mirror of
https://github.com/fluencelabs/parity-wasm
synced 2025-06-26 05:02:03 +00:00
Implement emscripten mod in terms of native mod
This commit is contained in:
Sergey Pepyakin
@ -2,21 +2,15 @@
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//! from the Emscripten runtime, such as `STACKTOP` or `abort`.
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use std::sync::{Arc, Weak};
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use std::collections::HashMap;
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use builder::module;
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use elements::{Module, ExportEntry, Internal, GlobalEntry, GlobalType,
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ValueType, InitExpr, Opcode, Opcodes};
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use elements::{ExportEntry, Internal, ValueType};
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use interpreter::Error;
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use interpreter::native::{NATIVE_INDEX_FUNC_MIN, UserFunctionExecutor, UserDefinedElements, UserFunctionDescriptor, native_module};
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use interpreter::module::{ModuleInstanceInterface, ModuleInstance, ExecutionParams,
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ItemIndex, CallerContext, ExportEntryType, InternalFunctionReference, InternalFunction, FunctionSignature};
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use interpreter::memory::{MemoryInstance, LINEAR_MEMORY_PAGE_SIZE};
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use interpreter::table::TableInstance;
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use interpreter::native::{native_module, UserDefinedElements, UserFunctionDescriptor, UserFunctionExecutor};
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use interpreter::module::{CallerContext, ModuleInstance, ModuleInstanceInterface};
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use interpreter::memory::LINEAR_MEMORY_PAGE_SIZE;
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use interpreter::value::RuntimeValue;
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use interpreter::variable::{VariableInstance, VariableType};
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/// Memory address, at which stack base begins.
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const DEFAULT_STACK_BASE: u32 = 0;
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/// Memory address, at which stack begins.
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const DEFAULT_STACK_TOP: u32 = 256 * 1024;
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/// Memory, allocated for stack.
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@ -39,42 +33,7 @@ const INDEX_MEMORY: u32 = 0;
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/// Index of default table.
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const INDEX_TABLE: u32 = 0;
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/// Index of STACK_BASE global variable.
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const INDEX_GLOBAL_STACK_BASE: u32 = 0;
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/// Index of STACK_TOP global variable.
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const INDEX_GLOBAL_STACK_TOP: u32 = 1;
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/// Index of STACK_MAX global variable.
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const INDEX_GLOBAL_STACK_MAX: u32 = 2;
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/// Index of DYNAMIC_BASE global variable.
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const INDEX_GLOBAL_DYNAMIC_BASE: u32 = 3;
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/// Index of DYNAMICTOP_PTR global variable.
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const INDEX_GLOBAL_DYNAMICTOP_PTR: u32 = 4;
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/// Index of TOTAL_MEMORY global variable.
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const INDEX_GLOBAL_TOTAL_MEMORY: u32 = 5;
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/// Index of ABORT global variable.
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const INDEX_GLOBAL_ABORT: u32 = 6;
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/// Index of EXITSTATUS global variable.
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const INDEX_GLOBAL_EXIT_STATUS: u32 = 7;
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/// Index of tableBase global variable.
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const INDEX_GLOBAL_TABLE_BASE: u32 = 8;
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/// Index of memoryBase global.
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const INDEX_GLOBAL_MEMORY_BASE: u32 = 9;
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/// Index of abort function.
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const INDEX_FUNC_ABORT: u32 = 0;
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/// Index of assert function.
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const INDEX_FUNC_ASSERT: u32 = 1;
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/// Index of enlargeMemory function.
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const INDEX_FUNC_ENLARGE_MEMORY: u32 = 2;
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/// Index of getTotalMemory function.
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const INDEX_FUNC_GET_TOTAL_MEMORY: u32 = 3;
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/// Min index of reserver function.
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const INDEX_FUNC_MIN_NONUSED: u32 = 4;
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/// Max index of reserved function.
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const INDEX_FUNC_MAX: u32 = NATIVE_INDEX_FUNC_MIN - 1;
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/// Emscripten environment parameters.
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#[derive(Clone)]
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pub struct EnvParams {
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/// Stack size in bytes.
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pub total_stack: u32,
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@ -89,7 +48,8 @@ pub struct EnvParams {
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}
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struct EmscriptenFunctionExecutor {
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params: EnvParams,
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abort_global: Arc<VariableInstance>,
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total_mem_global: Arc<VariableInstance>,
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}
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impl<'a> UserFunctionExecutor for EmscriptenFunctionExecutor {
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@ -99,96 +59,28 @@ impl<'a> UserFunctionExecutor for EmscriptenFunctionExecutor {
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context: CallerContext,
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) -> Result<Option<RuntimeValue>, Error> {
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match name {
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_ => Err(Error::Trap("not implemented".into()).into()),
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"_abort" => {
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self.abort_global.set(RuntimeValue::I32(1))?;
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Err(Error::Trap("abort".into()).into())
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}
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}
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}
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struct EmscriptenModuleInstance {
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_params: EnvParams,
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instance: ModuleInstance,
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}
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impl EmscriptenModuleInstance {
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pub fn new(params: EnvParams, module: Module) -> Result<Self, Error> {
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let mut instance = ModuleInstance::new(Weak::default(), "env".into(), module)?;
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instance.instantiate(None)?;
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Ok(EmscriptenModuleInstance {
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_params: params,
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instance: instance,
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})
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}
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}
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impl ModuleInstanceInterface for EmscriptenModuleInstance {
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fn execute_index(&self, index: u32, params: ExecutionParams) -> Result<Option<RuntimeValue>, Error> {
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self.instance.execute_index(index, params)
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}
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fn execute_export(&self, name: &str, params: ExecutionParams) -> Result<Option<RuntimeValue>, Error> {
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self.instance.execute_export(name, params)
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}
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fn export_entry<'a>(&self, name: &str, required_type: &ExportEntryType) -> Result<Internal, Error> {
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self.instance.export_entry(name, required_type)
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}
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fn table(&self, index: ItemIndex) -> Result<Arc<TableInstance>, Error> {
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self.instance.table(index)
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}
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fn memory(&self, index: ItemIndex) -> Result<Arc<MemoryInstance>, Error> {
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self.instance.memory(index)
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}
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fn global<'a>(&self, index: ItemIndex, variable_type: Option<VariableType>, externals: Option<&'a HashMap<String, Arc<ModuleInstanceInterface + 'a>>>) -> Result<Arc<VariableInstance>, Error> {
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self.instance.global(index, variable_type, externals)
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}
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fn function_type(&self, function_index: ItemIndex) -> Result<FunctionSignature, Error> {
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self.instance.function_type(function_index)
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}
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fn function_type_by_index(&self, type_index: u32) -> Result<FunctionSignature, Error> {
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self.instance.function_type_by_index(type_index)
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}
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fn function_reference<'a>(&self, index: ItemIndex, externals: Option<&'a HashMap<String, Arc<ModuleInstanceInterface + 'a>>>) -> Result<InternalFunctionReference<'a>, Error> {
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self.instance.function_reference(index, externals)
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}
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fn function_reference_indirect<'a>(&self, table_idx: u32, type_idx: u32, func_idx: u32, externals: Option<&'a HashMap<String, Arc<ModuleInstanceInterface + 'a>>>) -> Result<InternalFunctionReference<'a>, Error> {
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self.instance.function_reference_indirect(table_idx, type_idx, func_idx, externals)
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}
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fn function_body<'a>(&'a self, _internal_index: u32) -> Result<Option<InternalFunction<'a>>, Error> {
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Ok(None)
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}
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fn call_internal_function(&self, outer: CallerContext, index: u32) -> Result<Option<RuntimeValue>, Error> {
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// to make interpreter independent of *SCRIPTEN runtime, just make abort/assert = interpreter Error
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match index {
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INDEX_FUNC_ABORT => self.global(ItemIndex::IndexSpace(INDEX_GLOBAL_ABORT), Some(VariableType::I32), None)
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.and_then(|g| g.set(RuntimeValue::I32(1)))
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.and_then(|_| Err(Error::Trap("abort".into())))
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.map_err(Into::into),
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INDEX_FUNC_ASSERT => outer.value_stack.pop_as::<i32>()
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.and_then(|condition| if condition == 0 {
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self.global(ItemIndex::IndexSpace(INDEX_GLOBAL_ABORT), Some(VariableType::I32), None)
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.and_then(|g| g.set(RuntimeValue::I32(1)))
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.and_then(|_| Err(Error::Trap("assertion failed".into())))
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"assert" => {
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let condition = context.value_stack.pop_as::<i32>()?;
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if condition == 0 {
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self.abort_global.set(RuntimeValue::I32(1))?;
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Err(Error::Trap("assertion failed".into()))
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} else {
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Ok(None)
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})
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.map_err(Into::into),
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INDEX_FUNC_ENLARGE_MEMORY => Ok(Some(RuntimeValue::I32(0))), // TODO: support memory enlarge
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INDEX_FUNC_GET_TOTAL_MEMORY => self.global(ItemIndex::IndexSpace(INDEX_GLOBAL_TOTAL_MEMORY), Some(VariableType::I32), None)
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.map(|g| g.get())
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.map(Some)
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.map_err(Into::into),
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INDEX_FUNC_MIN_NONUSED ... INDEX_FUNC_MAX => Err(Error::Trap("unimplemented".into()).into()),
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_ => Err(Error::Trap(format!("trying to call function with index {} in env module", index)).into()),
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}
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}
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"enlargeMemory" => {
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// TODO: support memory enlarge
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Ok(Some(RuntimeValue::I32(0)))
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}
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"getTotalMemory" => {
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let total_memory = self.total_mem_global.get();
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Ok(Some(total_memory))
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}
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_ => Err(Error::Trap("not implemented".into()).into()),
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}
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}
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}
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@ -197,6 +89,12 @@ pub fn env_module(params: EnvParams) -> Result<Arc<ModuleInstanceInterface>, Err
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debug_assert!(params.total_stack < params.total_memory);
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debug_assert!((params.total_stack % LINEAR_MEMORY_PAGE_SIZE) == 0);
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debug_assert!((params.total_memory % LINEAR_MEMORY_PAGE_SIZE) == 0);
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let stack_top = params.static_size.unwrap_or(DEFAULT_STACK_TOP);
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// Build module with defined memory and table,
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// instantiate it and wrap into an Arc.
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let instance = {
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let builder = module()
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// memory regions
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.memory()
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@ -209,58 +107,125 @@ pub fn env_module(params: EnvParams) -> Result<Arc<ModuleInstanceInterface>, Err
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.with_min(params.table_size)
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.build()
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.with_export(ExportEntry::new("table".into(), Internal::Table(INDEX_TABLE)));
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let module = builder.build();
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let mut instance = ModuleInstance::new(Weak::default(), "env".into(), builder.build())?;
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instance.instantiate(None)?;
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Arc::new(instance)
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};
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let mut function_executor = EmscriptenFunctionExecutor {
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params: params.clone(),
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let abort_global = Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32(0)
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).unwrap()
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);
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let total_mem_global = Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32(params.total_memory as i32),
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).unwrap(),
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);
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let function_executor = EmscriptenFunctionExecutor {
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abort_global: Arc::clone(&abort_global),
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total_mem_global: Arc::clone(&total_mem_global),
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};
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const SIGNATURES: &'static [UserFunctionDescriptor] = &[
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UserFunctionDescriptor::Static(
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"getTotalMemory",
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&[],
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Some(ValueType::I32),
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),
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UserFunctionDescriptor::Static(
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"enlargeMemory",
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&[],
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Some(ValueType::I32),
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),
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UserFunctionDescriptor::Static(
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"assert",
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&[ValueType::I32],
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None,
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),
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UserFunctionDescriptor::Static(
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"abort",
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&[],
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None,
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),
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UserFunctionDescriptor::Static("_abort", &[], None),
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UserFunctionDescriptor::Static("assert", &[ValueType::I32], None),
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UserFunctionDescriptor::Static("enlargeMemory", &[], Some(ValueType::I32)),
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UserFunctionDescriptor::Static("getTotalMemory", &[], Some(ValueType::I32)),
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];
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let stack_top = params.static_size.unwrap_or(DEFAULT_STACK_TOP);
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let elements = UserDefinedElements {
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executor: Some(function_executor),
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globals: vec![
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("STACK_BASE".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(stack_top as i32)).unwrap())),
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("STACKTOP".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(stack_top as i32)).unwrap())),
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("STACK_MAX".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32((stack_top + params.total_stack) as i32)).unwrap())),
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("DYNAMIC_BASE".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32((stack_top + params.total_stack) as i32)).unwrap())),
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("DYNAMICTOP_PTR".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32((stack_top + params.total_stack) as i32)).unwrap())),
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("TOTAL_MEMORY".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(params.total_memory as i32)).unwrap())),
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("ABORT".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(0)).unwrap())),
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("EXITSTATUS".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(0)).unwrap())),
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("tableBase".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(DEFAULT_TABLE_BASE as i32)).unwrap())),
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("memoryBase".into(), Arc::new(VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(DEFAULT_MEMORY_BASE as i32)).unwrap())),
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].into_iter().collect(),
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(
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"STACK_BASE".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32(stack_top as i32),
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).unwrap(),
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),
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),
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(
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"STACKTOP".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32(stack_top as i32),
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).unwrap(),
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),
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),
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(
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"STACK_MAX".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32((stack_top + params.total_stack) as i32),
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).unwrap(),
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),
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),
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(
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"DYNAMIC_BASE".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32((stack_top + params.total_stack) as i32),
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).unwrap(),
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),
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),
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(
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"DYNAMICTOP_PTR".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32((stack_top + params.total_stack) as i32),
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).unwrap(),
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),
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),
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(
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"EXITSTATUS".into(),
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Arc::new(
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VariableInstance::new(false, VariableType::I32, RuntimeValue::I32(0)).unwrap(),
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),
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),
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(
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"tableBase".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32(DEFAULT_TABLE_BASE as i32),
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).unwrap(),
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),
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),
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(
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"memoryBase".into(),
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Arc::new(
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VariableInstance::new(
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false,
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VariableType::I32,
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RuntimeValue::I32(DEFAULT_MEMORY_BASE as i32),
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).unwrap(),
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),
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),
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("TOTAL_MEMORY".into(), total_mem_global),
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("ABORT".into(), abort_global),
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].into_iter()
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.collect(),
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functions: ::std::borrow::Cow::from(SIGNATURES),
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};
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let mut instance = ModuleInstance::new(Weak::default(), "env".into(), module)?;
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instance.instantiate(None)?;
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Ok(native_module(Arc::new(instance), elements)?)
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Ok(native_module(instance, elements)?)
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}
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impl Default for EnvParams {
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