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// go-gcc.cc -- Go frontend to gcc IR.
// Copyright (C) 2011 Free Software Foundation, Inc.
// Contributed by Ian Lance Taylor, Google.
// This file is part of GCC.
// GCC 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, or (at your option) any later
// version.
// GCC 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 GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "go-system.h"
// This has to be included outside of extern "C", so we have to
// include it here before tree.h includes it later.
#include <gmp.h>
#ifndef ENABLE_BUILD_WITH_CXX
extern "C"
{
#endif
#include "tree.h"
#ifndef ENABLE_BUILD_WITH_CXX
}
#endif
#include "backend.h"
// A class wrapping a tree.
class Gcc_tree
{
public:
Gcc_tree(tree t)
: t_(t)
{ }
tree
get_tree()
{ return this->t_; }
private:
tree t_;
};
// In gcc, types, expressions, and statements are all trees.
class Btype : public Gcc_tree
{
public:
Btype(tree t)
: Gcc_tree(t)
{ }
};
class Bexpression : public Gcc_tree
{
public:
Bexpression(tree t)
: Gcc_tree(t)
{ }
};
class Bstatement : public Gcc_tree
{
public:
Bstatement(tree t)
: Gcc_tree(t)
{ }
};
// This file implements the interface between the Go frontend proper
// and the gcc IR. This implements specific instantiations of
// abstract classes defined by the Go frontend proper. The Go
// frontend proper class methods of these classes to generate the
// backend representation.
class Gcc_backend : public Backend
{
public:
// Types.
Btype*
error_type()
{ gcc_unreachable(); }
Btype*
void_type()
{ gcc_unreachable(); }
Btype*
bool_type()
{ gcc_unreachable(); }
Btype*
integer_type(bool /* is_unsigned */, int /* bits */)
{ gcc_unreachable(); }
Btype*
float_type(int /* bits */)
{ gcc_unreachable(); }
Btype*
string_type()
{ gcc_unreachable(); }
Btype*
function_type(const Function_type*, Btype* /* receiver */,
const Btypes* /* parameters */,
const Btypes* /* results */)
{ gcc_unreachable(); }
Btype*
struct_type(const Struct_type*, const Btypes* /* field_types */)
{ gcc_unreachable(); }
Btype*
array_type(const Btype* /* element_type */, const Bexpression* /* length */)
{ gcc_unreachable(); }
Btype*
slice_type(const Btype* /* element_type */)
{ gcc_unreachable(); }
Btype*
map_type(const Btype* /* key_type */, const Btype* /* value_type */,
source_location)
{ gcc_unreachable(); }
Btype*
channel_type(const Btype* /* element_type */)
{ gcc_unreachable(); }
Btype*
interface_type(const Interface_type*, const Btypes* /* method_types */)
{ gcc_unreachable(); }
// Statements.
// Create an assignment statement.
Bstatement*
assignment(Bexpression* lhs, Bexpression* rhs,
source_location location);
private:
// Make a Bstatement from a tree.
Bstatement*
make_statement(tree t)
{ return new Bstatement(t); }
};
// Assignment.
Bstatement*
Gcc_backend::assignment(Bexpression* lhs, Bexpression* rhs,
source_location location)
{
return this->make_statement(fold_build2_loc(location, MODIFY_EXPR,
void_type_node,
lhs->get_tree(),
rhs->get_tree()));
}
// The single backend.
static Gcc_backend gcc_backend;
// Return the backend generator.
Backend*
go_get_backend()
{
return &gcc_backend;
}
// FIXME: Temporary functions while converting to the new backend
// interface.
Bexpression*
tree_to_expr(tree t)
{
return new Bexpression(t);
}
tree
statement_to_tree(Bstatement* bs)
{
return bs->get_tree();
}
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