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/* Type stack for GDB parser.
Copyright (C) 1986-2021 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/>. */
#ifndef TYPE_STACK_H
#define TYPE_STACK_H
#include "gdbtypes.h"
#include <vector>
struct type;
struct expr_builder;
/* For parsing of complicated types.
An array should be preceded in the list by the size of the array. */
enum type_pieces
{
tp_end = -1,
tp_pointer,
tp_reference,
tp_rvalue_reference,
tp_array,
tp_function,
tp_function_with_arguments,
tp_const,
tp_volatile,
tp_space_identifier,
tp_atomic,
tp_restrict,
tp_type_stack,
tp_kind
};
/* The stack can contain either an enum type_pieces or an int. */
union type_stack_elt
{
enum type_pieces piece;
int int_val;
struct type_stack *stack_val;
std::vector<struct type *> *typelist_val;
};
/* The type stack is an instance of this structure. */
struct type_stack
{
public:
type_stack () = default;
DISABLE_COPY_AND_ASSIGN (type_stack);
type_stack *create ()
{
type_stack *result = new type_stack ();
result->m_elements = std::move (m_elements);
return result;
}
/* Insert a new type, TP, at the bottom of the type stack. If TP is
tp_pointer, tp_reference or tp_rvalue_reference, it is inserted at the
bottom. If TP is a qualifier, it is inserted at slot 1 (just above a
previous tp_pointer) if there is anything on the stack, or simply pushed
if the stack is empty. Other values for TP are invalid. */
void insert (enum type_pieces tp);
void push (enum type_pieces tp)
{
type_stack_elt elt;
elt.piece = tp;
m_elements.push_back (elt);
}
void push (int n)
{
type_stack_elt elt;
elt.int_val = n;
m_elements.push_back (elt);
}
/* Push the type stack STACK as an element on this type stack. */
void push (struct type_stack *stack)
{
type_stack_elt elt;
elt.stack_val = stack;
m_elements.push_back (elt);
push (tp_type_stack);
}
/* Push a function type with arguments onto the global type stack.
LIST holds the argument types. If the final item in LIST is NULL,
then the function will be varargs. */
void push (std::vector<struct type *> *list)
{
type_stack_elt elt;
elt.typelist_val = list;
m_elements.push_back (elt);
push (tp_function_with_arguments);
}
enum type_pieces pop ()
{
if (m_elements.empty ())
return tp_end;
type_stack_elt elt = m_elements.back ();
m_elements.pop_back ();
return elt.piece;
}
int pop_int ()
{
if (m_elements.empty ())
{
/* "Can't happen". */
return 0;
}
type_stack_elt elt = m_elements.back ();
m_elements.pop_back ();
return elt.int_val;
}
std::vector<struct type *> *pop_typelist ()
{
gdb_assert (!m_elements.empty ());
type_stack_elt elt = m_elements.back ();
m_elements.pop_back ();
return elt.typelist_val;
}
/* Pop a type_stack element. */
struct type_stack *pop_type_stack ()
{
gdb_assert (!m_elements.empty ());
type_stack_elt elt = m_elements.back ();
m_elements.pop_back ();
return elt.stack_val;
}
/* Insert a tp_space_identifier and the corresponding address space
value into the stack. STRING is the name of an address space, as
recognized by address_space_name_to_type_instance_flags. If the
stack is empty, the new elements are simply pushed. If the stack
is not empty, this function assumes that the first item on the
stack is a tp_pointer, and the new values are inserted above the
first item. */
void insert (struct expr_builder *pstate, const char *string);
/* Append the elements of the type stack FROM to the type stack
THIS. Always returns THIS. */
struct type_stack *append (struct type_stack *from)
{
m_elements.insert (m_elements.end (), from->m_elements.begin (),
from->m_elements.end ());
return this;
}
/* Pop the type stack and return a type_instance_flags that
corresponds the const/volatile qualifiers on the stack. This is
called by the C++ parser when parsing methods types, and as such no
other kind of type in the type stack is expected. */
type_instance_flags follow_type_instance_flags ();
/* Pop the type stack and return the type which corresponds to
FOLLOW_TYPE as modified by all the stuff on the stack. */
struct type *follow_types (struct type *follow_type);
private:
/* A helper function for insert_type and insert_type_address_space.
This does work of expanding the type stack and inserting the new
element, ELEMENT, into the stack at location SLOT. */
void insert_into (int slot, union type_stack_elt element)
{
gdb_assert (slot <= m_elements.size ());
m_elements.insert (m_elements.begin () + slot, element);
}
/* Elements on the stack. */
std::vector<union type_stack_elt> m_elements;
};
#endif /* TYPE_STACK_H */
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