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use crate::execute::Execute; use crate::resolver::RuntimeModuleImportResolver; use wasmi::{ImportsBuilder, MemoryRef, Module, ModuleInstance}; pub struct Runtime<'a> { code: &'a [u8], pub(crate) data: &'a [u8], pub(crate) pre_root: [u8; 32], pub(crate) post_root: [u8; 32], pub(crate) ticks_left: u32, pub(crate) memory: Option<MemoryRef>, } impl<'a> Runtime<'a> { pub fn new(code: &'a [u8], data: &'a [u8], pre_root: [u8; 32]) -> Runtime<'a> { Runtime { code, data, pre_root, post_root: [0u8; 32], ticks_left: 999, memory: None, } } } impl<'a> Execute<'a> for Runtime<'a> { fn execute(&'a mut self) -> [u8; 32] { let module = Module::from_buffer(self.code).expect("Module loading to succeed"); let mut imports = ImportsBuilder::new(); imports.push_resolver("env", &RuntimeModuleImportResolver); let instance = ModuleInstance::new(&module, &imports) .expect("Module instantation expected to succeed") .assert_no_start(); self.memory = Some( instance .export_by_name("memory") .expect("Module expected to have 'memory' export") .as_memory() .cloned() .expect("'memory' export should be a memory"), ); instance .invoke_export("main", &[], self) .expect("Executed 'main'"); self.post_root } }