mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 05:29:47 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74728 91177308-0d34-0410-b5e6-96231b3b80d8
899 lines
28 KiB
C++
899 lines
28 KiB
C++
//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements the parser for assembly files.
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//
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//===----------------------------------------------------------------------===//
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#include "AsmParser.h"
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#include "AsmExpr.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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void AsmParser::Warning(SMLoc L, const char *Msg) {
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Lexer.PrintMessage(L, Msg, "warning");
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}
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bool AsmParser::Error(SMLoc L, const char *Msg) {
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Lexer.PrintMessage(L, Msg, "error");
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return true;
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}
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bool AsmParser::TokError(const char *Msg) {
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Lexer.PrintMessage(Lexer.getLoc(), Msg, "error");
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return true;
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}
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bool AsmParser::Run() {
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// Prime the lexer.
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Lexer.Lex();
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bool HadError = false;
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// While we have input, parse each statement.
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while (Lexer.isNot(asmtok::Eof)) {
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if (!ParseStatement()) continue;
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// If we had an error, remember it and recover by skipping to the next line.
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HadError = true;
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EatToEndOfStatement();
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}
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return HadError;
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}
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/// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
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void AsmParser::EatToEndOfStatement() {
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while (Lexer.isNot(asmtok::EndOfStatement) &&
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Lexer.isNot(asmtok::Eof))
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Lexer.Lex();
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// Eat EOL.
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if (Lexer.is(asmtok::EndOfStatement))
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Lexer.Lex();
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}
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/// ParseParenExpr - Parse a paren expression and return it.
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/// NOTE: This assumes the leading '(' has already been consumed.
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///
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/// parenexpr ::= expr)
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///
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bool AsmParser::ParseParenExpr(AsmExpr *&Res) {
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if (ParseExpression(Res)) return true;
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if (Lexer.isNot(asmtok::RParen))
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return TokError("expected ')' in parentheses expression");
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Lexer.Lex();
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return false;
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}
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/// ParsePrimaryExpr - Parse a primary expression and return it.
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/// primaryexpr ::= (parenexpr
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/// primaryexpr ::= symbol
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/// primaryexpr ::= number
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/// primaryexpr ::= ~,+,- primaryexpr
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bool AsmParser::ParsePrimaryExpr(AsmExpr *&Res) {
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switch (Lexer.getKind()) {
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default:
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return TokError("unknown token in expression");
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case asmtok::Exclaim:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = new AsmUnaryExpr(AsmUnaryExpr::LNot, Res);
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return false;
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case asmtok::Identifier: {
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// This is a label, this should be parsed as part of an expression, to
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// handle things like LFOO+4.
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
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// If this is use of an undefined symbol then mark it external.
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if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
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Sym->setExternal(true);
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Res = new AsmSymbolRefExpr(Sym);
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Lexer.Lex(); // Eat identifier.
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return false;
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}
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case asmtok::IntVal:
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Res = new AsmConstantExpr(Lexer.getCurIntVal());
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Lexer.Lex(); // Eat identifier.
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return false;
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case asmtok::LParen:
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Lexer.Lex(); // Eat the '('.
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return ParseParenExpr(Res);
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case asmtok::Minus:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = new AsmUnaryExpr(AsmUnaryExpr::Minus, Res);
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return false;
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case asmtok::Plus:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = new AsmUnaryExpr(AsmUnaryExpr::Plus, Res);
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return false;
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case asmtok::Tilde:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = new AsmUnaryExpr(AsmUnaryExpr::Not, Res);
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return false;
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}
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}
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/// ParseExpression - Parse an expression and return it.
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///
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/// expr ::= expr +,- expr -> lowest.
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/// expr ::= expr |,^,&,! expr -> middle.
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/// expr ::= expr *,/,%,<<,>> expr -> highest.
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/// expr ::= primaryexpr
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///
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bool AsmParser::ParseExpression(AsmExpr *&Res) {
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Res = 0;
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return ParsePrimaryExpr(Res) ||
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ParseBinOpRHS(1, Res);
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}
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bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
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AsmExpr *Expr;
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SMLoc StartLoc = Lexer.getLoc();
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if (ParseExpression(Expr))
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return true;
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if (!Expr->EvaluateAsAbsolute(Ctx, Res))
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return Error(StartLoc, "expected absolute expression");
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return false;
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}
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bool AsmParser::ParseRelocatableExpression(MCValue &Res) {
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AsmExpr *Expr;
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SMLoc StartLoc = Lexer.getLoc();
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if (ParseExpression(Expr))
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return true;
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if (!Expr->EvaluateAsRelocatable(Ctx, Res))
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return Error(StartLoc, "expected relocatable expression");
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return false;
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}
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bool AsmParser::ParseParenRelocatableExpression(MCValue &Res) {
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AsmExpr *Expr;
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SMLoc StartLoc = Lexer.getLoc();
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if (ParseParenExpr(Expr))
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return true;
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if (!Expr->EvaluateAsRelocatable(Ctx, Res))
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return Error(StartLoc, "expected relocatable expression");
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return false;
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}
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static unsigned getBinOpPrecedence(asmtok::TokKind K,
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AsmBinaryExpr::Opcode &Kind) {
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switch (K) {
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default: return 0; // not a binop.
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// Lowest Precedence: &&, ||
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case asmtok::AmpAmp:
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Kind = AsmBinaryExpr::LAnd;
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return 1;
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case asmtok::PipePipe:
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Kind = AsmBinaryExpr::LOr;
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return 1;
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// Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
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case asmtok::Plus:
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Kind = AsmBinaryExpr::Add;
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return 2;
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case asmtok::Minus:
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Kind = AsmBinaryExpr::Sub;
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return 2;
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case asmtok::EqualEqual:
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Kind = AsmBinaryExpr::EQ;
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return 2;
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case asmtok::ExclaimEqual:
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case asmtok::LessGreater:
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Kind = AsmBinaryExpr::NE;
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return 2;
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case asmtok::Less:
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Kind = AsmBinaryExpr::LT;
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return 2;
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case asmtok::LessEqual:
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Kind = AsmBinaryExpr::LTE;
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return 2;
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case asmtok::Greater:
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Kind = AsmBinaryExpr::GT;
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return 2;
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case asmtok::GreaterEqual:
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Kind = AsmBinaryExpr::GTE;
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return 2;
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// Intermediate Precedence: |, &, ^
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//
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// FIXME: gas seems to support '!' as an infix operator?
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case asmtok::Pipe:
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Kind = AsmBinaryExpr::Or;
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return 3;
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case asmtok::Caret:
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Kind = AsmBinaryExpr::Xor;
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return 3;
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case asmtok::Amp:
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Kind = AsmBinaryExpr::And;
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return 3;
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// Highest Precedence: *, /, %, <<, >>
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case asmtok::Star:
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Kind = AsmBinaryExpr::Mul;
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return 4;
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case asmtok::Slash:
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Kind = AsmBinaryExpr::Div;
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return 4;
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case asmtok::Percent:
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Kind = AsmBinaryExpr::Mod;
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return 4;
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case asmtok::LessLess:
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Kind = AsmBinaryExpr::Shl;
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return 4;
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case asmtok::GreaterGreater:
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Kind = AsmBinaryExpr::Shr;
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return 4;
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}
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}
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/// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
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/// Res contains the LHS of the expression on input.
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bool AsmParser::ParseBinOpRHS(unsigned Precedence, AsmExpr *&Res) {
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while (1) {
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AsmBinaryExpr::Opcode Kind = AsmBinaryExpr::Add;
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unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
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// If the next token is lower precedence than we are allowed to eat, return
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// successfully with what we ate already.
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if (TokPrec < Precedence)
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return false;
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Lexer.Lex();
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// Eat the next primary expression.
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AsmExpr *RHS;
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if (ParsePrimaryExpr(RHS)) return true;
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// If BinOp binds less tightly with RHS than the operator after RHS, let
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// the pending operator take RHS as its LHS.
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AsmBinaryExpr::Opcode Dummy;
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unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
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if (TokPrec < NextTokPrec) {
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if (ParseBinOpRHS(Precedence+1, RHS)) return true;
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}
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// Merge LHS and RHS according to operator.
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Res = new AsmBinaryExpr(Kind, Res, RHS);
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}
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}
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/// ParseStatement:
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/// ::= EndOfStatement
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/// ::= Label* Directive ...Operands... EndOfStatement
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/// ::= Label* Identifier OperandList* EndOfStatement
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bool AsmParser::ParseStatement() {
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switch (Lexer.getKind()) {
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default:
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return TokError("unexpected token at start of statement");
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case asmtok::EndOfStatement:
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Lexer.Lex();
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return false;
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case asmtok::Identifier:
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break;
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// TODO: Recurse on local labels etc.
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}
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// If we have an identifier, handle it as the key symbol.
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SMLoc IDLoc = Lexer.getLoc();
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const char *IDVal = Lexer.getCurStrVal();
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// Consume the identifier, see what is after it.
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switch (Lexer.Lex()) {
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case asmtok::Colon: {
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// identifier ':' -> Label.
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Lexer.Lex();
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// Diagnose attempt to use a variable as a label.
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//
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// FIXME: Diagnostics. Note the location of the definition as a label.
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// FIXME: This doesn't diagnose assignment to a symbol which has been
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// implicitly marked as external.
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(IDVal);
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if (Sym->getSection())
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return Error(IDLoc, "invalid symbol redefinition");
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if (Ctx.GetSymbolValue(Sym))
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return Error(IDLoc, "symbol already used as assembler variable");
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// Since we saw a label, create a symbol and emit it.
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// FIXME: If the label starts with L it is an assembler temporary label.
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// Why does the client of this api need to know this?
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Out.EmitLabel(Sym);
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return ParseStatement();
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}
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case asmtok::Equal:
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// identifier '=' ... -> assignment statement
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Lexer.Lex();
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return ParseAssignment(IDVal, false);
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default: // Normal instruction or directive.
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break;
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}
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// Otherwise, we have a normal instruction or directive.
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if (IDVal[0] == '.') {
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// FIXME: This should be driven based on a hash lookup and callback.
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if (!strcmp(IDVal, ".section"))
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return ParseDirectiveDarwinSection();
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if (!strcmp(IDVal, ".text"))
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// FIXME: This changes behavior based on the -static flag to the
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// assembler.
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return ParseDirectiveSectionSwitch("__TEXT,__text",
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"regular,pure_instructions");
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if (!strcmp(IDVal, ".const"))
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return ParseDirectiveSectionSwitch("__TEXT,__const");
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if (!strcmp(IDVal, ".static_const"))
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return ParseDirectiveSectionSwitch("__TEXT,__static_const");
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if (!strcmp(IDVal, ".cstring"))
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return ParseDirectiveSectionSwitch("__TEXT,__cstring",
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"cstring_literals");
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if (!strcmp(IDVal, ".literal4"))
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return ParseDirectiveSectionSwitch("__TEXT,__literal4", "4byte_literals");
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if (!strcmp(IDVal, ".literal8"))
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return ParseDirectiveSectionSwitch("__TEXT,__literal8", "8byte_literals");
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if (!strcmp(IDVal, ".literal16"))
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return ParseDirectiveSectionSwitch("__TEXT,__literal16",
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"16byte_literals");
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if (!strcmp(IDVal, ".constructor"))
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return ParseDirectiveSectionSwitch("__TEXT,__constructor");
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if (!strcmp(IDVal, ".destructor"))
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return ParseDirectiveSectionSwitch("__TEXT,__destructor");
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if (!strcmp(IDVal, ".fvmlib_init0"))
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return ParseDirectiveSectionSwitch("__TEXT,__fvmlib_init0");
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if (!strcmp(IDVal, ".fvmlib_init1"))
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return ParseDirectiveSectionSwitch("__TEXT,__fvmlib_init1");
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if (!strcmp(IDVal, ".symbol_stub")) // FIXME: Different on PPC.
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return ParseDirectiveSectionSwitch("__IMPORT,__jump_table,symbol_stubs",
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"self_modifying_code+pure_instructions,5");
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// FIXME: .picsymbol_stub on PPC.
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if (!strcmp(IDVal, ".data"))
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return ParseDirectiveSectionSwitch("__DATA,__data");
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if (!strcmp(IDVal, ".static_data"))
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return ParseDirectiveSectionSwitch("__DATA,__static_data");
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if (!strcmp(IDVal, ".non_lazy_symbol_pointer"))
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return ParseDirectiveSectionSwitch("__DATA,__nl_symbol_pointer",
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"non_lazy_symbol_pointers");
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if (!strcmp(IDVal, ".lazy_symbol_pointer"))
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return ParseDirectiveSectionSwitch("__DATA,__la_symbol_pointer",
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"lazy_symbol_pointers");
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if (!strcmp(IDVal, ".dyld"))
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return ParseDirectiveSectionSwitch("__DATA,__dyld");
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if (!strcmp(IDVal, ".mod_init_func"))
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return ParseDirectiveSectionSwitch("__DATA,__mod_init_func",
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"mod_init_funcs");
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if (!strcmp(IDVal, ".mod_term_func"))
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return ParseDirectiveSectionSwitch("__DATA,__mod_term_func",
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"mod_term_funcs");
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if (!strcmp(IDVal, ".const_data"))
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return ParseDirectiveSectionSwitch("__DATA,__const", "regular");
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// FIXME: Verify attributes on sections.
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if (!strcmp(IDVal, ".objc_class"))
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return ParseDirectiveSectionSwitch("__OBJC,__class");
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if (!strcmp(IDVal, ".objc_meta_class"))
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return ParseDirectiveSectionSwitch("__OBJC,__meta_class");
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if (!strcmp(IDVal, ".objc_cat_cls_meth"))
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return ParseDirectiveSectionSwitch("__OBJC,__cat_cls_meth");
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if (!strcmp(IDVal, ".objc_cat_inst_meth"))
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return ParseDirectiveSectionSwitch("__OBJC,__cat_inst_meth");
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if (!strcmp(IDVal, ".objc_protocol"))
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return ParseDirectiveSectionSwitch("__OBJC,__protocol");
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if (!strcmp(IDVal, ".objc_string_object"))
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return ParseDirectiveSectionSwitch("__OBJC,__string_object");
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if (!strcmp(IDVal, ".objc_cls_meth"))
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return ParseDirectiveSectionSwitch("__OBJC,__cls_meth");
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if (!strcmp(IDVal, ".objc_inst_meth"))
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return ParseDirectiveSectionSwitch("__OBJC,__inst_meth");
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if (!strcmp(IDVal, ".objc_cls_refs"))
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return ParseDirectiveSectionSwitch("__OBJC,__cls_refs");
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if (!strcmp(IDVal, ".objc_message_refs"))
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return ParseDirectiveSectionSwitch("__OBJC,__message_refs");
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if (!strcmp(IDVal, ".objc_symbols"))
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return ParseDirectiveSectionSwitch("__OBJC,__symbols");
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if (!strcmp(IDVal, ".objc_category"))
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return ParseDirectiveSectionSwitch("__OBJC,__category");
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if (!strcmp(IDVal, ".objc_class_vars"))
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return ParseDirectiveSectionSwitch("__OBJC,__class_vars");
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if (!strcmp(IDVal, ".objc_instance_vars"))
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return ParseDirectiveSectionSwitch("__OBJC,__instance_vars");
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if (!strcmp(IDVal, ".objc_module_info"))
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return ParseDirectiveSectionSwitch("__OBJC,__module_info");
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if (!strcmp(IDVal, ".objc_class_names"))
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return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
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if (!strcmp(IDVal, ".objc_meth_var_types"))
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return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
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if (!strcmp(IDVal, ".objc_meth_var_names"))
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return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
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if (!strcmp(IDVal, ".objc_selector_strs"))
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return ParseDirectiveSectionSwitch("__OBJC,__selector_strs");
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// Assembler features
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if (!strcmp(IDVal, ".set"))
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return ParseDirectiveSet();
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// Data directives
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if (!strcmp(IDVal, ".ascii"))
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return ParseDirectiveAscii(false);
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if (!strcmp(IDVal, ".asciz"))
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return ParseDirectiveAscii(true);
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// FIXME: Target hooks for size? Also for "word", "hword".
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if (!strcmp(IDVal, ".byte"))
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return ParseDirectiveValue(1);
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if (!strcmp(IDVal, ".short"))
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return ParseDirectiveValue(2);
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if (!strcmp(IDVal, ".long"))
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return ParseDirectiveValue(4);
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if (!strcmp(IDVal, ".quad"))
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return ParseDirectiveValue(8);
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// FIXME: Target hooks for IsPow2.
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if (!strcmp(IDVal, ".align"))
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return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
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if (!strcmp(IDVal, ".align32"))
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return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
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if (!strcmp(IDVal, ".balign"))
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return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
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if (!strcmp(IDVal, ".balignw"))
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return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
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if (!strcmp(IDVal, ".balignl"))
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return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
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if (!strcmp(IDVal, ".p2align"))
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return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
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if (!strcmp(IDVal, ".p2alignw"))
|
|
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
|
|
if (!strcmp(IDVal, ".p2alignl"))
|
|
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
|
|
|
|
if (!strcmp(IDVal, ".org"))
|
|
return ParseDirectiveOrg();
|
|
|
|
if (!strcmp(IDVal, ".fill"))
|
|
return ParseDirectiveFill();
|
|
if (!strcmp(IDVal, ".space"))
|
|
return ParseDirectiveSpace();
|
|
|
|
// Symbol attribute directives
|
|
if (!strcmp(IDVal, ".globl") || !strcmp(IDVal, ".global"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::Global);
|
|
if (!strcmp(IDVal, ".hidden"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::Hidden);
|
|
if (!strcmp(IDVal, ".indirect_symbol"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::IndirectSymbol);
|
|
if (!strcmp(IDVal, ".internal"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::Internal);
|
|
if (!strcmp(IDVal, ".lazy_reference"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::LazyReference);
|
|
if (!strcmp(IDVal, ".no_dead_strip"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::NoDeadStrip);
|
|
if (!strcmp(IDVal, ".private_extern"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::PrivateExtern);
|
|
if (!strcmp(IDVal, ".protected"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::Protected);
|
|
if (!strcmp(IDVal, ".reference"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::Reference);
|
|
if (!strcmp(IDVal, ".weak"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::Weak);
|
|
if (!strcmp(IDVal, ".weak_definition"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::WeakDefinition);
|
|
if (!strcmp(IDVal, ".weak_reference"))
|
|
return ParseDirectiveSymbolAttribute(MCStreamer::WeakReference);
|
|
|
|
Warning(IDLoc, "ignoring directive for now");
|
|
EatToEndOfStatement();
|
|
return false;
|
|
}
|
|
|
|
MCInst Inst;
|
|
if (ParseX86InstOperands(IDVal, Inst))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in argument list");
|
|
|
|
// Eat the end of statement marker.
|
|
Lexer.Lex();
|
|
|
|
// Instruction is good, process it.
|
|
Out.EmitInstruction(Inst);
|
|
|
|
// Skip to end of line for now.
|
|
return false;
|
|
}
|
|
|
|
bool AsmParser::ParseAssignment(const char *Name, bool IsDotSet) {
|
|
// FIXME: Use better location, we should use proper tokens.
|
|
SMLoc EqualLoc = Lexer.getLoc();
|
|
|
|
MCValue Value;
|
|
if (ParseRelocatableExpression(Value))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in assignment");
|
|
|
|
// Eat the end of statement marker.
|
|
Lexer.Lex();
|
|
|
|
// Diagnose assignment to a label.
|
|
//
|
|
// FIXME: Diagnostics. Note the location of the definition as a label.
|
|
// FIXME: This doesn't diagnose assignment to a symbol which has been
|
|
// implicitly marked as external.
|
|
// FIXME: Handle '.'.
|
|
// FIXME: Diagnose assignment to protected identifier (e.g., register name).
|
|
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
|
|
if (Sym->getSection())
|
|
return Error(EqualLoc, "invalid assignment to symbol emitted as a label");
|
|
if (Sym->isExternal())
|
|
return Error(EqualLoc, "invalid assignment to external symbol");
|
|
|
|
// Do the assignment.
|
|
Out.EmitAssignment(Sym, Value, IsDotSet);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveSet:
|
|
/// ::= .set identifier ',' expression
|
|
bool AsmParser::ParseDirectiveSet() {
|
|
if (Lexer.isNot(asmtok::Identifier))
|
|
return TokError("expected identifier after '.set' directive");
|
|
|
|
const char *Name = Lexer.getCurStrVal();
|
|
|
|
if (Lexer.Lex() != asmtok::Comma)
|
|
return TokError("unexpected token in '.set'");
|
|
Lexer.Lex();
|
|
|
|
return ParseAssignment(Name, true);
|
|
}
|
|
|
|
/// ParseDirectiveSection:
|
|
/// ::= .section identifier (',' identifier)*
|
|
/// FIXME: This should actually parse out the segment, section, attributes and
|
|
/// sizeof_stub fields.
|
|
bool AsmParser::ParseDirectiveDarwinSection() {
|
|
if (Lexer.isNot(asmtok::Identifier))
|
|
return TokError("expected identifier after '.section' directive");
|
|
|
|
std::string Section = Lexer.getCurStrVal();
|
|
Lexer.Lex();
|
|
|
|
// Accept a comma separated list of modifiers.
|
|
while (Lexer.is(asmtok::Comma)) {
|
|
Lexer.Lex();
|
|
|
|
if (Lexer.isNot(asmtok::Identifier))
|
|
return TokError("expected identifier in '.section' directive");
|
|
Section += ',';
|
|
Section += Lexer.getCurStrVal();
|
|
Lexer.Lex();
|
|
}
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in '.section' directive");
|
|
Lexer.Lex();
|
|
|
|
Out.SwitchSection(Ctx.GetSection(Section.c_str()));
|
|
return false;
|
|
}
|
|
|
|
bool AsmParser::ParseDirectiveSectionSwitch(const char *Section,
|
|
const char *Directives) {
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in section switching directive");
|
|
Lexer.Lex();
|
|
|
|
std::string SectionStr = Section;
|
|
if (Directives && Directives[0]) {
|
|
SectionStr += ",";
|
|
SectionStr += Directives;
|
|
}
|
|
|
|
Out.SwitchSection(Ctx.GetSection(Section));
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveAscii:
|
|
/// ::= ( .ascii | .asciz ) [ "string" ( , "string" )* ]
|
|
bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
for (;;) {
|
|
if (Lexer.isNot(asmtok::String))
|
|
return TokError("expected string in '.ascii' or '.asciz' directive");
|
|
|
|
// FIXME: This shouldn't use a const char* + strlen, the string could have
|
|
// embedded nulls.
|
|
// FIXME: Should have accessor for getting string contents.
|
|
const char *Str = Lexer.getCurStrVal();
|
|
Out.EmitBytes(Str + 1, strlen(Str) - 2);
|
|
if (ZeroTerminated)
|
|
Out.EmitBytes("\0", 1);
|
|
|
|
Lexer.Lex();
|
|
|
|
if (Lexer.is(asmtok::EndOfStatement))
|
|
break;
|
|
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in '.ascii' or '.asciz' directive");
|
|
Lexer.Lex();
|
|
}
|
|
}
|
|
|
|
Lexer.Lex();
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveValue
|
|
/// ::= (.byte | .short | ... ) [ expression (, expression)* ]
|
|
bool AsmParser::ParseDirectiveValue(unsigned Size) {
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
for (;;) {
|
|
MCValue Expr;
|
|
if (ParseRelocatableExpression(Expr))
|
|
return true;
|
|
|
|
Out.EmitValue(Expr, Size);
|
|
|
|
if (Lexer.is(asmtok::EndOfStatement))
|
|
break;
|
|
|
|
// FIXME: Improve diagnostic.
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in directive");
|
|
Lexer.Lex();
|
|
}
|
|
}
|
|
|
|
Lexer.Lex();
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveSpace
|
|
/// ::= .space expression [ , expression ]
|
|
bool AsmParser::ParseDirectiveSpace() {
|
|
int64_t NumBytes;
|
|
if (ParseAbsoluteExpression(NumBytes))
|
|
return true;
|
|
|
|
int64_t FillExpr = 0;
|
|
bool HasFillExpr = false;
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in '.space' directive");
|
|
Lexer.Lex();
|
|
|
|
if (ParseAbsoluteExpression(FillExpr))
|
|
return true;
|
|
|
|
HasFillExpr = true;
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in '.space' directive");
|
|
}
|
|
|
|
Lexer.Lex();
|
|
|
|
if (NumBytes <= 0)
|
|
return TokError("invalid number of bytes in '.space' directive");
|
|
|
|
// FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
|
|
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
|
|
Out.EmitValue(MCValue::get(FillExpr), 1);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveFill
|
|
/// ::= .fill expression , expression , expression
|
|
bool AsmParser::ParseDirectiveFill() {
|
|
int64_t NumValues;
|
|
if (ParseAbsoluteExpression(NumValues))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in '.fill' directive");
|
|
Lexer.Lex();
|
|
|
|
int64_t FillSize;
|
|
if (ParseAbsoluteExpression(FillSize))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in '.fill' directive");
|
|
Lexer.Lex();
|
|
|
|
int64_t FillExpr;
|
|
if (ParseAbsoluteExpression(FillExpr))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in '.fill' directive");
|
|
|
|
Lexer.Lex();
|
|
|
|
if (FillSize != 1 && FillSize != 2 && FillSize != 4)
|
|
return TokError("invalid '.fill' size, expected 1, 2, or 4");
|
|
|
|
for (uint64_t i = 0, e = NumValues; i != e; ++i)
|
|
Out.EmitValue(MCValue::get(FillExpr), FillSize);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveOrg
|
|
/// ::= .org expression [ , expression ]
|
|
bool AsmParser::ParseDirectiveOrg() {
|
|
MCValue Offset;
|
|
if (ParseRelocatableExpression(Offset))
|
|
return true;
|
|
|
|
// Parse optional fill expression.
|
|
int64_t FillExpr = 0;
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in '.org' directive");
|
|
Lexer.Lex();
|
|
|
|
if (ParseAbsoluteExpression(FillExpr))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in '.org' directive");
|
|
}
|
|
|
|
Lexer.Lex();
|
|
|
|
// FIXME: Only limited forms of relocatable expressions are accepted here, it
|
|
// has to be relative to the current section.
|
|
Out.EmitValueToOffset(Offset, FillExpr);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveAlign
|
|
/// ::= {.align, ...} expression [ , expression [ , expression ]]
|
|
bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
|
|
int64_t Alignment;
|
|
if (ParseAbsoluteExpression(Alignment))
|
|
return true;
|
|
|
|
SMLoc MaxBytesLoc;
|
|
bool HasFillExpr = false;
|
|
int64_t FillExpr = 0;
|
|
int64_t MaxBytesToFill = 0;
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in directive");
|
|
Lexer.Lex();
|
|
|
|
// The fill expression can be omitted while specifying a maximum number of
|
|
// alignment bytes, e.g:
|
|
// .align 3,,4
|
|
if (Lexer.isNot(asmtok::Comma)) {
|
|
HasFillExpr = true;
|
|
if (ParseAbsoluteExpression(FillExpr))
|
|
return true;
|
|
}
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in directive");
|
|
Lexer.Lex();
|
|
|
|
MaxBytesLoc = Lexer.getLoc();
|
|
if (ParseAbsoluteExpression(MaxBytesToFill))
|
|
return true;
|
|
|
|
if (Lexer.isNot(asmtok::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
}
|
|
}
|
|
|
|
Lexer.Lex();
|
|
|
|
if (!HasFillExpr) {
|
|
// FIXME: Sometimes fill with nop.
|
|
FillExpr = 0;
|
|
}
|
|
|
|
// Compute alignment in bytes.
|
|
if (IsPow2) {
|
|
// FIXME: Diagnose overflow.
|
|
Alignment = 1 << Alignment;
|
|
}
|
|
|
|
// Diagnose non-sensical max bytes to fill.
|
|
if (MaxBytesLoc.isValid()) {
|
|
if (MaxBytesToFill < 1) {
|
|
Warning(MaxBytesLoc, "alignment directive can never be satisfied in this "
|
|
"many bytes, ignoring");
|
|
return false;
|
|
}
|
|
|
|
if (MaxBytesToFill >= Alignment) {
|
|
Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
|
|
"has no effect");
|
|
MaxBytesToFill = 0;
|
|
}
|
|
}
|
|
|
|
// FIXME: Target specific behavior about how the "extra" bytes are filled.
|
|
Out.EmitValueToAlignment(Alignment, FillExpr, ValueSize, MaxBytesToFill);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveSymbolAttribute
|
|
/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
|
|
bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
|
|
if (Lexer.isNot(asmtok::EndOfStatement)) {
|
|
for (;;) {
|
|
if (Lexer.isNot(asmtok::Identifier))
|
|
return TokError("expected identifier in directive");
|
|
|
|
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
|
|
Lexer.Lex();
|
|
|
|
// If this is use of an undefined symbol then mark it external.
|
|
if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
|
|
Sym->setExternal(true);
|
|
|
|
Out.EmitSymbolAttribute(Sym, Attr);
|
|
|
|
if (Lexer.is(asmtok::EndOfStatement))
|
|
break;
|
|
|
|
if (Lexer.isNot(asmtok::Comma))
|
|
return TokError("unexpected token in directive");
|
|
Lexer.Lex();
|
|
}
|
|
}
|
|
|
|
Lexer.Lex();
|
|
return false;
|
|
}
|