623bc02768
PR analyzer/96651 reports a false positive in which a global that can't have been touched yet is checked in "main". The analyzer fails to reject code paths in which the initial value of the global makes the path condition impossible. This patch detects cases where the code path begins at the entrypoint of "main", and extracts values from initializers for globals that can't have been touched yet, rather than using a symbolic "INIT_VAL(REG)", fixing the false positive. gcc/analyzer/ChangeLog: PR analyzer/96651 * region-model.cc (region_model::called_from_main_p): New. (region_model::get_store_value): Move handling for globals into... (region_model::get_initial_value_for_global): ...this new function, and add logic for extracting values from decl initializers. * region-model.h (decl_region::get_svalue_for_constructor): New decl. (decl_region::get_svalue_for_initializer): New decl. (region_model::called_from_main_p): New decl. (region_model::get_initial_value_for_global): New. * region.cc (decl_region::maybe_get_constant_value): Move logic for getting an svalue from a CONSTRUCTOR node to... (decl_region::get_svalue_for_constructor): ...this new function. (decl_region::get_svalue_for_initializer): New. * store.cc (get_svalue_for_ctor_val): Rewrite in terms of region_model::get_rvalue. * store.h (binding_cluster::get_map): New accessor. gcc/testsuite/ChangeLog: PR analyzer/96651 * gcc.dg/analyzer/pr96651-1.c: New test. * gcc.dg/analyzer/pr96651-2.c: New test. |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
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| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| liboffloadmic | ||
| libphobos | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
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| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
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| ABOUT-NLS | ||
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| configure | ||
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| COPYING3 | ||
| COPYING3.LIB | ||
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| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
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