wrt/main.c

#include <stdio.h>
#include <stdlib.h>

#include "utils/log.h"
#include "wrt/dl.h"
#include "wrt/wrt.h"

uint8_t *read_file(const char *filename, uint32_t *fsize) {
    FILE *f = fopen(filename, "rb");
    if (f == NULL) {
        LOG_ERR("read_file: fopen failed");
        return NULL;
    }

    fseek(f, 0, SEEK_END);
    *fsize = ftell(f);
    fseek(f, 0, SEEK_SET); // same as rewind(f);

    uint8_t *buffer = malloc(*fsize + 1);
    fread(buffer, *fsize, 1, f);
    fclose(f);

    buffer[*fsize] = 0;

    return buffer;
}

void test_wrt() {
    uint32_t buf_size;
    uint8_t *buf = read_file("example.wasm", &buf_size);

    WRTContext context;
    wrt_platform_init(&context, malloc, free);
    wrt_mem_init(&context, 512 * 1024, 128);
    wrt_program_init(&context, buf, buf_size, NULL, 0);
    wrt_wamr_init(&context, "entry", 8092, 8092);
    wrt_run(&context);
    wrt_free(&context);

    free(buf);
}

unsigned char foo(unsigned int x, float y, char z, double w) {
    printf("foo: x=%u, y=%f, z=%c, w=%lf\n", x, y, z, w);
    return 'P';
}

void test_ffi() {
    ffi_cif    cif;
    ffi_type  *arg_types[4];
    void      *arg_values[4];
    ffi_status status;

    // Because the return value from foo() is smaller than sizeof(long), it
    // must be passed as ffi_arg or ffi_sarg.
    ffi_arg result;

    // Specify the data type of each argument. Available types are defined
    // in <ffi/ffi.h>.
    arg_types[0] = &ffi_type_uint;
    arg_types[1] = &ffi_type_float;
    arg_types[2] = &ffi_type_schar;
    arg_types[3] = &ffi_type_double;

    // Prepare the ffi_cif structure.
    if ((status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 4, &ffi_type_uint8, arg_types)) != FFI_OK) {
        // Handle the ffi_status error.
        LOG_ERR("ffi_prep_cif failed: %d", status);
    }

    // Specify the values of each argument.
    unsigned int arg1 = 42;
    float        arg2 = 5.1f;
    char         arg3 = 'A';
    double       arg4 = 114.1514;

    arg_values[0] = &arg1;
    arg_values[1] = &arg2;
    arg_values[2] = &arg3;
    arg_values[3] = &arg4;

    // Invoke the function.
    ffi_call(&cif, FFI_FN(foo), &result, arg_values);

    // The ffi_arg 'result' now contains the unsigned char returned from foo(),
    // which can be accessed by a typecast.
    printf("result is %c\n", (unsigned char)result);
}

int main() {
    LOG_INFO("WRT Test");

    test_ffi();
    test_wrt();

    return 0;
}