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llvm-mirror/tools/llvm-mc/AsmParser.cpp
Kevin Enderby f1c0daa6a7 Removed the DumpSymbolsandMacros and LoadSymbolsandMacros MCStreamer API as 
the parsing of the .dump and .load should be done in the assembly parser and
not have any need for an MCStreamer API.  Changed the code for now so these
just produce an error saying these specific directives are not yet implemented
since they are likely no longer used and may never need to be implemented.

llvm-svn: 76462
2009-07-20 20:25:37 +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/MC/MCContext.h"
#include "llvm/MC/MCInst.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 char *Msg) {
Lexer.PrintMessage(L, Msg, "warning");
}
bool AsmParser::Error(SMLoc L, const char *Msg) {
Lexer.PrintMessage(L, Msg, "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;
// While we have input, parse each statement.
while (Lexer.isNot(asmtok::Eof)) {
if (!ParseStatement()) continue;
// If we had an error, remember it and recover by skipping to the next line.
HadError = true;
EatToEndOfStatement();
}
return HadError;
}
/// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
void AsmParser::EatToEndOfStatement() {
while (Lexer.isNot(asmtok::EndOfStatement) &&
Lexer.isNot(asmtok::Eof))
Lexer.Lex();
// Eat EOL.
if (Lexer.is(asmtok::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(asmtok::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 asmtok::Exclaim:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = new AsmUnaryExpr(AsmUnaryExpr::LNot, Res);
return false;
case asmtok::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.getCurStrVal());
// 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 asmtok::IntVal:
Res = new AsmConstantExpr(Lexer.getCurIntVal());
Lexer.Lex(); // Eat identifier.
return false;
case asmtok::LParen:
Lexer.Lex(); // Eat the '('.
return ParseParenExpr(Res);
case asmtok::Minus:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = new AsmUnaryExpr(AsmUnaryExpr::Minus, Res);
return false;
case asmtok::Plus:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
Res = new AsmUnaryExpr(AsmUnaryExpr::Plus, Res);
return false;
case asmtok::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(asmtok::TokKind K,
AsmBinaryExpr::Opcode &Kind) {
switch (K) {
default: return 0; // not a binop.
// Lowest Precedence: &&, ||
case asmtok::AmpAmp:
Kind = AsmBinaryExpr::LAnd;
return 1;
case asmtok::PipePipe:
Kind = AsmBinaryExpr::LOr;
return 1;
// Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
case asmtok::Plus:
Kind = AsmBinaryExpr::Add;
return 2;
case asmtok::Minus:
Kind = AsmBinaryExpr::Sub;
return 2;
case asmtok::EqualEqual:
Kind = AsmBinaryExpr::EQ;
return 2;
case asmtok::ExclaimEqual:
case asmtok::LessGreater:
Kind = AsmBinaryExpr::NE;
return 2;
case asmtok::Less:
Kind = AsmBinaryExpr::LT;
return 2;
case asmtok::LessEqual:
Kind = AsmBinaryExpr::LTE;
return 2;
case asmtok::Greater:
Kind = AsmBinaryExpr::GT;
return 2;
case asmtok::GreaterEqual:
Kind = AsmBinaryExpr::GTE;
return 2;
// Intermediate Precedence: |, &, ^
//
// FIXME: gas seems to support '!' as an infix operator?
case asmtok::Pipe:
Kind = AsmBinaryExpr::Or;
return 3;
case asmtok::Caret:
Kind = AsmBinaryExpr::Xor;
return 3;
case asmtok::Amp:
Kind = AsmBinaryExpr::And;
return 3;
// Highest Precedence: *, /, %, <<, >>
case asmtok::Star:
Kind = AsmBinaryExpr::Mul;
return 4;
case asmtok::Slash:
Kind = AsmBinaryExpr::Div;
return 4;
case asmtok::Percent:
Kind = AsmBinaryExpr::Mod;
return 4;
case asmtok::LessLess:
Kind = AsmBinaryExpr::Shl;
return 4;
case asmtok::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() {
switch (Lexer.getKind()) {
default:
return TokError("unexpected token at start of statement");
case asmtok::EndOfStatement:
Lexer.Lex();
return false;
case asmtok::Identifier:
break;
// TODO: Recurse on local labels etc.
}
// If we have an identifier, handle it as the key symbol.
SMLoc IDLoc = Lexer.getLoc();
const char *IDVal = Lexer.getCurStrVal();
// Consume the identifier, see what is after it.
switch (Lexer.Lex()) {
case asmtok::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 asmtok::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 (!strcmp(IDVal, ".section"))
return ParseDirectiveDarwinSection();
if (!strcmp(IDVal, ".text"))
// FIXME: This changes behavior based on the -static flag to the
// assembler.
return ParseDirectiveSectionSwitch("__TEXT,__text",
"regular,pure_instructions");
if (!strcmp(IDVal, ".const"))
return ParseDirectiveSectionSwitch("__TEXT,__const");
if (!strcmp(IDVal, ".static_const"))
return ParseDirectiveSectionSwitch("__TEXT,__static_const");
if (!strcmp(IDVal, ".cstring"))
return ParseDirectiveSectionSwitch("__TEXT,__cstring",
"cstring_literals");
if (!strcmp(IDVal, ".literal4"))
return ParseDirectiveSectionSwitch("__TEXT,__literal4", "4byte_literals");
if (!strcmp(IDVal, ".literal8"))
return ParseDirectiveSectionSwitch("__TEXT,__literal8", "8byte_literals");
if (!strcmp(IDVal, ".literal16"))
return ParseDirectiveSectionSwitch("__TEXT,__literal16",
"16byte_literals");
if (!strcmp(IDVal, ".constructor"))
return ParseDirectiveSectionSwitch("__TEXT,__constructor");
if (!strcmp(IDVal, ".destructor"))
return ParseDirectiveSectionSwitch("__TEXT,__destructor");
if (!strcmp(IDVal, ".fvmlib_init0"))
return ParseDirectiveSectionSwitch("__TEXT,__fvmlib_init0");
if (!strcmp(IDVal, ".fvmlib_init1"))
return ParseDirectiveSectionSwitch("__TEXT,__fvmlib_init1");
if (!strcmp(IDVal, ".symbol_stub")) // FIXME: Different on PPC.
return ParseDirectiveSectionSwitch("__IMPORT,__jump_table,symbol_stubs",
"self_modifying_code+pure_instructions,5");
// FIXME: .picsymbol_stub on PPC.
if (!strcmp(IDVal, ".data"))
return ParseDirectiveSectionSwitch("__DATA,__data");
if (!strcmp(IDVal, ".static_data"))
return ParseDirectiveSectionSwitch("__DATA,__static_data");
if (!strcmp(IDVal, ".non_lazy_symbol_pointer"))
return ParseDirectiveSectionSwitch("__DATA,__nl_symbol_pointer",
"non_lazy_symbol_pointers");
if (!strcmp(IDVal, ".lazy_symbol_pointer"))
return ParseDirectiveSectionSwitch("__DATA,__la_symbol_pointer",
"lazy_symbol_pointers");
if (!strcmp(IDVal, ".dyld"))
return ParseDirectiveSectionSwitch("__DATA,__dyld");
if (!strcmp(IDVal, ".mod_init_func"))
return ParseDirectiveSectionSwitch("__DATA,__mod_init_func",
"mod_init_funcs");
if (!strcmp(IDVal, ".mod_term_func"))
return ParseDirectiveSectionSwitch("__DATA,__mod_term_func",
"mod_term_funcs");
if (!strcmp(IDVal, ".const_data"))
return ParseDirectiveSectionSwitch("__DATA,__const", "regular");
// FIXME: Verify attributes on sections.
if (!strcmp(IDVal, ".objc_class"))
return ParseDirectiveSectionSwitch("__OBJC,__class");
if (!strcmp(IDVal, ".objc_meta_class"))
return ParseDirectiveSectionSwitch("__OBJC,__meta_class");
if (!strcmp(IDVal, ".objc_cat_cls_meth"))
return ParseDirectiveSectionSwitch("__OBJC,__cat_cls_meth");
if (!strcmp(IDVal, ".objc_cat_inst_meth"))
return ParseDirectiveSectionSwitch("__OBJC,__cat_inst_meth");
if (!strcmp(IDVal, ".objc_protocol"))
return ParseDirectiveSectionSwitch("__OBJC,__protocol");
if (!strcmp(IDVal, ".objc_string_object"))
return ParseDirectiveSectionSwitch("__OBJC,__string_object");
if (!strcmp(IDVal, ".objc_cls_meth"))
return ParseDirectiveSectionSwitch("__OBJC,__cls_meth");
if (!strcmp(IDVal, ".objc_inst_meth"))
return ParseDirectiveSectionSwitch("__OBJC,__inst_meth");
if (!strcmp(IDVal, ".objc_cls_refs"))
return ParseDirectiveSectionSwitch("__OBJC,__cls_refs");
if (!strcmp(IDVal, ".objc_message_refs"))
return ParseDirectiveSectionSwitch("__OBJC,__message_refs");
if (!strcmp(IDVal, ".objc_symbols"))
return ParseDirectiveSectionSwitch("__OBJC,__symbols");
if (!strcmp(IDVal, ".objc_category"))
return ParseDirectiveSectionSwitch("__OBJC,__category");
if (!strcmp(IDVal, ".objc_class_vars"))
return ParseDirectiveSectionSwitch("__OBJC,__class_vars");
if (!strcmp(IDVal, ".objc_instance_vars"))
return ParseDirectiveSectionSwitch("__OBJC,__instance_vars");
if (!strcmp(IDVal, ".objc_module_info"))
return ParseDirectiveSectionSwitch("__OBJC,__module_info");
if (!strcmp(IDVal, ".objc_class_names"))
return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
if (!strcmp(IDVal, ".objc_meth_var_types"))
return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
if (!strcmp(IDVal, ".objc_meth_var_names"))
return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
if (!strcmp(IDVal, ".objc_selector_strs"))
return ParseDirectiveSectionSwitch("__OBJC,__selector_strs");
// Assembler features
if (!strcmp(IDVal, ".set"))
return ParseDirectiveSet();
// Data directives
if (!strcmp(IDVal, ".ascii"))
return ParseDirectiveAscii(false);
if (!strcmp(IDVal, ".asciz"))
return ParseDirectiveAscii(true);
// FIXME: Target hooks for size? Also for "word", "hword".
if (!strcmp(IDVal, ".byte"))
return ParseDirectiveValue(1);
if (!strcmp(IDVal, ".short"))
return ParseDirectiveValue(2);
if (!strcmp(IDVal, ".long"))
return ParseDirectiveValue(4);
if (!strcmp(IDVal, ".quad"))
return ParseDirectiveValue(8);
// FIXME: Target hooks for IsPow2.
if (!strcmp(IDVal, ".align"))
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
if (!strcmp(IDVal, ".align32"))
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
if (!strcmp(IDVal, ".balign"))
return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
if (!strcmp(IDVal, ".balignw"))
return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
if (!strcmp(IDVal, ".balignl"))
return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
if (!strcmp(IDVal, ".p2align"))
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
if (!strcmp(IDVal, ".p2alignw"))
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
if (!strcmp(IDVal, ".p2alignl"))
return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
if (!strcmp(IDVal, ".org"))
return ParseDirectiveOrg();
if (!strcmp(IDVal, ".fill"))
return ParseDirectiveFill();
if (!strcmp(IDVal, ".space"))
return ParseDirectiveSpace();
// Symbol attribute directives
if (!strcmp(IDVal, ".globl") || !strcmp(IDVal, ".global"))
return ParseDirectiveSymbolAttribute(MCStreamer::Global);
if (!strcmp(IDVal, ".hidden"))
return ParseDirectiveSymbolAttribute(MCStreamer::Hidden);
if (!strcmp(IDVal, ".indirect_symbol"))
return ParseDirectiveSymbolAttribute(MCStreamer::IndirectSymbol);
if (!strcmp(IDVal, ".internal"))
return ParseDirectiveSymbolAttribute(MCStreamer::Internal);
if (!strcmp(IDVal, ".lazy_reference"))
return ParseDirectiveSymbolAttribute(MCStreamer::LazyReference);
if (!strcmp(IDVal, ".no_dead_strip"))
return ParseDirectiveSymbolAttribute(MCStreamer::NoDeadStrip);
if (!strcmp(IDVal, ".private_extern"))
return ParseDirectiveSymbolAttribute(MCStreamer::PrivateExtern);
if (!strcmp(IDVal, ".protected"))
return ParseDirectiveSymbolAttribute(MCStreamer::Protected);
if (!strcmp(IDVal, ".reference"))
return ParseDirectiveSymbolAttribute(MCStreamer::Reference);
if (!strcmp(IDVal, ".weak"))
return ParseDirectiveSymbolAttribute(MCStreamer::Weak);
if (!strcmp(IDVal, ".weak_definition"))
return ParseDirectiveSymbolAttribute(MCStreamer::WeakDefinition);
if (!strcmp(IDVal, ".weak_reference"))
return ParseDirectiveSymbolAttribute(MCStreamer::WeakReference);
if (!strcmp(IDVal, ".comm"))
return ParseDirectiveComm(/*IsLocal=*/false);
if (!strcmp(IDVal, ".lcomm"))
return ParseDirectiveComm(/*IsLocal=*/true);
if (!strcmp(IDVal, ".zerofill"))
return ParseDirectiveDarwinZerofill();
if (!strcmp(IDVal, ".desc"))
return ParseDirectiveDarwinSymbolDesc();
if (!strcmp(IDVal, ".lsym"))
return ParseDirectiveDarwinLsym();
if (!strcmp(IDVal, ".subsections_via_symbols"))
return ParseDirectiveDarwinSubsectionsViaSymbols();
if (!strcmp(IDVal, ".abort"))
return ParseDirectiveAbort();
if (!strcmp(IDVal, ".include"))
return ParseDirectiveInclude();
if (!strcmp(IDVal, ".dump"))
return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsDump=*/true);
if (!strcmp(IDVal, ".load"))
return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsLoad=*/false);
Warning(IDLoc, "ignoring directive for now");
EatToEndOfStatement();
return false;
}
MCInst Inst;
if (ParseX86InstOperands(IDVal, Inst) &&
getTargetParser().ParseInstruction(*this, IDVal, Inst))
return true;
if (Lexer.isNot(asmtok::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 char *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(asmtok::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;
}
/// ParseDirectiveSet:
/// ::= .set identifier ',' expression
bool AsmParser::ParseDirectiveSet() {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier after '.set' directive");
const char *Name = Lexer.getCurStrVal();
if (Lexer.Lex() != asmtok::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() {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier after '.section' directive");
std::string Section = Lexer.getCurStrVal();
Lexer.Lex();
// Accept a comma separated list of modifiers.
while (Lexer.is(asmtok::Comma)) {
Lexer.Lex();
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in '.section' directive");
Section += ',';
Section += Lexer.getCurStrVal();
Lexer.Lex();
}
if (Lexer.isNot(asmtok::EndOfStatement))
return TokError("unexpected token in '.section' directive");
Lexer.Lex();
Out.SwitchSection(Ctx.GetSection(Section.c_str()));
return false;
}
bool AsmParser::ParseDirectiveSectionSwitch(const char *Section,
const char *Directives) {
if (Lexer.isNot(asmtok::EndOfStatement))
return TokError("unexpected token in section switching directive");
Lexer.Lex();
std::string SectionStr = Section;
if (Directives && Directives[0]) {
SectionStr += ",";
SectionStr += Directives;
}
Out.SwitchSection(Ctx.GetSection(Section));
return false;
}
/// ParseDirectiveAscii:
/// ::= ( .ascii | .asciz ) [ "string" ( , "string" )* ]
bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
if (Lexer.isNot(asmtok::EndOfStatement)) {
for (;;) {
if (Lexer.isNot(asmtok::String))
return TokError("expected string in '.ascii' or '.asciz' directive");
// FIXME: This shouldn't use a const char* + strlen, the string could have
// embedded nulls.
// FIXME: Should have accessor for getting string contents.
const char *Str = Lexer.getCurStrVal();
Out.EmitBytes(Str + 1, strlen(Str) - 2);
if (ZeroTerminated)
Out.EmitBytes("\0", 1);
Lexer.Lex();
if (Lexer.is(asmtok::EndOfStatement))
break;
if (Lexer.isNot(asmtok::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(asmtok::EndOfStatement)) {
for (;;) {
MCValue Expr;
if (ParseRelocatableExpression(Expr))
return true;
Out.EmitValue(Expr, Size);
if (Lexer.is(asmtok::EndOfStatement))
break;
// FIXME: Improve diagnostic.
if (Lexer.isNot(asmtok::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(asmtok::EndOfStatement)) {
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in '.space' directive");
Lexer.Lex();
if (ParseAbsoluteExpression(FillExpr))
return true;
HasFillExpr = true;
if (Lexer.isNot(asmtok::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(asmtok::Comma))
return TokError("unexpected token in '.fill' directive");
Lexer.Lex();
int64_t FillSize;
if (ParseAbsoluteExpression(FillSize))
return true;
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in '.fill' directive");
Lexer.Lex();
int64_t FillExpr;
if (ParseAbsoluteExpression(FillExpr))
return true;
if (Lexer.isNot(asmtok::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(asmtok::EndOfStatement)) {
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in '.org' directive");
Lexer.Lex();
if (ParseAbsoluteExpression(FillExpr))
return true;
if (Lexer.isNot(asmtok::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(asmtok::EndOfStatement)) {
if (Lexer.isNot(asmtok::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(asmtok::Comma)) {
HasFillExpr = true;
if (ParseAbsoluteExpression(FillExpr))
return true;
}
if (Lexer.isNot(asmtok::EndOfStatement)) {
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
MaxBytesLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(MaxBytesToFill))
return true;
if (Lexer.isNot(asmtok::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(asmtok::EndOfStatement)) {
for (;;) {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in directive");
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
Lexer.Lex();
// 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(asmtok::EndOfStatement))
break;
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
}
}
Lexer.Lex();
return false;
}
/// ParseDirectiveDarwinSymbolDesc
/// ::= .desc identifier , expression
bool AsmParser::ParseDirectiveDarwinSymbolDesc() {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in directive");
// handle the identifier as the key symbol.
SMLoc IDLoc = Lexer.getLoc();
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
Lexer.Lex();
if (Lexer.isNot(asmtok::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(asmtok::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) {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in directive");
// handle the identifier as the key symbol.
SMLoc IDLoc = Lexer.getLoc();
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
Lexer.Lex();
if (Lexer.isNot(asmtok::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(asmtok::Comma)) {
Lexer.Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(asmtok::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() {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected segment name after '.zerofill' directive");
std::string Section = Lexer.getCurStrVal();
Lexer.Lex();
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in directive");
Section += ',';
Lexer.Lex();
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected section name after comma in '.zerofill' "
"directive");
Section += Lexer.getCurStrVal();
Lexer.Lex();
// FIXME: we will need to tell GetSection() that this is to be created with or
// must have the Mach-O section type of S_ZEROFILL. Something like the code
// below could be done but for now it is not as EmitZerofill() does not know
// how to deal with a section type in the section name like
// ParseDirectiveDarwinSection() allows.
// Section += ',';
// Section += "zerofill";
// 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(asmtok::EndOfStatement)) {
// Create the zerofill section but no symbol
Out.EmitZerofill(Ctx.GetSection(Section.c_str()));
return false;
}
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in directive");
Lexer.Lex();
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in directive");
// handle the identifier as the key symbol.
SMLoc IDLoc = Lexer.getLoc();
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
Lexer.Lex();
if (Lexer.isNot(asmtok::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(asmtok::Comma)) {
Lexer.Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(asmtok::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");
// Create the zerofill Symbol with Size and Pow2Alignment
Out.EmitZerofill(Ctx.GetSection(Section.c_str()), Sym, Size, Pow2Alignment);
return false;
}
/// ParseDirectiveDarwinSubsectionsViaSymbols
/// ::= .subsections_via_symbols
bool AsmParser::ParseDirectiveDarwinSubsectionsViaSymbols() {
if (Lexer.isNot(asmtok::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() {
const char *Str = NULL;
if (Lexer.isNot(asmtok::EndOfStatement)) {
if (Lexer.isNot(asmtok::String))
return TokError("expected string in '.abort' directive");
Str = Lexer.getCurStrVal();
Lexer.Lex();
}
if (Lexer.isNot(asmtok::EndOfStatement))
return TokError("unexpected token in '.abort' directive");
Lexer.Lex();
Out.AbortAssembly(Str);
return false;
}
/// ParseDirectiveLsym
/// ::= .lsym identifier , expression
bool AsmParser::ParseDirectiveDarwinLsym() {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in directive");
// handle the identifier as the key symbol.
SMLoc IDLoc = Lexer.getLoc();
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
Lexer.Lex();
if (Lexer.isNot(asmtok::Comma))
return TokError("unexpected token in '.lsym' directive");
Lexer.Lex();
MCValue Expr;
if (ParseRelocatableExpression(Expr))
return true;
if (Lexer.isNot(asmtok::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(asmtok::String))
return TokError("expected string in '.include' directive");
std::string Filename = Lexer.getCurStrVal();
SMLoc IncludeLoc = Lexer.getLoc();
Lexer.Lex();
if (Lexer.isNot(asmtok::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(asmtok::String))
return TokError("expected string in '.dump' or '.load' directive");
Lexer.getCurStrVal();
Lexer.Lex();
if (Lexer.isNot(asmtok::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;
}
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