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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* expand/asm.cpp
* - asm! macro
*/
#include <common.hpp>
#include <synext_macro.hpp>
#include <synext.hpp> // for Expand_BareExpr
#include <parse/tokentree.hpp>
#include <parse/ttstream.hpp>
#include <parse/common.hpp>
#include <parse/parseerror.hpp>
#include <ast/expr.hpp> // for ExprNode_*
#include <parse/interpolated_fragment.hpp>
namespace
{
::std::string get_string(const Span& sp, TokenStream& lex, const ::AST::Crate& crate, AST::Module& mod)
{
auto n = Parse_ExprVal(lex);
ASSERT_BUG(sp, n, "No expression returned");
Expand_BareExpr(crate, mod, n);
auto* format_string_np = dynamic_cast<AST::ExprNode_String*>(&*n);
if( !format_string_np ) {
ERROR(sp, E0000, "asm! requires a string literal - got " << *n);
}
//const auto& format_string_sp = format_string_np->span();
return mv$( format_string_np->m_value );
}
}
class CAsmExpander:
public ExpandProcMacro
{
::std::unique_ptr<TokenStream> expand(const Span& sp, const ::AST::Crate& crate, const ::std::string& ident, const TokenTree& tt, AST::Module& mod) override
{
Token tok;
auto lex = TTStream(sp, tt);
if( ident != "" )
ERROR(sp, E0000, "asm! doesn't take an ident");
auto template_text = get_string(sp, lex, crate, mod);
::std::vector<::AST::ExprNode_Asm::ValRef> outputs;
::std::vector<::AST::ExprNode_Asm::ValRef> inputs;
::std::vector<::std::string> clobbers;
::std::vector<::std::string> flags;
// Outputs
if( lex.lookahead(0) == TOK_DOUBLE_COLON )
{
GET_TOK(tok, lex);
lex.putback(Token(TOK_COLON));
}
else if( lex.lookahead(0) == TOK_COLON )
{
GET_TOK(tok, lex);
while( lex.lookahead(0) == TOK_STRING )
{
//auto name = get_string(sp, lex);
GET_CHECK_TOK(tok, lex, TOK_STRING);
auto name = mv$(tok.str());
GET_CHECK_TOK(tok, lex, TOK_PAREN_OPEN);
auto val = Parse_Expr0(lex);
GET_CHECK_TOK(tok, lex, TOK_PAREN_CLOSE);
outputs.push_back( ::AST::ExprNode_Asm::ValRef { mv$(name), mv$(val) } );
if( lex.lookahead(0) != TOK_COMMA )
break;
GET_TOK(tok, lex);
}
}
else
{
}
// Inputs
if( lex.lookahead(0) == TOK_DOUBLE_COLON )
{
GET_TOK(tok, lex);
lex.putback(Token(TOK_COLON));
}
else if( lex.lookahead(0) == TOK_COLON )
{
GET_TOK(tok, lex);
while( lex.lookahead(0) == TOK_STRING )
{
GET_CHECK_TOK(tok, lex, TOK_STRING);
auto name = mv$(tok.str());
GET_CHECK_TOK(tok, lex, TOK_PAREN_OPEN);
auto val = Parse_Expr0(lex);
GET_CHECK_TOK(tok, lex, TOK_PAREN_CLOSE);
inputs.push_back( ::AST::ExprNode_Asm::ValRef { mv$(name), mv$(val) } );
if( lex.lookahead(0) != TOK_COMMA )
break;
GET_TOK(tok, lex);
}
}
else
{
}
// Clobbers
if( lex.lookahead(0) == TOK_DOUBLE_COLON )
{
GET_TOK(tok, lex);
lex.putback(Token(TOK_COLON));
}
else if( lex.lookahead(0) == TOK_COLON )
{
GET_TOK(tok, lex);
while( lex.lookahead(0) == TOK_STRING )
{
GET_CHECK_TOK(tok, lex, TOK_STRING);
clobbers.push_back( mv$(tok.str()) );
if( lex.lookahead(0) != TOK_COMMA )
break;
GET_TOK(tok, lex);
}
}
else
{
}
// Flags
if( lex.lookahead(0) == TOK_DOUBLE_COLON )
{
GET_TOK(tok, lex);
lex.putback(Token(TOK_COLON));
}
else if( lex.lookahead(0) == TOK_COLON )
{
GET_TOK(tok, lex);
while( lex.lookahead(0) == TOK_STRING )
{
GET_CHECK_TOK(tok, lex, TOK_STRING);
flags.push_back( mv$(tok.str()) );
if( lex.lookahead(0) != TOK_COMMA )
break;
GET_TOK(tok, lex);
}
}
else
{
}
// trailing `: voltaile` - TODO: Is this valid?
if( lex.lookahead(0) == TOK_DOUBLE_COLON )
{
GET_TOK(tok, lex);
lex.putback(Token(TOK_COLON));
}
else if( lex.lookahead(0) == TOK_COLON )
{
GET_TOK(tok, lex);
if( GET_TOK(tok, lex) == TOK_IDENT && tok.str() == "volatile" )
{
flags.push_back( "volatile" );
}
else
{
PUTBACK(tok, lex);
}
}
else
{
}
// has to be the end
if( lex.lookahead(0) != TOK_EOF )
{
ERROR(sp, E0000, "Unexpected token in asm! - " << lex.getToken());
}
// Convert this into an AST node and insert as an intepolated expression
::AST::ExprNodeP rv = ::AST::ExprNodeP( new ::AST::ExprNode_Asm { mv$(template_text), mv$(outputs), mv$(inputs), mv$(clobbers), mv$(flags) } );
return box$( TTStreamO(sp, TokenTree(Token( InterpolatedFragment(InterpolatedFragment::EXPR, rv.release()) ))));
}
};
STATIC_MACRO("asm", CAsmExpander);
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