clang::LiveVariables Class Reference

#include "clang/Analysis/Analyses/LiveVariables.h"

Inheritance diagram for clang::LiveVariables:

Classes
class	LivenessValues
class	Observer

Public Member Functions
	~LiveVariables () override
bool	isLive (const CFGBlock *B, const VarDecl *D)
	Return true if a variable is live at the end of a specified block.
bool	isLive (const Stmt *S, const VarDecl *D)
	Returns true if a variable is live at the beginning of the the statement.
bool	isLive (const Stmt *Loc, const Expr *Val)
	Returns true the block-level expression value is live before the given block-level expression (see runOnAllBlocks).
void	dumpBlockLiveness (const SourceManager &M)
	Print to stderr the variable liveness information associated with each basic block.
void	dumpExprLiveness (const SourceManager &M)
	Print to stderr the expression liveness information associated with each basic block.
void	runOnAllBlocks (Observer &obs)
Public Member Functions inherited from clang::ManagedAnalysis
virtual	~ManagedAnalysis ()

Static Public Member Functions
static std::unique_ptr< LiveVariables >	computeLiveness (AnalysisDeclContext &analysisContext, bool killAtAssign)
	Compute the liveness information for a given CFG.
static std::unique_ptr< LiveVariables >	create (AnalysisDeclContext &analysisContext)
static const void *	getTag ()

Additional Inherited Members
Protected Member Functions inherited from clang::ManagedAnalysis
	ManagedAnalysis ()=default

Detailed Description

Definition at line 28 of file LiveVariables.h.

Constructor & Destructor Documentation

~LiveVariables()

LiveVariables::~LiveVariables ( )

override

Definition at line 518 of file LiveVariables.cpp.

Member Function Documentation

computeLiveness()

std::unique_ptr< LiveVariables > LiveVariables::computeLiveness ( AnalysisDeclContext &  analysisContext, bool  killAtAssign  )

static

Compute the liveness information for a given CFG.

Definition at line 523 of file LiveVariables.cpp.

References clang::DataflowWorklistBase< Comp, QueueSize >::dequeue(), clang::DataflowWorklistBase< Comp, QueueSize >::enqueueBlock(), clang::BackwardDataflowWorklist::enqueuePredecessors(), clang::LiveVariables::LivenessValues::equals(), clang::CFGBlock::getBlockID(), clang::CFG::getNumBlockIDs(), clang::CFG::nodes(), clang::CFGBlock::succ_begin(), and clang::CFGBlock::succ_end().

Referenced by create(), and clang::RelaxedLiveVariables::create().

create()

static std::unique_ptr< LiveVariables > clang::LiveVariables::create ( AnalysisDeclContext &  analysisContext )

inlinestatic

Definition at line 101 of file LiveVariables.h.

References computeLiveness().

dumpBlockLiveness()

void LiveVariables::dumpBlockLiveness

(

const SourceManager &

M

)

Print to stderr the variable liveness information associated with each basic block.

Definition at line 578 of file LiveVariables.cpp.

References getImpl().

dumpExprLiveness()

void LiveVariables::dumpExprLiveness

(

const SourceManager &

M

)

Print to stderr the expression liveness information associated with each basic block.

Definition at line 624 of file LiveVariables.cpp.

References getImpl().

getTag()

const void * LiveVariables::getTag ( )

static

Definition at line 642 of file LiveVariables.cpp.

isLive() [1/3]

bool LiveVariables::isLive	(	const CFGBlock *	B,
		const VarDecl *	D
	)

Return true if a variable is live at the end of a specified block.

Definition at line 141 of file LiveVariables.cpp.

References getImpl(), and isAlwaysAlive().

Referenced by clang::ento::SymbolReaper::isLive().

isLive() [2/3]

bool LiveVariables::isLive	(	const Stmt *	Loc,
		const Expr *	Val
	)

Returns true the block-level expression value is live before the given block-level expression (see runOnAllBlocks).

Definition at line 149 of file LiveVariables.cpp.

References getImpl().

isLive() [3/3]

bool LiveVariables::isLive	(	const Stmt *	S,
		const VarDecl *	D
	)

Returns true if a variable is live at the beginning of the the statement.

This query only works if liveness information has been recorded at the statement level (see runOnAllBlocks), and only returns liveness information for block-level expressions.

Definition at line 145 of file LiveVariables.cpp.

References getImpl(), and isAlwaysAlive().

runOnAllBlocks()

void LiveVariables::runOnAllBlocks

(

LiveVariables::Observer &

obs

)

Definition at line 510 of file LiveVariables.cpp.

References clang::CFG::begin(), clang::CFG::end(), and getImpl().

---

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

• include/clang/Analysis/Analyses/LiveVariables.h
• lib/Analysis/LiveVariables.cpp