mirror of
https://github.com/woodpecker-ci/woodpecker.git
synced 2024-12-12 03:26:30 +00:00
74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package quasigo
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import (
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"fmt"
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"strings"
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)
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// TODO(quasilyte): generate extra opcode info so we can simplify disasm function?
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func disasm(env *Env, fn *Func) string {
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var out strings.Builder
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dbg, ok := env.debug.funcs[fn]
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if !ok {
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return "<unknown>\n"
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}
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code := fn.code
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labels := map[int]string{}
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walkBytecode(code, func(pc int, op opcode) {
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switch op {
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case opJumpTrue, opJumpFalse, opJump:
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offset := decode16(code, pc+1)
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targetPC := pc + offset
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if _, ok := labels[targetPC]; !ok {
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labels[targetPC] = fmt.Sprintf("L%d", len(labels))
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}
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}
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})
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walkBytecode(code, func(pc int, op opcode) {
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if l := labels[pc]; l != "" {
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fmt.Fprintf(&out, "%s:\n", l)
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}
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var arg interface{}
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var comment string
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switch op {
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case opCallNative:
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id := decode16(code, pc+1)
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arg = id
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comment = env.nativeFuncs[id].name
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case opPushParam, opPushIntParam:
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index := int(code[pc+1])
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arg = index
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comment = dbg.paramNames[index]
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case opSetLocal, opSetIntLocal, opPushLocal, opPushIntLocal, opIncLocal, opDecLocal:
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index := int(code[pc+1])
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arg = index
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comment = dbg.localNames[index]
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case opPushConst:
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arg = int(code[pc+1])
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comment = fmt.Sprintf("value=%#v", fn.constants[code[pc+1]])
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case opPushIntConst:
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arg = int(code[pc+1])
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comment = fmt.Sprintf("value=%#v", fn.intConstants[code[pc+1]])
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case opJumpTrue, opJumpFalse, opJump:
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offset := decode16(code, pc+1)
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targetPC := pc + offset
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arg = offset
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comment = labels[targetPC]
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}
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if comment != "" {
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comment = " # " + comment
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}
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if arg == nil {
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fmt.Fprintf(&out, " %s%s\n", op, comment)
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} else {
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fmt.Fprintf(&out, " %s %#v%s\n", op, arg, comment)
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}
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})
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return out.String()
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}
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