42 lines
626 B
Go
42 lines
626 B
Go
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package ssautil
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import (
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"honnef.co/go/tools/ssa"
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)
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func Reachable(from, to *ssa.BasicBlock) bool {
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if from == to {
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return true
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}
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if from.Dominates(to) {
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return true
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}
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found := false
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Walk(from, func(b *ssa.BasicBlock) bool {
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if b == to {
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found = true
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return false
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}
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return true
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})
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return found
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}
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func Walk(b *ssa.BasicBlock, fn func(*ssa.BasicBlock) bool) {
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seen := map[*ssa.BasicBlock]bool{}
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wl := []*ssa.BasicBlock{b}
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for len(wl) > 0 {
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b := wl[len(wl)-1]
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wl = wl[:len(wl)-1]
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if seen[b] {
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continue
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}
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seen[b] = true
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if !fn(b) {
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continue
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}
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wl = append(wl, b.Succs...)
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}
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}
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