Implement Ada resolution

Ada has a parser post-pass that implements "resolution".  This process
replaces some opcodes with function calls.  For example, a "+"
operation might be replaced with a call to the appropriate overloaded
function.

This differs from the approach taken for the same problem in C++.
However, in this series I chose not to try to make changes outside of
rewrite the expression data structure.  So, resolution remains.

The new approach to resolution is to introduce an interface class,
that some concrete operations implement.  Then, the Ada code will use
this to resolve the expression tree.  Because new-style expressions
are built as ordinary objects, and don't require rewriting the data
structure in place, in the new code this processing will be done in
the parser.  By the end of the series, some special cases in this area
that exist only for Ada will be removed.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_var_value_operation::resolve)
(ada_funcall_operation::resolve)
(ada_ternop_slice_operation::resolve): New methods.
* ada-exp.h (struct ada_resolvable): New.
(class ada_var_value_operation): Derive from ada_resolvable.
<get_block, resolve>: New methods.
(class ada_funcall_operation): Derive from ada_resolvable.
<resolve>: New method.
(class ada_ternop_slice_operation): Derive from ada_resolvable.
<resolve>: New method.

Implement function calls for Ada

This implements function calls for Ada.  This takes a different
approach than that used for other languages, primarily because Ada
requires special treatment generally.  The "ordinary" special case for
just the callee didn't really apply neatly here; there's only one case
in Ada needing special callee treatment.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_funcall_operation::evaluate): New method.
* ada-exp.h (class ada_var_msym_value_operation) <get_symbol>: New
method.
(class ada_funcall_operation): New.

Introduce ada_structop_operation

This adds class ada_structop_operation, which implements
STRUCTOP_STRUCT for Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_structop_operation::evaluate): New method.
* ada-exp.h (class ada_structop_operation): New.

Introduce ada_unop_ind_operation

This adds class ada_unop_ind_operation, which implements UNOP_IND for
Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_unop_ind_operation::evaluate): New method.
* ada-exp.h (class ada_unop_ind_operation): New.

Introduce ada_binop_exp_operation

This adds class ada_binop_exp_operation, which implements BINOP_EXP
for Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_binop_exp): No longer static.
* ada-exp.h (ada_binop_exp_operation): New typedef.

Introduce ada_atr_val_operation

This adds class ada_atr_val_operation, which implements OP_ATR_VAL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_val_atr): No longer static.
(ada_atr_val_operation::evaluate): New method.
* ada-exp.h (class ada_atr_val_operation): New.

Introduce ada_pos_operation

This adds class ada_pos_operation, a new typedef that implements
OP_ATR_POS.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_pos_atr): No longer static.
* ada-exp.h (ada_pos_operation): New typedef.

Refactor value_pos_atr

This refactors value_pos_atr to be directly usable by a new operation
implementation.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_pos_atr): Rename from value_pos_atr.  Change
parameters.
(ada_evaluate_subexp): Use it.

Implement Ada min and max operations

This implement the Ada min and max operations using an existing
template class.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_binop_minmax): No longer static.
* ada-exp.h (ada_binop_min_operation, ada_binop_max_operation):
New typedefs.

Introduce ada_var_msym_value_operation

This adds class ada_var_msym_value_operation, which implements
OP_VAR_MSYM_VALUE for Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_var_msym_value_operation::evaluate_for_cast):
New method.
* ada-exp.h (class ada_var_msym_value_operation): New.

Introduce ada_var_value_operation

This adds class ada_var_value_operation, which implements OP_VAR_VALUE
for Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_var_value_operation::evaluate_for_cast)
(ada_var_value_operation::evaluate): New methods.
* ada-exp.h (class ada_var_value_operation): New.

Implement some Ada OP_ATR_ operations

This implements a few Ada OP_ATR_ operations.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_unop_atr_operation::evaluate): New method.
* ada-exp.h (class ada_unop_atr_operation): New.

Introduce ada_binop_in_bounds

This adds class ada_binop_in_bounds, which implements BINOP_IN_BOUNDS.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_binop_in_bounds): No longer static.
* ada-exp.h (class ada_binop_in_bounds_operation): New.

Introduce ada_ternop_slice

This adds class ada_ternop_slice, which implements TERNOP_SLICE for
Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_ternop_slice): No longer static.
* ada-exp.h (class ada_ternop_slice_operation): New.

Introduce ada_bitwise_operation

This adds class ada_bitwise_operation, which is used to implement the
Ada bitwise operators.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-exp.h (ada_bitwise_operation): New template class.
(ada_bitwise_and_operation, ada_bitwise_ior_operation)
(ada_bitwise_xor_operation): New typedefs.

Implement Ada equality operators

This implements the Ada equal and not-equal operators.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_equal_binop): No longer static.
* ada-exp.h (class ada_binop_equal_operation): New.

Implement Ada multiplicative operators

This implements the Ada multiplicative operators, using an existing
template class.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_mult_binop): No longer static.
* ada-exp.h (ada_binop_mul_operation ada_binop_div_operation)
(ada_binop_rem_operation, ada_binop_mod_operation): New typedefs.

Introduce ada_binop_addsub_operation

This adds class ada_binop_addsub_operation, which implements the Ada +
and - operators.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_binop_addsub_operation::evaluate): New method.
* ada-exp.h (class ada_binop_addsub_operation): New.

Split out some Ada type resolution code

This splits some Ada type resolution code out of resolve_subexp into
new functions that can be reused.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.h (ada_find_operator_symbol, ada_resolve_funcall)
(ada_resolve_variable): Declare.
* ada-lang.c (ada_find_operator_symbol, ada_resolve_funcall)
(ada_resolve_variable): New functions.
(resolve_subexp): Update.

Implement OpenCL ternary conditional operator

This implements the ?: ternary conditional operator for OpenCL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* opencl-lang.c (opencl_ternop_cond_operation::evaluate): New
method.
* c-exp.h (class opencl_ternop_cond_operation): New.

Implement OpenCL logical binary operations

This implements "&&" and "||" for OpenCL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* opencl-lang.c (opencl_logical_binop_operation::evaluate): New
method.
* c-exp.h (class opencl_logical_binop_operation): New.

Introduce opencl_structop_operation

This adds class opencl_structop_operation, which implements
STRUCTOP_STRUCT for OpenCL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* opencl-lang.c (opencl_structop_operation::evaluate): New
method.
* c-exp.h (class opencl_structop_operation): New.

Introduce opencl_notequal_operation

This adds the opencl_notequal_operation typedef, implementing "!=" for
OpenCL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* opencl-lang.c (opencl_logical_not): No longer static.  Change
parameters.
(evaluate_subexp_opencl): Update.
* c-exp.h (opencl_notequal_operation): New typedef.

Implement OpenCL binary operations

This implements various OpenCL binary operations, adding a new
template class to do so.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* opencl-lang.c (opencl_relop, eval_opencl_assign): No longer
static.  Change parameters.
(eval_opencl_assign): No longer static.  Add "op" parameter.
(evaluate_subexp_opencl): Update.
* c-exp.h (opencl_binop_operation): New template class.
(opencl_assign_operation, opencl_equal_operation)
(opencl_notequal_operation, opencl_less_operation)
(opencl_gtr_operation, opencl_geq_operation)
(opencl_leq_operation): New typedefs.

Introduce opencl_cast_type_operation

This adds class opencl_cast_type_operation, which implements
UNOP_CAST_TYPE for OpenCL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* opencl-lang.c (opencl_value_cast): No longer static.
* c-exp.h (opencl_cast_type_operation): New typedef.

Implement fortran_allocated_operation

This implements the Fortran ALLOCATED intrinsic.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* f-exp.h (eval_op_f_allocated): Declare.
(fortran_allocated_operation): New typedef.
* f-lang.c (eval_op_f_allocated): No longer static.

Implement Fortran associated operations

This implements the Fortran 1- and 2-argument "associated" operations.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* f-lang.c (eval_op_f_associated): New functions.
* f-exp.h (fortran_associated_1arg, fortran_associated_2arg): New
typedefs.

Introduce classes for Fortran bound intrinsics

This adds class fortran_bound_1arg and fortran_bound_2arg, to
implement the Fortran lbound and ubound intrinsics.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* f-lang.c (fortran_bound_1arg::evaluate)
(fortran_bound_2arg::evaluate): New methods.
* f-exp.h (class fortran_bound_1arg, class fortran_bound_2arg):
New.

Introduce fortran_undetermined

This adds class fortran_undetermined, which implements
OP_F77_UNDETERMINED_ARGLIST.  fortran_range_operation is also added
here, as it is needed by fortran_undetermined.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_addr_operation) <get_expression>: New
method.
* f-lang.c (fortran_undetermined::value_subarray)
(fortran_undetermined::evaluate): New methods.
(fortran_prepare_argument): New overload.
* f-exp.h (class fortran_range_operation)
(class fortran_undetermined): New classes.

Implement Rust funcall operation

This adds the special code needed to handle the Rust function call
operation.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (rust_structop::evaluate_funcall): New method.
* rust-exp.h (class rust_structop) <evaluate_funcall>: Declare
method.

Implement function call operations

This implement function call operations.

The current function call code relies on some very lengthy code
(evaluate_funcall is 398 lines...) to distinguish between the
different opcodes that might appear in the callee position.

Rather than try to replicate this, and have a function that tried to
dissect many different kinds of operation subclass, this patch instead
puts the work into the callee.  A new operation::evaluate_funcall
method is added, and then this is overridden in the classes that
require special treatment.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expression.h (class operation) <evaluate_funcall>: New methods.
* expop.h (class scope_operation) <evaluate_funcall>: New method.
(class var_value_operation) <evaluate_funcall>: New method.
(class structop_base_operation) <evaluate_funcall>: New method.
(class var_msym_value_operation) <evaluate_funcall>: New method.
(class structop_member_base): New class.
(class structop_member_operation): Derive from
structop_member_base.
(class structop_mptr_operation): Derive from
structop_member_base.
(class funcall_operation): New class.
* eval.c (operation::evaluate_funcall)
(var_value_operation::evaluate_funcall)
(scope_operation::evaluate_funcall)
(structop_member_base::evaluate_funcall)
(structop_base_operation::evaluate_funcall): New methods.

Introduce array_operation

This adds class array_operation, which implements OP_ARRAY.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class array_operation): New.
* eval.c (array_operation::evaluate_struct_tuple)
(array_operation::evaluate): New methods.

Introduce class adl_func_operation

This adds class adl_func_operation, which implements
argument-dependent lookup function calls.

Other function calls will be handled in a different way.  However,
because ADL calls were created in a single spot in the C++ parser, and
because they had different semantics from the other cases, it was
convenient to treat them specially.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class adl_func_operation): New.
* eval.c (adl_func_operation::evaluate): New method.

Introduce ada_unop_range_operation

This adds class ada_unop_range_operation, which implements
UNOP_IN_RANGE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_unop_in_range): No longer static.
* ada-exp.h (class ada_unop_range_operation): New.

Implement some Ada unary operations

This implements a few Ada unary operations, using the existing
unop_operation template class.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_unop_neg, ada_atr_tag, ada_atr_size, ada_abs):
No longer static.
* ada-exp.h (ada_neg_operation, ada_atr_tag_operation)
(ada_atr_size_operation, ada_abs_operation): New typedefs.

Implement the "&&" and "||" operators

This implements the "&&" and "||" operators.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class logical_and_operation)
(class logical_or_operation): New.
* eval.c (logical_and_operation::evaluate)
(logical_or_operation::evaluate): New methods.
* ax-gdb.c (logical_and_operation::do_generate_ax)
(logical_or_operation::do_generate_ax): New methods.

Add two simple Modula-2 operations

This adds a couple of simple Modula-2 operations.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* m2-lang.c (eval_op_m2_high, eval_op_m2_subscript): No longer
static.
* m2-exp.h: New file.

Introduce rust_aggregate_operation

This adds class rust_aggregate_operation, which implements
OP_AGGREGATE for Rust.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (rust_aggregate_operation::evaluate): New method.
* rust-exp.h (class rust_aggregate_operation): New.

Implement Rust field operations

This implements the field operations STRUCTOP_STRUCT and
STRUCTOP_ANONYMOUS, for Rust.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (eval_op_rust_struct_anon, eval_op_rust_structop):
No longer static.
* rust-exp.h (class rust_struct_anon): New.
(class rust_structop): New.

Introduce rust_range_operation

This adds class rust_range_operation, which implements OP_RANGE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (rust_range): No longer static.
* rust-exp.h (class rust_range_operation): New.

Introduce rust_subscript_operation

This adds class rust_subscript_operation, which implements
BINOP_SUBSCRIPT for Rust.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (rust_subscript): No longer static.
* rust-exp.h (class rust_subscript_operation): New.

Introduce rust_unop_ind_operation

This adds class rust_unop_ind_operation, which implements UNOP_IND for
Rust.  Rust requires a special case here to handle trait objects.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (eval_op_rust_ind): No longer static.  Add "opcode"
parameter.
(rust_evaluate_subexp): Update.
* rust-exp.h (class rust_unop_ind_operation): New.

Implement some Rust operations

This implements some straightforward Rust operations, using existing
template classes.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* rust-lang.c (eval_op_rust_complement, eval_op_rust_array): No
longer static.  Add "opcode" parameter.
(rust_evaluate_subexp): Update.
* rust-exp.h: New file.

Implement several Fortran operations

This implements several straightforward Fortran operations, primarily
by reusing existing template classes.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* f-lang.c (eval_op_f_abs, eval_op_f_mod, eval_op_f_ceil)
(eval_op_f_floor, eval_op_f_modulo, eval_op_f_cmplx)
(eval_op_f_kind): No longer static.  Add "opcode" parameter.
(evaluate_subexp_f): Update.
* f-exp.h: New file.

Introduce ada_ternop_range_operation

This adds class ada_ternop_range_operation, which implements
TERNOP_IN_RANGE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_ternop_range_operation::evaluate): New method.
* ada-exp.h (class ada_ternop_range_operation): New.

Introduce ada_qual_operation

This adds class ada_qual_operation, which implements UNOP_QUAL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_qual_operation::evaluate): New method.
* ada-exp.h (class ada_qual_operation): New.

Introduce ada_string_operation

This adds class ada_string_operation, which implements string
constants for Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_string_operation::evaluate): New method.
* ada-exp.h (class ada_string_operation): New.

Introduce ada_wrapped_operation

This adds class ada_wrapped_operation, which is used to wrap some
generic operations with a bit of Ada-specific handling.  This
corresponds to the old "default" case in ada_evaluate_subexp.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ada-lang.c (ada_wrapped_operation::evaluate): New method.
* ada-exp.h: New file.

Introduce multi_subscript_operation

This adds class multi_subscript_operation, which implements
MULTI_SUBSCRIPT.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class multi_subscript_operation): New.
* eval.c (multi_subscript_operation::evaluate): New method.

Introduce objc_msgcall_operation

This adds class objc_msgcall_operation, which implements
OP_OBJC_MSGCALL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* eval.c (objc_msgcall_operation::evaluate): New method.
* c-exp.h (class objc_msgcall_operation): New.

Introduce var_value_operation

This adds class var_value_operation, which implements OP_VAR_VALUE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class var_value_operation): New.
* eval.c (var_value_operation::evaluate)
(var_value_operation::evaluate_for_address)
(var_value_operation::evaluate_with_coercion)
(var_value_operation::evaluate_for_sizeof)
(var_value_operation::evaluate_for_cast): New methods.
* ax-gdb.c (var_value_operation::do_generate_ax): New method.

Implement C++ cast operations

This adds class cxx_cast_operation, which is used to implement the C++
dynamic_cast and reinterpret_cast operations.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (cxx_cast_ftype): New typedef.
(cxx_cast_operation): New template.
(dynamic_cast_operation, reinterpret_cast_operation): New
typedefs.

Introduce unop_cast_type_operation

This adds class unop_cast_type_operation, which implements
UNOP_CAST_TYPE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_cast_type_operation): New.
* ax-gdb.c (unop_cast_type_operation::do_generate_ax): New
method.

Introduce unop_cast_operation

This adds class unop_cast_operation, which implements UNOP_CAST.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_cast_operation): New.
* ax-gdb.c (unop_cast_operation::do_generate_ax): New method.

Introduce assign_modify_operation

This adds class assign_modify_operation, which implements
BINOP_ASSIGN_MODIFY.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class assign_modify_operation): New.
* eval.c (eval_binop_assign_modify): No longer static.
* ax-gdb.c (assign_modify_operation::do_generate_ax): New method.

Introduce assign_operation

This adds class assign_operation, which implements BINOP_ASSIGN.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class assign_operation): New.
* ax-gdb.c (assign_operation::do_generate_ax): New method.

Introduce type_instance_operation

This adds class type_instance_operation, which implements
TYPE_INSTANCE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class type_instance_operation): New.
* eval.c (type_instance_operation::evaluate): New method.

Introduce op_this_operation

This adds class op_this_operation, which implements OP_THIS.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class op_this_operation): New.
* ax-gdb.c (op_this_operation::do_generate_ax): New method.

Implement UNOP_MEMVAL and UNOP_MEMVAL_TYPE

This adds class unop_memval_operation and unop_memval_type_operation,
which implement UNOP_MEMVAL and UNOP_MEMVAL_TYPE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_memval_operation)
(class unop_memval_type_operation): New.
* eval.c (eval_op_memval): No longer static.
(unop_memval_operation::evaluate_for_address)
(unop_memval_type_operation::evaluate_for_address)
(unop_memval_operation::evaluate_for_sizeof)
(unop_memval_type_operation::evaluate_for_sizeof): New methods.
* ax-gdb.c (unop_memval_operation::do_generate_ax)
(unop_memval_type_operation::do_generate_ax): New methods.

Introduce unop_alignof_operation

This adds class unop_alignof_operation, which implements UNOP_ALIGNOF.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_alignof_operation): New.
* eval.c (eval_op_alignof): No longer static.

Introduce unop_sizeof_operation

This adds class unop_sizeof_operation, which implements UNOP_SIZEOF.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_sizeof_operation): New.
* ax-gdb.c (unop_sizeof_operation::do_generate_ax): New method.

Introduce unop_addr_operation

This adds class unop_addr_operation, which implements UNOP_ADDR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_addr_operation): New.
* ax-gdb.c (gen_expr_unop) <case UNOP_ADDR>: New.

Introduce typeid_operation

This adds class typeid_operation, which implements OP_TYPEID.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class typeid_operation): New.

Introduce decltype_operation

This adds class decltype_operation, which implements OP_DECLTYPE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class decltype_operation): New.

Introduce typeof_operation

This adds class typeof_operation, which implements OP_TYPEOF.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class typeof_operation): New.

Introduce type_operation

This adds class type_operation, which implements OP_TYPE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class type_operation): New.
* eval.c (eval_op_type): No longer static.

Introduce unop_ind_operation

This adds class unop_ind_operation, which implements UNOP_IND.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class unop_ind_base_operation)
(class unop_ind_operation): New.
* eval.c (eval_op_ind): No longer static.  Remove "op" parameter.
(unop_ind_base_operation::evaluate_for_address)
(unop_ind_base_operation::evaluate_for_sizeof): New method.
* ax-gdb.c (gen_expr_unop) <case UNOP_IND>: New.

Implement unary increment and decrement operations

This implements the unary increment and decrement operations, "++" and
"--".

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (unop_incr_operation): New template.
(preinc_operation, predec_operation, postinc_operation)
(postdec_operation): New typedefs.
* eval.c (eval_op_preinc, eval_op_predec, eval_op_postinc)
(eval_op_postdec): No longer static.

Implement some unary operations

This introduces a couple of new template classes and then uses them to
implement some simple unary operations.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (unary_ftype): New typedef.
(unop_operation, usual_ax_binop_operation): New templates.
(unary_plus_operation, unary_neg_operation)
(unary_complement_operation, unary_logical_not_operation): New
typedefs.
* eval.c (eval_op_plus, eval_op_neg, eval_op_complement)
(eval_op_lognot): No longer static.
* ax-gdb.c (gen_expr_unop): New function.

Introduce comma_operation

This adds class comma_operation, which implements BINOP_COMMA.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* ax-gdb.c (comma_operation::do_generate_ax): New method.

Introduce repeat_operation

This adds class repeat_operation, which implements BINOP_REPEAT.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class repeat_operation): New.
* eval.c (eval_op_repeat): No longer static.  Remove "op"
parameter.
(evaluate_subexp_standard): Update.
* ax-gdb.c (repeat_operation::do_generate_ax): New method.

Implement binary comparison operations

This implements the binary comparison operations via a template class.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class comparison_operation): New.
(equal_operation, notequal_operation, less_operation)
(gtr_operation, geq_operation, leq_operation): New typedefs.
* eval.c (eval_op_equal, eval_op_notequal, eval_op_less)
(eval_op_gtr, eval_op_geq, eval_op_leq): No longer static.

Introduce subscript_operation

This adds class subscript_operation, which implements BINOP_SUBSCRIPT.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class subscript_operation): New.
* eval.c (eval_op_subscript): No longer static.

Introduce binop_operation

This adds two new template classes, binop_operation and
usual_ax_binop_operation, and then uses these to implement a number of
binary operations that follow similar patterns.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class binop_operation, class usual_ax_binop_operation):
New.
(exp_operation, intdiv_operation, mod_operation, mul_operation)
(div_operation, rem_operation, lsh_operation, rsh_operation)
(bitwise_and_operation, bitwise_ior_operation)
(bitwise_xor_operation): New typedefs.
* eval.c (eval_op_binary): No longer static.

Introduce sub_operation

This adds class sub_operation, which implements BINOP_SUB.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class sub_operation): New.
* eval.c (eval_op_sub): No longer static.  Remove "op" parameter.
(evaluate_subexp_standard): Update.

Introduce add_operation

This adds class add_operation, which implements BINOP_ADD.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class add_operation): New.
* eval.c (eval_op_add): No longer static.  Remove "op" parameter.
(evaluate_subexp_standard): Update.

Introduce concat_operation

This adds class concat_operation, which implements BINOP_CONCAT.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class concat_operation): New.
* eval.c (eval_op_concat): No longer static.  Remove "op"
parameter.
(evaluate_subexp_standard): Update.

Introduce structop_member_operation and structop_mptr_operation

This adds class structop_member_operation and structop_mptr_operation,
which implement STRUCTOP_MEMBER and STRUCTOP_MPTR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class structop_member_operation)
(class structop_mptr_operation): New.
* eval.c (eval_op_member): No longer static.

Introduce structop_ptr_operation

This adds class structop_ptr_operation, which implements STRUCTOP_PTR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class structop_ptr_operation): New.
* eval.c (eval_op_structop_ptr): No longer static.  Remove "op"
parameter.

Introduce structop_operation

This adds class structop_base_operation and structop_operation, which
implement STRUCTOP_STRUCT.  The base class exists to unify the
completion code between STRUCTOP_STRUCT and STRUCTOP_PTR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class structop_base_operation)
(class structop_operation): New.
* eval.c (eval_op_structop_struct): No longer static.

Introduce complex_operation

This adds class complex_operation, which implements OP_COMPLEX.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class complex_operation): New.

Introduce objc_selector_operation

This adds class objc_selector_operation, which implements
OP_OBJC_SELECTOR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* eval.c (eval_op_objc_selector): No longer static.
* c-exp.h (class objc_selector_operation): New.

Introduce objc_nsstring_operation

This adds class objc_nsstring_operation, which implements
OP_OBJC_NSSTRING.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* eval.c: Include c-exp.h.
* c-exp.h (class objc_nsstring_operation): New.

Add c-exp.h and c_string_operation

This adds the new file c-exp.h, where C operation classes will be
declared.  The first such class, c_string_operation, is also added
here.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* c-lang.c (c_string_operation::evaluate): New method.
* c-exp.h: New file.

Introduce ternop_cond_operation

This adds class ternop_cond_operation, which implements TERNOP_COND.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class ternop_cond_operation): New.
* ax-gdb.c (ternop_cond_operation::do_generate_ax): New method.

Introduce ternop_slice_operation

This adds class ternop_slice_operation, which implements TERNOP_SLICE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class ternop_slice_operation): New.
* eval.c (eval_op_ternop): No longer static.

Introduce string_operation

This adds string_operation, which implements OP_STRING for most
languages (C has its own variant).

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class string_operation): New.
* eval.c (eval_op_string): No longer static.

Introduce internalvar_operation

This adds class internalvar_operation, which implements
OP_INTERNALVAR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class internalvar_operation): New.
* ax-gdb.c (internalvar_operation::do_generate_ax): New method.

Introduce bool_operation

This adds class bool_operation, which implements OP_BOOL.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class bool_operation): New.

Introduce register_operation

This adds class register_operation, which implements OP_REGISTER.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class register_operation): New.
* eval.c (eval_op_register): No longer static.
* ax-gdb.c (register_operation::do_generate_ax): New method.

Introduce last_operation

This adds class last_operation, which implements OP_LAST.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class last_operation): New.

Introduce func_static_var_operation

This adds class func_static_var_operation, which implements
OP_FUNC_STATIC_VAR.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class func_static_var_operation): New.
* eval.c (eval_op_func_static_var): No longer static.

Introduce var_entry_value_operation

This adds class var_entry_value_operation, which implements
OP_VAR_ENTRY_VALUE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class var_entry_value_operation): New.
* eval.c (eval_op_var_entry_value): No longer static.

Introduce var_msym_value_operation

This adds class var_msym_value_operation, which implements
OP_VAR_MSYM_VALUE.  A new method is added to class operation in order
to support a special case in minsym evaluation.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expression.h (class operation) <set_outermost>: New method.
* expop.h (class var_msym_value_operation): New.
* eval.c (eval_op_var_msym_value): No longer static.
(var_msym_value_operation::evaluate_for_address)
(var_msym_value_operation::evaluate_for_sizeof)
(var_msym_value_operation::evaluate_for_cast): New methods.
* ax-gdb.c (var_msym_value_operation::do_generate_ax): New
method.

Introduce long_const_operation

This adds class long_const_operation, which holds a scalar constant.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class long_const_operation): New.
* ax-gdb.c (long_const_operation::do_generate_ax): New method.

Introduce scope_operation

This adds class scope_operation, an implementation of OP_SCOPE.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (class scope_operation): New.
* eval.c (eval_op_scope): No longer static.
(scope_operation::evaluate_for_address): New method.
* ax-gdb.c (scope_operation::do_generate_ax): New method.

Introduce float_const_operation

This adds class float_const_operation, an operation holding a
floating-point constant.  Unlike most other new operations, this one
requires a custom 'dump' method.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expprint.c (float_const_operation::dump): New method.
* expop.h (float_data): New typedef.
(class float_const_operation): New.

Add two agent expression helper functions

This adds a couple of agent expression helper functions that will be
useful when implementing various operations.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expop.h (gen_expr_binop, gen_expr_structop): Declare.
* ax-gdb.c (gen_expr_binop): New function.
(gen_expr_structop): Likewise.

Implement dumping

This patch implements the dumping methods for tuple_holding_operation.
A number of overloads are used.  Note that no default case is given.
This approach makes it simple to detect when a new overload is needed
-- compilation will fail.  (There is an example of this in a later
patch in the series.)

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expprint.c (expr::dump_for_expression): New functions.
* expop.h (dump_for_expression): New overloads.
(tuple_holding_operation::dump, tuple_holding_operation::do_dump):
Update.

Introduce class operation

This patch introduces class operation, the new base class for all
expression operations.

In the new approach, an operation is simply a class that presents a
certain interface.  Operations own their operands, and management is
done via unique_ptr.

The operation interface is largely ad hoc, based on the evolution of
expression handling in GDB.  Parts (for example,
evaluate_with_coercion) are probably redundant; however I took this
approach to try to avoid mixing different kinds of refactorings.

In some specific situations, rather than add a generic method across
the entire operation class hierarchy, I chose instead to use
dynamic_cast and specialized methods on certain concrete subclasses.
This will appear in some subsequent patches.

One goal of this work is to avoid the kinds of easy-to-make errors
that affected the old implementation.  To this end, some helper
subclasses are also added here.  These helpers automate the
implementation of the 'dump', 'uses_objfile', and 'constant_p'
methods.  Nearly every concrete operation that is subsequently added
will use these facilities.  (Note that the 'dump' implementation is
only outlined here, the body appears in the next patch.)

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

* expression.h (expr::operation): New class.
(expr::make_operation): New function.
(expr::operation_up): New typedef.
* expop.h: New file.
* eval.c (operation::evaluate_for_cast)
(operation::evaluate_for_address, operation::evaluate_for_sizeof):
New methods.
* ax-gdb.c (operation::generate_ax): New method.