Represents a source-level, intra-procedural CFG that represents the control-flow of a Stmt. More...

#include "clang/Analysis/CFG.h"

Classes
class	BuildOptions

Public Types
using	CFGBlockListTy = BumpVector<CFGBlock *>
using	iterator = CFGBlockListTy::iterator
using	const_iterator = CFGBlockListTy::const_iterator
using	reverse_iterator = std::reverse_iterator<iterator>
using	const_reverse_iterator = std::reverse_iterator<const_iterator>
using	try_block_iterator = std::vector<const CFGBlock *>::const_iterator
using	try_block_range = llvm::iterator_range<try_block_iterator>
using	synthetic_stmt_iterator
using	synthetic_stmt_range = llvm::iterator_range<synthetic_stmt_iterator>

Public Member Functions
CFGBlock *	createBlock ()
	Create a new block in the CFG.
void	setEntry (CFGBlock *B)
	Set the entry block of the CFG.
void	setIndirectGotoBlock (CFGBlock *B)
	Set the block used for indirect goto jumps.
CFGBlock &	front ()
CFGBlock &	back ()
iterator	begin ()
iterator	end ()
const_iterator	begin () const
const_iterator	end () const
iterator	nodes_begin ()
iterator	nodes_end ()
llvm::iterator_range< iterator >	nodes ()
llvm::iterator_range< const_iterator >	const_nodes () const
const_iterator	nodes_begin () const
const_iterator	nodes_end () const
reverse_iterator	rbegin ()
reverse_iterator	rend ()
const_reverse_iterator	rbegin () const
const_reverse_iterator	rend () const
llvm::iterator_range< reverse_iterator >	reverse_nodes ()
llvm::iterator_range< const_reverse_iterator >	const_reverse_nodes () const
CFGBlock &	getEntry ()
const CFGBlock &	getEntry () const
CFGBlock &	getExit ()
const CFGBlock &	getExit () const
CFGBlock *	getIndirectGotoBlock ()
const CFGBlock *	getIndirectGotoBlock () const
try_block_iterator	try_blocks_begin () const
try_block_iterator	try_blocks_end () const
try_block_range	try_blocks () const
void	addTryDispatchBlock (const CFGBlock *block)
void	addSyntheticDeclStmt (const DeclStmt Synthetic, const DeclStmt Source)
	Records a synthetic DeclStmt and the DeclStmt it was constructed from.
synthetic_stmt_iterator	synthetic_stmt_begin () const
	Iterates over synthetic DeclStmts in the CFG.
synthetic_stmt_iterator	synthetic_stmt_end () const
synthetic_stmt_range	synthetic_stmts () const
template<typename Callback>
void	VisitBlockStmts (Callback &O) const
unsigned	getNumBlockIDs () const
	Returns the total number of BlockIDs allocated (which start at 0).
unsigned	size () const
	Return the total number of CFGBlocks within the CFG This is simply a renaming of the getNumBlockIDs().
bool	isLinear () const
	Returns true if the CFG has no branches.
void	viewCFG (const LangOptions &LO) const
void	print (raw_ostream &OS, const LangOptions &LO, bool ShowColors) const
	print - A simple pretty printer of a CFG that outputs to an ostream.
void	dump (const LangOptions &LO, bool ShowColors) const
	dump - A simple pretty printer of a CFG that outputs to stderr.
	CFG ()
llvm::BumpPtrAllocator &	getAllocator ()
BumpVectorContext &	getBumpVectorContext ()

Static Public Member Functions
static std::unique_ptr< CFG >	buildCFG (const Decl D, Stmt AST, ASTContext *C, const BuildOptions &BO)
	Builds a CFG from an AST.

Detailed Description

Represents a source-level, intra-procedural CFG that represents the control-flow of a Stmt.

The Stmt can represent an entire function body, or a single expression. A CFG will always contain one empty block that represents the Exit point of the CFG. A CFG will also contain a designated Entry block. The CFG solely represents control-flow; it consists of CFGBlocks which are simply containers of Stmt*'s in the AST the CFG was constructed from.

Definition at line 1271 of file CFG.h.

Member Typedef Documentation

◆ CFGBlockListTy

using clang::CFG::CFGBlockListTy = BumpVector<CFGBlock *>

Definition at line 1348 of file CFG.h.

◆ const_iterator

using clang::CFG::const_iterator = CFGBlockListTy::const_iterator

Definition at line 1350 of file CFG.h.

◆ const_reverse_iterator

using clang::CFG::const_reverse_iterator = std::reverse_iterator<const_iterator>

Definition at line 1352 of file CFG.h.

◆ iterator

using clang::CFG::iterator = CFGBlockListTy::iterator

Definition at line 1349 of file CFG.h.

◆ reverse_iterator

using clang::CFG::reverse_iterator = std::reverse_iterator<iterator>

Definition at line 1351 of file CFG.h.

◆ synthetic_stmt_iterator

using clang::CFG::synthetic_stmt_iterator

Initial value:

llvm::DenseMap<const DeclStmt *, const DeclStmt *>::const_iterator

Definition at line 1424 of file CFG.h.

◆ synthetic_stmt_range

using clang::CFG::synthetic_stmt_range = llvm::iterator_range<synthetic_stmt_iterator>

Definition at line 1426 of file CFG.h.

◆ try_block_iterator

using clang::CFG::try_block_iterator = std::vector<const CFGBlock *>::const_iterator

Definition at line 1393 of file CFG.h.

◆ try_block_range

using clang::CFG::try_block_range = llvm::iterator_range<try_block_iterator>

Definition at line 1394 of file CFG.h.

Constructor & Destructor Documentation

◆ CFG()

clang::CFG::CFG ( )

inline

Definition at line 1489 of file CFG.h.

Member Function Documentation

◆ addSyntheticDeclStmt()

void clang::CFG::addSyntheticDeclStmt	(	const DeclStmt *	Synthetic,
		const DeclStmt *	Source )

inline

Records a synthetic DeclStmt and the DeclStmt it was constructed from.

The CFG uses synthetic DeclStmts when a single AST DeclStmt contains multiple decls.

Definition at line 1416 of file CFG.h.

References clang::DeclStmt::isSingleDecl().

◆ addTryDispatchBlock()

void clang::CFG::addTryDispatchBlock ( const CFGBlock * block )

inline

Definition at line 1408 of file CFG.h.

◆ back()

CFGBlock & clang::CFG::back ( )

inline

Definition at line 1355 of file CFG.h.

References clang::CFGBlock::back().

Referenced by createBlock().

◆ begin() [1/2]

iterator clang::CFG::begin ( )

inline

Definition at line 1357 of file CFG.h.

References clang::CFGBlock::begin().

Referenced by const_nodes(), createBlock(), clang::CFGBlock::getIndexInCFG(), and nodes().

◆ begin() [2/2]

const_iterator clang::CFG::begin ( ) const

inline

Definition at line 1359 of file CFG.h.

References clang::CFGBlock::begin().

◆ buildCFG()

std::unique_ptr< CFG > CFG::buildCFG	(	const Decl *	D,
		Stmt *	AST,
		ASTContext *	C,
		const BuildOptions &	BO )

static

Builds a CFG from an AST.

buildCFG - Constructs a CFG from an AST.

Definition at line 5458 of file CFG.cpp.

References clang::C.

Referenced by clang::dataflow::AdornedCFG::build(), clang::AnalysisDeclContext::getCFG(), and clang::AnalysisDeclContext::getUnoptimizedCFG().

◆ const_nodes()

llvm::iterator_range< const_iterator > clang::CFG::const_nodes ( ) const

inline

Definition at line 1366 of file CFG.h.

References begin(), and end().

◆ const_reverse_nodes()

llvm::iterator_range< const_reverse_iterator > clang::CFG::const_reverse_nodes ( ) const

inline

Definition at line 1381 of file CFG.h.

References rbegin(), and rend().

◆ createBlock()

CFGBlock * CFG::createBlock ( )

Create a new block in the CFG.

createBlock - Constructs and adds a new CFGBlock to the CFG.

The CFG owns the block; the caller should not directly free it.

The block has no successors or predecessors. If this is the first block created in the CFG, it is automatically set to be the Entry and Exit of the CFG.

Definition at line 5442 of file CFG.cpp.

References back(), begin(), end(), and getAllocator().

◆ dump()

void CFG::dump	(	const LangOptions &	LO,
		bool	ShowColors ) const

dump - A simple pretty printer of a CFG that outputs to stderr.

Definition at line 6361 of file CFG.cpp.

References clang::CFGBlock::print().

Referenced by clang::lifetimes::internal::DebugOnlyFunction(), clang::AnalysisDeclContext::dumpCFG(), and clang::lifetimes::internal::LifetimeSafetyAnalysis::run().

◆ end() [1/2]

iterator clang::CFG::end ( )

inline

Definition at line 1358 of file CFG.h.

References clang::CFGBlock::end().

Referenced by const_nodes(), createBlock(), and nodes().

◆ end() [2/2]

const_iterator clang::CFG::end ( ) const

inline

Definition at line 1360 of file CFG.h.

References clang::CFGBlock::end().

◆ front()

CFGBlock & clang::CFG::front ( )

inline

Definition at line 1354 of file CFG.h.

References clang::CFGBlock::front().

◆ getAllocator()

llvm::BumpPtrAllocator & clang::CFG::getAllocator ( )

inline

Definition at line 1491 of file CFG.h.

Referenced by createBlock().

◆ getBumpVectorContext()

BumpVectorContext & clang::CFG::getBumpVectorContext ( )

inline

Definition at line 1495 of file CFG.h.

◆ getEntry() [1/2]

CFGBlock & clang::CFG::getEntry ( )

inline

◆ getEntry() [2/2]

const CFGBlock & clang::CFG::getEntry ( ) const

inline

Definition at line 1386 of file CFG.h.

◆ getExit() [1/2]

CFGBlock & clang::CFG::getExit ( )

inline

Definition at line 1387 of file CFG.h.

Referenced by CheckFallThrough(), checkForRecursiveFunctionCall(), checkRecursiveFunction(), checkThrowInNonThrowingFunc(), findBlockLocations(), clang::FunctionExitPoint::getBlock(), llvm::GraphTraits< Inverse< ::clang::CFG * > >::getEntryNode(), clang::ento::PathSensitiveBugReport::getStmt(), clang::CFGBlock::isInevitablySinking(), print(), print_block(), clang::ento::ExprEngine::processCallExit(), clang::consumed::ConsumedAnalyzer::run(), clang::lifetimes::internal::FactsGenerator::run(), and throwEscapes().

◆ getExit() [2/2]

const CFGBlock & clang::CFG::getExit ( ) const

inline

Definition at line 1388 of file CFG.h.

◆ getIndirectGotoBlock() [1/2]

CFGBlock * clang::CFG::getIndirectGotoBlock ( )

inline

Definition at line 1390 of file CFG.h.

Referenced by print_block().

◆ getIndirectGotoBlock() [2/2]

const CFGBlock * clang::CFG::getIndirectGotoBlock ( ) const

inline

Definition at line 1391 of file CFG.h.

◆ getNumBlockIDs()

unsigned clang::CFG::getNumBlockIDs ( ) const

inline

Returns the total number of BlockIDs allocated (which start at 0).

Definition at line 1464 of file CFG.h.

Referenced by clang::internal::buildInterval(), CheckFallThrough(), clang::LiveVariables::computeLiveness(), clang::ento::CoreEngine::ExecuteWorkList(), clang::lifetimes::internal::FactManager::FactManager(), clang::findCFGBackEdges(), clang::dataflow::findReachableBlocks(), clang::reachable_code::FindUnreachableCode(), clang::internal::partitionIntoIntervals(), clang::PostOrderCFGView::PostOrderCFGView(), clang::consumed::ConsumedAnalyzer::run(), clang::lifetimes::internal::LifetimeSafetyAnalysis::run(), clang::runUninitializedVariablesAnalysis(), throwEscapes(), and visitReachableThrows().

◆ isLinear()

bool CFG::isLinear ( ) const

Returns true if the CFG has no branches.

Usually it boils down to the CFG having exactly three blocks (entry, the actual code, exit), but sometimes more blocks appear due to having control flow that can be fully resolved in compile time.

Definition at line 5465 of file CFG.cpp.

References size(), and clang::CFGBlock::succs().

Referenced by clang::ento::NoStateChangeFuncVisitor::VisitNode().

◆ nodes()

llvm::iterator_range< iterator > clang::CFG::nodes ( )

inline

Definition at line 1365 of file CFG.h.

References begin(), and end().

Referenced by clang::LiveVariables::computeLiveness().

◆ nodes_begin() [1/2]

iterator clang::CFG::nodes_begin ( )

inline

Definition at line 1362 of file CFG.h.

Referenced by llvm::GraphTraits< ::clang::CFG * >::nodes_begin(), and llvm::GraphTraits< Inverse< ::clang::CFG * > >::nodes_begin().

◆ nodes_begin() [2/2]

const_iterator clang::CFG::nodes_begin ( ) const

inline

Definition at line 1370 of file CFG.h.

◆ nodes_end() [1/2]

iterator clang::CFG::nodes_end ( )

inline

Definition at line 1363 of file CFG.h.

Referenced by llvm::GraphTraits< ::clang::CFG * >::nodes_end(), and llvm::GraphTraits< Inverse< ::clang::CFG * > >::nodes_end().

◆ nodes_end() [2/2]

const_iterator clang::CFG::nodes_end ( ) const

inline

Definition at line 1371 of file CFG.h.

◆ print()

void CFG::print	(	raw_ostream &	OS,
		const LangOptions &	LO,
		bool	ShowColors ) const

print - A simple pretty printer of a CFG that outputs to an ostream.

Definition at line 6366 of file CFG.cpp.

References getEntry(), getExit(), and print_block().

◆ rbegin() [1/2]

reverse_iterator clang::CFG::rbegin ( )

inline

Definition at line 1373 of file CFG.h.

Referenced by const_reverse_nodes(), and reverse_nodes().

◆ rbegin() [2/2]

const_reverse_iterator clang::CFG::rbegin ( ) const

inline

Definition at line 1375 of file CFG.h.

◆ rend() [1/2]

reverse_iterator clang::CFG::rend ( )

inline

Definition at line 1374 of file CFG.h.

Referenced by const_reverse_nodes(), and reverse_nodes().

◆ rend() [2/2]

const_reverse_iterator clang::CFG::rend ( ) const

inline

Definition at line 1376 of file CFG.h.

◆ reverse_nodes()

llvm::iterator_range< reverse_iterator > clang::CFG::reverse_nodes ( )

inline

Definition at line 1378 of file CFG.h.

References rbegin(), and rend().

◆ setEntry()

void clang::CFG::setEntry ( CFGBlock * B )

inline

Set the entry block of the CFG.

This is typically used only during CFG construction. Most CFG clients expect that the entry block has no predecessors and contains no statements.

Definition at line 1338 of file CFG.h.

◆ setIndirectGotoBlock()

void clang::CFG::setIndirectGotoBlock ( CFGBlock * B )

inline

Set the block used for indirect goto jumps.

This is typically used only during CFG construction.

Definition at line 1342 of file CFG.h.

◆ size()

unsigned clang::CFG::size ( ) const

inline

Return the total number of CFGBlocks within the CFG This is simply a renaming of the getNumBlockIDs().

This is necessary because the dominator implementation needs such an interface.

Definition at line 1469 of file CFG.h.

Referenced by clang::getIntervalWTO(), isLinear(), clang::dataflow::NumReachableBlocks(), clang::dataflow::runTypeErasedDataflowAnalysis(), and llvm::GraphTraits< ::clang::CFG * >::size().

◆ synthetic_stmt_begin()

synthetic_stmt_iterator clang::CFG::synthetic_stmt_begin ( ) const

inline

Iterates over synthetic DeclStmts in the CFG.

Each element is a (synthetic statement, source statement) pair.

See also: addSyntheticDeclStmt

Definition at line 1433 of file CFG.h.

Referenced by addParentsForSyntheticStmts(), and synthetic_stmts().

◆ synthetic_stmt_end()

synthetic_stmt_iterator clang::CFG::synthetic_stmt_end ( ) const

inline

See also: synthetic_stmt_begin

Definition at line 1438 of file CFG.h.

Referenced by addParentsForSyntheticStmts(), and synthetic_stmts().

◆ synthetic_stmts()

synthetic_stmt_range clang::CFG::synthetic_stmts ( ) const

inline

See also: synthetic_stmt_begin

Definition at line 1443 of file CFG.h.

References synthetic_stmt_begin(), and synthetic_stmt_end().

◆ try_blocks()

try_block_range clang::CFG::try_blocks ( ) const

inline

Definition at line 1404 of file CFG.h.

References try_blocks_begin(), and try_blocks_end().

Referenced by clang::reachable_code::FindUnreachableCode().

◆ try_blocks_begin()

try_block_iterator clang::CFG::try_blocks_begin ( ) const

inline

Definition at line 1396 of file CFG.h.

Referenced by try_blocks().

◆ try_blocks_end()

try_block_iterator clang::CFG::try_blocks_end ( ) const

inline

Definition at line 1400 of file CFG.h.

Referenced by try_blocks().

◆ viewCFG()

void CFG::viewCFG ( const LangOptions & LO ) const

Definition at line 6591 of file CFG.cpp.

References GraphHelper.

◆ VisitBlockStmts()

template<typename Callback>

void clang::CFG::VisitBlockStmts ( Callback & O ) const

inline

Definition at line 1451 of file CFG.h.

References clang::ast_matchers::stmt.

Referenced by clang::runUninitializedVariablesAnalysis().

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

include/clang/Analysis/CFG.h
lib/Analysis/CFG.cpp

Classes

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Typedef Documentation

◆ CFGBlockListTy

◆ const_iterator

◆ const_reverse_iterator

◆ iterator

◆ reverse_iterator

◆ synthetic_stmt_iterator

◆ synthetic_stmt_range

◆ try_block_iterator

◆ try_block_range

Constructor & Destructor Documentation

◆ CFG()

Member Function Documentation

◆ addSyntheticDeclStmt()

◆ addTryDispatchBlock()

◆ back()

◆ begin() [1/2]

◆ begin() [2/2]

◆ buildCFG()

◆ const_nodes()

◆ const_reverse_nodes()

◆ createBlock()

◆ dump()

◆ end() [1/2]

◆ end() [2/2]

◆ front()

◆ getAllocator()

◆ getBumpVectorContext()

◆ getEntry() [1/2]

◆ getEntry() [2/2]

◆ getExit() [1/2]

◆ getExit() [2/2]

◆ getIndirectGotoBlock() [1/2]

◆ getIndirectGotoBlock() [2/2]

◆ getNumBlockIDs()

◆ isLinear()

◆ nodes()

◆ nodes_begin() [1/2]

◆ nodes_begin() [2/2]

◆ nodes_end() [1/2]

◆ nodes_end() [2/2]

◆ print()

◆ rbegin() [1/2]

◆ rbegin() [2/2]

◆ rend() [1/2]

◆ rend() [2/2]

◆ reverse_nodes()

◆ setEntry()

◆ setIndirectGotoBlock()

◆ size()

◆ synthetic_stmt_begin()

◆ synthetic_stmt_end()

◆ synthetic_stmts()

◆ try_blocks()

◆ try_blocks_begin()

◆ try_blocks_end()

◆ viewCFG()

◆ VisitBlockStmts()