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// Copyright (C) 2020-2025 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/>.
#include "rust-macro-builtins.h"
#include "rust-macro-builtins-helpers.h"
#include "rust-macro-invoc-lexer.h"
namespace Rust {
struct AsmParseError
{
};
// This is just an enum to hold some operands right now.
enum InlineAsmDirSpec
{
In,
Out,
InOut,
SplitInOut,
Const,
Sym,
Label,
};
enum InlineAsmOptions
{
};
typedef std::string symbol_name;
typedef std::vector<AST::Expr> Templates;
typedef std::vector<InlineAsmDirSpec> Operands;
typedef std::map<std::string, int> RegisterArgs;
typedef std::map<symbol_name, int> ClobberAbis;
typedef std::map<symbol_name, int> NamedValues;
struct AsmArg
{
Templates templates;
Operands operands;
std::map<symbol_name, int> named_values;
RegisterArgs register_arguments;
ClobberAbis clobber_abis;
InlineAsmOptions options;
std::vector<InlineAsmOptions>
options_span; // TODO: @badumbatish @jjasmine I have no idea what span do, i
// copied it out of rustc_builtin_macros/src/asm.rs
};
tl::optional<AsmArg>
parseAsmArg (Parser<MacroInvocLexer> &p, bool is_global_asm);
static tl::optional<AST::Fragment>
parse_global_asm (location_t invoc_locus, AST::MacroInvocData &invoc);
static tl::optional<AST::Fragment>
parse_nonglobal_asm (location_t invoc_locus, AST::MacroInvocData &invoc);
static tl::optional<AST::Fragment>
parse_asm (location_t invoc_locus, AST::MacroInvocData &invoc,
bool is_global_asm);
tl::optional<InlineAsmDirSpec>
parseDirSpec (Parser<MacroInvocLexer> &p, TokenId last_token_id)
{
return tl::nullopt;
}
tl::optional<AsmArg>
parseAsmArg (Parser<MacroInvocLexer> &p, bool is_global_asm)
{
return tl::nullopt;
}
tl::optional<std::string>
parse_format_string (Parser<MacroInvocLexer> &parser, TokenId last_token_id)
{
auto token = parser.peek_current_token ();
if (token->get_id () != last_token_id && token->get_id () == STRING_LITERAL)
{
// very nice, we got a supposedly formatted string.
std::cout << token->get_token_description () << std::endl;
parser.skip_token ();
return "formatted string";
}
else
{
parser.skip_token ();
std::cout << token->get_token_description () << std::endl;
rust_error_at (token->get_locus (),
"asm template must be a string literal");
return tl::nullopt;
}
}
tl::optional<AST::Fragment>
MacroBuiltin::global_asm_handler (location_t invoc_locus,
AST::MacroInvocData &invoc)
{
// Just to clarify the code
bool is_global_asm = true;
return parse_asm (invoc_locus, invoc, is_global_asm);
}
tl::optional<AST::Fragment>
MacroBuiltin::nonglobal_asm_handler (location_t invoc_locus,
AST::MacroInvocData &invoc)
{
// Just to clarify the code
bool is_global_asm = false;
return parse_asm (invoc_locus, invoc, is_global_asm);
}
static tl::optional<AST::Fragment>
parse_asm (location_t invoc_locus, AST::MacroInvocData &invoc,
bool is_global_asm)
{
// From the rule of asm.
// We first peek and see if it is a format string or not.
// If yes, we process the first ever format string, and move on to the
// recurrent of format string Else we exit out
// After that, we peek and see if it is a reoccuring stream of format string
// or not. If it is, keep on going to do this format string. Else, move on
// After that, we peek and see if it is a reoccuring stream of operands or not
// If it is, keep on going to do this operand thingy.
// Else, move on
// We check if there is an optional "," at the end, per ABNF spec.
// If it is, consume it.
// Done
MacroInvocLexer lex (invoc.get_delim_tok_tree ().to_token_stream ());
Parser<MacroInvocLexer> parser (lex);
auto last_token_id = macro_end_token (invoc.get_delim_tok_tree (), parser);
// Parse the first ever formatted string, success or not, will skip 1 token
auto fm_string = parse_format_string (parser, last_token_id);
if (fm_string == tl::nullopt)
return tl::nullopt;
// formatted string stream
auto token = parser.peek_current_token ();
while (token->get_id () != last_token_id)
{
std::cout << token->get_token_description () << std::endl;
token = parser.peek_current_token ();
if (token->get_id () != COMMA)
{
break;
}
parser.skip_token ();
// Ok after the comma is good, we better be parsing correctly everything
// in here, which is formatted string in ABNF
fm_string = parse_format_string (parser, last_token_id);
}
// operands stream
token = parser.peek_current_token ();
while (token->get_id () != last_token_id)
{
std::cout << token->get_token_description () << std::endl;
token = parser.peek_current_token ();
if (token->get_id () != COMMA)
{
break;
}
parser.skip_token ();
// Ok after the left paren is good, we better be parsing correctly
// everything in here, which is operand in ABNF
// TODO: Work on parsing operands
fm_string = parse_format_string (parser, last_token_id);
}
// TODO: Handle the optional ","
return tl::nullopt;
}
} // namespace Rust
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