llvm::GCStrategy Class Reference

GCStrategy describes a garbage collector algorithm's code generation requirements, and provides overridable hooks for those needs which cannot be abstractly described. More...

#include "llvm/CodeGen/GCStrategy.h"

Collaboration diagram for llvm::GCStrategy:

Public Member Functions
	GCStrategy ()
virtual	~GCStrategy ()=default
const std::string &	getName () const
	Return the name of the GC strategy. More...
bool	useStatepoints () const
	Returns true if this strategy is expecting the use of gc.statepoints, and false otherwise. More...
Statepoint Specific Properties
virtual Optional< bool >	isGCManagedPointer (const Type *Ty) const
	If the type specified can be reliably distinguished, returns true for pointers to GC managed locations and false for pointers to non-GC managed locations. More...
GCRoot Specific Properties
These properties and overrides only apply to collector strategies using GCRoot.
bool	needsSafePoints () const
	True if safe points need to be inferred on call sites. More...
bool	usesMetadata () const
	If set, appropriate metadata tables must be emitted by the back-end (assembler, JIT, or otherwise). More...

Protected Attributes
bool	UseStatepoints = false
bool	NeededSafePoints = false
	Uses gc.statepoints as opposed to gc.roots, if set, none of the other options can be anything but their default values. More...
bool	UsesMetadata = false
	If set, backend must emit metadata tables. More...

Friends
class	GCModuleInfo

Detailed Description

GCStrategy describes a garbage collector algorithm's code generation requirements, and provides overridable hooks for those needs which cannot be abstractly described.

GCStrategy objects must be looked up through the Function. The objects themselves are owned by the Context and must be immutable.

Definition at line 67 of file GCStrategy.h.

Constructor & Destructor Documentation

GCStrategy()

GCStrategy::GCStrategy ( )

default

~GCStrategy()

virtual llvm::GCStrategy::~GCStrategy ( )

virtualdefault

Member Function Documentation

getName()

const std::string& llvm::GCStrategy::getName ( ) const

inline

Return the name of the GC strategy.

This is the value of the collector name string specified on functions which use this strategy.

Definition at line 87 of file GCStrategy.h.

References Name.

Referenced by EmitCamlGlobal(), and llvm::AsmPrinter::isBlockOnlyReachableByFallthrough().

isGCManagedPointer()

virtual Optional<bool> llvm::GCStrategy::isGCManagedPointer ( const Type *  Ty ) const

inlinevirtual

If the type specified can be reliably distinguished, returns true for pointers to GC managed locations and false for pointers to non-GC managed locations.

Note a GCStrategy can always return 'None' (i.e. an empty optional indicating it can't reliably distinguish.

Definition at line 100 of file GCStrategy.h.

References llvm::None.

Referenced by lowerStatepointMetaArgs().

needsSafePoints()

bool llvm::GCStrategy::needsSafePoints ( ) const

inline

True if safe points need to be inferred on call sites.

Definition at line 112 of file GCStrategy.h.

References NeededSafePoints.

usesMetadata()

bool llvm::GCStrategy::usesMetadata ( ) const

inline

If set, appropriate metadata tables must be emitted by the back-end (assembler, JIT, or otherwise).

For statepoint, this method is currently unsupported. The stackmap information can be found in the StackMap section as described in the documentation.

Definition at line 118 of file GCStrategy.h.

References UsesMetadata.

Referenced by llvm::AsmPrinter::isBlockOnlyReachableByFallthrough().

useStatepoints()

bool llvm::GCStrategy::useStatepoints ( ) const

inline

Returns true if this strategy is expecting the use of gc.statepoints, and false otherwise.

Definition at line 91 of file GCStrategy.h.

References UseStatepoints.

Friends And Related Function Documentation

GCModuleInfo

friend class GCModuleInfo

friend

Definition at line 69 of file GCStrategy.h.

Member Data Documentation

NeededSafePoints

bool llvm::GCStrategy::NeededSafePoints = false

protected

Uses gc.statepoints as opposed to gc.roots, if set, none of the other options can be anything but their default values.

if set, calls are inferred to be safepoints

Definition at line 78 of file GCStrategy.h.

Referenced by needsSafePoints().

UsesMetadata

bool llvm::GCStrategy::UsesMetadata = false

protected

If set, backend must emit metadata tables.

Definition at line 79 of file GCStrategy.h.

Referenced by usesMetadata().

UseStatepoints

bool llvm::GCStrategy::UseStatepoints = false

protected

Definition at line 74 of file GCStrategy.h.

Referenced by useStatepoints().

---

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

• include/llvm/CodeGen/GCStrategy.h
• lib/CodeGen/GCStrategy.cpp