LLVM  4.0.0
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llvm::LazyCallGraph::SCC Class Reference

An SCC of the call graph. More...

#include <LazyCallGraph.h>

Public Types

typedef pointee_iterator
< SmallVectorImpl< Node * >
::const_iterator > 
iterator
 

Public Member Functions

iterator begin () const
 
iterator end () const
 
int size () const
 
RefSCCgetOuterRefSCC () const
 
bool isParentOf (const SCC &C) const
 Test if this SCC is a parent of C. More...
 
bool isAncestorOf (const SCC &C) const
 Test if this SCC is an ancestor of C. More...
 
bool isChildOf (const SCC &C) const
 Test if this SCC is a child of C. More...
 
bool isDescendantOf (const SCC &C) const
 Test if this SCC is a descendant of C. More...
 
std::string getName () const
 Provide a short name by printing this SCC to a std::string. More...
 

Friends

class LazyCallGraph
 
class LazyCallGraph::Node
 
raw_ostreamoperator<< (raw_ostream &OS, const SCC &C)
 Print a short descrtiption useful for debugging or logging. More...
 

Detailed Description

An SCC of the call graph.

This represents a Strongly Connected Component of the direct call graph – ignoring indirect calls and function references. It stores this as a collection of call graph nodes. While the order of nodes in the SCC is stable, it is not any particular order.

The SCCs are nested within a RefSCC, see below for details about that outer structure. SCCs do not support mutation of the call graph, that must be done through the containing RefSCC in order to fully reason about the ordering and connections of the graph.

Definition at line 365 of file LazyCallGraph.h.

Member Typedef Documentation

Definition at line 420 of file LazyCallGraph.h.

Member Function Documentation

iterator llvm::LazyCallGraph::SCC::begin ( ) const
inline
iterator llvm::LazyCallGraph::SCC::end ( ) const
inline
std::string llvm::LazyCallGraph::SCC::getName ( ) const
inline

Provide a short name by printing this SCC to a std::string.

This copes with the fact that we don't have a name per-se for an SCC while still making the use of this in debugging and logging useful.

Definition at line 459 of file LazyCallGraph.h.

References llvm::raw_ostream::flush().

RefSCC& llvm::LazyCallGraph::SCC::getOuterRefSCC ( ) const
inline
bool LazyCallGraph::SCC::isAncestorOf ( const SCC C) const

Test if this SCC is an ancestor of C.

Note that in the worst case this is linear in the number of edges departing the current SCC and every SCC in the entire graph reachable from this SCC. Thus this very well may walk every edge in the entire call graph! Do not call this in a tight loop!

Definition at line 207 of file LazyCallGraph.cpp.

References C, E, llvm::SmallVectorBase::empty(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::LazyCallGraph::lookupSCC(), N, llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back().

Referenced by isDescendantOf().

bool llvm::LazyCallGraph::SCC::isChildOf ( const SCC C) const
inline

Test if this SCC is a child of C.

See the comments for isParentOf for detailed notes about the complexity of this routine.

Definition at line 447 of file LazyCallGraph.h.

References isParentOf().

bool llvm::LazyCallGraph::SCC::isDescendantOf ( const SCC C) const
inline

Test if this SCC is a descendant of C.

See the comments for isParentOf for detailed notes about the complexity of this routine.

Definition at line 453 of file LazyCallGraph.h.

References isAncestorOf().

bool LazyCallGraph::SCC::isParentOf ( const SCC C) const

Test if this SCC is a parent of C.

Note that this is linear in the number of edges departing the current SCC.

Definition at line 193 of file LazyCallGraph.cpp.

References C, llvm::LazyCallGraph::Node::calls(), E, and N.

Referenced by isChildOf().

int llvm::LazyCallGraph::SCC::size ( ) const
inline

Friends And Related Function Documentation

friend class LazyCallGraph
friend

Definition at line 366 of file LazyCallGraph.h.

friend class LazyCallGraph::Node
friend

Definition at line 367 of file LazyCallGraph.h.

raw_ostream& operator<< ( raw_ostream OS,
const SCC C 
)
friend

Print a short descrtiption useful for debugging or logging.

We print the function names in the SCC wrapped in '()'s and skipping the middle functions if there are a large number.

Definition at line 388 of file LazyCallGraph.h.


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