435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
71 lines
1.1 KiB
Go
71 lines
1.1 KiB
Go
package irutil
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import (
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"honnef.co/go/tools/ir"
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)
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func Reachable(from, to *ir.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 *ir.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 *ir.BasicBlock, fn func(*ir.BasicBlock) bool) {
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seen := map[*ir.BasicBlock]bool{}
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wl := []*ir.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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func Vararg(x *ir.Slice) ([]ir.Value, bool) {
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var out []ir.Value
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slice, ok := x.X.(*ir.Alloc)
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if !ok {
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return nil, false
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}
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for _, ref := range *slice.Referrers() {
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if ref == x {
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continue
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}
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if ref.Block() != x.Block() {
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return nil, false
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}
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idx, ok := ref.(*ir.IndexAddr)
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if !ok {
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return nil, false
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}
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if len(*idx.Referrers()) != 1 {
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return nil, false
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}
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store, ok := (*idx.Referrers())[0].(*ir.Store)
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if !ok {
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return nil, false
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}
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out = append(out, store.Val)
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}
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return out, true
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}
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