Re: [PATCH v2] Add infcall support for C++ constructor-style expressions

[Keith Seitz <keiths@redhat.com>]

Ping.

On 4/27/26 9:43 AM, Keith Seitz wrote:
> Changes in v2:
> - Formatting fixes
> - Use c_isspace to skip whitespace in typename_token_for()
> - Merged rules for typename_for_ctor to type_exp
>    [This adds ~20 shift/reduce conflicts.]
> - Updated error message when overload-resolution is off
> - Handle static constructors and add new tests for this case
> - Added test case for when ctor is not found
> - Test early return: remove integer return status
>   
> Thanks,
> Keith
> 
> ---------
> 
> This patch adds an initial try at teaching the expression parser/evaluator
> to construct temporary objects requiring construction during an inferior
> function call.
> 
> To accomplish this, I've chosen the route of modifying the parser to
> teach it that `Type(args)' is a function call when `Type' names a
> class/struct/union and is immediately followed by '(', that is, via look-
> ahead). A new parser token and grammar rule have been added to deal
> with this new production.
> 
> The real work is dispatched to `type_operation::evaluate_funcall',
> allocating memory for the temporary and finding the most suitable constructor
> with `find_overload_match'.  It then runs the inferior call, returning
> the newly constructed object.
> 
> I've included many tests covering as many corner cases as I could invent,
> and these tests are clang clean.  They also introduce no regressions on
> x86-64 Fedora 43 with GCC 15.2.1 and RHEL 9.4 with GCC 11.5.0.
> 
> Example:
> Consider a C++ frame where 'struct S { int x; S(int); ... }' is in scope
> 
> Before:
> (gdb) print S(42)
> ❌️ A syntax error in expression, near `10)'.
> 
> After:
> (gdb) print S(42)
> $1 = {x = 42}
> 
> Note that no attempt has been made to deal with templates.  Hopefully
> a follow-on patch can address that.
> ---
>   gdb/NEWS                                     |   5 +
>   gdb/c-exp.y                                  |  85 +++++++-
>   gdb/eval.c                                   |  60 ++++++
>   gdb/expop.h                                  |   5 +
>   gdb/testsuite/gdb.cp/infcall-ctors.cc        | 141 +++++++++++++
>   gdb/testsuite/gdb.cp/infcall-ctors.exp       | 198 +++++++++++++++++++
>   gdb/testsuite/gdb.cp/static-ctor-infcall.c   |  33 ++++
>   gdb/testsuite/gdb.cp/static-ctor-infcall.exp |  87 ++++++++
>   8 files changed, 605 insertions(+), 9 deletions(-)
>   create mode 100644 gdb/testsuite/gdb.cp/infcall-ctors.cc
>   create mode 100644 gdb/testsuite/gdb.cp/infcall-ctors.exp
>   create mode 100644 gdb/testsuite/gdb.cp/static-ctor-infcall.c
>   create mode 100644 gdb/testsuite/gdb.cp/static-ctor-infcall.exp
> 
> diff --git a/gdb/NEWS b/gdb/NEWS
> index e233906153a..24d26d29ea5 100644
> --- a/gdb/NEWS
> +++ b/gdb/NEWS
> @@ -75,6 +75,11 @@
>   * The Windows native target now supports scheduler-locking.  E.g.,
>     "set scheduler-locking on" now works.  Previously it gave an error.
>   
> +* In C++ GDB now accepts constructor-style expressions "TYPE (ARGS)"
> +  when TYPE names a class, struct, or union in the current expression
> +  context.  This allows objects to be constructed directly during
> +  expression evaluation.
> +
>   * New targets
>   
>   GNU/Linux/MicroBlaze (gdbserver) microblazeel-*linux*
> diff --git a/gdb/c-exp.y b/gdb/c-exp.y
> index 2829d8bccba..73f88bd84f1 100644
> --- a/gdb/c-exp.y
> +++ b/gdb/c-exp.y
> @@ -231,7 +231,7 @@ static void c_print_token (FILE *file, int type, YYSTYPE value);
>   %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
>   %token <ssym> UNKNOWN_CPP_NAME
>   %token <voidval> COMPLETE
> -%token <tsym> TYPENAME
> +%token <tsym> TYPENAME TYPENAME_CTOR
>   %token <theclass> CLASSNAME	/* ObjC Class name */
>   %type <sval> name
>   %type <qval> qual_field_name field_name field_name_or_complete
> @@ -314,6 +314,13 @@ type_exp:	type
>   			{
>   			  pstate->push_new<type_operation> ($1);
>   			}
> +	|	TYPENAME_CTOR
> +			{
> +			  /* Constructor-style call: lexer returns TYPENAME_CTOR
> +			     only when '(' follows the type name (see
> +			     typename_token_for).  */
> +			  pstate->push_new<type_operation> ($1.type);
> +			}
>   	|	TYPEOF '(' exp ')'
>   			{
>   			  pstate->wrap<typeof_operation> ();
> @@ -534,6 +541,26 @@ msgarg	:	name ':' exp
>   			{ add_msglist(0, 0);   }
>   	;
>   
> +exp	:	type_exp '('
> +			{ pstate->start_arglist (); }
> +		arglist ')'	%prec ARROW
> +			{
> +			  std::vector<operation_up> args
> +			    = pstate->pop_vector (pstate->end_arglist ());
> +			  operation_up type_op = pstate->pop ();
> +			  pstate->push_new<funcall_operation>
> +			    (std::move (type_op), std::move (args));
> +			}
> +	;
> +
> +exp	:	type_exp '(' ')'	%prec ARROW
> +			{
> +			  operation_up type_op = pstate->pop ();
> +			  pstate->push_new<funcall_operation>
> +			    (std::move (type_op), std::vector<operation_up> ());
> +			}
> +	;
> +
>   exp	:	exp '('
>   			/* This is to save the value of arglist_len
>   			   being accumulated by an outer function call.  */
> @@ -3118,6 +3145,34 @@ static int popping;
>      built up.  */
>   static auto_obstack name_obstack;
>   
> +/* Return TYPENAME_CTOR only when the next token is '(', so this
> +   token is used solely for constructor calls.  Otherwise return TYPENAME.
> +   NAME_END is the character just past the name (e.g. yylval.sval.ptr +
> +   yylval.sval.length).  */
> +
> +static int
> +typename_token_for (struct parser_state *par_state, struct type *type,
> +		    const char *name_end)
> +{
> +  if (type == nullptr
> +      || par_state->language ()->la_language != language_cplus)
> +    return TYPENAME;
> +  type = check_typedef (type);
> +  if (type->code () != TYPE_CODE_STRUCT && type->code () != TYPE_CODE_UNION)
> +    return TYPENAME;
> +  /* Only return TYPENAME_CTOR when followed by '('.  */
> +  if (name_end == nullptr)
> +    return TYPENAME;
> +  {
> +    const char *p = name_end;
> +    while (c_isspace (*p))
> +      ++p;
> +    if (*p != '(')
> +      return TYPENAME;
> +  }
> +  return TYPENAME_CTOR;
> +}
> +
>   /* Classify a NAME token.  The contents of the token are in `yylval'.
>      Updates yylval and returns the new token type.  BLOCK is the block
>      in which lookups start; this can be NULL to mean the global scope.
> @@ -3161,7 +3216,8 @@ classify_name (struct parser_state *par_state, const struct block *block,
>   	  if (bsym.symbol != NULL)
>   	    {
>   	      yylval.tsym.type = bsym.symbol->type ();
> -	      return TYPENAME;
> +	      return typename_token_for (par_state, yylval.tsym.type,
> +					 yylval.sval.ptr + yylval.sval.length);
>   	    }
>   	}
>   
> @@ -3188,7 +3244,8 @@ classify_name (struct parser_state *par_state, const struct block *block,
>     if (bsym.symbol && bsym.symbol->loc_class () == LOC_TYPEDEF)
>       {
>         yylval.tsym.type = bsym.symbol->type ();
> -      return TYPENAME;
> +      return typename_token_for (par_state, yylval.tsym.type,
> +				 yylval.sval.ptr + yylval.sval.length);
>       }
>   
>     /* See if it's an ObjC classname.  */
> @@ -3274,7 +3331,9 @@ classify_inner_name (struct parser_state *par_state,
>         if (base_type != NULL)
>   	{
>   	  yylval.tsym.type = base_type;
> -	  return TYPENAME;
> +	  return typename_token_for (par_state, yylval.tsym.type,
> +				     yylval.ssym.stoken.ptr
> +				     + yylval.ssym.stoken.length);
>   	}
>   
>         return ERROR;
> @@ -3294,14 +3353,18 @@ classify_inner_name (struct parser_state *par_state,
>   	if (base_type != NULL)
>   	  {
>   	    yylval.tsym.type = base_type;
> -	    return TYPENAME;
> +	    return typename_token_for (par_state, yylval.tsym.type,
> +				       yylval.ssym.stoken.ptr
> +				       + yylval.ssym.stoken.length);
>   	  }
>         }
>         return ERROR;
>   
>       case LOC_TYPEDEF:
>         yylval.tsym.type = yylval.ssym.sym.symbol->type ();
> -      return TYPENAME;
> +      return typename_token_for (par_state, yylval.tsym.type,
> +				 yylval.ssym.stoken.ptr
> +				 + yylval.ssym.stoken.length);
>   
>       default:
>         return NAME;
> @@ -3336,7 +3399,7 @@ handle_qualified_field_name (qualified_name_token token)
>         int kind = classify_inner_name (pstate,
>   				      pstate->expression_context_block,
>   				      type);
> -      if (kind != TYPENAME)
> +      if (kind != TYPENAME && kind != TYPENAME_CTOR)
>   	error (_("could not find type '%s'"), accum.c_str ());
>   
>         type = yylval.tsym.type;
> @@ -3388,7 +3451,8 @@ yylex (void)
>       current.token = classify_name (pstate, pstate->expression_context_block,
>   				   is_quoted_name, last_lex_was_structop);
>     if (pstate->language ()->la_language != language_cplus
> -      || (current.token != TYPENAME && current.token != COLONCOLON
> +      || (current.token != TYPENAME && current.token != TYPENAME_CTOR
> +	  && current.token != COLONCOLON
>   	  && current.token != FILENAME
>   	  && (cpstate->assume_classification == TYPE_CODE_UNDEF
>   	      || current.token != NAME))
> @@ -3434,6 +3498,7 @@ yylex (void)
>     else
>       {
>         gdb_assert (current.token == TYPENAME
> +		  || current.token == TYPENAME_CTOR
>   		  || cpstate->assume_classification != TYPE_CODE_UNDEF);
>         search_block = pstate->expression_context_block;
>         obstack_grow (&name_obstack, current.value.sval.ptr,
> @@ -3464,7 +3529,8 @@ yylex (void)
>   						  context_type);
>   	  /* We keep going until we either run out of names, or until
>   	     we have a qualified name which is not a type.  */
> -	  if (classification != TYPENAME && classification != NAME)
> +	  if (classification != TYPENAME && classification != TYPENAME_CTOR
> +	      && classification != NAME)
>   	    break;
>   
>   	  /* Accept up to this token.  */
> @@ -3595,6 +3661,7 @@ c_print_token (FILE *file, int type, YYSTYPE value)
>         break;
>   
>       case TYPENAME:
> +    case TYPENAME_CTOR:
>         parser_fprintf (file, "tsym<type=%s, name=%s>",
>   		      value.tsym.type->safe_name (),
>   		      copy_name (value.tsym.stoken).c_str ());
> diff --git a/gdb/eval.c b/gdb/eval.c
> index a00774bda3d..933415ce028 100644
> --- a/gdb/eval.c
> +++ b/gdb/eval.c
> @@ -1872,6 +1872,66 @@ type_operation::evaluate (struct type *expect_type, struct expression *exp,
>       error (_("Attempt to use a type name as an expression"));
>   }
>   
> +value *
> +type_operation::evaluate_funcall (struct type *expect_type,
> +				  struct expression *exp,
> +				  enum noside noside,
> +				  const std::vector<operation_up> &args)
> +{
> +  struct type *type = std::get<0> (m_storage);
> +  type = check_typedef (type);
> +
> +  /* Constructor-style call Type(args) is only for C++ aggregate types.  */
> +  gdb_assert (exp->language_defn->la_language == language_cplus);
> +
> +  const char *name = type->name ();
> +  if (name == nullptr)
> +    error (_("Cannot call constructor of unnamed type"));
> +
> +  /* Get the constructor name from the type name.  */
> +  gdb::unique_xmalloc_ptr<char> ctor_name_ptr = cp_func_name (name);
> +  const char *ctor_name =
> +    (ctor_name_ptr != nullptr) ? ctor_name_ptr.get () : name;
> +
> +  if (!overload_resolution)
> +    error (_("Constructor calls require 'overload-resolution' to be on"));
> +
> +  std::vector<value *> argvec (1 + args.size ());
> +  value *this_ptr;
> +  if (noside == EVAL_AVOID_SIDE_EFFECTS)
> +    this_ptr = value::zero (lookup_pointer_type (type), lval_memory);
> +  else
> +    {
> +      value *alloc_val = value_allocate_space_in_inferior (type->length ());
> +      this_ptr = value_from_pointer (lookup_pointer_type (type),
> +				     value_as_long (alloc_val));
> +    }
> +  argvec[0] = this_ptr;
> +  for (size_t i = 0; i < args.size (); ++i)
> +    argvec[i + 1] = args[i]->evaluate_with_coercion (exp, noside);
> +  gdb::array_view<value *> arg_view = argvec;
> +
> +  value *callee = nullptr;
> +  int static_memfuncp;
> +  find_overload_match (arg_view, ctor_name, METHOD,
> +		       &argvec[0], nullptr, &callee, nullptr,
> +		       &static_memfuncp, 0, noside);
> +  /* If find_overload_match fails, it will have already thrown an error.  */
> +  gdb_assert (callee != nullptr);
> +
> +  /* C++ constructors are methods. If the found method is marked static,
> +     treat it as an explicit failure until we have a real case.  */
> +  if (static_memfuncp)
> +    error (_("Constructor %s is unexpectedly marked static"), name);
> +
> +  if (noside == EVAL_AVOID_SIDE_EFFECTS)
> +    return value::zero (type, not_lval);
> +
> +  evaluate_subexp_do_call (exp, noside, callee, arg_view,
> +			   nullptr, expect_type);
> +  return value_ind (this_ptr);
> +}
> +
>   }
>   
>   /* A helper function for BINOP_ASSIGN_MODIFY.  */
> diff --git a/gdb/expop.h b/gdb/expop.h
> index c58a8d7ac37..9839e3bffa9 100644
> --- a/gdb/expop.h
> +++ b/gdb/expop.h
> @@ -1597,6 +1597,11 @@ class type_operation
>   		   struct expression *exp,
>   		   enum noside noside) override;
>   
> +  value *evaluate_funcall (struct type *expect_type,
> +			   struct expression *exp,
> +			   enum noside noside,
> +			   const std::vector<operation_up> &args) override;
> +
>     enum exp_opcode opcode () const override
>     { return OP_TYPE; }
>   
> diff --git a/gdb/testsuite/gdb.cp/infcall-ctors.cc b/gdb/testsuite/gdb.cp/infcall-ctors.cc
> new file mode 100644
> index 00000000000..5177f5de5da
> --- /dev/null
> +++ b/gdb/testsuite/gdb.cp/infcall-ctors.cc
> @@ -0,0 +1,141 @@
> +/* This testcase is part of GDB, the GNU debugger.
> +
> +   Copyright (C) 2026 Free Software Foundation, Inc.
> +
> +   This file is part of GDB.
> +
> +   This program is free software; you can redistribute it and/or modify
> +   it under the terms of the GNU General Public License as published by
> +   the Free Software Foundation; either version 3 of the License, or
> +   (at your option) any later version.
> +
> +   This program is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +   GNU General Public License for more details.
> +
> +   You should have received a copy of the GNU General Public License
> +   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
> +
> +struct S
> +{
> +  int x;
> +  explicit S (int n = 0) : x (n) {}
> +  S operator+ (int n) const
> +  {
> +    return S (x + n);
> +  }
> +};
> +
> +typedef S S_td;
> +using S_u = S;
> +
> +static int
> +add (const struct S &s1, const struct S &s2)
> +{
> +  return s1.x + s2.x;
> +}
> +
> +/* Non-trivially copyable: copy-constructing swaps the two members.  */
> +struct swapcopy
> +{
> +  int lo;
> +  int hi;
> +  swapcopy (int l, int h) : lo (l), hi (h) {}
> +  swapcopy (const swapcopy &o) : lo (o.hi), hi (o.lo) {}
> +};
> +
> +/* Pass swapcopy by value so the call must copy-construct the argument.  */
> +
> +static int
> +swapcopy_first_byval (swapcopy c)
> +{
> +  return c.lo;
> +}
> +
> +struct Base
> +{
> +  int x;
> +  Base () : x (0) {}
> +  explicit Base (int n) : x (n) {}
> +  Base (const Base &other) : x (other.x) {}
> +};
> +
> +typedef Base Base_td;
> +using Base_u = Base;
> +
> +namespace NS
> +{
> +class Derived : public Base
> +{
> +public:
> +  int y;
> +  Derived () : Base (), y (0) {}
> +  Derived (int a, int b) : Base (a), y (b) {}
> +};
> +
> +typedef Base NsBaseTd;
> +using NsBaseU = Base;
> +typedef Derived Derived_td;
> +using Derived_u = Derived;
> +
> +union U
> +{
> +  int a;
> +  U () : a (0) {}
> +  explicit U (int n) : a (n) {}
> +};
> +
> +typedef U Nu_td;
> +}
> +
> +union U
> +{
> +  int x;
> +  U () : x (0) {}
> +  explicit U (int n) : x (n) {}
> +};
> +
> +typedef U U_td;
> +
> +static int
> +plus_one (U u)
> +{
> +  return u.x + 1;
> +}
> +
> +int
> +main (void)
> +{
> +  S s0;           /* default: x = 0 */
> +  S s1 (42);     /* x = 42 */
> +  S s2 (s1 + 2); /* x = 44 */
> +  S s3 = s1;
> +  NS::Derived d;	     /* Base part x=0, Derived part y=0  */
> +  NS::Derived d1 (10, 20);   /* Base part x=10, Derived part y=20  */
> +  Base b;		     /* x=0  */
> +  Base b1 (5);               /* x=5  */
> +  Base b2 (d1);		     /* x=10  */
> +  U u0;                      /* default: x = 0  */
> +  U u1 (42);                 /* x = 42  */
> +  NS::U uv0;                /* default: a = 0  */
> +  NS::U uv1 (7);            /* a = 7  */
> +  S_td s_td = S_td (11);
> +  S_u s_u = S_u (12);
> +  Base_td b_td = Base_td (8);
> +  Base_u b_u = Base_u (9);
> +  NS::NsBaseTd nsb_td = NS::NsBaseTd (13);
> +  NS::NsBaseU nsb_u = NS::NsBaseU (14);
> +  NS::Derived_td d_td = NS::Derived_td (2, 3);
> +  NS::Derived_u d_u = NS::Derived_u (4, 5);
> +  U_td u_td = U_td (15);
> +  NS::Nu_td nu_u = NS::Nu_td (16);
> +  swapcopy swp (30, 40);
> +  int result = add (s1, s2);
> +  return result + d.x + d.y + b.x + b1.x + b2.x + d.x + d.y \
> +	+ d1.x + d1.y + plus_one (u0) + u1.x + uv0.a + uv1.a \
> +	+ s_td.x + s_u.x + b_td.x + b_u.x + nsb_td.x + nsb_u.x \
> +	+ d_td.x + d_td.y + d_u.x + d_u.y + u_td.x + nu_u.a \
> +	+ swapcopy_first_byval (swapcopy (100, 200)) \
> +	+ swapcopy_first_byval (swp);  /* stop-here */
> +}
> diff --git a/gdb/testsuite/gdb.cp/infcall-ctors.exp b/gdb/testsuite/gdb.cp/infcall-ctors.exp
> new file mode 100644
> index 00000000000..2a92266ccfe
> --- /dev/null
> +++ b/gdb/testsuite/gdb.cp/infcall-ctors.exp
> @@ -0,0 +1,198 @@
> +# Copyright (C) 2026 Free Software Foundation, Inc.
> +
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 3 of the License, or
> +# (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +
> +# This file is part of the gdb testsuite.
> +
> +# Test constructor calls and casting via inferior function calls:
> +# - Simple struct S with constructor (int, default 0).
> +# - Base and Derived; cast derived to base, construct Base from Derived.
> +# - Typedef and using aliases: ctor resolution must use the class ctor even
> +#   when the expression names a typedef or alias (DWARF may name types
> +#   differently from the underlying class tag).
> +# - swapcopy: two ints with a user-defined copy ctor that swaps them
> +#   (non-trivially copyable); pass-by-value in inferior calls must run it.
> +# - Constructor-style calls require overload resolution; verify the error
> +#   when it is disabled.
> +
> +require allow_cplus_tests
> +
> +standard_testfile .cc
> +
> +if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
> +    return
> +}
> +
> +if {![runto_main]} {
> +    return
> +}
> +
> +# Run to stop-here to ensure all locals are initialized.
> +gdb_breakpoint [gdb_get_line_number "stop-here"]
> +gdb_continue_to_breakpoint "stop-here"
> +
> +# Simple tests involving "struct S".
> +gdb_test "ptype S" [multi_line \
> +    {type = struct S \{} \
> +    {    int x;} \
> +    "" \
> +    {    S\(int\);} \
> +    {    S operator\+\(int\) const;} \
> +    {\}}]
> +
> +gdb_test "print s0" " = \\{x = 0\\}" "print s0 default ctor"
> +gdb_test "print s1" " = \\{x = 42\\}" "print s1 with 42"
> +gdb_test "print S(99)" " = \\{x = 99\\}" "construct S(99) via inferior function call"
> +
> +gdb_test "ptype swapcopy" [multi_line \
> +    {type = struct swapcopy \{} \
> +    {    int lo;} \
> +    {    int hi;} \
> +    "" \
> +    {    swapcopy\(int, int\);} \
> +    {    swapcopy\(const swapcopy ?&\);} \
> +    {\}}]
> +gdb_test "print swapcopy(1, 2)" { = \{lo = 1, hi = 2\}} \
> +    "construct swapcopy via inferior function call"
> +gdb_test {print swapcopy($)} {= \{lo = 2, hi = 1\}} \
> +    "call copy ctor on object via history"
> +gdb_test "print swapcopy_first_byval(swapcopy(10, 20))" "= 20" \
> +    "pass-by-value copy ctor swaps members"
> +gdb_test "print swapcopy_first_byval(swp)" "= 40" \
> +    "swapcopy local passed by value uses copy ctor"
> +
> +gdb_test "print S_td(33)" " = \\{x = 33\\}" \
> +    "construct S via typedef name (not underlying struct tag)"
> +gdb_test "print S_u(34)" " = \\{x = 34\\}" "construct S via using alias"
> +gdb_test "print Base_td(8)" { = \{x = 8\}} "construct Base via typedef name"
> +gdb_test "print Base_u(9)" { = \{x = 9\}} "construct Base via using alias"
> +gdb_test "print NS::NsBaseTd(5)" { = \{x = 5\}} \
> +    "construct Base via typedef in namespace"
> +gdb_test "print NS::NsBaseU(6)" { = \{x = 6\}} \
> +    "construct Base via using alias in namespace"
> +gdb_test "print NS::Derived_td(1, 2)" { = \{<Base> = \{x = 1\}, y = 2\}} \
> +    "construct NS::Derived via typedef name"
> +gdb_test "print NS::Derived_u(3, 4)" { = \{<Base> = \{x = 3\}, y = 4\}} \
> +    "construct NS::Derived via using alias"
> +gdb_test "print U_td(55)" { = \{x = 55\}} \
> +    "construct global union U via typedef name"
> +gdb_test "print NS::Nu_td(66)" { = \{a = 66\}} \
> +    "construct NS::U via typedef name"
> +
> +# Tests involving "Base" and "Derived".
> +set base_re [multi_line \
> +    {type = struct Base \{} \
> +    {    int x;} \
> +    "" \
> +    {    Base\(void\);} \
> +    {    Base\(int\);} \
> +    {    Base\(const Base ?&\);} \
> +    {\}}]
> +gdb_test "ptype Base" $base_re
> +
> +set derived_re [multi_line \
> +    {type = class NS::Derived : public Base \{} \
> +    {  public:} \
> +    {    int y;} \
> +    "" \
> +    {    Derived\(void\);} \
> +    {    Derived\(int, int\);} \
> +    {\}}]
> +gdb_test "ptype NS::Derived" $derived_re
> +
> +gdb_test "print d" { = \{<Base> = \{x = 0\}, y = 0\}}
> +gdb_test "print d1" { = \{<Base> = \{x = 10\}, y = 20\}}
> +gdb_test "print b" { = \{x = 0\}}
> +gdb_test "print b1" { = \{x = 5\}}
> +gdb_test "print b2" { = \{x = 10\}}
> +gdb_test "print (Base)(d1)" { = \{x = 10\}} "cast (Base)(d1) slices to Base"
> +gdb_test "print Base(d1)" { = \{x = 10\}} "construct Base(d1) from Derived"
> +gdb_test "print Base()" { = \{x = 0\}} "construct Base() default"
> +gdb_test "print Base(7)" { = \{x = 7\}} "construct Base(7) with argument"
> +gdb_test "print NS::Derived()" { = \{<Base> = \{x = 0\}, y = 0\}} \
> +    "construct NS::Derived() via inferior function call"
> +gdb_test "print NS::Derived().y" " = 0" "construct NS::Derived() and access .y"
> +gdb_test "print NS::Derived(1, 2)" { = \{<Base> = \{x = 1\}, y = 2\}} \
> +    "construct NS::Derived(1, 2) via inferior function call"
> +gdb_test "print NS::Derived(1, 2).y" " = 2" \
> +    "construct NS::Derived(1, 2) and access .y"
> +gdb_test "print ((Base)d1).x" " = 10" "cast ((Base)d1).x"
> +
> +# Print the types of these "temporary" objects.
> +gdb_test "ptype Base()" $base_re "ptype of Base temporary"
> +gdb_test "ptype NS::Derived(15, 25)" $derived_re \
> +	"ptype of NS::Derived temporary"
> +
> +# Tests involving unions.
> +gdb_test "ptype U" [multi_line \
> +    {type = union U \{} \
> +    {    int x;} \
> +    "" \
> +    {    U\(void\);} \
> +    {    U\(int\);} \
> +    {\}}] \
> +    "ptype U"
> +
> +gdb_test "ptype NS::U" [multi_line \
> +    {type = union NS::U \{} \
> +    {    int a;} \
> +    "" \
> +    {    U\(void\);} \
> +    {    U\(int\);} \
> +    {\}}] \
> +    "ptype NS::U"
> +
> +gdb_test "print u0" { = \{x = 0\}}
> +gdb_test "print u1" { = \{x = 42\}}
> +gdb_test "print uv0" { = \{a = 0\}}
> +gdb_test "print uv1" { = \{a = 7\}}
> +gdb_test "print U()" { = \{x = 0\}} "construct U() via inferior function call"
> +gdb_test "print U(99)" { = \{x = 99\}} "construct U(99) via inferior function call"
> +gdb_test "print U(99).x" " = 99" "construct U(99) and access .x"
> +gdb_test "print NS::U()" { = \{a = 0\}} \
> +    "construct NS::U() via inferior function call"
> +gdb_test "print NS::U(13)" { = \{a = 13\}} \
> +    "construct NS::U(13) via inferior function call"
> +gdb_test "print NS::U(13).a" " = 13" \
> +    "construct NS::U(13) and access .a"
> +
> +set u_re [multi_line \
> +    {type = union U \{} \
> +    {    int x;} \
> +    "" \
> +    {    U\(void\);} \
> +    {    U\(int\);} \
> +    {\}}]
> +set ns_u_re [multi_line \
> +    {type = union NS::U \{} \
> +    {    int a;} \
> +    "" \
> +    {    U\(void\);} \
> +    {    U\(int\);} \
> +    {\}}]
> +gdb_test "ptype U()" $u_re "ptype of U temporary"
> +gdb_test "ptype NS::U(99)" $ns_u_re "ptype of NS::U temporary"
> +
> +gdb_test "p plus_one(U(42))" "= 43" "temporary in function call"
> +gdb_test "p add(S(1), S(20))" "= 21" "add two temporaries of S"
> +gdb_test "p plus_one(U(add (S(4), S(6))))" "= 11" \
> +    "nested function call using temporaries"
> +
> +gdb_test_no_output "set overload-resolution off"
> +gdb_test "print S(1)" \
> +    {Constructor calls require 'overload-resolution' to be on} \
> +    "constructor call fails when overload-resolution is off"
> +gdb_test_no_output "set overload-resolution on"
> +gdb_test "print S(1)" " = \\{x = 1\\}" \
> +    "constructor call works after overload-resolution turned back on"
> diff --git a/gdb/testsuite/gdb.cp/static-ctor-infcall.c b/gdb/testsuite/gdb.cp/static-ctor-infcall.c
> new file mode 100644
> index 00000000000..0516196e6d8
> --- /dev/null
> +++ b/gdb/testsuite/gdb.cp/static-ctor-infcall.c
> @@ -0,0 +1,33 @@
> +/* This testcase is part of GDB, the GNU debugger.
> +
> +   Copyright 2026 Free Software Foundation, Inc.
> +
> +   This file is part of GDB.
> +
> +   This program is free software; you can redistribute it and/or modify
> +   it under the terms of the GNU General Public License as published by
> +   the Free Software Foundation; either version 3 of the License, or
> +   (at your option) any later version.
> +
> +   This program is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +   GNU General Public License for more details.
> +
> +   You should have received a copy of the GNU General Public License
> +   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
> +
> +/* Address range for hand-written DWARF describing a static constructor.  */
> +
> +extern "C" void
> +dwarf_static_ctor_stub (void)
> +{
> +  asm ("dwarf_static_ctor_stub_label: .globl dwarf_static_ctor_stub_label");
> +}
> +
> +int
> +main (void)
> +{
> +  asm ("main_label: .globl main_label");
> +  return 0;
> +}
> diff --git a/gdb/testsuite/gdb.cp/static-ctor-infcall.exp b/gdb/testsuite/gdb.cp/static-ctor-infcall.exp
> new file mode 100644
> index 00000000000..cdc2db170d6
> --- /dev/null
> +++ b/gdb/testsuite/gdb.cp/static-ctor-infcall.exp
> @@ -0,0 +1,87 @@
> +# Copyright 2026 Free Software Foundation, Inc.
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 3 of the License, or
> +# (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +#
> +# Exercise the "Constructor %s is unexpectedly marked static" error in
> +# type_operation::evaluate_funcall.
> +
> +load_lib dwarf.exp
> +
> +require dwarf2_support
> +require allow_cplus_tests
> +
> +standard_testfile .c -dw.S
> +
> +set asm_file [standard_output_file $srcfile2]
> +Dwarf::assemble $asm_file {
> +    declare_labels int_label struct_label ptr_label ctor_subr_label
> +
> +    get_func_info dwarf_static_ctor_stub {nodebug c++}
> +
> +    cu {} {
> +	compile_unit {
> +	    DW_AT_language @DW_LANG_C_plus_plus
> +	    DW_AT_name dw2-static-ctor-infcall.cc
> +	    DW_AT_comp_dir /tmp
> +	} {
> +	    int_label: base_type {
> +		DW_AT_name int
> +		DW_AT_encoding @DW_ATE_signed
> +		DW_AT_byte_size 4 DW_FORM_sdata
> +	    }
> +
> +	    struct_label: structure_type {
> +		DW_AT_name dwarf_static_ctor
> +		DW_AT_byte_size 4 DW_FORM_sdata
> +	    } {
> +		member {
> +		    DW_AT_name x
> +		    DW_AT_type :$int_label
> +		    DW_AT_data_member_location 0 data1
> +		}
> +		ptr_label: pointer_type {
> +		    DW_AT_type :$struct_label
> +		}
> +		ctor_subr_label: subroutine_type {
> +		    DW_AT_type :$int_label
> +		} {
> +		    formal_parameter {
> +			DW_AT_type :$ptr_label
> +		    }
> +		}
> +		subprogram {
> +		    DW_AT_name dwarf_static_ctor
> +		    DW_AT_external 1 flag
> +		    DW_AT_low_pc $dwarf_static_ctor_stub_start addr
> +		    DW_AT_high_pc $dwarf_static_ctor_stub_end addr
> +		    DW_AT_type :$ctor_subr_label
> +		}
> +	    }
> +	}
> +    }
> +}
> +
> +if {[prepare_for_testing "failed to prepare" ${testfile} \
> +	 [list $srcfile $asm_file] {nodebug c++}]} {
> +    return
> +}
> +
> +if {![runto_main]} {
> +    return
> +}
> +
> +gdb_test_no_output "set language c++"
> +
> +gdb_test "print dwarf_static_ctor()" \
> +    "Constructor dwarf_static_ctor is unexpectedly marked static"
> 
> base-commit: 8e78d43dbcd122e852d59abe29c8d6aeb6c04925