use std::mem; use std::ops; use std::{u32, usize}; use std::fmt::{self, Display}; use std::iter::repeat; use std::collections::{HashMap, VecDeque}; use parity_wasm::elements::{Opcode, BlockType, Local}; use {Error, Trap, TrapKind, Signature}; use module::ModuleRef; use func::{FuncRef, FuncInstance, FuncInstanceInternal}; use value::{ RuntimeValue, TryInto, WrapInto, TryTruncateInto, ExtendInto, ArithmeticOps, Integer, Float, LittleEndianConvert, TransmuteInto, }; use host::Externals; use common::{DEFAULT_MEMORY_INDEX, DEFAULT_TABLE_INDEX, BlockFrame, BlockFrameType}; use common::stack::StackWithLimit; use memory_units::Pages; /// Maximum number of entries in value stack. pub const DEFAULT_VALUE_STACK_LIMIT: usize = 16384; /// Maximum number of entries in frame stack. pub const DEFAULT_FRAME_STACK_LIMIT: usize = 16384; /// Function interpreter. pub struct Interpreter<'a, E: Externals + 'a> { externals: &'a mut E, } /// Interpreter action to execute after executing instruction. pub enum InstructionOutcome { /// Continue with next instruction. RunNextInstruction, /// Branch to given frame. Branch(usize), /// Execute function call. ExecuteCall(FuncRef), /// End current frame. End, /// Return from current function block. Return, } /// Function run result. enum RunResult { /// Function has returned (optional) value. Return(Option), /// Function is calling other function. NestedCall(FuncRef), } impl<'a, E: Externals> Interpreter<'a, E> { pub fn new(externals: &'a mut E) -> Interpreter<'a, E> { Interpreter { externals, } } pub fn start_execution(&mut self, func: &FuncRef, args: &[RuntimeValue]) -> Result, Trap> { let context = FunctionContext::new( func.clone(), DEFAULT_VALUE_STACK_LIMIT, DEFAULT_FRAME_STACK_LIMIT, func.signature(), args.into_iter().cloned().collect(), ); let mut function_stack = VecDeque::new(); function_stack.push_back(context); self.run_interpreter_loop(&mut function_stack) } fn run_interpreter_loop(&mut self, function_stack: &mut VecDeque) -> Result, Trap> { loop { let mut function_context = function_stack.pop_back().expect("on loop entry - not empty; on loop continue - checking for emptiness; qed"); let function_ref = function_context.function.clone(); let function_body = function_ref .body() .expect( "Host functions checked in function_return below; Internal functions always have a body; qed" ); if !function_context.is_initialized() { let return_type = function_context.return_type; function_context.initialize(&function_body.locals); function_context.push_frame(&function_body.labels, BlockFrameType::Function, return_type).map_err(Trap::new)?; } let function_return = self.do_run_function(&mut function_context, function_body.opcodes.elements(), &function_body.labels).map_err(Trap::new)?; match function_return { RunResult::Return(return_value) => { match function_stack.back_mut() { Some(caller_context) => if let Some(return_value) = return_value { caller_context.value_stack_mut().push(return_value).map_err(Trap::new)?; }, None => return Ok(return_value), } }, RunResult::NestedCall(nested_func) => { match *nested_func.as_internal() { FuncInstanceInternal::Internal { .. } => { let nested_context = function_context.nested(nested_func.clone()).map_err(Trap::new)?; function_stack.push_back(function_context); function_stack.push_back(nested_context); }, FuncInstanceInternal::Host { ref signature, .. } => { let args = prepare_function_args(signature, &mut function_context.value_stack); let return_val = FuncInstance::invoke(&nested_func, &args, self.externals)?; if let Some(return_val) = return_val { function_context.value_stack_mut().push(return_val).map_err(Trap::new)?; } function_stack.push_back(function_context); } } }, } } } fn do_run_function(&mut self, function_context: &mut FunctionContext, function_body: &[Opcode], function_labels: &HashMap) -> Result { loop { let instruction = &function_body[function_context.position]; match self.run_instruction(function_context, function_labels, instruction)? { InstructionOutcome::RunNextInstruction => function_context.position += 1, InstructionOutcome::Branch(mut index) => { // discard index - 1 blocks while index >= 1 { function_context.discard_frame(); index -= 1; } function_context.pop_frame(true)?; if function_context.frame_stack().is_empty() { break; } }, InstructionOutcome::ExecuteCall(func_ref) => { function_context.position += 1; return Ok(RunResult::NestedCall(func_ref)); }, InstructionOutcome::End => { if function_context.frame_stack().is_empty() { break; } }, InstructionOutcome::Return => break, } } Ok(RunResult::Return(match function_context.return_type { BlockType::Value(_) => { let result = function_context .value_stack_mut() .pop(); Some(result) }, BlockType::NoResult => None, })) } fn run_instruction(&mut self, context: &mut FunctionContext, labels: &HashMap, opcode: &Opcode) -> Result { match opcode { &Opcode::Unreachable => self.run_unreachable(context), &Opcode::Nop => self.run_nop(context), &Opcode::Block(block_type) => self.run_block(context, labels, block_type), &Opcode::Loop(block_type) => self.run_loop(context, labels, block_type), &Opcode::If(block_type) => self.run_if(context, labels, block_type), &Opcode::Else => self.run_else(context, labels), &Opcode::End => self.run_end(context), &Opcode::Br(idx) => self.run_br(context, idx), &Opcode::BrIf(idx) => self.run_br_if(context, idx), &Opcode::BrTable(ref table, default) => self.run_br_table(context, table, default), &Opcode::Return => self.run_return(context), &Opcode::Call(index) => self.run_call(context, index), &Opcode::CallIndirect(index, _reserved) => self.run_call_indirect(context, index), &Opcode::Drop => self.run_drop(context), &Opcode::Select => self.run_select(context), &Opcode::GetLocal(index) => self.run_get_local(context, index), &Opcode::SetLocal(index) => self.run_set_local(context, index), &Opcode::TeeLocal(index) => self.run_tee_local(context, index), &Opcode::GetGlobal(index) => self.run_get_global(context, index), &Opcode::SetGlobal(index) => self.run_set_global(context, index), &Opcode::I32Load(align, offset) => self.run_load::(context, align, offset), &Opcode::I64Load(align, offset) => self.run_load::(context, align, offset), &Opcode::F32Load(align, offset) => self.run_load::(context, align, offset), &Opcode::F64Load(align, offset) => self.run_load::(context, align, offset), &Opcode::I32Load8S(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I32Load8U(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I32Load16S(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I32Load16U(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I64Load8S(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I64Load8U(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I64Load16S(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I64Load16U(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I64Load32S(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I64Load32U(align, offset) => self.run_load_extend::(context, align, offset), &Opcode::I32Store(align, offset) => self.run_store::(context, align, offset), &Opcode::I64Store(align, offset) => self.run_store::(context, align, offset), &Opcode::F32Store(align, offset) => self.run_store::(context, align, offset), &Opcode::F64Store(align, offset) => self.run_store::(context, align, offset), &Opcode::I32Store8(align, offset) => self.run_store_wrap::(context, align, offset), &Opcode::I32Store16(align, offset) => self.run_store_wrap::(context, align, offset), &Opcode::I64Store8(align, offset) => self.run_store_wrap::(context, align, offset), &Opcode::I64Store16(align, offset) => self.run_store_wrap::(context, align, offset), &Opcode::I64Store32(align, offset) => self.run_store_wrap::(context, align, offset), &Opcode::CurrentMemory(_) => self.run_current_memory(context), &Opcode::GrowMemory(_) => self.run_grow_memory(context), &Opcode::I32Const(val) => self.run_const(context, val.into()), &Opcode::I64Const(val) => self.run_const(context, val.into()), &Opcode::F32Const(val) => self.run_const(context, RuntimeValue::decode_f32(val)), &Opcode::F64Const(val) => self.run_const(context, RuntimeValue::decode_f64(val)), &Opcode::I32Eqz => self.run_eqz::(context), &Opcode::I32Eq => self.run_eq::(context), &Opcode::I32Ne => self.run_ne::(context), &Opcode::I32LtS => self.run_lt::(context), &Opcode::I32LtU => self.run_lt::(context), &Opcode::I32GtS => self.run_gt::(context), &Opcode::I32GtU => self.run_gt::(context), &Opcode::I32LeS => self.run_lte::(context), &Opcode::I32LeU => self.run_lte::(context), &Opcode::I32GeS => self.run_gte::(context), &Opcode::I32GeU => self.run_gte::(context), &Opcode::I64Eqz => self.run_eqz::(context), &Opcode::I64Eq => self.run_eq::(context), &Opcode::I64Ne => self.run_ne::(context), &Opcode::I64LtS => self.run_lt::(context), &Opcode::I64LtU => self.run_lt::(context), &Opcode::I64GtS => self.run_gt::(context), &Opcode::I64GtU => self.run_gt::(context), &Opcode::I64LeS => self.run_lte::(context), &Opcode::I64LeU => self.run_lte::(context), &Opcode::I64GeS => self.run_gte::(context), &Opcode::I64GeU => self.run_gte::(context), &Opcode::F32Eq => self.run_eq::(context), &Opcode::F32Ne => self.run_ne::(context), &Opcode::F32Lt => self.run_lt::(context), &Opcode::F32Gt => self.run_gt::(context), &Opcode::F32Le => self.run_lte::(context), &Opcode::F32Ge => self.run_gte::(context), &Opcode::F64Eq => self.run_eq::(context), &Opcode::F64Ne => self.run_ne::(context), &Opcode::F64Lt => self.run_lt::(context), &Opcode::F64Gt => self.run_gt::(context), &Opcode::F64Le => self.run_lte::(context), &Opcode::F64Ge => self.run_gte::(context), &Opcode::I32Clz => self.run_clz::(context), &Opcode::I32Ctz => self.run_ctz::(context), &Opcode::I32Popcnt => self.run_popcnt::(context), &Opcode::I32Add => self.run_add::(context), &Opcode::I32Sub => self.run_sub::(context), &Opcode::I32Mul => self.run_mul::(context), &Opcode::I32DivS => self.run_div::(context), &Opcode::I32DivU => self.run_div::(context), &Opcode::I32RemS => self.run_rem::(context), &Opcode::I32RemU => self.run_rem::(context), &Opcode::I32And => self.run_and::(context), &Opcode::I32Or => self.run_or::(context), &Opcode::I32Xor => self.run_xor::(context), &Opcode::I32Shl => self.run_shl::(context, 0x1F), &Opcode::I32ShrS => self.run_shr::(context, 0x1F), &Opcode::I32ShrU => self.run_shr::(context, 0x1F), &Opcode::I32Rotl => self.run_rotl::(context), &Opcode::I32Rotr => self.run_rotr::(context), &Opcode::I64Clz => self.run_clz::(context), &Opcode::I64Ctz => self.run_ctz::(context), &Opcode::I64Popcnt => self.run_popcnt::(context), &Opcode::I64Add => self.run_add::(context), &Opcode::I64Sub => self.run_sub::(context), &Opcode::I64Mul => self.run_mul::(context), &Opcode::I64DivS => self.run_div::(context), &Opcode::I64DivU => self.run_div::(context), &Opcode::I64RemS => self.run_rem::(context), &Opcode::I64RemU => self.run_rem::(context), &Opcode::I64And => self.run_and::(context), &Opcode::I64Or => self.run_or::(context), &Opcode::I64Xor => self.run_xor::(context), &Opcode::I64Shl => self.run_shl::(context, 0x3F), &Opcode::I64ShrS => self.run_shr::(context, 0x3F), &Opcode::I64ShrU => self.run_shr::(context, 0x3F), &Opcode::I64Rotl => self.run_rotl::(context), &Opcode::I64Rotr => self.run_rotr::(context), &Opcode::F32Abs => self.run_abs::(context), &Opcode::F32Neg => self.run_neg::(context), &Opcode::F32Ceil => self.run_ceil::(context), &Opcode::F32Floor => self.run_floor::(context), &Opcode::F32Trunc => self.run_trunc::(context), &Opcode::F32Nearest => self.run_nearest::(context), &Opcode::F32Sqrt => self.run_sqrt::(context), &Opcode::F32Add => self.run_add::(context), &Opcode::F32Sub => self.run_sub::(context), &Opcode::F32Mul => self.run_mul::(context), &Opcode::F32Div => self.run_div::(context), &Opcode::F32Min => self.run_min::(context), &Opcode::F32Max => self.run_max::(context), &Opcode::F32Copysign => self.run_copysign::(context), &Opcode::F64Abs => self.run_abs::(context), &Opcode::F64Neg => self.run_neg::(context), &Opcode::F64Ceil => self.run_ceil::(context), &Opcode::F64Floor => self.run_floor::(context), &Opcode::F64Trunc => self.run_trunc::(context), &Opcode::F64Nearest => self.run_nearest::(context), &Opcode::F64Sqrt => self.run_sqrt::(context), &Opcode::F64Add => self.run_add::(context), &Opcode::F64Sub => self.run_sub::(context), &Opcode::F64Mul => self.run_mul::(context), &Opcode::F64Div => self.run_div::(context), &Opcode::F64Min => self.run_min::(context), &Opcode::F64Max => self.run_max::(context), &Opcode::F64Copysign => self.run_copysign::(context), &Opcode::I32WrapI64 => self.run_wrap::(context), &Opcode::I32TruncSF32 => self.run_trunc_to_int::(context), &Opcode::I32TruncUF32 => self.run_trunc_to_int::(context), &Opcode::I32TruncSF64 => self.run_trunc_to_int::(context), &Opcode::I32TruncUF64 => self.run_trunc_to_int::(context), &Opcode::I64ExtendSI32 => self.run_extend::(context), &Opcode::I64ExtendUI32 => self.run_extend::(context), &Opcode::I64TruncSF32 => self.run_trunc_to_int::(context), &Opcode::I64TruncUF32 => self.run_trunc_to_int::(context), &Opcode::I64TruncSF64 => self.run_trunc_to_int::(context), &Opcode::I64TruncUF64 => self.run_trunc_to_int::(context), &Opcode::F32ConvertSI32 => self.run_extend::(context), &Opcode::F32ConvertUI32 => self.run_extend::(context), &Opcode::F32ConvertSI64 => self.run_wrap::(context), &Opcode::F32ConvertUI64 => self.run_wrap::(context), &Opcode::F32DemoteF64 => self.run_wrap::(context), &Opcode::F64ConvertSI32 => self.run_extend::(context), &Opcode::F64ConvertUI32 => self.run_extend::(context), &Opcode::F64ConvertSI64 => self.run_extend::(context), &Opcode::F64ConvertUI64 => self.run_extend::(context), &Opcode::F64PromoteF32 => self.run_extend::(context), &Opcode::I32ReinterpretF32 => self.run_reinterpret::(context), &Opcode::I64ReinterpretF64 => self.run_reinterpret::(context), &Opcode::F32ReinterpretI32 => self.run_reinterpret::(context), &Opcode::F64ReinterpretI64 => self.run_reinterpret::(context), } } fn run_unreachable(&mut self, _context: &mut FunctionContext) -> Result { Err(TrapKind::Unreachable) } fn run_nop(&mut self, _context: &mut FunctionContext) -> Result { Ok(InstructionOutcome::RunNextInstruction) } fn run_block(&mut self, context: &mut FunctionContext, labels: &HashMap, block_type: BlockType) -> Result { context.push_frame(labels, BlockFrameType::Block, block_type)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_loop(&mut self, context: &mut FunctionContext, labels: &HashMap, block_type: BlockType) -> Result { context.push_frame(labels, BlockFrameType::Loop, block_type)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_if(&mut self, context: &mut FunctionContext, labels: &HashMap, block_type: BlockType) -> Result { let condition: bool = context .value_stack_mut() .pop_as(); let block_frame_type = if condition { BlockFrameType::IfTrue } else { let else_pos = labels[&context.position]; if !labels.contains_key(&else_pos) { context.position = else_pos; return Ok(InstructionOutcome::RunNextInstruction); } context.position = else_pos; BlockFrameType::IfFalse }; context.push_frame(labels, block_frame_type, block_type)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_else(&mut self, context: &mut FunctionContext, labels: &HashMap) -> Result { let end_pos = labels[&context.position]; context.pop_frame(false)?; context.position = end_pos; Ok(InstructionOutcome::RunNextInstruction) } fn run_end(&mut self, context: &mut FunctionContext) -> Result { context.pop_frame(false)?; Ok(InstructionOutcome::End) } fn run_br(&mut self, _context: &mut FunctionContext, label_idx: u32) -> Result { Ok(InstructionOutcome::Branch(label_idx as usize)) } fn run_br_if(&mut self, context: &mut FunctionContext, label_idx: u32) -> Result { let condition = context.value_stack_mut().pop_as(); if condition { Ok(InstructionOutcome::Branch(label_idx as usize)) } else { Ok(InstructionOutcome::RunNextInstruction) } } fn run_br_table(&mut self, context: &mut FunctionContext, table: &[u32], default: u32) -> Result { let index: u32 = context.value_stack_mut() .pop_as(); Ok(InstructionOutcome::Branch(table.get(index as usize).cloned().unwrap_or(default) as usize)) } fn run_return(&mut self, _context: &mut FunctionContext) -> Result { Ok(InstructionOutcome::Return) } fn run_call( &mut self, context: &mut FunctionContext, func_idx: u32, ) -> Result { let func = context .module() .func_by_index(func_idx) .expect("Due to validation func should exists"); Ok(InstructionOutcome::ExecuteCall(func)) } fn run_call_indirect( &mut self, context: &mut FunctionContext, signature_idx: u32, ) -> Result { let table_func_idx: u32 = context .value_stack_mut() .pop_as(); let table = context .module() .table_by_index(DEFAULT_TABLE_INDEX) .expect("Due to validation table should exists"); let func_ref = table.get(table_func_idx) .map_err(|_| TrapKind::TableAccessOutOfBounds)? .ok_or_else(|| TrapKind::ElemUninitialized)?; { let actual_function_type = func_ref.signature(); let required_function_type = context .module() .signature_by_index(signature_idx) .expect("Due to validation type should exists"); if &*required_function_type != actual_function_type { return Err(TrapKind::UnexpectedSignature); } } Ok(InstructionOutcome::ExecuteCall(func_ref)) } fn run_drop(&mut self, context: &mut FunctionContext) -> Result { let _ = context .value_stack_mut() .pop(); Ok(InstructionOutcome::RunNextInstruction) } fn run_select(&mut self, context: &mut FunctionContext) -> Result { let (left, mid, right) = context .value_stack_mut() .pop_triple(); let condition = right .try_into() .expect("Due to validation stack top should be I32"); let val = if condition { left } else { mid }; context.value_stack_mut().push(val)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_get_local(&mut self, context: &mut FunctionContext, index: u32) -> Result { let val = context.get_local(index as usize); context.value_stack_mut().push(val)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_set_local(&mut self, context: &mut FunctionContext, index: u32) -> Result { let arg = context .value_stack_mut() .pop(); context.set_local(index as usize, arg); Ok(InstructionOutcome::RunNextInstruction) } fn run_tee_local(&mut self, context: &mut FunctionContext, index: u32) -> Result { let arg = context .value_stack() .top() .clone(); context.set_local(index as usize, arg); Ok(InstructionOutcome::RunNextInstruction) } fn run_get_global( &mut self, context: &mut FunctionContext, index: u32, ) -> Result { let global = context .module() .global_by_index(index) .expect("Due to validation global should exists"); let val = global.get(); context.value_stack_mut().push(val)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_set_global( &mut self, context: &mut FunctionContext, index: u32, ) -> Result { let val = context .value_stack_mut() .pop(); let global = context .module() .global_by_index(index) .expect("Due to validation global should exists"); global.set(val).expect("Due to validation set to a global should succeed"); Ok(InstructionOutcome::RunNextInstruction) } fn run_load(&mut self, context: &mut FunctionContext, _align: u32, offset: u32) -> Result where RuntimeValue: From, T: LittleEndianConvert { let raw_address = context .value_stack_mut() .pop_as(); let address = effective_address( offset, raw_address, )?; let m = context.module() .memory_by_index(DEFAULT_MEMORY_INDEX) .expect("Due to validation memory should exists"); let b = m.get(address, mem::size_of::()) .map_err(|_| TrapKind::MemoryAccessOutOfBounds)?; let n = T::from_little_endian(&b) .expect("Can't fail since buffer length should be size_of::"); context.value_stack_mut().push(n.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_load_extend(&mut self, context: &mut FunctionContext, _align: u32, offset: u32) -> Result where T: ExtendInto, RuntimeValue: From, T: LittleEndianConvert { let raw_address = context .value_stack_mut() .pop_as(); let address = effective_address( offset, raw_address, )?; let m = context.module() .memory_by_index(DEFAULT_MEMORY_INDEX) .expect("Due to validation memory should exists"); let b = m.get(address, mem::size_of::()) .map_err(|_| TrapKind::MemoryAccessOutOfBounds)?; let v = T::from_little_endian(&b) .expect("Can't fail since buffer length should be size_of::"); let stack_value: U = v.extend_into(); context .value_stack_mut() .push(stack_value.into()) .map_err(Into::into) .map(|_| InstructionOutcome::RunNextInstruction) } fn run_store(&mut self, context: &mut FunctionContext, _align: u32, offset: u32) -> Result where RuntimeValue: TryInto, T: LittleEndianConvert { let stack_value = context .value_stack_mut() .pop_as::() .into_little_endian(); let raw_address = context .value_stack_mut() .pop_as::(); let address = effective_address( offset, raw_address, )?; let m = context.module() .memory_by_index(DEFAULT_MEMORY_INDEX) .expect("Due to validation memory should exists"); m.set(address, &stack_value) .map_err(|_| TrapKind::MemoryAccessOutOfBounds)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_store_wrap( &mut self, context: &mut FunctionContext, _align: u32, offset: u32, ) -> Result where RuntimeValue: TryInto, T: WrapInto, U: LittleEndianConvert, { let stack_value: T = context .value_stack_mut() .pop() .try_into() .expect("Due to validation value should be of proper type"); let stack_value = stack_value.wrap_into().into_little_endian(); let raw_address = context .value_stack_mut() .pop_as::(); let address = effective_address( offset, raw_address, )?; let m = context.module() .memory_by_index(DEFAULT_MEMORY_INDEX) .expect("Due to validation memory should exists"); m.set(address, &stack_value) .map_err(|_| TrapKind::MemoryAccessOutOfBounds)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_current_memory(&mut self, context: &mut FunctionContext) -> Result { let m = context.module() .memory_by_index(DEFAULT_MEMORY_INDEX) .expect("Due to validation memory should exists"); let s = m.current_size().0; context .value_stack_mut() .push(RuntimeValue::I32(s as i32))?; Ok(InstructionOutcome::RunNextInstruction) } fn run_grow_memory(&mut self, context: &mut FunctionContext) -> Result { let pages: u32 = context .value_stack_mut() .pop_as(); let m = context.module() .memory_by_index(DEFAULT_MEMORY_INDEX) .expect("Due to validation memory should exists"); let m = match m.grow(Pages(pages as usize)) { Ok(Pages(new_size)) => new_size as u32, Err(_) => u32::MAX, // Returns -1 (or 0xFFFFFFFF) in case of error. }; context .value_stack_mut() .push(RuntimeValue::I32(m as i32))?; Ok(InstructionOutcome::RunNextInstruction) } fn run_const(&mut self, context: &mut FunctionContext, val: RuntimeValue) -> Result { context .value_stack_mut() .push(val) .map_err(Into::into) .map(|_| InstructionOutcome::RunNextInstruction) } fn run_relop(&mut self, context: &mut FunctionContext, f: F) -> Result where RuntimeValue: TryInto, F: FnOnce(T, T) -> bool, { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = if f(left, right) { RuntimeValue::I32(1) } else { RuntimeValue::I32(0) }; context.value_stack_mut().push(v)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_eqz(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialEq + Default { let v = context .value_stack_mut() .pop_as::(); let v = RuntimeValue::I32(if v == Default::default() { 1 } else { 0 }); context.value_stack_mut().push(v)?; Ok(InstructionOutcome::RunNextInstruction) } fn run_eq(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialEq { self.run_relop(context, |left, right| left == right) } fn run_ne(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialEq { self.run_relop(context, |left, right| left != right) } fn run_lt(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialOrd + Display { self.run_relop(context, |left, right| left < right) } fn run_gt(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialOrd { self.run_relop(context, |left, right| left > right) } fn run_lte(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialOrd { self.run_relop(context, |left, right| left <= right) } fn run_gte(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: TryInto, T: PartialOrd { self.run_relop(context, |left, right| left >= right) } fn run_unop(&mut self, context: &mut FunctionContext, f: F) -> Result where F: FnOnce(T) -> U, RuntimeValue: From + TryInto { let v = context .value_stack_mut() .pop_as::(); let v = f(v); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_clz(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Integer { self.run_unop(context, |v| v.leading_zeros()) } fn run_ctz(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Integer { self.run_unop(context, |v| v.trailing_zeros()) } fn run_popcnt(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Integer { self.run_unop(context, |v| v.count_ones()) } fn run_add(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: ArithmeticOps { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.add(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_sub(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: ArithmeticOps { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.sub(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_mul(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: ArithmeticOps { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.mul(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_div(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: TransmuteInto + Display, U: ArithmeticOps + TransmuteInto { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let (left, right) = (left.transmute_into(), right.transmute_into()); let v = left.div(right)?; let v = v.transmute_into(); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_rem(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: TransmuteInto, U: Integer + TransmuteInto { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let (left, right) = (left.transmute_into(), right.transmute_into()); let v = left.rem(right)?; let v = v.transmute_into(); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_and(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From<::Output> + TryInto, T: ops::BitAnd { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.bitand(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_or(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From<::Output> + TryInto, T: ops::BitOr { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.bitor(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_xor(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From<::Output> + TryInto, T: ops::BitXor { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.bitxor(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_shl(&mut self, context: &mut FunctionContext, mask: T) -> Result where RuntimeValue: From<>::Output> + TryInto, T: ops::Shl + ops::BitAnd { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.shl(right & mask); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_shr(&mut self, context: &mut FunctionContext, mask: U) -> Result where RuntimeValue: From + TryInto, T: TransmuteInto, U: ops::Shr + ops::BitAnd, >::Output: TransmuteInto { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let (left, right) = (left.transmute_into(), right.transmute_into()); let v = left.shr(right & mask); let v = v.transmute_into(); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_rotl(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Integer { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.rotl(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_rotr(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Integer { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.rotr(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_abs(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { self.run_unop(context, |v| v.abs()) } fn run_neg(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From<::Output> + TryInto, T: ops::Neg { self.run_unop(context, |v| v.neg()) } fn run_ceil(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { self.run_unop(context, |v| v.ceil()) } fn run_floor(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { self.run_unop(context, |v| v.floor()) } fn run_trunc(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { self.run_unop(context, |v| v.trunc()) } fn run_nearest(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { self.run_unop(context, |v| v.nearest()) } fn run_sqrt(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { self.run_unop(context, |v| v.sqrt()) } fn run_min(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.min(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_max(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.max(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_copysign(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: Float { let (left, right) = context .value_stack_mut() .pop_pair_as::() .expect("Due to validation stack should contain pair of values"); let v = left.copysign(right); context.value_stack_mut().push(v.into())?; Ok(InstructionOutcome::RunNextInstruction) } fn run_wrap(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: WrapInto { self.run_unop(context, |v| v.wrap_into()) } fn run_trunc_to_int(&mut self, context: &mut FunctionContext) -> Result where RuntimeValue: From + TryInto, T: TryTruncateInto, U: TransmuteInto, { let v = context .value_stack_mut() .pop_as::(); v.try_truncate_into() .map(|v| v.transmute_into()) .map(|v| context.value_stack_mut().push(v.into())) .map(|_| InstructionOutcome::RunNextInstruction) } fn run_extend