https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105900
--- Comment #4 from CVS Commits ---
The master branch has been updated by Tim Lange :
https://gcc.gnu.org/g:e6c3bb379f515b27268d08e62b4b3e5d7200b437
commit r13-1405-ge6c3bb379f515b27268d08e62b4b3e5d7200b437
Author: Tim Lange
Date: Fri Jul 1 00:02:17 2022 +0200
analyzer: add allocation size checker [PR105900]
This patch adds an checker that warns about code paths in which a buffer
is assigned to a incompatible type, i.e. when the allocated buffer size
is not a multiple of the pointee's size.
Regression-tested on x86_64 Linux. Also compiled coreutils, curl, openssh
and
httpd with the patch enabled.
2022-07-01 Tim Lange
gcc/analyzer/ChangeLog:
PR analyzer/105900
* analyzer.opt: Added Wanalyzer-allocation-size.
* checker-path.cc (region_creation_event::get_desc): Added call to
new
virtual function
pending_diagnostic::describe_region_creation_event.
* checker-path.h: Added region_creation_event::get_desc.
* diagnostic-manager.cc
(diagnostic_manager::add_event_on_final_node):
New function.
* diagnostic-manager.h:
Added diagnostic_manager::add_event_on_final_node.
* pending-diagnostic.h (struct region_creation): New event_desc
struct.
(pending_diagnostic::describe_region_creation_event): Added virtual
function to overwrite description of a region creation.
* region-model.cc (class dubious_allocation_size): New class.
(capacity_compatible_with_type): New helper function.
(class size_visitor): New class.
(struct_or_union_with_inheritance_p): New helper function.
(is_any_cast_p): New helper function.
(region_model::check_region_size): New function.
(region_model::set_value): Added call to
region_model::check_region_size.
* region-model.h (class region_model): New function
check_region_size.
* svalue.cc (region_svalue::accept): Changed to post-order
traversal.
(initial_svalue::accept): Likewise.
(unaryop_svalue::accept): Likewise.
(binop_svalue::accept): Likewise.
(sub_svalue::accept): Likewise.
(repeated_svalue::accept): Likewise.
(bits_within_svalue::accept): Likewise.
(widening_svalue::accept): Likewise.
(unmergeable_svalue::accept): Likewise.
(compound_svalue::accept): Likewise.
(conjured_svalue::accept): Likewise.
(asm_output_svalue::accept): Likewise.
(const_fn_result_svalue::accept): Likewise.
gcc/ChangeLog:
PR analyzer/105900
* doc/invoke.texi: Added Wanalyzer-allocation-size.
gcc/testsuite/ChangeLog:
PR analyzer/105900
* gcc.dg/analyzer/pr96639.c: Changed buffer size to omit warning.
* gcc.dg/analyzer/allocation-size-1.c: New test.
* gcc.dg/analyzer/allocation-size-2.c: New test.
* gcc.dg/analyzer/allocation-size-3.c: New test.
* gcc.dg/analyzer/allocation-size-4.c: New test.
* gcc.dg/analyzer/allocation-size-5.c: New test.
Signed-off-by: Tim Lange
