mirror of
https://github.com/denoland/deno.git
synced 2024-11-27 16:10:57 -05:00
11b1e901ad
Adds support for passing and returning structs as buffers to FFI. This does not implement fastapi support for structs. Needed for certain system APIs such as AppKit on macOS.
400 lines
12 KiB
Rust
400 lines
12 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
|
|
|
|
use crate::callback::PtrSymbol;
|
|
use crate::check_unstable2;
|
|
use crate::dlfcn::DynamicLibraryResource;
|
|
use crate::ir::*;
|
|
use crate::symbol::NativeType;
|
|
use crate::symbol::Symbol;
|
|
use crate::FfiPermissions;
|
|
use crate::ForeignFunction;
|
|
use deno_core::anyhow::anyhow;
|
|
use deno_core::error::type_error;
|
|
use deno_core::error::AnyError;
|
|
use deno_core::op;
|
|
use deno_core::serde_json::Value;
|
|
use deno_core::serde_v8;
|
|
use deno_core::v8;
|
|
use deno_core::ResourceId;
|
|
use libffi::middle::Arg;
|
|
use std::cell::RefCell;
|
|
use std::ffi::c_void;
|
|
use std::future::Future;
|
|
use std::rc::Rc;
|
|
|
|
// SAFETY: Makes an FFI call
|
|
unsafe fn ffi_call_rtype_struct(
|
|
cif: &libffi::middle::Cif,
|
|
fn_ptr: &libffi::middle::CodePtr,
|
|
call_args: Vec<Arg>,
|
|
out_buffer: *mut u8,
|
|
) -> NativeValue {
|
|
libffi::raw::ffi_call(
|
|
cif.as_raw_ptr(),
|
|
Some(*fn_ptr.as_safe_fun()),
|
|
out_buffer as *mut c_void,
|
|
call_args.as_ptr() as *mut *mut c_void,
|
|
);
|
|
NativeValue { void_value: () }
|
|
}
|
|
|
|
// A one-off synchronous FFI call.
|
|
pub(crate) fn ffi_call_sync<'scope>(
|
|
scope: &mut v8::HandleScope<'scope>,
|
|
args: v8::FunctionCallbackArguments,
|
|
symbol: &Symbol,
|
|
out_buffer: Option<OutBuffer>,
|
|
) -> Result<NativeValue, AnyError>
|
|
where
|
|
'scope: 'scope,
|
|
{
|
|
let Symbol {
|
|
parameter_types,
|
|
result_type,
|
|
cif,
|
|
ptr: fun_ptr,
|
|
..
|
|
} = symbol;
|
|
let mut ffi_args: Vec<NativeValue> =
|
|
Vec::with_capacity(parameter_types.len());
|
|
|
|
for (index, native_type) in parameter_types.iter().enumerate() {
|
|
let value = args.get(index as i32);
|
|
match native_type {
|
|
NativeType::Bool => {
|
|
ffi_args.push(ffi_parse_bool_arg(value)?);
|
|
}
|
|
NativeType::U8 => {
|
|
ffi_args.push(ffi_parse_u8_arg(value)?);
|
|
}
|
|
NativeType::I8 => {
|
|
ffi_args.push(ffi_parse_i8_arg(value)?);
|
|
}
|
|
NativeType::U16 => {
|
|
ffi_args.push(ffi_parse_u16_arg(value)?);
|
|
}
|
|
NativeType::I16 => {
|
|
ffi_args.push(ffi_parse_i16_arg(value)?);
|
|
}
|
|
NativeType::U32 => {
|
|
ffi_args.push(ffi_parse_u32_arg(value)?);
|
|
}
|
|
NativeType::I32 => {
|
|
ffi_args.push(ffi_parse_i32_arg(value)?);
|
|
}
|
|
NativeType::U64 => {
|
|
ffi_args.push(ffi_parse_u64_arg(scope, value)?);
|
|
}
|
|
NativeType::I64 => {
|
|
ffi_args.push(ffi_parse_i64_arg(scope, value)?);
|
|
}
|
|
NativeType::USize => {
|
|
ffi_args.push(ffi_parse_usize_arg(scope, value)?);
|
|
}
|
|
NativeType::ISize => {
|
|
ffi_args.push(ffi_parse_isize_arg(scope, value)?);
|
|
}
|
|
NativeType::F32 => {
|
|
ffi_args.push(ffi_parse_f32_arg(value)?);
|
|
}
|
|
NativeType::F64 => {
|
|
ffi_args.push(ffi_parse_f64_arg(value)?);
|
|
}
|
|
NativeType::Buffer => {
|
|
ffi_args.push(ffi_parse_buffer_arg(scope, value)?);
|
|
}
|
|
NativeType::Struct(_) => {
|
|
ffi_args.push(ffi_parse_struct_arg(scope, value)?);
|
|
}
|
|
NativeType::Pointer => {
|
|
ffi_args.push(ffi_parse_pointer_arg(scope, value)?);
|
|
}
|
|
NativeType::Function => {
|
|
ffi_args.push(ffi_parse_function_arg(scope, value)?);
|
|
}
|
|
NativeType::Void => {
|
|
unreachable!();
|
|
}
|
|
}
|
|
}
|
|
let call_args: Vec<Arg> = ffi_args
|
|
.iter()
|
|
.enumerate()
|
|
// SAFETY: Creating a `Arg` from a `NativeValue` is pretty safe.
|
|
.map(|(i, v)| unsafe { v.as_arg(parameter_types.get(i).unwrap()) })
|
|
.collect();
|
|
// SAFETY: types in the `Cif` match the actual calling convention and
|
|
// types of symbol.
|
|
unsafe {
|
|
Ok(match result_type {
|
|
NativeType::Void => NativeValue {
|
|
void_value: cif.call::<()>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::Bool => NativeValue {
|
|
bool_value: cif.call::<bool>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::U8 => NativeValue {
|
|
u8_value: cif.call::<u8>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::I8 => NativeValue {
|
|
i8_value: cif.call::<i8>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::U16 => NativeValue {
|
|
u16_value: cif.call::<u16>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::I16 => NativeValue {
|
|
i16_value: cif.call::<i16>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::U32 => NativeValue {
|
|
u32_value: cif.call::<u32>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::I32 => NativeValue {
|
|
i32_value: cif.call::<i32>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::U64 => NativeValue {
|
|
u64_value: cif.call::<u64>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::I64 => NativeValue {
|
|
i64_value: cif.call::<i64>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::USize => NativeValue {
|
|
usize_value: cif.call::<usize>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::ISize => NativeValue {
|
|
isize_value: cif.call::<isize>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::F32 => NativeValue {
|
|
f32_value: cif.call::<f32>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::F64 => NativeValue {
|
|
f64_value: cif.call::<f64>(*fun_ptr, &call_args),
|
|
},
|
|
NativeType::Pointer | NativeType::Function | NativeType::Buffer => {
|
|
NativeValue {
|
|
pointer: cif.call::<*mut c_void>(*fun_ptr, &call_args),
|
|
}
|
|
}
|
|
NativeType::Struct(_) => ffi_call_rtype_struct(
|
|
&symbol.cif,
|
|
&symbol.ptr,
|
|
call_args,
|
|
out_buffer.unwrap().0,
|
|
),
|
|
})
|
|
}
|
|
}
|
|
|
|
fn ffi_call(
|
|
call_args: Vec<NativeValue>,
|
|
cif: &libffi::middle::Cif,
|
|
fun_ptr: libffi::middle::CodePtr,
|
|
parameter_types: &[NativeType],
|
|
result_type: NativeType,
|
|
out_buffer: Option<OutBuffer>,
|
|
) -> Result<NativeValue, AnyError> {
|
|
let call_args: Vec<Arg> = call_args
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(index, ffi_arg)| {
|
|
// SAFETY: the union field is initialized
|
|
unsafe { ffi_arg.as_arg(parameter_types.get(index).unwrap()) }
|
|
})
|
|
.collect();
|
|
|
|
// SAFETY: types in the `Cif` match the actual calling convention and
|
|
// types of symbol.
|
|
unsafe {
|
|
Ok(match result_type {
|
|
NativeType::Void => NativeValue {
|
|
void_value: cif.call::<()>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::Bool => NativeValue {
|
|
bool_value: cif.call::<bool>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::U8 => NativeValue {
|
|
u8_value: cif.call::<u8>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::I8 => NativeValue {
|
|
i8_value: cif.call::<i8>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::U16 => NativeValue {
|
|
u16_value: cif.call::<u16>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::I16 => NativeValue {
|
|
i16_value: cif.call::<i16>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::U32 => NativeValue {
|
|
u32_value: cif.call::<u32>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::I32 => NativeValue {
|
|
i32_value: cif.call::<i32>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::U64 => NativeValue {
|
|
u64_value: cif.call::<u64>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::I64 => NativeValue {
|
|
i64_value: cif.call::<i64>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::USize => NativeValue {
|
|
usize_value: cif.call::<usize>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::ISize => NativeValue {
|
|
isize_value: cif.call::<isize>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::F32 => NativeValue {
|
|
f32_value: cif.call::<f32>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::F64 => NativeValue {
|
|
f64_value: cif.call::<f64>(fun_ptr, &call_args),
|
|
},
|
|
NativeType::Pointer | NativeType::Function | NativeType::Buffer => {
|
|
NativeValue {
|
|
pointer: cif.call::<*mut c_void>(fun_ptr, &call_args),
|
|
}
|
|
}
|
|
NativeType::Struct(_) => {
|
|
ffi_call_rtype_struct(cif, &fun_ptr, call_args, out_buffer.unwrap().0)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
#[op(v8)]
|
|
pub fn op_ffi_call_ptr_nonblocking<'scope, FP>(
|
|
scope: &mut v8::HandleScope<'scope>,
|
|
state: Rc<RefCell<deno_core::OpState>>,
|
|
pointer: usize,
|
|
def: ForeignFunction,
|
|
parameters: serde_v8::Value<'scope>,
|
|
out_buffer: Option<serde_v8::Value<'scope>>,
|
|
) -> Result<impl Future<Output = Result<Value, AnyError>>, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
check_unstable2(&state, "Deno.UnsafeFnPointer#call");
|
|
{
|
|
let mut state = state.borrow_mut();
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
};
|
|
|
|
let symbol = PtrSymbol::new(pointer, &def);
|
|
let call_args = ffi_parse_args(scope, parameters, &def.parameters)?;
|
|
let def_result = def.result.clone();
|
|
|
|
let out_buffer = out_buffer
|
|
.map(|v| v8::Local::<v8::TypedArray>::try_from(v.v8_value).unwrap());
|
|
let out_buffer_ptr = out_buffer_as_ptr(scope, out_buffer);
|
|
|
|
let join_handle = tokio::task::spawn_blocking(move || {
|
|
let PtrSymbol { cif, ptr } = symbol.clone();
|
|
ffi_call(
|
|
call_args,
|
|
&cif,
|
|
ptr,
|
|
&def.parameters,
|
|
def.result,
|
|
out_buffer_ptr,
|
|
)
|
|
});
|
|
|
|
Ok(async move {
|
|
let result = join_handle
|
|
.await
|
|
.map_err(|err| anyhow!("Nonblocking FFI call failed: {}", err))??;
|
|
// SAFETY: Same return type declared to libffi; trust user to have it right beyond that.
|
|
Ok(unsafe { result.to_value(def_result) })
|
|
})
|
|
}
|
|
|
|
/// A non-blocking FFI call.
|
|
#[op(v8)]
|
|
pub fn op_ffi_call_nonblocking<'scope>(
|
|
scope: &mut v8::HandleScope<'scope>,
|
|
state: Rc<RefCell<deno_core::OpState>>,
|
|
rid: ResourceId,
|
|
symbol: String,
|
|
parameters: serde_v8::Value<'scope>,
|
|
out_buffer: Option<serde_v8::Value<'scope>>,
|
|
) -> Result<impl Future<Output = Result<Value, AnyError>> + 'static, AnyError> {
|
|
let symbol = {
|
|
let state = state.borrow();
|
|
let resource = state.resource_table.get::<DynamicLibraryResource>(rid)?;
|
|
let symbols = &resource.symbols;
|
|
*symbols
|
|
.get(&symbol)
|
|
.ok_or_else(|| type_error("Invalid FFI symbol name"))?
|
|
.clone()
|
|
};
|
|
|
|
let call_args = ffi_parse_args(scope, parameters, &symbol.parameter_types)?;
|
|
let out_buffer = out_buffer
|
|
.map(|v| v8::Local::<v8::TypedArray>::try_from(v.v8_value).unwrap());
|
|
let out_buffer_ptr = out_buffer_as_ptr(scope, out_buffer);
|
|
|
|
let result_type = symbol.result_type.clone();
|
|
let join_handle = tokio::task::spawn_blocking(move || {
|
|
let Symbol {
|
|
cif,
|
|
ptr,
|
|
parameter_types,
|
|
result_type,
|
|
..
|
|
} = symbol.clone();
|
|
ffi_call(
|
|
call_args,
|
|
&cif,
|
|
ptr,
|
|
¶meter_types,
|
|
result_type,
|
|
out_buffer_ptr,
|
|
)
|
|
});
|
|
|
|
Ok(async move {
|
|
let result = join_handle
|
|
.await
|
|
.map_err(|err| anyhow!("Nonblocking FFI call failed: {}", err))??;
|
|
// SAFETY: Same return type declared to libffi; trust user to have it right beyond that.
|
|
Ok(unsafe { result.to_value(result_type) })
|
|
})
|
|
}
|
|
|
|
#[op(v8)]
|
|
pub fn op_ffi_call_ptr<FP, 'scope>(
|
|
scope: &mut v8::HandleScope<'scope>,
|
|
state: Rc<RefCell<deno_core::OpState>>,
|
|
pointer: usize,
|
|
def: ForeignFunction,
|
|
parameters: serde_v8::Value<'scope>,
|
|
out_buffer: Option<serde_v8::Value<'scope>>,
|
|
) -> Result<serde_v8::Value<'scope>, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
check_unstable2(&state, "Deno.UnsafeFnPointer#call");
|
|
{
|
|
let mut state = state.borrow_mut();
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
};
|
|
|
|
let symbol = PtrSymbol::new(pointer, &def);
|
|
let call_args = ffi_parse_args(scope, parameters, &def.parameters)?;
|
|
|
|
let out_buffer = out_buffer
|
|
.map(|v| v8::Local::<v8::TypedArray>::try_from(v.v8_value).unwrap());
|
|
let out_buffer_ptr = out_buffer_as_ptr(scope, out_buffer);
|
|
|
|
let result = ffi_call(
|
|
call_args,
|
|
&symbol.cif,
|
|
symbol.ptr,
|
|
&def.parameters,
|
|
def.result.clone(),
|
|
out_buffer_ptr,
|
|
)?;
|
|
// SAFETY: Same return type declared to libffi; trust user to have it right beyond that.
|
|
let result = unsafe { result.to_v8(scope, def.result) };
|
|
Ok(result)
|
|
}
|