Target-independent base class incharge of all code padding decisions for a target. More...

#include "llvm/MC/MCCodePadder.h"

Collaboration diagram for llvm::MCCodePadder:

Public Member Functions
	MCCodePadder ()

virtual	~MCCodePadder ()

void	handleBasicBlockStart (MCObjectStreamer *OS, const MCCodePaddingContext &Context)
	Handles all target related code padding when starting to write a new basic block to an object file. More...

void	handleBasicBlockEnd (const MCCodePaddingContext &Context)
	Handles all target related code padding when done writing a block to an object file. More...

void	handleInstructionBegin (const MCInst &Inst)
	Handles all target related code padding before writing a new instruction to an object file. More...

void	handleInstructionEnd (const MCInst &Inst)
	Handles all target related code padding after writing an instruction to an object file. More...

bool	relaxFragment (MCPaddingFragment *Fragment, MCAsmLayout &Layout)
	Relaxes a fragment (changes the size of the padding) according to target requirements. More...

Protected Member Functions
bool	addPolicy (MCCodePaddingPolicy *Policy)

virtual bool	basicBlockRequiresInsertionPoint (const MCCodePaddingContext &Context)

virtual bool	instructionRequiresInsertionPoint (const MCInst &Inst)

virtual bool	usePoliciesForBasicBlock (const MCCodePaddingContext &Context)

Protected Attributes
MCObjectStreamer *	OS
	The current streamer, used to stream code padding. More...

Detailed Description

Target-independent base class incharge of all code padding decisions for a target.

During encoding it determines if and where MCPaddingFragments will be located, as later on, when layout information is available, it determines their sizes.

Definition at line 39 of file MCCodePadder.h.

Constructor & Destructor Documentation

◆ MCCodePadder()

llvm::MCCodePadder::MCCodePadder ( )

inline

Definition at line 85 of file MCCodePadder.h.

References Context.

◆ ~MCCodePadder()

MCCodePadder::~MCCodePadder ( )

virtual

Definition at line 23 of file MCCodePadder.cpp.

Member Function Documentation

◆ addPolicy()

bool MCCodePadder::addPolicy ( MCCodePaddingPolicy * Policy )

protected

Definition at line 28 of file MCCodePadder.cpp.

References assert().

◆ basicBlockRequiresInsertionPoint()

virtual bool llvm::MCCodePadder::basicBlockRequiresInsertionPoint ( const MCCodePaddingContext & Context )

inlineprotectedvirtual

Definition at line 72 of file MCCodePadder.h.

Referenced by handleBasicBlockStart().

◆ handleBasicBlockEnd()

void MCCodePadder::handleBasicBlockEnd ( const MCCodePaddingContext & Context )

Handles all target related code padding when done writing a block to an object file.

Parameters

Context the context of the padding, Embeds the basic block's parameters.

Definition at line 69 of file MCCodePadder.cpp.

References assert(), and OS.

◆ handleBasicBlockStart()

void MCCodePadder::handleBasicBlockStart	(	MCObjectStreamer *	OS,
		const MCCodePaddingContext &	Context
	)

Handles all target related code padding when starting to write a new basic block to an object file.

Parameters

OS	The streamer used for writing the padding data and function.
Context	the context of the padding, Embeds the basic block's parameters.

Definition at line 33 of file MCCodePadder.cpp.

References assert(), basicBlockRequiresInsertionPoint(), Context, llvm::MCFragment::FT_Align, llvm::MCObjectStreamer::getCurrentFragment(), llvm::MCFragment::getKind(), llvm::MCObjectStreamer::getOrCreatePaddingFragment(), llvm::MCPaddingFragment::getPaddingPoliciesMask(), llvm::BitmaskEnumDetail::Mask(), OS, llvm::MCPaddingFragment::PFK_None, llvm::MCPaddingFragment::setAsInsertionPoint(), llvm::MCPaddingFragment::setPaddingPoliciesMask(), and usePoliciesForBasicBlock().

◆ handleInstructionBegin()

void MCCodePadder::handleInstructionBegin ( const MCInst & Inst )

Handles all target related code padding before writing a new instruction to an object file.

Parameters

Inst	the instruction.

Definition at line 74 of file MCCodePadder.cpp.

References assert(), llvm::MCFragment::FT_Align, llvm::MCFragment::FT_Padding, llvm::MCObjectStreamer::getCurrentFragment(), llvm::MCFragment::getKind(), llvm::MCObjectStreamer::getOrCreatePaddingFragment(), llvm::MCPaddingFragment::getPaddingPoliciesMask(), instructionRequiresInsertionPoint(), llvm::BitmaskEnumDetail::Mask(), OS, llvm::MCPaddingFragment::PFK_None, llvm::MCPaddingFragment::setAsInsertionPoint(), and llvm::MCPaddingFragment::setPaddingPoliciesMask().

◆ handleInstructionEnd()

void MCCodePadder::handleInstructionEnd ( const MCInst & Inst )

Handles all target related code padding after writing an instruction to an object file.

Parameters

Inst	the instruction.

Definition at line 118 of file MCCodePadder.cpp.

References assert(), llvm::dyn_cast(), for(), llvm::MCObjectStreamer::getCurrentFragment(), llvm::ilist_node_with_parent< NodeTy, ParentTy, Options >::getNextNode(), llvm::MCPaddingFragment::hasPaddingPolicy(), llvm::MCPaddingFragment::isInsertionPoint(), llvm_unreachable, llvm::max(), OS, llvm::MCPaddingFragment::PFK_None, llvm::MCPaddingFragment::setInstAndInstFragment(), llvm::MCPaddingFragment::setInstAndInstSize(), and llvm::MCInst::size().

◆ instructionRequiresInsertionPoint()

virtual bool llvm::MCCodePadder::instructionRequiresInsertionPoint ( const MCInst & Inst )

inlineprotectedvirtual

Definition at line 76 of file MCCodePadder.h.

Referenced by handleInstructionBegin().

◆ relaxFragment()

bool MCCodePadder::relaxFragment	(	MCPaddingFragment *	Fragment,
		MCAsmLayout &	Layout
	)

Relaxes a fragment (changes the size of the padding) according to target requirements.

The new size computation is done w.r.t a layout.

Parameters

Fragment	The fragment to relax.
Layout	Code layout information.

Returns: true iff any relaxation occurred.

Definition at line 208 of file MCCodePadder.cpp.

References assert(), llvm::MCSection::getAlignment(), llvm::MCFragment::getParent(), llvm::MCPaddingFragment::getSize(), llvm::MCAsmLayout::invalidateFragmentsFrom(), llvm::MCPaddingFragment::isInsertionPoint(), llvm::isPowerOf2_64(), llvm::max(), llvm::MCPaddingFragment::setSize(), and Size.

◆ usePoliciesForBasicBlock()

virtual bool llvm::MCCodePadder::usePoliciesForBasicBlock ( const MCCodePaddingContext & Context )

inlineprotectedvirtual

Definition at line 80 of file MCCodePadder.h.

References llvm::MCCodePaddingContext::IsPaddingActive.

Referenced by handleBasicBlockStart().

Member Data Documentation

◆ OS

MCObjectStreamer* llvm::MCCodePadder::OS

protected

The current streamer, used to stream code padding.

Definition at line 67 of file MCCodePadder.h.

Referenced by handleBasicBlockEnd(), handleBasicBlockStart(), handleInstructionBegin(), and handleInstructionEnd().

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

include/llvm/MC/MCCodePadder.h
lib/MC/MCCodePadder.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ MCCodePadder()

◆ ~MCCodePadder()

Member Function Documentation

◆ addPolicy()

◆ basicBlockRequiresInsertionPoint()

◆ handleBasicBlockEnd()

◆ handleBasicBlockStart()

◆ handleInstructionBegin()

◆ handleInstructionEnd()

◆ instructionRequiresInsertionPoint()

◆ relaxFragment()

◆ usePoliciesForBasicBlock()

Member Data Documentation

◆ OS