mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-22 18:40:25 +00:00
62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
package tengo
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/d5/tengo/v2/parser"
|
|
)
|
|
|
|
// MakeInstruction returns a bytecode for an opcode and the operands.
|
|
func MakeInstruction(opcode parser.Opcode, operands ...int) []byte {
|
|
numOperands := parser.OpcodeOperands[opcode]
|
|
|
|
totalLen := 1
|
|
for _, w := range numOperands {
|
|
totalLen += w
|
|
}
|
|
|
|
instruction := make([]byte, totalLen)
|
|
instruction[0] = opcode
|
|
|
|
offset := 1
|
|
for i, o := range operands {
|
|
width := numOperands[i]
|
|
switch width {
|
|
case 1:
|
|
instruction[offset] = byte(o)
|
|
case 2:
|
|
n := uint16(o)
|
|
instruction[offset] = byte(n >> 8)
|
|
instruction[offset+1] = byte(n)
|
|
}
|
|
offset += width
|
|
}
|
|
return instruction
|
|
}
|
|
|
|
// FormatInstructions returns string representation of bytecode instructions.
|
|
func FormatInstructions(b []byte, posOffset int) []string {
|
|
var out []string
|
|
|
|
i := 0
|
|
for i < len(b) {
|
|
numOperands := parser.OpcodeOperands[b[i]]
|
|
operands, read := parser.ReadOperands(numOperands, b[i+1:])
|
|
|
|
switch len(numOperands) {
|
|
case 0:
|
|
out = append(out, fmt.Sprintf("%04d %-7s",
|
|
posOffset+i, parser.OpcodeNames[b[i]]))
|
|
case 1:
|
|
out = append(out, fmt.Sprintf("%04d %-7s %-5d",
|
|
posOffset+i, parser.OpcodeNames[b[i]], operands[0]))
|
|
case 2:
|
|
out = append(out, fmt.Sprintf("%04d %-7s %-5d %-5d",
|
|
posOffset+i, parser.OpcodeNames[b[i]],
|
|
operands[0], operands[1]))
|
|
}
|
|
i += 1 + read
|
|
}
|
|
return out
|
|
}
|