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[59.102.120.25]) by smtp.gmail.com with ESMTPSA id me14-20020a17090b17ce00b002630bfd35b0sm7246618pjb.7.2023.06.30.20.28.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jun 2023 20:28:44 -0700 (PDT) Date: Sat, 1 Jul 2023 13:28:34 +1000 To: gcc-patches@gcc.gnu.org Cc: Patrick Palka Subject: [PATCH v3 1/3] c++: Track lifetimes in constant evaluation [PR70331,PR96630,PR98675] Message-ID: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Nathaniel Shead via Gcc-patches From: Nathaniel Shead Reply-To: Nathaniel Shead Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Sender: "Gcc-patches" This adds rudimentary lifetime tracking in C++ constexpr contexts, allowing the compiler to report errors with using values after their backing has gone out of scope. We don't yet handle other ways of accessing values outside their lifetime (e.g. following explicit destructor calls). PR c++/96630 PR c++/98675 PR c++/70331 gcc/cp/ChangeLog: * constexpr.cc (constexpr_global_ctx::remove_value): Mark value as outside lifetime. (find_expired_values): New function. (outside_lifetime_error): New function. (cxx_eval_call_expression): Don't cache calls that return references to values outside their lifetime. (cxx_eval_constant_expression): Add checks for out-of-lifetime values. Forget local variables at end of bind expressions, and temporaries after cleanup points. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/constexpr-lifetime1.C: New test. * g++.dg/cpp1y/constexpr-lifetime2.C: New test. * g++.dg/cpp1y/constexpr-lifetime3.C: New test. * g++.dg/cpp1y/constexpr-lifetime4.C: New test. * g++.dg/cpp1y/constexpr-lifetime5.C: New test. Signed-off-by: Nathaniel Shead --- gcc/cp/constexpr.cc | 112 ++++++++++++++---- .../g++.dg/cpp1y/constexpr-lifetime1.C | 13 ++ .../g++.dg/cpp1y/constexpr-lifetime2.C | 20 ++++ .../g++.dg/cpp1y/constexpr-lifetime3.C | 13 ++ .../g++.dg/cpp1y/constexpr-lifetime4.C | 11 ++ .../g++.dg/cpp1y/constexpr-lifetime5.C | 11 ++ 6 files changed, 160 insertions(+), 20 deletions(-) create mode 100644 gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc index cca0435bafc..bc59b4aab67 100644 --- a/gcc/cp/constexpr.cc +++ b/gcc/cp/constexpr.cc @@ -1165,6 +1165,8 @@ public: hash_set *modifiable; /* Number of heap VAR_DECL deallocations. */ unsigned heap_dealloc_count; + /* Values that are not within their lifetime. */ + hash_set outside_lifetime; /* Constructor. */ constexpr_global_ctx () : constexpr_ops_count (0), cleanups (NULL), modifiable (nullptr), @@ -1188,7 +1190,12 @@ public: if (!already_in_map && modifiable) modifiable->add (t); } - void remove_value (tree t) { values.remove (t); } + void remove_value (tree t) + { + if (DECL_P (t)) + outside_lifetime.add (t); + values.remove (t); + } }; /* Helper class for constexpr_global_ctx. In some cases we want to avoid @@ -2509,6 +2516,22 @@ cxx_eval_dynamic_cast_fn (const constexpr_ctx *ctx, tree call, return cp_build_addr_expr (obj, complain); } +/* Look for expired values in the expression *TP, called through + cp_walk_tree. DATA is ctx->global->outside_lifetime. */ + +static tree +find_expired_values (tree *tp, int *walk_subtrees, void *data) +{ + hash_set *outside_lifetime = (hash_set *) data; + + if (TYPE_P (*tp)) + *walk_subtrees = 0; + else if (outside_lifetime->contains (*tp)) + return *tp; + + return NULL_TREE; +} + /* Data structure used by replace_decl and replace_decl_r. */ struct replace_decl_data @@ -3160,10 +3183,7 @@ cxx_eval_call_expression (const constexpr_ctx *ctx, tree t, for (tree save_expr : save_exprs) ctx->global->remove_value (save_expr); - /* Remove the parms/result from the values map. Is it worth - bothering to do this when the map itself is only live for - one constexpr evaluation? If so, maybe also clear out - other vars from call, maybe in BIND_EXPR handling? */ + /* Remove the parms/result from the values map. */ ctx->global->remove_value (res); for (tree parm = parms; parm; parm = TREE_CHAIN (parm)) ctx->global->remove_value (parm); @@ -3210,13 +3230,20 @@ cxx_eval_call_expression (const constexpr_ctx *ctx, tree t, cacheable = false; } - /* Rewrite all occurrences of the function's RESULT_DECL with the - current object under construction. */ - if (!*non_constant_p && ctx->object - && CLASS_TYPE_P (TREE_TYPE (res)) - && !is_empty_class (TREE_TYPE (res))) - if (replace_decl (&result, res, ctx->object)) - cacheable = false; + /* Also don't cache a call if we return a pointer to an expired + value. */ + if (cacheable && (cp_walk_tree_without_duplicates + (&result, find_expired_values, + &ctx->global->outside_lifetime))) + cacheable = false; + + /* Rewrite all occurrences of the function's RESULT_DECL with the + current object under construction. */ + if (!*non_constant_p && ctx->object + && CLASS_TYPE_P (TREE_TYPE (res)) + && !is_empty_class (TREE_TYPE (res))) + if (replace_decl (&result, res, ctx->object)) + cacheable = false; } else /* Couldn't get a function copy to evaluate. */ @@ -5687,6 +5714,25 @@ cxx_eval_indirect_ref (const constexpr_ctx *ctx, tree t, return r; } +/* Complain about R, a DECL that is accessed outside its lifetime. */ + +static void +outside_lifetime_error (location_t loc, tree r) +{ + if (DECL_NAME (r) == heap_deleted_identifier) + { + /* Provide a more accurate message for deleted variables. */ + error_at (loc, "use of allocated storage after deallocation " + "in a constant expression"); + inform (DECL_SOURCE_LOCATION (r), "allocated here"); + } + else + { + error_at (loc, "accessing object outside its lifetime"); + inform (DECL_SOURCE_LOCATION (r), "declared here"); + } +} + /* Complain about R, a VAR_DECL, not being usable in a constant expression. FUNDEF_P is true if we're checking a constexpr function body. Shared between potential_constant_expression and @@ -7054,6 +7100,13 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, r = build_constructor (TREE_TYPE (t), NULL); TREE_CONSTANT (r) = true; } + else if (ctx->global->outside_lifetime.contains (t)) + { + if (!ctx->quiet) + outside_lifetime_error (loc, t); + *non_constant_p = true; + break; + } else if (ctx->strict) r = decl_really_constant_value (t, /*unshare_p=*/false); else @@ -7085,7 +7138,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, case PARM_DECL: if (lval && !TYPE_REF_P (TREE_TYPE (t))) /* glvalue use. */; - else if (tree v = ctx->global->get_value (r)) + else if (tree v = ctx->global->get_value (t)) r = v; else if (lval) /* Defer in case this is only used for its type. */; @@ -7099,7 +7152,12 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, else { if (!ctx->quiet) - error ("%qE is not a constant expression", t); + { + if (ctx->global->outside_lifetime.contains (t)) + outside_lifetime_error (loc, t); + else + error_at (loc, "%qE is not a constant expression", t); + } *non_constant_p = true; } break; @@ -7328,17 +7386,28 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, auto_vec cleanups; vec *prev_cleanups = ctx->global->cleanups; ctx->global->cleanups = &cleanups; - r = cxx_eval_constant_expression (ctx, TREE_OPERAND (t, 0), + + auto_vec save_exprs; + constexpr_ctx new_ctx = *ctx; + new_ctx.save_exprs = &save_exprs; + + r = cxx_eval_constant_expression (&new_ctx, TREE_OPERAND (t, 0), lval, non_constant_p, overflow_p, jump_target); + ctx->global->cleanups = prev_cleanups; unsigned int i; tree cleanup; /* Evaluate the cleanups. */ FOR_EACH_VEC_ELT_REVERSE (cleanups, i, cleanup) - cxx_eval_constant_expression (ctx, cleanup, vc_discard, + cxx_eval_constant_expression (&new_ctx, cleanup, vc_discard, non_constant_p, overflow_p); + + /* Forget SAVE_EXPRs and TARGET_EXPRs created by this + full-expression. */ + for (tree save_expr : save_exprs) + ctx->global->remove_value (save_expr); } break; @@ -7855,10 +7924,13 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, non_constant_p, overflow_p, jump_target); case BIND_EXPR: - return cxx_eval_constant_expression (ctx, BIND_EXPR_BODY (t), - lval, - non_constant_p, overflow_p, - jump_target); + r = cxx_eval_constant_expression (ctx, BIND_EXPR_BODY (t), + lval, + non_constant_p, overflow_p, + jump_target); + for (tree decl = BIND_EXPR_VARS (t); decl; decl = DECL_CHAIN (decl)) + ctx->global->remove_value (decl); + return r; case PREINCREMENT_EXPR: case POSTINCREMENT_EXPR: diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C new file mode 100644 index 00000000000..43aa7c974c1 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C @@ -0,0 +1,13 @@ +// PR c++/96630 +// { dg-do compile { target c++14 } } + +struct S { + int x = 0; + constexpr const int& get() const { return x; } +}; + +constexpr const int& test() { + auto local = S{}; // { dg-message "note: declared here" } + return local.get(); +} +constexpr int x = test(); // { dg-error "accessing object outside its lifetime" } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C new file mode 100644 index 00000000000..22cd919fcda --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C @@ -0,0 +1,20 @@ +// PR c++/98675 +// { dg-do compile { target c++14 } } + +struct S { + int x = 0; + constexpr const int& get() const { return x; } +}; + +constexpr int error() { + const auto& local = S{}.get(); // { dg-message "note: declared here" } + return local; +} +constexpr int x = error(); // { dg-error "accessing object outside its lifetime" } + +constexpr int ok() { + // temporary should only be destroyed after end of full-expression + auto local = S{}.get(); + return local; +} +constexpr int y = ok(); diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C new file mode 100644 index 00000000000..6329f8cf6c6 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C @@ -0,0 +1,13 @@ +// PR c++/70331 +// { dg-do compile { target c++14 } } + +constexpr int f(int i) { + int *p = &i; + if (i == 0) { + int j = 123; // { dg-message "note: declared here" } + p = &j; + } + return *p; +} + +constexpr int i = f(0); // { dg-error "accessing object outside its lifetime" } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C new file mode 100644 index 00000000000..181a1201663 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C @@ -0,0 +1,11 @@ +// { dg-do compile { target c++14 } } + +constexpr const double& test() { + const double& local = 3.0; // { dg-message "note: declared here" } + return local; +} + +static_assert(test() == 3.0, ""); // { dg-error "constant|accessing object outside its lifetime" } + +// no deference, shouldn't error +static_assert((test(), true), ""); diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C new file mode 100644 index 00000000000..a4bc71d890a --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C @@ -0,0 +1,11 @@ +// { dg-do compile { target c++14 } } +// { dg-options "-Wno-return-local-addr" } + +constexpr const int& id(int x) { return x; } + +constexpr bool test() { + const int& y = id(3); + return y == 3; +} + +constexpr bool x = test(); // { dg-error "" } From patchwork Sat Jul 1 03:30:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathaniel Shead X-Patchwork-Id: 1802183 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gcc.gnu.org header.i=@gcc.gnu.org header.a=rsa-sha256 header.s=default header.b=nZwIDeoO; dkim-atps=neutral Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4QtHl00YWpz20ZC for ; 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[59.102.120.25]) by smtp.gmail.com with ESMTPSA id 18-20020a17090a035200b00262fc689d50sm9025696pjf.4.2023.06.30.20.30.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jun 2023 20:30:10 -0700 (PDT) Date: Sat, 1 Jul 2023 13:30:00 +1000 To: gcc-patches@gcc.gnu.org Cc: Patrick Palka Subject: [PATCH v3 2/3] c++: Improve constexpr error for dangling local variables Message-ID: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Nathaniel Shead via Gcc-patches From: Nathaniel Shead Reply-To: Nathaniel Shead Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Sender: "Gcc-patches" Currently, when typeck discovers that a return statement will refer to a local variable it rewrites to return a null pointer. This causes the error messages for using the return value in a constant expression to be unhelpful, especially for reference return values. This patch removes this "optimisation". Relying on this raises a warning by default and causes UB anyway, so there should be no issue in doing so. We also suppress additional warnings from later passes that detect this as a dangling pointer, since we've already indicated this anyway. gcc/cp/ChangeLog: * semantics.cc (finish_return_stmt): Suppress dangling pointer reporting on return statement if already reported. * typeck.cc (check_return_expr): Don't set return expression to zero for dangling addresses. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/constexpr-lifetime5.C: Test reported message is correct. * g++.dg/warn/Wreturn-local-addr-6.C: Remove check for return value optimisation. Signed-off-by: Nathaniel Shead --- gcc/cp/semantics.cc | 5 ++++- gcc/cp/typeck.cc | 5 +++-- gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C | 4 ++-- gcc/testsuite/g++.dg/warn/Wreturn-local-addr-6.C | 3 --- 4 files changed, 9 insertions(+), 8 deletions(-) diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc index 8fb47fd179e..107407de513 100644 --- a/gcc/cp/semantics.cc +++ b/gcc/cp/semantics.cc @@ -1260,7 +1260,10 @@ finish_return_stmt (tree expr) r = build_stmt (input_location, RETURN_EXPR, expr); if (no_warning) - suppress_warning (r, OPT_Wreturn_type); + { + suppress_warning (r, OPT_Wreturn_type); + suppress_warning (r, OPT_Wdangling_pointer_); + } r = maybe_cleanup_point_expr_void (r); r = add_stmt (r); diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc index 859b133a18d..47233b3b717 100644 --- a/gcc/cp/typeck.cc +++ b/gcc/cp/typeck.cc @@ -11273,8 +11273,9 @@ check_return_expr (tree retval, bool *no_warning) else if (!processing_template_decl && maybe_warn_about_returning_address_of_local (retval, loc) && INDIRECT_TYPE_P (valtype)) - retval = build2 (COMPOUND_EXPR, TREE_TYPE (retval), retval, - build_zero_cst (TREE_TYPE (retval))); + /* Suppress the Wdangling-pointer warning in the return statement + that would otherwise occur. */ + *no_warning = true; } /* A naive attempt to reduce the number of -Wdangling-reference false diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C index a4bc71d890a..ad3ef579f63 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C @@ -1,11 +1,11 @@ // { dg-do compile { target c++14 } } // { dg-options "-Wno-return-local-addr" } -constexpr const int& id(int x) { return x; } +constexpr const int& id(int x) { return x; } // { dg-message "note: declared here" } constexpr bool test() { const int& y = id(3); return y == 3; } -constexpr bool x = test(); // { dg-error "" } +constexpr bool x = test(); // { dg-error "accessing object outside its lifetime" } diff --git a/gcc/testsuite/g++.dg/warn/Wreturn-local-addr-6.C b/gcc/testsuite/g++.dg/warn/Wreturn-local-addr-6.C index fae8b7e766f..ec8e241d83e 100644 --- a/gcc/testsuite/g++.dg/warn/Wreturn-local-addr-6.C +++ b/gcc/testsuite/g++.dg/warn/Wreturn-local-addr-6.C @@ -24,6 +24,3 @@ return_addr_local_as_intref (void) return (const intptr_t&)a; // { dg-warning "\\\[-Wreturn-local-addr]" } */ } - -/* Verify that the return value has been replaced with zero: - { dg-final { scan-tree-dump-times "return 0;" 2 "optimized" } } */ From patchwork Sat Jul 1 03:30:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathaniel Shead X-Patchwork-Id: 1802184 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gcc.gnu.org header.i=@gcc.gnu.org header.a=rsa-sha256 header.s=default header.b=XPhSyO2s; dkim-atps=neutral Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4QtHlv5ZkQz20ZC for ; 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[59.102.120.25]) by smtp.gmail.com with ESMTPSA id g11-20020a170902740b00b001ae5cc15655sm11388516pll.5.2023.06.30.20.30.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jun 2023 20:30:47 -0700 (PDT) Date: Sat, 1 Jul 2023 13:30:37 +1000 To: gcc-patches@gcc.gnu.org Cc: Patrick Palka Subject: [PATCH v3 3/3] c++: Improve location information in constant evaluation Message-ID: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE, URI_HEX autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Nathaniel Shead via Gcc-patches From: Nathaniel Shead Reply-To: Nathaniel Shead Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Sender: "Gcc-patches" This patch updates 'input_location' during constant evaluation to ensure that errors in subexpressions that lack location information still provide accurate diagnostics. By itself this change causes some small regressions in diagnostic quality for circumstances where errors used 'input_location' but the location of the parent subexpression doesn't make sense, so this patch also includes a couple of other small diagnostic improvements to improve the most egregious cases. gcc/cp/ChangeLog: * constexpr.cc (modifying_const_object_error): Find the source location of the const object's declaration. (cxx_eval_store_expression): Fall back to the location of the target object when evaluating initialiser. (cxx_eval_constant_expression): Update input_location to the location of the currently evaluated expression. libstdc++-v3/ChangeLog: * testsuite/25_algorithms/equal/constexpr_neg.cc: Update diagnostic locations. * testsuite/26_numerics/gcd/105844.cc: Likewise. * testsuite/26_numerics/lcm/105844.cc: Likewise. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/constexpr-48089.C: Update diagnostic locations. * g++.dg/cpp0x/constexpr-70323.C: Likewise. * g++.dg/cpp0x/constexpr-70323a.C: Likewise. * g++.dg/cpp0x/constexpr-delete2.C: Likewise. * g++.dg/cpp0x/constexpr-diag3.C: Likewise. * g++.dg/cpp0x/constexpr-ice20.C: Likewise. * g++.dg/cpp0x/constexpr-recursion.C: Likewise. * g++.dg/cpp0x/overflow1.C: Likewise. * g++.dg/cpp1y/constexpr-89285.C: Likewise. * g++.dg/cpp1y/constexpr-89481.C: Likewise. * g++.dg/cpp1y/constexpr-lifetime1.C: Likewise. * g++.dg/cpp1y/constexpr-lifetime2.C: Likewise. * g++.dg/cpp1y/constexpr-lifetime3.C: Likewise. * g++.dg/cpp1y/constexpr-lifetime4.C: Likewise. * g++.dg/cpp1y/constexpr-lifetime5.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const14.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const16.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const18.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const19.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const21.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const22.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const3.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const4.C: Likewise. * g++.dg/cpp1y/constexpr-tracking-const7.C: Likewise. * g++.dg/cpp1y/constexpr-union5.C: Likewise. * g++.dg/cpp1y/pr68180.C: Likewise. * g++.dg/cpp1z/constexpr-lambda6.C: Likewise. * g++.dg/cpp1z/constexpr-lambda8.C: Likewise. * g++.dg/cpp2a/bit-cast11.C: Likewise. * g++.dg/cpp2a/bit-cast12.C: Likewise. * g++.dg/cpp2a/bit-cast14.C: Likewise. * g++.dg/cpp2a/constexpr-98122.C: Likewise. * g++.dg/cpp2a/constexpr-dynamic17.C: Likewise. * g++.dg/cpp2a/constexpr-init1.C: Likewise. * g++.dg/cpp2a/constexpr-new12.C: Likewise. * g++.dg/cpp2a/constexpr-new3.C: Likewise. * g++.dg/cpp2a/constinit10.C: Likewise. * g++.dg/cpp2a/is-corresponding-member4.C: Likewise. * g++.dg/ext/constexpr-vla2.C: Likewise. * g++.dg/ext/constexpr-vla3.C: Likewise. * g++.dg/ubsan/pr63956.C: Likewise. Signed-off-by: Nathaniel Shead --- gcc/cp/constexpr.cc | 46 ++++++++++++++++++- gcc/testsuite/g++.dg/cpp0x/constexpr-48089.C | 10 ++-- gcc/testsuite/g++.dg/cpp0x/constexpr-70323.C | 8 ++-- gcc/testsuite/g++.dg/cpp0x/constexpr-70323a.C | 8 ++-- .../g++.dg/cpp0x/constexpr-delete2.C | 5 +- gcc/testsuite/g++.dg/cpp0x/constexpr-diag3.C | 2 +- gcc/testsuite/g++.dg/cpp0x/constexpr-ice20.C | 1 + .../g++.dg/cpp0x/constexpr-recursion.C | 6 +-- gcc/testsuite/g++.dg/cpp0x/overflow1.C | 2 +- gcc/testsuite/g++.dg/cpp1y/constexpr-89285.C | 5 +- gcc/testsuite/g++.dg/cpp1y/constexpr-89481.C | 3 +- .../g++.dg/cpp1y/constexpr-lifetime1.C | 1 + .../g++.dg/cpp1y/constexpr-lifetime2.C | 4 +- .../g++.dg/cpp1y/constexpr-lifetime3.C | 4 +- .../g++.dg/cpp1y/constexpr-lifetime4.C | 2 +- .../g++.dg/cpp1y/constexpr-lifetime5.C | 4 +- .../g++.dg/cpp1y/constexpr-tracking-const14.C | 3 +- .../g++.dg/cpp1y/constexpr-tracking-const16.C | 3 +- .../g++.dg/cpp1y/constexpr-tracking-const18.C | 4 +- .../g++.dg/cpp1y/constexpr-tracking-const19.C | 4 +- .../g++.dg/cpp1y/constexpr-tracking-const21.C | 4 +- .../g++.dg/cpp1y/constexpr-tracking-const22.C | 4 +- .../g++.dg/cpp1y/constexpr-tracking-const3.C | 3 +- .../g++.dg/cpp1y/constexpr-tracking-const4.C | 3 +- .../g++.dg/cpp1y/constexpr-tracking-const7.C | 3 +- gcc/testsuite/g++.dg/cpp1y/constexpr-union5.C | 4 +- gcc/testsuite/g++.dg/cpp1y/pr68180.C | 4 +- .../g++.dg/cpp1z/constexpr-lambda6.C | 4 +- .../g++.dg/cpp1z/constexpr-lambda8.C | 5 +- gcc/testsuite/g++.dg/cpp2a/bit-cast11.C | 10 ++-- gcc/testsuite/g++.dg/cpp2a/bit-cast12.C | 10 ++-- gcc/testsuite/g++.dg/cpp2a/bit-cast14.C | 14 +++--- gcc/testsuite/g++.dg/cpp2a/constexpr-98122.C | 4 +- .../g++.dg/cpp2a/constexpr-dynamic17.C | 5 +- gcc/testsuite/g++.dg/cpp2a/constexpr-init1.C | 5 +- gcc/testsuite/g++.dg/cpp2a/constexpr-new12.C | 6 +-- gcc/testsuite/g++.dg/cpp2a/constexpr-new3.C | 10 ++-- gcc/testsuite/g++.dg/cpp2a/constinit10.C | 5 +- .../g++.dg/cpp2a/is-corresponding-member4.C | 4 +- gcc/testsuite/g++.dg/ext/constexpr-vla2.C | 4 +- gcc/testsuite/g++.dg/ext/constexpr-vla3.C | 4 +- gcc/testsuite/g++.dg/ubsan/pr63956.C | 23 +++++----- .../25_algorithms/equal/constexpr_neg.cc | 7 +-- .../testsuite/26_numerics/gcd/105844.cc | 10 ++-- .../testsuite/26_numerics/lcm/105844.cc | 14 +++--- 45 files changed, 170 insertions(+), 124 deletions(-) diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc index bc59b4aab67..0b8697b4a85 100644 --- a/gcc/cp/constexpr.cc +++ b/gcc/cp/constexpr.cc @@ -2165,7 +2165,33 @@ modifying_const_object_error (tree expr, tree obj) auto_diagnostic_group d; error_at (loc, "modifying a const object %qE is not allowed in " "a constant expression", TREE_OPERAND (expr, 0)); - inform (location_of (obj), "originally declared % here"); + + /* Find the underlying object that was declared as const. */ + location_t decl_loc = UNKNOWN_LOCATION; + for (tree probe = obj; decl_loc == UNKNOWN_LOCATION; ) + switch (TREE_CODE (probe)) + { + case BIT_FIELD_REF: + case COMPONENT_REF: + { + tree elt = TREE_OPERAND (probe, 1); + if (CP_TYPE_CONST_P (TREE_TYPE (elt))) + decl_loc = DECL_SOURCE_LOCATION (elt); + probe = TREE_OPERAND (probe, 0); + } + break; + + case ARRAY_REF: + case REALPART_EXPR: + case IMAGPART_EXPR: + probe = TREE_OPERAND (probe, 0); + break; + + default: + decl_loc = location_of (probe); + break; + } + inform (decl_loc, "originally declared % here"); } /* Return true if FNDECL is a replaceable global allocation function that @@ -6286,6 +6312,21 @@ cxx_eval_store_expression (const constexpr_ctx *ctx, tree t, if (TREE_CODE (init) == TARGET_EXPR) if (tree tinit = TARGET_EXPR_INITIAL (init)) init = tinit; + + /* Improve error messages for initialisers when the initialising + expression has no location information by pointing to the decl + that is getting initialised. */ + location_t target_loc = cp_expr_loc_or_input_loc (init); + if (!EXPR_HAS_LOCATION (init)) + { + if (DECL_P (target)) + target_loc = DECL_SOURCE_LOCATION (target); + else if (TREE_CODE (target) == COMPONENT_REF + || TREE_CODE (target) == BIT_FIELD_REF) + target_loc = DECL_SOURCE_LOCATION (TREE_OPERAND (target, 1)); + } + iloc_sentinel sentinel = target_loc; + init = cxx_eval_constant_expression (&new_ctx, init, vc_prvalue, non_constant_p, overflow_p); /* The hash table might have moved since the get earlier, and the @@ -6986,7 +7027,10 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, return t; } + /* Change the input location to the currently processed expression for + better error messages when a subexpression has no location. */ location_t loc = cp_expr_loc_or_input_loc (t); + iloc_sentinel sentinel (loc); STRIP_ANY_LOCATION_WRAPPER (t); diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-48089.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-48089.C index 4574eb83ff7..11630f26ffe 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-48089.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-48089.C @@ -10,11 +10,11 @@ // R() is well-formed because i is initialized before j. struct s { - constexpr s() : v(v) { } + constexpr s() : v(v) { } // { dg-error "accessing uninitialized member" } int v; }; -constexpr s bang; // { dg-error "|" } +constexpr s bang; // { dg-message "in .constexpr. expansion" } struct R { int i,j; @@ -26,14 +26,14 @@ constexpr R r; // { dg-bogus "" } // Ill-formed (no diagnostic required) struct T { int i; - constexpr int f() { return i; } + constexpr int f() { return i; } // { dg-error "accessing uninitialized member" } constexpr T(): i(0) { } - constexpr T(const T& t) : i(f()) { } // { dg-message "" } + constexpr T(const T& t) : i(f()) { } // { dg-message "in .constexpr. expansion" } }; constexpr T t1; // Ill-formed (diagnostic required) -constexpr T t2(t1); // { dg-message "" } +constexpr T t2(t1); // { dg-message "in .constexpr. expansion" } // Well-formed struct U { diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-70323.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-70323.C index 272a225d967..bfb185f2fb5 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-70323.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-70323.C @@ -1,10 +1,10 @@ // PR c++/70323 // { dg-do compile { target c++11 } } -constexpr int overflow_if_0 (int i) { return __INT_MAX__ + !i; } -constexpr int overflow_if_1 (int i) { return __INT_MAX__ + i; } +constexpr int overflow_if_0 (int i) { return __INT_MAX__ + !i; } // { dg-error "overflow in constant expression" } +constexpr int overflow_if_1 (int i) { return __INT_MAX__ + i; } // { dg-error "overflow in constant expression" } -constexpr bool i0_0 = overflow_if_0 (0); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr bool i0_0 = overflow_if_0 (0); // { dg-message "in .constexpr. expansion of " } constexpr bool i0_1 = overflow_if_0 (1); constexpr bool i1_0 = overflow_if_1 (0); -constexpr bool i1_1 = overflow_if_1 (1); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr bool i1_1 = overflow_if_1 (1); // { dg-message "in .constexpr. expansion of " } diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-70323a.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-70323a.C index 1990ab6be2d..b5ed581e1c8 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-70323a.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-70323a.C @@ -2,10 +2,10 @@ // { dg-do compile { target c++11 } } // { dg-options "-Wall" } -constexpr int overflow_if_0 (int i) { return __INT_MAX__ + !i; } -constexpr int overflow_if_1 (int i) { return __INT_MAX__ + i; } +constexpr int overflow_if_0 (int i) { return __INT_MAX__ + !i; } // { dg-error "overflow in constant expression" } +constexpr int overflow_if_1 (int i) { return __INT_MAX__ + i; } // { dg-error "overflow in constant expression" } -constexpr bool i0_0 = overflow_if_0 (0); // { dg-error "overflow in constant expression|in .constexpr. expansion of" } +constexpr bool i0_0 = overflow_if_0 (0); // { dg-message "in .constexpr. expansion of" } constexpr bool i0_1 = overflow_if_0 (1); constexpr bool i1_0 = overflow_if_1 (0); -constexpr bool i1_1 = overflow_if_1 (1); // { dg-error "overflow in constant expression|in .constexpr. expansion of" } +constexpr bool i1_1 = overflow_if_1 (1); // { dg-message "in .constexpr. expansion of" } diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-delete2.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-delete2.C index 999f9b7851e..f2b6df2509c 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-delete2.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-delete2.C @@ -6,8 +6,9 @@ constexpr int f(int i) { return i; } constexpr int g(A* ap) { return f((delete[] ap, 42)); // { dg-message "" "" { target c++17_down } } + // { dg-error "" "" { target c++2a } .-1 } } A a; -constexpr int i = g(&a); // { dg-error "" } - // { dg-message "in 'constexpr' expansion of" "" { target c++2a } .-1 } +constexpr int i = g(&a); // { dg-error "" "" { target c++17_down } } + // { dg-message "in 'constexpr' expansion of" "" { target c++2a } .-1 } diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-diag3.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-diag3.C index 5eedf42ba36..50c676c56cd 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-diag3.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-diag3.C @@ -16,7 +16,7 @@ int main() struct complex // { dg-message "no .constexpr. constructor" "" { target { ! implicit_constexpr } } } { complex(double r, double i) : re(r), im(i) { } - constexpr double real() const { return re; } // { dg-error "not a literal type" "" { target c++11_only } } + constexpr double real() const { return re; } // { dg-error "not a literal type|not usable in a constant expression" "" { target { ! implicit_constexpr } } } double imag() const { return im; } private: diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-ice20.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-ice20.C index e2d4853a284..43fa9a03c14 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-ice20.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-ice20.C @@ -3,5 +3,6 @@ typedef bool (*Function)(int); constexpr bool check(int x, Function p) { return p(x); } // { dg-message "in .constexpr. expansion of" } +// { dg-error "not a constant expression" "" { target *-*-* } .-1 } static_assert(check(2, check), ""); // { dg-error "conversion|constant|in .constexpr. expansion of" } diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-recursion.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-recursion.C index 8c4201e1ec2..b00f8794d4c 100644 --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-recursion.C +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-recursion.C @@ -1,6 +1,6 @@ // Test that we catch excessive recursion. // { dg-do compile { target c++11 } } // { dg-options "-fconstexpr-depth=5" } -// { dg-prune-output "in constexpr expansion" } -constexpr int f (int i) { return f (i-1); } // { dg-message "in .constexpr. expansion of " } -constexpr int i = f(42); // { dg-error ".constexpr. evaluation depth|in .constexpr. expansion of " } +// { dg-prune-output "in .constexpr. expansion" } +constexpr int f (int i) { return f (i-1); } // { dg-error ".constexpr. evaluation depth" } +constexpr int i = f(42); diff --git a/gcc/testsuite/g++.dg/cpp0x/overflow1.C b/gcc/testsuite/g++.dg/cpp0x/overflow1.C index b8591b4af41..e295355c88f 100644 --- a/gcc/testsuite/g++.dg/cpp0x/overflow1.C +++ b/gcc/testsuite/g++.dg/cpp0x/overflow1.C @@ -4,7 +4,7 @@ template struct Fib { static const long long value // { dg-error "overflow" } - = Fib::value + Fib::value; + = Fib::value + Fib::value; // { dg-error "overflow" } }; template <> diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-89285.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-89285.C index fe0b8570ca2..d09df091fdb 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-89285.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-89285.C @@ -14,7 +14,8 @@ struct B { } }; struct C : A { - B bar {this}; + B bar {this}; // { dg-error "" "" { target c++14_down } } }; -constexpr C foo {}; // { dg-message "" } +// error path changes in C++17 due to `C` becoming an aggregate +constexpr C foo {}; // { dg-error "" "" { target c++17 } } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-89481.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-89481.C index 8ac4ef0fd36..6f8f6a8038e 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-89481.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-89481.C @@ -6,7 +6,7 @@ foo () { union U { long long a; int b[2]; } u { 5LL }; u.b[1] = 4; // { dg-error "change of the active member of a union from" "" { target c++17_down } } - return u.b[0]; + return u.b[0]; // { dg-error "accessing uninitialized array element" "" { target c++2a } } } constexpr int @@ -19,6 +19,5 @@ bar () static_assert (foo () == 0, ""); // { dg-error "non-constant condition for static assertion" } // { dg-message "in 'constexpr' expansion of" "" { target *-*-* } .-1 } - // { dg-error "accessing uninitialized array element" "" { target c++2a } .-2 } static_assert (bar () == 4, ""); // { dg-error "non-constant condition for static assertion" "" { target c++17_down } } // { dg-message "in 'constexpr' expansion of" "" { target c++17_down } .-1 } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C index 43aa7c974c1..f79f1611d5f 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime1.C @@ -11,3 +11,4 @@ constexpr const int& test() { return local.get(); } constexpr int x = test(); // { dg-error "accessing object outside its lifetime" } + diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C index 22cd919fcda..2f5ae8db6d5 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime2.C @@ -8,9 +8,9 @@ struct S { constexpr int error() { const auto& local = S{}.get(); // { dg-message "note: declared here" } - return local; + return local; // { dg-error "accessing object outside its lifetime" } } -constexpr int x = error(); // { dg-error "accessing object outside its lifetime" } +constexpr int x = error(); // { dg-message "in .constexpr. expansion" } constexpr int ok() { // temporary should only be destroyed after end of full-expression diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C index 6329f8cf6c6..53785521d05 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime3.C @@ -7,7 +7,7 @@ constexpr int f(int i) { int j = 123; // { dg-message "note: declared here" } p = &j; } - return *p; + return *p; // { dg-error "accessing object outside its lifetime" } } -constexpr int i = f(0); // { dg-error "accessing object outside its lifetime" } +constexpr int i = f(0); // { dg-message "in .constexpr. expansion" } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C index 181a1201663..4302da1eddc 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime4.C @@ -5,7 +5,7 @@ constexpr const double& test() { return local; } -static_assert(test() == 3.0, ""); // { dg-error "constant|accessing object outside its lifetime" } +static_assert(test() == 3.0, ""); // { dg-error "non-constant condition|accessing object outside its lifetime" } // no deference, shouldn't error static_assert((test(), true), ""); diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C index ad3ef579f63..a12920c8fba 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-lifetime5.C @@ -5,7 +5,7 @@ constexpr const int& id(int x) { return x; } // { dg-message "note: declared he constexpr bool test() { const int& y = id(3); - return y == 3; + return y == 3; // { dg-error "accessing object outside its lifetime" } } -constexpr bool x = test(); // { dg-error "accessing object outside its lifetime" } +constexpr bool x = test(); // { dg-message "in .constexpr. expansion" } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const14.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const14.C index 45c4fcf50be..0c77dd4934d 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const14.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const14.C @@ -14,7 +14,7 @@ struct C { struct A { int r; - const C c; + const C c; // { dg-message "originally declared" } constexpr A() : r(11) { r = 14; const_cast(c).n = 42; } // { dg-error "modifying a const object" } }; @@ -34,5 +34,4 @@ struct B { }; constexpr B b(false); // { dg-message "in .constexpr. expansion of" } -// { dg-message "originally declared" "" { target *-*-* } .-1 } static_assert(b.e.d.a.c.n == 2, ""); // { dg-error "non-constant condition" } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const16.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const16.C index 5a5b92bc8cc..b5ccf3a4ea5 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const16.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const16.C @@ -7,7 +7,7 @@ constexpr int& impl(const int (&array)[10], int index) { struct A { constexpr int& operator[](int i) { return impl(elems, i); } - const int elems[10]; + const int elems[10]; // { dg-message "originally declared" } }; constexpr bool @@ -19,4 +19,3 @@ f() } constexpr bool b = f(); // { dg-message "in .constexpr. expansion of " } -// { dg-message "originally declared" "" { target *-*-* } .-1 } diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const18.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const18.C index 11a680468c2..278628c121b 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const18.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const18.C @@ -13,11 +13,11 @@ struct array template struct S { using U = array; - const U m; + const U m; // { dg-message "originally declared" } constexpr S(int) : m{} { const_cast(const_cast(m)[0]) = 42; // { dg-error "modifying a const object" } } }; -constexpr S p = { 10 }; // { dg-message "originally declared" } +constexpr S p = { 10 }; diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const19.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const19.C index c31222ffcdd..2d18c94537b 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const19.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const19.C @@ -7,7 +7,7 @@ template struct array { constexpr const E &operator[](size_t n) const noexcept { return elems[n]; } - const E elems[N]; + const E elems[N]; // { dg-message "originally declared" } }; template @@ -20,4 +20,4 @@ struct S { } }; -constexpr S p = { 10 }; // { dg-message "originally declared" } +constexpr S p = { 10 }; diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const21.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const21.C index 0b16193398e..d3bbcb116a6 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const21.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const21.C @@ -18,11 +18,11 @@ struct array2 { template struct S { using U = array2; - const U m; + const U m; // { dg-message "originally declared" } constexpr S(int) : m{} { const_cast(m.a[0]) = 42; // { dg-error "modifying a const object" } } }; -constexpr S p = { 10 }; // { dg-message "originally declared" } +constexpr S p = { 10 }; diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const22.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const22.C index 216cf1607a4..27522f86dbd 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const22.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const22.C @@ -7,11 +7,11 @@ struct X { template struct S { - const X x; + const X x; // { dg-message "originally declared" } constexpr S(int) : x{} { const_cast(x).i = 19; // { dg-error "modifying a const object" } } }; -constexpr S p = { 10 }; // { dg-message "originally declared" } +constexpr S p = { 10 }; diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const3.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const3.C index 6853775c1e2..fc88dd05eef 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const3.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const3.C @@ -7,7 +7,7 @@ struct A { }; struct B { - const A a; + const A a; // { dg-message "originally declared" } constexpr B(bool b) { if (b) const_cast(a).n = 3; // { dg-error "modifying a const object" } @@ -18,5 +18,4 @@ constexpr B b(false); static_assert(b.a.n == 2, ""); constexpr B b2(true); // { dg-message "in .constexpr. expansion of " } -// { dg-message "originally declared" "" { target *-*-* } .-1 } static_assert((b2.a.n, 1), ""); diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const4.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const4.C index 8263a7cc505..27fede152c7 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const4.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const4.C @@ -2,7 +2,7 @@ // { dg-do compile { target c++14 } } struct A { - const int n; + const int n; // { dg-message "originally declared" } constexpr A() : n(1) { } }; struct B { @@ -13,5 +13,4 @@ struct B { } }; constexpr B b; // { dg-message "in .constexpr. expansion of " } -// { dg-message "originally declared" "" { target *-*-* } .-1 } static_assert((b.a.n, 1), ""); diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const7.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const7.C index 922e8ff126f..bea14b05602 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const7.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-tracking-const7.C @@ -3,7 +3,7 @@ struct D { int n; }; -struct C { const D d; }; +struct C { const D d; }; // { dg-message "originally declared" } struct A { C c; @@ -19,5 +19,4 @@ struct B { }; constexpr B b{}; // { dg-message "in .constexpr. expansion of " } -// { dg-message "originally declared" "" { target *-*-* } .-1 } static_assert((b.a.c.d.n, 1), ""); diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-union5.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-union5.C index 55fe9fa2f0b..3d76345d564 100644 --- a/gcc/testsuite/g++.dg/cpp1y/constexpr-union5.C +++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-union5.C @@ -8,8 +8,8 @@ union U { }; constexpr int foo(U *up) { - up->a++; + up->a++; // { dg-error "accessing uninitialized member" } return {42}; } -extern constexpr U u = {}; // { dg-error "accessing uninitialized member" } +extern constexpr U u = {}; // { dg-message "in .constexpr. expansion" } diff --git a/gcc/testsuite/g++.dg/cpp1y/pr68180.C b/gcc/testsuite/g++.dg/cpp1y/pr68180.C index 9e6e5e984f9..8de1ef3936b 100644 --- a/gcc/testsuite/g++.dg/cpp1y/pr68180.C +++ b/gcc/testsuite/g++.dg/cpp1y/pr68180.C @@ -6,11 +6,11 @@ typedef float __attribute__( ( vector_size( 16 ) ) ) float32x4_t; constexpr float32x4_t fill(float x) { float32x4_t v{0}; constexpr auto vs = sizeof(v)/sizeof(v[0]); - for (auto i=0U; i(a); + dynamic_cast(a); // { dg-error "accessing uninitialized member" } } -constexpr D d; // { dg-error "accessing uninitialized member" } -// { dg-message "in 'constexpr' expansion of" "" { target *-*-* } .-1 } +constexpr D d; // { dg-message "in 'constexpr' expansion of" } diff --git a/gcc/testsuite/g++.dg/cpp2a/constexpr-init1.C b/gcc/testsuite/g++.dg/cpp2a/constexpr-init1.C index e56ecfed48a..b4e39b6f928 100644 --- a/gcc/testsuite/g++.dg/cpp2a/constexpr-init1.C +++ b/gcc/testsuite/g++.dg/cpp2a/constexpr-init1.C @@ -52,11 +52,10 @@ constexpr int fn5 () { struct S { int a = 9; int b; } s; - return s.b; + return s.b; // { dg-error "accessing uninitialized member" } } -constexpr int b = fn5 (); // { dg-error "accessing uninitialized member" } -// { dg-message "in .constexpr. expansion of" "" { target *-*-* } .-1 } +constexpr int b = fn5 (); // { dg-message "in .constexpr. expansion of" } constexpr int fn6 () diff --git a/gcc/testsuite/g++.dg/cpp2a/constexpr-new12.C b/gcc/testsuite/g++.dg/cpp2a/constexpr-new12.C index 5a3d06a5fab..832782e1427 100644 --- a/gcc/testsuite/g++.dg/cpp2a/constexpr-new12.C +++ b/gcc/testsuite/g++.dg/cpp2a/constexpr-new12.C @@ -17,11 +17,11 @@ struct B : A { constexpr int foo () { - A *a = new B (); + A *a = new B (); // { dg-message "allocated here" } a->a = 4; delete a; - int r = a->foo (); + int r = a->foo (); // { dg-error "constant expression" } return r; } -constexpr auto a = foo (); // { dg-error "constant expression" } +constexpr auto a = foo (); // { dg-message "in .constexpr. expansion" } diff --git a/gcc/testsuite/g++.dg/cpp2a/constexpr-new3.C b/gcc/testsuite/g++.dg/cpp2a/constexpr-new3.C index 70b841208f8..3ba440fec53 100644 --- a/gcc/testsuite/g++.dg/cpp2a/constexpr-new3.C +++ b/gcc/testsuite/g++.dg/cpp2a/constexpr-new3.C @@ -45,11 +45,10 @@ constexpr bool f5 () { int *p = new int; // { dg-message "allocated here" } - return *p == 1; + return *p == 1; // { dg-error "the content of uninitialized storage is not usable in a constant expression" } } -constexpr auto v5 = f5 (); // { dg-error "the content of uninitialized storage is not usable in a constant expression" } - // { dg-message "in 'constexpr' expansion of" "" { target *-*-* } .-1 } +constexpr auto v5 = f5 (); // { dg-message "in 'constexpr' expansion of" } constexpr bool f6 () @@ -57,11 +56,10 @@ f6 () int *p = new int (2); // { dg-message "allocated here" } int *q = p; delete p; - return *q == 2; + return *q == 2; // { dg-error "use of allocated storage after deallocation in a constant expression" } } -constexpr auto v6 = f6 (); // { dg-error "use of allocated storage after deallocation in a constant expression" } - // { dg-message "in 'constexpr' expansion of" "" { target *-*-* } .-1 } +constexpr auto v6 = f6 (); // { dg-message "in 'constexpr' expansion of" } constexpr int * f7 () diff --git a/gcc/testsuite/g++.dg/cpp2a/constinit10.C b/gcc/testsuite/g++.dg/cpp2a/constinit10.C index b678788541e..d2c49c41f91 100644 --- a/gcc/testsuite/g++.dg/cpp2a/constinit10.C +++ b/gcc/testsuite/g++.dg/cpp2a/constinit10.C @@ -11,15 +11,14 @@ struct S1 struct alignas(64) S2 { constexpr S2 () - : m_tabS1() + : m_tabS1() // { dg-error "used before its definition" } {} S1 m_tabS1[7]; }; constinit S2 objX; // { dg-error ".constinit. variable .objX. does not have a constant initializer" } -// { dg-error "used before its definition" "" { target *-*-* } .-1 } -// // { dg-message "in .constexpr. expansion of" "" { target *-*-* } .-2 } +// { dg-message "in .constexpr. expansion of" "" { target *-*-* } .-1 } constexpr S1::S1 () : m_i(14) diff --git a/gcc/testsuite/g++.dg/cpp2a/is-corresponding-member4.C b/gcc/testsuite/g++.dg/cpp2a/is-corresponding-member4.C index 6b74090306b..241e9976e8c 100644 --- a/gcc/testsuite/g++.dg/cpp2a/is-corresponding-member4.C +++ b/gcc/testsuite/g++.dg/cpp2a/is-corresponding-member4.C @@ -14,8 +14,8 @@ is_corresponding_member (M1 S1::*m1, M2 S2::*m2) noexcept struct A { int a; }; struct B; constexpr int B::*n = nullptr; -constexpr auto a = std::is_corresponding_member (&A::a, n); // { dg-error "invalid use of incomplete type 'struct B'" } -constexpr auto b = std::is_corresponding_member (n, &A::a); // { dg-error "invalid use of incomplete type 'struct B'" } +constexpr auto a = std::is_corresponding_member (&A::a, n); // { dg-message "in .constexpr. expansion of" } +constexpr auto b = std::is_corresponding_member (n, &A::a); // { dg-message "in .constexpr. expansion of" } void foo (int B::*m) diff --git a/gcc/testsuite/g++.dg/ext/constexpr-vla2.C b/gcc/testsuite/g++.dg/ext/constexpr-vla2.C index d4ea7c58c0d..e09a27af3de 100644 --- a/gcc/testsuite/g++.dg/ext/constexpr-vla2.C +++ b/gcc/testsuite/g++.dg/ext/constexpr-vla2.C @@ -4,7 +4,7 @@ constexpr int fn_bad (int n) { - __extension__ int a [n] = { 0 }; + __extension__ int a [n] = { 0 }; // { dg-error "array subscript" } int z = a [0] + (n ? fn_bad (n - 1) : 0); // { dg-message "in .constexpr. expansion of " } return z; } @@ -18,4 +18,4 @@ fn_ok (int n) } constexpr int i1 = fn_ok (3); -constexpr int i2 = fn_bad (3); // { dg-error "array subscript|in .constexpr. expansion of " } +constexpr int i2 = fn_bad (3); // { dg-message "in .constexpr. expansion of " } diff --git a/gcc/testsuite/g++.dg/ext/constexpr-vla3.C b/gcc/testsuite/g++.dg/ext/constexpr-vla3.C index 538b576a825..6f9daa1897f 100644 --- a/gcc/testsuite/g++.dg/ext/constexpr-vla3.C +++ b/gcc/testsuite/g++.dg/ext/constexpr-vla3.C @@ -4,11 +4,11 @@ constexpr int foo (int n) { - __extension__ int a[n] = { 1, 2, 3, 4, 5, 6 }; + __extension__ int a[n] = { 1, 2, 3, 4, 5, 6 }; // { dg-error "array subscript" } int z = 0; for (int i = 0; i <= n; ++i) z += a[i]; return z; } -constexpr int n = foo (3); // { dg-error "array subscript|in .constexpr. expansion of " } +constexpr int n = foo (3); // { dg-message "in .constexpr. expansion of " } diff --git a/gcc/testsuite/g++.dg/ubsan/pr63956.C b/gcc/testsuite/g++.dg/ubsan/pr63956.C index 3a1596e6e2e..6fd0b4f893e 100644 --- a/gcc/testsuite/g++.dg/ubsan/pr63956.C +++ b/gcc/testsuite/g++.dg/ubsan/pr63956.C @@ -56,12 +56,13 @@ fn3 (int a, int b) { if (b != 2) a = a / b; // { dg-error "..7 / 0.. is not a constant expression" } + // { dg-error "overflow in constant expression" "" { target *-*-* } .-1 } return a; } constexpr int k1 = fn3 (8, 4); constexpr int k2 = fn3 (7, 0); // { dg-message "in .constexpr. expansion" } -constexpr int k3 = fn3 (INT_MIN, -1); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr int k3 = fn3 (INT_MIN, -1); // { dg-message "in .constexpr. expansion of " } SA (k1 == 2); @@ -100,13 +101,13 @@ constexpr int fn7 (const int *a, int b) { if (b != 3) - return fn6 (*a, b); + return fn6 (*a, b); // { dg-error "null pointer" } return 7; } constexpr int n1 = 7; constexpr int n2 = fn7 (&n1, 5); -constexpr int n3 = fn7 ((const int *) 0, 8); // { dg-error "null pointer|in .constexpr. expansion of " } +constexpr int n3 = fn7 ((const int *) 0, 8); // { dg-message "in .constexpr. expansion of " } constexpr int fn8 (int i) @@ -122,15 +123,15 @@ constexpr int fn9 (int a, int b) { if (b != 0) - return a + b; + return a + b; // { dg-error "overflow in constant expression" } return a; } constexpr int p1 = fn9 (42, 7); -constexpr int p2 = fn9 (__INT_MAX__, 1); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr int p2 = fn9 (__INT_MAX__, 1); // { dg-message "in .constexpr. expansion of " } constexpr int p3 = fn9 (__INT_MAX__, -1); constexpr int p4 = fn9 (INT_MIN, 1); -constexpr int p5 = fn9 (INT_MIN, -1); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr int p5 = fn9 (INT_MIN, -1); // { dg-message "in .constexpr. expansion of " } SA (p1 == 49); SA (p3 == __INT_MAX__ - 1); @@ -140,13 +141,13 @@ constexpr int fn10 (int a, int b) { if (b != 0) - return a * b; + return a * b; // { dg-error "overflow in constant expression" } return a; } constexpr int q1 = fn10 (10, 10); -constexpr int q2 = fn10 (__INT_MAX__, 2); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } -constexpr int q3 = fn10 (INT_MIN, 2); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr int q2 = fn10 (__INT_MAX__, 2); // { dg-message "in .constexpr. expansion of " } +constexpr int q3 = fn10 (INT_MIN, 2); // { dg-message "in .constexpr. expansion of " } constexpr int q4 = fn10 (-1, -1); SA (q1 == 100); @@ -155,14 +156,14 @@ SA (q4 == 1); constexpr int fn11 (double d) { - int i = d; + int i = d; // { dg-error "overflow in constant expression" } if (i != 0) return i; return i * 2; } constexpr int r1 = fn11 (3.4); -constexpr int r2 = fn11 (__builtin_inf ()); // { dg-error "overflow in constant expression|in .constexpr. expansion of " } +constexpr int r2 = fn11 (__builtin_inf ()); // { dg-message "in .constexpr. expansion of " } constexpr int fn12 (int i) diff --git a/libstdc++-v3/testsuite/25_algorithms/equal/constexpr_neg.cc b/libstdc++-v3/testsuite/25_algorithms/equal/constexpr_neg.cc index 34ca5c4805c..fd89ac0e166 100644 --- a/libstdc++-v3/testsuite/25_algorithms/equal/constexpr_neg.cc +++ b/libstdc++-v3/testsuite/25_algorithms/equal/constexpr_neg.cc @@ -32,7 +32,7 @@ test01() return outa; } -static_assert(test01()); // { dg-error "outside the bounds" } +static_assert(test01()); // { dg-error "non-constant condition" } constexpr bool test02() @@ -44,7 +44,8 @@ test02() return outa; } -static_assert(test02()); // { dg-error "outside the bounds" } +static_assert(test02()); // { dg-error "non-constant condition" } -// { dg-prune-output "non-constant condition" } +// Errors occuring within internals: +// { dg-error "outside the bounds of array" "" { target *-*-* } 0 } // { dg-prune-output "in 'constexpr'" } diff --git a/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc b/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc index 5b6fea7b560..bc9b29bc39d 100644 --- a/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc +++ b/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc @@ -13,9 +13,11 @@ static_assert( std::gcd(LLONG_MIN, 2ull) == 2 ); static_assert( std::gcd(2ull, LLONG_MIN) == 2 ); // But |INT_MIN| cannot be represented in common_type i.e. int. -constexpr int a = std::gcd(INT_MIN, 1); // { dg-error "overflow" } -constexpr int b = std::gcd(1, INT_MIN); // { dg-error "overflow" } +constexpr int a = std::gcd(INT_MIN, 1); // { dg-error "in .constexpr." } +constexpr int b = std::gcd(1, INT_MIN); // { dg-error "in .constexpr." } // And |LLONG_MIN| cannot be represented in long. -constexpr long long c = std::gcd(LLONG_MIN, 1); // { dg-error "overflow" } -constexpr long long d = std::gcd(1, LLONG_MIN); // { dg-error "overflow" } +constexpr long long c = std::gcd(LLONG_MIN, 1); // { dg-error "in .constexpr." } +constexpr long long d = std::gcd(1, LLONG_MIN); // { dg-error "in .constexpr." } + +// { dg-error "overflow" "" { target *-*-* } 0 } diff --git a/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc b/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc index d0e032e03e0..d853974f77e 100644 --- a/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc +++ b/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc @@ -9,14 +9,16 @@ static_assert( std::lcm(INT_MIN, 1u) == INT_MAX+1u ); static_assert( std::lcm(1u, INT_MIN) == INT_MAX+1u ); // But |INT_MIN| cannot be represented in common_type i.e. int. -constexpr int a = std::lcm(INT_MIN, 1); // { dg-error "overflow" } -constexpr int b = std::lcm(1, INT_MIN); // { dg-error "overflow" } +constexpr int a = std::lcm(INT_MIN, 1); // { dg-error "in .constexpr." } +constexpr int b = std::lcm(1, INT_MIN); // { dg-error "in .constexpr." } // And the LCM of 50000 and 49999 cannot be represented in int. -constexpr int c = std::lcm(50000, 49999); // { dg-error "overflow" } -constexpr int d = std::lcm(49999, 50000); // { dg-error "overflow" } +constexpr int c = std::lcm(50000, 49999); // { dg-error "in .constexpr." } +constexpr int d = std::lcm(49999, 50000); // { dg-error "in .constexpr." } // Similarly for unsigned, but the diagnostic is a failed assertion instead. -constexpr int e = std::lcm(500000u, 499999); // { dg-error "in 'constexpr'" } -constexpr int f = std::lcm(499999u, 500000); // { dg-error "in 'constexpr'" } +constexpr int e = std::lcm(500000u, 499999); // { dg-error "in .constexpr." } +constexpr int f = std::lcm(499999u, 500000); // { dg-error "in .constexpr." } + +// { dg-error "overflow" "" { target *-*-* } 0 } // { dg-error "unreachable" "" { target *-*-* } 0 }