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9c656450d6
llvm-6502/tools/llvm-mc/AsmParser.cpp
Kevin Enderby 9c656450d6 Added the ParseInstruction() hook for target specific assembler directives so 
that things like .word can be parsed as target specific.  Moved parsing .word
out of AsmParser.cpp into X86AsmParser.cpp as it is 2 bytes on X86 and 4 bytes
for other targets that support the .word directive.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81461 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-10 20:51:44 +00:00

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//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements the parser for assembly files.
//
//===----------------------------------------------------------------------===//
#include "AsmParser.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmParser.h"
using namespace llvm;
// Mach-O section uniquing.
//
// FIXME: Figure out where this should live, it should be shared by
// TargetLoweringObjectFile.
typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
AsmParser::~AsmParser() {
// If we have the MachO uniquing map, free it.
delete (MachOUniqueMapTy*)SectionUniquingMap;
}
const MCSection *AsmParser::getMachOSection(const StringRef &Segment,
const StringRef &Section,
unsigned TypeAndAttributes,
unsigned Reserved2,
SectionKind Kind) const {
// We unique sections by their segment/section pair. The returned section
// may not have the same flags as the requested section, if so this should be
// diagnosed by the client as an error.
// Create the map if it doesn't already exist.
if (SectionUniquingMap == 0)
SectionUniquingMap = new MachOUniqueMapTy();
MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)SectionUniquingMap;
// Form the name to look up.
SmallString<64> Name;
Name += Segment;
Name.push_back(',');
Name += Section;
// Do the lookup, if we have a hit, return it.
const MCSectionMachO *&Entry = Map[Name.str()];
// FIXME: This should validate the type and attributes.
if (Entry) return Entry;
// Otherwise, return a new section.
return Entry = MCSectionMachO::Create(Segment, Section, TypeAndAttributes,
Reserved2, Kind, Ctx);
}
void AsmParser::Warning(SMLoc L, const Twine &Msg) {
Lexer.PrintMessage(L, Msg.str(), "warning");
}
bool AsmParser::Error(SMLoc L, const Twine &Msg) {
Lexer.PrintMessage(L, Msg.str(), "error");
return true;
}
bool AsmParser::TokError(const char *Msg) {
Lexer.PrintMessage(Lexer.getLoc(), Msg, "error");
return true;
}
bool AsmParser::Run() {
// Create the initial section.
//
// FIXME: Support -n.
// FIXME: Target hook & command line option for initial section.
Out.SwitchSection(getMachOSection("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, SectionKind()));
// Prime the lexer.
Lexer.Lex();
bool HadError = false;
AsmCond StartingCondState = TheCondState;
// While we have input, parse each statement.
while (Lexer.isNot(AsmToken::Eof)) {
// Handle conditional assembly here before calling ParseStatement()
if (Lexer.getKind() == AsmToken::Identifier) {
// If we have an identifier, handle it as the key symbol.
AsmToken ID = Lexer.getTok();
SMLoc IDLoc = ID.getLoc();
StringRef IDVal = ID.getString();
if (IDVal == ".if" ||
IDVal == ".elseif" ||
IDVal == ".else" ||
IDVal == ".endif") {
if (!ParseConditionalAssemblyDirectives(IDVal, IDLoc))
continue;
HadError = true;
EatToEndOfStatement();
continue;
}
}
if (TheCondState.Ignore) {
EatToEndOfStatement();
continue;
}
if (!ParseStatement()) continue;
// We had an error, remember it and recover by skipping to the next line.
HadError = true;
EatToEndOfStatement();
}
if (TheCondState.TheCond != StartingCondState.TheCond ||
TheCondState.Ignore != StartingCondState.Ignore)
return TokError("unmatched .ifs or .elses");
if (!HadError)
Out.Finish();
return HadError;
}
/// ParseConditionalAssemblyDirectives - parse the conditional assembly
/// directives
bool AsmParser::ParseConditionalAssemblyDirectives(StringRef Directive,
SMLoc DirectiveLoc) {
if (Directive == ".if")
return ParseDirectiveIf(DirectiveLoc);
if (Directive == ".elseif")
return ParseDirectiveElseIf(DirectiveLoc);
if (Directive == ".else")
return ParseDirectiveElse(DirectiveLoc);
if (Directive == ".endif")
return ParseDirectiveEndIf(DirectiveLoc);
return true;
}
/// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
void AsmParser::EatToEndOfStatement() {
while (Lexer.isNot(AsmToken::EndOfStatement) &&
Lexer.isNot(AsmToken::Eof))
Lexer.Lex();
// Eat EOL.
if (Lexer.is(AsmToken::EndOfStatement))
Lexer.Lex();
}
/// ParseParenExpr - Parse a paren expression and return it.
/// NOTE: This assumes the leading '(' has already been consumed.
///
/// parenexpr ::= expr)
///
bool AsmParser::ParseParenExpr(const MCExpr *&Res) {
if (ParseExpression(Res)) return true;
if (Lexer.isNot(AsmToken::RParen))
return TokError("expected ')' in parentheses expression");
Lexer.Lex();
return false;
}
MCSymbol *AsmParser::CreateSymbol(StringRef Name) {
if (MCSymbol *S = Ctx.LookupSymbol(Name))
return S;
// If the label starts with L it is an assembler temporary label.
if (Name.startswith("L"))
return Ctx.CreateTemporarySymbol(Name);
return Ctx.CreateSymbol(Name);
}
/// ParsePrimaryExpr - Parse a primary expression and return it.
/// primaryexpr ::= (parenexpr
/// primaryexpr ::= symbol
/// primaryexpr ::= number
/// primaryexpr ::= ~,+,- primaryexpr
bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res) {
switch (Lexer.getKind()) {
default:
return TokError("unknown token in expression");
case AsmToken::Exclaim:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = MCUnaryExpr::CreateLNot(Res, getContext());
return false;
case AsmToken::String:
case AsmToken::Identifier: {
// This is a label, this should be parsed as part of an expression, to
// handle things like LFOO+4.
MCSymbol *Sym = CreateSymbol(Lexer.getTok().getIdentifier());
Res = MCSymbolRefExpr::Create(Sym, getContext());
Lexer.Lex(); // Eat identifier.
return false;
}
case AsmToken::Integer:
Res = MCConstantExpr::Create(Lexer.getTok().getIntVal(), getContext());
Lexer.Lex(); // Eat token.
return false;
case AsmToken::LParen:
Lexer.Lex(); // Eat the '('.
return ParseParenExpr(Res);
case AsmToken::Minus:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = MCUnaryExpr::CreateMinus(Res, getContext());
return false;
case AsmToken::Plus:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = MCUnaryExpr::CreatePlus(Res, getContext());
return false;
case AsmToken::Tilde:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = MCUnaryExpr::CreateNot(Res, getContext());
return false;
}
}
/// ParseExpression - Parse an expression and return it.
///
/// expr ::= expr +,- expr -> lowest.
/// expr ::= expr |,^,&,! expr -> middle.
/// expr ::= expr *,/,%,<<,>> expr -> highest.
/// expr ::= primaryexpr
///
bool AsmParser::ParseExpression(const MCExpr *&Res) {
Res = 0;
return ParsePrimaryExpr(Res) ||
ParseBinOpRHS(1, Res);
}
bool AsmParser::ParseParenExpression(const MCExpr *&Res) {
if (ParseParenExpr(Res))
return true;
return false;
}
bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
const MCExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Expr))
return true;
if (!Expr->EvaluateAsAbsolute(Ctx, Res))
return Error(StartLoc, "expected absolute expression");
return false;
}
static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
MCBinaryExpr::Opcode &Kind) {
switch (K) {
default:
return 0; // not a binop.
// Lowest Precedence: &&, ||
case AsmToken::AmpAmp:
Kind = MCBinaryExpr::LAnd;
return 1;
case AsmToken::PipePipe:
Kind = MCBinaryExpr::LOr;
return 1;
// Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
case AsmToken::Plus:
Kind = MCBinaryExpr::Add;
return 2;
case AsmToken::Minus:
Kind = MCBinaryExpr::Sub;
return 2;
case AsmToken::EqualEqual:
Kind = MCBinaryExpr::EQ;
return 2;
case AsmToken::ExclaimEqual:
case AsmToken::LessGreater:
Kind = MCBinaryExpr::NE;
return 2;
case AsmToken::Less:
Kind = MCBinaryExpr::LT;
return 2;
case AsmToken::LessEqual:
Kind = MCBinaryExpr::LTE;
return 2;
case AsmToken::Greater:
Kind = MCBinaryExpr::GT;
return 2;
case AsmToken::GreaterEqual:
Kind = MCBinaryExpr::GTE;
return 2;
// Intermediate Precedence: |, &, ^
//
// FIXME: gas seems to support '!' as an infix operator?
case AsmToken::Pipe:
Kind = MCBinaryExpr::Or;
return 3;
case AsmToken::Caret:
Kind = MCBinaryExpr::Xor;
return 3;
case AsmToken::Amp:
Kind = MCBinaryExpr::And;
return 3;
// Highest Precedence: *, /, %, <<, >>
case AsmToken::Star:
Kind = MCBinaryExpr::Mul;
return 4;
case AsmToken::Slash:
Kind = MCBinaryExpr::Div;
return 4;
case AsmToken::Percent:
Kind = MCBinaryExpr::Mod;
return 4;
case AsmToken::LessLess:
Kind = MCBinaryExpr::Shl;
return 4;
case AsmToken::GreaterGreater:
Kind = MCBinaryExpr::Shr;
return 4;
}
}
/// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
/// Res contains the LHS of the expression on input.
bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res) {
while (1) {
MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
// If the next token is lower precedence than we are allowed to eat, return
// successfully with what we ate already.
if (TokPrec < Precedence)
return false;
Lexer.Lex();
// Eat the next primary expression.
const MCExpr *RHS;
if (ParsePrimaryExpr(RHS)) return true;
// If BinOp binds less tightly with RHS than the operator after RHS, let
// the pending operator take RHS as its LHS.
MCBinaryExpr::Opcode Dummy;
unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
if (TokPrec < NextTokPrec) {
if (ParseBinOpRHS(Precedence+1, RHS)) return true;
}
// Merge LHS and RHS according to operator.
Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
}
}
/// ParseStatement:
/// ::= EndOfStatement
/// ::= Label* Directive ...Operands... EndOfStatement
/// ::= Label* Identifier OperandList* EndOfStatement
bool AsmParser::ParseStatement() {
if (Lexer.is(AsmToken::EndOfStatement)) {
Lexer.Lex();
return false;
}
// Statements always start with an identifier.
AsmToken ID = Lexer.getTok();
SMLoc IDLoc = ID.getLoc();
StringRef IDVal;
if (ParseIdentifier(IDVal))
return TokError("unexpected token at start of statement");
// FIXME: Recurse on local labels?
// See what kind of statement we have.
switch (Lexer.getKind()) {
case AsmToken::Colon: {
// identifier ':' -> Label.
Lexer.Lex();
// Diagnose attempt to use a variable as a label.
//
// FIXME: Diagnostics. Note the location of the definition as a label.
// FIXME: This doesn't diagnose assignment to a symbol which has been
// implicitly marked as external.
MCSymbol *Sym = CreateSymbol(IDVal);
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
// Emit the label.
Out.EmitLabel(Sym);
return ParseStatement();
}
case AsmToken::Equal:
// identifier '=' ... -> assignment statement
Lexer.Lex();
return ParseAssignment(IDVal);
default: // Normal instruction or directive.
break;
}
// Otherwise, we have a normal instruction or directive.
if (IDVal[0] == '.') {
// FIXME: This should be driven based on a hash lookup and callback.
if (IDVal == ".section")
return ParseDirectiveDarwinSection();
if (IDVal == ".text")
// FIXME: This changes behavior based on the -static flag to the
// assembler.
return ParseDirectiveSectionSwitch("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
if (IDVal == ".const")
return ParseDirectiveSectionSwitch("__TEXT", "__const");
if (IDVal == ".static_const")
return ParseDirectiveSectionSwitch("__TEXT", "__static_const");
if (IDVal == ".cstring")
return ParseDirectiveSectionSwitch("__TEXT","__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".literal4")
return ParseDirectiveSectionSwitch("__TEXT", "__literal4",
MCSectionMachO::S_4BYTE_LITERALS,
4);
if (IDVal == ".literal8")
return ParseDirectiveSectionSwitch("__TEXT", "__literal8",
MCSectionMachO::S_8BYTE_LITERALS,
8);
if (IDVal == ".literal16")
return ParseDirectiveSectionSwitch("__TEXT","__literal16",
MCSectionMachO::S_16BYTE_LITERALS,
16);
if (IDVal == ".constructor")
return ParseDirectiveSectionSwitch("__TEXT","__constructor");
if (IDVal == ".destructor")
return ParseDirectiveSectionSwitch("__TEXT","__destructor");
if (IDVal == ".fvmlib_init0")
return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init0");
if (IDVal == ".fvmlib_init1")
return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init1");
// FIXME: The assembler manual claims that this has the self modify code
// flag, at least on x86-32, but that does not appear to be correct.
if (IDVal == ".symbol_stub")
return ParseDirectiveSectionSwitch("__TEXT","__symbol_stub",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
// FIXME: Different on PPC and ARM.
0, 16);
// FIXME: PowerPC only?
if (IDVal == ".picsymbol_stub")
return ParseDirectiveSectionSwitch("__TEXT","__picsymbol_stub",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, 26);
if (IDVal == ".data")
return ParseDirectiveSectionSwitch("__DATA", "__data");
if (IDVal == ".static_data")
return ParseDirectiveSectionSwitch("__DATA", "__static_data");
// FIXME: The section names of these two are misspelled in the assembler
// manual.
if (IDVal == ".non_lazy_symbol_pointer")
return ParseDirectiveSectionSwitch("__DATA", "__nl_symbol_ptr",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
4);
if (IDVal == ".lazy_symbol_pointer")
return ParseDirectiveSectionSwitch("__DATA", "__la_symbol_ptr",
MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
4);
if (IDVal == ".dyld")
return ParseDirectiveSectionSwitch("__DATA", "__dyld");
if (IDVal == ".mod_init_func")
return ParseDirectiveSectionSwitch("__DATA", "__mod_init_func",
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
4);
if (IDVal == ".mod_term_func")
return ParseDirectiveSectionSwitch("__DATA", "__mod_term_func",
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
4);
if (IDVal == ".const_data")
return ParseDirectiveSectionSwitch("__DATA", "__const");
if (IDVal == ".objc_class")
return ParseDirectiveSectionSwitch("__OBJC", "__class",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_meta_class")
return ParseDirectiveSectionSwitch("__OBJC", "__meta_class",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cat_cls_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cat_cls_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cat_inst_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cat_inst_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_protocol")
return ParseDirectiveSectionSwitch("__OBJC", "__protocol",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_string_object")
return ParseDirectiveSectionSwitch("__OBJC", "__string_object",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cls_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cls_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_inst_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__inst_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cls_refs")
return ParseDirectiveSectionSwitch("__OBJC", "__cls_refs",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
MCSectionMachO::S_LITERAL_POINTERS,
4);
if (IDVal == ".objc_message_refs")
return ParseDirectiveSectionSwitch("__OBJC", "__message_refs",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
MCSectionMachO::S_LITERAL_POINTERS,
4);
if (IDVal == ".objc_symbols")
return ParseDirectiveSectionSwitch("__OBJC", "__symbols",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_category")
return ParseDirectiveSectionSwitch("__OBJC", "__category",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_class_vars")
return ParseDirectiveSectionSwitch("__OBJC", "__class_vars",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_instance_vars")
return ParseDirectiveSectionSwitch("__OBJC", "__instance_vars",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_module_info")
return ParseDirectiveSectionSwitch("__OBJC", "__module_info",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_class_names")
return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".objc_meth_var_types")
return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".objc_meth_var_names")
return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".objc_selector_strs")
return ParseDirectiveSectionSwitch("__OBJC", "__selector_strs",
MCSectionMachO::S_CSTRING_LITERALS);
// Assembler features
if (IDVal == ".set")
return ParseDirectiveSet();
// Data directives
if (IDVal == ".ascii")
return ParseDirectiveAscii(false);
if (IDVal == ".asciz")
return ParseDirectiveAscii(true);
if (IDVal == ".byte")
return ParseDirectiveValue(1);
if (IDVal == ".short")
return ParseDirectiveValue(2);
if (IDVal == ".long")
return ParseDirectiveValue(4);
if (IDVal == ".quad")
return ParseDirectiveValue(8);
// FIXME: Target hooks for IsPow2.
if (IDVal == ".align")
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
if (IDVal == ".align32")
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
if (IDVal == ".balign")
return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
if (IDVal == ".balignw")
return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
if (IDVal == ".balignl")
return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
if (IDVal == ".p2align")
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
if (IDVal == ".p2alignw")
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
if (IDVal == ".p2alignl")
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
if (IDVal == ".org")
return ParseDirectiveOrg();
if (IDVal == ".fill")
return ParseDirectiveFill();
if (IDVal == ".space")
return ParseDirectiveSpace();
// Symbol attribute directives
if (IDVal == ".globl" || IDVal == ".global")
return ParseDirectiveSymbolAttribute(MCStreamer::Global);
if (IDVal == ".hidden")
return ParseDirectiveSymbolAttribute(MCStreamer::Hidden);
if (IDVal == ".indirect_symbol")
return ParseDirectiveSymbolAttribute(MCStreamer::IndirectSymbol);
if (IDVal == ".internal")
return ParseDirectiveSymbolAttribute(MCStreamer::Internal);
if (IDVal == ".lazy_reference")
return ParseDirectiveSymbolAttribute(MCStreamer::LazyReference);
if (IDVal == ".no_dead_strip")
return ParseDirectiveSymbolAttribute(MCStreamer::NoDeadStrip);
if (IDVal == ".private_extern")
return ParseDirectiveSymbolAttribute(MCStreamer::PrivateExtern);
if (IDVal == ".protected")
return ParseDirectiveSymbolAttribute(MCStreamer::Protected);
if (IDVal == ".reference")
return ParseDirectiveSymbolAttribute(MCStreamer::Reference);
if (IDVal == ".weak")
return ParseDirectiveSymbolAttribute(MCStreamer::Weak);
if (IDVal == ".weak_definition")
return ParseDirectiveSymbolAttribute(MCStreamer::WeakDefinition);
if (IDVal == ".weak_reference")
return ParseDirectiveSymbolAttribute(MCStreamer::WeakReference);
if (IDVal == ".comm")
return ParseDirectiveComm(/*IsLocal=*/false);
if (IDVal == ".lcomm")
return ParseDirectiveComm(/*IsLocal=*/true);
if (IDVal == ".zerofill")
return ParseDirectiveDarwinZerofill();
if (IDVal == ".desc")
return ParseDirectiveDarwinSymbolDesc();
if (IDVal == ".lsym")
return ParseDirectiveDarwinLsym();
if (IDVal == ".subsections_via_symbols")
return ParseDirectiveDarwinSubsectionsViaSymbols();
if (IDVal == ".abort")
return ParseDirectiveAbort();
if (IDVal == ".include")
return ParseDirectiveInclude();
if (IDVal == ".dump")
return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsDump=*/true);
if (IDVal == ".load")
return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsLoad=*/false);
// Debugging directives
if (IDVal == ".file")
return ParseDirectiveFile(IDLoc);
if (IDVal == ".line")
return ParseDirectiveLine(IDLoc);
if (IDVal == ".loc")
return ParseDirectiveLoc(IDLoc);
// Target hook for parsing target specific directives.
if (!getTargetParser().ParseDirective(ID))
return false;
Warning(IDLoc, "ignoring directive for now");
EatToEndOfStatement();
return false;
}
MCInst Inst;
if (getTargetParser().ParseInstruction(IDVal, Inst))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in argument list");
// Eat the end of statement marker.
Lexer.Lex();
// Instruction is good, process it.
Out.EmitInstruction(Inst);
// Skip to end of line for now.
return false;
}
bool AsmParser::ParseAssignment(const StringRef &Name) {
// FIXME: Use better location, we should use proper tokens.
SMLoc EqualLoc = Lexer.getLoc();
const MCExpr *Value;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Value))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in assignment");
// Eat the end of statement marker.
Lexer.Lex();
// Diagnose assignment to a label.
//
// FIXME: Diagnostics. Note the location of the definition as a label.
// FIXME: Handle '.'.
// FIXME: Diagnose assignment to protected identifier (e.g., register name).
MCSymbol *Sym = CreateSymbol(Name);
if (!Sym->isUndefined() && !Sym->isAbsolute())
return Error(EqualLoc, "symbol has already been defined");
// Do the assignment.
Out.EmitAssignment(Sym, Value);
return false;
}
/// ParseIdentifier:
/// ::= identifier
/// ::= string
bool AsmParser::ParseIdentifier(StringRef &Res) {
if (Lexer.isNot(AsmToken::Identifier) &&
Lexer.isNot(AsmToken::String))
return true;
Res = Lexer.getTok().getIdentifier();
Lexer.Lex(); // Consume the identifier token.
return false;
}
/// ParseDirectiveSet:
/// ::= .set identifier ',' expression
bool AsmParser::ParseDirectiveSet() {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier after '.set' directive");
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.set'");
Lexer.Lex();
return ParseAssignment(Name);
}
/// ParseDirectiveSection:
/// ::= .section identifier (',' identifier)*
/// FIXME: This should actually parse out the segment, section, attributes and
/// sizeof_stub fields.
bool AsmParser::ParseDirectiveDarwinSection() {
SMLoc Loc = Lexer.getLoc();
StringRef SectionName;
if (ParseIdentifier(SectionName))
return Error(Loc, "expected identifier after '.section' directive");
// Verify there is a following comma.
if (!Lexer.is(AsmToken::Comma))
return TokError("unexpected token in '.section' directive");
std::string SectionSpec = SectionName;
SectionSpec += ",";
// Add all the tokens until the end of the line, ParseSectionSpecifier will
// handle this.
StringRef EOL = Lexer.LexUntilEndOfStatement();
SectionSpec.append(EOL.begin(), EOL.end());
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.section' directive");
Lexer.Lex();
StringRef Segment, Section;
unsigned TAA, StubSize;
std::string ErrorStr =
MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
TAA, StubSize);
if (!ErrorStr.empty())
return Error(Loc, ErrorStr.c_str());
// FIXME: Arch specific.
Out.SwitchSection(getMachOSection(Segment, Section, TAA, StubSize,
SectionKind()));
return false;
}
/// ParseDirectiveSectionSwitch -
bool AsmParser::ParseDirectiveSectionSwitch(const char *Segment,
const char *Section,
unsigned TAA, unsigned Align,
unsigned StubSize) {
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in section switching directive");
Lexer.Lex();
// FIXME: Arch specific.
Out.SwitchSection(getMachOSection(Segment, Section, TAA, StubSize,
SectionKind()));
// Set the implicit alignment, if any.
//
// FIXME: This isn't really what 'as' does; I think it just uses the implicit
// alignment on the section (e.g., if one manually inserts bytes into the
// section, then just issueing the section switch directive will not realign
// the section. However, this is arguably more reasonable behavior, and there
// is no good reason for someone to intentionally emit incorrectly sized
// values into the implicitly aligned sections.
if (Align)
Out.EmitValueToAlignment(Align, 0, 1, 0);
return false;
}
bool AsmParser::ParseEscapedString(std::string &Data) {
assert(Lexer.is(AsmToken::String) && "Unexpected current token!");
Data = "";
StringRef Str = Lexer.getTok().getStringContents();
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
if (Str[i] != '\\') {
Data += Str[i];
continue;
}
// Recognize escaped characters. Note that this escape semantics currently
// loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
++i;
if (i == e)
return TokError("unexpected backslash at end of string");
// Recognize octal sequences.
if ((unsigned) (Str[i] - '0') <= 7) {
// Consume up to three octal characters.
unsigned Value = Str[i] - '0';
if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
++i;
Value = Value * 8 + (Str[i] - '0');
if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
++i;
Value = Value * 8 + (Str[i] - '0');
}
}
if (Value > 255)
return TokError("invalid octal escape sequence (out of range)");
Data += (unsigned char) Value;
continue;
}
// Otherwise recognize individual escapes.
switch (Str[i]) {
default:
// Just reject invalid escape sequences for now.
return TokError("invalid escape sequence (unrecognized character)");
case 'b': Data += '\b'; break;
case 'f': Data += '\f'; break;
case 'n': Data += '\n'; break;
case 'r': Data += '\r'; break;
case 't': Data += '\t'; break;
case '"': Data += '"'; break;
case '\\': Data += '\\'; break;
}
}
return false;
}
/// ParseDirectiveAscii:
/// ::= ( .ascii | .asciz ) [ "string" ( , "string" )* ]
bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.ascii' or '.asciz' directive");
std::string Data;
if (ParseEscapedString(Data))
return true;
Out.EmitBytes(Data);
if (ZeroTerminated)
Out.EmitBytes(StringRef("\0", 1));
Lexer.Lex();
if (Lexer.is(AsmToken::EndOfStatement))
break;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.ascii' or '.asciz' directive");
Lexer.Lex();
}
}
Lexer.Lex();
return false;
}
/// ParseDirectiveValue
/// ::= (.byte | .short | ... ) [ expression (, expression)* ]
bool AsmParser::ParseDirectiveValue(unsigned Size) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
const MCExpr *Value;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Value))
return true;
Out.EmitValue(Value, Size);
if (Lexer.is(AsmToken::EndOfStatement))
break;
// FIXME: Improve diagnostic.
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
}
}
Lexer.Lex();
return false;
}
/// ParseDirectiveSpace
/// ::= .space expression [ , expression ]
bool AsmParser::ParseDirectiveSpace() {
int64_t NumBytes;
if (ParseAbsoluteExpression(NumBytes))
return true;
int64_t FillExpr = 0;
bool HasFillExpr = false;
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.space' directive");
Lexer.Lex();
if (ParseAbsoluteExpression(FillExpr))
return true;
HasFillExpr = true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.space' directive");
}
Lexer.Lex();
if (NumBytes <= 0)
return TokError("invalid number of bytes in '.space' directive");
// FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
Out.EmitValue(MCConstantExpr::Create(FillExpr, getContext()), 1);
return false;
}
/// ParseDirectiveFill
/// ::= .fill expression , expression , expression
bool AsmParser::ParseDirectiveFill() {
int64_t NumValues;
if (ParseAbsoluteExpression(NumValues))
return true;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.fill' directive");
Lexer.Lex();
int64_t FillSize;
if (ParseAbsoluteExpression(FillSize))
return true;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.fill' directive");
Lexer.Lex();
int64_t FillExpr;
if (ParseAbsoluteExpression(FillExpr))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.fill' directive");
Lexer.Lex();
if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
for (uint64_t i = 0, e = NumValues; i != e; ++i)
Out.EmitValue(MCConstantExpr::Create(FillExpr, getContext()), FillSize);
return false;
}
/// ParseDirectiveOrg
/// ::= .org expression [ , expression ]
bool AsmParser::ParseDirectiveOrg() {
const MCExpr *Offset;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Offset))
return true;
// Parse optional fill expression.
int64_t FillExpr = 0;
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.org' directive");
Lexer.Lex();
if (ParseAbsoluteExpression(FillExpr))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.org' directive");
}
Lexer.Lex();
// FIXME: Only limited forms of relocatable expressions are accepted here, it
// has to be relative to the current section.
Out.EmitValueToOffset(Offset, FillExpr);
return false;
}
/// ParseDirectiveAlign
/// ::= {.align, ...} expression [ , expression [ , expression ]]
bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
SMLoc AlignmentLoc = Lexer.getLoc();
int64_t Alignment;
if (ParseAbsoluteExpression(Alignment))
return true;
SMLoc MaxBytesLoc;
bool HasFillExpr = false;
int64_t FillExpr = 0;
int64_t MaxBytesToFill = 0;
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
// The fill expression can be omitted while specifying a maximum number of
// alignment bytes, e.g:
// .align 3,,4
if (Lexer.isNot(AsmToken::Comma)) {
HasFillExpr = true;
if (ParseAbsoluteExpression(FillExpr))
return true;
}
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
MaxBytesLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(MaxBytesToFill))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
}
}
Lexer.Lex();
if (!HasFillExpr) {
// FIXME: Sometimes fill with nop.
FillExpr = 0;
}
// Compute alignment in bytes.
if (IsPow2) {
// FIXME: Diagnose overflow.
if (Alignment >= 32) {
Error(AlignmentLoc, "invalid alignment value");
Alignment = 31;
}
Alignment = 1ULL << Alignment;
}
// Diagnose non-sensical max bytes to align.
if (MaxBytesLoc.isValid()) {
if (MaxBytesToFill < 1) {
Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
"many bytes, ignoring maximum bytes expression");
MaxBytesToFill = 0;
}
if (MaxBytesToFill >= Alignment) {
Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
"has no effect");
MaxBytesToFill = 0;
}
}
// FIXME: Target specific behavior about how the "extra" bytes are filled.
Out.EmitValueToAlignment(Alignment, FillExpr, ValueSize, MaxBytesToFill);
return false;
}
/// ParseDirectiveSymbolAttribute
/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = CreateSymbol(Name);
Out.EmitSymbolAttribute(Sym, Attr);
if (Lexer.is(AsmToken::EndOfStatement))
break;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
}
}
Lexer.Lex();
return false;
}
/// ParseDirectiveDarwinSymbolDesc
/// ::= .desc identifier , expression
bool AsmParser::ParseDirectiveDarwinSymbolDesc() {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
// Handle the identifier as the key symbol.
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.desc' directive");
Lexer.Lex();
SMLoc DescLoc = Lexer.getLoc();
int64_t DescValue;
if (ParseAbsoluteExpression(DescValue))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.desc' directive");
Lexer.Lex();
// Set the n_desc field of this Symbol to this DescValue
Out.EmitSymbolDesc(Sym, DescValue);
return false;
}
/// ParseDirectiveComm
/// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
bool AsmParser::ParseDirectiveComm(bool IsLocal) {
SMLoc IDLoc = Lexer.getLoc();
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
// Handle the identifier as the key symbol.
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
int64_t Size;
SMLoc SizeLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (Lexer.is(AsmToken::Comma)) {
Lexer.Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.comm' or '.lcomm' directive");
Lexer.Lex();
// NOTE: a size of zero for a .comm should create a undefined symbol
// but a size of .lcomm creates a bss symbol of size zero.
if (Size < 0)
return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
"be less than zero");
// NOTE: The alignment in the directive is a power of 2 value, the assember
// may internally end up wanting an alignment in bytes.
// FIXME: Diagnose overflow.
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
"alignment, can't be less than zero");
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
// '.lcomm' is equivalent to '.zerofill'.
// Create the Symbol as a common or local common with Size and Pow2Alignment
if (IsLocal) {
Out.EmitZerofill(getMachOSection("__DATA", "__bss",
MCSectionMachO::S_ZEROFILL, 0,
SectionKind()),
Sym, Size, 1 << Pow2Alignment);
return false;
}
Out.EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
return false;
}
/// ParseDirectiveDarwinZerofill
/// ::= .zerofill segname , sectname [, identifier , size_expression [
/// , align_expression ]]
bool AsmParser::ParseDirectiveDarwinZerofill() {
// FIXME: Handle quoted names here.
if (Lexer.isNot(AsmToken::Identifier))
return TokError("expected segment name after '.zerofill' directive");
StringRef Segment = Lexer.getTok().getString();
Lexer.Lex();
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
if (Lexer.isNot(AsmToken::Identifier))
return TokError("expected section name after comma in '.zerofill' "
"directive");
StringRef Section = Lexer.getTok().getString();
Lexer.Lex();
// If this is the end of the line all that was wanted was to create the
// the section but with no symbol.
if (Lexer.is(AsmToken::EndOfStatement)) {
// Create the zerofill section but no symbol
Out.EmitZerofill(getMachOSection(Segment, Section,
MCSectionMachO::S_ZEROFILL, 0,
SectionKind()));
return false;
}
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
if (Lexer.isNot(AsmToken::Identifier))
return TokError("expected identifier in directive");
// handle the identifier as the key symbol.
SMLoc IDLoc = Lexer.getLoc();
MCSymbol *Sym = CreateSymbol(Lexer.getTok().getString());
Lexer.Lex();
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
int64_t Size;
SMLoc SizeLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (Lexer.is(AsmToken::Comma)) {
Lexer.Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.zerofill' directive");
Lexer.Lex();
if (Size < 0)
return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
"than zero");
// NOTE: The alignment in the directive is a power of 2 value, the assember
// may internally end up wanting an alignment in bytes.
// FIXME: Diagnose overflow.
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
"can't be less than zero");
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
// Create the zerofill Symbol with Size and Pow2Alignment
//
// FIXME: Arch specific.
Out.EmitZerofill(getMachOSection(Segment, Section,
MCSectionMachO::S_ZEROFILL, 0,
SectionKind()),
Sym, Size, 1 << Pow2Alignment);
return false;
}
/// ParseDirectiveDarwinSubsectionsViaSymbols
/// ::= .subsections_via_symbols
bool AsmParser::ParseDirectiveDarwinSubsectionsViaSymbols() {
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.subsections_via_symbols' directive");
Lexer.Lex();
Out.EmitAssemblerFlag(MCStreamer::SubsectionsViaSymbols);
return false;
}
/// ParseDirectiveAbort
/// ::= .abort [ "abort_string" ]
bool AsmParser::ParseDirectiveAbort() {
// FIXME: Use loc from directive.
SMLoc Loc = Lexer.getLoc();
StringRef Str = "";
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.abort' directive");
Str = Lexer.getTok().getString();
Lexer.Lex();
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.abort' directive");
Lexer.Lex();
// FIXME: Handle here.
if (Str.empty())
Error(Loc, ".abort detected. Assembly stopping.");
else
Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
return false;
}
/// ParseDirectiveLsym
/// ::= .lsym identifier , expression
bool AsmParser::ParseDirectiveDarwinLsym() {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
// Handle the identifier as the key symbol.
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.lsym' directive");
Lexer.Lex();
const MCExpr *Value;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Value))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.lsym' directive");
Lexer.Lex();
// We don't currently support this directive.
//
// FIXME: Diagnostic location!
(void) Sym;
return TokError("directive '.lsym' is unsupported");
}
/// ParseDirectiveInclude
/// ::= .include "filename"
bool AsmParser::ParseDirectiveInclude() {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.include' directive");
std::string Filename = Lexer.getTok().getString();
SMLoc IncludeLoc = Lexer.getLoc();
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.include' directive");
// Strip the quotes.
Filename = Filename.substr(1, Filename.size()-2);
// Attempt to switch the lexer to the included file before consuming the end
// of statement to avoid losing it when we switch.
if (Lexer.EnterIncludeFile(Filename)) {
Lexer.PrintMessage(IncludeLoc,
"Could not find include file '" + Filename + "'",
"error");
return true;
}
return false;
}
/// ParseDirectiveDarwinDumpOrLoad
/// ::= ( .dump | .load ) "filename"
bool AsmParser::ParseDirectiveDarwinDumpOrLoad(SMLoc IDLoc, bool IsDump) {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.dump' or '.load' directive");
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.dump' or '.load' directive");
Lexer.Lex();
// FIXME: If/when .dump and .load are implemented they will be done in the
// the assembly parser and not have any need for an MCStreamer API.
if (IsDump)
Warning(IDLoc, "ignoring directive .dump for now");
else
Warning(IDLoc, "ignoring directive .load for now");
return false;
}
/// ParseDirectiveIf
/// ::= .if expression
bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
// Consume the identifier that was the .if directive
Lexer.Lex();
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;
if(TheCondState.Ignore) {
EatToEndOfStatement();
}
else {
int64_t ExprValue;
if (ParseAbsoluteExpression(ExprValue))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.if' directive");
Lexer.Lex();
TheCondState.CondMet = ExprValue;
TheCondState.Ignore = !TheCondState.CondMet;
}
return false;
}
/// ParseDirectiveElseIf
/// ::= .elseif expression
bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {
if (TheCondState.TheCond != AsmCond::IfCond &&
TheCondState.TheCond != AsmCond::ElseIfCond)
Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
" an .elseif");
TheCondState.TheCond = AsmCond::ElseIfCond;
// Consume the identifier that was the .elseif directive
Lexer.Lex();
bool LastIgnoreState = false;
if (!TheCondStack.empty())
LastIgnoreState = TheCondStack.back().Ignore;
if (LastIgnoreState || TheCondState.CondMet) {
TheCondState.Ignore = true;
EatToEndOfStatement();
}
else {
int64_t ExprValue;
if (ParseAbsoluteExpression(ExprValue))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.elseif' directive");
Lexer.Lex();
TheCondState.CondMet = ExprValue;
TheCondState.Ignore = !TheCondState.CondMet;
}
return false;
}
/// ParseDirectiveElse
/// ::= .else
bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
// Consume the identifier that was the .else directive
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.else' directive");
Lexer.Lex();
if (TheCondState.TheCond != AsmCond::IfCond &&
TheCondState.TheCond != AsmCond::ElseIfCond)
Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
".elseif");
TheCondState.TheCond = AsmCond::ElseCond;
bool LastIgnoreState = false;
if (!TheCondStack.empty())
LastIgnoreState = TheCondStack.back().Ignore;
if (LastIgnoreState || TheCondState.CondMet)
TheCondState.Ignore = true;
else
TheCondState.Ignore = false;
return false;
}
/// ParseDirectiveEndIf
/// ::= .endif
bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
// Consume the identifier that was the .endif directive
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.endif' directive");
Lexer.Lex();
if ((TheCondState.TheCond == AsmCond::NoCond) ||
TheCondStack.empty())
Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
".else");
if (!TheCondStack.empty()) {
TheCondState = TheCondStack.back();
TheCondStack.pop_back();
}
return false;
}
/// ParseDirectiveFile
/// ::= .file [number] string
bool AsmParser::ParseDirectiveFile(SMLoc DirectiveLoc) {
// FIXME: I'm not sure what this is.
int64_t FileNumber = -1;
if (Lexer.is(AsmToken::Integer)) {
FileNumber = Lexer.getTok().getIntVal();
Lexer.Lex();
if (FileNumber < 1)
return TokError("file number less than one");
}
if (Lexer.isNot(AsmToken::String))
return TokError("unexpected token in '.file' directive");
StringRef FileName = Lexer.getTok().getString();
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.file' directive");
// FIXME: Do something with the .file.
return false;
}
/// ParseDirectiveLine
/// ::= .line [number]
bool AsmParser::ParseDirectiveLine(SMLoc DirectiveLoc) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.line' directive");
int64_t LineNumber = Lexer.getTok().getIntVal();
(void) LineNumber;
Lexer.Lex();
// FIXME: Do something with the .line.
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.file' directive");
return false;
}
/// ParseDirectiveLoc
/// ::= .loc number [number [number]]
bool AsmParser::ParseDirectiveLoc(SMLoc DirectiveLoc) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");
// FIXME: What are these fields?
int64_t FileNumber = Lexer.getTok().getIntVal();
(void) FileNumber;
// FIXME: Validate file.
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");
int64_t Param2 = Lexer.getTok().getIntVal();
(void) Param2;
Lexer.Lex();
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");
int64_t Param3 = Lexer.getTok().getIntVal();
(void) Param3;
Lexer.Lex();
// FIXME: Do something with the .loc.
}
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.file' directive");
return false;
}
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