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// Copyright (C) 2020-2022 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-diagnostics.h"
#include "rust-expr.h"
#include "rust-session-manager.h"
#include "rust-macro-invoc-lexer.h"
#include "rust-lex.h"
#include "rust-parse.h"
namespace Rust {
namespace {
std::unique_ptr<AST::Expr>
make_string (Location locus, std::string value)
{
return std::unique_ptr<AST::Expr> (
new AST::LiteralExpr (value, AST::Literal::STRING,
PrimitiveCoreType::CORETYPE_STR, {}, locus));
}
/* Parse a single string literal from the given delimited token tree,
and return the LiteralExpr for it. Allow for an optional trailing comma,
but otherwise enforce that these are the only tokens. */
std::unique_ptr<AST::LiteralExpr>
parse_single_string_literal (AST::DelimTokenTree &invoc_token_tree,
Location invoc_locus)
{
MacroInvocLexer lex (invoc_token_tree.to_token_stream ());
Parser<MacroInvocLexer> parser (std::move (lex));
auto last_token_id = TokenId::RIGHT_CURLY;
switch (invoc_token_tree.get_delim_type ())
{
case AST::DelimType::PARENS:
last_token_id = TokenId::RIGHT_PAREN;
rust_assert (parser.skip_token (LEFT_PAREN));
break;
case AST::DelimType::CURLY:
rust_assert (parser.skip_token (LEFT_CURLY));
break;
case AST::DelimType::SQUARE:
last_token_id = TokenId::RIGHT_SQUARE;
rust_assert (parser.skip_token (LEFT_SQUARE));
break;
}
std::unique_ptr<AST::LiteralExpr> lit_expr = nullptr;
if (parser.peek_current_token ()->get_id () == STRING_LITERAL)
{
lit_expr = parser.parse_literal_expr ();
parser.maybe_skip_token (COMMA);
if (parser.peek_current_token ()->get_id () != last_token_id)
{
lit_expr = nullptr;
rust_error_at (invoc_locus, "macro takes 1 argument");
}
}
else if (parser.peek_current_token ()->get_id () == last_token_id)
rust_error_at (invoc_locus, "macro takes 1 argument");
else
rust_error_at (invoc_locus, "argument must be a string literal");
parser.skip_token (last_token_id);
return lit_expr;
}
/* Treat PATH as a path relative to the source file currently being
compiled, and return the absolute path for it. */
std::string
source_relative_path (std::string path, Location locus)
{
std::string compile_fname
= Session::get_instance ().linemap->location_file (locus);
auto dir_separator_pos = compile_fname.rfind (file_separator);
/* If there is no file_separator in the path, use current dir ('.'). */
std::string dirname;
if (dir_separator_pos == std::string::npos)
dirname = std::string (".") + file_separator;
else
dirname = compile_fname.substr (0, dir_separator_pos) + file_separator;
return dirname + path;
}
/* Read the full contents of the file FILENAME and return them in a vector.
FIXME: platform specific. */
std::vector<uint8_t>
load_file_bytes (const char *filename)
{
RAIIFile file_wrap (filename);
if (file_wrap.get_raw () == nullptr)
{
rust_error_at (Location (), "cannot open filename %s: %m", filename);
return std::vector<uint8_t> ();
}
FILE *f = file_wrap.get_raw ();
fseek (f, 0L, SEEK_END);
long fsize = ftell (f);
fseek (f, 0L, SEEK_SET);
std::vector<uint8_t> buf (fsize);
if (fread (&buf[0], fsize, 1, f) != 1)
{
rust_error_at (Location (), "error reading file %s: %m", filename);
return std::vector<uint8_t> ();
}
return buf;
}
} // namespace
AST::ASTFragment
MacroBuiltin::assert (Location invoc_locus, AST::MacroInvocData &invoc)
{
rust_debug ("assert!() called");
return AST::ASTFragment::create_error ();
}
AST::ASTFragment
MacroBuiltin::file (Location invoc_locus, AST::MacroInvocData &invoc)
{
auto current_file
= Session::get_instance ().linemap->location_file (invoc_locus);
auto file_str = AST::SingleASTNode (make_string (invoc_locus, current_file));
return AST::ASTFragment ({file_str});
}
AST::ASTFragment
MacroBuiltin::column (Location invoc_locus, AST::MacroInvocData &invoc)
{
auto current_column
= Session::get_instance ().linemap->location_to_column (invoc_locus);
// auto column_no
// = AST::SingleASTNode (make_string (invoc_locus, current_column));
auto column_no = AST::SingleASTNode (std::unique_ptr<AST::Expr> (
new AST::LiteralExpr (std::to_string (current_column), AST::Literal::INT,
PrimitiveCoreType::CORETYPE_U32, {}, invoc_locus)));
return AST::ASTFragment ({column_no});
}
/* Expand builtin macro include_bytes!("filename"), which includes the contents
of the given file as reference to a byte array. Yields an expression of type
&'static [u8; N]. */
AST::ASTFragment
MacroBuiltin::include_bytes (Location invoc_locus, AST::MacroInvocData &invoc)
{
/* Get target filename from the macro invocation, which is treated as a path
relative to the include!-ing file (currently being compiled). */
auto lit_expr
= parse_single_string_literal (invoc.get_delim_tok_tree (), invoc_locus);
if (lit_expr == nullptr)
return AST::ASTFragment::create_error ();
std::string target_filename
= source_relative_path (lit_expr->as_string (), invoc_locus);
std::vector<uint8_t> bytes = load_file_bytes (target_filename.c_str ());
/* Is there a more efficient way to do this? */
std::vector<std::unique_ptr<AST::Expr>> elts;
for (uint8_t b : bytes)
{
elts.emplace_back (
new AST::LiteralExpr (std::string (1, (char) b), AST::Literal::BYTE,
PrimitiveCoreType::CORETYPE_U8,
{} /* outer_attrs */, invoc_locus));
}
auto elems = std::unique_ptr<AST::ArrayElems> (
new AST::ArrayElemsValues (std::move (elts), invoc_locus));
auto array = std::unique_ptr<AST::Expr> (
new AST::ArrayExpr (std::move (elems), {}, {}, invoc_locus));
auto borrow = std::unique_ptr<AST::Expr> (
new AST::BorrowExpr (std::move (array), false, false, {}, invoc_locus));
auto node = AST::SingleASTNode (std::move (borrow));
return AST::ASTFragment ({node});
}
/* Expand builtin macro include_str!("filename"), which includes the contents
of the given file as a string. The file must be UTF-8 encoded. Yields an
expression of type &'static str. */
AST::ASTFragment
MacroBuiltin::include_str (Location invoc_locus, AST::MacroInvocData &invoc)
{
/* Get target filename from the macro invocation, which is treated as a path
relative to the include!-ing file (currently being compiled). */
auto lit_expr
= parse_single_string_literal (invoc.get_delim_tok_tree (), invoc_locus);
if (lit_expr == nullptr)
return AST::ASTFragment::create_error ();
std::string target_filename
= source_relative_path (lit_expr->as_string (), invoc_locus);
std::vector<uint8_t> bytes = load_file_bytes (target_filename.c_str ());
/* FIXME: Enforce that the file contents are valid UTF-8. */
std::string str ((const char *) &bytes[0], bytes.size ());
auto node = AST::SingleASTNode (make_string (invoc_locus, str));
return AST::ASTFragment ({node});
}
/* Expand builtin macro compile_error!("error"), which forces a compile error
during the compile time. */
AST::ASTFragment
MacroBuiltin::compile_error (Location invoc_locus, AST::MacroInvocData &invoc)
{
auto lit_expr
= parse_single_string_literal (invoc.get_delim_tok_tree (), invoc_locus);
if (lit_expr == nullptr)
return AST::ASTFragment::create_error ();
std::string error_string = lit_expr->as_string ();
rust_error_at (invoc_locus, "%s", error_string.c_str ());
return AST::ASTFragment::create_error ();
}
} // namespace Rust
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