wasmer/lib/emscripten/src/lib.rs

#[macro_use]
extern crate wasmer_runtime_core;

use lazy_static::lazy_static;
use std::cell::UnsafeCell;
use std::{f64, ffi::c_void};
use wasmer_runtime_core::{
    error::CallResult,
    export::Export,
    func,
    global::Global,
    import::ImportObject,
    imports,
    memory::Memory,
    module::ImportName,
    table::Table,
    types::{ElementType, FuncSig, MemoryDescriptor, TableDescriptor, Type, Value},
    units::Pages,
    vm::Ctx,
    Func, Instance, IsExport, Module,
};

#[macro_use]
mod macros;
//#[cfg(test)]
mod file_descriptor;
pub mod stdio;

// EMSCRIPTEN APIS
mod bitwise;
mod emscripten_target;
mod env;
mod errno;
mod exception;
mod exec;
mod exit;
mod io;
mod jmp;
mod linking;
mod lock;
mod math;
mod memory;
mod process;
mod signal;
mod storage;
mod syscalls;
mod time;
mod utils;
mod varargs;

pub use self::storage::{align_memory, static_alloc};
pub use self::utils::{
    allocate_cstr_on_stack, allocate_on_stack, get_emscripten_memory_size,
    get_emscripten_table_size, is_emscripten_module,
};

// TODO: Magic number - how is this calculated?
const TOTAL_STACK: u32 = 5_242_880;
// TODO: make this variable
const STATIC_BUMP: u32 = 215_536;

lazy_static! {
    static ref OLD_ABORT_ON_CANNOT_GROW_MEMORY_SIG: FuncSig =
        { FuncSig::new(vec![], vec![Type::I32]) };
}

// The address globals begin at. Very low in memory, for code size and optimization opportunities.
// Above 0 is static memory, starting with globals.
// Then the stack.
// Then 'dynamic' memory for sbrk.
const GLOBAL_BASE: u32 = 1024;
const STATIC_BASE: u32 = GLOBAL_BASE;

pub struct EmscriptenData<'a> {
    pub malloc: Func<'a, u32, u32>,
    pub free: Func<'a, u32>,
    pub memalign: Option<Func<'a, (u32, u32), u32>>,
    pub memset: Func<'a, (u32, u32, u32), u32>,
    pub stack_alloc: Func<'a, u32, u32>,
    pub jumps: Vec<UnsafeCell<[u32; 27]>>,

    pub dyn_call_i: Option<Func<'a, i32, i32>>,
    pub dyn_call_ii: Option<Func<'a, (i32, i32), i32>>,
    pub dyn_call_iii: Option<Func<'a, (i32, i32, i32), i32>>,
    pub dyn_call_iiii: Option<Func<'a, (i32, i32, i32, i32), i32>>,
    pub dyn_call_v: Option<Func<'a, (i32)>>,
    pub dyn_call_vi: Option<Func<'a, (i32, i32)>>,
    pub dyn_call_vii: Option<Func<'a, (i32, i32, i32)>>,
    pub dyn_call_viii: Option<Func<'a, (i32, i32, i32, i32)>>,
    pub dyn_call_viiii: Option<Func<'a, (i32, i32, i32, i32, i32)>>,

    // round 2
    pub dyn_call_dii: Option<Func<'a, (i32, i32, i32), f64>>,
    pub dyn_call_diiii: Option<Func<'a, (i32, i32, i32, i32, i32), f64>>,
    pub dyn_call_iiiii: Option<Func<'a, (i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_iiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_iiiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_iiiiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_iiiiiiiiii:
        Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_vd: Option<Func<'a, (i32, f64)>>,
    pub dyn_call_viiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiiiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiiiiiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_iiji: Option<Func<'a, (i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_j: Option<Func<'a, i32, i32>>,
    pub dyn_call_ji: Option<Func<'a, (i32, i32), i32>>,
    pub dyn_call_jij: Option<Func<'a, (i32, i32, i32, i32), i32>>,
    pub dyn_call_jjj: Option<Func<'a, (i32, i32, i32, i32, i32), i32>>,
    pub dyn_call_viiij: Option<Func<'a, (i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiijiiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiijiiiiii:
        Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viij: Option<Func<'a, (i32, i32, i32, i32, i32)>>,
    pub dyn_call_viiji: Option<Func<'a, (i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viijiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viijj: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_vij: Option<Func<'a, (i32, i32, i32, i32)>>,
    pub dyn_call_viji: Option<Func<'a, (i32, i32, i32, i32, i32)>>,
    pub dyn_call_vijiii: Option<Func<'a, (i32, i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_vijj: Option<Func<'a, (i32, i32, i32, i32, i32, i32)>>,
    pub dyn_call_viidii: Option<Func<'a, (i32, i32, i32, f64, i32, i32)>>,
}

impl<'a> EmscriptenData<'a> {
    pub fn new(instance: &'a mut Instance) -> EmscriptenData<'a> {
        let malloc = instance.func("_malloc").unwrap();
        let free = instance.func("_free").unwrap();
        let memalign = if let Ok(func) = instance.func("_memalign") {
            Some(func)
        } else {
            None
        };
        let memset = instance.func("_memset").unwrap();
        let stack_alloc = instance.func("stackAlloc").unwrap();

        let dyn_call_i = instance.func("dynCall_i").ok();
        let dyn_call_ii = instance.func("dynCall_ii").ok();
        let dyn_call_iii = instance.func("dynCall_iii").ok();
        let dyn_call_iiii = instance.func("dynCall_iiii").ok();
        let dyn_call_v = instance.func("dynCall_v").ok();
        let dyn_call_vi = instance.func("dynCall_vi").ok();
        let dyn_call_vii = instance.func("dynCall_vii").ok();
        let dyn_call_viii = instance.func("dynCall_viii").ok();
        let dyn_call_viiii = instance.func("dynCall_viiii").ok();

        // round 2
        let dyn_call_dii = instance.func("dynCall_dii").ok();
        let dyn_call_diiii = instance.func("dynCall_diiii").ok();
        let dyn_call_iiiii = instance.func("dynCall_iiiii").ok();
        let dyn_call_iiiiii = instance.func("dynCall_iiiiii").ok();
        let dyn_call_iiiiiii = instance.func("dynCall_iiiiiii").ok();
        let dyn_call_iiiiiiii = instance.func("dynCall_iiiiiiii").ok();
        let dyn_call_iiiiiiiiii = instance.func("dynCall_iiiiiiiiii").ok();
        let dyn_call_vd = instance.func("dynCall_vd").ok();
        let dyn_call_viiiii = instance.func("dynCall_viiiii").ok();
        let dyn_call_viiiiii = instance.func("dynCall_viiiiii").ok();
        let dyn_call_viiiiiii = instance.func("dynCall_viiiiiii").ok();
        let dyn_call_viiiiiiii = instance.func("dynCall_viiiiiiii").ok();
        let dyn_call_viiiiiiiii = instance.func("dynCall_viiiiiiiii").ok();
        let dyn_call_iiji = instance.func("dynCall_iiji").ok();
        let dyn_call_j = instance.func("dynCall_j").ok();
        let dyn_call_ji = instance.func("dynCall_ji").ok();
        let dyn_call_jij = instance.func("dynCall_jij").ok();
        let dyn_call_jjj = instance.func("dynCall_jjj").ok();
        let dyn_call_viiij = instance.func("dynCall_viiij").ok();
        let dyn_call_viiijiiii = instance.func("dynCall_viiijiiii").ok();
        let dyn_call_viiijiiiiii = instance.func("dynCall_viiijiiiiii").ok();
        let dyn_call_viij = instance.func("dynCall_viij").ok();
        let dyn_call_viiji = instance.func("dynCall_viiji").ok();
        let dyn_call_viijiii = instance.func("dynCall_viijiii").ok();
        let dyn_call_viijj = instance.func("dynCall_viijj").ok();
        let dyn_call_vij = instance.func("dynCall_vij").ok();
        let dyn_call_viji = instance.func("dynCall_viji").ok();
        let dyn_call_vijiii = instance.func("dynCall_vijiii").ok();
        let dyn_call_vijj = instance.func("dynCall_vijj").ok();
        let dyn_call_viidii = instance.func("dynCall_viidii").ok();

        EmscriptenData {
            malloc,
            free,
            memalign,
            memset,
            stack_alloc,
            jumps: Vec::new(),
            dyn_call_i,
            dyn_call_ii,
            dyn_call_iii,
            dyn_call_iiii,
            dyn_call_v,
            dyn_call_vi,
            dyn_call_vii,
            dyn_call_viii,
            dyn_call_viiii,

            // round 2
            dyn_call_dii,
            dyn_call_diiii,
            dyn_call_iiiii,
            dyn_call_iiiiii,
            dyn_call_iiiiiii,
            dyn_call_iiiiiiii,
            dyn_call_iiiiiiiiii,
            dyn_call_vd,
            dyn_call_viiiii,
            dyn_call_viiiiii,
            dyn_call_viiiiiii,
            dyn_call_viiiiiiii,
            dyn_call_viiiiiiiii,
            dyn_call_iiji,
            dyn_call_j,
            dyn_call_ji,
            dyn_call_jij,
            dyn_call_jjj,
            dyn_call_viiij,
            dyn_call_viiijiiii,
            dyn_call_viiijiiiiii,
            dyn_call_viij,
            dyn_call_viiji,
            dyn_call_viijiii,
            dyn_call_viijj,
            dyn_call_vij,
            dyn_call_viji,
            dyn_call_vijiii,
            dyn_call_vijj,
            dyn_call_viidii,
        }
    }
}

pub fn run_emscripten_instance(
    _module: &Module,
    instance: &mut Instance,
    path: &str,
    args: Vec<&str>,
) -> CallResult<()> {
    let mut data = EmscriptenData::new(instance);
    let data_ptr = &mut data as *mut _ as *mut c_void;
    instance.context_mut().data = data_ptr;

    if let Ok(_func) = instance.dyn_func("___emscripten_environ_constructor") {
        instance.call("___emscripten_environ_constructor", &[])?;
    }

    // println!("running emscripten instance");

    let main_func = instance.dyn_func("_main")?;
    let num_params = main_func.signature().params().len();
    let _result = match num_params {
        2 => {
            let (argc, argv) = store_module_arguments(instance.context_mut(), path, args);
            instance.call("_main", &[Value::I32(argc as i32), Value::I32(argv as i32)])?;
        }
        0 => {
            instance.call("_main", &[])?;
        }
        _ => panic!(
            "The emscripten main function has received an incorrect number of params {}",
            num_params
        ),
    };

    // TODO atinit and atexit for emscripten
    // println!("{:?}", data);
    Ok(())
}

fn store_module_arguments(ctx: &mut Ctx, path: &str, args: Vec<&str>) -> (u32, u32) {
    let argc = args.len() + 1;

    let mut args_slice = vec![0; argc];
    args_slice[0] = unsafe { allocate_cstr_on_stack(ctx, path).0 };
    for (slot, arg) in args_slice[1..argc].iter_mut().zip(args.iter()) {
        *slot = unsafe { allocate_cstr_on_stack(ctx, &arg).0 };
    }

    let (argv_offset, argv_slice): (_, &mut [u32]) =
        unsafe { allocate_on_stack(ctx, ((argc + 1) * 4) as u32) };
    assert!(!argv_slice.is_empty());
    for (slot, arg) in argv_slice[0..argc].iter_mut().zip(args_slice.iter()) {
        *slot = *arg
    }
    argv_slice[argc] = 0;

    (argc as u32, argv_offset)
}

pub fn emscripten_set_up_memory(memory: &Memory, globals: &EmscriptenGlobalsData) {
    let dynamictop_ptr = globals.dynamictop_ptr;
    let stack_max = globals.stack_max;

    let dynamic_base = align_memory(stack_max);

    memory.view::<u32>()[(dynamictop_ptr / 4) as usize].set(dynamic_base);
}

pub struct EmscriptenGlobalsData {
    abort: u64,
    // Env namespace
    stacktop: u32,
    stack_max: u32,
    dynamictop_ptr: u32,
    memory_base: u32,
    table_base: u32,
    temp_double_ptr: u32,
    use_old_abort_on_cannot_grow_memory: bool,
}

pub struct EmscriptenGlobals {
    // The emscripten data
    pub data: EmscriptenGlobalsData,
    // The emscripten memory
    pub memory: Memory,
    pub table: Table,
    pub memory_min: Pages,
    pub memory_max: Option<Pages>,
    pub null_func_names: Vec<String>,
}

impl EmscriptenGlobals {
    pub fn new(module: &Module /*, static_bump: u32 */) -> Self {
        let mut use_old_abort_on_cannot_grow_memory = false;
        for (
            index,
            ImportName {
                namespace_index,
                name_index,
            },
        ) in &module.info().imported_functions
        {
            let namespace = module.info().namespace_table.get(*namespace_index);
            let name = module.info().name_table.get(*name_index);
            if name == "abortOnCannotGrowMemory" && namespace == "env" {
                let sig_index = module.info().func_assoc[index.convert_up(module.info())];
                let expected_sig = &module.info().signatures[sig_index];
                if *expected_sig == *OLD_ABORT_ON_CANNOT_GROW_MEMORY_SIG {
                    use_old_abort_on_cannot_grow_memory = true;
                }
                break;
            }
        }

        let (table_min, table_max) = get_emscripten_table_size(&module);
        let (memory_min, memory_max) = get_emscripten_memory_size(&module);

        // Memory initialization
        let memory_type = MemoryDescriptor {
            minimum: memory_min,
            maximum: memory_max,
            shared: false,
        };
        let memory = Memory::new(memory_type).unwrap();

        let table_type = TableDescriptor {
            element: ElementType::Anyfunc,
            minimum: table_min,
            maximum: table_max,
        };
        let table = Table::new(table_type).unwrap();

        let data = {
            let static_bump = STATIC_BUMP;

            let mut static_top = STATIC_BASE + static_bump;

            let memory_base = STATIC_BASE;
            let table_base = 0;

            let temp_double_ptr = static_top;
            static_top += 16;

            let dynamictop_ptr = static_alloc(&mut static_top, 4);

            let stacktop = align_memory(static_top);
            let stack_max = stacktop + TOTAL_STACK;

            EmscriptenGlobalsData {
                abort: 0,
                stacktop,
                stack_max,
                dynamictop_ptr,
                memory_base,
                table_base,
                temp_double_ptr,
                use_old_abort_on_cannot_grow_memory,
            }
        };

        emscripten_set_up_memory(&memory, &data);

        let mut null_func_names = vec![];
        for (
            _,
            ImportName {
                namespace_index,
                name_index,
            },
        ) in &module.info().imported_functions
        {
            let namespace = module.info().namespace_table.get(*namespace_index);
            let name = module.info().name_table.get(*name_index);
            if namespace == "env" && name.starts_with("nullFunc_") {
                null_func_names.push(name.to_string())
            }
        }

        Self {
            data,
            memory,
            table,
            memory_min,
            memory_max,
            null_func_names,
        }
    }
}

pub fn generate_emscripten_env(globals: &mut EmscriptenGlobals) -> ImportObject {
    let abort_on_cannot_grow_memory_export = if globals.data.use_old_abort_on_cannot_grow_memory {
        func!(crate::memory::abort_on_cannot_grow_memory_old).to_export()
    } else {
        func!(crate::memory::abort_on_cannot_grow_memory).to_export()
    };

    let mut env_ns = namespace! {
        "memory" => Export::Memory(globals.memory.clone()),
        "table" => Export::Table(globals.table.clone()),

        // Globals
        "STACKTOP" => Global::new(Value::I32(globals.data.stacktop as i32)),
        "STACK_MAX" => Global::new(Value::I32(globals.data.stack_max as i32)),
        "DYNAMICTOP_PTR" => Global::new(Value::I32(globals.data.dynamictop_ptr as i32)),
        "tableBase" => Global::new(Value::I32(globals.data.table_base as i32)),
        "__table_base" => Global::new(Value::I32(globals.data.table_base as i32)),
        "ABORT" => Global::new(Value::I32(globals.data.abort as i32)),
        "memoryBase" => Global::new(Value::I32(globals.data.memory_base as i32)),
        "__memory_base" => Global::new(Value::I32(globals.data.memory_base as i32)),
        "tempDoublePtr" => Global::new(Value::I32(globals.data.temp_double_ptr as i32)),

        // IO
        "printf" => func!(crate::io::printf),
        "putchar" => func!(crate::io::putchar),
        "___lock" => func!(crate::lock::___lock),
        "___unlock" => func!(crate::lock::___unlock),
        "___wait" => func!(crate::lock::___wait),
        "_flock" => func!(crate::lock::_flock),
        "_chroot" => func!(crate::io::chroot),
        "_getprotobyname" => func!(crate::io::getprotobyname),
        "_getprotobynumber" => func!(crate::io::getprotobynumber),
        "_getpwuid" => func!(crate::io::getpwuid),
        "_sigdelset" => func!(crate::io::sigdelset),
        "_sigfillset" => func!(crate::io::sigfillset),
        "_tzset" => func!(crate::io::tzset),
        "_strptime" => func!(crate::io::strptime),

        // exec
        "_execvp" => func!(crate::exec::execvp),
        "_execl" => func!(crate::exec::execl),
        "_execle" => func!(crate::exec::execle),

        // exit
        "__exit" => func!(crate::exit::exit),

        // Env
        "___assert_fail" => func!(crate::env::___assert_fail),
        "_getenv" => func!(crate::env::_getenv),
        "_setenv" => func!(crate::env::_setenv),
        "_putenv" => func!(crate::env::_putenv),
        "_unsetenv" => func!(crate::env::_unsetenv),
        "_getpwnam" => func!(crate::env::_getpwnam),
        "_getgrnam" => func!(crate::env::_getgrnam),
        "___buildEnvironment" => func!(crate::env::___build_environment),
        "___setErrNo" => func!(crate::errno::___seterrno),
        "_getpagesize" => func!(crate::env::_getpagesize),
        "_sysconf" => func!(crate::env::_sysconf),
        "_getaddrinfo" => func!(crate::env::_getaddrinfo),

        // Syscalls
        "___syscall1" => func!(crate::syscalls::___syscall1),
        "___syscall3" => func!(crate::syscalls::___syscall3),
        "___syscall4" => func!(crate::syscalls::___syscall4),
        "___syscall5" => func!(crate::syscalls::___syscall5),
        "___syscall6" => func!(crate::syscalls::___syscall6),
        "___syscall9" => func!(crate::syscalls::___syscall9),
        "___syscall10" => func!(crate::syscalls::___syscall10),
        "___syscall12" => func!(crate::syscalls::___syscall12),
        "___syscall15" => func!(crate::syscalls::___syscall15),
        "___syscall20" => func!(crate::syscalls::___syscall20),
        "___syscall33" => func!(crate::syscalls::___syscall33),
        "___syscall34" => func!(crate::syscalls::___syscall34),
        "___syscall39" => func!(crate::syscalls::___syscall39),
        "___syscall38" => func!(crate::syscalls::___syscall38),
        "___syscall40" => func!(crate::syscalls::___syscall40),
        "___syscall41" => func!(crate::syscalls::___syscall41),
        "___syscall42" => func!(crate::syscalls::___syscall42),
        "___syscall54" => func!(crate::syscalls::___syscall54),
        "___syscall57" => func!(crate::syscalls::___syscall57),
        "___syscall60" => func!(crate::syscalls::___syscall60),
        "___syscall63" => func!(crate::syscalls::___syscall63),
        "___syscall64" => func!(crate::syscalls::___syscall64),
        "___syscall66" => func!(crate::syscalls::___syscall66),
        "___syscall75" => func!(crate::syscalls::___syscall75),
        "___syscall77" => func!(crate::syscalls::___syscall77),
        "___syscall83" => func!(crate::syscalls::___syscall83),
        "___syscall85" => func!(crate::syscalls::___syscall85),
        "___syscall91" => func!(crate::syscalls::___syscall191),
        "___syscall94" => func!(crate::syscalls::___syscall194),
        "___syscall97" => func!(crate::syscalls::___syscall97),
        "___syscall102" => func!(crate::syscalls::___syscall102),
        "___syscall110" => func!(crate::syscalls::___syscall110),
        "___syscall114" => func!(crate::syscalls::___syscall114),
        "___syscall118" => func!(crate::syscalls::___syscall118),
        "___syscall122" => func!(crate::syscalls::___syscall122),
        "___syscall140" => func!(crate::syscalls::___syscall140),
        "___syscall142" => func!(crate::syscalls::___syscall142),
        "___syscall145" => func!(crate::syscalls::___syscall145),
        "___syscall146" => func!(crate::syscalls::___syscall146),
        "___syscall148" => func!(crate::syscalls::___syscall148),
        "___syscall168" => func!(crate::syscalls::___syscall168),
        "___syscall180" => func!(crate::syscalls::___syscall180),
        "___syscall181" => func!(crate::syscalls::___syscall181),
        "___syscall183" => func!(crate::syscalls::___syscall183),
        "___syscall191" => func!(crate::syscalls::___syscall191),
        "___syscall192" => func!(crate::syscalls::___syscall192),
        "___syscall194" => func!(crate::syscalls::___syscall194),
        "___syscall195" => func!(crate::syscalls::___syscall195),
        "___syscall196" => func!(crate::syscalls::___syscall196),
        "___syscall197" => func!(crate::syscalls::___syscall197),
        "___syscall198" => func!(crate::syscalls::___syscall198),
        "___syscall199" => func!(crate::syscalls::___syscall199),
        "___syscall200" => func!(crate::syscalls::___syscall200),
        "___syscall201" => func!(crate::syscalls::___syscall201),
        "___syscall202" => func!(crate::syscalls::___syscall202),
        "___syscall205" => func!(crate::syscalls::___syscall205),
        "___syscall207" => func!(crate::syscalls::___syscall207),
        "___syscall212" => func!(crate::syscalls::___syscall212),
        "___syscall219" => func!(crate::syscalls::___syscall219),
        "___syscall220" => func!(crate::syscalls::___syscall220),
        "___syscall221" => func!(crate::syscalls::___syscall221),
        "___syscall268" => func!(crate::syscalls::___syscall268),
        "___syscall272" => func!(crate::syscalls::___syscall272),
        "___syscall295" => func!(crate::syscalls::___syscall295),
        "___syscall300" => func!(crate::syscalls::___syscall300),
        "___syscall324" => func!(crate::syscalls::___syscall324),
        "___syscall330" => func!(crate::syscalls::___syscall330),
        "___syscall334" => func!(crate::syscalls::___syscall334),
        "___syscall340" => func!(crate::syscalls::___syscall340),

        // Process
        "abort" => func!(crate::process::em_abort),
        "_abort" => func!(crate::process::_abort),
        "abortStackOverflow" => func!(crate::process::abort_stack_overflow),
        "_llvm_trap" => func!(crate::process::_llvm_trap),
        "_fork" => func!(crate::process::_fork),
        "_exit" => func!(crate::process::_exit),
        "_system" => func!(crate::process::_system),
        "_popen" => func!(crate::process::_popen),
        "_endgrent" => func!(crate::process::_endgrent),
        "_execve" => func!(crate::process::_execve),
        "_kill" => func!(crate::process::_kill),
        "_llvm_stackrestore" => func!(crate::process::_llvm_stackrestore),
        "_llvm_stacksave" => func!(crate::process::_llvm_stacksave),
        "_raise" => func!(crate::process::_raise),
        "_sem_init" => func!(crate::process::_sem_init),
        "_sem_post" => func!(crate::process::_sem_post),
        "_sem_wait" => func!(crate::process::_sem_wait),
        "_getgrent" => func!(crate::process::_getgrent),
        "_sched_yield" => func!(crate::process::_sched_yield),
        "_setgrent" => func!(crate::process::_setgrent),
        "_setgroups" => func!(crate::process::_setgroups),
        "_setitimer" => func!(crate::process::_setitimer),
        "_usleep" => func!(crate::process::_usleep),
        "_nanosleep" => func!(crate::process::_nanosleep),
        "_utimes" => func!(crate::process::_utimes),
        "_waitpid" => func!(crate::process::_waitpid),


        // Signal
        "_sigemptyset" => func!(crate::signal::_sigemptyset),
        "_sigaddset" => func!(crate::signal::_sigaddset),
        "_sigprocmask" => func!(crate::signal::_sigprocmask),
        "_sigaction" => func!(crate::signal::_sigaction),
        "_signal" => func!(crate::signal::_signal),
        "_sigsuspend" => func!(crate::signal::_sigsuspend),

        // Memory
        "abortOnCannotGrowMemory" => abort_on_cannot_grow_memory_export,
        "_emscripten_memcpy_big" => func!(crate::memory::_emscripten_memcpy_big),
        "_emscripten_get_heap_size" => func!(crate::memory::_emscripten_get_heap_size),
        "_emscripten_resize_heap" => func!(crate::memory::_emscripten_resize_heap),
        "enlargeMemory" => func!(crate::memory::enlarge_memory),
        "getTotalMemory" => func!(crate::memory::get_total_memory),
        "___map_file" => func!(crate::memory::___map_file),

        // Exception
        "___cxa_allocate_exception" => func!(crate::exception::___cxa_allocate_exception),
        "___cxa_throw" => func!(crate::exception::___cxa_throw),

        // Time
        "_gettimeofday" => func!(crate::time::_gettimeofday),
        "_clock_gettime" => func!(crate::time::_clock_gettime),
        "___clock_gettime" => func!(crate::time::_clock_gettime),
        "_clock" => func!(crate::time::_clock),
        "_difftime" => func!(crate::time::_difftime),
        "_asctime" => func!(crate::time::_asctime),
        "_asctime_r" => func!(crate::time::_asctime_r),
        "_localtime" => func!(crate::time::_localtime),
        "_time" => func!(crate::time::_time),
        "_strftime" => func!(crate::time::_strftime),
        "_localtime_r" => func!(crate::time::_localtime_r),
        "_gmtime_r" => func!(crate::time::_gmtime_r),
        "_mktime" => func!(crate::time::_mktime),
        "_gmtime" => func!(crate::time::_gmtime),

        // Math
        "f64-rem" => func!(crate::math::f64_rem),
        "_llvm_log10_f64" => func!(crate::math::_llvm_log10_f64),
        "_llvm_log2_f64" => func!(crate::math::_llvm_log2_f64),
        "_llvm_log10_f32" => func!(crate::math::_llvm_log10_f32),
        "_llvm_log2_f32" => func!(crate::math::_llvm_log2_f64),
        "_llvm_sin_f64" => func!(crate::math::_llvm_sin_f64),
        "_llvm_cos_f64" => func!(crate::math::_llvm_cos_f64),
        "_emscripten_random" => func!(crate::math::_emscripten_random),

        // Jump
        "__setjmp" => func!(crate::jmp::__setjmp),
        "__longjmp" => func!(crate::jmp::__longjmp),
        "_longjmp" => func!(crate::jmp::__longjmp),

        // Bitwise
        "_llvm_bswap_i64" => func!(crate::bitwise::_llvm_bswap_i64),

        // Linking
        "_dlclose" => func!(crate::linking::_dlclose),
        "_dlerror" => func!(crate::linking::_dlerror),
        "_dlopen" => func!(crate::linking::_dlopen),
        "_dlsym" => func!(crate::linking::_dlsym),

        // wasm32-unknown-emscripten
        "setTempRet0" => func!(crate::emscripten_target::setTempRet0),
        "getTempRet0" => func!(crate::emscripten_target::getTempRet0),
        "invoke_i" => func!(crate::emscripten_target::invoke_i),
        "invoke_ii" => func!(crate::emscripten_target::invoke_ii),
        "invoke_iii" => func!(crate::emscripten_target::invoke_iii),
        "invoke_iiii" => func!(crate::emscripten_target::invoke_iiii),
        "invoke_v" => func!(crate::emscripten_target::invoke_v),
        "invoke_vi" => func!(crate::emscripten_target::invoke_vi),
        "invoke_vii" => func!(crate::emscripten_target::invoke_vii),
        "invoke_viii" => func!(crate::emscripten_target::invoke_viii),
        "invoke_viiii" => func!(crate::emscripten_target::invoke_viiii),
        "__Unwind_Backtrace" => func!(crate::emscripten_target::__Unwind_Backtrace),
        "__Unwind_FindEnclosingFunction" => func!(crate::emscripten_target::__Unwind_FindEnclosingFunction),
        "__Unwind_GetIPInfo" => func!(crate::emscripten_target::__Unwind_GetIPInfo),
        "___cxa_find_matching_catch_2" => func!(crate::emscripten_target::___cxa_find_matching_catch_2),
        "___cxa_find_matching_catch_3" => func!(crate::emscripten_target::___cxa_find_matching_catch_3),
        "___cxa_free_exception" => func!(crate::emscripten_target::___cxa_free_exception),
        "___resumeException" => func!(crate::emscripten_target::___resumeException),
        "_dladdr" => func!(crate::emscripten_target::_dladdr),
        "_pthread_create" => func!(crate::emscripten_target::_pthread_create),
        "_pthread_join" => func!(crate::emscripten_target::_pthread_join),
        "_pthread_cond_destroy" => func!(crate::emscripten_target::_pthread_cond_destroy),
        "_pthread_cond_init" => func!(crate::emscripten_target::_pthread_cond_init),
        "_pthread_cond_signal" => func!(crate::emscripten_target::_pthread_cond_signal),
        "_pthread_cond_wait" => func!(crate::emscripten_target::_pthread_cond_wait),
        "_pthread_condattr_destroy" => func!(crate::emscripten_target::_pthread_condattr_destroy),
        "_pthread_condattr_init" => func!(crate::emscripten_target::_pthread_condattr_init),
        "_pthread_condattr_setclock" => func!(crate::emscripten_target::_pthread_condattr_setclock),
        "_pthread_mutex_destroy" => func!(crate::emscripten_target::_pthread_mutex_destroy),
        "_pthread_mutex_init" => func!(crate::emscripten_target::_pthread_mutex_init),
        "_pthread_mutexattr_destroy" => func!(crate::emscripten_target::_pthread_mutexattr_destroy),
        "_pthread_mutexattr_init" => func!(crate::emscripten_target::_pthread_mutexattr_init),
        "_pthread_mutexattr_settype" => func!(crate::emscripten_target::_pthread_mutexattr_settype),
        "_pthread_rwlock_rdlock" => func!(crate::emscripten_target::_pthread_rwlock_rdlock),
        "_pthread_rwlock_unlock" => func!(crate::emscripten_target::_pthread_rwlock_unlock),
        "_pthread_setcancelstate" => func!(crate::emscripten_target::_pthread_setcancelstate),
        "___gxx_personality_v0" => func!(crate::emscripten_target::___gxx_personality_v0),
        "_getdtablesize" => func!(crate::emscripten_target::_getdtablesize),
        "_gethostbyaddr" => func!(crate::emscripten_target::_gethostbyaddr),
        "_gethostbyname_r" => func!(crate::emscripten_target::_gethostbyname_r),
        "_getloadavg" => func!(crate::emscripten_target::_getloadavg),
        "invoke_dii" => func!(crate::emscripten_target::invoke_dii),
        "invoke_diiii" => func!(crate::emscripten_target::invoke_diiii),
        "invoke_iiiii" => func!(crate::emscripten_target::invoke_iiiii),
        "invoke_iiiiii" => func!(crate::emscripten_target::invoke_iiiiii),
        "invoke_iiiiiii" => func!(crate::emscripten_target::invoke_iiiiiii),
        "invoke_iiiiiiii" => func!(crate::emscripten_target::invoke_iiiiiiii),
        "invoke_iiiiiiiiii" => func!(crate::emscripten_target::invoke_iiiiiiiiii),
        "invoke_vd" => func!(crate::emscripten_target::invoke_vd),
        "invoke_viiiii" => func!(crate::emscripten_target::invoke_viiiii),
        "invoke_viiiiii" => func!(crate::emscripten_target::invoke_viiiiii),
        "invoke_viiiiiii" => func!(crate::emscripten_target::invoke_viiiiiii),
        "invoke_viiiiiiii" => func!(crate::emscripten_target::invoke_viiiiiiii),
        "invoke_viiiiiiiii" => func!(crate::emscripten_target::invoke_viiiiiiiii),
        "invoke_iiji" => func!(crate::emscripten_target::invoke_iiji),
        "invoke_j" => func!(crate::emscripten_target::invoke_j),
        "invoke_ji" => func!(crate::emscripten_target::invoke_ji),
        "invoke_jij" => func!(crate::emscripten_target::invoke_jij),
        "invoke_jjj" => func!(crate::emscripten_target::invoke_jjj),
        "invoke_viiij" => func!(crate::emscripten_target::invoke_viiij),
        "invoke_viiijiiii" => func!(crate::emscripten_target::invoke_viiijiiii),
        "invoke_viiijiiiiii" => func!(crate::emscripten_target::invoke_viiijiiiiii),
        "invoke_viij" => func!(crate::emscripten_target::invoke_viij),
        "invoke_viiji" => func!(crate::emscripten_target::invoke_viiji),
        "invoke_viijiii" => func!(crate::emscripten_target::invoke_viijiii),
        "invoke_viijj" => func!(crate::emscripten_target::invoke_viijj),
        "invoke_vij" => func!(crate::emscripten_target::invoke_vij),
        "invoke_viji" => func!(crate::emscripten_target::invoke_viji),
        "invoke_vijiii" => func!(crate::emscripten_target::invoke_vijiii),
        "invoke_vijj" => func!(crate::emscripten_target::invoke_vijj),
        "invoke_viidii" => func!(crate::emscripten_target::invoke_viidii),
    };

    for null_func_name in globals.null_func_names.iter() {
        env_ns.insert(null_func_name.as_str(), Func::new(nullfunc).to_export());
    }

    let import_object: ImportObject = imports! {
        "env" => env_ns,
        "global" => {
          "NaN" => Global::new(Value::F64(f64::NAN)),
          "Infinity" => Global::new(Value::F64(f64::INFINITY)),
        },
        "global.Math" => {
            "pow" => func!(crate::math::pow),
            "exp" => func!(crate::math::exp),
            "log" => func!(crate::math::log),
        },
        "asm2wasm" => {
            "f64-rem" => func!(crate::math::f64_rem),
        },
    };

    import_object
}

pub fn nullfunc(ctx: &mut Ctx, _x: u32) {
    use crate::process::abort_with_message;
    debug!("emscripten::nullfunc_i {}", _x);
    abort_with_message(ctx, "Invalid function pointer called with signature 'i'. Perhaps this is an invalid value (e.g. caused by calling a virtual method on a NULL pointer)? Or calling a function with an incorrect type, which will fail? (it is worth building your source files with -Werror (warnings are errors), as warnings can indicate undefined behavior which can cause this)");
}

/// The current version of this crate
pub const VERSION: &str = env!("CARGO_PKG_VERSION");