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llvm/tools/llvm-mc/AsmParser.cpp
Daniel Dunbar 1ab7594946 llvm-mc: Support escaped characters in string literals (for .ascii and .asciz) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79010 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-14 18:19:52 +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 "AsmExpr.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCContext.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;
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() {
// 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");
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(AsmExpr *&Res) {
if (ParseExpression(Res)) return true;
if (Lexer.isNot(AsmToken::RParen))
return TokError("expected ')' in parentheses expression");
Lexer.Lex();
return false;
}
/// ParsePrimaryExpr - Parse a primary expression and return it.
/// primaryexpr ::= (parenexpr
/// primaryexpr ::= symbol
/// primaryexpr ::= number
/// primaryexpr ::= ~,+,- primaryexpr
bool AsmParser::ParsePrimaryExpr(AsmExpr *&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 = new AsmUnaryExpr(AsmUnaryExpr::LNot, Res);
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 = Ctx.GetOrCreateSymbol(Lexer.getTok().getIdentifier());
// If this is use of an undefined symbol then mark it external.
if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
Sym->setExternal(true);
Res = new AsmSymbolRefExpr(Sym);
Lexer.Lex(); // Eat identifier.
return false;
}
case AsmToken::Integer:
Res = new AsmConstantExpr(Lexer.getTok().getIntVal());
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 = new AsmUnaryExpr(AsmUnaryExpr::Minus, Res);
return false;
case AsmToken::Plus:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = new AsmUnaryExpr(AsmUnaryExpr::Plus, Res);
return false;
case AsmToken::Tilde:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = new AsmUnaryExpr(AsmUnaryExpr::Not, Res);
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(AsmExpr *&Res) {
Res = 0;
return ParsePrimaryExpr(Res) ||
ParseBinOpRHS(1, Res);
}
bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
AsmExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Expr))
return true;
if (!Expr->EvaluateAsAbsolute(Ctx, Res))
return Error(StartLoc, "expected absolute expression");
return false;
}
bool AsmParser::ParseRelocatableExpression(MCValue &Res) {
AsmExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Expr))
return true;
if (!Expr->EvaluateAsRelocatable(Ctx, Res))
return Error(StartLoc, "expected relocatable expression");
return false;
}
bool AsmParser::ParseParenRelocatableExpression(MCValue &Res) {
AsmExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseParenExpr(Expr))
return true;
if (!Expr->EvaluateAsRelocatable(Ctx, Res))
return Error(StartLoc, "expected relocatable expression");
return false;
}
static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
AsmBinaryExpr::Opcode &Kind) {
switch (K) {
default: return 0; // not a binop.
// Lowest Precedence: &&, ||
case AsmToken::AmpAmp:
Kind = AsmBinaryExpr::LAnd;
return 1;
case AsmToken::PipePipe:
Kind = AsmBinaryExpr::LOr;
return 1;
// Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
case AsmToken::Plus:
Kind = AsmBinaryExpr::Add;
return 2;
case AsmToken::Minus:
Kind = AsmBinaryExpr::Sub;
return 2;
case AsmToken::EqualEqual:
Kind = AsmBinaryExpr::EQ;
return 2;
case AsmToken::ExclaimEqual:
case AsmToken::LessGreater:
Kind = AsmBinaryExpr::NE;
return 2;
case AsmToken::Less:
Kind = AsmBinaryExpr::LT;
return 2;
case AsmToken::LessEqual:
Kind = AsmBinaryExpr::LTE;
return 2;
case AsmToken::Greater:
Kind = AsmBinaryExpr::GT;
return 2;
case AsmToken::GreaterEqual:
Kind = AsmBinaryExpr::GTE;
return 2;
// Intermediate Precedence: |, &, ^
//
// FIXME: gas seems to support '!' as an infix operator?
case AsmToken::Pipe:
Kind = AsmBinaryExpr::Or;
return 3;
case AsmToken::Caret:
Kind = AsmBinaryExpr::Xor;
return 3;
case AsmToken::Amp:
Kind = AsmBinaryExpr::And;
return 3;
// Highest Precedence: *, /, %, <<, >>
case AsmToken::Star:
Kind = AsmBinaryExpr::Mul;
return 4;
case AsmToken::Slash:
Kind = AsmBinaryExpr::Div;
return 4;
case AsmToken::Percent:
Kind = AsmBinaryExpr::Mod;
return 4;
case AsmToken::LessLess:
Kind = AsmBinaryExpr::Shl;
return 4;
case AsmToken::GreaterGreater:
Kind = AsmBinaryExpr::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, AsmExpr *&Res) {
while (1) {
AsmBinaryExpr::Opcode Kind = AsmBinaryExpr::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.
AsmExpr *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.
AsmBinaryExpr::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 = new AsmBinaryExpr(Kind, Res, RHS);
}
}
/// 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 = Ctx.GetOrCreateSymbol(IDVal);
if (Sym->getSection())
return Error(IDLoc, "invalid symbol redefinition");
if (Ctx.GetSymbolValue(Sym))
return Error(IDLoc, "symbol already used as assembler variable");
// Since we saw a label, create a symbol and emit it.
// FIXME: If the label starts with L it is an assembler temporary label.
// Why does the client of this api need to know this?
Out.EmitLabel(Sym);
return ParseStatement();
}
case AsmToken::Equal:
// identifier '=' ... -> assignment statement
Lexer.Lex();
return ParseAssignment(IDVal, false);
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", 0);
if (IDVal == ".static_const")
return ParseDirectiveSectionSwitch("__TEXT", "__static_const", 0);
if (IDVal == ".cstring")
return ParseDirectiveSectionSwitch("__TEXT","__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".literal4")
return ParseDirectiveSectionSwitch("__TEXT", "__literal4",
MCSectionMachO::S_4BYTE_LITERALS);
if (IDVal == ".literal8")
return ParseDirectiveSectionSwitch("__TEXT", "__literal8",
MCSectionMachO::S_8BYTE_LITERALS);
if (IDVal == ".literal16")
return ParseDirectiveSectionSwitch("__TEXT","__literal16",
MCSectionMachO::S_16BYTE_LITERALS);
if (IDVal == ".constructor")
return ParseDirectiveSectionSwitch("__TEXT","__constructor", 0);
if (IDVal == ".destructor")
return ParseDirectiveSectionSwitch("__TEXT","__destructor", 0);
if (IDVal == ".fvmlib_init0")
return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init0", 0);
if (IDVal == ".fvmlib_init1")
return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init1", 0);
if (IDVal == ".symbol_stub")
return ParseDirectiveSectionSwitch("__TEXT","__symbol_stub",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
// FIXME: Different on PPC and ARM.
16);
// FIXME: .picsymbol_stub on PPC.
if (IDVal == ".data")
return ParseDirectiveSectionSwitch("__DATA", "__data", 0);
if (IDVal == ".static_data")
return ParseDirectiveSectionSwitch("__DATA", "__static_data", 0);
if (IDVal == ".non_lazy_symbol_pointer")
return ParseDirectiveSectionSwitch("__DATA", "__nl_symbol_pointer",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS);
if (IDVal == ".lazy_symbol_pointer")
return ParseDirectiveSectionSwitch("__DATA", "__la_symbol_pointer",
MCSectionMachO::S_LAZY_SYMBOL_POINTERS);
if (IDVal == ".dyld")
return ParseDirectiveSectionSwitch("__DATA", "__dyld", 0);
if (IDVal == ".mod_init_func")
return ParseDirectiveSectionSwitch("__DATA", "__mod_init_func",
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS);
if (IDVal == ".mod_term_func")
return ParseDirectiveSectionSwitch("__DATA", "__mod_term_func",
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS);
if (IDVal == ".const_data")
return ParseDirectiveSectionSwitch("__DATA", "__const", 0);
// FIXME: Verify attributes on sections.
if (IDVal == ".objc_class")
return ParseDirectiveSectionSwitch("__OBJC", "__class", 0);
if (IDVal == ".objc_meta_class")
return ParseDirectiveSectionSwitch("__OBJC", "__meta_class", 0);
if (IDVal == ".objc_cat_cls_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cat_cls_meth", 0);
if (IDVal == ".objc_cat_inst_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cat_inst_meth", 0);
if (IDVal == ".objc_protocol")
return ParseDirectiveSectionSwitch("__OBJC", "__protocol", 0);
if (IDVal == ".objc_string_object")
return ParseDirectiveSectionSwitch("__OBJC", "__string_object", 0);
if (IDVal == ".objc_cls_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cls_meth", 0);
if (IDVal == ".objc_inst_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__inst_meth", 0);
if (IDVal == ".objc_cls_refs")
return ParseDirectiveSectionSwitch("__OBJC", "__cls_refs", 0);
if (IDVal == ".objc_message_refs")
return ParseDirectiveSectionSwitch("__OBJC", "__message_refs", 0);
if (IDVal == ".objc_symbols")
return ParseDirectiveSectionSwitch("__OBJC", "__symbols", 0);
if (IDVal == ".objc_category")
return ParseDirectiveSectionSwitch("__OBJC", "__category", 0);
if (IDVal == ".objc_class_vars")
return ParseDirectiveSectionSwitch("__OBJC", "__class_vars", 0);
if (IDVal == ".objc_instance_vars")
return ParseDirectiveSectionSwitch("__OBJC", "__instance_vars", 0);
if (IDVal == ".objc_module_info")
return ParseDirectiveSectionSwitch("__OBJC", "__module_info", 0);
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", 0);
// Assembler features
if (IDVal == ".set")
return ParseDirectiveSet();
// Data directives
if (IDVal == ".ascii")
return ParseDirectiveAscii(false);
if (IDVal == ".asciz")
return ParseDirectiveAscii(true);
// FIXME: Target hooks for size? Also for "word", "hword".
if (IDVal == ".byte")
return ParseDirectiveValue(1);
if (IDVal == ".short" || IDVal == ".word")
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);
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, bool IsDotSet) {
// FIXME: Use better location, we should use proper tokens.
SMLoc EqualLoc = Lexer.getLoc();
MCValue Value;
if (ParseRelocatableExpression(Value))
return true;
if (Lexer.isNot(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: This doesn't diagnose assignment to a symbol which has been
// implicitly marked as external.
// FIXME: Handle '.'.
// FIXME: Diagnose assignment to protected identifier (e.g., register name).
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
if (Sym->getSection())
return Error(EqualLoc, "invalid assignment to symbol emitted as a label");
if (Sym->isExternal())
return Error(EqualLoc, "invalid assignment to external symbol");
// Do the assignment.
Out.EmitAssignment(Sym, Value, IsDotSet);
return false;
}
/// 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, true);
}
/// 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: CACHE THESE.
// FIXME: Arch specific.
MCSection *S = 0; //Ctx.GetSection(Section);
if (S == 0)
S = MCSectionMachO::Create(Segment, Section, TAA, StubSize,
SectionKind(), Ctx);
Out.SwitchSection(S);
return false;
}
/// ParseDirectiveSectionSwitch -
///
/// FIXME! Many of these directives implicitly cause a ".align" directive to get
/// emitted, we don't do this yet which can lead to subtle miscompiles.
bool AsmParser::ParseDirectiveSectionSwitch(const char *Segment,
const char *Section,
unsigned TAA, unsigned StubSize) {
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in section switching directive");
Lexer.Lex();
// FIXME: Arch specific.
// FIXME: Cache this!
MCSection *S = 0; // Ctx.GetSection(Section);
if (S == 0)
S = MCSectionMachO::Create(Segment, Section, TAA, StubSize,
SectionKind(), Ctx);
Out.SwitchSection(S);
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 (;;) {
MCValue Expr;
if (ParseRelocatableExpression(Expr))
return true;
Out.EmitValue(Expr, 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(MCValue::get(FillExpr), 1);
return false;
}
/// ParseDirectiveFill
/// ::= .fill expression , expression , expression
bool AsmParser::ParseDirectiveFill() {
int64_t NumValues;
if (ParseAbsoluteExpression(NumValues))
return true;
if (Lexer.isNot(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)
return TokError("invalid '.fill' size, expected 1, 2, or 4");
for (uint64_t i = 0, e = NumValues; i != e; ++i)
Out.EmitValue(MCValue::get(FillExpr), FillSize);
return false;
}
/// ParseDirectiveOrg
/// ::= .org expression [ , expression ]
bool AsmParser::ParseDirectiveOrg() {
MCValue Offset;
if (ParseRelocatableExpression(Offset))
return true;
// Parse optional fill expression.
int64_t FillExpr = 0;
if (Lexer.isNot(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) {
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.
Alignment = 1LL << Alignment;
}
// Diagnose non-sensical max bytes to fill.
if (MaxBytesLoc.isValid()) {
if (MaxBytesToFill < 1) {
Warning(MaxBytesLoc, "alignment directive can never be satisfied in this "
"many bytes, ignoring");
return false;
}
if (MaxBytesToFill >= Alignment) {
Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
"has no effect");
MaxBytesToFill = 0;
}
}
// FIXME: Target specific behavior about how the "extra" bytes are filled.
Out.EmitValueToAlignment(Alignment, FillExpr, ValueSize, MaxBytesToFill);
return false;
}
/// ParseDirectiveSymbolAttribute
/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
// If this is use of an undefined symbol then mark it external.
if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
Sym->setExternal(true);
Out.EmitSymbolAttribute(Sym, Attr);
if (Lexer.is(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 = Ctx.GetOrCreateSymbol(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 = Ctx.GetOrCreateSymbol(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");
// TODO: Symbol must be undefined or it is a error to re-defined the symbol
if (Sym->getSection() || Ctx.GetSymbolValue(Sym))
return Error(IDLoc, "invalid symbol redefinition");
// Create the Symbol as a common or local common with Size and Pow2Alignment
Out.EmitCommonSymbol(Sym, Size, Pow2Alignment, IsLocal);
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)) {
// FIXME: CACHE THIS.
MCSection *S = 0; //Ctx.GetSection(Section);
if (S == 0)
S = MCSectionMachO::Create(Segment, Section,
MCSectionMachO::S_ZEROFILL, 0,
SectionKind(), Ctx);
// Create the zerofill section but no symbol
Out.EmitZerofill(S);
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 = Ctx.GetOrCreateSymbol(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");
// TODO: Symbol must be undefined or it is a error to re-defined the symbol
if (Sym->getSection() || Ctx.GetSymbolValue(Sym))
return Error(IDLoc, "invalid symbol redefinition");
// FIXME: Arch specific.
// FIXME: CACHE.
MCSection *S = 0; //Ctx.GetSection(Section);
if (S == 0)
S = MCSectionMachO::Create(Segment, Section,
MCSectionMachO::S_ZEROFILL, 0,
SectionKind(), Ctx);
// Create the zerofill Symbol with Size and Pow2Alignment
Out.EmitZerofill(S, Sym, Size, 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 = Ctx.GetOrCreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.lsym' directive");
Lexer.Lex();
MCValue Expr;
if (ParseRelocatableExpression(Expr))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.lsym' directive");
Lexer.Lex();
// Create the Sym with the value of the Expr
Out.EmitLocalSymbol(Sym, Expr);
return false;
}
/// 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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