vm

package
v0.73.1-pre Latest Latest
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 Go to latest Published: Feb 19, 2020 License: MIT Imports: 22 Imported by: 0

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Constants

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const (
	// MaxArraySize is the maximum array size allowed in the VM.
	MaxArraySize = 1024

	// MaxItemSize is the maximum item size allowed in the VM.
	MaxItemSize = 1024 * 1024

	// MaxInvocationStackSize is the maximum size of an invocation stack.
	MaxInvocationStackSize = 1024

	// MaxBigIntegerSizeBits is the maximum size of BigInt item in bits.
	MaxBigIntegerSizeBits = 32 * 8

	// MaxStackSize is the maximum number of items allowed to be
	// on all stacks at once.
	MaxStackSize = 2 * 1024
)

Variables

This section is empty.

Functions

func EncodeBinaryStackItem added in v0.70.0 

func EncodeBinaryStackItem(item StackItem, w *io.BinWriter)

EncodeBinaryStackItem encodes given StackItem into the given BinWriter. It's similar to io.Serializable's EncodeBinary, but works with StackItem interface.

func EnumeratorConcat added in v0.71.0 

func EnumeratorConcat(v *VM) error

EnumeratorConcat handles syscall Neo.Enumerator.Concat.

func EnumeratorCreate added in v0.71.0 

func EnumeratorCreate(v *VM) error

EnumeratorCreate handles syscall Neo.Enumerator.Create.

func EnumeratorNext added in v0.71.0 

func EnumeratorNext(v *VM) error

EnumeratorNext handles syscall Neo.Enumerator.Next.

func EnumeratorValue added in v0.71.0 

func EnumeratorValue(v *VM) error

EnumeratorValue handles syscall Neo.Enumerator.Value.

func GetInteropID added in v0.72.0 

func GetInteropID(parameter []byte) uint32

GetInteropID converts instruction parameter to an interop ID.

func InteropNameToID added in v0.71.0 

func InteropNameToID(name []byte) uint32

InteropNameToID returns an identificator of the method based on its name.

func IsMultiSigContract added in v0.51.0 

func IsMultiSigContract(script []byte) bool

IsMultiSigContract checks whether the passed script is a multi-signature contract.

func IsSignatureContract added in v0.51.0 

func IsSignatureContract(script []byte) bool

IsSignatureContract checks whether the passed script is a signature check contract.

func IsStandardContract added in v0.51.0 

func IsStandardContract(script []byte) bool

IsStandardContract checks whether the passed script is a signature or multi-signature contract.

func IteratorConcat added in v0.71.0 

func IteratorConcat(v *VM) error

IteratorConcat handles syscall Neo.Iterator.Concat.

func IteratorCreate added in v0.71.0 

func IteratorCreate(v *VM) error

IteratorCreate handles syscall Neo.Iterator.Create.

func IteratorKey added in v0.71.0 

func IteratorKey(v *VM) error

IteratorKey handles syscall Neo.Iterator.Key.

func IteratorKeys added in v0.71.0 

func IteratorKeys(v *VM) error

IteratorKeys handles syscall Neo.Iterator.Keys.

func IteratorValues added in v0.71.0 

func IteratorValues(v *VM) error

IteratorValues handles syscall Neo.Iterator.Values.

func RuntimeDeserialize added in v0.62.0 

func RuntimeDeserialize(vm *VM) error

RuntimeDeserialize handles syscalls System.Runtime.Deserialize and Neo.Runtime.Deserialize.

func RuntimeSerialize added in v0.62.0 

func RuntimeSerialize(vm *VM) error

RuntimeSerialize handles syscalls System.Runtime.Serialize and Neo.Runtime.Serialize.

func SerializeItem added in v0.72.1 

func SerializeItem(item StackItem) ([]byte, error)

SerializeItem encodes given StackItem into the byte slice.

Types

type ArrayItem 

type ArrayItem struct {
	// contains filtered or unexported fields
}

ArrayItem represents a new ArrayItem object.

func NewArrayItem 

func NewArrayItem(items []StackItem) *ArrayItem

NewArrayItem returns a new ArrayItem object.

func (*ArrayItem) Dup added in v0.71.0 

func (i *ArrayItem) Dup() StackItem

Dup implements StackItem interface.

func (*ArrayItem) MarshalJSON 

func (i *ArrayItem) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*ArrayItem) String 

func (i *ArrayItem) String() string

func (*ArrayItem) Value 

func (i *ArrayItem) Value() interface{}

Value implements StackItem interface.

type BigIntegerItem 

type BigIntegerItem struct {
	// contains filtered or unexported fields
}

BigIntegerItem represents a big integer on the stack.

func NewBigIntegerItem 

func NewBigIntegerItem(value int) *BigIntegerItem

NewBigIntegerItem returns an new BigIntegerItem object.

func (*BigIntegerItem) Bytes added in v0.62.0 

func (i *BigIntegerItem) Bytes() []byte

Bytes converts i to a slice of bytes.

func (*BigIntegerItem) Dup added in v0.71.0 

func (i *BigIntegerItem) Dup() StackItem

Dup implements StackItem interface.

func (*BigIntegerItem) MarshalJSON 

func (i *BigIntegerItem) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*BigIntegerItem) String 

func (i *BigIntegerItem) String() string

func (*BigIntegerItem) Value 

func (i *BigIntegerItem) Value() interface{}

Value implements StackItem interface.

type BoolItem 

type BoolItem struct {
	// contains filtered or unexported fields
}

BoolItem represents a boolean StackItem.

func NewBoolItem 

func NewBoolItem(val bool) *BoolItem

NewBoolItem returns an new BoolItem object.

func (*BoolItem) Dup added in v0.71.0 

func (i *BoolItem) Dup() StackItem

Dup implements StackItem interface.

func (*BoolItem) MarshalJSON 

func (i *BoolItem) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*BoolItem) String 

func (i *BoolItem) String() string

func (*BoolItem) Value 

func (i *BoolItem) Value() interface{}

Value implements StackItem interface.

type ByteArrayItem 

type ByteArrayItem struct {
	// contains filtered or unexported fields
}

ByteArrayItem represents a byte array on the stack.

func NewByteArrayItem 

func NewByteArrayItem(b []byte) *ByteArrayItem

NewByteArrayItem returns an new ByteArrayItem object.

func (*ByteArrayItem) Dup added in v0.71.0 

func (i *ByteArrayItem) Dup() StackItem

Dup implements StackItem interface.

func (*ByteArrayItem) MarshalJSON 

func (i *ByteArrayItem) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*ByteArrayItem) String 

func (i *ByteArrayItem) String() string

func (*ByteArrayItem) Value 

func (i *ByteArrayItem) Value() interface{}

Value implements StackItem interface.

type Context 

type Context struct {
	// contains filtered or unexported fields
}

Context represents the current execution context of the VM.

func NewContext 

func NewContext(b []byte) *Context

NewContext returns a new Context object.

func (*Context) Copy 

func (c *Context) Copy() *Context

Copy returns an new exact copy of c.

func (*Context) CurrInstr 

func (c *Context) CurrInstr() (int, opcode.Opcode)

CurrInstr returns the current instruction and opcode.

func (*Context) Dup added in v0.71.0 

func (c *Context) Dup() StackItem

Dup implements StackItem interface.

func (*Context) IP 

func (c *Context) IP() int

IP returns the absolute instruction without taking 0 into account. If that program starts the ip = 0 but IP() will return 1, cause its the first instruction.

func (*Context) LenInstr 

func (c *Context) LenInstr() int

LenInstr returns the number of instructions loaded.

func (*Context) Next 

func (c *Context) Next() (opcode.Opcode, []byte, error)

Next returns the next instruction to execute with its parameter if any. After its invocation the instruction pointer points to the instruction being returned.

func (*Context) NextIP added in v0.73.0 

func (c *Context) NextIP() int

NextIP returns next instruction pointer.

func (*Context) Program 

func (c *Context) Program() []byte

Program returns the loaded program.

func (*Context) ScriptHash added in v0.70.1 

func (c *Context) ScriptHash() util.Uint160

ScriptHash returns a hash of the script in the current context.

func (*Context) String 

func (c *Context) String() string

func (*Context) Value 

func (c *Context) Value() interface{}

Value implements StackItem interface.

type Element 

type Element struct {
	// contains filtered or unexported fields
}

Element represents an element in the double linked list (the stack), which will hold the underlying StackItem.

func NewElement 

func NewElement(v interface{}) *Element

NewElement returns a new Element object, with its underlying value inferred to the corresponding type.

func (*Element) Array 

func (e *Element) Array() []StackItem

Array attempts to get the underlying value of the element as an array of other items. Will panic if the item type is different which will be caught by the VM.

func (*Element) BigInt 

func (e *Element) BigInt() *big.Int

BigInt attempts to get the underlying value of the element as a big integer. Will panic if the assertion failed which will be caught by the VM.

func (*Element) Bool 

func (e *Element) Bool() bool

Bool attempts to get the underlying value of the element as a boolean. Will panic if the assertion failed which will be caught by the VM.

func (*Element) Bytes 

func (e *Element) Bytes() []byte

Bytes attempts to get the underlying value of the element as a byte array. Will panic if the assertion failed which will be caught by the VM.

func (*Element) Interop added in v0.71.0 

func (e *Element) Interop() *InteropItem

Interop attempts to get the underlying value of the element as an interop item.

func (*Element) Item added in v0.70.0 

func (e *Element) Item() StackItem

Item returns StackItem contained in the element.

func (*Element) Next 

func (e *Element) Next() *Element

Next returns the next element in the stack.

func (*Element) Prev 

func (e *Element) Prev() *Element

Prev returns the previous element in the stack.

func (*Element) TryBool added in v0.51.0 

func (e *Element) TryBool() (bool, error)

TryBool attempts to get the underlying value of the element as a boolean. Returns error if can't convert value to boolean type.

func (*Element) Value added in v0.51.0 

func (e *Element) Value() interface{}

Value returns value of the StackItem contained in the element.

type InteropFunc 

type InteropFunc func(vm *VM) error

InteropFunc allows to hook into the VM.

type InteropFuncPrice added in v0.51.0 

type InteropFuncPrice struct {
	Func  InteropFunc
	Price int
}

InteropFuncPrice represents an interop function with a price.

type InteropGetterFunc added in v0.71.0 

type InteropGetterFunc func(uint32) *InteropFuncPrice

InteropGetterFunc is a function that returns an interop function-price structure by the given interop ID.

type InteropItem added in v0.51.0 

type InteropItem struct {
	// contains filtered or unexported fields
}

InteropItem represents interop data on the stack.

func NewInteropItem added in v0.51.0 

func NewInteropItem(value interface{}) *InteropItem

NewInteropItem returns new InteropItem object.

func NewMapIterator added in v0.71.0 

func NewMapIterator(m map[interface{}]StackItem) *InteropItem

NewMapIterator returns new interop item containing iterator over m.

func (*InteropItem) Dup added in v0.71.0 

func (i *InteropItem) Dup() StackItem

Dup implements StackItem interface.

func (*InteropItem) MarshalJSON added in v0.51.0 

func (i *InteropItem) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*InteropItem) String added in v0.51.0 

func (i *InteropItem) String() string

String implements stringer interface.

func (*InteropItem) Value added in v0.51.0 

func (i *InteropItem) Value() interface{}

Value implements StackItem interface.

type MapItem added in v0.51.0 

type MapItem struct {
	// contains filtered or unexported fields
}

MapItem represents Map object.

func NewMapItem added in v0.51.0 

func NewMapItem() *MapItem

NewMapItem returns new MapItem object.

func (*MapItem) Add added in v0.51.0 

func (i *MapItem) Add(key, value StackItem)

Add adds key-value pair to the map.

func (*MapItem) Dup added in v0.71.0 

func (i *MapItem) Dup() StackItem

Dup implements StackItem interface.

func (*MapItem) Has added in v0.51.0 

func (i *MapItem) Has(key StackItem) (ok bool)

Has checks if map has specified key.

func (*MapItem) String added in v0.51.0 

func (i *MapItem) String() string

MarshalJSON implements the json.Marshaler interface.

func (*MapItem) Value added in v0.51.0 

func (i *MapItem) Value() interface{}

Value implements StackItem interface.

type Stack 

type Stack struct {
	// contains filtered or unexported fields
}

Stack represents a Stack backed by a double linked list.

func NewStack 

func NewStack(n string) *Stack

NewStack returns a new stack name by the given name.

func (*Stack) Back 

func (s *Stack) Back() *Element

Back returns the element at the end of the stack. Nil if the stack is empty.

func (*Stack) Clear 

func (s *Stack) Clear()

Clear clears all elements on the stack and set its length to 0.

func (*Stack) Dup 

func (s *Stack) Dup(n int) *Element

Dup duplicates and returns the element at position n. Dup is used for copying elements on to the top of its own stack. 

s.Push(s.Peek(0)) // will result in unexpected behaviour.
s.Push(s.Dup(0)) // is the correct approach.

func (*Stack) InsertAt 

func (s *Stack) InsertAt(e *Element, n int) *Element

InsertAt inserts the given item (n) deep on the stack. Be very careful using it and _always_ check both e and n before invocation as it will silently do wrong things otherwise.

func (*Stack) Iter 

func (s *Stack) Iter(f func(*Element))

Iter iterates over all the elements int the stack, starting from the top of the stack. 

s.Iter(func(elem *Element) {
	// do something with the element.
})

func (*Stack) IterBack added in v0.70.0 

func (s *Stack) IterBack(f func(*Element))

IterBack iterates over all the elements of the stack, starting from the bottom of the stack. 

s.IterBack(func(elem *Element) {
	// do something with the element.
})

func (*Stack) Len 

func (s *Stack) Len() int

Len returns the number of elements that are on the stack.

func (*Stack) MarshalJSON added in v0.61.0 

func (s *Stack) MarshalJSON() ([]byte, error)

MarshalJSON implements JSON marshalling interface.

func (*Stack) Peek 

func (s *Stack) Peek(n int) *Element

Peek returns the element (n) far in the stack beginning from the top of the stack. 

n = 0 => will return the element on top of the stack.

func (*Stack) Pop 

func (s *Stack) Pop() *Element

Pop removes and returns the element on top of the stack.

func (*Stack) Push 

func (s *Stack) Push(e *Element)

Push pushes the given element on the stack.

func (*Stack) PushVal 

func (s *Stack) PushVal(v interface{})

PushVal pushes the given value on the stack. It will infer the underlying StackItem to its corresponding type.

func (*Stack) Remove 

func (s *Stack) Remove(e *Element) *Element

Remove removes and returns the given element from the stack.

func (*Stack) RemoveAt 

func (s *Stack) RemoveAt(n int) *Element

RemoveAt removes the element (n) deep on the stack beginning from the top of the stack.

func (*Stack) Roll added in v0.71.0 

func (s *Stack) Roll(n int) error

Roll brings an item with the given index to the top of the stack, moving all the other elements down accordingly. It does all of that without popping and pushing elements.

func (*Stack) Swap added in v0.71.0 

func (s *Stack) Swap(n1, n2 int) error

Swap swaps two elements on the stack without popping and pushing them.

func (*Stack) Top 

func (s *Stack) Top() *Element

Top returns the element on top of the stack. Nil if the stack is empty.

type StackItem 

type StackItem interface {
	fmt.Stringer
	Value() interface{}
	// Dup duplicates current StackItem.
	Dup() StackItem
}

A StackItem represents the "real" value that is pushed on the stack.

func DecodeBinaryStackItem added in v0.70.0 

func DecodeBinaryStackItem(r *io.BinReader) StackItem

DecodeBinaryStackItem decodes previously serialized StackItem from the given reader. It's similar to the io.Serializable's DecodeBinary(), but implemented as a function because StackItem itself is an interface. Caveat: always check reader's error value before using the returned StackItem.

func DeserializeItem added in v0.72.1 

func DeserializeItem(data []byte) (StackItem, error)

DeserializeItem decodes StackItem from the given byte slice.

type State 

type State uint8

State of the VM.

func StateFromString 

func StateFromString(s string) (st State, err error)

StateFromString converts string into the VM State.

func (State) HasFlag 

func (s State) HasFlag(f State) bool

HasFlag checks for State flag presence.

func (State) MarshalJSON 

func (s State) MarshalJSON() (data []byte, err error)

MarshalJSON implements the json.Marshaler interface.

func (State) String 

func (s State) String() string

String implements the stringer interface.

func (*State) UnmarshalJSON 

func (s *State) UnmarshalJSON(data []byte) (err error)

UnmarshalJSON implements the json.Marshaler interface.

type StateMessage added in v0.60.0 

type StateMessage string

StateMessage is a vm state message which could be used as additional info for example by cli.

type StructItem 

type StructItem struct {
	// contains filtered or unexported fields
}

StructItem represents a struct on the stack.

func NewStructItem 

func NewStructItem(items []StackItem) *StructItem

NewStructItem returns an new StructItem object.

func (*StructItem) Clone added in v0.51.0 

func (i *StructItem) Clone() *StructItem

Clone returns a Struct with all Struct fields copied by value. Array fields are still copied by reference.

func (*StructItem) Dup added in v0.71.0 

func (i *StructItem) Dup() StackItem

Dup implements StackItem interface.

func (*StructItem) String 

func (i *StructItem) String() string

func (*StructItem) Value 

func (i *StructItem) Value() interface{}

Value implements StackItem interface.

type VM 

type VM struct {
	// contains filtered or unexported fields
}

VM represents the virtual machine.

func New 

func New() *VM

New returns a new VM object ready to load .avm bytecode scripts.

func (*VM) AddBreakPoint 

func (v *VM) AddBreakPoint(n int)

AddBreakPoint adds a breakpoint to the current context.

func (*VM) AddBreakPointRel 

func (v *VM) AddBreakPointRel(n int)

AddBreakPointRel adds a breakpoint relative to the current instruction pointer.

func (*VM) Astack 

func (v *VM) Astack() *Stack

Astack returns the alt stack so interop hooks can utilize this.

func (*VM) AtBreakpoint added in v0.60.0 

func (v *VM) AtBreakpoint() bool

AtBreakpoint returns whether VM is at breakpoint.

func (*VM) Context 

func (v *VM) Context() *Context

Context returns the current executed context. Nil if there is no context, which implies no program is loaded.

func (*VM) Estack 

func (v *VM) Estack() *Stack

Estack returns the evaluation stack so interop hooks can utilize this.

func (*VM) GasConsumed added in v0.72.0 

func (v *VM) GasConsumed() util.Fixed8

GasConsumed returns the amount of GAS consumed during execution.

func (*VM) GetInteropByID added in v0.72.0 

func (v *VM) GetInteropByID(id uint32) *InteropFuncPrice

GetInteropByID returns interop function together with price. Registered callbacks are checked in LIFO order.

func (*VM) GetPublicKeys added in v0.70.1 

func (v *VM) GetPublicKeys() map[string]*keys.PublicKey

GetPublicKeys returns internal key cache (note that it doesn't copy it).

func (*VM) HasFailed added in v0.51.0 

func (v *VM) HasFailed() bool

HasFailed returns whether VM is in the failed state now. Usually used to check status after Run.

func (*VM) HasHalted added in v0.60.0 

func (v *VM) HasHalted() bool

HasHalted returns whether VM is in Halt state.

func (*VM) HasStopped added in v0.51.0 

func (v *VM) HasStopped() bool

HasStopped returns whether VM is in Halt or Failed state.

func (*VM) Istack 

func (v *VM) Istack() *Stack

Istack returns the invocation stack so interop hooks can utilize this.

func (*VM) Load 

func (v *VM) Load(prog []byte)

Load initializes the VM with the program given.

func (*VM) LoadArgs 

func (v *VM) LoadArgs(method []byte, args []StackItem)

LoadArgs loads in the arguments used in the Mian entry point.

func (*VM) LoadFile 

func (v *VM) LoadFile(path string) error

LoadFile loads a program from the given path, ready to execute it.

func (*VM) LoadScript 

func (v *VM) LoadScript(b []byte)

LoadScript loads a script from the internal script table. It will immediately push a new context created from this script to the invocation stack and starts executing it.

func (*VM) PopResult 

func (v *VM) PopResult() interface{}

PopResult is used to pop the first item of the evaluation stack. This allows us to test compiler and vm in a bi-directional way.

func (*VM) PrintOps 

func (v *VM) PrintOps()

PrintOps prints the opcodes of the current loaded program to stdout.

func (*VM) Ready 

func (v *VM) Ready() bool

Ready returns true if the VM ready to execute the loaded program. Will return false if no program is loaded.

func (*VM) RegisterInteropGetter added in v0.71.0 

func (v *VM) RegisterInteropGetter(f InteropGetterFunc)

RegisterInteropGetter registers the given InteropGetterFunc into VM. There can be many interop getters and they're probed in LIFO order wrt their registration time.

func (*VM) Run 

func (v *VM) Run() error

Run starts the execution of the loaded program.

func (*VM) SetCheckedHash added in v0.51.0 

func (v *VM) SetCheckedHash(h []byte)

SetCheckedHash sets checked hash for CHECKSIG and CHECKMULTISIG instructions.

func (*VM) SetGasLimit added in v0.72.0 

func (v *VM) SetGasLimit(max util.Fixed8)

SetGasLimit sets maximum amount of gas which v can spent. If max <= 0, no limit is imposed.

func (*VM) SetPriceGetter added in v0.72.0 

func (v *VM) SetPriceGetter(f func(*VM, opcode.Opcode, []byte) util.Fixed8)

SetPriceGetter registers the given PriceGetterFunc in v. f accepts vm's Context, current instruction and instruction parameter.

func (*VM) SetPublicKeys added in v0.70.1 

func (v *VM) SetPublicKeys(keys map[string]*keys.PublicKey)

SetPublicKeys sets internal key cache to the specified value (note that it doesn't copy them).

func (*VM) SetScriptGetter added in v0.51.0 

func (v *VM) SetScriptGetter(gs func(util.Uint160) []byte)

SetScriptGetter sets the script getter for CALL instructions.

func (*VM) Stack 

func (v *VM) Stack(n string) string

Stack returns json formatted representation of the given stack.

func (*VM) State added in v0.61.0 

func (v *VM) State() string

State returns string representation of the state for the VM.

func (*VM) Step 

func (v *VM) Step() error

Step 1 instruction in the program.

func (*VM) StepInto added in v0.51.0 

func (v *VM) StepInto() error

StepInto behaves the same as “step over” in case if the line does not contain a function. Otherwise the debugger will enter the called function and continue line-by-line debugging there.

func (*VM) StepOut added in v0.51.0 

func (v *VM) StepOut() error

StepOut takes the debugger to the line where the current function was called.

func (*VM) StepOver added in v0.51.0 

func (v *VM) StepOver() error

StepOver takes the debugger to the line that will step over a given line. If the line contains a function the function will be executed and the result returned without debugging each line.

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