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vm: allow to call VM methods from outside

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Abstract out (*VM).Call method and use in in CALL* opcodes.
This commit is contained in:
Evgenii Stratonikov 2020-07-24 11:56:35 +03:00
parent 6ecd1ae437
commit 13b9eda08d
1 changed files with 14 additions and 12 deletions
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26
pkg/vm/vm.go
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@ -1235,13 +1235,9 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
case opcode.CALL, opcode.CALLL:
v.checkInvocationStackSize()
newCtx := ctx.Copy()
newCtx.local = nil
newCtx.arguments = nil
v.istack.PushVal(newCtx)
offset := v.getJumpOffset(newCtx, parameter)
v.Jump(newCtx, offset)
// Note: jump offset must be calculated regarding to new context,
// but it is cloned and thus has the same script and instruction pointer.
v.Call(ctx, v.getJumpOffset(ctx, parameter))
case opcode.CALLA:
ptr := v.estack.Pop().Item().(*stackitem.Pointer)
@ -1249,11 +1245,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
panic("invalid script in pointer")
}
newCtx := ctx.Copy()
newCtx.local = nil
newCtx.arguments = nil
v.istack.PushVal(newCtx)
v.Jump(newCtx, ptr.Position())
v.Call(ctx, ptr.Position())
case opcode.SYSCALL:
interopID := GetInteropID(parameter)
@ -1471,6 +1463,16 @@ func (v *VM) Jump(ctx *Context, offset int) {
ctx.nextip = offset
}
// Call calls method by offset. It is similar to Jump but also
// pushes new context to the invocation state
func (v *VM) Call(ctx *Context, offset int) {
newCtx := ctx.Copy()
newCtx.local = nil
newCtx.arguments = nil
v.istack.PushVal(newCtx)
v.Jump(newCtx, offset)
}
// getJumpOffset returns instruction number in a current context
// to a which JMP should be performed.
// parameter should have length either 1 or 4 and