73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package vrp
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import (
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"fmt"
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"honnef.co/go/tools/ssa"
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)
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type ChannelInterval struct {
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Size IntInterval
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}
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func (c ChannelInterval) Union(other Range) Range {
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i, ok := other.(ChannelInterval)
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if !ok {
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i = ChannelInterval{EmptyIntInterval}
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}
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if c.Size.Empty() || !c.Size.IsKnown() {
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return i
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}
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if i.Size.Empty() || !i.Size.IsKnown() {
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return c
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}
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return ChannelInterval{
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Size: c.Size.Union(i.Size).(IntInterval),
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}
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}
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func (c ChannelInterval) String() string {
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return c.Size.String()
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}
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func (c ChannelInterval) IsKnown() bool {
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return c.Size.IsKnown()
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}
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type MakeChannelConstraint struct {
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aConstraint
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Buffer ssa.Value
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}
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type ChannelChangeTypeConstraint struct {
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aConstraint
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X ssa.Value
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}
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func NewMakeChannelConstraint(buffer, y ssa.Value) Constraint {
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return &MakeChannelConstraint{NewConstraint(y), buffer}
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}
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func NewChannelChangeTypeConstraint(x, y ssa.Value) Constraint {
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return &ChannelChangeTypeConstraint{NewConstraint(y), x}
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}
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func (c *MakeChannelConstraint) Operands() []ssa.Value { return []ssa.Value{c.Buffer} }
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func (c *ChannelChangeTypeConstraint) Operands() []ssa.Value { return []ssa.Value{c.X} }
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func (c *MakeChannelConstraint) String() string {
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return fmt.Sprintf("%s = make(chan, %s)", c.Y().Name(), c.Buffer.Name())
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}
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func (c *ChannelChangeTypeConstraint) String() string {
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return fmt.Sprintf("%s = changetype(%s)", c.Y().Name(), c.X.Name())
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}
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func (c *MakeChannelConstraint) Eval(g *Graph) Range {
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i, ok := g.Range(c.Buffer).(IntInterval)
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if !ok {
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return ChannelInterval{NewIntInterval(NewZ(0), PInfinity)}
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}
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if i.Lower.Sign() == -1 {
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i.Lower = NewZ(0)
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}
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return ChannelInterval{i}
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}
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func (c *ChannelChangeTypeConstraint) Eval(g *Graph) Range { return g.Range(c.X) }
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