mirror of
https://github.com/denoland/deno.git
synced 2024-12-23 07:44:48 -05:00
253 lines
7.8 KiB
Rust
253 lines
7.8 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use crate::NativeType;
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use crate::{tcc::Compiler, Symbol};
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use std::ffi::c_void;
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use std::ffi::CString;
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use std::fmt::Write as _;
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use std::mem::size_of;
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const _: () = assert!(size_of::<fn()>() == size_of::<usize>());
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pub(crate) struct Allocation {
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pub addr: *mut c_void,
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_ctx: Compiler,
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_sym: Box<Symbol>,
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}
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macro_rules! cstr {
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($st:expr) => {
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&CString::new($st).unwrap()
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};
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}
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fn native_arg_to_c(ty: &NativeType) -> &'static str {
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match ty {
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NativeType::U8 | NativeType::U16 | NativeType::U32 => "uint32_t",
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NativeType::I8 | NativeType::I16 | NativeType::I32 => "int32_t",
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NativeType::Void => "void",
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NativeType::F32 => "float",
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NativeType::F64 => "double",
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NativeType::U64 => "uint64_t",
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NativeType::I64 => "int64_t",
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NativeType::ISize => "intptr_t",
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NativeType::USize => "uintptr_t",
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NativeType::Pointer => "struct FastApiTypedArray*",
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NativeType::Function => "void*",
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}
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}
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fn native_to_c(ty: &NativeType) -> &'static str {
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match ty {
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NativeType::U8 => "uint8_t",
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NativeType::U16 => "uint16_t",
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NativeType::U32 => "uint32_t",
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NativeType::I8 => "int8_t",
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NativeType::I16 => "uint16_t",
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NativeType::I32 => "int32_t",
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NativeType::Void => "void",
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NativeType::F32 => "float",
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NativeType::F64 => "double",
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NativeType::U64 => "uint64_t",
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NativeType::I64 => "int64_t",
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NativeType::ISize => "intptr_t",
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NativeType::USize => "uintptr_t",
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NativeType::Pointer | NativeType::Function => "void*",
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}
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}
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pub(crate) fn codegen(sym: &crate::Symbol) -> String {
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let mut c = String::from(include_str!("prelude.h"));
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let needs_unwrap = crate::needs_unwrap(sym.result_type);
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// Return type of the FFI call.
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let ffi_ret = native_to_c(&sym.result_type);
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// Return type of the trampoline.
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let ret = if needs_unwrap { "void" } else { ffi_ret };
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// extern <return_type> func(
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let _ = write!(c, "\nextern {ffi_ret} func(");
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// <param_type> p0, <param_type> p1, ...);
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for (i, ty) in sym.parameter_types.iter().enumerate() {
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if i > 0 {
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c += ", ";
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}
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c += native_to_c(ty);
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let _ = write!(c, " p{i}");
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}
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c += ");\n\n";
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// void* recv, <param_type> p0, <param_type> p1, ...);
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c += ret;
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c += " func_trampoline(";
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c += "void* recv";
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for (i, ty) in sym.parameter_types.iter().enumerate() {
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c += ", ";
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c += native_arg_to_c(ty);
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let _ = write!(c, " p{i}");
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}
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if needs_unwrap {
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let _ = write!(c, ", struct FastApiTypedArray* const p_ret");
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}
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c += ") {\n";
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// func(p0, p1, ...);
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let mut call_s = String::from("func(");
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{
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for (i, ty) in sym.parameter_types.iter().enumerate() {
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if i > 0 {
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call_s += ", ";
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}
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if matches!(ty, NativeType::Pointer) {
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let _ = write!(call_s, "p{i}->data");
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} else {
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let _ = write!(call_s, "p{i}");
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}
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}
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call_s += ");\n";
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}
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if needs_unwrap {
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// <return_type> r = func(p0, p1, ...);
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// ((<return_type>*)p_ret->data)[0] = r;
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let _ = write!(c, " {ffi_ret} r = {call_s}");
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let _ = writeln!(c, " (({ffi_ret}*)p_ret->data)[0] = r;");
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} else {
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// return func(p0, p1, ...);
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let _ = write!(c, " return {call_s}");
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}
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c += "}\n\n";
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c
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}
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pub(crate) fn gen_trampoline(
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sym: Box<crate::Symbol>,
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) -> Result<Box<Allocation>, ()> {
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let mut ctx = Compiler::new()?;
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ctx.set_options(cstr!("-nostdlib"));
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// SAFETY: symbol satisfies ABI requirement.
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unsafe { ctx.add_symbol(cstr!("func"), sym.ptr.0 as *const c_void) };
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let c = codegen(&sym);
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ctx.compile_string(cstr!(c))?;
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let alloc = Allocation {
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addr: ctx.relocate_and_get_symbol(cstr!("func_trampoline"))?,
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_ctx: ctx,
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_sym: sym,
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};
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Ok(Box::new(alloc))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use libffi::middle::Type;
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use std::ptr::null_mut;
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fn codegen(parameters: Vec<NativeType>, ret: NativeType) -> String {
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let sym = Box::new(crate::Symbol {
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cif: libffi::middle::Cif::new(vec![], Type::void()),
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ptr: libffi::middle::CodePtr(null_mut()),
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parameter_types: parameters,
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result_type: ret,
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can_callback: false,
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});
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super::codegen(&sym)
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}
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const PRELUDE: &str = include_str!("prelude.h");
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fn assert_codegen(expected: String, actual: &str) {
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assert_eq!(expected, format!("{PRELUDE}\n{}", actual))
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}
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#[test]
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fn test_gen_trampoline() {
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assert_codegen(
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codegen(vec![], NativeType::Void),
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"extern void func();\n\n\
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void func_trampoline(void* recv) {\
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\n return func();\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::U32, NativeType::U32], NativeType::U32),
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"extern uint32_t func(uint32_t p0, uint32_t p1);\n\n\
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uint32_t func_trampoline(void* recv, uint32_t p0, uint32_t p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::I32, NativeType::I32], NativeType::I32),
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"extern int32_t func(int32_t p0, int32_t p1);\n\n\
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int32_t func_trampoline(void* recv, int32_t p0, int32_t p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::F32, NativeType::F32], NativeType::F32),
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"extern float func(float p0, float p1);\n\n\
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float func_trampoline(void* recv, float p0, float p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::F64, NativeType::F64], NativeType::F64),
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"extern double func(double p0, double p1);\n\n\
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double func_trampoline(void* recv, double p0, double p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::Pointer, NativeType::U32], NativeType::U32),
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"extern uint32_t func(void* p0, uint32_t p1);\n\n\
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uint32_t func_trampoline(void* recv, struct FastApiTypedArray* p0, uint32_t p1) {\
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\n return func(p0->data, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::Pointer, NativeType::Pointer], NativeType::U32),
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"extern uint32_t func(void* p0, void* p1);\n\n\
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uint32_t func_trampoline(void* recv, struct FastApiTypedArray* p0, struct FastApiTypedArray* p1) {\
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\n return func(p0->data, p1->data);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![], NativeType::U64),
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"extern uint64_t func();\n\n\
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void func_trampoline(void* recv, struct FastApiTypedArray* const p_ret) {\
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\n uint64_t r = func();\
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\n ((uint64_t*)p_ret->data)[0] = r;\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::Pointer, NativeType::Pointer], NativeType::U64),
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"extern uint64_t func(void* p0, void* p1);\n\n\
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void func_trampoline(void* recv, struct FastApiTypedArray* p0, struct FastApiTypedArray* p1, struct FastApiTypedArray* const p_ret) {\
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\n uint64_t r = func(p0->data, p1->data);\
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\n ((uint64_t*)p_ret->data)[0] = r;\n\
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}\n\n",
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);
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}
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#[test]
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fn test_gen_trampoline_implicit_cast() {
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assert_codegen(
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codegen(vec![NativeType::I8, NativeType::U8], NativeType::I8),
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"extern int8_t func(int8_t p0, uint8_t p1);\n\n\
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int8_t func_trampoline(void* recv, int32_t p0, uint32_t p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::ISize, NativeType::U64], NativeType::Void),
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"extern void func(intptr_t p0, uint64_t p1);\n\n\
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void func_trampoline(void* recv, intptr_t p0, uint64_t p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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assert_codegen(
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codegen(vec![NativeType::USize, NativeType::USize], NativeType::U32),
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"extern uint32_t func(uintptr_t p0, uintptr_t p1);\n\n\
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uint32_t func_trampoline(void* recv, uintptr_t p0, uintptr_t p1) {\
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\n return func(p0, p1);\n\
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}\n\n",
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);
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}
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}
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