143 lines
3.3 KiB
Rust
143 lines
3.3 KiB
Rust
use std::rc::Rc;
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use std::fmt;
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use std::collections::HashMap;
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use std::borrow::Cow;
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use parity_wasm::elements::{Local, Opcodes};
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use {Error, Signature};
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use host::Externals;
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use runner::{prepare_function_args, FunctionContext, Interpreter};
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use value::RuntimeValue;
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use module::ModuleRef;
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use common::stack::StackWithLimit;
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use common::{DEFAULT_FRAME_STACK_LIMIT, DEFAULT_VALUE_STACK_LIMIT};
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#[derive(Clone, Debug)]
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pub struct FuncRef(Rc<FuncInstance>);
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impl FuncRef {
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pub fn alloc_host(signature: Signature, host_func_index: usize) -> FuncRef {
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let func = FuncInstance::Host {
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signature,
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host_func_index,
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};
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FuncRef(Rc::new(func))
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}
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pub fn signature(&self) -> &Signature {
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self.0.signature()
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}
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pub(crate) fn as_instance(&self) -> &FuncInstance {
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&self.0
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}
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}
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#[derive(Clone)]
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pub(crate) enum FuncInstance {
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Internal {
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signature: Rc<Signature>,
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module: ModuleRef,
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body: Rc<FuncBody>,
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},
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Host {
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signature: Signature,
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host_func_index: usize,
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},
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}
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impl fmt::Debug for FuncInstance {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&FuncInstance::Internal {
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ref signature,
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..
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} => {
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// We can't write description of self.module here, because it generate
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// debug string for function instances and this will lead to infinite loop.
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write!(
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f,
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"Internal {{ signature={:?} }}",
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signature,
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)
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}
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&FuncInstance::Host { ref signature, .. } => {
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write!(f, "Host {{ signature={:?} }}", signature)
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}
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}
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}
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}
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impl FuncInstance {
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pub(crate) fn alloc_internal(
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module: ModuleRef,
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signature: Rc<Signature>,
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body: FuncBody,
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) -> FuncRef {
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let func = FuncInstance::Internal {
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signature,
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module: module,
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body: Rc::new(body),
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};
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FuncRef(Rc::new(func))
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}
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pub fn signature(&self) -> &Signature {
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match *self {
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FuncInstance::Internal { ref signature, .. } => signature,
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FuncInstance::Host { ref signature, .. } => signature,
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}
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}
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pub(crate) fn body(&self) -> Option<Rc<FuncBody>> {
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match *self {
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FuncInstance::Internal { ref body, .. } => Some(Rc::clone(body)),
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FuncInstance::Host { .. } => None,
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}
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}
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pub(crate) fn invoke<E: Externals>(
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func: FuncRef,
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args: Cow<[RuntimeValue]>,
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externals: &mut E,
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) -> Result<Option<RuntimeValue>, Error> {
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enum InvokeKind<'a> {
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Internal(FunctionContext),
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Host(usize, &'a [RuntimeValue]),
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}
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let result = match *func.as_instance() {
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FuncInstance::Internal { ref signature, .. } => {
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let mut stack =
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StackWithLimit::with_data(args.into_iter().cloned(), DEFAULT_VALUE_STACK_LIMIT);
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let args = prepare_function_args(signature, &mut stack)?;
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let context = FunctionContext::new(
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func.clone(),
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DEFAULT_VALUE_STACK_LIMIT,
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DEFAULT_FRAME_STACK_LIMIT,
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signature,
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args,
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);
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InvokeKind::Internal(context)
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}
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FuncInstance::Host { ref host_func_index, .. } => {
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InvokeKind::Host(*host_func_index, &*args)
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}
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};
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match result {
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InvokeKind::Internal(ctx) => {
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let mut interpreter = Interpreter::new(externals);
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interpreter.run_function(ctx)
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}
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InvokeKind::Host(host_func, args) => externals.invoke_index(host_func, args),
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}
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}
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}
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#[derive(Clone, Debug)]
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pub struct FuncBody {
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pub locals: Vec<Local>,
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pub opcodes: Opcodes,
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pub labels: HashMap<usize, usize>,
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}
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