1 //===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class implements the parser for assembly files.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/MC/MCParser/AsmParser.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/Twine.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCSectionMachO.h"
21 #include "llvm/MC/MCStreamer.h"
22 #include "llvm/MC/MCSymbol.h"
23 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
24 #include "llvm/Support/Compiler.h"
25 #include "llvm/Support/SourceMgr.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include "llvm/Target/TargetAsmParser.h"
31 enum { DEFAULT_ADDRSPACE = 0 };
33 AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
34 const MCAsmInfo &_MAI)
35 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), SrcMgr(_SM), TargetParser(0),
37 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
39 // Debugging directives.
40 AddDirectiveHandler(".file", &AsmParser::ParseDirectiveFile);
41 AddDirectiveHandler(".line", &AsmParser::ParseDirectiveLine);
42 AddDirectiveHandler(".loc", &AsmParser::ParseDirectiveLoc);
47 AsmParser::~AsmParser() {
50 void AsmParser::Warning(SMLoc L, const Twine &Msg) {
51 PrintMessage(L, Msg.str(), "warning");
54 bool AsmParser::Error(SMLoc L, const Twine &Msg) {
55 PrintMessage(L, Msg.str(), "error");
59 bool AsmParser::TokError(const char *Msg) {
60 PrintMessage(Lexer.getLoc(), Msg, "error");
64 void AsmParser::PrintMessage(SMLoc Loc, const std::string &Msg,
65 const char *Type) const {
66 SrcMgr.PrintMessage(Loc, Msg, Type);
69 bool AsmParser::EnterIncludeFile(const std::string &Filename) {
70 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc());
76 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
81 const AsmToken &AsmParser::Lex() {
82 const AsmToken *tok = &Lexer.Lex();
84 if (tok->is(AsmToken::Eof)) {
85 // If this is the end of an included file, pop the parent file off the
87 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
88 if (ParentIncludeLoc != SMLoc()) {
89 CurBuffer = SrcMgr.FindBufferContainingLoc(ParentIncludeLoc);
90 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer),
91 ParentIncludeLoc.getPointer());
96 if (tok->is(AsmToken::Error))
97 PrintMessage(Lexer.getErrLoc(), Lexer.getErr(), "error");
102 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
103 // Create the initial section, if requested.
105 // FIXME: Target hook & command line option for initial section.
106 if (!NoInitialTextSection)
107 Out.SwitchSection(Ctx.getMachOSection("__TEXT", "__text",
108 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
109 0, SectionKind::getText()));
114 bool HadError = false;
116 AsmCond StartingCondState = TheCondState;
118 // While we have input, parse each statement.
119 while (Lexer.isNot(AsmToken::Eof)) {
120 if (!ParseStatement()) continue;
122 // We had an error, remember it and recover by skipping to the next line.
124 EatToEndOfStatement();
127 if (TheCondState.TheCond != StartingCondState.TheCond ||
128 TheCondState.Ignore != StartingCondState.Ignore)
129 return TokError("unmatched .ifs or .elses");
131 // Finalize the output stream if there are no errors and if the client wants
133 if (!HadError && !NoFinalize)
139 /// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
140 void AsmParser::EatToEndOfStatement() {
141 while (Lexer.isNot(AsmToken::EndOfStatement) &&
142 Lexer.isNot(AsmToken::Eof))
146 if (Lexer.is(AsmToken::EndOfStatement))
151 /// ParseParenExpr - Parse a paren expression and return it.
152 /// NOTE: This assumes the leading '(' has already been consumed.
154 /// parenexpr ::= expr)
156 bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
157 if (ParseExpression(Res)) return true;
158 if (Lexer.isNot(AsmToken::RParen))
159 return TokError("expected ')' in parentheses expression");
160 EndLoc = Lexer.getLoc();
165 MCSymbol *AsmParser::CreateSymbol(StringRef Name) {
166 // FIXME: Inline into callers.
167 return Ctx.GetOrCreateSymbol(Name);
170 /// ParsePrimaryExpr - Parse a primary expression and return it.
171 /// primaryexpr ::= (parenexpr
172 /// primaryexpr ::= symbol
173 /// primaryexpr ::= number
174 /// primaryexpr ::= '.'
175 /// primaryexpr ::= ~,+,- primaryexpr
176 bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
177 switch (Lexer.getKind()) {
179 return TokError("unknown token in expression");
180 case AsmToken::Exclaim:
181 Lex(); // Eat the operator.
182 if (ParsePrimaryExpr(Res, EndLoc))
184 Res = MCUnaryExpr::CreateLNot(Res, getContext());
186 case AsmToken::String:
187 case AsmToken::Identifier: {
188 // This is a symbol reference.
189 std::pair<StringRef, StringRef> Split = getTok().getIdentifier().split('@');
190 MCSymbol *Sym = CreateSymbol(Split.first);
192 // Lookup the symbol variant if used.
193 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
194 if (Split.first.size() != getTok().getIdentifier().size())
195 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
197 EndLoc = Lexer.getLoc();
198 Lex(); // Eat identifier.
200 // If this is an absolute variable reference, substitute it now to preserve
201 // semantics in the face of reassignment.
202 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
204 return Error(EndLoc, "unexpected modified on variable reference");
206 Res = Sym->getVariableValue();
210 // Otherwise create a symbol ref.
211 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
214 case AsmToken::Integer:
215 Res = MCConstantExpr::Create(getTok().getIntVal(), getContext());
216 EndLoc = Lexer.getLoc();
219 case AsmToken::Dot: {
220 // This is a '.' reference, which references the current PC. Emit a
221 // temporary label to the streamer and refer to it.
222 MCSymbol *Sym = Ctx.CreateTempSymbol();
224 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
225 EndLoc = Lexer.getLoc();
226 Lex(); // Eat identifier.
230 case AsmToken::LParen:
231 Lex(); // Eat the '('.
232 return ParseParenExpr(Res, EndLoc);
233 case AsmToken::Minus:
234 Lex(); // Eat the operator.
235 if (ParsePrimaryExpr(Res, EndLoc))
237 Res = MCUnaryExpr::CreateMinus(Res, getContext());
240 Lex(); // Eat the operator.
241 if (ParsePrimaryExpr(Res, EndLoc))
243 Res = MCUnaryExpr::CreatePlus(Res, getContext());
245 case AsmToken::Tilde:
246 Lex(); // Eat the operator.
247 if (ParsePrimaryExpr(Res, EndLoc))
249 Res = MCUnaryExpr::CreateNot(Res, getContext());
254 bool AsmParser::ParseExpression(const MCExpr *&Res) {
256 return ParseExpression(Res, EndLoc);
259 /// ParseExpression - Parse an expression and return it.
261 /// expr ::= expr +,- expr -> lowest.
262 /// expr ::= expr |,^,&,! expr -> middle.
263 /// expr ::= expr *,/,%,<<,>> expr -> highest.
264 /// expr ::= primaryexpr
266 bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
267 // Parse the expression.
269 if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
272 // Try to constant fold it up front, if possible.
274 if (Res->EvaluateAsAbsolute(Value))
275 Res = MCConstantExpr::Create(Value, getContext());
280 bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
282 return ParseParenExpr(Res, EndLoc) ||
283 ParseBinOpRHS(1, Res, EndLoc);
286 bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
289 SMLoc StartLoc = Lexer.getLoc();
290 if (ParseExpression(Expr))
293 if (!Expr->EvaluateAsAbsolute(Res))
294 return Error(StartLoc, "expected absolute expression");
299 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
300 MCBinaryExpr::Opcode &Kind) {
303 return 0; // not a binop.
305 // Lowest Precedence: &&, ||
306 case AsmToken::AmpAmp:
307 Kind = MCBinaryExpr::LAnd;
309 case AsmToken::PipePipe:
310 Kind = MCBinaryExpr::LOr;
313 // Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
315 Kind = MCBinaryExpr::Add;
317 case AsmToken::Minus:
318 Kind = MCBinaryExpr::Sub;
320 case AsmToken::EqualEqual:
321 Kind = MCBinaryExpr::EQ;
323 case AsmToken::ExclaimEqual:
324 case AsmToken::LessGreater:
325 Kind = MCBinaryExpr::NE;
328 Kind = MCBinaryExpr::LT;
330 case AsmToken::LessEqual:
331 Kind = MCBinaryExpr::LTE;
333 case AsmToken::Greater:
334 Kind = MCBinaryExpr::GT;
336 case AsmToken::GreaterEqual:
337 Kind = MCBinaryExpr::GTE;
340 // Intermediate Precedence: |, &, ^
342 // FIXME: gas seems to support '!' as an infix operator?
344 Kind = MCBinaryExpr::Or;
346 case AsmToken::Caret:
347 Kind = MCBinaryExpr::Xor;
350 Kind = MCBinaryExpr::And;
353 // Highest Precedence: *, /, %, <<, >>
355 Kind = MCBinaryExpr::Mul;
357 case AsmToken::Slash:
358 Kind = MCBinaryExpr::Div;
360 case AsmToken::Percent:
361 Kind = MCBinaryExpr::Mod;
363 case AsmToken::LessLess:
364 Kind = MCBinaryExpr::Shl;
366 case AsmToken::GreaterGreater:
367 Kind = MCBinaryExpr::Shr;
373 /// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
374 /// Res contains the LHS of the expression on input.
375 bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
378 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
379 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
381 // If the next token is lower precedence than we are allowed to eat, return
382 // successfully with what we ate already.
383 if (TokPrec < Precedence)
388 // Eat the next primary expression.
390 if (ParsePrimaryExpr(RHS, EndLoc)) return true;
392 // If BinOp binds less tightly with RHS than the operator after RHS, let
393 // the pending operator take RHS as its LHS.
394 MCBinaryExpr::Opcode Dummy;
395 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
396 if (TokPrec < NextTokPrec) {
397 if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true;
400 // Merge LHS and RHS according to operator.
401 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
409 /// ::= EndOfStatement
410 /// ::= Label* Directive ...Operands... EndOfStatement
411 /// ::= Label* Identifier OperandList* EndOfStatement
412 bool AsmParser::ParseStatement() {
413 if (Lexer.is(AsmToken::EndOfStatement)) {
418 // Statements always start with an identifier.
419 AsmToken ID = getTok();
420 SMLoc IDLoc = ID.getLoc();
422 if (ParseIdentifier(IDVal)) {
423 if (!TheCondState.Ignore)
424 return TokError("unexpected token at start of statement");
428 // Handle conditional assembly here before checking for skipping. We
429 // have to do this so that .endif isn't skipped in a ".if 0" block for
432 return ParseDirectiveIf(IDLoc);
433 if (IDVal == ".elseif")
434 return ParseDirectiveElseIf(IDLoc);
435 if (IDVal == ".else")
436 return ParseDirectiveElse(IDLoc);
437 if (IDVal == ".endif")
438 return ParseDirectiveEndIf(IDLoc);
440 // If we are in a ".if 0" block, ignore this statement.
441 if (TheCondState.Ignore) {
442 EatToEndOfStatement();
446 // FIXME: Recurse on local labels?
448 // See what kind of statement we have.
449 switch (Lexer.getKind()) {
450 case AsmToken::Colon: {
451 // identifier ':' -> Label.
454 // Diagnose attempt to use a variable as a label.
456 // FIXME: Diagnostics. Note the location of the definition as a label.
457 // FIXME: This doesn't diagnose assignment to a symbol which has been
458 // implicitly marked as external.
459 MCSymbol *Sym = CreateSymbol(IDVal);
460 if (!Sym->isUndefined() || Sym->isVariable())
461 return Error(IDLoc, "invalid symbol redefinition");
466 return ParseStatement();
469 case AsmToken::Equal:
470 // identifier '=' ... -> assignment statement
473 return ParseAssignment(IDVal);
475 default: // Normal instruction or directive.
479 // Otherwise, we have a normal instruction or directive.
480 if (IDVal[0] == '.') {
481 // FIXME: This should be driven based on a hash lookup and callback.
482 if (IDVal == ".section")
483 return ParseDirectiveDarwinSection();
484 if (IDVal == ".text")
485 // FIXME: This changes behavior based on the -static flag to the
487 return ParseDirectiveSectionSwitch("__TEXT", "__text",
488 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
489 if (IDVal == ".const")
490 return ParseDirectiveSectionSwitch("__TEXT", "__const");
491 if (IDVal == ".static_const")
492 return ParseDirectiveSectionSwitch("__TEXT", "__static_const");
493 if (IDVal == ".cstring")
494 return ParseDirectiveSectionSwitch("__TEXT","__cstring",
495 MCSectionMachO::S_CSTRING_LITERALS);
496 if (IDVal == ".literal4")
497 return ParseDirectiveSectionSwitch("__TEXT", "__literal4",
498 MCSectionMachO::S_4BYTE_LITERALS,
500 if (IDVal == ".literal8")
501 return ParseDirectiveSectionSwitch("__TEXT", "__literal8",
502 MCSectionMachO::S_8BYTE_LITERALS,
504 if (IDVal == ".literal16")
505 return ParseDirectiveSectionSwitch("__TEXT","__literal16",
506 MCSectionMachO::S_16BYTE_LITERALS,
508 if (IDVal == ".constructor")
509 return ParseDirectiveSectionSwitch("__TEXT","__constructor");
510 if (IDVal == ".destructor")
511 return ParseDirectiveSectionSwitch("__TEXT","__destructor");
512 if (IDVal == ".fvmlib_init0")
513 return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init0");
514 if (IDVal == ".fvmlib_init1")
515 return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init1");
517 // FIXME: The assembler manual claims that this has the self modify code
518 // flag, at least on x86-32, but that does not appear to be correct.
519 if (IDVal == ".symbol_stub")
520 return ParseDirectiveSectionSwitch("__TEXT","__symbol_stub",
521 MCSectionMachO::S_SYMBOL_STUBS |
522 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
523 // FIXME: Different on PPC and ARM.
525 // FIXME: PowerPC only?
526 if (IDVal == ".picsymbol_stub")
527 return ParseDirectiveSectionSwitch("__TEXT","__picsymbol_stub",
528 MCSectionMachO::S_SYMBOL_STUBS |
529 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
531 if (IDVal == ".data")
532 return ParseDirectiveSectionSwitch("__DATA", "__data");
533 if (IDVal == ".static_data")
534 return ParseDirectiveSectionSwitch("__DATA", "__static_data");
536 // FIXME: The section names of these two are misspelled in the assembler
538 if (IDVal == ".non_lazy_symbol_pointer")
539 return ParseDirectiveSectionSwitch("__DATA", "__nl_symbol_ptr",
540 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
542 if (IDVal == ".lazy_symbol_pointer")
543 return ParseDirectiveSectionSwitch("__DATA", "__la_symbol_ptr",
544 MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
547 if (IDVal == ".dyld")
548 return ParseDirectiveSectionSwitch("__DATA", "__dyld");
549 if (IDVal == ".mod_init_func")
550 return ParseDirectiveSectionSwitch("__DATA", "__mod_init_func",
551 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
553 if (IDVal == ".mod_term_func")
554 return ParseDirectiveSectionSwitch("__DATA", "__mod_term_func",
555 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
557 if (IDVal == ".const_data")
558 return ParseDirectiveSectionSwitch("__DATA", "__const");
561 if (IDVal == ".objc_class")
562 return ParseDirectiveSectionSwitch("__OBJC", "__class",
563 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
564 if (IDVal == ".objc_meta_class")
565 return ParseDirectiveSectionSwitch("__OBJC", "__meta_class",
566 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
567 if (IDVal == ".objc_cat_cls_meth")
568 return ParseDirectiveSectionSwitch("__OBJC", "__cat_cls_meth",
569 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
570 if (IDVal == ".objc_cat_inst_meth")
571 return ParseDirectiveSectionSwitch("__OBJC", "__cat_inst_meth",
572 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
573 if (IDVal == ".objc_protocol")
574 return ParseDirectiveSectionSwitch("__OBJC", "__protocol",
575 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
576 if (IDVal == ".objc_string_object")
577 return ParseDirectiveSectionSwitch("__OBJC", "__string_object",
578 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
579 if (IDVal == ".objc_cls_meth")
580 return ParseDirectiveSectionSwitch("__OBJC", "__cls_meth",
581 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
582 if (IDVal == ".objc_inst_meth")
583 return ParseDirectiveSectionSwitch("__OBJC", "__inst_meth",
584 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
585 if (IDVal == ".objc_cls_refs")
586 return ParseDirectiveSectionSwitch("__OBJC", "__cls_refs",
587 MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
588 MCSectionMachO::S_LITERAL_POINTERS,
590 if (IDVal == ".objc_message_refs")
591 return ParseDirectiveSectionSwitch("__OBJC", "__message_refs",
592 MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
593 MCSectionMachO::S_LITERAL_POINTERS,
595 if (IDVal == ".objc_symbols")
596 return ParseDirectiveSectionSwitch("__OBJC", "__symbols",
597 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
598 if (IDVal == ".objc_category")
599 return ParseDirectiveSectionSwitch("__OBJC", "__category",
600 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
601 if (IDVal == ".objc_class_vars")
602 return ParseDirectiveSectionSwitch("__OBJC", "__class_vars",
603 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
604 if (IDVal == ".objc_instance_vars")
605 return ParseDirectiveSectionSwitch("__OBJC", "__instance_vars",
606 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
607 if (IDVal == ".objc_module_info")
608 return ParseDirectiveSectionSwitch("__OBJC", "__module_info",
609 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
610 if (IDVal == ".objc_class_names")
611 return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
612 MCSectionMachO::S_CSTRING_LITERALS);
613 if (IDVal == ".objc_meth_var_types")
614 return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
615 MCSectionMachO::S_CSTRING_LITERALS);
616 if (IDVal == ".objc_meth_var_names")
617 return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
618 MCSectionMachO::S_CSTRING_LITERALS);
619 if (IDVal == ".objc_selector_strs")
620 return ParseDirectiveSectionSwitch("__OBJC", "__selector_strs",
621 MCSectionMachO::S_CSTRING_LITERALS);
623 // Assembler features
625 return ParseDirectiveSet();
629 if (IDVal == ".ascii")
630 return ParseDirectiveAscii(false);
631 if (IDVal == ".asciz")
632 return ParseDirectiveAscii(true);
634 if (IDVal == ".byte")
635 return ParseDirectiveValue(1);
636 if (IDVal == ".short")
637 return ParseDirectiveValue(2);
638 if (IDVal == ".long")
639 return ParseDirectiveValue(4);
640 if (IDVal == ".quad")
641 return ParseDirectiveValue(8);
643 // FIXME: Target hooks for IsPow2.
644 if (IDVal == ".align")
645 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
646 if (IDVal == ".align32")
647 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
648 if (IDVal == ".balign")
649 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
650 if (IDVal == ".balignw")
651 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
652 if (IDVal == ".balignl")
653 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
654 if (IDVal == ".p2align")
655 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
656 if (IDVal == ".p2alignw")
657 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
658 if (IDVal == ".p2alignl")
659 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
662 return ParseDirectiveOrg();
664 if (IDVal == ".fill")
665 return ParseDirectiveFill();
666 if (IDVal == ".space")
667 return ParseDirectiveSpace();
669 // Symbol attribute directives
671 if (IDVal == ".globl" || IDVal == ".global")
672 return ParseDirectiveSymbolAttribute(MCSA_Global);
673 if (IDVal == ".hidden")
674 return ParseDirectiveSymbolAttribute(MCSA_Hidden);
675 if (IDVal == ".indirect_symbol")
676 return ParseDirectiveSymbolAttribute(MCSA_IndirectSymbol);
677 if (IDVal == ".internal")
678 return ParseDirectiveSymbolAttribute(MCSA_Internal);
679 if (IDVal == ".lazy_reference")
680 return ParseDirectiveSymbolAttribute(MCSA_LazyReference);
681 if (IDVal == ".no_dead_strip")
682 return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
683 if (IDVal == ".private_extern")
684 return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern);
685 if (IDVal == ".protected")
686 return ParseDirectiveSymbolAttribute(MCSA_Protected);
687 if (IDVal == ".reference")
688 return ParseDirectiveSymbolAttribute(MCSA_Reference);
689 if (IDVal == ".weak")
690 return ParseDirectiveSymbolAttribute(MCSA_Weak);
691 if (IDVal == ".weak_definition")
692 return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition);
693 if (IDVal == ".weak_reference")
694 return ParseDirectiveSymbolAttribute(MCSA_WeakReference);
696 if (IDVal == ".comm")
697 return ParseDirectiveComm(/*IsLocal=*/false);
698 if (IDVal == ".lcomm")
699 return ParseDirectiveComm(/*IsLocal=*/true);
700 if (IDVal == ".zerofill")
701 return ParseDirectiveDarwinZerofill();
702 if (IDVal == ".desc")
703 return ParseDirectiveDarwinSymbolDesc();
704 if (IDVal == ".lsym")
705 return ParseDirectiveDarwinLsym();
706 if (IDVal == ".tbss")
707 return ParseDirectiveDarwinTBSS();
709 if (IDVal == ".subsections_via_symbols")
710 return ParseDirectiveDarwinSubsectionsViaSymbols();
711 if (IDVal == ".abort")
712 return ParseDirectiveAbort();
713 if (IDVal == ".include")
714 return ParseDirectiveInclude();
715 if (IDVal == ".dump")
716 return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsDump=*/true);
717 if (IDVal == ".load")
718 return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsLoad=*/false);
720 // Look up the handler in the handler table,
721 bool(AsmParser::*Handler)(StringRef, SMLoc) = DirectiveMap[IDVal];
723 return (this->*Handler)(IDVal, IDLoc);
725 // Target hook for parsing target specific directives.
726 if (!getTargetParser().ParseDirective(ID))
729 Warning(IDLoc, "ignoring directive for now");
730 EatToEndOfStatement();
734 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
735 bool HadError = getTargetParser().ParseInstruction(IDVal, IDLoc,
737 if (!HadError && Lexer.isNot(AsmToken::EndOfStatement))
738 HadError = TokError("unexpected token in argument list");
740 // If parsing succeeded, match the instruction.
743 if (!getTargetParser().MatchInstruction(ParsedOperands, Inst)) {
744 // Emit the instruction on success.
745 Out.EmitInstruction(Inst);
747 // Otherwise emit a diagnostic about the match failure and set the error
750 // FIXME: We should give nicer diagnostics about the exact failure.
751 Error(IDLoc, "unrecognized instruction");
756 // If there was no error, consume the end-of-statement token. Otherwise this
757 // will be done by our caller.
761 // Free any parsed operands.
762 for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
763 delete ParsedOperands[i];
768 bool AsmParser::ParseAssignment(const StringRef &Name) {
769 // FIXME: Use better location, we should use proper tokens.
770 SMLoc EqualLoc = Lexer.getLoc();
773 SMLoc StartLoc = Lexer.getLoc();
774 if (ParseExpression(Value))
777 if (Lexer.isNot(AsmToken::EndOfStatement))
778 return TokError("unexpected token in assignment");
780 // Eat the end of statement marker.
783 // Validate that the LHS is allowed to be a variable (either it has not been
784 // used as a symbol, or it is an absolute symbol).
785 MCSymbol *Sym = getContext().LookupSymbol(Name);
787 // Diagnose assignment to a label.
789 // FIXME: Diagnostics. Note the location of the definition as a label.
790 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
791 if (!Sym->isUndefined() && !Sym->isAbsolute())
792 return Error(EqualLoc, "redefinition of '" + Name + "'");
793 else if (!Sym->isVariable())
794 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
795 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
796 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
799 Sym = CreateSymbol(Name);
801 // FIXME: Handle '.'.
803 // Do the assignment.
804 Out.EmitAssignment(Sym, Value);
812 bool AsmParser::ParseIdentifier(StringRef &Res) {
813 if (Lexer.isNot(AsmToken::Identifier) &&
814 Lexer.isNot(AsmToken::String))
817 Res = getTok().getIdentifier();
819 Lex(); // Consume the identifier token.
824 /// ParseDirectiveSet:
825 /// ::= .set identifier ',' expression
826 bool AsmParser::ParseDirectiveSet() {
829 if (ParseIdentifier(Name))
830 return TokError("expected identifier after '.set' directive");
832 if (Lexer.isNot(AsmToken::Comma))
833 return TokError("unexpected token in '.set'");
836 return ParseAssignment(Name);
839 /// ParseDirectiveSection:
840 /// ::= .section identifier (',' identifier)*
841 /// FIXME: This should actually parse out the segment, section, attributes and
842 /// sizeof_stub fields.
843 bool AsmParser::ParseDirectiveDarwinSection() {
844 SMLoc Loc = Lexer.getLoc();
846 StringRef SectionName;
847 if (ParseIdentifier(SectionName))
848 return Error(Loc, "expected identifier after '.section' directive");
850 // Verify there is a following comma.
851 if (!Lexer.is(AsmToken::Comma))
852 return TokError("unexpected token in '.section' directive");
854 std::string SectionSpec = SectionName;
857 // Add all the tokens until the end of the line, ParseSectionSpecifier will
859 StringRef EOL = Lexer.LexUntilEndOfStatement();
860 SectionSpec.append(EOL.begin(), EOL.end());
863 if (Lexer.isNot(AsmToken::EndOfStatement))
864 return TokError("unexpected token in '.section' directive");
868 StringRef Segment, Section;
869 unsigned TAA, StubSize;
870 std::string ErrorStr =
871 MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
874 if (!ErrorStr.empty())
875 return Error(Loc, ErrorStr.c_str());
877 // FIXME: Arch specific.
878 bool isText = Segment == "__TEXT"; // FIXME: Hack.
879 Out.SwitchSection(Ctx.getMachOSection(Segment, Section, TAA, StubSize,
880 isText ? SectionKind::getText()
881 : SectionKind::getDataRel()));
885 /// ParseDirectiveSectionSwitch -
886 bool AsmParser::ParseDirectiveSectionSwitch(const char *Segment,
888 unsigned TAA, unsigned Align,
890 if (Lexer.isNot(AsmToken::EndOfStatement))
891 return TokError("unexpected token in section switching directive");
894 // FIXME: Arch specific.
895 bool isText = StringRef(Segment) == "__TEXT"; // FIXME: Hack.
896 Out.SwitchSection(Ctx.getMachOSection(Segment, Section, TAA, StubSize,
897 isText ? SectionKind::getText()
898 : SectionKind::getDataRel()));
900 // Set the implicit alignment, if any.
902 // FIXME: This isn't really what 'as' does; I think it just uses the implicit
903 // alignment on the section (e.g., if one manually inserts bytes into the
904 // section, then just issueing the section switch directive will not realign
905 // the section. However, this is arguably more reasonable behavior, and there
906 // is no good reason for someone to intentionally emit incorrectly sized
907 // values into the implicitly aligned sections.
909 Out.EmitValueToAlignment(Align, 0, 1, 0);
914 bool AsmParser::ParseEscapedString(std::string &Data) {
915 assert(Lexer.is(AsmToken::String) && "Unexpected current token!");
918 StringRef Str = getTok().getStringContents();
919 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
920 if (Str[i] != '\\') {
925 // Recognize escaped characters. Note that this escape semantics currently
926 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
929 return TokError("unexpected backslash at end of string");
931 // Recognize octal sequences.
932 if ((unsigned) (Str[i] - '0') <= 7) {
933 // Consume up to three octal characters.
934 unsigned Value = Str[i] - '0';
936 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
938 Value = Value * 8 + (Str[i] - '0');
940 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
942 Value = Value * 8 + (Str[i] - '0');
947 return TokError("invalid octal escape sequence (out of range)");
949 Data += (unsigned char) Value;
953 // Otherwise recognize individual escapes.
956 // Just reject invalid escape sequences for now.
957 return TokError("invalid escape sequence (unrecognized character)");
959 case 'b': Data += '\b'; break;
960 case 'f': Data += '\f'; break;
961 case 'n': Data += '\n'; break;
962 case 'r': Data += '\r'; break;
963 case 't': Data += '\t'; break;
964 case '"': Data += '"'; break;
965 case '\\': Data += '\\'; break;
972 /// ParseDirectiveAscii:
973 /// ::= ( .ascii | .asciz ) [ "string" ( , "string" )* ]
974 bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
975 if (Lexer.isNot(AsmToken::EndOfStatement)) {
977 if (Lexer.isNot(AsmToken::String))
978 return TokError("expected string in '.ascii' or '.asciz' directive");
981 if (ParseEscapedString(Data))
984 Out.EmitBytes(Data, DEFAULT_ADDRSPACE);
986 Out.EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE);
990 if (Lexer.is(AsmToken::EndOfStatement))
993 if (Lexer.isNot(AsmToken::Comma))
994 return TokError("unexpected token in '.ascii' or '.asciz' directive");
1003 /// ParseDirectiveValue
1004 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
1005 bool AsmParser::ParseDirectiveValue(unsigned Size) {
1006 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1008 const MCExpr *Value;
1009 SMLoc ATTRIBUTE_UNUSED StartLoc = Lexer.getLoc();
1010 if (ParseExpression(Value))
1013 Out.EmitValue(Value, Size, DEFAULT_ADDRSPACE);
1015 if (Lexer.is(AsmToken::EndOfStatement))
1018 // FIXME: Improve diagnostic.
1019 if (Lexer.isNot(AsmToken::Comma))
1020 return TokError("unexpected token in directive");
1029 /// ParseDirectiveSpace
1030 /// ::= .space expression [ , expression ]
1031 bool AsmParser::ParseDirectiveSpace() {
1033 if (ParseAbsoluteExpression(NumBytes))
1036 int64_t FillExpr = 0;
1037 bool HasFillExpr = false;
1038 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1039 if (Lexer.isNot(AsmToken::Comma))
1040 return TokError("unexpected token in '.space' directive");
1043 if (ParseAbsoluteExpression(FillExpr))
1048 if (Lexer.isNot(AsmToken::EndOfStatement))
1049 return TokError("unexpected token in '.space' directive");
1055 return TokError("invalid number of bytes in '.space' directive");
1057 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
1058 Out.EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE);
1063 /// ParseDirectiveFill
1064 /// ::= .fill expression , expression , expression
1065 bool AsmParser::ParseDirectiveFill() {
1067 if (ParseAbsoluteExpression(NumValues))
1070 if (Lexer.isNot(AsmToken::Comma))
1071 return TokError("unexpected token in '.fill' directive");
1075 if (ParseAbsoluteExpression(FillSize))
1078 if (Lexer.isNot(AsmToken::Comma))
1079 return TokError("unexpected token in '.fill' directive");
1083 if (ParseAbsoluteExpression(FillExpr))
1086 if (Lexer.isNot(AsmToken::EndOfStatement))
1087 return TokError("unexpected token in '.fill' directive");
1091 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
1092 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
1094 for (uint64_t i = 0, e = NumValues; i != e; ++i)
1095 Out.EmitValue(MCConstantExpr::Create(FillExpr, getContext()), FillSize,
1101 /// ParseDirectiveOrg
1102 /// ::= .org expression [ , expression ]
1103 bool AsmParser::ParseDirectiveOrg() {
1104 const MCExpr *Offset;
1105 SMLoc StartLoc = Lexer.getLoc();
1106 if (ParseExpression(Offset))
1109 // Parse optional fill expression.
1110 int64_t FillExpr = 0;
1111 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1112 if (Lexer.isNot(AsmToken::Comma))
1113 return TokError("unexpected token in '.org' directive");
1116 if (ParseAbsoluteExpression(FillExpr))
1119 if (Lexer.isNot(AsmToken::EndOfStatement))
1120 return TokError("unexpected token in '.org' directive");
1125 // FIXME: Only limited forms of relocatable expressions are accepted here, it
1126 // has to be relative to the current section.
1127 Out.EmitValueToOffset(Offset, FillExpr);
1132 /// ParseDirectiveAlign
1133 /// ::= {.align, ...} expression [ , expression [ , expression ]]
1134 bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
1135 SMLoc AlignmentLoc = Lexer.getLoc();
1137 if (ParseAbsoluteExpression(Alignment))
1141 bool HasFillExpr = false;
1142 int64_t FillExpr = 0;
1143 int64_t MaxBytesToFill = 0;
1144 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1145 if (Lexer.isNot(AsmToken::Comma))
1146 return TokError("unexpected token in directive");
1149 // The fill expression can be omitted while specifying a maximum number of
1150 // alignment bytes, e.g:
1152 if (Lexer.isNot(AsmToken::Comma)) {
1154 if (ParseAbsoluteExpression(FillExpr))
1158 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1159 if (Lexer.isNot(AsmToken::Comma))
1160 return TokError("unexpected token in directive");
1163 MaxBytesLoc = Lexer.getLoc();
1164 if (ParseAbsoluteExpression(MaxBytesToFill))
1167 if (Lexer.isNot(AsmToken::EndOfStatement))
1168 return TokError("unexpected token in directive");
1175 // FIXME: Sometimes fill with nop.
1179 // Compute alignment in bytes.
1181 // FIXME: Diagnose overflow.
1182 if (Alignment >= 32) {
1183 Error(AlignmentLoc, "invalid alignment value");
1187 Alignment = 1ULL << Alignment;
1190 // Diagnose non-sensical max bytes to align.
1191 if (MaxBytesLoc.isValid()) {
1192 if (MaxBytesToFill < 1) {
1193 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
1194 "many bytes, ignoring maximum bytes expression");
1198 if (MaxBytesToFill >= Alignment) {
1199 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
1205 // FIXME: hard code the parser to use EmitCodeAlignment for text when using
1206 // the TextAlignFillValue.
1207 if(Out.getCurrentSection()->getKind().isText() &&
1208 Lexer.getMAI().getTextAlignFillValue() == FillExpr)
1209 Out.EmitCodeAlignment(Alignment, MaxBytesToFill);
1211 // FIXME: Target specific behavior about how the "extra" bytes are filled.
1212 Out.EmitValueToAlignment(Alignment, FillExpr, ValueSize, MaxBytesToFill);
1217 /// ParseDirectiveSymbolAttribute
1218 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
1219 bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
1220 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1224 if (ParseIdentifier(Name))
1225 return TokError("expected identifier in directive");
1227 MCSymbol *Sym = CreateSymbol(Name);
1229 Out.EmitSymbolAttribute(Sym, Attr);
1231 if (Lexer.is(AsmToken::EndOfStatement))
1234 if (Lexer.isNot(AsmToken::Comma))
1235 return TokError("unexpected token in directive");
1244 /// ParseDirectiveDarwinSymbolDesc
1245 /// ::= .desc identifier , expression
1246 bool AsmParser::ParseDirectiveDarwinSymbolDesc() {
1248 if (ParseIdentifier(Name))
1249 return TokError("expected identifier in directive");
1251 // Handle the identifier as the key symbol.
1252 MCSymbol *Sym = CreateSymbol(Name);
1254 if (Lexer.isNot(AsmToken::Comma))
1255 return TokError("unexpected token in '.desc' directive");
1258 SMLoc DescLoc = Lexer.getLoc();
1260 if (ParseAbsoluteExpression(DescValue))
1263 if (Lexer.isNot(AsmToken::EndOfStatement))
1264 return TokError("unexpected token in '.desc' directive");
1268 // Set the n_desc field of this Symbol to this DescValue
1269 Out.EmitSymbolDesc(Sym, DescValue);
1274 /// ParseDirectiveComm
1275 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
1276 bool AsmParser::ParseDirectiveComm(bool IsLocal) {
1277 SMLoc IDLoc = Lexer.getLoc();
1279 if (ParseIdentifier(Name))
1280 return TokError("expected identifier in directive");
1282 // Handle the identifier as the key symbol.
1283 MCSymbol *Sym = CreateSymbol(Name);
1285 if (Lexer.isNot(AsmToken::Comma))
1286 return TokError("unexpected token in directive");
1290 SMLoc SizeLoc = Lexer.getLoc();
1291 if (ParseAbsoluteExpression(Size))
1294 int64_t Pow2Alignment = 0;
1295 SMLoc Pow2AlignmentLoc;
1296 if (Lexer.is(AsmToken::Comma)) {
1298 Pow2AlignmentLoc = Lexer.getLoc();
1299 if (ParseAbsoluteExpression(Pow2Alignment))
1302 // If this target takes alignments in bytes (not log) validate and convert.
1303 if (Lexer.getMAI().getAlignmentIsInBytes()) {
1304 if (!isPowerOf2_64(Pow2Alignment))
1305 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
1306 Pow2Alignment = Log2_64(Pow2Alignment);
1310 if (Lexer.isNot(AsmToken::EndOfStatement))
1311 return TokError("unexpected token in '.comm' or '.lcomm' directive");
1315 // NOTE: a size of zero for a .comm should create a undefined symbol
1316 // but a size of .lcomm creates a bss symbol of size zero.
1318 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
1319 "be less than zero");
1321 // NOTE: The alignment in the directive is a power of 2 value, the assembler
1322 // may internally end up wanting an alignment in bytes.
1323 // FIXME: Diagnose overflow.
1324 if (Pow2Alignment < 0)
1325 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
1326 "alignment, can't be less than zero");
1328 if (!Sym->isUndefined())
1329 return Error(IDLoc, "invalid symbol redefinition");
1331 // '.lcomm' is equivalent to '.zerofill'.
1332 // Create the Symbol as a common or local common with Size and Pow2Alignment
1334 Out.EmitZerofill(Ctx.getMachOSection("__DATA", "__bss",
1335 MCSectionMachO::S_ZEROFILL, 0,
1336 SectionKind::getBSS()),
1337 Sym, Size, 1 << Pow2Alignment);
1341 Out.EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
1345 /// ParseDirectiveDarwinZerofill
1346 /// ::= .zerofill segname , sectname [, identifier , size_expression [
1347 /// , align_expression ]]
1348 bool AsmParser::ParseDirectiveDarwinZerofill() {
1350 if (ParseIdentifier(Segment))
1351 return TokError("expected segment name after '.zerofill' directive");
1353 if (Lexer.isNot(AsmToken::Comma))
1354 return TokError("unexpected token in directive");
1358 if (ParseIdentifier(Section))
1359 return TokError("expected section name after comma in '.zerofill' "
1362 // If this is the end of the line all that was wanted was to create the
1363 // the section but with no symbol.
1364 if (Lexer.is(AsmToken::EndOfStatement)) {
1365 // Create the zerofill section but no symbol
1366 Out.EmitZerofill(Ctx.getMachOSection(Segment, Section,
1367 MCSectionMachO::S_ZEROFILL, 0,
1368 SectionKind::getBSS()));
1372 if (Lexer.isNot(AsmToken::Comma))
1373 return TokError("unexpected token in directive");
1376 SMLoc IDLoc = Lexer.getLoc();
1378 if (ParseIdentifier(IDStr))
1379 return TokError("expected identifier in directive");
1381 // handle the identifier as the key symbol.
1382 MCSymbol *Sym = CreateSymbol(IDStr);
1384 if (Lexer.isNot(AsmToken::Comma))
1385 return TokError("unexpected token in directive");
1389 SMLoc SizeLoc = Lexer.getLoc();
1390 if (ParseAbsoluteExpression(Size))
1393 int64_t Pow2Alignment = 0;
1394 SMLoc Pow2AlignmentLoc;
1395 if (Lexer.is(AsmToken::Comma)) {
1397 Pow2AlignmentLoc = Lexer.getLoc();
1398 if (ParseAbsoluteExpression(Pow2Alignment))
1402 if (Lexer.isNot(AsmToken::EndOfStatement))
1403 return TokError("unexpected token in '.zerofill' directive");
1408 return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
1411 // NOTE: The alignment in the directive is a power of 2 value, the assembler
1412 // may internally end up wanting an alignment in bytes.
1413 // FIXME: Diagnose overflow.
1414 if (Pow2Alignment < 0)
1415 return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
1416 "can't be less than zero");
1418 if (!Sym->isUndefined())
1419 return Error(IDLoc, "invalid symbol redefinition");
1421 // Create the zerofill Symbol with Size and Pow2Alignment
1423 // FIXME: Arch specific.
1424 Out.EmitZerofill(Ctx.getMachOSection(Segment, Section,
1425 MCSectionMachO::S_ZEROFILL, 0,
1426 SectionKind::getBSS()),
1427 Sym, Size, 1 << Pow2Alignment);
1432 /// ParseDirectiveDarwinTBSS
1433 /// ::= .tbss identifier, size, align
1434 bool AsmParser::ParseDirectiveDarwinTBSS() {
1435 SMLoc IDLoc = Lexer.getLoc();
1437 if (ParseIdentifier(Name))
1438 return TokError("expected identifier in directive");
1440 // Handle the identifier as the key symbol.
1441 MCSymbol *Sym = CreateSymbol(Name);
1443 if (Lexer.isNot(AsmToken::Comma))
1444 return TokError("unexpected token in directive");
1448 SMLoc SizeLoc = Lexer.getLoc();
1449 if (ParseAbsoluteExpression(Size))
1452 int64_t Pow2Alignment = 0;
1453 SMLoc Pow2AlignmentLoc;
1454 if (Lexer.is(AsmToken::Comma)) {
1456 Pow2AlignmentLoc = Lexer.getLoc();
1457 if (ParseAbsoluteExpression(Pow2Alignment))
1461 if (Lexer.isNot(AsmToken::EndOfStatement))
1462 return TokError("unexpected token in '.tbss' directive");
1467 return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
1470 // FIXME: Diagnose overflow.
1471 if (Pow2Alignment < 0)
1472 return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
1475 if (!Sym->isUndefined())
1476 return Error(IDLoc, "invalid symbol redefinition");
1478 Out.EmitTBSSSymbol(Sym, Size, Pow2Alignment ? 1 << Pow2Alignment : 0);
1483 /// ParseDirectiveDarwinSubsectionsViaSymbols
1484 /// ::= .subsections_via_symbols
1485 bool AsmParser::ParseDirectiveDarwinSubsectionsViaSymbols() {
1486 if (Lexer.isNot(AsmToken::EndOfStatement))
1487 return TokError("unexpected token in '.subsections_via_symbols' directive");
1491 Out.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1496 /// ParseDirectiveAbort
1497 /// ::= .abort [ "abort_string" ]
1498 bool AsmParser::ParseDirectiveAbort() {
1499 // FIXME: Use loc from directive.
1500 SMLoc Loc = Lexer.getLoc();
1503 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1504 if (Lexer.isNot(AsmToken::String))
1505 return TokError("expected string in '.abort' directive");
1507 Str = getTok().getString();
1512 if (Lexer.isNot(AsmToken::EndOfStatement))
1513 return TokError("unexpected token in '.abort' directive");
1517 // FIXME: Handle here.
1519 Error(Loc, ".abort detected. Assembly stopping.");
1521 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
1526 /// ParseDirectiveLsym
1527 /// ::= .lsym identifier , expression
1528 bool AsmParser::ParseDirectiveDarwinLsym() {
1530 if (ParseIdentifier(Name))
1531 return TokError("expected identifier in directive");
1533 // Handle the identifier as the key symbol.
1534 MCSymbol *Sym = CreateSymbol(Name);
1536 if (Lexer.isNot(AsmToken::Comma))
1537 return TokError("unexpected token in '.lsym' directive");
1540 const MCExpr *Value;
1541 SMLoc StartLoc = Lexer.getLoc();
1542 if (ParseExpression(Value))
1545 if (Lexer.isNot(AsmToken::EndOfStatement))
1546 return TokError("unexpected token in '.lsym' directive");
1550 // We don't currently support this directive.
1552 // FIXME: Diagnostic location!
1554 return TokError("directive '.lsym' is unsupported");
1557 /// ParseDirectiveInclude
1558 /// ::= .include "filename"
1559 bool AsmParser::ParseDirectiveInclude() {
1560 if (Lexer.isNot(AsmToken::String))
1561 return TokError("expected string in '.include' directive");
1563 std::string Filename = getTok().getString();
1564 SMLoc IncludeLoc = Lexer.getLoc();
1567 if (Lexer.isNot(AsmToken::EndOfStatement))
1568 return TokError("unexpected token in '.include' directive");
1570 // Strip the quotes.
1571 Filename = Filename.substr(1, Filename.size()-2);
1573 // Attempt to switch the lexer to the included file before consuming the end
1574 // of statement to avoid losing it when we switch.
1575 if (EnterIncludeFile(Filename)) {
1576 PrintMessage(IncludeLoc,
1577 "Could not find include file '" + Filename + "'",
1585 /// ParseDirectiveDarwinDumpOrLoad
1586 /// ::= ( .dump | .load ) "filename"
1587 bool AsmParser::ParseDirectiveDarwinDumpOrLoad(SMLoc IDLoc, bool IsDump) {
1588 if (Lexer.isNot(AsmToken::String))
1589 return TokError("expected string in '.dump' or '.load' directive");
1593 if (Lexer.isNot(AsmToken::EndOfStatement))
1594 return TokError("unexpected token in '.dump' or '.load' directive");
1598 // FIXME: If/when .dump and .load are implemented they will be done in the
1599 // the assembly parser and not have any need for an MCStreamer API.
1601 Warning(IDLoc, "ignoring directive .dump for now");
1603 Warning(IDLoc, "ignoring directive .load for now");
1608 /// ParseDirectiveIf
1609 /// ::= .if expression
1610 bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
1611 TheCondStack.push_back(TheCondState);
1612 TheCondState.TheCond = AsmCond::IfCond;
1613 if(TheCondState.Ignore) {
1614 EatToEndOfStatement();
1618 if (ParseAbsoluteExpression(ExprValue))
1621 if (Lexer.isNot(AsmToken::EndOfStatement))
1622 return TokError("unexpected token in '.if' directive");
1626 TheCondState.CondMet = ExprValue;
1627 TheCondState.Ignore = !TheCondState.CondMet;
1633 /// ParseDirectiveElseIf
1634 /// ::= .elseif expression
1635 bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {
1636 if (TheCondState.TheCond != AsmCond::IfCond &&
1637 TheCondState.TheCond != AsmCond::ElseIfCond)
1638 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
1640 TheCondState.TheCond = AsmCond::ElseIfCond;
1642 bool LastIgnoreState = false;
1643 if (!TheCondStack.empty())
1644 LastIgnoreState = TheCondStack.back().Ignore;
1645 if (LastIgnoreState || TheCondState.CondMet) {
1646 TheCondState.Ignore = true;
1647 EatToEndOfStatement();
1651 if (ParseAbsoluteExpression(ExprValue))
1654 if (Lexer.isNot(AsmToken::EndOfStatement))
1655 return TokError("unexpected token in '.elseif' directive");
1658 TheCondState.CondMet = ExprValue;
1659 TheCondState.Ignore = !TheCondState.CondMet;
1665 /// ParseDirectiveElse
1667 bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
1668 if (Lexer.isNot(AsmToken::EndOfStatement))
1669 return TokError("unexpected token in '.else' directive");
1673 if (TheCondState.TheCond != AsmCond::IfCond &&
1674 TheCondState.TheCond != AsmCond::ElseIfCond)
1675 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
1677 TheCondState.TheCond = AsmCond::ElseCond;
1678 bool LastIgnoreState = false;
1679 if (!TheCondStack.empty())
1680 LastIgnoreState = TheCondStack.back().Ignore;
1681 if (LastIgnoreState || TheCondState.CondMet)
1682 TheCondState.Ignore = true;
1684 TheCondState.Ignore = false;
1689 /// ParseDirectiveEndIf
1691 bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
1692 if (Lexer.isNot(AsmToken::EndOfStatement))
1693 return TokError("unexpected token in '.endif' directive");
1697 if ((TheCondState.TheCond == AsmCond::NoCond) ||
1698 TheCondStack.empty())
1699 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
1701 if (!TheCondStack.empty()) {
1702 TheCondState = TheCondStack.back();
1703 TheCondStack.pop_back();
1709 /// ParseDirectiveFile
1710 /// ::= .file [number] string
1711 bool AsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
1712 // FIXME: I'm not sure what this is.
1713 int64_t FileNumber = -1;
1714 if (Lexer.is(AsmToken::Integer)) {
1715 FileNumber = getTok().getIntVal();
1719 return TokError("file number less than one");
1722 if (Lexer.isNot(AsmToken::String))
1723 return TokError("unexpected token in '.file' directive");
1725 StringRef Filename = getTok().getString();
1726 Filename = Filename.substr(1, Filename.size()-2);
1729 if (Lexer.isNot(AsmToken::EndOfStatement))
1730 return TokError("unexpected token in '.file' directive");
1732 if (FileNumber == -1)
1733 Out.EmitFileDirective(Filename);
1735 Out.EmitDwarfFileDirective(FileNumber, Filename);
1740 /// ParseDirectiveLine
1741 /// ::= .line [number]
1742 bool AsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) {
1743 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1744 if (Lexer.isNot(AsmToken::Integer))
1745 return TokError("unexpected token in '.line' directive");
1747 int64_t LineNumber = getTok().getIntVal();
1751 // FIXME: Do something with the .line.
1754 if (Lexer.isNot(AsmToken::EndOfStatement))
1755 return TokError("unexpected token in '.file' directive");
1761 /// ParseDirectiveLoc
1762 /// ::= .loc number [number [number]]
1763 bool AsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) {
1764 if (Lexer.isNot(AsmToken::Integer))
1765 return TokError("unexpected token in '.loc' directive");
1767 // FIXME: What are these fields?
1768 int64_t FileNumber = getTok().getIntVal();
1770 // FIXME: Validate file.
1773 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1774 if (Lexer.isNot(AsmToken::Integer))
1775 return TokError("unexpected token in '.loc' directive");
1777 int64_t Param2 = getTok().getIntVal();
1781 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1782 if (Lexer.isNot(AsmToken::Integer))
1783 return TokError("unexpected token in '.loc' directive");
1785 int64_t Param3 = getTok().getIntVal();
1789 // FIXME: Do something with the .loc.
1793 if (Lexer.isNot(AsmToken::EndOfStatement))
1794 return TokError("unexpected token in '.file' directive");