govendor: Update 6 GCLOUD dependencies (#525)

* govendor: Update github.com/golang/protobuf

* govendor: Update github.com/gobwas/glob github.com/google/go-github

* govendor: Update 3 github.com/robertkrimen/otto

* govendor: Update 4 golang.org/x

golang.org/x/crypto
golang.org/x/net
golang.org/x/sys
golang.org/x/text
golang.org/x/time
golang.org/x/crypto

* govendor: Update 5 github.com/aws/aws-sdk-go

* govendor: Update 6 GCLOUD dependencies

vendor/honnef.co/go/tools/functions/loops.go

@@ -0,0 +1,54 @@
+package functions
+
+import "honnef.co/go/tools/ssa"
+
+type Loop struct{ ssa.BlockSet }
+
+func FindLoops(fn *ssa.Function) []Loop {
+	if fn.Blocks == nil {
+		return nil
+	}
+	tree := fn.DomPreorder()
+	var sets []Loop
+	for _, h := range tree {
+		for _, n := range h.Preds {
+			if !h.Dominates(n) {
+				continue
+			}
+			// n is a back-edge to h
+			// h is the loop header
+			if n == h {
+				set := Loop{}
+				set.Add(n)
+				sets = append(sets, set)
+				continue
+			}
+			set := Loop{}
+			set.Add(h)
+			set.Add(n)
+			for _, b := range allPredsBut(n, h, nil) {
+				set.Add(b)
+			}
+			sets = append(sets, set)
+		}
+	}
+	return sets
+}
+
+func allPredsBut(b, but *ssa.BasicBlock, list []*ssa.BasicBlock) []*ssa.BasicBlock {
+outer:
+	for _, pred := range b.Preds {
+		if pred == but {
+			continue
+		}
+		for _, p := range list {
+			// TODO improve big-o complexity of this function
+			if pred == p {
+				continue outer
+			}
+		}
+		list = append(list, pred)
+		list = allPredsBut(pred, but, list)
+	}
+	return list
+}

vendor/honnef.co/go/tools/functions/pure.go

@@ -0,0 +1,46 @@
+package functions
+
+import (
+	"honnef.co/go/tools/ssa"
+)
+
+func filterDebug(instr []ssa.Instruction) []ssa.Instruction {
+	var out []ssa.Instruction
+	for _, ins := range instr {
+		if _, ok := ins.(*ssa.DebugRef); !ok {
+			out = append(out, ins)
+		}
+	}
+	return out
+}
+
+// IsStub reports whether a function is a stub. A function is
+// considered a stub if it has no instructions or exactly one
+// instruction, which must be either returning only constant values or
+// a panic.
+func IsStub(fn *ssa.Function) bool {
+	if len(fn.Blocks) == 0 {
+		return true
+	}
+	if len(fn.Blocks) > 1 {
+		return false
+	}
+	instrs := filterDebug(fn.Blocks[0].Instrs)
+	if len(instrs) != 1 {
+		return false
+	}
+
+	switch instrs[0].(type) {
+	case *ssa.Return:
+		// Since this is the only instruction, the return value must
+		// be a constant. We consider all constants as stubs, not just
+		// the zero value. This does not, unfortunately, cover zero
+		// initialised structs, as these cause additional
+		// instructions.
+		return true
+	case *ssa.Panic:
+		return true
+	default:
+		return false
+	}
+}

vendor/honnef.co/go/tools/functions/terminates.go

@@ -0,0 +1,24 @@
+package functions
+
+import "honnef.co/go/tools/ssa"
+
+// Terminates reports whether fn is supposed to return, that is if it
+// has at least one theoretic path that returns from the function.
+// Explicit panics do not count as terminating.
+func Terminates(fn *ssa.Function) bool {
+	if fn.Blocks == nil {
+		// assuming that a function terminates is the conservative
+		// choice
+		return true
+	}
+
+	for _, block := range fn.Blocks {
+		if len(block.Instrs) == 0 {
+			continue
+		}
+		if _, ok := block.Instrs[len(block.Instrs)-1].(*ssa.Return); ok {
+			return true
+		}
+	}
+	return false
+}