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Add astack

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This commit is contained in:
BlockChainDev 2019-03-17 22:57:36 +00:00
parent 9e16bac7d8
commit 351f0acdfe
1 changed files with 5 additions and 3 deletions
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8
pkg/vm/stack/context.go
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@ -6,8 +6,7 @@ import (
) )
// Context represent the current execution context of the VM. // Context represent the current execution context of the VM.
// context will be treated as stack item // context will be treated as stack item and placed onto the invocation stack
// and placed onto the invocation stack
type Context struct { type Context struct {
*abstractItem *abstractItem
@ -22,6 +21,9 @@ type Context struct {
// Evaluation Stack // Evaluation Stack
Estack RandomAccess Estack RandomAccess
// Alternative Stack
Astack RandomAccess
} }
// NewContext return a new Context object. // NewContext return a new Context object.
@ -44,7 +46,7 @@ func (c *Context) Context() (*Context, error) {
func (c *Context) Next() (Instruction, error) { func (c *Context) Next() (Instruction, error) {
c.ip++ c.ip++
if c.ip >= len(c.prog) { if c.ip >= len(c.prog) {
return RET, errors.New("program pointer is more than the length of program. RETURNING") return RET, errors.New("program pointer is more than the length of program. Returning RET OPCODE")
} }
return Instruction(c.prog[c.ip]), nil return Instruction(c.prog[c.ip]), nil
} }