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// Copyright (C) 2020 Free Software Foundation, Inc.
// 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/>.
#ifndef RUST_MACRO_EXPAND_H
#define RUST_MACRO_EXPAND_H
#include "rust-ast.h"
#include "rust-macro.h"
// Provides objects and method prototypes for macro expansion
namespace Rust {
// forward decls for AST
namespace AST {
class MacroInvocation;
}
// Object used to store configuration data for macro expansion.
struct ExpansionCfg
{
// features?
unsigned int recursion_limit = 50; // TODO: determine default recursion limit
// trace macros?
// should test?
// more default stuff?
};
// Object used to store shared data (between functions) for macro expansion.
struct MacroExpander
{
ExpansionCfg cfg;
unsigned int expansion_depth = 0;
MacroExpander (AST::Crate &crate, ExpansionCfg cfg, Session &session)
: cfg (cfg), crate (crate), session (session)
{}
~MacroExpander () = default;
// Expands all macros in the crate passed in.
void expand_crate ();
/* Expands a macro invocation (not macro invocation semi) - possibly make both
* have similar duck-typed interface and use templates?*/
// should this be public or private?
void expand_invoc (std::unique_ptr<AST::MacroInvocation> &invoc);
// Expands a single declarative macro.
AST::ASTFragment expand_decl_macro (AST::MacroInvocData &invoc,
AST::MacroRulesDefinition &rules_def);
void expand_cfg_attrs (std::vector<AST::Attribute> &attrs);
bool fails_cfg (const std::vector<AST::Attribute> &attr) const;
bool fails_cfg_with_expand (std::vector<AST::Attribute> &attrs) const;
// Expand the data of a cfg! macro.
void parse_macro_to_meta_item (AST::MacroInvocData &invoc);
// Get the literal representation of a cfg! macro.
AST::Literal expand_cfg_macro (AST::MacroInvocData &invoc);
private:
AST::Crate &crate;
Session &session;
};
} // namespace Rust
#endif
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