rust-bitcoin-script-stack/src/stack.rs at main · BitVM/rust-bitcoin-script-stack · GitHub

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use std::collections::HashMap;

use bitcoin::{opcodes::OP_TRUE, Opcode, hex::FromHex};

use bitcoin::opcodes::all::*;

pub use bitcoin_script::script;

pub use bitcoin_script::builder::StructuredScript as Script;

use crate::debugger::{execute_step, print_execute_step, show_altstack, show_stack, StepResult};

use super::script_util::*;

#[derive(Clone, Debug, Copy)]

pub struct StackVariable {

id: u32,

size: u32,

}

impl StackVariable {

pub fn new(id: u32, size: u32) -> Self {

StackVariable { id, size }

}

pub fn null() -> Self {

StackVariable { id: 0, size: 0 }

}

pub fn is_null(&self) -> bool {

self.id == 0

}

pub fn id(&self) -> u32 {

self.id

}

pub fn size(&self) -> u32 {

self.size

}

#[derive(Clone, Debug)]

enum RedoOps {

PushStack(StackVariable),

PushAltstack(StackVariable),

PopStack,

PopAltstack,

SetName(StackVariable, String),

RemoveName(StackVariable),

RemoveVar(StackVariable),

DecreaseSize(StackVariable),

IncreaseSize(usize, u32),

}

#[derive(Clone, Debug)]

pub struct StackData {

pub(crate) stack: Vec<StackVariable>,

pub(crate) altstack: Vec<StackVariable>,

pub(crate) names: HashMap<u32, String>,

redo_log: Vec<RedoOps>,

with_redo_log: bool,

}

impl StackData {

pub fn new(with_redo_log: bool) -> Self {

StackData {

stack: Vec::new(),

altstack: Vec::new(),

names: HashMap::new(),

redo_log: Vec::new(),

with_redo_log

}

pub fn push_stack(&mut self, var: StackVariable) {

self.stack.push(var);

if self.with_redo_log {

self.redo_log.push(RedoOps::PushStack(var));

}

pub fn push_altstack(&mut self, var: StackVariable) {

self.altstack.push(var);

if self.with_redo_log {

self.redo_log.push(RedoOps::PushAltstack(var));

}

pub fn pop_stack(&mut self) -> StackVariable {

if self.with_redo_log {

self.redo_log.push(RedoOps::PopStack);

}

self.stack.pop().unwrap()

}

pub fn pop_altstack(&mut self) -> StackVariable {

if self.with_redo_log {

self.redo_log.push(RedoOps::PopAltstack);

}

self.altstack.pop().unwrap()

}

pub fn set_name(&mut self, var: StackVariable, name: &str) {

self.names.insert(var.id, name.to_string());

if self.with_redo_log {

self.redo_log.push(RedoOps::SetName(var, name.to_string()));

}

pub fn remove_name(&mut self, var: StackVariable) {

self.names.remove(&var.id);

if self.with_redo_log {

self.redo_log.push(RedoOps::RemoveName(var));

}

pub fn remove_var(&mut self, var: StackVariable) {

self.stack.retain(|x| x.id != var.id);

if self.with_redo_log {

self.redo_log.push(RedoOps::RemoveVar(var));

}

pub fn increase_size(&mut self, idx: usize, next_size: u32) {

self.stack[idx].size += next_size;

if self.with_redo_log {

self.redo_log.push(RedoOps::IncreaseSize(idx, next_size));

}

pub fn decrease_size(&mut self, var: StackVariable) {

for v in self.stack.iter_mut() {

if v.id == var.id {

v.size -= 1;

}

if self.with_redo_log {

self.redo_log.push(RedoOps::DecreaseSize(var));

}

pub fn new_from_redo_height(&self, height: usize) -> Self {

let mut new_stack = StackData::new(false);

for i in 0..height {

match &self.redo_log[i] {

RedoOps::PushStack(var) => new_stack.push_stack(*var),

RedoOps::PushAltstack(var) => new_stack.push_altstack(*var),

RedoOps::PopStack => { let _ = new_stack.pop_stack(); },

RedoOps::PopAltstack => { let _ = new_stack.pop_altstack(); },

RedoOps::SetName(var, name) => new_stack.set_name(*var, name),

RedoOps::RemoveName(var) => new_stack.remove_name(*var),

RedoOps::RemoveVar(var) => new_stack.remove_var(*var),

RedoOps::DecreaseSize(var) => new_stack.decrease_size(*var),

RedoOps::IncreaseSize(idx, next_size) => new_stack.increase_size(*idx, *next_size),

}

new_stack

}

#[derive(Clone, Debug)]

pub struct StackTracker {

pub(crate) data: StackData,

pub(crate) script: Vec<Script>,

pub(crate) history: Vec<u32>,

counter: u32,

max_stack_size: u32,

with_history: bool,

pub(crate) breakpoint: Vec<(u32, String)>,

}

impl Default for StackTracker {

fn default() -> Self {

Self::new()

}

impl StackTracker {

pub fn new() -> Self {

StackTracker {

data: StackData::new(true),

script: Vec::new(),

history: Vec::new(),

counter: 0,

max_stack_size: 0,

with_history: true,

breakpoint: Vec::new(),

}

fn push(&mut self, var: StackVariable) {

self.data.push_stack(var);

let totalsize = self.data.stack.iter().fold(0, |acc, f| acc + f.size);

self.max_stack_size = self.max_stack_size.max(totalsize);

}

fn push_script(&mut self, script: Script) {

self.script.push(script);

if self.with_history {

self.history.push(self.data.redo_log.len() as u32);

}

pub fn set_breakpoint(&mut self, name: &str) {

self.push_script(script!{});

self.breakpoint.push((self.script.len()as u32 - 1, name.to_string()));

}

pub fn get_next_breakpoint(&self, from:u32) -> Option<(u32, String)> {

for (pos, name) in self.breakpoint.iter() {

if *pos > from {

let pos = *pos;

let pos = pos.min(self.script.len() as u32 - 1);

return Some((pos, name.clone()));

}

None

}

pub fn get_prev_breakpoint(&self, from:u32) -> Option<(u32, String)> {

let mut ret = None;

for (pos, name) in self.breakpoint.iter() {

if *pos < from {

ret = Some((*pos, name.clone()));

}

if *pos > from {

break;

}

ret

}

pub fn get_max_stack_size(&self) -> u32 {

self.max_stack_size

}

pub fn next_counter(&mut self) -> u32 {

self.counter += 1;

self.counter

}

//limited branch if:

// it's only possible for now to create two branches that consumes the same amount of variables from the stack

// and produce the same amount of variables of the same size

pub fn open_if(&mut self) -> (StackTracker, StackTracker) {

let (mut if_true, mut if_false) = (self.clone(), self.clone());

if_true.op_drop();

if_false.op_drop();

self.custom(script!{ OP_IF }, 1, false, 0, "open_if");

(if_true, if_false)

}

pub fn end_if(&mut self, if_true: StackTracker, if_false: StackTracker, consumes:u32, output_vars: Vec<(u32, String)>, to_altstack: u32) -> Vec<StackVariable> {

self.custom_ex(

script! {

for s in if_true.script.iter().skip(self.script.len()) {

{ s.clone() }

}

OP_ELSE

for s in if_false.script.iter().skip(self.script.len()) {

{ s.clone() }

}

OP_ENDIF

}, consumes, output_vars, to_altstack)

}

pub fn define(&mut self, size: u32, name: &str) -> StackVariable {

let var = StackVariable::new(self.next_counter(), size);

self.push(var);

self.data.set_name(var, name);

var

}

pub fn var(&mut self, size: u32, script: Script, name: &str) -> StackVariable {

let var = StackVariable::new( self.next_counter(), size );

self.push(var);

self.data.set_name(var, name);

self.push_script(script);

var

}

pub fn rename(&mut self, var: StackVariable, name: &str) {

self.data.set_name(var, name);

}

pub fn drop(&mut self, var: StackVariable) {

assert!(self.data.stack.last().unwrap().id == var.id);

self.data.pop_stack();

self.data.remove_name(var);

self.push_script(drop_count(var.size));

}

pub fn to_altstack(&mut self) -> StackVariable {

let var = self.data.pop_stack();

self.data.push_altstack(var);

self.push_script( toaltstack(var.size) );

var

}

pub fn to_altstack_count(&mut self, count: u32) -> Vec<StackVariable> {

let mut ret = Vec::new();

for _ in 0..count {

let var = self.to_altstack();

ret.push(var);

}

ret

}

pub fn from_altstack(&mut self) -> StackVariable {

let var = self.data.pop_altstack();

self.push(var);

self.push_script( fromaltstack(var.size) );

var

}

pub fn from_altstack_count(&mut self, count: u32) -> Vec<StackVariable> {

let mut ret = Vec::new();

for _ in 0..count {

let var = self.from_altstack();

ret.push(var);

}

ret

}

pub fn from_altstack_joined(&mut self, count: u32, name: &str) -> StackVariable {

assert!(count > 1, "from_altstack_joined requires count > 1");

let mut tmp = self.from_altstack_count(count);

self.join_count(&mut tmp[0], count - 1);

self.rename(tmp[0], name);

tmp[0]

}

pub fn get_script(&self) -> Script {

script! {

for s in self.script.iter() {

{ s.clone() }

}

pub fn move_var(&mut self, var: StackVariable) -> StackVariable {

let offset = self.get_offset(var);

if offset == 0 {

return var;

}

self.data.remove_var(var);

self.push(var);

self.push_script( move_from(offset, var.size));

var

}

pub fn copy_var(&mut self, var: StackVariable) -> StackVariable {

let offset = self.get_offset(var);

let new_var = StackVariable::new(self.next_counter(), var.size);

self.push(new_var);

self.rename(new_var, &format!("copy({})", self.data.names[&var.id]));

self.push_script( copy_from(offset, var.size));

new_var

}

// if var2 is going to be consumed and it is at the top of the stack it avoid moving it

pub fn equals(&mut self, var1: &mut StackVariable, consume_1: bool, var2: &mut StackVariable, consume_2: bool) {

assert_eq!(var1.size, var2.size, "The variables {:?} and {:?} are not the same size", var1, var2);

assert_ne!(var1.id, var2.id, "The variables {:?} and {:?} are the same", var1, var2);

let dont_move = consume_2 && self.data.stack.last().unwrap().id == var2.id;

for i in 0..var1.size {

if dont_move {

self.data.decrease_size(*var2);

var2.size -= 1;

if var2.size == 0 {

self.data.remove_var(*var2);

}

self.define(1, "extracted");

}

if consume_1 {

self.move_var_sub_n(var1, var1.size - 1);

} else {

self.copy_var_sub_n(*var1, var1.size - i - 1);

}

if consume_2 {

if !dont_move {

self.move_var_sub_n(var2, var2.size - 1);

}

} else {

self.copy_var_sub_n(*var2, var2.size - i - 1);

}

self.op_equalverify();

}

pub fn get_offset(&self, var: StackVariable) -> u32 {

let mut count = 0;

for v in self.data.stack.iter().rev() {

if var.id == v.id {

return count;

}

count += v.size;

}

panic!("The var {:?} is not part of the stack", var);

}

pub fn get_var_from_stack(&self, depth: u32) -> StackVariable {

self.data.stack[self.data.stack.len() - 1 - depth as usize]

}

pub fn get_var_name(&self, var: StackVariable) -> String {

self.data.names[&var.id].clone()

}

pub fn get_script_len(&self) -> usize {

self.script.len()

}

pub fn run(&self) -> StepResult {

execute_step(self, self.script.len()-1)

}

pub fn show_stack(&self) {

show_stack(&self.data, vec![]);

}

pub fn show_altstack(&self) {

show_altstack(&self.data, vec![]);

}

pub fn copy_var_sub_n(&mut self, var: StackVariable, n: u32) -> StackVariable {

let offset = self.get_offset(var);

let offset_n = offset + var.size - 1 - n;

let new_var = StackVariable::new(self.next_counter(), 1);

self.push(new_var);

self.push_script( copy_from(offset_n, 1));

new_var

}

pub fn move_var_sub_n(&mut self, var: &mut StackVariable, n: u32) -> StackVariable {

assert!(var.size > n, "The variable {:?} is not big enough to move n={}", var, n);

let offset = self.get_offset(*var);

let offset_n = offset + var.size - 1 - n;

var.size -= 1;

self.data.decrease_size(*var);

if var.size == 0 {

self.data.remove_var(*var);

}

let new_var = StackVariable::new(self.next_counter(), 1);

self.push(new_var);

self.push_script( move_from(offset_n, 1));

new_var

}

pub fn join(&mut self, var1: &mut StackVariable) {

let len = self.data.stack.len();

for i in 0..len {

if self.data.stack[i].id == var1.id {

assert!(i + 1 < len, "The variable {:?} is the last one on the stack", var1);

let next_size = self.data.stack[i+1].size;

var1.size += next_size;

self.data.increase_size(i, next_size);

self.data.remove_var(self.data.stack[i+1]);

break;

}

pub fn get_var(&self, depth: u32) -> StackVariable {

let mut count = 0;

for v in self.data.stack.iter().rev() {

if count == depth {

return *v;

}

count += v.size;

}

panic!("The depth {} is not valid", depth);

}

pub fn join_count(&mut self, var: &mut StackVariable, count: u32) -> StackVariable {

for _ in 0..count {

self.join(var)

}

*var

}

pub fn explode(&mut self, var: StackVariable) -> Vec<StackVariable> {

let mut ret = Vec::new();

assert!(self.data.stack.last().unwrap().id == var.id, "Explode is only supported with the last variable on stack" );

self.data.remove_var(var);

for i in 0..var.size {

let new_var = StackVariable::new(self.next_counter(), 1);

self.rename(new_var, &format!("{}[{}]", self.get_var_name(var), i));

ret.push(new_var);

self.push(new_var);

}

ret

}

pub fn custom_ex(&mut self, script: Script, consumes: u32, output_vars: Vec<(u32, String )> , to_altstack: u32) -> Vec<StackVariable> {

for _ in 0..consumes {

self.data.pop_stack();

}

if !output_vars.is_empty() {

let mut ret = Vec::new();

for (size, name) in output_vars {

ret.push(self.define(size, &name));

}

self.push_script(script);

return ret;

}

for _ in 0..to_altstack {

let c = self.next_counter();

self.data.push_altstack(StackVariable::new(c, 1));

}

self.push_script(script);

vec![]

}

pub fn custom(&mut self, script: Script, consumes: u32, output: bool, to_altstack: u32, name: &str ) -> Option<StackVariable> {

let mut output_vec = vec![];

if output {

output_vec.push((1u32, name.to_string()));

}

let ret = self.custom_ex(script, consumes, output_vec, to_altstack);

if ret.is_empty() {

None

} else {

Some(ret[0])

}

fn op(&mut self, op: Opcode, consumes: u32, output: bool, name: &str ) -> Option<StackVariable> {

self.custom(Script::new("").push_opcode(op), consumes, output, 0, name)

}

pub fn op_negate(&mut self) -> StackVariable {

self.op(OP_NEGATE, 1, true, "OP_NEGATE()").unwrap()

}

pub fn op_abs(&mut self) -> StackVariable {

self.op(OP_ABS, 1, true, "OP_ABS()").unwrap()

}

pub fn op_add(&mut self) -> StackVariable {

self.op(OP_ADD, 2, true, "OP_ADD()").unwrap()

}

pub fn op_sub(&mut self) -> StackVariable {

self.op(OP_SUB, 2, true, "OP_SUB()").unwrap()

}

pub fn op_min(&mut self) -> StackVariable {

self.op(OP_MIN, 2, true, "OP_MIN()").unwrap()

}

pub fn op_max(&mut self) -> StackVariable {

self.op(OP_MAX, 2, true, "OP_MAX()").unwrap()

}

pub fn op_within(&mut self) -> StackVariable {

self.op(OP_WITHIN, 3, true, "OP_WITHIN()").unwrap()

}

pub fn op_1add(&mut self) -> StackVariable {

self.op(OP_1ADD, 1, true, "OP_1ADD()").unwrap()

}

pub fn op_1sub(&mut self) -> StackVariable {

self.op(OP_1SUB, 1, true, "OP_1SUB()").unwrap()

}

pub fn op_not(&mut self) -> StackVariable {

self.op(OP_NOT, 1, true, "OP_NOT()").unwrap()

}

pub fn op_booland(&mut self) -> StackVariable {

self.op(OP_BOOLAND, 2, true, "OP_BOOLAND()").unwrap()

}

pub fn op_boolor(&mut self) -> StackVariable {

self.op(OP_BOOLOR, 2, true, "OP_BOOLOR()").unwrap()

}

pub fn op_equal(&mut self) -> StackVariable {

self.op(OP_EQUAL, 2, true, "OP_EQUAL()").unwrap()

}

pub fn op_numequal(&mut self) -> StackVariable {

self.op(OP_NUMEQUAL, 2, true, "OP_NUMEQUAL()").unwrap()

}

pub fn op_numnotequal(&mut self) -> StackVariable {

self.op(OP_NUMNOTEQUAL, 2, true, "OP_NUMNOTEQUAL()").unwrap()

}

pub fn op_lessthan(&mut self) -> StackVariable {

self.op(OP_LESSTHAN, 2, true, "OP_LESSTHAN()").unwrap()

}

pub fn op_lessthanorequal(&mut self) -> StackVariable {

self.op(OP_LESSTHANOREQUAL, 2, true, "OP_LESSTHANOREQUAL()").unwrap()

}

pub fn op_greaterthan(&mut self) -> StackVariable {

self.op(OP_GREATERTHAN, 2, true, "OP_GREATERTHAN()").unwrap()

}

pub fn op_greaterthanorequal(&mut self) -> StackVariable {

self.op(OP_GREATERTHANOREQUAL, 2, true, "OP_GREATERTHANOREQUAL()").unwrap()

}

pub fn op_numequalverify(&mut self) {

self.op(OP_NUMEQUALVERIFY, 2, false, "OP_NUMEQUALVERIFY()");

}

pub fn op_0notequal(&mut self) -> StackVariable {

self.op(OP_0NOTEQUAL, 1, true, "OP_0NOTEQUAL()").unwrap()

}

pub fn op_pick(&mut self) -> StackVariable {

self.op(OP_PICK, 1, true, "OP_PICK()").unwrap()

}

pub fn op_ifdup(&mut self) -> StackVariable {

panic!("OP_IFDUP not implemented as it's not possible to know if it would output a value");

}

pub fn op_roll(&mut self) -> StackVariable {

panic!("OP_ROLL not implemented as it would consume an undefined position on the stack");

}

pub fn op_swap(&mut self) {

let x = self.data.pop_stack();

let y = self.data.pop_stack();

self.data.push_stack(x);

self.data.push_stack(y);

self.op(OP_SWAP, 0, false, "OP_SWAP()");

}

pub fn op_2swap(&mut self) {

let d = self.data.pop_stack();

let c = self.data.pop_stack();

let b = self.data.pop_stack();

let a = self.data.pop_stack();

self.data.push_stack(c);

self.data.push_stack(d);

self.data.push_stack(a);

self.data.push_stack(b);

self.op(OP_2SWAP, 0, false, "OP_2SWAP()");

}

pub fn op_tuck(&mut self) -> StackVariable {

let var = StackVariable::new( self.next_counter(), 1 );

let x = self.data.pop_stack();

let y = self.data.pop_stack();

assert!(x.size == 1 && y.size == 1, "OP_TUCK requires two elements of size 1");

self.push(var);

self.push(y);

self.push(x);

self.data.set_name(var, "OP_TuCK()");

self.push_script(script!{OP_TUCK});

var

}

pub fn op_rot(&mut self) {

let x = self.data.pop_stack();

let y = self.data.pop_stack();

let z = self.data.pop_stack();

assert!(x.size == 1 && y.size == 1 && z.size == 1, "OP_ROT requires three elements of size 1");

self.data.push_stack(y);

self.data.push_stack(x);

self.data.push_stack(z);

self.op(OP_ROT, 0, false, "OP_ROT()");

}

pub fn op_2rot(&mut self) {

let f = self.data.pop_stack();

let e = self.data.pop_stack();

let d = self.data.pop_stack();

let c = self.data.pop_stack();

let b = self.data.pop_stack();

let a = self.data.pop_stack();

self.data.push_stack(c);

self.data.push_stack(d);

self.data.push_stack(e);

self.data.push_stack(f);

self.data.push_stack(a);

self.data.push_stack(b);

self.op(OP_2ROT, 0, false, "OP_2ROT()");

}

pub fn op_over(&mut self) -> StackVariable {

let x = self.get_var_from_stack(1);

let name = self.get_var_name(x);

self.op(OP_OVER, 0, true, &name).unwrap()

}

pub fn op_2over(&mut self) -> (StackVariable, StackVariable) {

let x = self.get_var_from_stack(3);

let name = self.get_var_name(x);

let y = self.get_var_from_stack(2);

let namey = self.get_var_name(y);

self.define(1, &name);

(x, self.op(OP_2OVER, 0, true, &namey).unwrap())

}

pub fn op_verify(&mut self) {

let _ = self.op(OP_VERIFY, 1, false, "OP_VERIFY()");

}

pub fn op_equalverify(&mut self) {

let _ = self.op(OP_EQUALVERIFY, 2, false, "OP_EQUALVERIFY()");

}

pub fn op_sha256(&mut self) -> StackVariable {

let x = self.get_var_from_stack(0);

let name = self.get_var_name(x);

self.op(OP_SHA256, 1, true, &format!("sha256({})",name)).unwrap()

}

pub fn op_hash160(&mut self) -> StackVariable {

let x = self.get_var_from_stack(0);

let name = self.get_var_name(x);

self.op(OP_HASH160, 1, true, &format!("hash160({})",name)).unwrap()

}

pub fn op_hash256(&mut self) -> StackVariable {

let x = self.get_var_from_stack(0);

let name = self.get_var_name(x);

self.op(OP_HASH256, 1, true, &format!("hash256({})",name)).unwrap()

}

pub fn op_ripemd160(&mut self) -> StackVariable {

let x = self.get_var_from_stack(0);

let name = self.get_var_name(x);

self.op(OP_RIPEMD160, 1, true, &format!("ripemd160({})",name)).unwrap()

}

pub fn hexstr(&mut self, value: &str) -> StackVariable {

let bytes = Vec::from_hex(value).unwrap();

self.var(1, script!{{bytes}}, "hexdata")

}

pub fn number(&mut self, value: u32) -> StackVariable {

self.var(1, script!{{value}}, &format!("number({:#x})", value))

}

pub fn numberi(&mut self, value: i32) -> StackVariable {

self.var(1, script!{{value}}, &format!("number({:#x})", value))

}

pub fn byte(&mut self, value: u8) -> StackVariable {

self.var(2, byte_to_nibble(value), &format!("byte({:#x})", value))

}

pub fn number_u32(&mut self, value: u32) -> StackVariable {

self.var(8, number_to_nibble(value), &format!("number_u32({:#x})", value))

}

pub fn number_u32_u8(&mut self, value: u32) -> StackVariable {

self.var(4, number_to_nibble_u8(value), &format!("number_u32_u8({:#x})", value))

}

pub fn op_true(&mut self) -> StackVariable {

self.op(OP_TRUE, 0, true, "OP_TRUE").unwrap()

}

pub fn op_nop(&mut self) -> StackVariable {

self.op(OP_NOP, 0, true, "OP_NOP()").unwrap()

}

pub fn op_drop(&mut self) {

self.op(OP_DROP, 1, false, "OP_DROP");

}

pub fn op_2drop(&mut self) {

self.op(OP_2DROP, 2, false, "OP_2DROP");

}

pub fn op_depth(&mut self) -> StackVariable {

self.op(OP_DEPTH, 0, true, "OP_DEPTH").unwrap()

}

pub fn op_nip(&mut self) {

let x = self.data.pop_stack();

self.data.pop_stack();

self.data.push_stack(x);

self.op(OP_NIP, 0, false, "OP_NIP");

}

pub fn op_dup(&mut self) -> StackVariable {

self.op(OP_DUP, 0, true, "OP_DUP").unwrap()

}

pub fn op_2dup(&mut self) -> (StackVariable, StackVariable) {

let x = self.define(1, "OP_DUP");

(x, self.op(OP_2DUP, 0, true, "OP_DUP").unwrap())

}

pub fn op_3dup(&mut self) -> (StackVariable, StackVariable, StackVariable) {

let x = self.define(1, "OP_DUP");

let y = self.define(1, "OP_DUP");

(x, y, self.op(OP_3DUP, 0, true, "OP_DUP").unwrap())

}

pub fn get_value_from_table(&mut self, table: StackVariable, offset: Option<u32> ) -> StackVariable {

self.number(self.get_offset(table)-1 + offset.unwrap_or(0));

self.op_add();

let v = self.op_pick();

self.rename(v, &format!("from:({})", self.data.names[&table.id]));

}

pub fn debug(&mut self) {

println!("Max stack size: {}", self.max_stack_size);

self.push_script(script!{});

print_execute_step(self, self.script.len()-1);

}

#[cfg(test)]

mod tests {

pub use bitcoin_script::script;

use super::{StackData, StackTracker, StackVariable};

use crate::debugger::{debug_script, show_altstack, show_stack};

use crate::script_util::*;

#[test]

fn test_one_var() {

let mut stack = StackTracker::new();

stack.number_u32(1234);

stack.custom(script!{ {verify_n(8)} }, 2, false, 0, "verify");

stack.op_true();

assert!(stack.run().success);

}

#[test]

fn test_byte() {

let mut stack = StackTracker::new();

let byte = stack.byte(254);

stack.explode(byte);

stack.number(0xe);

stack.op_equalverify();

stack.number(0xf);

stack.op_equalverify();

stack.op_true();

assert!(stack.run().success);

}

#[test]

fn test_move_var() {

let mut stack = StackTracker::new();

let x = stack.number_u32(1234);

let y = stack.number_u32(2345);

stack.move_var(x);

stack.number_u32(1234);

stack.custom(script!{ {verify_n(8)} }, 2, false, 0, "verify");

stack.drop(y);

stack.op_true();

assert!(stack.run().success);

}

#[test]

fn test_copy_var() {

let mut stack = StackTracker::new();

let x = stack.number_u32(1234);

let y = stack.number_u32(2345);

let _ = stack.copy_var(x);

let _ = stack.number_u32(1234);

stack.custom(script!{ {verify_n(8)} }, 2, false, 0, "verify");

stack.drop(y);

stack.drop(x);

stack.op_true();

assert!(stack.run().success);

}

#[test]

fn test_define_var() {

let mut stack = StackTracker::new();

let pre_existent = stack.define(8, "pre_existent");

let _ = stack.number_u32(4444);

let _ = stack.move_var(pre_existent);

let script = script! {

{ number_to_nibble(1234) }

{ stack.get_script()}

{ number_to_nibble(1234) }

{ verify_n(8) }

{ drop_count(8) }

OP_TRUE

};

let (ret,_) = debug_script(script.compile());

assert!(ret.result().unwrap().success);

}

#[test]

fn test_copy_var_sub_n() {

let mut stack = StackTracker::new();

let x = stack.number_u32(0xdeadbeaf);

let _ = stack.copy_var_sub_n(x, 0);

let _ = stack.copy_var_sub_n(x, 7);

let script = script! {

{ stack.get_script()}

OP_15

{ verify_n(1) }

OP_13

{ verify_n(1) }

{ drop_count(8) }

OP_TRUE

};

let (ret,_) = debug_script(script.compile());

assert!(ret.result().unwrap().success);

}

#[test]

fn test_move_sub_n() {

let mut stack = StackTracker::new();

let mut x = stack.number_u32(0xdeadbeaf);

let _ = stack.move_var_sub_n(&mut x, 1);

let script = script! {

{ stack.get_script()}

OP_10

{ verify_n(1) }

OP_14

{ verify_n(1) }

{ drop_count(6) }

OP_TRUE

};

let (ret,_) = debug_script(script.compile());

assert!(ret.result().unwrap().success);

}

#[test]

fn test_equals() {

//test without moving the last number

let mut stack = StackTracker::new();

let mut x = stack.number_u32(0x123456);

let mut y = stack.copy_var(x);

stack.equals(&mut x, true, &mut y, true);

stack.op_true();

assert!(stack.run().success);

let mut stack = StackTracker::new();

let mut x = stack.number_u32(0x123456);

let mut y = stack.copy_var(x);

stack.op_true();

stack.equals(&mut x, true, &mut y, true);

assert!(stack.run().success);

let mut stack = StackTracker::new();

let mut x = stack.number_u32(0x123456);

let mut y = stack.copy_var(x);

stack.equals(&mut x, false, &mut y, false);

stack.drop(y);

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rust-bitcoin-script-stack/src/stack.rs at main · BitVM/rust-bitcoin-script-stack · GitHub

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