152 lines
4.0 KiB
Go
152 lines
4.0 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pointer
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import (
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"golang.org/x/tools/go/types"
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)
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type constraint interface {
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// For a complex constraint, returns the nodeid of the pointer
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// to which it is attached. For addr and copy, returns dst.
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ptr() nodeid
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// renumber replaces each nodeid n in the constraint by mapping[n].
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renumber(mapping []nodeid)
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// presolve is a hook for constraint-specific behaviour during
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// pre-solver optimization. Typical implementations mark as
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// indirect the set of nodes to which the solver will add copy
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// edges or PTS labels.
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presolve(h *hvn)
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// solve is called for complex constraints when the pts for
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// the node to which they are attached has changed.
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solve(a *analysis, delta *nodeset)
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String() string
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}
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// dst = &src
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// pts(dst) ⊇ {src}
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// A base constraint used to initialize the solver's pt sets
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type addrConstraint struct {
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dst nodeid // (ptr)
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src nodeid
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}
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func (c *addrConstraint) ptr() nodeid { return c.dst }
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func (c *addrConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// dst = src
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// A simple constraint represented directly as a copyTo graph edge.
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type copyConstraint struct {
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dst nodeid // (ptr)
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src nodeid
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}
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func (c *copyConstraint) ptr() nodeid { return c.dst }
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func (c *copyConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// dst = src[offset]
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// A complex constraint attached to src (the pointer)
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type loadConstraint struct {
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offset uint32
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dst nodeid
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src nodeid // (ptr)
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}
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func (c *loadConstraint) ptr() nodeid { return c.src }
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func (c *loadConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// dst[offset] = src
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// A complex constraint attached to dst (the pointer)
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type storeConstraint struct {
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offset uint32
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dst nodeid // (ptr)
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src nodeid
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}
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func (c *storeConstraint) ptr() nodeid { return c.dst }
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func (c *storeConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// dst = &src.f or dst = &src[0]
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// A complex constraint attached to dst (the pointer)
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type offsetAddrConstraint struct {
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offset uint32
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dst nodeid
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src nodeid // (ptr)
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}
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func (c *offsetAddrConstraint) ptr() nodeid { return c.src }
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func (c *offsetAddrConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// dst = src.(typ) where typ is an interface
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// A complex constraint attached to src (the interface).
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// No representation change: pts(dst) and pts(src) contains tagged objects.
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type typeFilterConstraint struct {
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typ types.Type // an interface type
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dst nodeid
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src nodeid // (ptr)
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}
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func (c *typeFilterConstraint) ptr() nodeid { return c.src }
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func (c *typeFilterConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// dst = src.(typ) where typ is a concrete type
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// A complex constraint attached to src (the interface).
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//
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// If exact, only tagged objects identical to typ are untagged.
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// If !exact, tagged objects assignable to typ are untagged too.
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// The latter is needed for various reflect operators, e.g. Send.
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//
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// This entails a representation change:
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// pts(src) contains tagged objects,
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// pts(dst) contains their payloads.
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type untagConstraint struct {
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typ types.Type // a concrete type
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dst nodeid
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src nodeid // (ptr)
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exact bool
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}
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func (c *untagConstraint) ptr() nodeid { return c.src }
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func (c *untagConstraint) renumber(mapping []nodeid) {
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c.dst = mapping[c.dst]
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c.src = mapping[c.src]
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}
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// src.method(params...)
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// A complex constraint attached to iface.
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type invokeConstraint struct {
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method *types.Func // the abstract method
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iface nodeid // (ptr) the interface
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params nodeid // the start of the identity/params/results block
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}
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func (c *invokeConstraint) ptr() nodeid { return c.iface }
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func (c *invokeConstraint) renumber(mapping []nodeid) {
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c.iface = mapping[c.iface]
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c.params = mapping[c.params]
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}
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