LLVM  8.0.1
Public Types | Public Member Functions | Protected Member Functions | List of all members
llvm::MCExpr Class Reference

Base class for the full range of assembler expressions which are needed for parsing. More...

#include "llvm/MC/MCExpr.h"

Inheritance diagram for llvm::MCExpr:
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Public Types

enum  ExprKind {
  Binary, Constant, SymbolRef, Unary,
  Target
}
 

Public Member Functions

 MCExpr (const MCExpr &)=delete
 
MCExpr & operator= (const MCExpr &)=delete
 
Accessors
ExprKind getKind () const
 
SMLoc getLoc () const
 
Utility Methods
void print (raw_ostream &OS, const MCAsmInfo *MAI, bool InParens=false) const
 
void dump () const
 
Expression Evaluation
bool evaluateAsAbsolute (int64_t &Res, const MCAsmLayout &Layout, const SectionAddrMap &Addrs) const
 Try to evaluate the expression to an absolute value. More...
 
bool evaluateAsAbsolute (int64_t &Res) const
 
bool evaluateAsAbsolute (int64_t &Res, const MCAssembler &Asm) const
 
bool evaluateAsAbsolute (int64_t &Res, const MCAssembler *Asm) const
 
bool evaluateAsAbsolute (int64_t &Res, const MCAsmLayout &Layout) const
 
bool evaluateKnownAbsolute (int64_t &Res, const MCAsmLayout &Layout) const
 
bool evaluateAsRelocatable (MCValue &Res, const MCAsmLayout *Layout, const MCFixup *Fixup) const
 Try to evaluate the expression to a relocatable value, i.e. More...
 
bool evaluateAsValue (MCValue &Res, const MCAsmLayout &Layout) const
 Try to evaluate the expression to the form (a - b + constant) where neither a nor b are variables. More...
 
MCFragment * findAssociatedFragment () const
 Find the "associated section" for this expression, which is currently defined as the absolute section for constants, or otherwise the section associated with the first defined symbol in the expression. More...
 

Protected Member Functions

 MCExpr (ExprKind Kind, SMLoc Loc)
 
bool evaluateAsRelocatableImpl (MCValue &Res, const MCAssembler *Asm, const MCAsmLayout *Layout, const MCFixup *Fixup, const SectionAddrMap *Addrs, bool InSet) const
 

Detailed Description

Base class for the full range of assembler expressions which are needed for parsing.

Definition at line 36 of file MCExpr.h.

Member Enumeration Documentation

◆ ExprKind

enum llvm::MCExpr::ExprKind
Enumerator
Binary 

Binary expressions.

Constant 

Constant expressions.

SymbolRef 

References to labels and assigned expressions.

Unary 

Unary expressions.

Target 

Target specific expression.

Definition at line 38 of file MCExpr.h.

Constructor & Destructor Documentation

◆ MCExpr() [1/2]

llvm::MCExpr::MCExpr ( ExprKind  Kind,
SMLoc  Loc 
)
inlineexplicitprotected

Definition at line 59 of file MCExpr.h.

References llvm::HexStyle::Asm, evaluateAsRelocatableImpl(), Fixup, and operator=().

◆ MCExpr() [2/2]

llvm::MCExpr::MCExpr ( const MCExpr &  )
delete

Member Function Documentation

◆ dump()

LLVM_DUMP_METHOD void MCExpr::dump ( ) const

Definition at line 145 of file MCExpr.cpp.

Referenced by getLoc().

◆ evaluateAsAbsolute() [1/5]

bool MCExpr::evaluateAsAbsolute ( int64_t &  Res,
const MCAsmLayout &  Layout,
const SectionAddrMap &  Addrs 
) const

Try to evaluate the expression to an absolute value.

Parameters
Res- The absolute value, if evaluation succeeds.
Layout- The assembler layout object to use for evaluating symbol values. If not given, then only non-symbolic expressions will be evaluated.
Returns
- True on success.

Definition at line 456 of file MCExpr.cpp.

Referenced by llvm::AArch64InstPrinter::printAlignedLabel(), and llvm::ARMInstPrinter::printOperand().

◆ evaluateAsAbsolute() [2/5]

bool MCExpr::evaluateAsAbsolute ( int64_t &  Res) const

Definition at line 447 of file MCExpr.cpp.

◆ evaluateAsAbsolute() [3/5]

bool MCExpr::evaluateAsAbsolute ( int64_t &  Res,
const MCAssembler &  Asm 
) const

Definition at line 462 of file MCExpr.cpp.

◆ evaluateAsAbsolute() [4/5]

bool MCExpr::evaluateAsAbsolute ( int64_t &  Res,
const MCAssembler *  Asm 
) const

Definition at line 466 of file MCExpr.cpp.

◆ evaluateAsAbsolute() [5/5]

bool MCExpr::evaluateAsAbsolute ( int64_t &  Res,
const MCAsmLayout &  Layout 
) const

Definition at line 451 of file MCExpr.cpp.

◆ evaluateAsRelocatable()

bool MCExpr::evaluateAsRelocatable ( MCValue &  Res,
const MCAsmLayout *  Layout,
const MCFixup *  Fixup 
) const

Try to evaluate the expression to a relocatable value, i.e.

an expression of the fixed form (a - b + constant).

Parameters
Res- The relocatable value, if evaluation succeeds.
Layout- The assembler layout object to use for evaluating values.
Fixup- The Fixup object if available.
Returns
- True on success.

Definition at line 647 of file MCExpr.cpp.

References llvm::MCAsmLayout::getAssembler().

Referenced by canGoAfterDWARF(), llvm::CodeViewContext::encodeDefRange(), llvm::RISCVMCExpr::evaluateAsConstant(), llvm::PPCMCExpr::evaluateAsConstant(), llvm::HexagonMCExpr::evaluateAsRelocatableImpl(), llvm::LanaiMCExpr::evaluateAsRelocatableImpl(), llvm::RISCVMCExpr::evaluateAsRelocatableImpl(), llvm::MipsMCExpr::evaluateAsRelocatableImpl(), llvm::PPCMCExpr::evaluateAsRelocatableImpl(), llvm::SparcMCExpr::evaluateAsRelocatableImpl(), llvm::AArch64MCExpr::evaluateAsRelocatableImpl(), llvm::MCAssembler::getAtom(), getLoc(), llvm::RISCVMCExpr::getPCRelHiFixup(), llvm::MachObjectWriter::getSymbolAddress(), incrementLoc(), isOperator(), isShiftedUIntAtAnyPosition(), and llvm::MCAssembler::isThumbFunc().

◆ evaluateAsRelocatableImpl()

bool MCExpr::evaluateAsRelocatableImpl ( MCValue &  Res,
const MCAssembler *  Asm,
const MCAsmLayout *  Layout,
const MCFixup *  Fixup,
const SectionAddrMap *  Addrs,
bool  InSet 
) const
protected

-(a - b + const) ==> (b - a - const)

Definition at line 674 of file MCExpr.cpp.

References llvm::MCBinaryExpr::Add, llvm::MCBinaryExpr::And, llvm::MCBinaryExpr::AShr, B, canExpand(), llvm::MCBinaryExpr::Div, llvm::MCBinaryExpr::EQ, evaluateAsRelocatableImpl(), EvaluateSymbolicAdd(), llvm::MCValue::get(), llvm::MCValue::getConstant(), llvm::MCSymbolRefExpr::getKind(), llvm::MCBinaryExpr::getLHS(), llvm::MCUnaryExpr::getOpcode(), llvm::MCBinaryExpr::getOpcode(), llvm::MCBinaryExpr::getRHS(), llvm::MCUnaryExpr::getSubExpr(), llvm::MCValue::getSymA(), llvm::MCValue::getSymB(), llvm::MCSymbolRefExpr::getSymbol(), llvm::MCBinaryExpr::GT, llvm::MCBinaryExpr::GTE, llvm::MCSymbolRefExpr::hasSubsectionsViaSymbols(), llvm::MCBinaryExpr::LAnd, llvm_unreachable, llvm::MCUnaryExpr::LNot, llvm::MCBinaryExpr::LOr, llvm::MCBinaryExpr::LShr, llvm::MCBinaryExpr::LT, llvm::MCBinaryExpr::LTE, llvm::MCUnaryExpr::Minus, llvm::MCBinaryExpr::Mod, llvm::MCBinaryExpr::Mul, llvm::MCBinaryExpr::NE, llvm::MCUnaryExpr::Not, llvm::MCBinaryExpr::Or, llvm::MCUnaryExpr::Plus, llvm::MCBinaryExpr::Shl, llvm::MCBinaryExpr::Sub, llvm::MCSymbolRefExpr::VK_None, and llvm::MCBinaryExpr::Xor.

Referenced by evaluateAsRelocatableImpl(), MCExpr(), and llvm::MCTargetExpr::MCTargetExpr().

◆ evaluateAsValue()

bool MCExpr::evaluateAsValue ( MCValue &  Res,
const MCAsmLayout &  Layout 
) const

Try to evaluate the expression to the form (a - b + constant) where neither a nor b are variables.

This is a more aggressive variant of evaluateAsRelocatable. The intended use is for when relocations are not available, like the .size directive.

Definition at line 655 of file MCExpr.cpp.

References llvm::MCAsmLayout::getAssembler().

Referenced by llvm::MCAssembler::computeFragmentSize(), llvm::MCAsmLayout::getBaseSymbol(), getLoc(), llvm::RISCVMCExpr::getPCRelHiFixup(), and getSymbolOffsetImpl().

◆ evaluateKnownAbsolute()

bool MCExpr::evaluateKnownAbsolute ( int64_t &  Res,
const MCAsmLayout &  Layout 
) const

Definition at line 470 of file MCExpr.cpp.

Referenced by llvm::MCAssembler::Finish(), getLoc(), and mergeTypeForSet().

◆ findAssociatedFragment()

MCFragment * MCExpr::findAssociatedFragment ( ) const

Find the "associated section" for this expression, which is currently defined as the absolute section for constants, or otherwise the section associated with the first defined symbol in the expression.

Definition at line 867 of file MCExpr.cpp.

References llvm::MCSymbol::AbsolutePseudoFragment, findAssociatedFragment(), llvm::MCSymbol::getFragment(), llvm::MCBinaryExpr::getLHS(), llvm::MCBinaryExpr::getOpcode(), llvm::MCBinaryExpr::getRHS(), llvm::MCSymbolRefExpr::getSymbol(), llvm_unreachable, and llvm::MCBinaryExpr::Sub.

Referenced by llvm::HexagonMCExpr::findAssociatedFragment(), llvm::LanaiMCExpr::findAssociatedFragment(), llvm::AVRMCExpr::findAssociatedFragment(), llvm::ARMMCExpr::findAssociatedFragment(), llvm::RISCVMCExpr::findAssociatedFragment(), llvm::MipsMCExpr::findAssociatedFragment(), llvm::PPCMCExpr::findAssociatedFragment(), llvm::SparcMCExpr::findAssociatedFragment(), findAssociatedFragment(), llvm::MCSymbol::getFragment(), getLoc(), llvm::RISCVMCExpr::getPCRelHiFixup(), llvm::MCTargetExpr::inlineAssignedExpr(), and llvm::RISCVAsmBackend::shouldForceRelocation().

◆ getKind()

ExprKind llvm::MCExpr::getKind ( ) const
inline

Definition at line 73 of file MCExpr.h.

Referenced by addNegOperand(), llvm::HexagonMCExpr::classof(), llvm::LanaiMCExpr::classof(), llvm::AVRMCExpr::classof(), llvm::X86MCExpr::classof(), llvm::ARMMCExpr::classof(), llvm::RISCVMCExpr::classof(), llvm::MipsMCExpr::classof(), llvm::NVPTXFloatMCExpr::classof(), llvm::PPCMCExpr::classof(), llvm::SparcMCExpr::classof(), llvm::NVPTXGenericMCSymbolRefExpr::classof(), llvm::MCConstantExpr::classof(), llvm::AArch64MCExpr::classof(), llvm::MCSymbolRefExpr::classof(), llvm::MCUnaryExpr::classof(), llvm::MCBinaryExpr::classof(), llvm::MCTargetExpr::classof(), ConvertDoubleToBytes(), countMCSymbolRefExpr(), llvm::MipsTargetELFStreamer::emitAssignment(), llvm::MCELFStreamer::EmitIdent(), llvm::MCObjectStreamer::EmitRelocDirective(), EvaluateCRExpr(), fixELFSymbolsInTLSFixupsImpl(), getAccessVariant(), llvm::MipsMCCodeEmitter::getExprOpValue(), HasConditionalBranch(), hasGOTReference(), HasSecRelSymbolRef(), llvm::MCOperand::isBareSymbolRef(), isOperator(), isPCRel(), IsSmallMemAccess(), llvm::MCParserUtils::isSymbolUsedInExpression(), needsPCRel(), print(), llvm::X86Operand::print(), llvm::ARMMCExpr::printImpl(), RefineErrorLoc(), StartsWithGlobalOffsetTable(), and llvm::MCStreamer::visitUsedExpr().

◆ getLoc()

SMLoc llvm::MCExpr::getLoc ( ) const
inline

Definition at line 74 of file MCExpr.h.

References dump(), evaluateAsRelocatable(), evaluateAsValue(), evaluateKnownAbsolute(), findAssociatedFragment(), and print().

Referenced by llvm::MCELFStreamer::EmitIdent(), and llvm::MCAsmLayout::getBaseSymbol().

◆ operator=()

MCExpr& llvm::MCExpr::operator= ( const MCExpr &  )
delete

Referenced by MCExpr().

◆ print()

void MCExpr::print ( raw_ostream &  OS,
const MCAsmInfo *  MAI,
bool  InParens = false 
) const

Definition at line 42 of file MCExpr.cpp.

References llvm::MCBinaryExpr::Add, llvm::MCBinaryExpr::And, llvm::MCBinaryExpr::AShr, Binary, Constant, llvm::MCBinaryExpr::Div, llvm::StringRef::empty(), llvm::MCBinaryExpr::EQ, getKind(), llvm::MCSymbolRefExpr::getKind(), llvm::MCBinaryExpr::getLHS(), llvm::MCSymbol::getName(), llvm::MCUnaryExpr::getOpcode(), llvm::MCBinaryExpr::getOpcode(), llvm::MCBinaryExpr::getRHS(), llvm::MCUnaryExpr::getSubExpr(), llvm::MCSymbolRefExpr::getSymbol(), llvm::MCBinaryExpr::GT, llvm::MCUnaryExpr::LNot, llvm::MCUnaryExpr::Minus, llvm::MCUnaryExpr::Not, llvm::MCUnaryExpr::Plus, print(), llvm::MCSymbol::print(), llvm::MCSymbolRefExpr::printVariantKind(), SymbolRef, Target, Unary, and llvm::MCSymbolRefExpr::VK_None.

Referenced by createPPCMCAsmInfo(), llvm::MCTargetStreamer::emitValue(), GetAEABIUnwindPersonalityName(), getLoc(), getOpenCLAlignment(), getPlatformName(), llvm::operator<<(), print(), llvm::AArch64InstPrinter::printAddSubImm(), llvm::ARMInstPrinter::printAdrLabelOperand(), llvm::AArch64InstPrinter::printAdrpLabel(), llvm::AArch64InstPrinter::printAlignedLabel(), llvm::AArch64InstPrinter::printAMIndexedWB(), PrintCFIEscape(), llvm::LanaiInstPrinter::printHi16AndImmOperand(), llvm::LanaiInstPrinter::printHi16ImmOperand(), llvm::HexagonMCExpr::printImpl(), llvm::LanaiMCExpr::printImpl(), llvm::ARMMCExpr::printImpl(), llvm::RISCVMCExpr::printImpl(), llvm::MipsMCExpr::printImpl(), llvm::PPCMCExpr::printImpl(), llvm::SparcMCExpr::printImpl(), llvm::AArch64MCExpr::printImpl(), llvm::MSP430InstPrinter::printInst(), llvm::AArch64InstPrinter::printInst(), llvm::MipsInstPrinter::printInst(), llvm::R600InstPrinter::printLiteral(), llvm::LanaiInstPrinter::printLo16AndImmOperand(), llvm::LanaiInstPrinter::printMemImmOperand(), llvm::X86IntelInstPrinter::printMemOffset(), llvm::X86ATTInstPrinter::printMemOffset(), printMemoryImmediateOffset(), llvm::X86IntelInstPrinter::printMemReference(), llvm::X86ATTInstPrinter::printMemReference(), llvm::LanaiInstPrinter::printOperand(), llvm::RISCVInstPrinter::printOperand(), llvm::X86IntelInstPrinter::printOperand(), llvm::NVPTXInstPrinter::printOperand(), llvm::SystemZInstPrinter::printOperand(), llvm::X86ATTInstPrinter::printOperand(), llvm::SparcInstPrinter::printOperand(), llvm::WebAssemblyInstPrinter::printOperand(), llvm::PPCInstPrinter::printOperand(), llvm::AArch64InstPrinter::printOperand(), llvm::R600InstPrinter::printOperand(), llvm::X86InstPrinterCommon::printPCRelImm(), PrintQuotedString(), llvm::AMDGPUInstPrinter::printRegOperand(), printSImmOperand(), llvm::MCSectionWasm::PrintSwitchToSection(), llvm::MCSectionELF::PrintSwitchToSection(), llvm::ARMInstPrinter::printThumbLdrLabelOperand(), llvm::X86IntelInstPrinter::printU8Imm(), and llvm::AArch64InstPrinter::printUImm12Offset().

The documentation for this class was generated from the following files:
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