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3c208088b6
The package currently implements the operations defined by https://www.kernel.org/doc/Documentation/networking/filter.txt , which comprises the base BPF virtual machine plus the Linux kernel's extension opcodes. Updates golang/go#14982 Change-Id: Iafb43d80e067040e60465a9bfb7d5f2ca90cc2ae Reviewed-on: https://go-review.googlesource.com/21212 Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package bpf
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import "fmt"
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// Assemble converts insts into raw instructions suitable for loading
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// into a BPF virtual machine.
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//
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// Currently, no optimization is attempted, the assembled program flow
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// is exactly as provided.
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func Assemble(insts []Instruction) ([]RawInstruction, error) {
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ret := make([]RawInstruction, len(insts))
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var err error
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for i, inst := range insts {
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ret[i], err = inst.Assemble()
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if err != nil {
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return nil, fmt.Errorf("assembling instruction %d: %s", i+1, err)
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}
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}
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return ret, nil
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}
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// Disassemble attempts to parse raw back into
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// Instructions. Unrecognized RawInstructions are assumed to be an
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// extension not implemented by this package, and are passed through
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// unchanged to the output. The allDecoded value reports whether insts
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// contains no RawInstructions.
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func Disassemble(raw []RawInstruction) (insts []Instruction, allDecoded bool) {
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insts = make([]Instruction, len(raw))
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allDecoded = true
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for i, r := range raw {
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insts[i] = r.Disassemble()
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if _, ok := insts[i].(RawInstruction); ok {
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allDecoded = false
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}
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}
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return insts, allDecoded
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}
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