mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-01 04:29:57 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84233 91177308-0d34-0410-b5e6-96231b3b80d8
1704 lines
52 KiB
C++
1704 lines
52 KiB
C++
//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements the parser for assembly files.
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//
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//===----------------------------------------------------------------------===//
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#include "AsmParser.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetAsmParser.h"
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using namespace llvm;
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// Mach-O section uniquing.
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//
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// FIXME: Figure out where this should live, it should be shared by
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// TargetLoweringObjectFile.
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typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
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AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
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const MCAsmInfo &_MAI)
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: Lexer(_SM, _MAI), Ctx(_Ctx), Out(_Out), TargetParser(0),
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SectionUniquingMap(0) {
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// Debugging directives.
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AddDirectiveHandler(".file", &AsmParser::ParseDirectiveFile);
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AddDirectiveHandler(".line", &AsmParser::ParseDirectiveLine);
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AddDirectiveHandler(".loc", &AsmParser::ParseDirectiveLoc);
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}
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AsmParser::~AsmParser() {
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// If we have the MachO uniquing map, free it.
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delete (MachOUniqueMapTy*)SectionUniquingMap;
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}
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const MCSection *AsmParser::getMachOSection(const StringRef &Segment,
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const StringRef &Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2,
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SectionKind Kind) const {
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// We unique sections by their segment/section pair. The returned section
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// may not have the same flags as the requested section, if so this should be
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// diagnosed by the client as an error.
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// Create the map if it doesn't already exist.
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if (SectionUniquingMap == 0)
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SectionUniquingMap = new MachOUniqueMapTy();
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MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)SectionUniquingMap;
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// Form the name to look up.
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SmallString<64> Name;
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Name += Segment;
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Name.push_back(',');
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Name += Section;
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// Do the lookup, if we have a hit, return it.
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const MCSectionMachO *&Entry = Map[Name.str()];
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// FIXME: This should validate the type and attributes.
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if (Entry) return Entry;
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// Otherwise, return a new section.
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return Entry = MCSectionMachO::Create(Segment, Section, TypeAndAttributes,
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Reserved2, Kind, Ctx);
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}
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void AsmParser::Warning(SMLoc L, const Twine &Msg) {
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Lexer.PrintMessage(L, Msg.str(), "warning");
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}
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bool AsmParser::Error(SMLoc L, const Twine &Msg) {
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Lexer.PrintMessage(L, Msg.str(), "error");
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return true;
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}
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bool AsmParser::TokError(const char *Msg) {
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Lexer.PrintMessage(Lexer.getLoc(), Msg, "error");
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return true;
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}
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bool AsmParser::Run() {
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// Create the initial section.
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//
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// FIXME: Support -n.
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// FIXME: Target hook & command line option for initial section.
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Out.SwitchSection(getMachOSection("__TEXT", "__text",
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
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0, SectionKind()));
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// Prime the lexer.
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Lexer.Lex();
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bool HadError = false;
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AsmCond StartingCondState = TheCondState;
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// While we have input, parse each statement.
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while (Lexer.isNot(AsmToken::Eof)) {
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// Handle conditional assembly here before calling ParseStatement()
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if (Lexer.getKind() == AsmToken::Identifier) {
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// If we have an identifier, handle it as the key symbol.
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AsmToken ID = Lexer.getTok();
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SMLoc IDLoc = ID.getLoc();
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StringRef IDVal = ID.getString();
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if (IDVal == ".if" ||
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IDVal == ".elseif" ||
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IDVal == ".else" ||
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IDVal == ".endif") {
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if (!ParseConditionalAssemblyDirectives(IDVal, IDLoc))
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continue;
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HadError = true;
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EatToEndOfStatement();
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continue;
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}
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}
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if (TheCondState.Ignore) {
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EatToEndOfStatement();
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continue;
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}
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if (!ParseStatement()) continue;
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// We had an error, remember it and recover by skipping to the next line.
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HadError = true;
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EatToEndOfStatement();
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}
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if (TheCondState.TheCond != StartingCondState.TheCond ||
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TheCondState.Ignore != StartingCondState.Ignore)
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return TokError("unmatched .ifs or .elses");
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if (!HadError)
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Out.Finish();
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return HadError;
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}
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/// ParseConditionalAssemblyDirectives - parse the conditional assembly
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/// directives
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bool AsmParser::ParseConditionalAssemblyDirectives(StringRef Directive,
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SMLoc DirectiveLoc) {
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if (Directive == ".if")
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return ParseDirectiveIf(DirectiveLoc);
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if (Directive == ".elseif")
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return ParseDirectiveElseIf(DirectiveLoc);
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if (Directive == ".else")
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return ParseDirectiveElse(DirectiveLoc);
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if (Directive == ".endif")
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return ParseDirectiveEndIf(DirectiveLoc);
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return true;
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}
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/// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
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void AsmParser::EatToEndOfStatement() {
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while (Lexer.isNot(AsmToken::EndOfStatement) &&
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Lexer.isNot(AsmToken::Eof))
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Lexer.Lex();
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// Eat EOL.
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if (Lexer.is(AsmToken::EndOfStatement))
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Lexer.Lex();
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}
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/// ParseParenExpr - Parse a paren expression and return it.
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/// NOTE: This assumes the leading '(' has already been consumed.
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///
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/// parenexpr ::= expr)
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///
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bool AsmParser::ParseParenExpr(const MCExpr *&Res) {
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if (ParseExpression(Res)) return true;
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if (Lexer.isNot(AsmToken::RParen))
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return TokError("expected ')' in parentheses expression");
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Lexer.Lex();
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return false;
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}
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MCSymbol *AsmParser::CreateSymbol(StringRef Name) {
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if (MCSymbol *S = Ctx.LookupSymbol(Name))
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return S;
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// If the label starts with L it is an assembler temporary label.
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if (Name.startswith("L"))
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return Ctx.CreateTemporarySymbol(Name);
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return Ctx.CreateSymbol(Name);
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}
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/// ParsePrimaryExpr - Parse a primary expression and return it.
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/// primaryexpr ::= (parenexpr
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/// primaryexpr ::= symbol
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/// primaryexpr ::= number
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/// primaryexpr ::= ~,+,- primaryexpr
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bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res) {
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switch (Lexer.getKind()) {
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default:
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return TokError("unknown token in expression");
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case AsmToken::Exclaim:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = MCUnaryExpr::CreateLNot(Res, getContext());
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return false;
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case AsmToken::String:
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case AsmToken::Identifier: {
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// This is a symbol reference.
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MCSymbol *Sym = CreateSymbol(Lexer.getTok().getIdentifier());
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Lexer.Lex(); // Eat identifier.
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// If this is an absolute variable reference, substitute it now to preserve
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// semantics in the face of reassignment.
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if (Sym->getValue() && isa<MCConstantExpr>(Sym->getValue())) {
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Res = Sym->getValue();
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return false;
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}
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// Otherwise create a symbol ref.
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Res = MCSymbolRefExpr::Create(Sym, getContext());
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return false;
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}
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case AsmToken::Integer:
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Res = MCConstantExpr::Create(Lexer.getTok().getIntVal(), getContext());
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Lexer.Lex(); // Eat token.
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return false;
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case AsmToken::LParen:
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Lexer.Lex(); // Eat the '('.
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return ParseParenExpr(Res);
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case AsmToken::Minus:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = MCUnaryExpr::CreateMinus(Res, getContext());
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return false;
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case AsmToken::Plus:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = MCUnaryExpr::CreatePlus(Res, getContext());
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return false;
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case AsmToken::Tilde:
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Lexer.Lex(); // Eat the operator.
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if (ParsePrimaryExpr(Res))
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return true;
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Res = MCUnaryExpr::CreateNot(Res, getContext());
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return false;
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}
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}
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/// ParseExpression - Parse an expression and return it.
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///
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/// expr ::= expr +,- expr -> lowest.
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/// expr ::= expr |,^,&,! expr -> middle.
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/// expr ::= expr *,/,%,<<,>> expr -> highest.
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/// expr ::= primaryexpr
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///
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bool AsmParser::ParseExpression(const MCExpr *&Res) {
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Res = 0;
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return ParsePrimaryExpr(Res) ||
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ParseBinOpRHS(1, Res);
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}
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bool AsmParser::ParseParenExpression(const MCExpr *&Res) {
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if (ParseParenExpr(Res))
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return true;
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return false;
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}
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bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
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const MCExpr *Expr;
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SMLoc StartLoc = Lexer.getLoc();
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if (ParseExpression(Expr))
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return true;
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if (!Expr->EvaluateAsAbsolute(Res))
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return Error(StartLoc, "expected absolute expression");
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return false;
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}
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static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
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MCBinaryExpr::Opcode &Kind) {
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switch (K) {
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default:
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return 0; // not a binop.
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// Lowest Precedence: &&, ||
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case AsmToken::AmpAmp:
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Kind = MCBinaryExpr::LAnd;
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return 1;
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case AsmToken::PipePipe:
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Kind = MCBinaryExpr::LOr;
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return 1;
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// Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
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case AsmToken::Plus:
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Kind = MCBinaryExpr::Add;
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return 2;
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case AsmToken::Minus:
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Kind = MCBinaryExpr::Sub;
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return 2;
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case AsmToken::EqualEqual:
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Kind = MCBinaryExpr::EQ;
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return 2;
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case AsmToken::ExclaimEqual:
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case AsmToken::LessGreater:
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Kind = MCBinaryExpr::NE;
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return 2;
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case AsmToken::Less:
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Kind = MCBinaryExpr::LT;
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return 2;
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case AsmToken::LessEqual:
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Kind = MCBinaryExpr::LTE;
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return 2;
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case AsmToken::Greater:
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Kind = MCBinaryExpr::GT;
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return 2;
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case AsmToken::GreaterEqual:
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Kind = MCBinaryExpr::GTE;
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return 2;
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// Intermediate Precedence: |, &, ^
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//
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// FIXME: gas seems to support '!' as an infix operator?
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case AsmToken::Pipe:
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Kind = MCBinaryExpr::Or;
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return 3;
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case AsmToken::Caret:
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Kind = MCBinaryExpr::Xor;
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return 3;
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case AsmToken::Amp:
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Kind = MCBinaryExpr::And;
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return 3;
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// Highest Precedence: *, /, %, <<, >>
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case AsmToken::Star:
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Kind = MCBinaryExpr::Mul;
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return 4;
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case AsmToken::Slash:
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Kind = MCBinaryExpr::Div;
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return 4;
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case AsmToken::Percent:
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Kind = MCBinaryExpr::Mod;
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return 4;
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case AsmToken::LessLess:
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Kind = MCBinaryExpr::Shl;
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return 4;
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case AsmToken::GreaterGreater:
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Kind = MCBinaryExpr::Shr;
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return 4;
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}
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}
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/// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
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/// Res contains the LHS of the expression on input.
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bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res) {
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while (1) {
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MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
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unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
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// If the next token is lower precedence than we are allowed to eat, return
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// successfully with what we ate already.
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if (TokPrec < Precedence)
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return false;
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Lexer.Lex();
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// Eat the next primary expression.
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const MCExpr *RHS;
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if (ParsePrimaryExpr(RHS)) return true;
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// If BinOp binds less tightly with RHS than the operator after RHS, let
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// the pending operator take RHS as its LHS.
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MCBinaryExpr::Opcode Dummy;
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unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
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if (TokPrec < NextTokPrec) {
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if (ParseBinOpRHS(Precedence+1, RHS)) return true;
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}
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// Merge LHS and RHS according to operator.
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Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
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}
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}
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/// ParseStatement:
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/// ::= EndOfStatement
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/// ::= Label* Directive ...Operands... EndOfStatement
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/// ::= Label* Identifier OperandList* EndOfStatement
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bool AsmParser::ParseStatement() {
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if (Lexer.is(AsmToken::EndOfStatement)) {
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Lexer.Lex();
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return false;
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}
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// Statements always start with an identifier.
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AsmToken ID = Lexer.getTok();
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SMLoc IDLoc = ID.getLoc();
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StringRef IDVal;
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if (ParseIdentifier(IDVal))
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return TokError("unexpected token at start of statement");
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// FIXME: Recurse on local labels?
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// See what kind of statement we have.
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switch (Lexer.getKind()) {
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case AsmToken::Colon: {
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// identifier ':' -> Label.
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Lexer.Lex();
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// Diagnose attempt to use a variable as a label.
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//
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// FIXME: Diagnostics. Note the location of the definition as a label.
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// FIXME: This doesn't diagnose assignment to a symbol which has been
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// implicitly marked as external.
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MCSymbol *Sym = CreateSymbol(IDVal);
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if (!Sym->isUndefined())
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return Error(IDLoc, "invalid symbol redefinition");
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// Emit the label.
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Out.EmitLabel(Sym);
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return ParseStatement();
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}
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case AsmToken::Equal:
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// identifier '=' ... -> assignment statement
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Lexer.Lex();
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return ParseAssignment(IDVal);
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default: // Normal instruction or directive.
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break;
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}
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// Otherwise, we have a normal instruction or directive.
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if (IDVal[0] == '.') {
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// FIXME: This should be driven based on a hash lookup and callback.
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if (IDVal == ".section")
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return ParseDirectiveDarwinSection();
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if (IDVal == ".text")
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// FIXME: This changes behavior based on the -static flag to the
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// assembler.
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return ParseDirectiveSectionSwitch("__TEXT", "__text",
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
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if (IDVal == ".const")
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return ParseDirectiveSectionSwitch("__TEXT", "__const");
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if (IDVal == ".static_const")
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return ParseDirectiveSectionSwitch("__TEXT", "__static_const");
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if (IDVal == ".cstring")
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return ParseDirectiveSectionSwitch("__TEXT","__cstring",
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MCSectionMachO::S_CSTRING_LITERALS);
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if (IDVal == ".literal4")
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return ParseDirectiveSectionSwitch("__TEXT", "__literal4",
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MCSectionMachO::S_4BYTE_LITERALS,
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4);
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if (IDVal == ".literal8")
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return ParseDirectiveSectionSwitch("__TEXT", "__literal8",
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MCSectionMachO::S_8BYTE_LITERALS,
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8);
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if (IDVal == ".literal16")
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return ParseDirectiveSectionSwitch("__TEXT","__literal16",
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MCSectionMachO::S_16BYTE_LITERALS,
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16);
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if (IDVal == ".constructor")
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return ParseDirectiveSectionSwitch("__TEXT","__constructor");
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if (IDVal == ".destructor")
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return ParseDirectiveSectionSwitch("__TEXT","__destructor");
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if (IDVal == ".fvmlib_init0")
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return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init0");
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if (IDVal == ".fvmlib_init1")
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return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init1");
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// FIXME: The assembler manual claims that this has the self modify code
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// flag, at least on x86-32, but that does not appear to be correct.
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if (IDVal == ".symbol_stub")
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return ParseDirectiveSectionSwitch("__TEXT","__symbol_stub",
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MCSectionMachO::S_SYMBOL_STUBS |
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
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// FIXME: Different on PPC and ARM.
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0, 16);
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// FIXME: PowerPC only?
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if (IDVal == ".picsymbol_stub")
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return ParseDirectiveSectionSwitch("__TEXT","__picsymbol_stub",
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MCSectionMachO::S_SYMBOL_STUBS |
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
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0, 26);
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if (IDVal == ".data")
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return ParseDirectiveSectionSwitch("__DATA", "__data");
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if (IDVal == ".static_data")
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return ParseDirectiveSectionSwitch("__DATA", "__static_data");
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// FIXME: The section names of these two are misspelled in the assembler
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// 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);
|
|
|
|
// Look up the handler in the handler table,
|
|
bool(AsmParser::*Handler)(StringRef, SMLoc) = DirectiveMap[IDVal];
|
|
if (Handler)
|
|
return (this->*Handler)(IDVal, 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();
|
|
|
|
// Validate that the LHS is allowed to be a variable (either it has not been
|
|
// used as a symbol, or it is an absolute symbol).
|
|
MCSymbol *Sym = getContext().LookupSymbol(Name);
|
|
if (Sym) {
|
|
// Diagnose assignment to a label.
|
|
//
|
|
// FIXME: Diagnostics. Note the location of the definition as a label.
|
|
// FIXME: Diagnose assignment to protected identifier (e.g., register name).
|
|
if (!Sym->isUndefined() && !Sym->isAbsolute())
|
|
return Error(EqualLoc, "redefinition of '" + Name + "'");
|
|
else if (!Sym->isVariable())
|
|
return Error(EqualLoc, "invalid assignment to '" + Name + "'");
|
|
else if (!isa<MCConstantExpr>(Sym->getValue()))
|
|
return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
|
|
Name + "'");
|
|
} else
|
|
Sym = CreateSymbol(Name);
|
|
|
|
// FIXME: Handle '.'.
|
|
|
|
// 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(StringRef, 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(StringRef, 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(StringRef, 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;
|
|
}
|
|
|