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60 lines
1 KiB
Go
60 lines
1 KiB
Go
package quasigo
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import (
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"encoding/binary"
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"go/ast"
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"go/types"
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)
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func pickOp(cond bool, ifTrue, otherwise opcode) opcode {
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if cond {
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return ifTrue
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}
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return otherwise
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}
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func put16(code []byte, pos, value int) {
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binary.LittleEndian.PutUint16(code[pos:], uint16(value))
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}
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func decode16(code []byte, pos int) int {
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return int(int16(binary.LittleEndian.Uint16(code[pos:])))
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}
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func typeIsInt(typ types.Type) bool {
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basic, ok := typ.Underlying().(*types.Basic)
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if !ok {
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return false
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}
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switch basic.Kind() {
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case types.Int, types.UntypedInt:
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return true
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default:
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return false
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}
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}
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func typeIsString(typ types.Type) bool {
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basic, ok := typ.Underlying().(*types.Basic)
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if !ok {
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return false
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}
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return basic.Info()&types.IsString != 0
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}
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func walkBytecode(code []byte, fn func(pc int, op opcode)) {
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pc := 0
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for pc < len(code) {
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op := opcode(code[pc])
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fn(pc, op)
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pc += opcodeInfoTable[op].width
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}
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}
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func identName(n ast.Expr) string {
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id, ok := n.(*ast.Ident)
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if ok {
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return id.Name
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}
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return ""
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}
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