https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110426
--- Comment #2 from CVS Commits ---
The master branch has been updated by David Malcolm :
https://gcc.gnu.org/g:021077b94741c9300dfff3a24e95b3ffa3f508a7
commit r14-3001-g021077b94741c9300dfff3a24e95b3ffa3f508a7
Author: David Malcolm
Date: Fri Aug 4 16:18:40 2023 -0400
analyzer: handle function attribute "alloc_size" [PR110426]
This patch makes -fanalyzer make use of the function attribute
"alloc_size", allowing -fanalyzer to emit -Wanalyzer-allocation-size,
-Wanalyzer-out-of-bounds, and -Wanalyzer-tainted-allocation-size on
execution paths involving allocations using such functions.
gcc/analyzer/ChangeLog:
PR analyzer/110426
* bounds-checking.cc (region_model::check_region_bounds): Handle
symbolic base regions.
* call-details.cc: Include "stringpool.h" and "attribs.h".
(call_details::lookup_function_attribute): New function.
* call-details.h (call_details::lookup_function_attribute): New
function decl.
* region-model-manager.cc
(region_model_manager::maybe_fold_binop): Add reference to
PR analyzer/110902.
* region-model-reachability.cc (reachable_regions::handle_sval):
Add symbolic regions for pointers that are conjured svalues for
the LHS of a stmt.
* region-model.cc (region_model::canonicalize): Purge dynamic
extents for regions that aren't referenced.
(get_result_size_in_bytes): New function.
(region_model::on_call_pre): Use get_result_size_in_bytes and
potentially set the dynamic extents of the region pointed to by
the return value.
(region_model::deref_rvalue): Add param "add_nonnull_constraint"
and use it to conditionalize adding the constraint.
(pending_diagnostic_subclass::dubious_allocation_size): Add "stmt"
param to both ctors and use it to initialize new "m_stmt" field.
(pending_diagnostic_subclass::operator==): Use m_stmt; don't use
m_lhs or m_rhs.
(pending_diagnostic_subclass::m_stmt): New field.
(region_model::check_region_size): Generalize to any kind of
pointer svalue by using deref_rvalue rather than checking for
region_svalue. Pass stmt to dubious_allocation_size ctor.
* region-model.h (region_model::deref_rvalue): Add param
"add_nonnull_constraint".
* svalue.cc (conjured_svalue::lhs_value_p): New function.
* svalue.h (conjured_svalue::lhs_value_p): New decl.
gcc/testsuite/ChangeLog:
PR analyzer/110426
* gcc.dg/analyzer/allocation-size-1.c: Update expected message to
reflect consolidation of size and assignment into a single event.
* gcc.dg/analyzer/allocation-size-2.c: Likewise.
* gcc.dg/analyzer/allocation-size-3.c: Likewise.
* gcc.dg/analyzer/allocation-size-4.c: Likewise.
* gcc.dg/analyzer/allocation-size-multiline-1.c: Likewise.
* gcc.dg/analyzer/allocation-size-multiline-2.c: Likewise.
* gcc.dg/analyzer/allocation-size-multiline-3.c: Likewise.
* gcc.dg/analyzer/attr-alloc_size-1.c: New test.
* gcc.dg/analyzer/attr-alloc_size-2.c: New test.
* gcc.dg/analyzer/attr-alloc_size-3.c: New test.
* gcc.dg/analyzer/explode-4.c: New test.
* gcc.dg/analyzer/taint-size-1.c: Add test coverage for
__attribute__ alloc_size.
Signed-off-by: David Malcolm
