53ba8d6695
implement very basic propapgation of return value ranges from VRP pass. This helps std::vector's push_back since we work out value range of allocated block. This propagates only within single translation unit. I hoped we will also do the propagation at WPA stage, but that needs more work on ipa-cp side. I also added code auto-detecting return_nonnull and corresponding -Wsuggest-attribute. gcc/ChangeLog: * cgraph.cc (add_detected_attribute_1): New function. (cgraph_node::add_detected_attribute): Likewise. * cgraph.h (cgraph_node::add_detected_attribute): Declare. * common.opt: Add -Wsuggest-attribute=returns_nonnull. * doc/invoke.texi: Document new flag. * gimple-range-fold.cc (fold_using_range::range_of_call): Use known reutrn value ranges. * ipa-prop.cc (struct ipa_return_value_summary): New type. (class ipa_return_value_sum_t): New type. (ipa_return_value_sum): New summary. (ipa_record_return_value_range): New function. (ipa_return_value_range): New function. * ipa-prop.h (ipa_return_value_range): Declare. (ipa_record_return_value_range): Declare. * ipa-pure-const.cc (warn_function_returns_nonnull): New funcion. * ipa-utils.h (warn_function_returns_nonnull): Declare. * symbol-summary.h: Fix comment. * tree-vrp.cc (execute_ranger_vrp): Record return values. gcc/testsuite/ChangeLog: * g++.dg/ipa/devirt-2.C: Add noipa attribute to prevent ipa-vrp. * g++.dg/ipa/devirt-7.C: Disable ipa-vrp. * g++.dg/ipa/ipa-icf-2.C: Disable ipa-vrp. * g++.dg/ipa/ipa-icf-3.C: Disable ipa-vrp. * g++.dg/ipa/ivinline-1.C: Disable ipa-vrp. * g++.dg/ipa/ivinline-3.C: Disable ipa-vrp. * g++.dg/ipa/ivinline-5.C: Disable ipa-vrp. * g++.dg/ipa/ivinline-8.C: Disable ipa-vrp. * g++.dg/ipa/nothrow-1.C: Disable ipa-vrp. * g++.dg/ipa/pure-const-1.C: Disable ipa-vrp. * g++.dg/ipa/pure-const-2.C: Disable ipa-vrp. * g++.dg/lto/inline-crossmodule-1_0.C: Disable ipa-vrp. * gcc.c-torture/compile/pr106433.c: Add noipa attribute to prevent ipa-vrp. * gcc.c-torture/execute/frame-address.c: Likewise. * gcc.dg/vla-1.c: Add noipa attribute to prevent ipa-vrp. * gcc.dg/ipa/fopt-info-inline-1.c: Disable ipa-vrp. * gcc.dg/ipa/ipa-icf-25.c: Disable ipa-vrp. * gcc.dg/ipa/ipa-icf-38.c: Disable ipa-vrp. * gcc.dg/ipa/pure-const-1.c: Disable ipa-vrp. * gcc.dg/ipa/remref-0.c: Add noipa attribute to prevent ipa-vrp. * gcc.dg/tree-prof/time-profiler-1.c: Disable ipa-vrp. * gcc.dg/tree-prof/time-profiler-2.c: Disable ipa-vrp. * gcc.dg/tree-ssa/pr110269.c: Disable ipa-vrp. * gcc.dg/tree-ssa/pr20701.c: Disable ipa-vrp. * gcc.dg/tree-ssa/vrp05.c: Disable ipa-vrp. * gcc.dg/tree-ssa/return-value-range-1.c: New test. |
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