mirror of
https://github.com/nspcc-dev/neo-go.git
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398 lines
9.9 KiB
Go
398 lines
9.9 KiB
Go
package vm
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import (
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"math/big"
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"github.com/CityOfZion/neo-go/pkg/vm/stack"
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)
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// Add adds two stack Items together.
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// Returns an error if either items cannot be casted to an integer
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// or if integers cannot be added together
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func Add(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := operandA.Add(operandB)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Sub subtracts two stack Items.
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// Returns an error if either items cannot be casted to an integer
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// or if integers cannot be subtracted together
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func Sub(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := operandB.Sub(operandA)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Inc increments the stack Item's value by 1.
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// Returns an error if the item cannot be casted to an integer
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// or if 1 cannot be added to the item.
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func Inc(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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i, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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one, err := stack.NewInt(big.NewInt(1))
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if err != nil {
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return FAULT, err
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}
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res, err := i.Add(one)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Dec decrements the stack Item's value by 1.
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// Returns an error if the item cannot be casted to an integer
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// or if 1 cannot be subtracted to the item.
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func Dec(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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i, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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one, err := stack.NewInt(big.NewInt(1))
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if err != nil {
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return FAULT, err
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}
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res, err := i.Sub(one)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Div divides one stack Item by an other.
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// Returns an error if either items cannot be casted to an integer
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// or if the division of the integers cannot be performed.
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func Div(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := operandB.Div(operandA)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Mod returns the mod of two stack Items.
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// Returns an error if either items cannot be casted to an integer
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// or if the mode of the integers cannot be performed.
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func Mod(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := operandB.Mod(operandA)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Nz pops an integer from the stack.
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// Then pushes a boolean to the stack which evaluates to true
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// iff the integer was not zero.
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// Returns an error if the popped item cannot be casted to an integer
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// or if we cannot create a boolean.
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func Nz(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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i, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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b, err := i.Boolean()
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(b)
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return NONE, nil
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}
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// Mul multiplies two stack Items together.
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// Returns an error if either items cannot be casted to an integer
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// or if integers cannot be multiplied together.
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func Mul(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := operandA.Mul(operandB)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Abs pops an integer off of the stack and pushes its absolute value onto the stack.
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// Returns an error if the popped value is not an integer or if the absolute value cannot be taken
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func Abs(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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i, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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a, err := i.Abs()
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(a)
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return NONE, nil
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}
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// Not flips the stack Item's value.
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// If the value is True, it is flipped to False and viceversa.
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func Not(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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b, err := ctx.Estack.PopBoolean()
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(b.Not())
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return NONE, nil
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}
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// BoolAnd pops two booleans off of the stack and pushes a boolean to the stack
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// whose value is true iff both booleans' values are true.
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// Returns an error if either items cannot be casted to an boolean
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func BoolAnd(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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bool1, bool2, err := popTwoBooleans(ctx)
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if err != nil {
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return FAULT, err
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}
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res := bool1.And(bool2)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// BoolOr pops two booleans off of the stack and pushes a boolean to the stack
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// whose value is true iff at least one of the two booleans' value is true.
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// Returns an error if either items cannot be casted to an boolean
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func BoolOr(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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bool1, bool2, err := popTwoBooleans(ctx)
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if err != nil {
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return FAULT, err
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}
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res := bool1.Or(bool2)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Sign puts the sign of the top stack Item on top of the stack.
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// If value is negative, put -1;
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// If positive, put 1;
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// If value is zero, put 0.
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func Sign(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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i, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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s := int64(i.Value().Sign())
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sign, err := stack.NewInt(big.NewInt(s))
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(sign)
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return NONE, nil
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}
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// Negate flips the sign of the stack Item.
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func Negate(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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i, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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a := big.NewInt(0).Neg(i.Value())
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b, err := stack.NewInt(a)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(b)
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return NONE, nil
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}
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func popTwoIntegers(ctx *stack.Context) (*stack.Int, *stack.Int, error) {
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operandA, err := ctx.Estack.PopInt()
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if err != nil {
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return nil, nil, err
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}
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operandB, err := ctx.Estack.PopInt()
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if err != nil {
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return nil, nil, err
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}
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return operandA, operandB, nil
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}
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// Shl pops two integers, a and b, off of the stack and pushes an integer to the stack
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// whose value is the b's value shift to the left by a's value bits.
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// Returns an error if either items cannot be casted to an integer
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// or if the left shift operation cannot per performed with the two integer's value.
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func Shl(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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a, b, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := b.Lsh(a)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Shr pops two integers, a and b, off of the stack and pushes an integer to the stack
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// whose value is the b's value shift to the right by a's value bits.
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// Returns an error if either items cannot be casted to an integer
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// or if the right shift operation cannot per performed with the two integer's value.
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func Shr(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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a, b, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res, err := b.Rsh(a)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(res)
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return NONE, nil
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}
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// Lt pops two integers, a and b, off of the stack and pushes a boolean the stack
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// whose value is true if a's value is less than b's value.
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// Returns an error if either items cannot be casted to an integer
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func Lt(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res := operandB.Lt(operandA)
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ctx.Estack.Push(stack.NewBoolean(res))
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return NONE, nil
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}
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// Gt pops two integers, a and b, off of the stack and pushes a boolean the stack
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// whose value is true if a's value is greated than b's value.
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// Returns an error if either items cannot be casted to an integer
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func Gt(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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operandA, operandB, err := popTwoIntegers(ctx)
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if err != nil {
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return FAULT, err
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}
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res := operandB.Gt(operandA)
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ctx.Estack.Push(stack.NewBoolean(res))
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return NONE, nil
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}
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func popTwoByteArrays(ctx *stack.Context) (*stack.ByteArray, *stack.ByteArray, error) {
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// Pop first stack item and cast as byte array
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ba1, err := ctx.Estack.PopByteArray()
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if err != nil {
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return nil, nil, err
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}
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// Pop second stack item and cast as byte array
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ba2, err := ctx.Estack.PopByteArray()
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if err != nil {
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return nil, nil, err
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}
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return ba1, ba2, nil
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}
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func popTwoBooleans(ctx *stack.Context) (*stack.Boolean, *stack.Boolean, error) {
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bool1, err := ctx.Estack.PopBoolean()
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if err != nil {
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return nil, nil, err
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}
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bool2, err := ctx.Estack.PopBoolean()
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if err != nil {
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return nil, nil, err
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}
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return bool1, bool2, nil
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}
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