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This commit is contained in:
Ivan Enderlin 2019-11-04 14:14:12 +01:00
parent 0e27f2fa72
commit 2a041f898e
4 changed files with 185 additions and 122 deletions
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18
lib/runtime-core-tests/tests/imports.rs
View File

@ -12,33 +12,46 @@ fn imported_functions_forms() {
(import "env" "memory" (memory 1 1))
(import "env" "callback_fn" (func $callback_fn (type $type)))
(import "env" "callback_closure" (func $callback_closure (type $type)))
(import "env" "callback_closure_with_env" (func $callback_closure_with_env (type $type)))
(import "env" "callback_fn_with_vmctx" (func $callback_fn_with_vmctx (type $type)))
(import "env" "callback_closure_with_vmctx" (func $callback_closure_with_vmctx (type $type)))
(import "env" "callback_fn_trap" (func $callback_fn_trap (type $type)))
(import "env" "callback_closure_trap" (func $callback_closure_trap (type $type)))
(import "env" "callback_fn_trap_with_vmctx" (func $callback_fn_trap_with_vmctx (type $type)))
(import "env" "callback_closure_trap_with_vmctx" (func $callback_closure_trap_with_vmctx (type $type)))
(func (export "function_fn") (type $type)
get_local 0
call $callback_fn)
(func (export "function_closure") (type $type)
get_local 0
call $callback_closure)
(func (export "function_closure_with_env") (type $type)
get_local 0
call $callback_closure_with_env)
(func (export "function_fn_with_vmctx") (type $type)
get_local 0
call $callback_fn_with_vmctx)
(func (export "function_closure_with_vmctx") (type $type)
get_local 0
call $callback_closure_with_vmctx)
(func (export "function_fn_trap") (type $type)
get_local 0
call $callback_fn_trap)
(func (export "function_closure_trap") (type $type)
get_local 0
call $callback_closure_trap)
(func (export "function_fn_trap_with_vmctx") (type $type)
get_local 0
call $callback_fn_trap_with_vmctx)
(func (export "function_closure_trap_with_vmctx") (type $type)
get_local 0
call $callback_closure_trap_with_vmctx))
@ -51,6 +64,7 @@ fn imported_functions_forms() {
const SHIFT: i32 = 10;
memory.view()[0].set(SHIFT);
let shift = 100;
let import_object = imports! {
"env" => {
@ -59,6 +73,9 @@ fn imported_functions_forms() {
"callback_closure" => Func::new(|n: i32| -> Result<i32, ()> {
Ok(n + 1)
}),
"callback_closure_with_env" => Func::new(move |n: i32| -> Result<i32, ()> {
Ok(shift + n + 1)
}),
"callback_fn_with_vmctx" => Func::new(callback_fn_with_vmctx),
"callback_closure_with_vmctx" => Func::new(|vmctx: &mut vm::Ctx, n: i32| -> Result<i32, ()> {
let memory = vmctx.memory(0);
@ -134,6 +151,7 @@ fn imported_functions_forms() {
call_and_assert!(function_fn, Ok(2));
call_and_assert!(function_closure, Ok(2));
call_and_assert!(function_closure_with_env, Ok(2 + shift));
call_and_assert!(function_fn_with_vmctx, Ok(2 + SHIFT));
call_and_assert!(function_closure_with_vmctx, Ok(2 + SHIFT));
call_and_assert!(

24
lib/runtime-core/src/backing.rs
View File

@ -586,18 +586,18 @@ fn import_functions(
if *expected_sig == *signature {
functions.push(vm::ImportedFunc {
func: func.inner(),
func_ctx: {
let _ = match ctx {
Context::External(ctx) => ctx,
Context::Internal => vmctx,
};
NonNull::new(Box::into_raw(Box::new(vm::FuncCtx {
vmctx: NonNull::new(vmctx).expect("`vmctx` must not be null."),
func_env: ptr::null_mut(),
})))
.unwrap()
},
func_ctx: NonNull::new(Box::into_raw(Box::new(vm::FuncCtx {
vmctx: NonNull::new(vmctx).expect("`vmctx` must not be null."),
func_env: match ctx {
Context::External(ctx) => {
NonNull::new(ctx).map(|pointer| {
pointer.cast() // `*mut vm::FuncEnv` was casted to `*mut vm::Ctx` to fit in `Context::External`. Cast it back.
})
}
Context::Internal => None,
},
})))
.unwrap(),
});
} else {
link_errors.push(LinkError::IncorrectImportSignature {

257
lib/runtime-core/src/typed_func.rs
View File

@ -175,7 +175,7 @@ where
Args: WasmTypeList,
Rets: WasmTypeList,
{
fn to_raw(&self) -> NonNull<vm::Func>;
fn to_raw(self) -> (NonNull<vm::Func>, Option<NonNull<vm::FuncEnv>>);
}
pub trait TrapEarly<Rets>
@ -208,10 +208,12 @@ where
}
/// Represents a function that can be used by WebAssembly.
#[allow(dead_code)]
pub struct Func<'a, Args = (), Rets = (), Inner: Kind = Wasm> {
inner: Inner,
f: NonNull<vm::Func>,
ctx: *mut vm::Ctx,
func: NonNull<vm::Func>,
func_env: Option<NonNull<vm::FuncEnv>>,
vmctx: *mut vm::Ctx,
_phantom: PhantomData<(&'a (), Args, Rets)>,
}
@ -225,19 +227,20 @@ where
{
pub(crate) unsafe fn from_raw_parts(
inner: Wasm,
f: NonNull<vm::Func>,
ctx: *mut vm::Ctx,
func: NonNull<vm::Func>,
vmctx: *mut vm::Ctx,
) -> Func<'a, Args, Rets, Wasm> {
Func {
inner,
f,
ctx,
func,
func_env: None,
vmctx,
_phantom: PhantomData,
}
}
pub fn get_vm_func(&self) -> NonNull<vm::Func> {
self.f
self.func
}
}
@ -246,15 +249,18 @@ where
Args: WasmTypeList,
Rets: WasmTypeList,
{
pub fn new<F, Kind>(f: F) -> Func<'a, Args, Rets, Host>
pub fn new<F, Kind>(func: F) -> Func<'a, Args, Rets, Host>
where
Kind: ExternalFunctionKind,
F: ExternalFunction<Kind, Args, Rets>,
{
let (func, func_env) = func.to_raw();
Func {
inner: Host(()),
f: f.to_raw(),
ctx: ptr::null_mut(),
func,
func_env,
vmctx: ptr::null_mut(),
_phantom: PhantomData,
}
}
@ -391,7 +397,7 @@ where
Rets: WasmTypeList,
{
pub fn call(&self, a: A) -> Result<Rets, RuntimeError> {
unsafe { <A as WasmTypeList>::call(a, self.f, self.inner, self.ctx) }
unsafe { <A as WasmTypeList>::call(a, self.func, self.inner, self.vmctx) }
}
}
@ -482,57 +488,75 @@ macro_rules! impl_traits {
$( $x: WasmExternType, )*
Rets: WasmTypeList,
Trap: TrapEarly<Rets>,
FN: Fn(&mut vm::Ctx $( , $x )*) -> Trap,
FN: Fn(&mut vm::Ctx $( , $x )*) -> Trap + 'static,
{
#[allow(non_snake_case)]
fn to_raw(&self) -> NonNull<vm::Func> {
if mem::size_of::<Self>() == 0 {
/// This is required for the llvm backend to be able to unwind through this function.
#[cfg_attr(nightly, unwind(allowed))]
extern fn wrap<$( $x, )* Rets, Trap, FN>(
func_ctx: &mut vm::FuncCtx $( , $x: <$x as WasmExternType>::Native )*
) -> Rets::CStruct
where
$( $x: WasmExternType, )*
Rets: WasmTypeList,
Trap: TrapEarly<Rets>,
FN: Fn(&mut vm::Ctx, $( $x, )*) -> Trap,
{
let vmctx = unsafe { func_ctx.vmctx.as_mut() };
let f: FN = unsafe { mem::transmute_copy(&()) };
fn to_raw(self) -> (NonNull<vm::Func>, Option<NonNull<vm::FuncEnv>>) {
/// This is required for the llvm backend to be able to unwind through this function.
#[cfg_attr(nightly, unwind(allowed))]
extern fn wrap<$( $x, )* Rets, Trap, FN>(
func_ctx: &mut vm::FuncCtx $( , $x: <$x as WasmExternType>::Native )*
) -> Rets::CStruct
where
$( $x: WasmExternType, )*
Rets: WasmTypeList,
Trap: TrapEarly<Rets>,
FN: Fn(&mut vm::Ctx, $( $x, )*) -> Trap,
{
dbg!(func_ctx.vmctx.as_ptr());
let err = match panic::catch_unwind(
panic::AssertUnwindSafe(
|| {
f(vmctx $( , WasmExternType::from_native($x) )* ).report()
}
)
) {
Ok(Ok(returns)) => return returns.into_c_struct(),
Ok(Err(err)) => {
let b: Box<_> = err.into();
b as Box<dyn Any>
},
Err(err) => err,
};
let vmctx = unsafe { func_ctx.vmctx.as_mut() };
let func_env = func_ctx.func_env;
unsafe {
(&*vmctx.module).runnable_module.do_early_trap(err)
}
dbg!(func_env);
let func: &FN = match func_env {
Some(func_env) => unsafe {
let func: NonNull<FN> = func_env.cast();
&*func.as_ptr()
},
None => unsafe { mem::transmute_copy(&()) }
};
let err = match panic::catch_unwind(
panic::AssertUnwindSafe(
|| {
func(vmctx $( , WasmExternType::from_native($x) )* ).report()
}
)
) {
Ok(Ok(returns)) => return returns.into_c_struct(),
Ok(Err(err)) => {
let b: Box<_> = err.into();
b as Box<dyn Any>
},
Err(err) => err,
};
unsafe {
(&*vmctx.module).runnable_module.do_early_trap(err)
}
NonNull::new(wrap::<$( $x, )* Rets, Trap, Self> as *mut vm::Func).unwrap()
} else {
assert_eq!(
mem::size_of::<Self>(),
mem::size_of::<usize>(),
"you cannot use a closure that captures state for `Func`."
);
NonNull::new(unsafe {
mem::transmute_copy::<_, *mut vm::Func>(self)
}).unwrap()
}
let func_env: Option<NonNull<vm::FuncEnv>> =
// `FN` is a function pointer, or a closure
// _without_ a captured environment.
if mem::size_of::<Self>() == 0 {
None
}
// `FN` is a closure _with_ a captured
// environment. Grab it.
else {
NonNull::new(Box::into_raw(Box::new(self))).map(NonNull::cast)
};
dbg!(func_env);
(
NonNull::new(wrap::<$( $x, )* Rets, Trap, Self> as *mut vm::Func).unwrap(),
func_env
)
}
}
@ -541,57 +565,75 @@ macro_rules! impl_traits {
$( $x: WasmExternType, )*
Rets: WasmTypeList,
Trap: TrapEarly<Rets>,
FN: Fn($( $x, )*) -> Trap,
FN: Fn($( $x, )*) -> Trap + 'static,
{
#[allow(non_snake_case)]
fn to_raw(&self) -> NonNull<vm::Func> {
if mem::size_of::<Self>() == 0 {
/// This is required for the llvm backend to be able to unwind through this function.
#[cfg_attr(nightly, unwind(allowed))]
extern fn wrap<$( $x, )* Rets, Trap, FN>(
func_ctx: &mut vm::FuncCtx $( , $x: <$x as WasmExternType>::Native )*
) -> Rets::CStruct
where
$( $x: WasmExternType, )*
Rets: WasmTypeList,
Trap: TrapEarly<Rets>,
FN: Fn($( $x, )*) -> Trap,
{
let vmctx = unsafe { func_ctx.vmctx.as_mut() };
let f: FN = unsafe { mem::transmute_copy(&()) };
fn to_raw(self) -> (NonNull<vm::Func>, Option<NonNull<vm::FuncEnv>>) {
/// This is required for the llvm backend to be able to unwind through this function.
#[cfg_attr(nightly, unwind(allowed))]
extern fn wrap<$( $x, )* Rets, Trap, FN>(
func_ctx: &mut vm::FuncCtx $( , $x: <$x as WasmExternType>::Native )*
) -> Rets::CStruct
where
$( $x: WasmExternType, )*
Rets: WasmTypeList,
Trap: TrapEarly<Rets>,
FN: Fn($( $x, )*) -> Trap,
{
dbg!(func_ctx.vmctx.as_ptr());
let err = match panic::catch_unwind(
panic::AssertUnwindSafe(
|| {
f($( WasmExternType::from_native($x), )* ).report()
}
)
) {
Ok(Ok(returns)) => return returns.into_c_struct(),
Ok(Err(err)) => {
let b: Box<_> = err.into();
b as Box<dyn Any>
},
Err(err) => err,
};
let vmctx = unsafe { func_ctx.vmctx.as_mut() };
let func_env = func_ctx.func_env;
unsafe {
(&*vmctx.module).runnable_module.do_early_trap(err)
}
dbg!(func_env);
let func: &FN = match func_env {
Some(func_env) => unsafe {
let func: NonNull<FN> = func_env.cast();
&*func.as_ptr()
},
None => unsafe { mem::transmute_copy(&()) }
};
let err = match panic::catch_unwind(
panic::AssertUnwindSafe(
|| {
func($( WasmExternType::from_native($x), )* ).report()
}
)
) {
Ok(Ok(returns)) => return returns.into_c_struct(),
Ok(Err(err)) => {
let b: Box<_> = err.into();
b as Box<dyn Any>
},
Err(err) => err,
};
unsafe {
(&*vmctx.module).runnable_module.do_early_trap(err)
}
NonNull::new(wrap::<$( $x, )* Rets, Trap, Self> as *mut vm::Func).unwrap()
} else {
assert_eq!(
mem::size_of::<Self>(),
mem::size_of::<usize>(),
"you cannot use a closure that captures state for `Func`."
);
NonNull::new(unsafe {
mem::transmute_copy::<_, *mut vm::Func>(self)
}).unwrap()
}
let func_env: Option<NonNull<vm::FuncEnv>> =
// `FN` is a function pointer, or a closure
// _without_ a captured environment.
if mem::size_of::<Self>() == 0 {
None
}
// `FN` is a closure _with_ a captured
// environment. Grab it.
else {
NonNull::new(Box::into_raw(Box::new(self))).map(NonNull::cast)
};
dbg!(func_env);
(
NonNull::new(wrap::<$( $x, )* Rets, Trap, Self> as *mut vm::Func).unwrap(),
func_env
)
}
}
@ -606,9 +648,9 @@ macro_rules! impl_traits {
unsafe {
<( $( $x ),* ) as WasmTypeList>::call(
( $( $x ),* ),
self.f,
self.func,
self.inner,
self.ctx
self.vmctx
)
}
}
@ -646,8 +688,11 @@ where
Inner: Kind,
{
fn to_export(&self) -> Export {
let func = unsafe { FuncPointer::new(self.f.as_ptr()) };
let ctx = Context::Internal;
let func = unsafe { FuncPointer::new(self.func.as_ptr()) };
let ctx = match self.func_env {
Some(func_env) => Context::External(func_env.cast().as_ptr()),
None => Context::Internal,
};
let signature = Arc::new(FuncSig::new(Args::types(), Rets::types()));
Export::Function {

8
lib/runtime-core/src/vm.rs
View File

@ -512,16 +512,16 @@ pub struct FuncEnv {
#[derive(Debug)]
#[repr(C)]
pub struct FuncCtx {
pub vmctx: NonNull<Ctx>,
pub func_env: *mut FuncEnv,
pub(crate) vmctx: NonNull<Ctx>,
pub(crate) func_env: Option<NonNull<FuncEnv>>,
}
/// An imported function, which contains the vmctx that owns this function.
#[derive(Debug, Clone)]
#[repr(C)]
pub struct ImportedFunc {
pub func: *const Func,
pub func_ctx: NonNull<FuncCtx>,
pub(crate) func: *const Func,
pub(crate) func_ctx: NonNull<FuncCtx>,
}
// manually implemented because ImportedFunc contains raw pointers