LiveDebugVariables.cpp File Reference

#include "LiveDebugVariables.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/IntervalMap.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/LiveInterval.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetOpcodes.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/Function.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <iterator>
#include <memory>
#include <optional>
#include <utility>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "livedebugvars"

Typedefs
using	LocMap = IntervalMap< SlotIndex, DbgVariableValue, 4 >
	Map of where a user value is live to that value.
using	SpillOffsetMap = DenseMap< unsigned, unsigned >
	Map of stack slot offsets for spilled locations.
using	BlockSkipInstsMap = DenseMap< MachineBasicBlock *, MachineBasicBlock::iterator >
	Cache to save the location where it can be used as the starting position as input for calling MachineBasicBlock::SkipPHIsLabelsAndDebug.

Enumerations
enum	: unsigned { UndefLocNo = ~0U }

Functions
	STATISTIC (NumInsertedDebugValues, "Number of DBG_VALUEs inserted")
	STATISTIC (NumInsertedDebugLabels, "Number of DBG_LABELs inserted")
	INITIALIZE_PASS_BEGIN (LiveDebugVariables, DEBUG_TYPE, "Debug Variable Analysis", false, false) INITIALIZE_PASS_END(LiveDebugVariables
static void	printDebugLoc (const DebugLoc &DL, raw_ostream &CommentOS, const LLVMContext &Ctx)
static void	printExtendedName (raw_ostream &OS, const DINode *Node, const DILocation *DL)
static void	removeDebugInstrs (MachineFunction &mf)
static MachineBasicBlock::iterator	findInsertLocation (MachineBasicBlock *MBB, SlotIndex Idx, LiveIntervals &LIS, BlockSkipInstsMap &BBSkipInstsMap)
	Find an iterator for inserting a DBG_VALUE instruction.
static MachineBasicBlock::iterator	findNextInsertLocation (MachineBasicBlock *MBB, MachineBasicBlock::iterator I, SlotIndex StopIdx, ArrayRef< MachineOperand > LocMOs, LiveIntervals &LIS, const TargetRegisterInfo &TRI)
	Find an iterator for inserting the next DBG_VALUE instruction (or end if no more insert locations found).

Variables
static cl::opt< bool >	EnableLDV ("live-debug-variables", cl::init(true), cl::desc("Enable the live debug variables pass"), cl::Hidden)
	DEBUG_TYPE
Debug Variable	Analysis
Debug Variable	false

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "livedebugvars"

Definition at line 67 of file LiveDebugVariables.cpp.

Typedef Documentation

BlockSkipInstsMap

using BlockSkipInstsMap = DenseMap<MachineBasicBlock *, MachineBasicBlock::iterator>

Cache to save the location where it can be used as the starting position as input for calling MachineBasicBlock::SkipPHIsLabelsAndDebug.

This is to prevent MachineBasicBlock::SkipPHIsLabelsAndDebug from repeatedly searching the same set of PHIs/Labels/Debug instructions if it is called many times for the same block.

Definition at line 271 of file LiveDebugVariables.cpp.

LocMap

using LocMap = IntervalMap<SlotIndex, DbgVariableValue, 4>

Map of where a user value is live to that value.

Definition at line 260 of file LiveDebugVariables.cpp.

SpillOffsetMap

using SpillOffsetMap = DenseMap<unsigned, unsigned>

Map of stack slot offsets for spilled locations.

Non-spilled locations are not added to the map.

Definition at line 264 of file LiveDebugVariables.cpp.

Enumeration Type Documentation

anonymous enum

anonymous enum : unsigned

Enumerator
UndefLocNo

Definition at line 96 of file LiveDebugVariables.cpp.

Function Documentation

findInsertLocation()

static MachineBasicBlock::iterator findInsertLocation ( MachineBasicBlock *  MBB, SlotIndex  Idx, LiveIntervals &  LIS, BlockSkipInstsMap &  BBSkipInstsMap  )

static

Find an iterator for inserting a DBG_VALUE instruction.

Definition at line 1589 of file LiveDebugVariables.cpp.

References llvm::MachineBasicBlock::begin(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::MachineBasicBlock::getFirstTerminator(), llvm::LiveIntervals::getInstructionFromIndex(), llvm::LiveIntervals::getMBBStartIdx(), I, Idx, MBB, MI, and llvm::MachineBasicBlock::SkipPHIsLabelsAndDebug().

findNextInsertLocation()

static MachineBasicBlock::iterator findNextInsertLocation ( MachineBasicBlock *  MBB, MachineBasicBlock::iterator  I, SlotIndex  StopIdx, ArrayRef< MachineOperand >  LocMOs, LiveIntervals &  LIS, const TargetRegisterInfo &  TRI  )

static

Find an iterator for inserting the next DBG_VALUE instruction (or end if no more insert locations found).

Definition at line 1635 of file LiveDebugVariables.cpp.

References llvm::any_of(), llvm::SmallVectorBase< Size_T >::empty(), llvm::MachineBasicBlock::end(), llvm::LiveIntervals::getInstructionIndex(), llvm::MachineOperand::getReg(), I, llvm::MachineBasicBlock::instr_end(), llvm::SlotIndex::isEarlierEqualInstr(), llvm::LiveIntervals::isNotInMIMap(), llvm::MachineOperand::isReg(), MBB, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and TRI.

INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	LiveDebugVariables	,
		DEBUG_TYPE	,
		"Debug Variable Analysis"	,
		false	,
		false
	)

printDebugLoc()

static void printDebugLoc ( const DebugLoc &  DL, raw_ostream &  CommentOS, const LLVMContext &  Ctx  )

static

Definition at line 676 of file LiveDebugVariables.cpp.

References DL, and printDebugLoc().

Referenced by printDebugLoc(), and printExtendedName().

printExtendedName()

static void printExtendedName ( raw_ostream &  OS, const DINode *  Node, const DILocation *  DL  )

static

Definition at line 697 of file LiveDebugVariables.cpp.

References DL, llvm::StringRef::empty(), OS, and printDebugLoc().

removeDebugInstrs()

static void removeDebugInstrs ( MachineFunction &  mf )

static

Definition at line 1292 of file LiveDebugVariables.cpp.

References llvm::MachineBasicBlock::erase(), llvm::make_early_inc_range(), MBB, and MI.

STATISTIC() [1/2]

STATISTIC	(	NumInsertedDebugLabels	,
		"Number of DBG_LABELs inserted"
	)

STATISTIC() [2/2]

STATISTIC	(	NumInsertedDebugValues	,
		"Number of DBG_VALUEs inserted"
	)

Variable Documentation

Analysis

Debug Variable Analysis

Definition at line 83 of file LiveDebugVariables.cpp.

DEBUG_TYPE

DEBUG_TYPE

Definition at line 82 of file LiveDebugVariables.cpp.

EnableLDV

cl::opt< bool > EnableLDV("live-debug-variables", cl::init(true), cl::desc("Enable the live debug variables pass"), cl::Hidden) ( "live-debug-variables"  , cl::init(true)  , cl::desc("Enable the live debug variables pass")  , cl::Hidden    )

static

false

Debug Variable false

Definition at line 83 of file LiveDebugVariables.cpp.