From 38e1002657828150b2cda9f80c1f752184286e80 Mon Sep 17 00:00:00 2001 From: Marek Polacek Date: Wed, 19 Feb 2020 15:59:33 -0500 Subject: [PATCH] c++: Fix value-init crash in template [PR93676] Since we attempt to value-initialize in build_vec_init even when there's no initializer but the type has a constexpr default constructor. But build_value_init doesn't work in templates, and build_vec_init creates a lot of garbage that would not be used anyway, so don't call it in a template. PR c++/93676 - value-init crash in template. * init.c (build_new_1): Don't call build_vec_init in a template. * g++.dg/cpp0x/nsdmi-template19.C: New test. --- gcc/cp/ChangeLog | 5 +++++ gcc/cp/init.c | 8 ++++++-- gcc/testsuite/ChangeLog | 5 +++++ gcc/testsuite/g++.dg/cpp0x/nsdmi-template19.C | 13 +++++++++++++ 4 files changed, 29 insertions(+), 2 deletions(-) create mode 100644 gcc/testsuite/g++.dg/cpp0x/nsdmi-template19.C diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index 5ba298fe5e9..d34730c6ec1 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,8 @@ +2020-02-26 Marek Polacek + + PR c++/93676 - value-init crash in template. + * init.c (build_new_1): Don't call build_vec_init in a template. + 2020-02-26 Marek Polacek PR c++/93862 - ICE with static_cast when converting from int[]. diff --git a/gcc/cp/init.c b/gcc/cp/init.c index d480660445e..61ed3aa7e93 100644 --- a/gcc/cp/init.c +++ b/gcc/cp/init.c @@ -3511,13 +3511,17 @@ build_new_1 (vec **placement, tree type, tree nelts, explicit_value_init_p = true; } - if (processing_template_decl && explicit_value_init_p) + if (processing_template_decl) { + /* Avoid an ICE when converting to a base in build_simple_base_path. + We'll throw this all away anyway, and build_new will create + a NEW_EXPR. */ + tree t = fold_convert (build_pointer_type (elt_type), data_addr); /* build_value_init doesn't work in templates, and we don't need the initializer anyway since we're going to throw it away and rebuild it at instantiation time, so just build up a single constructor call to get any appropriate diagnostics. */ - init_expr = cp_build_fold_indirect_ref (data_addr); + init_expr = cp_build_fold_indirect_ref (t); if (type_build_ctor_call (elt_type)) init_expr = build_special_member_call (init_expr, complete_ctor_identifier, diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 08146db0ced..572989b2c7a 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2020-02-26 Marek Polacek + + PR c++/93676 - value-init crash in template. + * g++.dg/cpp0x/nsdmi-template19.C: New test. + 2020-02-26 Marek Polacek PR c++/93862 - ICE with static_cast when converting from int[]. diff --git a/gcc/testsuite/g++.dg/cpp0x/nsdmi-template19.C b/gcc/testsuite/g++.dg/cpp0x/nsdmi-template19.C new file mode 100644 index 00000000000..f3e2cb87fd6 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/nsdmi-template19.C @@ -0,0 +1,13 @@ +// PR c++/93676 - value-init crash in template. +// { dg-do compile { target c++11 } } + +struct P { + int x = 0; +}; + +template +struct S { + S() { new P[2][2]; } +}; + +S s; -- 2.30.2