llvm::DIEDwarfExpression Class Reference

DwarfExpression implementation for singular DW_AT_location. More...

#include "CodeGen/AsmPrinter/DwarfExpression.h"

Inheritance diagram for llvm::DIEDwarfExpression:

Public Member Functions
	DIEDwarfExpression (const AsmPrinter &AP, DwarfCompileUnit &CU, DIELoc &DIE)
DIELoc *	finalize ()
Public Member Functions inherited from llvm::DwarfExpression
void	setLocation (const MachineLocation &Loc, const DIExpression *DIExpr)
	Set the location (Loc) and DIExpression (DIExpr) to describe.
bool	isUnknownLocation () const
bool	isMemoryLocation () const
bool	isRegisterLocation () const
bool	isImplicitLocation () const
bool	isEntryValue () const
bool	isIndirect () const
bool	isParameterValue ()
	DwarfExpression (unsigned DwarfVersion, DwarfCompileUnit &CU)
void	finalize ()
	This needs to be called last to commit any pending changes.
void	addBooleanConstant (int64_t Value)
	Emit a boolean constant.
void	addSignedConstant (int64_t Value)
	Emit a signed constant.
void	addUnsignedConstant (uint64_t Value)
	Emit an unsigned constant.
void	addUnsignedConstant (const APInt &Value)
	Emit an unsigned constant.
void	addConstantFP (const APFloat &Value, const AsmPrinter &AP)
	Emit an floating point constant.
void	setMemoryLocationKind ()
	Lock this down to become a memory location description.
void	setEntryValueFlags (const MachineLocation &Loc)
	Lock this down to become an entry value location.
void	setCallSiteParamValueFlag ()
	Lock this down to become a call site parameter location.
bool	addMachineRegExpression (const TargetRegisterInfo &TRI, DIExpressionCursor &Expr, llvm::Register MachineReg, unsigned FragmentOffsetInBits=0)
	Emit a machine register location.
void	beginEntryValueExpression (DIExpressionCursor &ExprCursor)
	Begin emission of an entry value dwarf operation.
unsigned	getOrCreateBaseType (unsigned BitSize, dwarf::TypeKind Encoding)
	Return the index of a base type with the given properties and create one if necessary.
void	addExpression (DIExpressionCursor &&Expr)
	Emit all remaining operations in the DIExpressionCursor.
bool	addExpression (DIExpressionCursor &&Expr, llvm::function_ref< bool(unsigned, DIExpressionCursor &)> InsertArg)
	Emit all remaining operations in the DIExpressionCursor.
void	addFragmentOffset (const DIExpression *Expr)
	If applicable, emit an empty DW_OP_piece / DW_OP_bit_piece to advance to the fragment described by Expr.
void	emitLegacySExt (unsigned FromBits)
void	emitLegacyZExt (unsigned FromBits)
void	addWasmLocation (unsigned Index, uint64_t Offset)
	Emit location information expressed via WebAssembly location + offset The Index is an identifier for locals, globals or operand stack.

Additional Inherited Members
Public Attributes inherited from llvm::DwarfExpression
std::optional< uint8_t >	TagOffset
Protected Types inherited from llvm::DwarfExpression
enum	{ Unknown = 0 , Register , Memory , Implicit }
	The kind of location description being produced. More...
enum	{ EntryValue = 1 << 0 , Indirect = 1 << 1 , CallSiteParamValue = 1 << 2 }
	Additional location flags which may be combined with any location kind. More...
Protected Member Functions inherited from llvm::DwarfExpression
void	setSubRegisterPiece (unsigned SizeInBits, unsigned OffsetInBits)
	Push a DW_OP_piece / DW_OP_bit_piece for emitting later, if one is needed to represent a subregister.
void	maskSubRegister ()
	Add masking operations to stencil out a subregister.
void	emitConstu (uint64_t Value)
	Emit a normalized unsigned constant.
void	addReg (int64_t DwarfReg, const char *Comment=nullptr)
	Emit a DW_OP_reg operation.
void	addBReg (int64_t DwarfReg, int64_t Offset)
	Emit a DW_OP_breg operation.
void	addFBReg (int64_t Offset)
	Emit DW_OP_fbreg <Offset>.
bool	addMachineReg (const TargetRegisterInfo &TRI, llvm::Register MachineReg, unsigned MaxSize=~1U)
	Emit a partial DWARF register operation.
void	addOpPiece (unsigned SizeInBits, unsigned OffsetInBits=0)
	Emit a DW_OP_piece or DW_OP_bit_piece operation for a variable fragment.
void	addShr (unsigned ShiftBy)
	Emit a shift-right dwarf operation.
void	addAnd (unsigned Mask)
	Emit a bitwise and dwarf operation.
void	addStackValue ()
	Emit a DW_OP_stack_value, if supported.
void	finalizeEntryValue ()
	Finalize an entry value by emitting its size operand, and committing the DWARF block which has been emitted to the temporary buffer.
void	cancelEntryValue ()
	Cancel the emission of an entry value.
	~DwarfExpression ()=default
Protected Attributes inherited from llvm::DwarfExpression
bool	IsEmittingEntryValue = false
	Whether we are currently emitting an entry value operation.
DwarfCompileUnit &	CU
SmallVector< Register, 2 >	DwarfRegs
	The register location, if any.
uint64_t	OffsetInBits = 0
	Current Fragment Offset in Bits.
unsigned	SubRegisterSizeInBits: 16
	Sometimes we need to add a DW_OP_bit_piece to describe a subregister.
unsigned	SubRegisterOffsetInBits: 16
unsigned	LocationKind: 3
unsigned	SavedLocationKind: 3
unsigned	LocationFlags: 3
unsigned	DwarfVersion: 4

Detailed Description

DwarfExpression implementation for singular DW_AT_location.

Definition at line 347 of file DwarfExpression.h.

Constructor & Destructor Documentation

DIEDwarfExpression()

DIEDwarfExpression::DIEDwarfExpression	(	const AsmPrinter &	AP,
		DwarfCompileUnit &	CU,
		DIELoc &	DIE )

Definition at line 41 of file DwarfUnit.cpp.

References llvm::DwarfExpression::DwarfExpression().

Member Function Documentation

finalize()

DIELoc * llvm::DIEDwarfExpression::finalize ( )

inline

Definition at line 373 of file DwarfExpression.h.

References llvm::DwarfExpression::finalize().

Referenced by llvm::DwarfCompileUnit::addAddress(), llvm::DwarfCompileUnit::addComplexAddress(), llvm::DwarfCompileUnit::constructCallSiteParmEntryDIEs(), llvm::DwarfUnit::constructTypeDIE(), and llvm::DwarfCompileUnit::updateSubprogramScopeDIE().

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

• lib/CodeGen/AsmPrinter/DwarfExpression.h
• lib/CodeGen/AsmPrinter/DwarfUnit.cpp