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 // Mark the symbol as used in an expression.
193 Sym->setUsedInExpr(true);
195 // Lookup the symbol variant if used.
196 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
197 if (Split.first.size() != getTok().getIdentifier().size())
198 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
200 EndLoc = Lexer.getLoc();
201 Lex(); // Eat identifier.
203 // If this is an absolute variable reference, substitute it now to preserve
204 // semantics in the face of reassignment.
205 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
207 return Error(EndLoc, "unexpected modified on variable reference");
209 Res = Sym->getVariableValue();
213 // Otherwise create a symbol ref.
214 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
217 case AsmToken::Integer: {
218 SMLoc Loc = getTok().getLoc();
219 int64_t IntVal = getTok().getIntVal();
220 Res = MCConstantExpr::Create(IntVal, getContext());
221 EndLoc = Lexer.getLoc();
223 // Look for 'b' or 'f' following an Integer as a directional label
224 if (Lexer.getKind() == AsmToken::Identifier) {
225 StringRef IDVal = getTok().getString();
226 if (IDVal == "f" || IDVal == "b"){
227 MCSymbol *Sym = Ctx.GetDirectionalLocalSymbol(IntVal,
228 IDVal == "f" ? 1 : 0);
229 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None,
231 if(IDVal == "b" && Sym->isUndefined())
232 return Error(Loc, "invalid reference to undefined symbol");
233 EndLoc = Lexer.getLoc();
234 Lex(); // Eat identifier.
239 case AsmToken::Dot: {
240 // This is a '.' reference, which references the current PC. Emit a
241 // temporary label to the streamer and refer to it.
242 MCSymbol *Sym = Ctx.CreateTempSymbol();
244 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
245 EndLoc = Lexer.getLoc();
246 Lex(); // Eat identifier.
250 case AsmToken::LParen:
251 Lex(); // Eat the '('.
252 return ParseParenExpr(Res, EndLoc);
253 case AsmToken::Minus:
254 Lex(); // Eat the operator.
255 if (ParsePrimaryExpr(Res, EndLoc))
257 Res = MCUnaryExpr::CreateMinus(Res, getContext());
260 Lex(); // Eat the operator.
261 if (ParsePrimaryExpr(Res, EndLoc))
263 Res = MCUnaryExpr::CreatePlus(Res, getContext());
265 case AsmToken::Tilde:
266 Lex(); // Eat the operator.
267 if (ParsePrimaryExpr(Res, EndLoc))
269 Res = MCUnaryExpr::CreateNot(Res, getContext());
274 bool AsmParser::ParseExpression(const MCExpr *&Res) {
276 return ParseExpression(Res, EndLoc);
279 /// ParseExpression - Parse an expression and return it.
281 /// expr ::= expr +,- expr -> lowest.
282 /// expr ::= expr |,^,&,! expr -> middle.
283 /// expr ::= expr *,/,%,<<,>> expr -> highest.
284 /// expr ::= primaryexpr
286 bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
287 // Parse the expression.
289 if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
292 // Try to constant fold it up front, if possible.
294 if (Res->EvaluateAsAbsolute(Value))
295 Res = MCConstantExpr::Create(Value, getContext());
300 bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
302 return ParseParenExpr(Res, EndLoc) ||
303 ParseBinOpRHS(1, Res, EndLoc);
306 bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
309 SMLoc StartLoc = Lexer.getLoc();
310 if (ParseExpression(Expr))
313 if (!Expr->EvaluateAsAbsolute(Res))
314 return Error(StartLoc, "expected absolute expression");
319 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
320 MCBinaryExpr::Opcode &Kind) {
323 return 0; // not a binop.
325 // Lowest Precedence: &&, ||
326 case AsmToken::AmpAmp:
327 Kind = MCBinaryExpr::LAnd;
329 case AsmToken::PipePipe:
330 Kind = MCBinaryExpr::LOr;
333 // Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
335 Kind = MCBinaryExpr::Add;
337 case AsmToken::Minus:
338 Kind = MCBinaryExpr::Sub;
340 case AsmToken::EqualEqual:
341 Kind = MCBinaryExpr::EQ;
343 case AsmToken::ExclaimEqual:
344 case AsmToken::LessGreater:
345 Kind = MCBinaryExpr::NE;
348 Kind = MCBinaryExpr::LT;
350 case AsmToken::LessEqual:
351 Kind = MCBinaryExpr::LTE;
353 case AsmToken::Greater:
354 Kind = MCBinaryExpr::GT;
356 case AsmToken::GreaterEqual:
357 Kind = MCBinaryExpr::GTE;
360 // Intermediate Precedence: |, &, ^
362 // FIXME: gas seems to support '!' as an infix operator?
364 Kind = MCBinaryExpr::Or;
366 case AsmToken::Caret:
367 Kind = MCBinaryExpr::Xor;
370 Kind = MCBinaryExpr::And;
373 // Highest Precedence: *, /, %, <<, >>
375 Kind = MCBinaryExpr::Mul;
377 case AsmToken::Slash:
378 Kind = MCBinaryExpr::Div;
380 case AsmToken::Percent:
381 Kind = MCBinaryExpr::Mod;
383 case AsmToken::LessLess:
384 Kind = MCBinaryExpr::Shl;
386 case AsmToken::GreaterGreater:
387 Kind = MCBinaryExpr::Shr;
393 /// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
394 /// Res contains the LHS of the expression on input.
395 bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
398 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
399 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
401 // If the next token is lower precedence than we are allowed to eat, return
402 // successfully with what we ate already.
403 if (TokPrec < Precedence)
408 // Eat the next primary expression.
410 if (ParsePrimaryExpr(RHS, EndLoc)) return true;
412 // If BinOp binds less tightly with RHS than the operator after RHS, let
413 // the pending operator take RHS as its LHS.
414 MCBinaryExpr::Opcode Dummy;
415 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
416 if (TokPrec < NextTokPrec) {
417 if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true;
420 // Merge LHS and RHS according to operator.
421 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
429 /// ::= EndOfStatement
430 /// ::= Label* Directive ...Operands... EndOfStatement
431 /// ::= Label* Identifier OperandList* EndOfStatement
432 bool AsmParser::ParseStatement() {
433 if (Lexer.is(AsmToken::EndOfStatement)) {
438 // Statements always start with an identifier.
439 AsmToken ID = getTok();
440 SMLoc IDLoc = ID.getLoc();
442 int64_t LocalLabelVal = -1;
443 // GUESS allow an integer followed by a ':' as a directional local label
444 if (Lexer.is(AsmToken::Integer)) {
445 LocalLabelVal = getTok().getIntVal();
446 if (LocalLabelVal < 0) {
447 if (!TheCondState.Ignore)
448 return TokError("unexpected token at start of statement");
452 IDVal = getTok().getString();
453 Lex(); // Consume the integer token to be used as an identifier token.
454 if (Lexer.getKind() != AsmToken::Colon) {
455 if (!TheCondState.Ignore)
456 return TokError("unexpected token at start of statement");
460 else if (ParseIdentifier(IDVal)) {
461 if (!TheCondState.Ignore)
462 return TokError("unexpected token at start of statement");
466 // Handle conditional assembly here before checking for skipping. We
467 // have to do this so that .endif isn't skipped in a ".if 0" block for
470 return ParseDirectiveIf(IDLoc);
471 if (IDVal == ".elseif")
472 return ParseDirectiveElseIf(IDLoc);
473 if (IDVal == ".else")
474 return ParseDirectiveElse(IDLoc);
475 if (IDVal == ".endif")
476 return ParseDirectiveEndIf(IDLoc);
478 // If we are in a ".if 0" block, ignore this statement.
479 if (TheCondState.Ignore) {
480 EatToEndOfStatement();
484 // FIXME: Recurse on local labels?
486 // See what kind of statement we have.
487 switch (Lexer.getKind()) {
488 case AsmToken::Colon: {
489 // identifier ':' -> Label.
492 // Diagnose attempt to use a variable as a label.
494 // FIXME: Diagnostics. Note the location of the definition as a label.
495 // FIXME: This doesn't diagnose assignment to a symbol which has been
496 // implicitly marked as external.
498 if (LocalLabelVal == -1)
499 Sym = CreateSymbol(IDVal);
501 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
502 if (!Sym->isUndefined() || Sym->isVariable())
503 return Error(IDLoc, "invalid symbol redefinition");
508 return ParseStatement();
511 case AsmToken::Equal:
512 // identifier '=' ... -> assignment statement
515 return ParseAssignment(IDVal);
517 default: // Normal instruction or directive.
521 // Otherwise, we have a normal instruction or directive.
522 if (IDVal[0] == '.') {
523 // FIXME: This should be driven based on a hash lookup and callback.
524 if (IDVal == ".section")
525 return ParseDirectiveDarwinSection();
526 if (IDVal == ".text")
527 // FIXME: This changes behavior based on the -static flag to the
529 return ParseDirectiveSectionSwitch("__TEXT", "__text",
530 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
531 if (IDVal == ".const")
532 return ParseDirectiveSectionSwitch("__TEXT", "__const");
533 if (IDVal == ".static_const")
534 return ParseDirectiveSectionSwitch("__TEXT", "__static_const");
535 if (IDVal == ".cstring")
536 return ParseDirectiveSectionSwitch("__TEXT","__cstring",
537 MCSectionMachO::S_CSTRING_LITERALS);
538 if (IDVal == ".literal4")
539 return ParseDirectiveSectionSwitch("__TEXT", "__literal4",
540 MCSectionMachO::S_4BYTE_LITERALS,
542 if (IDVal == ".literal8")
543 return ParseDirectiveSectionSwitch("__TEXT", "__literal8",
544 MCSectionMachO::S_8BYTE_LITERALS,
546 if (IDVal == ".literal16")
547 return ParseDirectiveSectionSwitch("__TEXT","__literal16",
548 MCSectionMachO::S_16BYTE_LITERALS,
550 if (IDVal == ".constructor")
551 return ParseDirectiveSectionSwitch("__TEXT","__constructor");
552 if (IDVal == ".destructor")
553 return ParseDirectiveSectionSwitch("__TEXT","__destructor");
554 if (IDVal == ".fvmlib_init0")
555 return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init0");
556 if (IDVal == ".fvmlib_init1")
557 return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init1");
559 // FIXME: The assembler manual claims that this has the self modify code
560 // flag, at least on x86-32, but that does not appear to be correct.
561 if (IDVal == ".symbol_stub")
562 return ParseDirectiveSectionSwitch("__TEXT","__symbol_stub",
563 MCSectionMachO::S_SYMBOL_STUBS |
564 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
565 // FIXME: Different on PPC and ARM.
567 // FIXME: PowerPC only?
568 if (IDVal == ".picsymbol_stub")
569 return ParseDirectiveSectionSwitch("__TEXT","__picsymbol_stub",
570 MCSectionMachO::S_SYMBOL_STUBS |
571 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
573 if (IDVal == ".data")
574 return ParseDirectiveSectionSwitch("__DATA", "__data");
575 if (IDVal == ".static_data")
576 return ParseDirectiveSectionSwitch("__DATA", "__static_data");
578 // FIXME: The section names of these two are misspelled in the assembler
580 if (IDVal == ".non_lazy_symbol_pointer")
581 return ParseDirectiveSectionSwitch("__DATA", "__nl_symbol_ptr",
582 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
584 if (IDVal == ".lazy_symbol_pointer")
585 return ParseDirectiveSectionSwitch("__DATA", "__la_symbol_ptr",
586 MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
589 if (IDVal == ".dyld")
590 return ParseDirectiveSectionSwitch("__DATA", "__dyld");
591 if (IDVal == ".mod_init_func")
592 return ParseDirectiveSectionSwitch("__DATA", "__mod_init_func",
593 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
595 if (IDVal == ".mod_term_func")
596 return ParseDirectiveSectionSwitch("__DATA", "__mod_term_func",
597 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
599 if (IDVal == ".const_data")
600 return ParseDirectiveSectionSwitch("__DATA", "__const");
603 if (IDVal == ".objc_class")
604 return ParseDirectiveSectionSwitch("__OBJC", "__class",
605 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
606 if (IDVal == ".objc_meta_class")
607 return ParseDirectiveSectionSwitch("__OBJC", "__meta_class",
608 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
609 if (IDVal == ".objc_cat_cls_meth")
610 return ParseDirectiveSectionSwitch("__OBJC", "__cat_cls_meth",
611 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
612 if (IDVal == ".objc_cat_inst_meth")
613 return ParseDirectiveSectionSwitch("__OBJC", "__cat_inst_meth",
614 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
615 if (IDVal == ".objc_protocol")
616 return ParseDirectiveSectionSwitch("__OBJC", "__protocol",
617 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
618 if (IDVal == ".objc_string_object")
619 return ParseDirectiveSectionSwitch("__OBJC", "__string_object",
620 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
621 if (IDVal == ".objc_cls_meth")
622 return ParseDirectiveSectionSwitch("__OBJC", "__cls_meth",
623 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
624 if (IDVal == ".objc_inst_meth")
625 return ParseDirectiveSectionSwitch("__OBJC", "__inst_meth",
626 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
627 if (IDVal == ".objc_cls_refs")
628 return ParseDirectiveSectionSwitch("__OBJC", "__cls_refs",
629 MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
630 MCSectionMachO::S_LITERAL_POINTERS,
632 if (IDVal == ".objc_message_refs")
633 return ParseDirectiveSectionSwitch("__OBJC", "__message_refs",
634 MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
635 MCSectionMachO::S_LITERAL_POINTERS,
637 if (IDVal == ".objc_symbols")
638 return ParseDirectiveSectionSwitch("__OBJC", "__symbols",
639 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
640 if (IDVal == ".objc_category")
641 return ParseDirectiveSectionSwitch("__OBJC", "__category",
642 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
643 if (IDVal == ".objc_class_vars")
644 return ParseDirectiveSectionSwitch("__OBJC", "__class_vars",
645 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
646 if (IDVal == ".objc_instance_vars")
647 return ParseDirectiveSectionSwitch("__OBJC", "__instance_vars",
648 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
649 if (IDVal == ".objc_module_info")
650 return ParseDirectiveSectionSwitch("__OBJC", "__module_info",
651 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
652 if (IDVal == ".objc_class_names")
653 return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
654 MCSectionMachO::S_CSTRING_LITERALS);
655 if (IDVal == ".objc_meth_var_types")
656 return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
657 MCSectionMachO::S_CSTRING_LITERALS);
658 if (IDVal == ".objc_meth_var_names")
659 return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
660 MCSectionMachO::S_CSTRING_LITERALS);
661 if (IDVal == ".objc_selector_strs")
662 return ParseDirectiveSectionSwitch("__OBJC", "__selector_strs",
663 MCSectionMachO::S_CSTRING_LITERALS);
665 if (IDVal == ".tdata")
666 return ParseDirectiveSectionSwitch("__DATA", "__thread_data",
667 MCSectionMachO::S_THREAD_LOCAL_REGULAR);
669 return ParseDirectiveSectionSwitch("__DATA", "__thread_vars",
670 MCSectionMachO::S_THREAD_LOCAL_VARIABLES);
671 if (IDVal == ".thread_init_func")
672 return ParseDirectiveSectionSwitch("__DATA", "__thread_init",
673 MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
675 // Assembler features
677 return ParseDirectiveSet();
681 if (IDVal == ".ascii")
682 return ParseDirectiveAscii(false);
683 if (IDVal == ".asciz")
684 return ParseDirectiveAscii(true);
686 if (IDVal == ".byte")
687 return ParseDirectiveValue(1);
688 if (IDVal == ".short")
689 return ParseDirectiveValue(2);
690 if (IDVal == ".long")
691 return ParseDirectiveValue(4);
692 if (IDVal == ".quad")
693 return ParseDirectiveValue(8);
695 // FIXME: Target hooks for IsPow2.
696 if (IDVal == ".align")
697 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
698 if (IDVal == ".align32")
699 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
700 if (IDVal == ".balign")
701 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
702 if (IDVal == ".balignw")
703 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
704 if (IDVal == ".balignl")
705 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
706 if (IDVal == ".p2align")
707 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
708 if (IDVal == ".p2alignw")
709 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
710 if (IDVal == ".p2alignl")
711 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
714 return ParseDirectiveOrg();
716 if (IDVal == ".fill")
717 return ParseDirectiveFill();
718 if (IDVal == ".space")
719 return ParseDirectiveSpace();
721 // Symbol attribute directives
723 if (IDVal == ".globl" || IDVal == ".global")
724 return ParseDirectiveSymbolAttribute(MCSA_Global);
725 if (IDVal == ".hidden")
726 return ParseDirectiveSymbolAttribute(MCSA_Hidden);
727 if (IDVal == ".indirect_symbol")
728 return ParseDirectiveSymbolAttribute(MCSA_IndirectSymbol);
729 if (IDVal == ".internal")
730 return ParseDirectiveSymbolAttribute(MCSA_Internal);
731 if (IDVal == ".lazy_reference")
732 return ParseDirectiveSymbolAttribute(MCSA_LazyReference);
733 if (IDVal == ".no_dead_strip")
734 return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
735 if (IDVal == ".private_extern")
736 return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern);
737 if (IDVal == ".protected")
738 return ParseDirectiveSymbolAttribute(MCSA_Protected);
739 if (IDVal == ".reference")
740 return ParseDirectiveSymbolAttribute(MCSA_Reference);
741 if (IDVal == ".weak")
742 return ParseDirectiveSymbolAttribute(MCSA_Weak);
743 if (IDVal == ".weak_definition")
744 return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition);
745 if (IDVal == ".weak_reference")
746 return ParseDirectiveSymbolAttribute(MCSA_WeakReference);
748 if (IDVal == ".comm")
749 return ParseDirectiveComm(/*IsLocal=*/false);
750 if (IDVal == ".lcomm")
751 return ParseDirectiveComm(/*IsLocal=*/true);
752 if (IDVal == ".zerofill")
753 return ParseDirectiveDarwinZerofill();
754 if (IDVal == ".desc")
755 return ParseDirectiveDarwinSymbolDesc();
756 if (IDVal == ".lsym")
757 return ParseDirectiveDarwinLsym();
758 if (IDVal == ".tbss")
759 return ParseDirectiveDarwinTBSS();
761 if (IDVal == ".subsections_via_symbols")
762 return ParseDirectiveDarwinSubsectionsViaSymbols();
763 if (IDVal == ".abort")
764 return ParseDirectiveAbort();
765 if (IDVal == ".include")
766 return ParseDirectiveInclude();
767 if (IDVal == ".dump")
768 return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsDump=*/true);
769 if (IDVal == ".load")
770 return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsLoad=*/false);
772 // Look up the handler in the handler table,
773 bool(AsmParser::*Handler)(StringRef, SMLoc) = DirectiveMap[IDVal];
775 return (this->*Handler)(IDVal, IDLoc);
777 // Target hook for parsing target specific directives.
778 if (!getTargetParser().ParseDirective(ID))
781 Warning(IDLoc, "ignoring directive for now");
782 EatToEndOfStatement();
786 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
787 bool HadError = getTargetParser().ParseInstruction(IDVal, IDLoc,
789 if (!HadError && Lexer.isNot(AsmToken::EndOfStatement))
790 HadError = TokError("unexpected token in argument list");
792 // If parsing succeeded, match the instruction.
795 if (!getTargetParser().MatchInstruction(ParsedOperands, Inst)) {
796 // Emit the instruction on success.
797 Out.EmitInstruction(Inst);
799 // Otherwise emit a diagnostic about the match failure and set the error
802 // FIXME: We should give nicer diagnostics about the exact failure.
803 Error(IDLoc, "unrecognized instruction");
808 // If there was no error, consume the end-of-statement token. Otherwise this
809 // will be done by our caller.
813 // Free any parsed operands.
814 for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
815 delete ParsedOperands[i];
820 bool AsmParser::ParseAssignment(const StringRef &Name) {
821 // FIXME: Use better location, we should use proper tokens.
822 SMLoc EqualLoc = Lexer.getLoc();
825 SMLoc StartLoc = Lexer.getLoc();
826 if (ParseExpression(Value))
829 if (Lexer.isNot(AsmToken::EndOfStatement))
830 return TokError("unexpected token in assignment");
832 // Eat the end of statement marker.
835 // Validate that the LHS is allowed to be a variable (either it has not been
836 // used as a symbol, or it is an absolute symbol).
837 MCSymbol *Sym = getContext().LookupSymbol(Name);
839 // Diagnose assignment to a label.
841 // FIXME: Diagnostics. Note the location of the definition as a label.
842 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
843 if (Sym->isUndefined() && !Sym->isUsedInExpr())
844 ; // Allow redefinitions of undefined symbols only used in directives.
845 else if (!Sym->isUndefined() && !Sym->isAbsolute())
846 return Error(EqualLoc, "redefinition of '" + Name + "'");
847 else if (!Sym->isVariable())
848 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
849 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
850 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
853 Sym = CreateSymbol(Name);
855 // FIXME: Handle '.'.
857 Sym->setUsedInExpr(true);
859 // Do the assignment.
860 Out.EmitAssignment(Sym, Value);
868 bool AsmParser::ParseIdentifier(StringRef &Res) {
869 if (Lexer.isNot(AsmToken::Identifier) &&
870 Lexer.isNot(AsmToken::String))
873 Res = getTok().getIdentifier();
875 Lex(); // Consume the identifier token.
880 /// ParseDirectiveSet:
881 /// ::= .set identifier ',' expression
882 bool AsmParser::ParseDirectiveSet() {
885 if (ParseIdentifier(Name))
886 return TokError("expected identifier after '.set' directive");
888 if (Lexer.isNot(AsmToken::Comma))
889 return TokError("unexpected token in '.set'");
892 return ParseAssignment(Name);
895 /// ParseDirectiveSection:
896 /// ::= .section identifier (',' identifier)*
897 /// FIXME: This should actually parse out the segment, section, attributes and
898 /// sizeof_stub fields.
899 bool AsmParser::ParseDirectiveDarwinSection() {
900 SMLoc Loc = Lexer.getLoc();
902 StringRef SectionName;
903 if (ParseIdentifier(SectionName))
904 return Error(Loc, "expected identifier after '.section' directive");
906 // Verify there is a following comma.
907 if (!Lexer.is(AsmToken::Comma))
908 return TokError("unexpected token in '.section' directive");
910 std::string SectionSpec = SectionName;
913 // Add all the tokens until the end of the line, ParseSectionSpecifier will
915 StringRef EOL = Lexer.LexUntilEndOfStatement();
916 SectionSpec.append(EOL.begin(), EOL.end());
919 if (Lexer.isNot(AsmToken::EndOfStatement))
920 return TokError("unexpected token in '.section' directive");
924 StringRef Segment, Section;
925 unsigned TAA, StubSize;
926 std::string ErrorStr =
927 MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
930 if (!ErrorStr.empty())
931 return Error(Loc, ErrorStr.c_str());
933 // FIXME: Arch specific.
934 bool isText = Segment == "__TEXT"; // FIXME: Hack.
935 Out.SwitchSection(Ctx.getMachOSection(Segment, Section, TAA, StubSize,
936 isText ? SectionKind::getText()
937 : SectionKind::getDataRel()));
941 /// ParseDirectiveSectionSwitch -
942 bool AsmParser::ParseDirectiveSectionSwitch(const char *Segment,
944 unsigned TAA, unsigned Align,
946 if (Lexer.isNot(AsmToken::EndOfStatement))
947 return TokError("unexpected token in section switching directive");
950 // FIXME: Arch specific.
951 bool isText = StringRef(Segment) == "__TEXT"; // FIXME: Hack.
952 Out.SwitchSection(Ctx.getMachOSection(Segment, Section, TAA, StubSize,
953 isText ? SectionKind::getText()
954 : SectionKind::getDataRel()));
956 // Set the implicit alignment, if any.
958 // FIXME: This isn't really what 'as' does; I think it just uses the implicit
959 // alignment on the section (e.g., if one manually inserts bytes into the
960 // section, then just issueing the section switch directive will not realign
961 // the section. However, this is arguably more reasonable behavior, and there
962 // is no good reason for someone to intentionally emit incorrectly sized
963 // values into the implicitly aligned sections.
965 Out.EmitValueToAlignment(Align, 0, 1, 0);
970 bool AsmParser::ParseEscapedString(std::string &Data) {
971 assert(Lexer.is(AsmToken::String) && "Unexpected current token!");
974 StringRef Str = getTok().getStringContents();
975 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
976 if (Str[i] != '\\') {
981 // Recognize escaped characters. Note that this escape semantics currently
982 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
985 return TokError("unexpected backslash at end of string");
987 // Recognize octal sequences.
988 if ((unsigned) (Str[i] - '0') <= 7) {
989 // Consume up to three octal characters.
990 unsigned Value = Str[i] - '0';
992 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
994 Value = Value * 8 + (Str[i] - '0');
996 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
998 Value = Value * 8 + (Str[i] - '0');
1003 return TokError("invalid octal escape sequence (out of range)");
1005 Data += (unsigned char) Value;
1009 // Otherwise recognize individual escapes.
1012 // Just reject invalid escape sequences for now.
1013 return TokError("invalid escape sequence (unrecognized character)");
1015 case 'b': Data += '\b'; break;
1016 case 'f': Data += '\f'; break;
1017 case 'n': Data += '\n'; break;
1018 case 'r': Data += '\r'; break;
1019 case 't': Data += '\t'; break;
1020 case '"': Data += '"'; break;
1021 case '\\': Data += '\\'; break;
1028 /// ParseDirectiveAscii:
1029 /// ::= ( .ascii | .asciz ) [ "string" ( , "string" )* ]
1030 bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
1031 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1033 if (Lexer.isNot(AsmToken::String))
1034 return TokError("expected string in '.ascii' or '.asciz' directive");
1037 if (ParseEscapedString(Data))
1040 Out.EmitBytes(Data, DEFAULT_ADDRSPACE);
1042 Out.EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE);
1046 if (Lexer.is(AsmToken::EndOfStatement))
1049 if (Lexer.isNot(AsmToken::Comma))
1050 return TokError("unexpected token in '.ascii' or '.asciz' directive");
1059 /// ParseDirectiveValue
1060 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
1061 bool AsmParser::ParseDirectiveValue(unsigned Size) {
1062 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1064 const MCExpr *Value;
1065 SMLoc ATTRIBUTE_UNUSED StartLoc = Lexer.getLoc();
1066 if (ParseExpression(Value))
1069 Out.EmitValue(Value, Size, DEFAULT_ADDRSPACE);
1071 if (Lexer.is(AsmToken::EndOfStatement))
1074 // FIXME: Improve diagnostic.
1075 if (Lexer.isNot(AsmToken::Comma))
1076 return TokError("unexpected token in directive");
1085 /// ParseDirectiveSpace
1086 /// ::= .space expression [ , expression ]
1087 bool AsmParser::ParseDirectiveSpace() {
1089 if (ParseAbsoluteExpression(NumBytes))
1092 int64_t FillExpr = 0;
1093 bool HasFillExpr = false;
1094 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1095 if (Lexer.isNot(AsmToken::Comma))
1096 return TokError("unexpected token in '.space' directive");
1099 if (ParseAbsoluteExpression(FillExpr))
1104 if (Lexer.isNot(AsmToken::EndOfStatement))
1105 return TokError("unexpected token in '.space' directive");
1111 return TokError("invalid number of bytes in '.space' directive");
1113 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
1114 Out.EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE);
1119 /// ParseDirectiveFill
1120 /// ::= .fill expression , expression , expression
1121 bool AsmParser::ParseDirectiveFill() {
1123 if (ParseAbsoluteExpression(NumValues))
1126 if (Lexer.isNot(AsmToken::Comma))
1127 return TokError("unexpected token in '.fill' directive");
1131 if (ParseAbsoluteExpression(FillSize))
1134 if (Lexer.isNot(AsmToken::Comma))
1135 return TokError("unexpected token in '.fill' directive");
1139 if (ParseAbsoluteExpression(FillExpr))
1142 if (Lexer.isNot(AsmToken::EndOfStatement))
1143 return TokError("unexpected token in '.fill' directive");
1147 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
1148 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
1150 for (uint64_t i = 0, e = NumValues; i != e; ++i)
1151 Out.EmitValue(MCConstantExpr::Create(FillExpr, getContext()), FillSize,
1157 /// ParseDirectiveOrg
1158 /// ::= .org expression [ , expression ]
1159 bool AsmParser::ParseDirectiveOrg() {
1160 const MCExpr *Offset;
1161 SMLoc StartLoc = Lexer.getLoc();
1162 if (ParseExpression(Offset))
1165 // Parse optional fill expression.
1166 int64_t FillExpr = 0;
1167 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1168 if (Lexer.isNot(AsmToken::Comma))
1169 return TokError("unexpected token in '.org' directive");
1172 if (ParseAbsoluteExpression(FillExpr))
1175 if (Lexer.isNot(AsmToken::EndOfStatement))
1176 return TokError("unexpected token in '.org' directive");
1181 // FIXME: Only limited forms of relocatable expressions are accepted here, it
1182 // has to be relative to the current section.
1183 Out.EmitValueToOffset(Offset, FillExpr);
1188 /// ParseDirectiveAlign
1189 /// ::= {.align, ...} expression [ , expression [ , expression ]]
1190 bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
1191 SMLoc AlignmentLoc = Lexer.getLoc();
1193 if (ParseAbsoluteExpression(Alignment))
1197 bool HasFillExpr = false;
1198 int64_t FillExpr = 0;
1199 int64_t MaxBytesToFill = 0;
1200 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1201 if (Lexer.isNot(AsmToken::Comma))
1202 return TokError("unexpected token in directive");
1205 // The fill expression can be omitted while specifying a maximum number of
1206 // alignment bytes, e.g:
1208 if (Lexer.isNot(AsmToken::Comma)) {
1210 if (ParseAbsoluteExpression(FillExpr))
1214 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1215 if (Lexer.isNot(AsmToken::Comma))
1216 return TokError("unexpected token in directive");
1219 MaxBytesLoc = Lexer.getLoc();
1220 if (ParseAbsoluteExpression(MaxBytesToFill))
1223 if (Lexer.isNot(AsmToken::EndOfStatement))
1224 return TokError("unexpected token in directive");
1233 // Compute alignment in bytes.
1235 // FIXME: Diagnose overflow.
1236 if (Alignment >= 32) {
1237 Error(AlignmentLoc, "invalid alignment value");
1241 Alignment = 1ULL << Alignment;
1244 // Diagnose non-sensical max bytes to align.
1245 if (MaxBytesLoc.isValid()) {
1246 if (MaxBytesToFill < 1) {
1247 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
1248 "many bytes, ignoring maximum bytes expression");
1252 if (MaxBytesToFill >= Alignment) {
1253 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
1259 // Check whether we should use optimal code alignment for this .align
1262 // FIXME: This should be using a target hook.
1263 bool UseCodeAlign = false;
1264 if (const MCSectionMachO *S = dyn_cast<MCSectionMachO>(
1265 Out.getCurrentSection()))
1266 UseCodeAlign = S->hasAttribute(MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
1267 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
1268 ValueSize == 1 && UseCodeAlign) {
1269 Out.EmitCodeAlignment(Alignment, MaxBytesToFill);
1271 // FIXME: Target specific behavior about how the "extra" bytes are filled.
1272 Out.EmitValueToAlignment(Alignment, FillExpr, ValueSize, MaxBytesToFill);
1278 /// ParseDirectiveSymbolAttribute
1279 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
1280 bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
1281 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1285 if (ParseIdentifier(Name))
1286 return TokError("expected identifier in directive");
1288 MCSymbol *Sym = CreateSymbol(Name);
1290 Out.EmitSymbolAttribute(Sym, Attr);
1292 if (Lexer.is(AsmToken::EndOfStatement))
1295 if (Lexer.isNot(AsmToken::Comma))
1296 return TokError("unexpected token in directive");
1305 /// ParseDirectiveDarwinSymbolDesc
1306 /// ::= .desc identifier , expression
1307 bool AsmParser::ParseDirectiveDarwinSymbolDesc() {
1309 if (ParseIdentifier(Name))
1310 return TokError("expected identifier in directive");
1312 // Handle the identifier as the key symbol.
1313 MCSymbol *Sym = CreateSymbol(Name);
1315 if (Lexer.isNot(AsmToken::Comma))
1316 return TokError("unexpected token in '.desc' directive");
1319 SMLoc DescLoc = Lexer.getLoc();
1321 if (ParseAbsoluteExpression(DescValue))
1324 if (Lexer.isNot(AsmToken::EndOfStatement))
1325 return TokError("unexpected token in '.desc' directive");
1329 // Set the n_desc field of this Symbol to this DescValue
1330 Out.EmitSymbolDesc(Sym, DescValue);
1335 /// ParseDirectiveComm
1336 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
1337 bool AsmParser::ParseDirectiveComm(bool IsLocal) {
1338 SMLoc IDLoc = Lexer.getLoc();
1340 if (ParseIdentifier(Name))
1341 return TokError("expected identifier in directive");
1343 // Handle the identifier as the key symbol.
1344 MCSymbol *Sym = CreateSymbol(Name);
1346 if (Lexer.isNot(AsmToken::Comma))
1347 return TokError("unexpected token in directive");
1351 SMLoc SizeLoc = Lexer.getLoc();
1352 if (ParseAbsoluteExpression(Size))
1355 int64_t Pow2Alignment = 0;
1356 SMLoc Pow2AlignmentLoc;
1357 if (Lexer.is(AsmToken::Comma)) {
1359 Pow2AlignmentLoc = Lexer.getLoc();
1360 if (ParseAbsoluteExpression(Pow2Alignment))
1363 // If this target takes alignments in bytes (not log) validate and convert.
1364 if (Lexer.getMAI().getAlignmentIsInBytes()) {
1365 if (!isPowerOf2_64(Pow2Alignment))
1366 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
1367 Pow2Alignment = Log2_64(Pow2Alignment);
1371 if (Lexer.isNot(AsmToken::EndOfStatement))
1372 return TokError("unexpected token in '.comm' or '.lcomm' directive");
1376 // NOTE: a size of zero for a .comm should create a undefined symbol
1377 // but a size of .lcomm creates a bss symbol of size zero.
1379 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
1380 "be less than zero");
1382 // NOTE: The alignment in the directive is a power of 2 value, the assembler
1383 // may internally end up wanting an alignment in bytes.
1384 // FIXME: Diagnose overflow.
1385 if (Pow2Alignment < 0)
1386 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
1387 "alignment, can't be less than zero");
1389 if (!Sym->isUndefined())
1390 return Error(IDLoc, "invalid symbol redefinition");
1392 // '.lcomm' is equivalent to '.zerofill'.
1393 // Create the Symbol as a common or local common with Size and Pow2Alignment
1395 Out.EmitZerofill(Ctx.getMachOSection("__DATA", "__bss",
1396 MCSectionMachO::S_ZEROFILL, 0,
1397 SectionKind::getBSS()),
1398 Sym, Size, 1 << Pow2Alignment);
1402 Out.EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
1406 /// ParseDirectiveDarwinZerofill
1407 /// ::= .zerofill segname , sectname [, identifier , size_expression [
1408 /// , align_expression ]]
1409 bool AsmParser::ParseDirectiveDarwinZerofill() {
1411 if (ParseIdentifier(Segment))
1412 return TokError("expected segment name after '.zerofill' directive");
1414 if (Lexer.isNot(AsmToken::Comma))
1415 return TokError("unexpected token in directive");
1419 if (ParseIdentifier(Section))
1420 return TokError("expected section name after comma in '.zerofill' "
1423 // If this is the end of the line all that was wanted was to create the
1424 // the section but with no symbol.
1425 if (Lexer.is(AsmToken::EndOfStatement)) {
1426 // Create the zerofill section but no symbol
1427 Out.EmitZerofill(Ctx.getMachOSection(Segment, Section,
1428 MCSectionMachO::S_ZEROFILL, 0,
1429 SectionKind::getBSS()));
1433 if (Lexer.isNot(AsmToken::Comma))
1434 return TokError("unexpected token in directive");
1437 SMLoc IDLoc = Lexer.getLoc();
1439 if (ParseIdentifier(IDStr))
1440 return TokError("expected identifier in directive");
1442 // handle the identifier as the key symbol.
1443 MCSymbol *Sym = CreateSymbol(IDStr);
1445 if (Lexer.isNot(AsmToken::Comma))
1446 return TokError("unexpected token in directive");
1450 SMLoc SizeLoc = Lexer.getLoc();
1451 if (ParseAbsoluteExpression(Size))
1454 int64_t Pow2Alignment = 0;
1455 SMLoc Pow2AlignmentLoc;
1456 if (Lexer.is(AsmToken::Comma)) {
1458 Pow2AlignmentLoc = Lexer.getLoc();
1459 if (ParseAbsoluteExpression(Pow2Alignment))
1463 if (Lexer.isNot(AsmToken::EndOfStatement))
1464 return TokError("unexpected token in '.zerofill' directive");
1469 return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
1472 // NOTE: The alignment in the directive is a power of 2 value, the assembler
1473 // may internally end up wanting an alignment in bytes.
1474 // FIXME: Diagnose overflow.
1475 if (Pow2Alignment < 0)
1476 return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
1477 "can't be less than zero");
1479 if (!Sym->isUndefined())
1480 return Error(IDLoc, "invalid symbol redefinition");
1482 // Create the zerofill Symbol with Size and Pow2Alignment
1484 // FIXME: Arch specific.
1485 Out.EmitZerofill(Ctx.getMachOSection(Segment, Section,
1486 MCSectionMachO::S_ZEROFILL, 0,
1487 SectionKind::getBSS()),
1488 Sym, Size, 1 << Pow2Alignment);
1493 /// ParseDirectiveDarwinTBSS
1494 /// ::= .tbss identifier, size, align
1495 bool AsmParser::ParseDirectiveDarwinTBSS() {
1496 SMLoc IDLoc = Lexer.getLoc();
1498 if (ParseIdentifier(Name))
1499 return TokError("expected identifier in directive");
1501 // Handle the identifier as the key symbol.
1502 MCSymbol *Sym = CreateSymbol(Name);
1504 if (Lexer.isNot(AsmToken::Comma))
1505 return TokError("unexpected token in directive");
1509 SMLoc SizeLoc = Lexer.getLoc();
1510 if (ParseAbsoluteExpression(Size))
1513 int64_t Pow2Alignment = 0;
1514 SMLoc Pow2AlignmentLoc;
1515 if (Lexer.is(AsmToken::Comma)) {
1517 Pow2AlignmentLoc = Lexer.getLoc();
1518 if (ParseAbsoluteExpression(Pow2Alignment))
1522 if (Lexer.isNot(AsmToken::EndOfStatement))
1523 return TokError("unexpected token in '.tbss' directive");
1528 return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
1531 // FIXME: Diagnose overflow.
1532 if (Pow2Alignment < 0)
1533 return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
1536 if (!Sym->isUndefined())
1537 return Error(IDLoc, "invalid symbol redefinition");
1539 Out.EmitTBSSSymbol(Sym, Size, Pow2Alignment ? 1 << Pow2Alignment : 0);
1544 /// ParseDirectiveDarwinSubsectionsViaSymbols
1545 /// ::= .subsections_via_symbols
1546 bool AsmParser::ParseDirectiveDarwinSubsectionsViaSymbols() {
1547 if (Lexer.isNot(AsmToken::EndOfStatement))
1548 return TokError("unexpected token in '.subsections_via_symbols' directive");
1552 Out.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1557 /// ParseDirectiveAbort
1558 /// ::= .abort [ "abort_string" ]
1559 bool AsmParser::ParseDirectiveAbort() {
1560 // FIXME: Use loc from directive.
1561 SMLoc Loc = Lexer.getLoc();
1564 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1565 if (Lexer.isNot(AsmToken::String))
1566 return TokError("expected string in '.abort' directive");
1568 Str = getTok().getString();
1573 if (Lexer.isNot(AsmToken::EndOfStatement))
1574 return TokError("unexpected token in '.abort' directive");
1578 // FIXME: Handle here.
1580 Error(Loc, ".abort detected. Assembly stopping.");
1582 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
1587 /// ParseDirectiveLsym
1588 /// ::= .lsym identifier , expression
1589 bool AsmParser::ParseDirectiveDarwinLsym() {
1591 if (ParseIdentifier(Name))
1592 return TokError("expected identifier in directive");
1594 // Handle the identifier as the key symbol.
1595 MCSymbol *Sym = CreateSymbol(Name);
1597 if (Lexer.isNot(AsmToken::Comma))
1598 return TokError("unexpected token in '.lsym' directive");
1601 const MCExpr *Value;
1602 SMLoc StartLoc = Lexer.getLoc();
1603 if (ParseExpression(Value))
1606 if (Lexer.isNot(AsmToken::EndOfStatement))
1607 return TokError("unexpected token in '.lsym' directive");
1611 // We don't currently support this directive.
1613 // FIXME: Diagnostic location!
1615 return TokError("directive '.lsym' is unsupported");
1618 /// ParseDirectiveInclude
1619 /// ::= .include "filename"
1620 bool AsmParser::ParseDirectiveInclude() {
1621 if (Lexer.isNot(AsmToken::String))
1622 return TokError("expected string in '.include' directive");
1624 std::string Filename = getTok().getString();
1625 SMLoc IncludeLoc = Lexer.getLoc();
1628 if (Lexer.isNot(AsmToken::EndOfStatement))
1629 return TokError("unexpected token in '.include' directive");
1631 // Strip the quotes.
1632 Filename = Filename.substr(1, Filename.size()-2);
1634 // Attempt to switch the lexer to the included file before consuming the end
1635 // of statement to avoid losing it when we switch.
1636 if (EnterIncludeFile(Filename)) {
1637 PrintMessage(IncludeLoc,
1638 "Could not find include file '" + Filename + "'",
1646 /// ParseDirectiveDarwinDumpOrLoad
1647 /// ::= ( .dump | .load ) "filename"
1648 bool AsmParser::ParseDirectiveDarwinDumpOrLoad(SMLoc IDLoc, bool IsDump) {
1649 if (Lexer.isNot(AsmToken::String))
1650 return TokError("expected string in '.dump' or '.load' directive");
1654 if (Lexer.isNot(AsmToken::EndOfStatement))
1655 return TokError("unexpected token in '.dump' or '.load' directive");
1659 // FIXME: If/when .dump and .load are implemented they will be done in the
1660 // the assembly parser and not have any need for an MCStreamer API.
1662 Warning(IDLoc, "ignoring directive .dump for now");
1664 Warning(IDLoc, "ignoring directive .load for now");
1669 /// ParseDirectiveIf
1670 /// ::= .if expression
1671 bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
1672 TheCondStack.push_back(TheCondState);
1673 TheCondState.TheCond = AsmCond::IfCond;
1674 if(TheCondState.Ignore) {
1675 EatToEndOfStatement();
1679 if (ParseAbsoluteExpression(ExprValue))
1682 if (Lexer.isNot(AsmToken::EndOfStatement))
1683 return TokError("unexpected token in '.if' directive");
1687 TheCondState.CondMet = ExprValue;
1688 TheCondState.Ignore = !TheCondState.CondMet;
1694 /// ParseDirectiveElseIf
1695 /// ::= .elseif expression
1696 bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {
1697 if (TheCondState.TheCond != AsmCond::IfCond &&
1698 TheCondState.TheCond != AsmCond::ElseIfCond)
1699 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
1701 TheCondState.TheCond = AsmCond::ElseIfCond;
1703 bool LastIgnoreState = false;
1704 if (!TheCondStack.empty())
1705 LastIgnoreState = TheCondStack.back().Ignore;
1706 if (LastIgnoreState || TheCondState.CondMet) {
1707 TheCondState.Ignore = true;
1708 EatToEndOfStatement();
1712 if (ParseAbsoluteExpression(ExprValue))
1715 if (Lexer.isNot(AsmToken::EndOfStatement))
1716 return TokError("unexpected token in '.elseif' directive");
1719 TheCondState.CondMet = ExprValue;
1720 TheCondState.Ignore = !TheCondState.CondMet;
1726 /// ParseDirectiveElse
1728 bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
1729 if (Lexer.isNot(AsmToken::EndOfStatement))
1730 return TokError("unexpected token in '.else' directive");
1734 if (TheCondState.TheCond != AsmCond::IfCond &&
1735 TheCondState.TheCond != AsmCond::ElseIfCond)
1736 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
1738 TheCondState.TheCond = AsmCond::ElseCond;
1739 bool LastIgnoreState = false;
1740 if (!TheCondStack.empty())
1741 LastIgnoreState = TheCondStack.back().Ignore;
1742 if (LastIgnoreState || TheCondState.CondMet)
1743 TheCondState.Ignore = true;
1745 TheCondState.Ignore = false;
1750 /// ParseDirectiveEndIf
1752 bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
1753 if (Lexer.isNot(AsmToken::EndOfStatement))
1754 return TokError("unexpected token in '.endif' directive");
1758 if ((TheCondState.TheCond == AsmCond::NoCond) ||
1759 TheCondStack.empty())
1760 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
1762 if (!TheCondStack.empty()) {
1763 TheCondState = TheCondStack.back();
1764 TheCondStack.pop_back();
1770 /// ParseDirectiveFile
1771 /// ::= .file [number] string
1772 bool AsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
1773 // FIXME: I'm not sure what this is.
1774 int64_t FileNumber = -1;
1775 if (Lexer.is(AsmToken::Integer)) {
1776 FileNumber = getTok().getIntVal();
1780 return TokError("file number less than one");
1783 if (Lexer.isNot(AsmToken::String))
1784 return TokError("unexpected token in '.file' directive");
1786 StringRef Filename = getTok().getString();
1787 Filename = Filename.substr(1, Filename.size()-2);
1790 if (Lexer.isNot(AsmToken::EndOfStatement))
1791 return TokError("unexpected token in '.file' directive");
1793 if (FileNumber == -1)
1794 Out.EmitFileDirective(Filename);
1796 Out.EmitDwarfFileDirective(FileNumber, Filename);
1801 /// ParseDirectiveLine
1802 /// ::= .line [number]
1803 bool AsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) {
1804 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1805 if (Lexer.isNot(AsmToken::Integer))
1806 return TokError("unexpected token in '.line' directive");
1808 int64_t LineNumber = getTok().getIntVal();
1812 // FIXME: Do something with the .line.
1815 if (Lexer.isNot(AsmToken::EndOfStatement))
1816 return TokError("unexpected token in '.file' directive");
1822 /// ParseDirectiveLoc
1823 /// ::= .loc number [number [number]]
1824 bool AsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) {
1825 if (Lexer.isNot(AsmToken::Integer))
1826 return TokError("unexpected token in '.loc' directive");
1828 // FIXME: What are these fields?
1829 int64_t FileNumber = getTok().getIntVal();
1831 // FIXME: Validate file.
1834 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1835 if (Lexer.isNot(AsmToken::Integer))
1836 return TokError("unexpected token in '.loc' directive");
1838 int64_t Param2 = getTok().getIntVal();
1842 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1843 if (Lexer.isNot(AsmToken::Integer))
1844 return TokError("unexpected token in '.loc' directive");
1846 int64_t Param3 = getTok().getIntVal();
1850 // FIXME: Do something with the .loc.
1854 if (Lexer.isNot(AsmToken::EndOfStatement))
1855 return TokError("unexpected token in '.file' directive");