tvm::ScopeStack< T > Class Template Reference

A scope stack for maintaining hierarchical state during IR visiting. More...

#include <scope_stack.h>

Collaboration diagram for tvm::ScopeStack< T >:

Public Member Functions
	ScopeStack ()
	Construct with one initial scope level.
size_t	size () const
	Return the number of active scopes.
bool	empty () const
	Return true if no scopes are active.
T &	Current ()
	Access the current (innermost) scope element.
const T &	Current () const
	Const access to the current (innermost) scope element.
template<typename F >
auto	WithNewScope (F &&body) -> decltype(body())
	Execute body within a new scope.

Detailed Description

template<typename T>
class tvm::ScopeStack< T >

A scope stack for maintaining hierarchical state during IR visiting.

During IR tree traversal, visitors often need to track scope-local state (e.g., active constraints, variable bindings) that should be automatically cleaned up when leaving a scope. ScopeStack provides this via WithNewScope, which pushes a new element on entry and pops it on exit.

ScopeStack<WithGroup<ConstraintContext>> constraints;
 
// In VisitStmt_(ForNode):
return constraints.WithNewScope([&]() -> Stmt {
  constraints.Current().Emplace(analyzer, condition);
  return StmtExprMutator::VisitStmt_(op);
});

Template Parameters

T	The element type stored on the stack. Must be default-constructible.

Constructor & Destructor Documentation

ScopeStack()

template<typename T >

tvm::ScopeStack< T >::ScopeStack ( )

inline

Construct with one initial scope level.

Member Function Documentation

Current() [1/2]

template<typename T >

T & tvm::ScopeStack< T >::Current ( )

inline

Access the current (innermost) scope element.

The returned reference is stable across push_back/pop_back because std::deque guarantees pointer stability for these operations.

Returns

Mutable reference to the top element.

Current() [2/2]

template<typename T >

const T & tvm::ScopeStack< T >::Current ( ) const

inline

Const access to the current (innermost) scope element.

empty()

template<typename T >

bool tvm::ScopeStack< T >::empty ( ) const

inline

Return true if no scopes are active.

size()

template<typename T >

size_t tvm::ScopeStack< T >::size ( ) const

inline

Return the number of active scopes.

WithNewScope()

template<typename T >

template<typename F >

auto tvm::ScopeStack< T >::WithNewScope ( F &&  body ) -> decltype(body())

inline

Execute body within a new scope.

Pushes a new T onto the stack, executes the body, then pops it.

Parameters

body	A callable to execute within the scope.

Returns

The return value of body(), if non-void.

---

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

• include/tvm/ir/scope_stack.h