height-state - Factor Documentation

height-state

Vocabulary
compiler.cfg.stacks.local

Word description
A tuple which keeps track of the stacks heights and increments of a basic-block during local analysis. The idea is that if the stack change instructions are tracked, then multiple changes can be folded into one. It has the following slots:

ds-begin	Datastack height at the beginning of the block.
rs-begin	Retainstack height at the beginning of the block.
ds-inc	Datastack change during the block.
rs-inc	Retainstack change during the block.

See also
inc-stack, reset-incs

Definition

IN: compiler.cfg.stacks.local

TUPLE: height-state ds-begin rs-begin ds-inc rs-inc ;