mirror of
https://github.com/nspcc-dev/neo-go.git
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c1b6738bdb
* VM:Add abstract stack item * VM: Add stackItems; Array, Boolean, Int and ByteArray * VM: Add tests for stack item * VM: first pass at Random Access Stack object * VM: Add Sub, Mul, Mod LSH, RSH * VM: moved test helper functions into separate file * VM: removed helper functions from stack_test.go * Add conversions for bytearray and Int stack items * Add instructions file for vm * - Add guide to stack readme - Add testReadInt64 * Add Builder * Refactor Int, Boolean, ByteArray conversion * Add Context stack Item * Add Invocation stack - convenience RAS * rename testhelper to test_helper * Move opcode file * - Add `Add` OpCode - Add Opcode Function map * - Add test for math `Add` opcode - basic opcode execution * Add popTwoIntegers convenience func * Add `SUB` Opcode * Export Context Read methods - Return errors where failable * - Add `Op` to handleOP func signature - Add PushNBytes OPcode * remove error on NewBoolean - Expose underlying with Getter on Boolean StackItem - Add Equals method for ByteArray * Make Next() method on Context failable, refactor peekContext and Peek * Add ExecuteOp, Step and Run methods on the VM * Add Equal Opcode * Add THROWIFNOT Opcode * Add RET Opcode * Refactor PushNBytes Opcode * refactor Add, Sub to return VMSTATE add popTwoByteArrays helper function * Add basic tests for vm * clarify vm states * Add astack * [VM] Pass ResultStack to the opcode handlers * [VM] refactor handlers to have rstack as argument * [Stack] - Change RemoveCurrentContext for PopCurrentContext - Add CopTo method to stack * [VM] Add Result stack Len check in simple run test * [VM] fix typo * [Peer/Stall] Change seconds to milliseconds in test
61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
package stack
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import "errors"
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// Invocation embeds a Random Access stack
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// Providing helper methods for the context object
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type Invocation struct{ RandomAccess }
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//NewInvocation will return a new
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// Invocation stack
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func NewInvocation() *Invocation {
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return &Invocation{
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RandomAccess{
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vals: make([]Item, 0, StackAverageSize),
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},
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}
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}
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func (i *Invocation) peekContext(n uint16) (*Context, error) {
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item, err := i.Peek(n)
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if err != nil {
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return nil, err
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}
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return item.Context()
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}
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// CurrentContext returns the current context on the invocation stack
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func (i *Invocation) CurrentContext() (*Context, error) {
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return i.peekContext(0)
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}
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// PopCurrentContext Pops a context item from the top of the stack
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func (i *Invocation) PopCurrentContext() (*Context, error) {
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item, err := i.Pop()
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if err != nil {
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return nil, err
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}
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ctx, err := item.Context()
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if err != nil {
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return nil, err
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}
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return ctx, err
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}
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// CallingContext will return the cntext item
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// that will be called next.
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func (i *Invocation) CallingContext() (*Context, error) {
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if i.Len() < 1 {
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return nil, errors.New("Length of invocation stack is < 1, no calling context")
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}
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return i.peekContext(1)
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}
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// EntryContext will return the context item that
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// started the program
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func (i *Invocation) EntryContext() (*Context, error) {
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// firstItemIndex refers to the first item that was popped on the stack
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firstItemIndex := uint16(i.Len() - 1) // N.B. if this overflows because len is zero, then an error will be returned
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return i.peekContext(firstItemIndex)
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}
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