Halide::Internal::IRNode Struct Reference

The abstract base classes for a node in the Halide IR. More...

#include <Expr.h>

Inheritance diagram for Halide::Internal::IRNode:

Public Member Functions
virtual void	accept (IRVisitor *v) const =0
	We use the visitor pattern to traverse IR nodes throughout the compiler, so we have a virtual accept method which accepts visitors.
	IRNode (IRNodeType t)
virtual	~IRNode ()=default

Public Attributes
RefCount	ref_count
	These classes are all managed with intrusive reference counting, so we also track a reference count.
IRNodeType	node_type
	Each IR node subclass has a unique identifier.

Detailed Description

The abstract base classes for a node in the Halide IR.

Definition at line 84 of file Expr.h.

Constructor & Destructor Documentation

IRNode()

Halide::Internal::IRNode::IRNode ( IRNodeType t )

inline

Definition at line 91 of file Expr.h.

~IRNode()

virtual Halide::Internal::IRNode::~IRNode ( )

virtualdefault

Member Function Documentation

accept()

virtual void Halide::Internal::IRNode::accept ( IRVisitor * v ) const

pure virtual

We use the visitor pattern to traverse IR nodes throughout the compiler, so we have a virtual accept method which accepts visitors.

Implemented in Halide::Internal::ExprNode< T >, Halide::Internal::ExprNode< Add >, Halide::Internal::ExprNode< And >, Halide::Internal::ExprNode< Broadcast >, Halide::Internal::ExprNode< Call >, Halide::Internal::ExprNode< Cast >, Halide::Internal::ExprNode< Div >, Halide::Internal::ExprNode< EQ >, Halide::Internal::ExprNode< FloatImm >, Halide::Internal::ExprNode< GE >, Halide::Internal::ExprNode< GT >, Halide::Internal::ExprNode< IntImm >, Halide::Internal::ExprNode< LE >, Halide::Internal::ExprNode< Let >, Halide::Internal::ExprNode< Load >, Halide::Internal::ExprNode< LT >, Halide::Internal::ExprNode< Max >, Halide::Internal::ExprNode< Min >, Halide::Internal::ExprNode< Mod >, Halide::Internal::ExprNode< Mul >, Halide::Internal::ExprNode< NE >, Halide::Internal::ExprNode< Not >, Halide::Internal::ExprNode< Or >, Halide::Internal::ExprNode< Ramp >, Halide::Internal::ExprNode< Reinterpret >, Halide::Internal::ExprNode< Select >, Halide::Internal::ExprNode< Shuffle >, Halide::Internal::ExprNode< StringImm >, Halide::Internal::ExprNode< Sub >, Halide::Internal::ExprNode< UIntImm >, Halide::Internal::ExprNode< Variable >, Halide::Internal::ExprNode< VectorReduce >, Halide::Internal::StmtNode< T >, Halide::Internal::StmtNode< Acquire >, Halide::Internal::StmtNode< Allocate >, Halide::Internal::StmtNode< AssertStmt >, Halide::Internal::StmtNode< Atomic >, Halide::Internal::StmtNode< Block >, Halide::Internal::StmtNode< Evaluate >, Halide::Internal::StmtNode< For >, Halide::Internal::StmtNode< Fork >, Halide::Internal::StmtNode< Free >, Halide::Internal::StmtNode< HoistedStorage >, Halide::Internal::StmtNode< IfThenElse >, Halide::Internal::StmtNode< LetStmt >, Halide::Internal::StmtNode< Prefetch >, Halide::Internal::StmtNode< ProducerConsumer >, Halide::Internal::StmtNode< Provide >, Halide::Internal::StmtNode< Realize >, and Halide::Internal::StmtNode< Store >.

Referenced by Halide::Internal::IRHandle::accept().

Member Data Documentation

ref_count

RefCount Halide::Internal::IRNode::ref_count

mutable

These classes are all managed with intrusive reference counting, so we also track a reference count.

It's mutable so that we can do reference counting even through const references to IR nodes.

Definition at line 101 of file Expr.h.

node_type

IRNodeType Halide::Internal::IRNode::node_type

Each IR node subclass has a unique identifier.

We can compare these values to do runtime type identification. We don't compile with rtti because that injects run-time type identification stuff everywhere (and often breaks when linking external libraries compiled without it), and we only want it for IR nodes. One might want to put this value in the vtable, but that adds another level of indirection, and for Exprs we have 32 free bits in between the ref count and the Type anyway, so this doesn't increase the memory footprint of an IR node.

Definition at line 113 of file Expr.h.

Referenced by Halide::Internal::IRHandle::as(), Halide::Internal::equal(), Halide::Internal::graph_equal(), Halide::Internal::graph_less_than(), Halide::Internal::less_than(), Halide::Internal::IRMatcher::IntLiteral::match(), Halide::Internal::IRMatcher::WildConst< i >::match(), Halide::Internal::IRMatcher::WildConstFloat< i >::match(), Halide::Internal::IRMatcher::WildConstInt< i >::match(), Halide::Internal::IRMatcher::WildConstUInt< i >::match(), and Halide::Internal::IRHandle::node_type().

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The documentation for this struct was generated from the following file:

• src/Expr.h