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vm: do not copy parameter

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Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgeniy Stratonikov 2021-08-10 15:31:16 +03:00
parent a5516e8c96
commit f5d1277bfd
1 changed files with 4 additions and 5 deletions
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9
pkg/vm/context.go
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@ -97,9 +97,9 @@ func (c *Context) NextIP() int {
return c.nextip return c.nextip
} }
// Next returns the next instruction to execute with its parameter if any. After // Next returns the next instruction to execute with its parameter if any.
// its invocation the instruction pointer points to the instruction being // The parameter is not copied and shouldn't be written to. After its invocation
// returned. // the instruction pointer points to the instruction being returned.
func (c *Context) Next() (opcode.Opcode, []byte, error) { func (c *Context) Next() (opcode.Opcode, []byte, error) {
var err error var err error
@ -171,8 +171,7 @@ func (c *Context) Next() (opcode.Opcode, []byte, error) {
if err != nil { if err != nil {
return instr, nil, err return instr, nil, err
} }
parameter := make([]byte, numtoread) parameter := c.prog[c.nextip : c.nextip+numtoread]
copy(parameter, c.prog[c.nextip:c.nextip+numtoread])
c.nextip += numtoread c.nextip += numtoread
return instr, parameter, nil return instr, parameter, nil
} }