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490 lines (412 loc) · 11.1 KB
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/* Copyright, 2021 Dominic Letz */
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "erl_nif.h"
#include "tinycc/libtcc.h"
#include "tcclib.h"
static ERL_NIF_TERM error_result(ErlNifEnv *env, const char *error_msg);
static ERL_NIF_TERM ok_result(ErlNifEnv *env, ERL_NIF_TERM ret);
static void free_state(ErlNifEnv *env, void *obj);
static ErlNifResourceType *PROGRAM_TYPE;
typedef struct
{
uint64_t size;
unsigned char *data;
} Binary;
typedef struct
{
char name[64];
int type;
} ParamDef;
typedef union
{
Binary binary;
int64_t integer64;
uint64_t uinteger64;
double doubleval;
} Param;
typedef struct _Item
{
struct _Item *prev;
struct _Item *next;
char begin;
} AllocItem;
typedef struct
{
uint64_t method;
AllocItem *head;
} Env;
void *niffler_alloc(Env *env, size_t size)
{
AllocItem *item = malloc(size + sizeof(AllocItem));
if (!item)
return 0;
memset(item, 0, size + sizeof(AllocItem));
item->next = env->head;
env->head = item;
return &item->begin;
}
void free_env(Env *env)
{
while (env->head)
{
AllocItem *head = env->head;
if (head)
{
env->head = head->next;
free(head);
}
}
}
#define TYPE_INT64 1
#define TYPE_UINT64 2
// #define TYPE_STRING 4
#define TYPE_BINARY 5
#define TYPE_DOUBLE 6
#define MAX_ARGS 10
static int
atom_to_type(char *atom)
{
if (strcmp(atom, "int") == 0)
return TYPE_INT64;
if (strcmp(atom, "int64") == 0)
return TYPE_INT64;
if (strcmp(atom, "uint64") == 0)
return TYPE_UINT64;
// if (strcmp(atom, "char*") == 0) return TYPE_STRING;
if (strcmp(atom, "binary") == 0)
return TYPE_BINARY;
if (strcmp(atom, "double") == 0)
return TYPE_DOUBLE;
return -1;
}
typedef struct
{
int size;
ParamDef *params;
} Params;
typedef struct
{
TCCState *state;
Params inputs;
Params outputs;
} Method;
static void free_methods(Method *methods, unsigned size)
{
if (!methods)
return;
for (unsigned i = 0; i < size; i++)
{
if (methods[i].inputs.params)
free(methods[i].inputs.params);
if (methods[i].outputs.params)
free(methods[i].outputs.params);
}
}
typedef struct
{
TCCState *state;
const char *(*runop)(Env *, Param *, Param *);
Method *methods;
unsigned method_count;
} Program;
static int
load(ErlNifEnv *env, void **priv, ERL_NIF_TERM load_info)
{
int flags = ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER;
PROGRAM_TYPE = enif_open_resource_type(env, "Elixir.Niffler", "state", free_state, flags, NULL);
if (PROGRAM_TYPE == 0)
return -1;
return 0;
}
static int
upgrade(ErlNifEnv *env, void **priv, void **old_priv, ERL_NIF_TERM load_info)
{
return 0;
}
static void
unload(ErlNifEnv *env, void *priv)
{
return;
}
static int
scan_param(ErlNifEnv *env, ERL_NIF_TERM erlp, ParamDef *p, unsigned size, ERL_NIF_TERM *ret)
{
if (!size)
return 1;
ERL_NIF_TERM head, tail;
if (!enif_get_list_cell(env, erlp, &head, &tail))
{
*ret = error_result(env, "Couldn't read nth parameter list item");
return 0;
}
int arity = 0;
const ERL_NIF_TERM *array = 0;
if (!enif_get_tuple(env, head, &arity, &array))
{
*ret = error_result(env, "Parameter list element is not a tuple");
return 0;
}
if (arity != 2)
{
*ret = error_result(env, "Parameter list element is not a 2 element tuple");
return 0;
}
if (!enif_get_atom(env, array[0], p->name, sizeof(p->name), ERL_NIF_LATIN1))
{
ErlNifBinary bin;
if (!enif_inspect_binary(env, array[0], &bin))
{
*ret = error_result(env, "Parameter element {name, type} - name is neither a string nor an atom");
return 0;
}
if (bin.size > sizeof(p->name) - 1)
{
*ret = error_result(env, "Parameter element {name, type} - name is too long (max 63 chars)");
return 0;
}
memcpy(p->name, bin.data, bin.size);
p->name[bin.size] = 0;
}
char atom[32];
if (!enif_get_atom(env, array[1], atom, sizeof(atom) - 1, ERL_NIF_LATIN1))
{
*ret = error_result(env, "Parameter element {name, type} - type is not an atom");
return 0;
}
p->type = atom_to_type(atom);
if (p->type < 0)
{
*ret = error_result(env, "Parameter element {name, type} - type is not a known type");
return 0;
}
return scan_param(env, tail, p + 1, size - 1, ret);
}
static Params
scan_params(ErlNifEnv *env, ERL_NIF_TERM erl_params, ERL_NIF_TERM *ret)
{
Params params = {};
unsigned size;
if (!enif_get_list_length(env, erl_params, &size))
{
*ret = error_result(env, "parameter is not a list");
params.size = -1;
return params;
}
params.size = size;
if (params.size == 0)
return params;
if (params.size > MAX_ARGS)
{
*ret = error_result(env, "parameter list above maximum size");
return params;
}
params.params = malloc(sizeof(params.params[0]) * params.size);
if (!params.params)
{
*ret = error_result(env, "could not allocate parameter list");
return params;
}
memset(params.params, 0, sizeof(params.params[0]) * params.size);
if (!scan_param(env, erl_params, params.params, params.size, ret))
{
free(params.params);
params.size = -1;
return params;
}
return params;
}
static ERL_NIF_TERM
compile(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifBinary sourcecode;
TCCState *state;
if (!enif_inspect_binary(env, argv[0], &sourcecode))
return enif_make_badarg(env);
unsigned size;
ERL_NIF_TERM method_list = argv[1];
if (!enif_get_list_length(env, method_list, &size))
return error_result(env, "parameter is not a list");
if (size == 0)
return error_result(env, "parameter list is empty");
Method *methods = malloc(sizeof(Method) * size);
if (!methods)
return error_result(env, "could not allocate method list");
memset(methods, 0, sizeof(Method) * size);
for (unsigned i = 0; i < size; i++)
{
ERL_NIF_TERM head;
if (!enif_get_list_cell(env, method_list, &head, &method_list))
return error_result(env, "could get method list element");
int arity;
const ERL_NIF_TERM* tuple;
if (!enif_get_tuple(env, head, &arity, &tuple) || arity != 2)
return error_result(env, "method list element is not a 2-element tuple");
ERL_NIF_TERM ret = error_result(env, "failed to scan input parameters");
methods[i].inputs = scan_params(env, tuple[0], &ret);
if (methods[i].inputs.size < 0)
{
free_methods(methods, size);
return ret;
}
ret = error_result(env, "failed to scan output parameters");
methods[i].outputs = scan_params(env, tuple[1], &ret);
if (methods[i].outputs.size < 0)
{
free_methods(methods, size);
return ret;
}
}
state = tcc_new();
if (!state)
{
free_methods(methods, size);
return error_result(env, "could not initiate tcc state");
}
Program *program = enif_alloc_resource(PROGRAM_TYPE, sizeof(Program));
program->state = state;
program->methods = methods;
program->method_count = size;
ERL_NIF_TERM term = enif_make_resource(env, program);
enif_release_resource(program);
if (tcc_set_output_type(state, TCC_OUTPUT_MEMORY) != 0)
return error_result(env, "could not set tcc output type");
if (tcc_compile_string(state, (const char *)sourcecode.data) != 0)
return error_result(env, "compilation error");
#define X(name) tcc_add_symbol(state, #name, name);
#include "symbols.def"
#undef X
tcc_set_options(state, "-nostdlib");
if (tcc_relocate(state, TCC_RELOCATE_AUTO) != 0)
return error_result(env, "could not relocate program");
program->runop = tcc_get_symbol(program->state, "run");
if (!program->runop)
return error_result(env, " run is undefined");
return ok_result(env, term);
}
static void free_state(ErlNifEnv *env, void *obj)
{
Program *program = (Program *)obj;
tcc_delete(program->state);
free_methods(program->methods, program->method_count);
}
static ERL_NIF_TERM
run(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
Program *program;
if (!enif_get_resource(env, argv[0], PROGRAM_TYPE, (void *)&program))
return enif_make_badarg(env);
uint64_t method_index;
if (!enif_get_uint64(env, argv[1], &method_index))
return error_result(env, "method index must be an int");
if (method_index >= program->method_count)
return error_result(env, "method index out of bounds");
Method *method = &program->methods[method_index];
Param *input = alloca(sizeof(Param) * method->inputs.size);
Param *output = alloca(sizeof(Param) * method->outputs.size);
memset(output, 0, sizeof(Param) * method->outputs.size);
// Param input[MAX_ARGS] = {};
// Param output[MAX_ARGS] = {};
ERL_NIF_TERM head, tail = argv[2];
for (int i = 0; i < method->inputs.size; i++)
{
if (!enif_get_list_cell(env, tail, &head, &tail))
return error_result(env, "not enough arguments");
switch (method->inputs.params[i].type)
{
case TYPE_INT64:
if (!enif_get_int64(env, head, &input[i].integer64))
return error_result(env, "parameter should be int64");
break;
case TYPE_UINT64:
if (!enif_get_uint64(env, head, &input[i].uinteger64))
return error_result(env, "parameter should be uint64");
break;
case TYPE_DOUBLE:
if (!enif_get_double(env, head, &input[i].doubleval))
return error_result(env, "parameter should be double");
break;
// case TYPE_STRING:
case TYPE_BINARY:
{
ErlNifBinary erlbin;
if (!enif_inspect_binary(env, head, &erlbin))
return error_result(env, "parameter should be binary");
input[i].binary.size = erlbin.size;
input[i].binary.data = erlbin.data;
break;
}
default:
return error_result(env, "internal type error");
}
}
Env user_env;
user_env.method = method_index;
user_env.head = 0;
const char *error = program->runop(&user_env, input, output);
if (error)
{
free_env(&user_env);
return error_result(env, error);
}
ERL_NIF_TERM ret = enif_make_list(env, 0);
for (int i = 0; i < method->outputs.size; i++)
{
ERL_NIF_TERM cell;
Param *param = output + i;
switch (method->outputs.params[i].type)
{
case TYPE_INT64:
cell = enif_make_int64(env, param->integer64);
break;
case TYPE_UINT64:
cell = enif_make_uint64(env, param->uinteger64);
break;
case TYPE_DOUBLE:
cell = enif_make_double(env, param->doubleval);
break;
// case TYPE_STRING:
case TYPE_BINARY:
{
if (param->binary.data == 0)
{
free_env(&user_env);
return error_result(env, "no result binary provided");
}
if (param->binary.size == 0) {
param->binary.size = strlen(param->binary.data);
}
unsigned char *bin = enif_make_new_binary(env, param->binary.size, &cell);
if (!bin)
{
free_env(&user_env);
return error_result(env, "could not allocate result binary");
}
memcpy(bin, param->binary.data, param->binary.size);
break;
}
default:
free_env(&user_env);
return error_result(env, "internal type error");
}
ret = enif_make_list_cell(env, cell, ret);
}
free_env(&user_env);
return ok_result(env, ret);
}
static ERL_NIF_TERM error_result(ErlNifEnv *env, const char *error_msg)
{
ERL_NIF_TERM bin;
unsigned char *dst = enif_make_new_binary(env, strlen(error_msg), &bin);
memcpy(dst, error_msg, strlen(error_msg));
return enif_make_tuple2(env, enif_make_atom(env, "error"), bin);
}
static ERL_NIF_TERM ok_result(ErlNifEnv *env, ERL_NIF_TERM ret)
{
return enif_make_tuple2(env, enif_make_atom(env, "ok"), ret);
}
static ErlNifFunc nif_funcs[] = {
{"nif_compile", 2, compile},
{"nif_run", 3, run}};
ERL_NIF_INIT(Elixir.Niffler, nif_funcs, &load, NULL, &upgrade, &unload);