//
//  m3_api_libc.c
//
//  Created by Volodymyr Shymanskyy on 11/20/19.
//  Copyright © 2019 Volodymyr Shymanskyy. All rights reserved.
//

#define _POSIX_C_SOURCE 200809L

#include "m3_api_libc.h"

#include "m3_api_defs.h"
#include "m3_env.h"
#include "m3_exception.h"

#include <time.h>
#include <errno.h>
#include <stdio.h>


m3ApiRawFunction(m3_libc_abort)
{
    m3ApiTrap(m3Err_trapAbort);
}

m3ApiRawFunction(m3_libc_exit)
{
    m3ApiGetArg     (int32_t, code)

    m3ApiTrap(m3Err_trapExit);
}


m3ApiRawFunction(m3_libc_memset)
{
    m3ApiReturnType (int32_t)

    m3ApiGetArgMem  (void*,   i_ptr)
    m3ApiGetArg     (int32_t, i_value)
    m3ApiGetArg     (int32_t, i_size)

    u32 result = m3ApiPtrToOffset(memset (i_ptr, i_value, i_size));
    m3ApiReturn(result);
}


m3ApiRawFunction(m3_libc_memmove)
{
    m3ApiReturnType (int32_t)

    m3ApiGetArgMem  (void*,   o_dst)
    m3ApiGetArgMem  (void*,   i_src)
    m3ApiGetArg     (int32_t, i_size)

    u32 result = m3ApiPtrToOffset(memmove (o_dst, i_src, i_size));
    m3ApiReturn(result);
}

m3ApiRawFunction(m3_libc_clock)
{
    m3ApiReturnType (uint32_t)

    m3ApiReturn(clock());
}

static
M3Result  SuppressLookupFailure (M3Result i_result)
{
    if (i_result == m3Err_functionLookupFailed)
        return m3Err_none;
    else
        return i_result;
}

m3ApiRawFunction(m3_spectest_dummy)
{
    m3ApiSuccess();
}

m3ApiRawFunction(m3_wasm3_raw_sum)
{
    m3ApiReturnType  (int64_t)
    m3ApiGetArg      (int32_t, val1)
    m3ApiGetArg      (int32_t, val2)
    m3ApiGetArg      (int32_t, val3)
    m3ApiGetArg      (int32_t, val4)

    m3ApiReturn(val1 + val2 + val3 + val4);

    m3ApiSuccess();
}

/* TODO: implement direct native function calls (using libffi?)
i64 m3_wasm3_native_sum(i32 val1, i32 val2, i32 val3, i32 val4)
{
    return val1 + val2 + val3 + val4;
}
*/


M3Result  m3_LinkSpecTest  (IM3Module module)
{
    M3Result result = m3Err_none;

    const char* spectest = "spectest";
    const char* wasm3    = "wasm3";

_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print",         "v()",      &m3_spectest_dummy)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print_i32",     "v(i)",     &m3_spectest_dummy)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print_i64",     "v(I)",     &m3_spectest_dummy)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print_f32",     "v(f)",     &m3_spectest_dummy)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print_f64",     "v(F)",     &m3_spectest_dummy)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print_i32_f32", "v(if)",    &m3_spectest_dummy)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, spectest, "print_i64_f64", "v(IF)",    &m3_spectest_dummy)));


_   (SuppressLookupFailure (m3_LinkRawFunction (module, wasm3, "raw_sum",          "I(iiii)",  &m3_wasm3_raw_sum)));
//_   (SuppressLookupFailure (m3_LinkCFunction   (module, wasm3, "native_sum",    "I(iiii)",  &m3_wasm3_native_sum)));

_catch:
    return result;
}


M3Result  m3_LinkLibC  (IM3Module module)
{
    M3Result result = m3Err_none;

    const char* env = "env";

_   (SuppressLookupFailure (m3_LinkRawFunction (module, env, "_memset",           "*(*ii)",  &m3_libc_memset)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, env, "_memmove",          "*(**i)",  &m3_libc_memmove)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, env, "_memcpy",           "*(**i)",  &m3_libc_memmove))); // just alias of memmove
_   (SuppressLookupFailure (m3_LinkRawFunction (module, env, "_abort",            "v()",     &m3_libc_abort)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, env, "_exit",             "v(i)",    &m3_libc_exit)));
_   (SuppressLookupFailure (m3_LinkRawFunction (module, env, "_clock",            "i()",     &m3_libc_clock)));

_catch:
    return result;
}