38 lines
879 B
Go
38 lines
879 B
Go
package analysisutil
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import "golang.org/x/tools/go/ssa"
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// InspectInstr inspects from i-th instruction of start block to succsessor blocks.
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func InspectInstr(start *ssa.BasicBlock, i int, f func(i int, instr ssa.Instruction) bool) {
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new(instrInspector).block(start, i, f)
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}
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type instrInspector struct {
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done map[*ssa.BasicBlock]bool
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}
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func (ins *instrInspector) block(b *ssa.BasicBlock, i int, f func(i int, instr ssa.Instruction) bool) {
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if ins.done == nil {
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ins.done = map[*ssa.BasicBlock]bool{}
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}
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if b == nil || ins.done[b] || len(b.Instrs) <= i {
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return
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}
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ins.done[b] = true
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ins.instrs(i, b.Instrs[i:], f)
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for _, s := range b.Succs {
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ins.block(s, 0, f)
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}
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}
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func (ins *instrInspector) instrs(offset int, instrs []ssa.Instruction, f func(i int, instr ssa.Instruction) bool) {
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for i, instr := range instrs {
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if !f(offset+i, instr) {
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break
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}
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}
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}
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