	const svalue *.
	(sm_state_map::entry_t::m_origin): Likewise.
	(sm_state_map::map_t): Likewise.
	(sm_state_map::sm_state_map): Add state_machine and index params.
	(sm_state_map::clone_with_remapping): Delete.
	(sm_state_map::print):  Drop sm param; add simple and multiline
	params.
	(sm_state_map::dump): Drop sm param; add simple param.
	(sm_state_map::get_state): Port from svalue_id to const svalue *.
	Add ext_state param.
	(sm_state_map::get_origin): Likewise.
	(sm_state_map::set_state): Likewise.
	(sm_state_map::impl_set_state): Likewise.
	(sm_state_map::purge_for_unknown_fncall): Delete.
	(sm_state_map::remap_svalue_ids): Delete.
	(sm_state_map::on_svalue_purge): Delete.
	(sm_state_map::on_svalue_leak): New.
	(sm_state_map::on_liveness_change): New.
	(sm_state_map::on_inherited_svalue): Delete.
	(sm_state_map::on_cast): Delete.
	(sm_state_map::validate): Delete.
	(sm_state_map::on_unknown_change): Port from svalue_id to
	const svalue *.  Add is_mutable and ext_state params.
	(sm_state_map::canonicalize_svalue): New.
	(sm_state_map::m_sm): New field.
	(sm_state_map::m_sm_idx): New field.
	(program_state::operator=): Delete.
	(program_state::dump_to_pp): Drop "summarize" param, adding
	"simple" and "multiline".
	(program_state::dump_to_file): Likewise.
	(program_state::dump): Rename "summarize" to "simple".
	(program_state::push_frame): New.
	(program_state::get_current_function): New.
	(program_state::on_edge): Drop "change" param.
	(program_state::prune_for_point): Likewise.  Add enode_for_diag
	param.
	(program_state::remap_svalue_ids): Delete.
	(program_state::get_representative_tree): Port from svalue_id to
	const svalue *.
	(program_state::can_purge_p): Likewise.  Pass ext_state to get_state.
	(program_state::can_merge_with_p): Add point param.
	(program_state::detect_leaks): New.
	(state_change_visitor::on_state_change): Port from tree and
	svalue_id to a pair of const svalue *.
	(class state_change): Delete.
	* region.cc: New file.
	* region-model-impl-calls.cc: New file.
	* region-model-manager.cc: New file.
	* region-model-reachability.cc: New file.
	* region-model-reachability.h: New file.
	* region-model.cc: Include "analyzer/call-string.h",
	"analyzer/program-point.h", and "analyzer/store.h" before
	"analyzer/region-model.h".  Include
	"analyzer/region-model-reachability.h".
	(dump_tree): Make non-static.
	(dump_quoted_tree): Make non-static.
	(print_quoted_type): Make non-static.
	(path_var::dump): Delete.
	(dump_separator): Delete.
	(class impl_constraint_manager): Delete.
	(svalue_id::print): Delete.
	(svalue_id::dump_node_name_to_pp): Delete.
	(svalue_id::validate): Delete.
	(region_id::print): Delete.
	(region_id::dump_node_name_to_pp): Delete.
	(region_id::validate): Delete.
	(region_id_set::region_id_set): Delete.
	(svalue_id_set::svalue_id_set): Delete.
	(svalue::operator==): Delete.
	(svalue::hash): Delete.
	(svalue::print): Delete.
	(svalue::dump_dot_to_pp): Delete.
	(svalue::remap_region_ids): Delete.
	(svalue::walk_for_canonicalization): Delete.
	(svalue::get_child_sid): Delete.
	(svalue::maybe_get_constant): Delete.
	(region_svalue::compare_fields): Delete.
	(region_svalue::add_to_hash): Delete.
	(region_svalue::print_details): Delete.
	(region_svalue::dump_dot_to_pp): Delete.
	(region_svalue::remap_region_ids): Delete.
	(region_svalue::merge_values): Delete.
	(region_svalue::walk_for_canonicalization): Delete.
	(region_svalue::eval_condition): Delete.
	(constant_svalue::compare_fields): Delete.
	(constant_svalue::add_to_hash): Delete.
	(constant_svalue::merge_values): Delete.
	(constant_svalue::eval_condition): Move to svalue.cc.
	(constant_svalue::print_details): Delete.
	(constant_svalue::get_child_sid): Delete.
	(unknown_svalue::compare_fields): Delete.
	(unknown_svalue::add_to_hash): Delete.
	(unknown_svalue::print_details): Delete.
	(poison_kind_to_str): Move to svalue.cc.
	(poisoned_svalue::compare_fields): Delete.
	(poisoned_svalue::add_to_hash): Delete.
	(poisoned_svalue::print_details): Delete.
	(region_kind_to_str): Move to region.cc and reimplement.
	(region::operator==): Delete.
	(region::get_parent_region): Delete.
	(region::set_value): Delete.
	(region::become_active_view): Delete.
	(region::deactivate_any_active_view): Delete.
	(region::deactivate_view): Delete.
	(region::get_value): Delete.
	(region::get_inherited_child_sid): Delete.
	(region_model::copy_region): Delete.
	(region_model::copy_struct_region): Delete.
	(region_model::copy_union_region): Delete.
	(region_model::copy_array_region): Delete.
	(region::hash): Delete.
	(region::print): Delete.
	(region::dump_dot_to_pp): Delete.
	(region::dump_to_pp): Delete.
	(region::dump_child_label): Delete.
	(region::validate): Delete.
	(region::remap_svalue_ids): Delete.
	(region::remap_region_ids): Delete.
	(region::add_view): Delete.
	(region::get_view): Delete.
	(region::region): Move to region.cc.
	(region::add_to_hash): Delete.
	(region::print_fields): Delete.
	(region::non_null_p): Delete.
	(primitive_region::clone): Delete.
	(primitive_region::walk_for_canonicalization): Delete.
	(map_region::map_region): Delete.
	(map_region::compare_fields): Delete.
	(map_region::print_fields): Delete.
	(map_region::validate): Delete.
	(map_region::dump_dot_to_pp): Delete.
	(map_region::dump_child_label): Delete.
	(map_region::get_or_create): Delete.
	(map_region::get): Delete.
	(map_region::add_to_hash): Delete.
	(map_region::remap_region_ids): Delete.
	(map_region::unbind): Delete.
	(map_region::get_tree_for_child_region): Delete.
	(map_region::get_tree_for_child_region): Delete.
	(tree_cmp): Move to region.cc.
	(map_region::can_merge_p): Delete.
	(map_region::walk_for_canonicalization): Delete.
	(map_region::get_value_by_name): Delete.
	(struct_or_union_region::valid_key_p): Delete.
	(struct_or_union_region::compare_fields): Delete.
	(struct_region::clone): Delete.
	(struct_region::compare_fields): Delete.
	(union_region::clone): Delete.
	(union_region::compare_fields): Delete.
	(frame_region::compare_fields): Delete.
	(frame_region::clone): Delete.
	(frame_region::valid_key_p): Delete.
	(frame_region::print_fields): Delete.
	(frame_region::add_to_hash): Delete.
	(globals_region::compare_fields): Delete.
	(globals_region::clone): Delete.
	(globals_region::valid_key_p): Delete.
	(code_region::compare_fields): Delete.
	(code_region::clone): Delete.
	(code_region::valid_key_p): Delete.
	(array_region::array_region): Delete.
	(array_region::get_element): Delete.
	(array_region::clone): Delete.
	(array_region::compare_fields): Delete.
	(array_region::print_fields): Delete.
	(array_region::validate): Delete.
	(array_region::dump_dot_to_pp): Delete.
	(array_region::dump_child_label): Delete.
	(array_region::get_or_create): Delete.
	(array_region::get): Delete.
	(array_region::add_to_hash): Delete.
	(array_region::remap_region_ids): Delete.
	(array_region::get_key_for_child_region): Delete.
	(array_region::key_cmp): Delete.
	(array_region::walk_for_canonicalization): Delete.
	(array_region::key_from_constant): Delete.
	(array_region::constant_from_key): Delete.
	(function_region::compare_fields): Delete.
	(function_region::clone): Delete.
	(function_region::valid_key_p): Delete.
	(stack_region::stack_region): Delete.
	(stack_region::compare_fields): Delete.
	(stack_region::clone): Delete.
	(stack_region::print_fields): Delete.
	(stack_region::dump_child_label): Delete.
	(stack_region::validate): Delete.
	(stack_region::push_frame): Delete.
	(stack_region::get_current_frame_id): Delete.
	(stack_region::pop_frame): Delete.
	(stack_region::add_to_hash): Delete.
	(stack_region::remap_region_ids): Delete.
	(stack_region::can_merge_p): Delete.
	(stack_region::walk_for_canonicalization): Delete.
	(stack_region::get_value_by_name): Delete.
	(heap_region::heap_region): Delete.
	(heap_region::compare_fields): Delete.
	(heap_region::clone): Delete.
	(heap_region::walk_for_canonicalization): Delete.
	(root_region::root_region): Delete.
	(root_region::compare_fields): Delete.
	(root_region::clone): Delete.
	(root_region::print_fields): Delete.
	(root_region::validate): Delete.
	(root_region::dump_child_label): Delete.
	(root_region::push_frame): Delete.
	(root_region::get_current_frame_id): Delete.
	(root_region::pop_frame): Delete.
	(root_region::ensure_stack_region): Delete.
	(root_region::get_stack_region): Delete.
	(root_region::ensure_globals_region): Delete.
	(root_region::get_code_region): Delete.
	(root_region::ensure_code_region): Delete.
	(root_region::get_globals_region): Delete.
	(root_region::ensure_heap_region): Delete.
	(root_region::get_heap_region): Delete.
	(root_region::remap_region_ids): Delete.
	(root_region::can_merge_p): Delete.
	(root_region::add_to_hash): Delete.
	(root_region::walk_for_canonicalization): Delete.
	(root_region::get_value_by_name): Delete.
	(symbolic_region::symbolic_region): Delete.
	(symbolic_region::compare_fields): Delete.
	(symbolic_region::clone): Delete.
	(symbolic_region::walk_for_canonicalization): Delete.
	(symbolic_region::print_fields): Delete.
	(region_model::region_model): Add region_model_manager * param.
	Reimplement in terms of store, dropping impl_constraint_manager
	subclass.
	(region_model::operator=): Reimplement in terms of store
	(region_model::operator==): Likewise.
	(region_model::hash): Likewise.
	(region_model::print): Delete.
	(region_model::print_svalue): Delete.
	(region_model::dump_dot_to_pp): Delete.
	(region_model::dump_dot_to_file): Delete.
	(region_model::dump_dot): Delete.
	(region_model::dump_to_pp): Replace "summarize" param with
	"simple" and "multiline".  Port to store-based implementation.
	(region_model::dump): Replace "summarize" param with "simple" and
	"multiline".
	(dump_vec_of_tree): Delete.
	(region_model::dump_summary_of_rep_path_vars): Delete.
	(region_model::validate): Delete.
	(svalue_id_cmp_by_constant_svalue_model): Delete.
	(svalue_id_cmp_by_constant_svalue): Delete.
	(region_model::canonicalize): Drop "ctxt" param.  Reimplement in
	terms of store and constraints.
	(region_model::canonicalized_p): Remove NULL arg to canonicalize.
	(region_model::loop_replay_fixup): New.
	(poisoned_value_diagnostic::emit): Tweak wording of warnings.
	(region_model::check_for_poison): Delete.
	(region_model::get_gassign_result): New.
	(region_model::on_assignment): Port to store-based implementation.
	(region_model::on_call_pre): Delete calls to check_for_poison.
	Move implementations to region-model-impl-calls.c and port to
	store-based implementation.
	(region_model::on_call_post): Likewise.
	(class reachable_regions): Move to region-model-reachability.h/cc
	and port to store-based implementation.
	(region_model::handle_unrecognized_call): Port to store-based
	implementation.
	(region_model::get_reachable_svalues): New.
	(region_model::on_setjmp): Port to store-based implementation.
	(region_model::on_longjmp): Likewise.
	(region_model::handle_phi): Drop is_back_edge param and the logic
	using it.
	(region_model::get_lvalue_1): Port from region_id to const region *.
	(region_model::make_region_for_unexpected_tree_code): Delete.
	(assert_compat_types): If the check fails, use internal_error to
	show the types.
	(region_model::get_lvalue): Port from region_id to const region *.
	(region_model::get_rvalue_1): Port from svalue_id to const svalue *.
	(region_model::get_rvalue): Likewise.
	(region_model::get_or_create_ptr_svalue): Delete.
	(region_model::get_or_create_constant_svalue): Delete.
	(region_model::get_svalue_for_fndecl): Delete.
	(region_model::get_region_for_fndecl): Delete.
	(region_model::get_svalue_for_label): Delete.
	(region_model::get_region_for_label): Delete.
	(build_cast): Delete.
	(region_model::maybe_cast_1): Delete.
	(region_model::maybe_cast): Delete.
	(region_model::get_field_region): Delete.
	(region_model::get_store_value): New.
	(region_model::region_exists_p): New.
	(region_model::deref_rvalue): Port from svalue_id to const svalue *.
	(region_model::set_value): Likewise.
	(region_model::clobber_region): New.
	(region_model::purge_region): New.
	(region_model::zero_fill_region): New.
	(region_model::mark_region_as_unknown): New.
	(region_model::eval_condition): Port from svalue_id to
	const svalue *.
	(region_model::eval_condition_without_cm): Likewise.
	(region_model::compare_initial_and_pointer): New.
	(region_model::add_constraint): Port from svalue_id to
	const svalue *.
	(region_model::maybe_get_constant): Delete.
	(region_model::get_representative_path_var): New.
	(region_model::add_new_malloc_region): Delete.
	(region_model::get_representative_tree): Port to const svalue *.
	(region_model::get_representative_path_var): Port to
	const region *.
	(region_model::get_path_vars_for_svalue): Delete.
	(region_model::set_to_new_unknown_value): Delete.
	(region_model::update_for_phis): Don't pass is_back_edge to handle_phi.
	(region_model::update_for_call_superedge): Port from svalue_id to
	const svalue *.
	(region_model::update_for_return_superedge): Port to store-based
	implementation.
	(region_model::update_for_call_summary): Replace
	set_to_new_unknown_value with mark_region_as_unknown.
	(region_model::get_root_region): Delete.
	(region_model::get_stack_region_id): Delete.
	(region_model::push_frame): Delete.
	(region_model::get_current_frame_id): Delete.
	(region_model::get_current_function): Delete.
	(region_model::pop_frame): Delete.
	(region_model::on_top_level_param): New.
	(region_model::get_stack_depth): Delete.
	(region_model::get_function_at_depth): Delete.
	(region_model::get_globals_region_id): Delete.
	(region_model::add_svalue): Delete.
	(region_model::replace_svalue): Delete.
	(region_model::add_region): Delete.
	(region_model::get_svalue): Delete.
	(region_model::get_region): Delete.
	(make_region_for_type): Delete.
	(region_model::add_region_for_type): Delete.
	(region_model::on_top_level_param): New.
	(class restrict_to_used_svalues): Delete.
	(region_model::purge_unused_svalues): Delete.
	(region_model::push_frame): New.
	(region_model::remap_svalue_ids): Delete.
	(region_model::remap_region_ids): Delete.
	(region_model::purge_regions): Delete.
	(region_model::get_descendents): Delete.
	(region_model::delete_region_and_descendents): Delete.
	(region_model::poison_any_pointers_to_bad_regions): Delete.
	(region_model::can_merge_with_p): Delete.
	(region_model::get_current_function): New.
	(region_model::get_value_by_name): Delete.
	(region_model::convert_byte_offset_to_array_index): Delete.
	(region_model::pop_frame): New.
	(region_model::get_or_create_mem_ref): Delete.
	(region_model::get_stack_depth): New.
	(region_model::get_frame_at_index): New.
	(region_model::unbind_region_and_descendents): New.
	(struct bad_pointer_finder): New.
	(region_model::get_or_create_pointer_plus_expr): Delete.
	(region_model::poison_any_pointers_to_descendents): New.
	(region_model::get_or_create_view): Delete.
	(region_model::can_merge_with_p): New.
	(region_model::get_fndecl_for_call):  Port from svalue_id to
	const svalue *.
	(struct append_ssa_names_cb_data): New.
	(get_ssa_name_regions_for_current_frame): New.
	(region_model::append_ssa_names_cb): New.
	(model_merger::dump_to_pp): Add "simple" param.  Drop dumping of
	remappings.
	(model_merger::dump): Add "simple" param to both overloads.
	(model_merger::can_merge_values_p): Delete.
	(model_merger::record_regions): Delete.
	(model_merger::record_svalues): Delete.
	(svalue_id_merger_mapping::svalue_id_merger_mapping): Delete.
	(svalue_id_merger_mapping::dump_to_pp): Delete.
	(svalue_id_merger_mapping::dump): Delete.
	(region_model::create_region_for_heap_alloc): New.
	(region_model::create_region_for_alloca): New.
	(region_model::record_dynamic_extents): New.
	(canonicalization::canonicalization): Delete.
	(canonicalization::walk_rid): Delete.
	(canonicalization::walk_sid): Delete.
	(canonicalization::dump_to_pp): Delete.
	(canonicalization::dump): Delete.
	(inchash::add): Delete overloads for svalue_id and region_id.
	(engine::log_stats): New.
	(assert_condition): Add overload comparing svalues.
	(assert_dump_eq): Pass "true" for multiline.
	(selftest::test_dump): Update for rewrite of region_model.
	(selftest::test_dump_2): Rename to...
	(selftest::test_struct): ...this.  Provide a region_model_manager
	when creating region_model instance.  Remove dump test.  Add
	checks for get_offset.
	(selftest::test_dump_3): Rename to...
	(selftest::test_array_1): ...this.  Provide a region_model_manager
	when creating region_model instance.  Remove dump test.
	(selftest::test_get_representative_tree): Port from svalue_id to
	new API.  Add test coverage for various expressions.
	(selftest::test_unique_constants): Provide a region_model_manager
	for the region_model.  Add test coverage for comparing const vs
	non-const.
	(selftest::test_svalue_equality): Delete.
	(selftest::test_region_equality): Delete.
	(selftest::test_unique_unknowns): New.
	(class purge_all_svalue_ids): Delete.
	(class purge_one_svalue_id): Delete.
	(selftest::test_purging_by_criteria): Delete.
	(selftest::test_initial_svalue_folding): New.
	(selftest::test_unaryop_svalue_folding): New.
	(selftest::test_binop_svalue_folding): New.
	(selftest::test_sub_svalue_folding): New.
	(selftest::test_purge_unused_svalues): Delete.
	(selftest::test_descendent_of_p): New.
	(selftest::test_assignment): Provide a region_model_manager for
	the region_model.  Drop the dump test.
	(selftest::test_compound_assignment): Likewise.
	(selftest::test_stack_frames): Port to new implementation.
	(selftest::test_get_representative_path_var): Likewise.
	(selftest::test_canonicalization_1): Rename to...
	(selftest::test_equality_1): ...this.  Port to new API, and add
	(selftest::test_canonicalization_2): Provide a
	region_model_manager when creating region_model instances.
	Remove redundant canicalization.
	(selftest::test_canonicalization_3): Provide a
	region_model_manager when creating region_model instances.
	Remove param from calls to region_model::canonicalize.
	(selftest::test_canonicalization_4): Likewise.
	(selftest::assert_region_models_merge): Constify
	out_merged_svalue.  Port to new API.
	(selftest::test_state_merging): Provide a
	region_model_manager when creating region_model instances.
	Provide a program_point point when merging them.  Replace
	set_to_new_unknown_value with usage of placeholder_svalues.
	Drop get_value_by_name.  Port from svalue_id to const svalue *.
	Add test of heap allocation.
	(selftest::test_constraint_merging):  Provide a
	region_model_manager when creating region_model instances.
	Provide a program_point point when merging them.  Eliminate use
	of set_to_new_unknown_value.
	(selftest::test_widening_constraints): New.
	(selftest::test_iteration_1): New.
	(selftest::test_malloc_constraints): Port to store-based
	implementation.
	(selftest::test_var): New test.
	(selftest::test_array_2): New test.
	(selftest::test_mem_ref): New test.
	(selftest::test_POINTER_PLUS_EXPR_then_MEM_REF): New.
	(selftest::test_malloc): New.
	(selftest::test_alloca): New.
	(selftest::analyzer_region_model_cc_tests): Update for renamings.
	Call new functions.
	* region-model.h (class path_var): Move to analyzer.h.
	(class svalue_id): Delete.
	(class region_id): Delete.
	(class id_map): Delete.
	(svalue_id_map): Delete.
	(region_id_map): Delete.
	(id_map<T>::id_map): Delete.
	(id_map<T>::put): Delete.
	(id_map<T>::get_dst_for_src): Delete.
	(id_map<T>::get_src_for_dst): Delete.
	(id_map<T>::dump_to_pp): Delete.
	(id_map<T>::dump): Delete.
	(id_map<T>::update): Delete.
	(one_way_svalue_id_map): Delete.
	(one_way_region_id_map): Delete.
	(class region_id_set): Delete.
	(class svalue_id_set): Delete.
	(struct complexity): New.
	(class visitor): New.
	(enum svalue_kind): Add SK_SETJMP, SK_INITIAL, SK_UNARYOP,
	SK_BINOP, SK_SUB,SK_UNMERGEABLE, SK_PLACEHOLDER, SK_WIDENING,
	SK_COMPOUND, and SK_CONJURED.
	(svalue::operator==): Delete.
	(svalue::operator!=): Delete.
	(svalue::clone): Delete.
	(svalue::hash): Delete.
	(svalue::dump_dot_to_pp): Delete.
	(svalue::dump_to_pp): New.
	(svalue::dump): New.
	(svalue::get_desc): New.
	(svalue::dyn_cast_initial_svalue): New.
	(svalue::dyn_cast_unaryop_svalue): New.
	(svalue::dyn_cast_binop_svalue): New.
	(svalue::dyn_cast_sub_svalue): New.
	(svalue::dyn_cast_unmergeable_svalue): New.
	(svalue::dyn_cast_widening_svalue): New.
	(svalue::dyn_cast_compound_svalue): New.
	(svalue::dyn_cast_conjured_svalue): New.
	(svalue::maybe_undo_cast): New.
	(svalue::unwrap_any_unmergeable): New.
	(svalue::remap_region_ids): Delete
	(svalue::can_merge_p): New.
	(svalue::walk_for_canonicalization): Delete
	(svalue::get_complexity): New.
	(svalue::get_child_sid): Delete
	(svalue::accept): New.
	(svalue::live_p): New.
	(svalue::implicitly_live_p): New.
	(svalue::svalue): Add complexity param.
	(svalue::add_to_hash): Delete
	(svalue::print_details): Delete
	(svalue::m_complexity): New field.
	(region_svalue::key_t): New struct.
	(region_svalue::region_svalue): Port from region_id to
	const region_id *.  Add complexity.
	(region_svalue::compare_fields): Delete.
	(region_svalue::clone): Delete.
	(region_svalue::dump_dot_to_pp): Delete.
	(region_svalue::get_pointee): Port from region_id to
	const region_id *.
	(region_svalue::remap_region_ids): Delete.
	(region_svalue::merge_values): Delete.
	(region_svalue::dump_to_pp): New.
	(region_svalue::accept): New.
	(region_svalue::walk_for_canonicalization): Delete.
	(region_svalue::eval_condition): Make params const.
	(region_svalue::add_to_hash): Delete.
	(region_svalue::print_details): Delete.
	(region_svalue::m_rid): Replace with...
	(region_svalue::m_reg): ...this.
	(is_a_helper <region_svalue *>::test): Convert to...
	(is_a_helper <const region_svalue *>::test): ...this.
	(template <> struct default_hash_traits<region_svalue::key_t>):
	New.
	(constant_svalue::constant_svalue): Add complexity.
	(constant_svalue::compare_fields): Delete.
	(constant_svalue::clone): Delete.
	(constant_svalue::add_to_hash): Delete.
	(constant_svalue::dump_to_pp): New.
	(constant_svalue::accept): New.
	(constant_svalue::implicitly_live_p): New.
	(constant_svalue::merge_values): Delete.
	(constant_svalue::eval_condition): Make params const.
	(constant_svalue::get_child_sid): Delete.
	(constant_svalue::print_details): Delete.
	(is_a_helper <constant_svalue *>::test): Convert to...
	(is_a_helper <const constant_svalue *>::test): ...this.
	(class unknown_svalue): Update leading comment.
	(unknown_svalue::unknown_svalue): Add complexity.
	(unknown_svalue::compare_fields): Delete.
	(unknown_svalue::add_to_hash): Delete.
	(unknown_svalue::dyn_cast_unknown_svalue): Delete.
	(unknown_svalue::print_details): Delete.
	(unknown_svalue::dump_to_pp): New.
	(unknown_svalue::accept): New.
	(poisoned_svalue::key_t): New struct.
	(poisoned_svalue::poisoned_svalue): Add complexity.
	(poisoned_svalue::compare_fields): Delete.
	(poisoned_svalue::clone): Delete.
	(poisoned_svalue::add_to_hash): Delete.
	(poisoned_svalue::dump_to_pp): New.
	(poisoned_svalue::accept): New.
	(poisoned_svalue::print_details): Delete.
	(is_a_helper <poisoned_svalue *>::test): Convert to...
	(is_a_helper <const poisoned_svalue *>::test): ...this.
	(template <> struct default_hash_traits<poisoned_svalue::key_t>):
	New.
	(setjmp_record::add_to_hash): New.
	(setjmp_svalue::key_t): New struct.
	(setjmp_svalue::compare_fields): Delete.
	(setjmp_svalue::clone): Delete.
	(setjmp_svalue::add_to_hash): Delete.
	(setjmp_svalue::setjmp_svalue): Add complexity.
	(setjmp_svalue::dump_to_pp): New.
	(setjmp_svalue::accept): New.
	(setjmp_svalue::void print_details): Delete.
	(is_a_helper <const setjmp_svalue *>::test): New.
	(template <> struct default_hash_traits<setjmp_svalue::key_t>): New.
	(class initial_svalue : public svalue): New.
	(is_a_helper <const initial_svalue *>::test): New.
	(class unaryop_svalue): New.
	(is_a_helper <const unaryop_svalue *>::test): New.
	(template <> struct default_hash_traits<unaryop_svalue::key_t>): New.
	(class binop_svalue): New.
	(is_a_helper <const binop_svalue *>::test): New.
	(template <> struct default_hash_traits<binop_svalue::key_t>): New.
	(class sub_svalue): New.
	(is_a_helper <const sub_svalue *>::test): New.
	(template <> struct default_hash_traits<sub_svalue::key_t>): New.
	(class unmergeable_svalue): New.
	(is_a_helper <const unmergeable_svalue *>::test): New.
	(class placeholder_svalue): New.
	(is_a_helper <placeholder_svalue *>::test): New.
	(class widening_svalue): New.
	(is_a_helper <widening_svalue *>::test): New.
	(template <> struct default_hash_traits<widening_svalue::key_t>): New.
	(class compound_svalue): New.
	(is_a_helper <compound_svalue *>::test): New.
	(template <> struct default_hash_traits<compound_svalue::key_t>): New.
	(class conjured_svalue): New.
	(is_a_helper <conjured_svalue *>::test): New.
	(template <> struct default_hash_traits<conjured_svalue::key_t>): New.
	(enum region_kind): Delete RK_PRIMITIVE, RK_STRUCT, RK_UNION, and
	RK_ARRAY.  Add RK_LABEL, RK_DECL, RK_FIELD, RK_ELEMENT, RK_OFFSET,
	RK_CAST, RK_HEAP_ALLOCATED, RK_ALLOCA, RK_STRING, and RK_UNKNOWN.
	(region_kind_to_str): Delete.
	(region::~region): Move implementation to region.cc.
	(region::operator==): Delete.
	(region::operator!=): Delete.
	(region::clone): Delete.
	(region::get_id): New.
	(region::cmp_ids): New.
	(region::dyn_cast_map_region): Delete.
	(region::dyn_cast_array_region): Delete.
	(region::region_id get_parent): Delete.
	(region::get_parent_region): Convert to a simple accessor.
	(region::void set_value): Delete.
	(region::svalue_id get_value): Delete.
	(region::svalue_id get_value_direct): Delete.
	(region::svalue_id get_inherited_child_sid): Delete.
	(region::dyn_cast_frame_region): New.
	(region::dyn_cast_function_region): New.
	(region::dyn_cast_decl_region): New.
	(region::dyn_cast_field_region): New.
	(region::dyn_cast_element_region): New.
	(region::dyn_cast_offset_region): New.
	(region::dyn_cast_cast_region): New.
	(region::dyn_cast_string_region): New.
	(region::accept): New.
	(region::get_base_region): New.
	(region::base_region_p): New.
	(region::descendent_of_p): New.
	(region::maybe_get_frame_region): New.
	(region::maybe_get_decl): New.
	(region::hash): Delete.
	(region::rint): Delete.
	(region::dump_dot_to_pp): Delete.
	(region::get_desc): New.
	(region::dump_to_pp): Convert to vfunc, changing signature.
	(region::dump_child_label): Delete.
	(region::remap_svalue_ids): Delete.
	(region::remap_region_ids): Delete.
	(region::dump): New.
	(region::walk_for_canonicalization): Delete.
	(region::non_null_p): Drop region_model param.
	(region::add_view): Delete.
	(region::get_view): Delete.
	(region::get_active_view): Delete.
	(region::is_view_p): Delete.
	(region::cmp_ptrs): New.
	(region::validate): Delete.
	(region::get_offset): New.
	(region::get_byte_size): New.
	(region::get_bit_size): New.
	(region::get_subregions_for_binding): New.
	(region::region): Add complexity param.  Convert parent from
	region_id to const region *.  Drop svalue_id.  Drop copy ctor.
	(region::symbolic_for_unknown_ptr_p): New.
	(region::add_to_hash): Delete.
	(region::print_fields): Delete.
	(region::get_complexity): New accessor.
	(region::become_active_view): Delete.
	(region::deactivate_any_active_view): Delete.
	(region::deactivate_view): Delete.
	(region::calc_offset): New.
	(region::m_parent_rid): Delete.
	(region::m_sval_id): Delete.
	(region::m_complexity): New.
	(region::m_id): New.
	(region::m_parent): New.
	(region::m_view_rids): Delete.
	(region::m_is_view): Delete.
	(region::m_active_view_rid): Delete.
	(region::m_cached_offset): New.
	(is_a_helper <region *>::test): Convert to...
	(is_a_helper <const region *>::test): ... this.
	(class primitive_region): Delete.
	(class space_region): New.
	(class map_region): Delete.
	(is_a_helper <map_region *>::test): Delete.
	(class frame_region): Reimplement.
	(template <> struct default_hash_traits<frame_region::key_t>):
	New.
	(class globals_region): Reimplement.
	(is_a_helper <globals_region *>::test): Convert to...
	(is_a_helper <const globals_region *>::test): ...this.
	(class struct_or_union_region): Delete.
	(is_a_helper <struct_or_union_region *>::test): Delete.
	(class code_region): Reimplement.
	(is_a_helper <const code_region *>::test): New.
	(class struct_region): Delete.
	(is_a_helper <struct_region *>::test): Delete.
	(class function_region): Reimplement.
	(is_a_helper <function_region *>::test): Convert to...
	(is_a_helper <const function_region *>::test): ...this.
	(class union_region): Delete.
	(is_a_helper <union_region *>::test): Delete.
	(class label_region): New.
	(is_a_helper <const label_region *>::test): New.
	(class scope_region): Delete.
	(class stack_region): Reimplement.
	(is_a_helper <stack_region *>::test): Convert to...
	(is_a_helper <const stack_region *>::test): ...this.
	(class heap_region): Reimplement.
	(is_a_helper <heap_region *>::test): Convert to...
	(is_a_helper <const heap_region *>::test): ...this.
	(class root_region): Reimplement.
	(is_a_helper <root_region *>::test): Convert to...
	(is_a_helper <const root_region *>::test): ...this.
	(class symbolic_region): Reimplement.
	(is_a_helper <const symbolic_region *>::test): New.
	(template <> struct default_hash_traits<symbolic_region::key_t>):
	New.
	(class decl_region): New.
	(is_a_helper <const decl_region *>::test): New.
	(class field_region): New.
	(template <> struct default_hash_traits<field_region::key_t>): New.
	(class array_region): Delete.
	(class element_region): New.
	(is_a_helper <array_region *>::test): Delete.
	(is_a_helper <const element_region *>::test): New.
	(template <> struct default_hash_traits<element_region::key_t>):
	New.
	(class offset_region): New.
	(is_a_helper <const offset_region *>::test): New.
	(template <> struct default_hash_traits<offset_region::key_t>):
	New.
	(class cast_region): New.
	(is_a_helper <const cast_region *>::test): New.
	(template <> struct default_hash_traits<cast_region::key_t>): New.
	(class heap_allocated_region): New.
	(class alloca_region): New.
	(class string_region): New.
	(is_a_helper <const string_region *>::test): New.
	(class unknown_region): New.
	(class region_model_manager): New.
	(struct append_ssa_names_cb_data): New.
	(class call_details): New.
	(region_model::region_model): Add region_model_manager param.
	(region_model::print_svalue): Delete.
	(region_model::dump_dot_to_pp): Delete.
	(region_model::dump_dot_to_file): Delete.
	(region_model::dump_dot): Delete.
	(region_model::dump_to_pp): Drop summarize param in favor of
	simple and multiline.
	(region_model::dump): Likewise.
	(region_model::summarize_to_pp): Delete.
	(region_model::summarize): Delete.
	(region_model::void canonicalize): Drop ctxt param.
	(region_model::void check_for_poison): Delete.
	(region_model::get_gassign_result): New.
	(region_model::impl_call_alloca): New.
	(region_model::impl_call_analyzer_describe): New.
	(region_model::impl_call_analyzer_eval): New.
	(region_model::impl_call_builtin_expect): New.
	(region_model::impl_call_calloc): New.
	(region_model::impl_call_free): New.
	(region_model::impl_call_malloc): New.
	(region_model::impl_call_memset): New.
	(region_model::impl_call_strlen): New.
	(region_model::get_reachable_svalues): New.
	(region_model::handle_phi): Drop is_back_edge param.
	(region_model::region_id get_root_rid): Delete.
	(region_model::root_region *get_root_region): Delete.
	(region_model::region_id get_stack_region_id): Delete.
	(region_model::push_frame): Convert from region_id and svalue_id
	to const region * and const svalue *.
	(region_model::get_current_frame_id): Replace with...
	(region_model::get_current_frame): ...this.
	(region_model::pop_frame): Convert from region_id to
	const region *.  Drop purge and stats param.  Add out_result.
	(region_model::function *get_function_at_depth): Delete.
	(region_model::get_globals_region_id): Delete.
	(region_model::add_svalue): Delete.
	(region_model::replace_svalue): Delete.
	(region_model::add_region): Delete.
	(region_model::add_region_for_type): Delete.
	(region_model::get_svalue): Delete.
	(region_model::get_region): Delete.
	(region_model::get_lvalue): Convert from region_id to
	const region *.
	(region_model::get_rvalue): Convert from svalue_id to
	const svalue *.
	(region_model::get_or_create_ptr_svalue): Delete.
	(region_model::get_or_create_constant_svalue): Delete.
	(region_model::get_svalue_for_fndecl): Delete.
	(region_model::get_svalue_for_label): Delete.
	(region_model::get_region_for_fndecl): Delete.
	(region_model::get_region_for_label): Delete.
	(region_model::get_frame_at_index (int index) const;): New.
	(region_model::maybe_cast): Delete.
	(region_model::maybe_cast_1): Delete.
	(region_model::get_field_region): Delete.
	(region_model::id deref_rvalue): Convert from region_id and
	svalue_id to const region * and const svalue *.  Drop overload,
	passing in both a tree and an svalue.
	(region_model::set_value): Convert from region_id and svalue_id to
	const region * and const svalue *.
	(region_model::set_to_new_unknown_value): Delete.
	(region_model::clobber_region (const region *reg);): New.
	(region_model::purge_region (const region *reg);): New.
	(region_model::zero_fill_region (const region *reg);): New.
	(region_model::mark_region_as_unknown (const region *reg);): New.
	(region_model::copy_region): Convert from region_id to
	const region *.
	(region_model::eval_condition): Convert from svalue_id to
	const svalue *.
	(region_model::eval_condition_without_cm): Likewise.
	(region_model::compare_initial_and_pointer): New.
	(region_model:maybe_get_constant): Delete.
	(region_model::add_new_malloc_region): Delete.
	(region_model::get_representative_tree): Convert from svalue_id to
	const svalue *.
	(region_model::get_representative_path_var): Delete decl taking a
	region_id in favor of two decls, for svalue vs region, with an
	svalue_set to ensure termination.
	(region_model::get_path_vars_for_svalue): Delete.
	(region_model::create_region_for_heap_alloc): New.
	(region_model::create_region_for_alloca): New.
	(region_model::purge_unused_svalues): Delete.
	(region_model::remap_svalue_ids): Delete.
	(region_model::remap_region_ids): Delete.
	(region_model::purge_regions): Delete.
	(region_model::get_num_svalues): Delete.
	(region_model::get_num_regions): Delete.
	(region_model::get_descendents): Delete.
	(region_model::get_store): New.
	(region_model::delete_region_and_descendents): Delete.
	(region_model::get_manager): New.
	(region_model::unbind_region_and_descendents): New.
	(region_model::can_merge_with_p): Add point param.  Drop
	svalue_id_merger_mapping.
	(region_model::get_value_by_name): Delete.
	(region_model::convert_byte_offset_to_array_index): Delete.
	(region_model::get_or_create_mem_ref): Delete.
	(region_model::get_or_create_pointer_plus_expr): Delete.
	(region_model::get_or_create_view): Delete.
	(region_model::get_lvalue_1): Convert from region_id to
	const region *.
	(region_model::get_rvalue_1): Convert from svalue_id to
	const svalue *.
	(region_model::get_ssa_name_regions_for_current_frame): New.
	(region_model::append_ssa_names_cb): New.
	(region_model::get_store_value): New.
	(region_model::copy_struct_region): Delete.
	(region_model::copy_union_region): Delete.
	(region_model::copy_array_region): Delete.
	(region_model::region_exists_p): New.
	(region_model::make_region_for_unexpected_tree_code): Delete.
	(region_model::loop_replay_fixup): New.
	(region_model::poison_any_pointers_to_bad_regions): Delete.
	(region_model::poison_any_pointers_to_descendents): New.
	(region_model::dump_summary_of_rep_path_vars): Delete.
	(region_model::on_top_level_param): New.
	(region_model::record_dynamic_extents): New.
	(region_model::m_mgr;): New.
	(region_model::m_store;): New.
	(region_model::m_svalues;): Delete.
	(region_model::m_regions;): Delete.
	(region_model::m_root_rid;): Delete.
	(region_model::m_current_frame;): New.
	(region_model_context::remap_svalue_ids): Delete.
	(region_model_context::can_purge_p): Delete.
	(region_model_context::on_svalue_leak): New.
	(region_model_context::on_svalue_purge): Delete.
	(region_model_context::on_liveness_change): New.
	(region_model_context::on_inherited_svalue): Delete.
	(region_model_context::on_cast): Delete.
	(region_model_context::on_unknown_change): Convert from svalue_id to
	const svalue * and add is_mutable.
	(class noop_region_model_context): Update for region_model_context
	changes.
	(model_merger::model_merger): Add program_point.  Drop
	svalue_id_merger_mapping.
	(model_merger::dump_to_pp): Add "simple" param.
	(model_merger::dump): Likewise.
	(model_merger::get_region_a): Delete.
	(model_merger::get_region_b): Delete.
	(model_merger::can_merge_values_p): Delete.
	(model_merger::record_regions): Delete.
	(model_merger::record_svalues): Delete.
	(model_merger::m_point): New field.
	(model_merger::m_map_regions_from_a_to_m): Delete.
	(model_merger::m_map_regions_from_b_to_m): Delete.
	(model_merger::m_sid_mapping): Delete.
	(struct svalue_id_merger_mapping): Delete.
	(class engine): New.
	(struct canonicalization): Delete.
	(inchash::add): Delete decls for hashing svalue_id and region_id.
	(test_region_model_context::on_unexpected_tree_code): Require t to
	be non-NULL.
	(selftest::assert_condition): Add overload comparing a pair of
	const svalue *.
	* sm-file.cc: Include "tristate.h", "selftest.h",
	"analyzer/call-string.h", "analyzer/program-point.h",
	"analyzer/store.h", and "analyzer/region-model.h".
	(fileptr_state_machine::get_default_state): New.
	(fileptr_state_machine::on_stmt): Remove calls to
	get_readable_tree in favor of get_diagnostic_tree.
	* sm-malloc.cc: Include "tristate.h", "selftest.h",
	"analyzer/call-string.h", "analyzer/program-point.h",
	"analyzer/store.h", and "analyzer/region-model.h".
	(malloc_state_machine::get_default_state): New.
	(malloc_state_machine::reset_when_passed_to_unknown_fn_p): New.
	(malloc_diagnostic::describe_state_change): Handle change.m_expr
	being NULL.
	(null_arg::emit): Avoid printing "NULL '0'".
	(null_arg::describe_final_event): Avoid printing "(0) NULL".
	(malloc_leak::emit): Handle m_arg being NULL.
	(malloc_leak::describe_final_event): Handle ev.m_expr being NULL.
	(malloc_state_machine::on_stmt): Don't call get_readable_tree.
	Call get_diagnostic_tree when creating pending diagnostics.
	Update for is_zero_assignment becoming a member function of
	sm_ctxt.
	Don't transition to m_non_heap for ADDR_EXPR(MEM_REF()).
	(malloc_state_machine::reset_when_passed_to_unknown_fn_p): New
	vfunc implementation.
	* sm-sensitive.cc (sensitive_state_machine::warn_for_any_exposure): Call
	get_diagnostic_tree and pass the result to warn_for_state.
	* sm-signal.cc: Move includes of "analyzer/call-string.h" and
	"analyzer/program-point.h" to before "analyzer/region-model.h",
	and also include "analyzer/store.h" before it.
	(signal_unsafe_call::describe_state_change): Use
	get_dest_function to get handler.
	(update_model_for_signal_handler): Pass manager to region_model
	ctor.
	(register_signal_handler::impl_transition): Update for changes to
	get_or_create_node and add_edge.
	* sm-taint.cc (taint_state_machine::on_stmt): Remove calls to
	get_readable_tree, replacing them when calling warn_for_state with
	calls to get_diagnostic_tree.
	* sm.cc (is_zero_assignment): Delete.
	(any_pointer_p): Move to within namespace ana.
	* sm.h (is_zero_assignment): Remove decl.
	(any_pointer_p): Move decl to within namespace ana.
	(state_machine::get_default_state): New vfunc.
	(state_machine::reset_when_passed_to_unknown_fn_p): New vfunc.
	(sm_context::get_readable_tree): Rename to...
	(sm_context::get_diagnostic_tree): ...this.
	(sm_context::is_zero_assignment): New vfunc.
	* store.cc: New file.
	* store.h: New file.
	* svalue.cc: New file.

gcc/testsuite/ChangeLog:
	PR analyzer/93032
	PR analyzer/93938
	PR analyzer/94011
	PR analyzer/94099
	PR analyzer/94399
	PR analyzer/94458
	PR analyzer/94503
	PR analyzer/94640
	PR analyzer/94688
	PR analyzer/94689
	PR analyzer/94839
	PR analyzer/95026
	PR analyzer/95042
	PR analyzer/95240
	* g++.dg/analyzer/pr93212.C: Add dg-warning for dangling
	reference.
	* g++.dg/analyzer/pr93950.C: Remove xfail.
	* g++.dg/analyzer/pr94011.C: New test.
	* g++.dg/analyzer/pr94028.C: Remove leak false positives; mark as
	failing on C++98.
	* g++.dg/analyzer/pr94503.C: New test.
	* g++.dg/analyzer/pr95042.C: New test.
	* gcc.dg/analyzer/CVE-2005-1689-dedupe-issue-2.c: New test.
	* gcc.dg/analyzer/CVE-2005-1689-dedupe-issue.c: Add xfail.
	* gcc.dg/analyzer/CVE-2005-1689-minimal.c:
	Include "analyzer-decls.h".
	(test_4, test_5, test_6, test_7, test_8): New tests.
	* gcc.dg/analyzer/abs-1.c: New test.
	* gcc.dg/analyzer/aliasing-1.c: New test.
	* gcc.dg/analyzer/aliasing-2.c: New test.
	* gcc.dg/analyzer/analyzer-decls.h (__analyzer_describe): New
	decl.
	(__analyzer_dump_num_heap_regions): Remove.
	* gcc.dg/analyzer/attribute-nonnull.c: Add dg-warnings for cases
	where NULL is directly used as an argument.
	* gcc.dg/analyzer/bzero-1.c: New test.
	* gcc.dg/analyzer/casts-1.c: New test.
	* gcc.dg/analyzer/casts-2.c: New test.
	* gcc.dg/analyzer/compound-assignment-1.c
	(test_4): Remove xfail from leak false positive.
	(called_by_test_5a): Add "allocated here" expected message.
	(called_by_test_5b): Make expected leak message more precise.
	* gcc.dg/analyzer/compound-assignment-3.c: Update expected leak
	message.
	* gcc.dg/analyzer/compound-assignment-4.c: New test.
	* gcc.dg/analyzer/compound-assignment-5.c: New test.
	* gcc.dg/analyzer/conditionals-notrans.c: Remove xfails.
	* gcc.dg/analyzer/data-model-1.c (test_12d): Update expected
	results.
	(test_13): Remove xfail.
	(test_14): Remove xfail.
	(test_15): Remove xfail.
	(test_16): Remove xfails.  Add out-of-bounds access.
	(test_16_alt): Remove xfails.
	(test_23): Remove xfail.
	(test_24): Remove xfail.
	(test_25): Remove xfail.
	(test_26): Update expected result.  Remove xfail.  Add xfail.
	(test_27): Remove xfails.
	(test_29): Add __analyzer_eval pointer comparisons.
	(test_41): Generalize expected output for u.ptr comparison with
	NULL for targets where this could be known to be false.
	(test_42): Remove xfail.
	(test_51): Remove xfails.
	* gcc.dg/analyzer/data-model-13.c: Update for improvements to
	source location and wording of leak message.
	* gcc.dg/analyzer/data-model-14.c: Remove -fanalyzer-fine-grained.
	(test_1): Update for improvement to expected message.
	(test_2): Remove xfail.
	* gcc.dg/analyzer/data-model-18.c: Remove xfail.
	* gcc.dg/analyzer/data-model-20.c: New test.
	* gcc.dg/analyzer/data-model-5.c: Add dg-warning for deref of
	NULL.  Add xfailing false leak.
	* gcc.dg/analyzer/data-model-5b.c: Add xfailing false leak.
	* gcc.dg/analyzer/data-model-5c.c: Update xfailing false leak.
	* gcc.dg/analyzer/data-model-5d.c: Reimplement.
	* gcc.dg/analyzer/data-model-6.c: Delete test.
	* gcc.dg/analyzer/data-model-8.c: Remove xfail.
	* gcc.dg/analyzer/describe-1.c: New test.
	* gcc.dg/analyzer/dot-output.c: Remove xfail.
	* gcc.dg/analyzer/explode-1.c: Add expected leak warning.
	* gcc.dg/analyzer/explode-2.c: Add expected leak warnings.  Mark
	double-free warnings as xfail for now.
	* gcc.dg/analyzer/feasibility-1.c: New test.
	* gcc.dg/analyzer/first-field-1.c: New test.
	* gcc.dg/analyzer/first-field-2.c: New test.
	* gcc.dg/analyzer/init.c: New test.
	* gcc.dg/analyzer/leak-2.c: New test.
	* gcc.dg/analyzer/loop-0-up-to-n-by-1-with-iter-obj.c: New test.
	* gcc.dg/analyzer/loop-0-up-to-n-by-1.c: New test.
	* gcc.dg/analyzer/loop-2a.c: Update expected behavior.
	* gcc.dg/analyzer/loop-3.c: Mark use-after-free as xfail.  Add
	expected warning about deref of unchecked pointer.
	* gcc.dg/analyzer/loop-4.c: Remove -fno-analyzer-state-purge.
	Update expected behavior.
	* gcc.dg/analyzer/loop-n-down-to-1-by-1.c: New test.
	* gcc.dg/analyzer/loop-start-down-to-end-by-1.c: New test.
	* gcc.dg/analyzer/loop-start-down-to-end-by-step.c: New test.
	* gcc.dg/analyzer/loop-start-to-end-by-step.c: New test.
	* gcc.dg/analyzer/loop-start-up-to-end-by-1.c: New test.
	* gcc.dg/analyzer/loop.c: Remove -fno-analyzer-state-purge.
	Update expected behavior.
	* gcc.dg/analyzer/malloc-1.c: Remove xfails from leak false
	positives.  Update expected wording of global_link.m_ptr leak.
	(test_49): New test.
	* gcc.dg/analyzer/malloc-4.c: Remove leak false positive.  Update
	expected wording of leak warning.
	* gcc.dg/analyzer/malloc-in-loop.c: New test.
	* gcc.dg/analyzer/malloc-ipa-8-double-free.c: Update expected path
	to show call to wrapped_malloc.
	* gcc.dg/analyzer/malloc-ipa-8-unchecked.c: Remove
	-fanalyzer-verbose-state-changes.
	* gcc.dg/analyzer/malloc-paths-9.c: Remove comment about duplicate
	warnings.  Remove duplicate use-after-free paths.
	* gcc.dg/analyzer/malloc-vs-local-1a.c: Add dg-warning for deref
	of unchecked pointer.  Update expected number of enodes.
	* gcc.dg/analyzer/malloc-vs-local-2.c: Likewise.
	* gcc.dg/analyzer/malloc-vs-local-3.c: Add dg-warning for deref of
	unchecked pointer.  Update expected number of enodes.  Avoid
	overspecifying the leak message.
	* gcc.dg/analyzer/memset-1.c: New test.
	* gcc.dg/analyzer/paths-3.c: Update expected number of enodes.
	* gcc.dg/analyzer/paths-4.c: Likewise.
	* gcc.dg/analyzer/paths-6.c: Likewise.
	* gcc.dg/analyzer/paths-7.c: Likewise.
	* gcc.dg/analyzer/pr93032-mztools-simplified.c: New test.
	* gcc.dg/analyzer/pr93032-mztools.c: New test.
	* gcc.dg/analyzer/pr93382.c: Mark taint tests as failing.
	* gcc.dg/analyzer/pr93938.c: New test.
	* gcc.dg/analyzer/pr94099.c: Replace uninit dg-warning with
	dg-warning for NULL dereference.
	* gcc.dg/analyzer/pr94399.c: New test.
	* gcc.dg/analyzer/pr94447.c: Add dg-warning for NULL dereference.
	* gcc.dg/analyzer/pr94458.c: New test.
	* gcc.dg/analyzer/pr94640.c: New test.
	* gcc.dg/analyzer/pr94688.c: New test.
	* gcc.dg/analyzer/pr94689.c: New test.
	* gcc.dg/analyzer/pr94839.c: New test.
	* gcc.dg/analyzer/pr95026.c: New test.
	* gcc.dg/analyzer/pr95240.c: New test.
	* gcc.dg/analyzer/refcounting-1.c: New test.
	* gcc.dg/analyzer/single-field.c: New test.
	* gcc.dg/analyzer/stale-frame-1.c: New test.
	* gcc.dg/analyzer/symbolic-1.c: New test.
	* gcc.dg/analyzer/symbolic-2.c: New test.
	* gcc.dg/analyzer/symbolic-3.c: New test.
	* gcc.dg/analyzer/symbolic-4.c: New test.
	* gcc.dg/analyzer/symbolic-5.c: New test.
	* gcc.dg/analyzer/symbolic-6.c: New test.
	* gcc.dg/analyzer/taint-1.c: Mark the "gets unchecked value"
	events as failing for now.  Update dg-message directives to avoid
	relying on numbering.
	* gcc.dg/analyzer/torture/loop-inc-ptr-1.c: New test.
	* gcc.dg/analyzer/torture/loop-inc-ptr-2.c: New test.
	* gcc.dg/analyzer/torture/loop-inc-ptr-3.c: New test.
	* gcc.dg/analyzer/unknown-fns-2.c: New test.
	* gcc.dg/analyzer/unknown-fns-3.c: New test.
	* gcc.dg/analyzer/unknown-fns-4.c: New test.
	* gcc.dg/analyzer/unknown-fns.c: Update dg-warning to reflect fixed
	source location for leak diagnostic.
	* gcc.dg/analyzer/use-after-free.c: New test.
	* gcc.dg/analyzer/vla-1.c: New test.
	* gcc.dg/analyzer/zlib-4.c: Rewrite to avoid "exit" calls.  Add
	expected leak warnings.
	* gfortran.dg/analyzer/pr93993.f90: Remove leak of tm warning,
	which seems to have been a false positive.