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cppPointerType.cxx
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294 lines (253 loc) · 7.58 KB
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/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file cppPointerType.cxx
* @author drose
* @date 1999-10-19
*/
#include "cppPointerType.h"
#include "cppFunctionType.h"
#include "cppIdentifier.h"
#include "cppArrayType.h"
#include "cppStructType.h"
#include "cppSimpleType.h"
/**
*
*/
CPPPointerType::
CPPPointerType(CPPType *pointing_at) :
CPPType(CPPFile()),
_pointing_at(pointing_at)
{
}
/**
* Returns true if this declaration is an actual, factual declaration, or
* false if some part of the declaration depends on a template parameter which
* has not yet been instantiated.
*/
bool CPPPointerType::
is_fully_specified() const {
return CPPType::is_fully_specified() &&
_pointing_at->is_fully_specified();
}
/**
*
*/
CPPDeclaration *CPPPointerType::
substitute_decl(CPPDeclaration::SubstDecl &subst,
CPPScope *current_scope, CPPScope *global_scope) {
SubstDecl::const_iterator si = subst.find(this);
if (si != subst.end()) {
return (*si).second;
}
CPPPointerType *rep = new CPPPointerType(*this);
rep->_pointing_at =
_pointing_at->substitute_decl(subst, current_scope, global_scope)
->as_type();
if (rep->_pointing_at == _pointing_at) {
delete rep;
rep = this;
}
rep = CPPType::new_type(rep)->as_pointer_type();
subst.insert(SubstDecl::value_type(this, rep));
return rep;
}
/**
* If this CPPType object is a forward reference or other nonspecified
* reference to a type that might now be known a real type, returns the real
* type. Otherwise returns the type itself.
*/
CPPType *CPPPointerType::
resolve_type(CPPScope *current_scope, CPPScope *global_scope) {
CPPType *ptype = _pointing_at->resolve_type(current_scope, global_scope);
if (ptype != _pointing_at) {
CPPPointerType *rep = new CPPPointerType(*this);
rep->_pointing_at = ptype;
return CPPType::new_type(rep);
}
return this;
}
/**
* Returns true if the type, or any nested type within the type, is a
* CPPTBDType and thus isn't fully determined right now. In this case,
* calling resolve_type() may or may not resolve the type.
*/
bool CPPPointerType::
is_tbd() const {
return _pointing_at->is_tbd();
}
/**
* Returns true if the type is considered a standard layout type.
*/
bool CPPPointerType::
is_standard_layout() const {
return true;
}
/**
* Returns true if the type is considered a Plain Old Data (POD) type.
*/
bool CPPPointerType::
is_trivial() const {
return true;
}
/**
* Returns true if the type can be constructed using the given argument.
*/
bool CPPPointerType::
is_constructible(const CPPType *given_type) const {
given_type = ((CPPType *)given_type)->remove_reference()->remove_cv();
// Can convert from compatible pointer or array type.
CPPType *other_target;
switch (given_type->get_subtype()) {
case ST_array:
other_target = given_type->as_array_type()->_element_type;
break;
case ST_pointer:
other_target = given_type->as_pointer_type()->_pointing_at;
break;
case ST_simple:
// Can initialize from nullptr.
return given_type->as_simple_type()->_type == CPPSimpleType::T_nullptr;
default:
return false;
}
// Can't convert const to non-const pointer.
if (other_target->is_const() && !_pointing_at->is_const()) {
return false;
}
// Are we pointing to the same type? That's always OK.
const CPPType *a = _pointing_at->remove_cv();
const CPPType *b = other_target->remove_cv();
if (a == b || *a == *b) {
return true;
}
// Can initialize void pointer with any pointer.
const CPPSimpleType *simple_type = a->as_simple_type();
if (simple_type != nullptr) {
return simple_type->_type == CPPSimpleType::T_void;
}
// Can initialize from derived class pointer.
const CPPStructType *a_struct = a->as_struct_type();
const CPPStructType *b_struct = b->as_struct_type();
if (a_struct != nullptr && b_struct != nullptr) {
return a_struct->is_base_of(b_struct);
}
return false;
}
/**
* Returns true if the type is default-constructible.
*/
bool CPPPointerType::
is_default_constructible() const {
return true;
}
/**
* Returns true if the type is copy-constructible.
*/
bool CPPPointerType::
is_copy_constructible() const {
return true;
}
/**
* Returns true if the type is copy-assignable.
*/
bool CPPPointerType::
is_copy_assignable() const {
return true;
}
/**
* This is a little more forgiving than is_equal(): it returns true if the
* types appear to be referring to the same thing, even if they may have
* different pointers or somewhat different definitions. It's useful for
* parameter matching, etc.
*/
bool CPPPointerType::
is_equivalent(const CPPType &other) const {
const CPPPointerType *ot = ((CPPType *)&other)->as_pointer_type();
if (ot == nullptr) {
return CPPType::is_equivalent(other);
}
return _pointing_at->is_equivalent(*ot->_pointing_at);
}
/**
*
*/
void CPPPointerType::
output(std::ostream &out, int indent_level, CPPScope *scope, bool complete) const {
/*
CPPFunctionType *ftype = _pointing_at->as_function_type();
if (ftype != (CPPFunctionType *)NULL) {
// Pointers to functions are a bit of a special case; we have to be a
// little more careful about where the '*' goes.
string star = "*";
if ((ftype->_flags & CPPFunctionType::F_method_pointer) != 0) {
// We have to output pointers-to-method with a scoping before the '*'.
star = ftype->_class_owner->get_fully_scoped_name() + "::*";
}
_pointing_at->output_instance(out, indent_level, scope, complete,
star, "");
} else {
_pointing_at->output(out, indent_level, scope, complete);
out << " *";
}
*/
output_instance(out, indent_level, scope, complete, "", "");
}
/**
* Formats a C++-looking line that defines an instance of the given type, with
* the indicated name. In most cases this will be "type name", but some types
* have special exceptions.
*/
void CPPPointerType::
output_instance(std::ostream &out, int indent_level, CPPScope *scope,
bool complete, const std::string &prename,
const std::string &name) const {
std::string star = "*";
CPPFunctionType *ftype = _pointing_at->as_function_type();
if (ftype != nullptr &&
((ftype->_flags & CPPFunctionType::F_method_pointer) != 0)) {
// We have to output pointers-to-method with a scoping before the '*'.
star = ftype->_class_owner->get_fully_scoped_name() + "::*";
}
_pointing_at->output_instance(out, indent_level, scope, complete,
star + prename, name);
}
/**
*
*/
CPPDeclaration::SubType CPPPointerType::
get_subtype() const {
return ST_pointer;
}
/**
*
*/
CPPPointerType *CPPPointerType::
as_pointer_type() {
return this;
}
/**
* Called by CPPDeclaration() to determine whether this type is equivalent to
* another type of the same type.
*/
bool CPPPointerType::
is_equal(const CPPDeclaration *other) const {
const CPPPointerType *ot = ((CPPDeclaration *)other)->as_pointer_type();
assert(ot != nullptr);
return _pointing_at == ot->_pointing_at;
}
/**
* Called by CPPDeclaration() to determine whether this type should be ordered
* before another type of the same type, in an arbitrary but fixed ordering.
*/
bool CPPPointerType::
is_less(const CPPDeclaration *other) const {
const CPPPointerType *ot = ((CPPDeclaration *)other)->as_pointer_type();
assert(ot != nullptr);
return _pointing_at < ot->_pointing_at;
}