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janet/src/core/ffi.c

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/*
* Copyright (c) 2022 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include "util.h"
#endif
#ifdef JANET_FFI
static uint64_t test_function(int32_t a, int32_t b, const char *s) {
printf("a = %d\n", a);
printf("b = %d\n", b);
uint64_t ret = a + b;
printf("string: %s\n", s);
printf("hello from test function. Returning %lu.\n", ret);
return ret;
}
JANET_CORE_FN(cfun_ffi_get_test_pointer,
"(ffi/get-test-pointer)",
"Get a test pointer to call using ffi.") {
janet_fixarity(argc, 0);
(void) argv;
return janet_wrap_pointer(test_function);
}
typedef enum {
JANET_FFI_TYPE_VOID,
JANET_FFI_TYPE_SHORT,
JANET_FFI_TYPE_INT,
JANET_FFI_TYPE_LONG,
JANET_FFI_TYPE_USHORT,
JANET_FFI_TYPE_UINT,
JANET_FFI_TYPE_ULONG,
JANET_FFI_TYPE_BOOL,
JANET_FFI_TYPE_PTR,
JANET_FFI_TYPE_FLOAT,
JANET_FFI_TYPE_DOUBLE,
JANET_FFI_TYPE_INT8,
JANET_FFI_TYPE_UINT8,
JANET_FFI_TYPE_INT16,
JANET_FFI_TYPE_UINT16,
JANET_FFI_TYPE_INT32,
JANET_FFI_TYPE_UINT32,
JANET_FFI_TYPE_INT64,
JANET_FFI_TYPE_UINT64,
} JanetFFIPrimType;
static const size_t janet_ffi_type_sizes[] = {
0, /* JANET_FFI_TYPE_VOID */
sizeof(short), /* JANET_FFI_TYPE_SHORT */
sizeof(int), /* JANET_FFI_TYPE_INT */
sizeof(long), /* JANET_FFI_TYPE_LONG */
sizeof(unsigned short), /* JANET_FFI_TYPE_USHORT */
sizeof(unsigned), /* JANET_FFI_TYPE_UINT */
sizeof(unsigned long), /* JANET_FFI_TYPE_ULONG */
sizeof(char), /* JANET_FFI_TYPE_BOOL */
sizeof(void *), /* JANET_FFI_TYPE_PTR */
sizeof(float), /* JANET_FFI_TYPE_FLOAT */
sizeof(double), /* JANET_FFI_TYPE_DOUBLE */
sizeof(int8_t), /* JANET_FFI_TYPE_INT8 */
sizeof(uint8_t), /* JANET_FFI_TYPE_UINT8 */
sizeof(int16_t), /* JANET_FFI_TYPE_INT16 */
sizeof(uint16_t), /* JANET_FFI_TYPE_UINT16 */
sizeof(int32_t), /* JANET_FFI_TYPE_INT32 */
sizeof(uint32_t), /* JANET_FFI_TYPE_UINT32 */
sizeof(int64_t), /* JANET_FFI_TYPE_INT64 */
sizeof(uint64_t) /* JANET_FFI_TYPE_UINT64 */
};
typedef enum {
JANET_FFI_CC_SYSV_64
} JanetFFICallingConvention;
#define JANET_FFI_MAX_REGS 16
#define JANET_FFI_MAX_STACK 32
typedef struct {
uint32_t frame_size;
uint32_t reg_count;
uint32_t stack_count;
uint32_t arg_count;
JanetFFICallingConvention cc;
JanetFFIPrimType ret_type;
JanetFFIPrimType regs[JANET_FFI_MAX_REGS];
JanetFFIPrimType stack[JANET_FFI_MAX_STACK];
} JanetFFISignature;
static const JanetAbstractType janet_signature_type = {
"core/ffi-signature",
JANET_ATEND_NAME
};
static JanetFFICallingConvention decode_ffi_cc(const uint8_t *name) {
/* TODO */
(void) name;
return JANET_FFI_CC_SYSV_64;
}
static JanetFFIPrimType decode_ffi_prim(const uint8_t *name) {
if (!janet_cstrcmp(name, "void")) return JANET_FFI_TYPE_VOID;
if (!janet_cstrcmp(name, "short")) return JANET_FFI_TYPE_SHORT;
if (!janet_cstrcmp(name, "int")) return JANET_FFI_TYPE_INT;
if (!janet_cstrcmp(name, "long")) return JANET_FFI_TYPE_LONG;
if (!janet_cstrcmp(name, "ushort")) return JANET_FFI_TYPE_USHORT;
if (!janet_cstrcmp(name, "uint")) return JANET_FFI_TYPE_UINT;
if (!janet_cstrcmp(name, "ulong")) return JANET_FFI_TYPE_ULONG;
if (!janet_cstrcmp(name, "bool")) return JANET_FFI_TYPE_BOOL;
if (!janet_cstrcmp(name, "ptr")) return JANET_FFI_TYPE_PTR;
if (!janet_cstrcmp(name, "float")) return JANET_FFI_TYPE_FLOAT;
if (!janet_cstrcmp(name, "double")) return JANET_FFI_TYPE_DOUBLE;
if (!janet_cstrcmp(name, "int8")) return JANET_FFI_TYPE_INT8;
if (!janet_cstrcmp(name, "uint8")) return JANET_FFI_TYPE_UINT8;
if (!janet_cstrcmp(name, "int16")) return JANET_FFI_TYPE_INT16;
if (!janet_cstrcmp(name, "uint16")) return JANET_FFI_TYPE_UINT16;
if (!janet_cstrcmp(name, "int32")) return JANET_FFI_TYPE_INT32;
if (!janet_cstrcmp(name, "uint32")) return JANET_FFI_TYPE_UINT32;
if (!janet_cstrcmp(name, "int64")) return JANET_FFI_TYPE_INT64;
if (!janet_cstrcmp(name, "uint64")) return JANET_FFI_TYPE_UINT64;
janet_panicf("unknown machine type %s", name);
}
JANET_CORE_FN(cfun_ffi_signature,
"(ffi/signature calling-convention ret-type & arg-types)",
"Create a function signature object that can be used to make calls "
"with raw function pointers.") {
janet_arity(argc, 2, -1);
uint32_t frame_size = 0;
uint32_t reg_count = 0;
uint32_t stack_count = 0;
JanetFFICallingConvention cc = decode_ffi_cc(janet_getkeyword(argv, 0));
JanetFFIPrimType ret_type = decode_ffi_prim(janet_getkeyword(argv, 1));
uint32_t max_regs = JANET_FFI_MAX_REGS;
JanetFFIPrimType regs[JANET_FFI_MAX_REGS];
JanetFFIPrimType stack[JANET_FFI_MAX_STACK];
for (int i = 0; i < JANET_FFI_MAX_REGS; i++) regs[i] = JANET_FFI_TYPE_VOID;
for (int i = 0; i < JANET_FFI_MAX_STACK; i++) stack[i] = JANET_FFI_TYPE_VOID;
switch (cc) {
default:
break;
case JANET_FFI_CC_SYSV_64:
max_regs = 6;
break;
}
for (int32_t i = 2; i < argc; i++) {
JanetFFIPrimType ptype = decode_ffi_prim(janet_getkeyword(argv, i));
if (reg_count < max_regs) {
regs[reg_count++] = ptype;
} else {
stack[stack_count++] = ptype;
frame_size += janet_ffi_type_sizes[ptype];
}
}
JanetFFISignature *abst = janet_abstract(&janet_signature_type, sizeof(JanetFFISignature));
abst->frame_size = frame_size;
abst->reg_count = reg_count;
abst->stack_count = stack_count;
abst->cc = cc;
abst->ret_type = ret_type;
abst->arg_count = stack_count + reg_count;
memcpy(abst->regs, regs, sizeof(JanetFFIPrimType) * JANET_FFI_MAX_REGS);
memcpy(abst->stack, stack, sizeof(JanetFFIPrimType) * JANET_FFI_MAX_STACK);
return janet_wrap_abstract(abst);
}
static void *janet_ffi_getpointer(const Janet *argv, int32_t n) {
switch(janet_type(argv[n])) {
default:
janet_panicf("bad slot #%d, expected pointer convertable type, got %v", argv[n]);
case JANET_POINTER:
case JANET_STRING:
case JANET_KEYWORD:
case JANET_SYMBOL:
return janet_unwrap_pointer(argv[n]);
case JANET_BUFFER:
return janet_unwrap_buffer(argv[n])->data;
}
}
JANET_CORE_FN(cfun_ffi_call,
"(ffi/call pointer signature & args)",
"Call a raw pointer as a function pointer. The function signature specifies "
"how Janet values in `args` are converted to native machine types.") {
janet_arity(argc, 2, -1);
void *function_pointer = janet_getpointer(argv, 0);
JanetFFISignature *signature = janet_getabstract(argv, 1, &janet_signature_type);
janet_fixarity(argc - 2, signature->arg_count);
uint64_t regs[6];
for (uint32_t i = 0; i < signature->reg_count; i++) {
switch (signature->regs[i]) {
case JANET_FFI_TYPE_FLOAT:
case JANET_FFI_TYPE_DOUBLE:
janet_panic("nyi");
break;
case JANET_FFI_TYPE_VOID:
regs[i] = 0;
continue;
case JANET_FFI_TYPE_PTR:
regs[i] = (uint64_t) janet_ffi_getpointer(argv, i + 2);
break;
case JANET_FFI_TYPE_BOOL:
regs[i] = (uint64_t) janet_getboolean(argv, i + 2);
break;
case JANET_FFI_TYPE_SHORT:
case JANET_FFI_TYPE_INT:
case JANET_FFI_TYPE_INT8:
case JANET_FFI_TYPE_INT16:
case JANET_FFI_TYPE_INT32:
case JANET_FFI_TYPE_INT64:
case JANET_FFI_TYPE_LONG:
regs[i] = (uint64_t) janet_getinteger64(argv, i + 2);
break;
case JANET_FFI_TYPE_USHORT:
case JANET_FFI_TYPE_UINT:
case JANET_FFI_TYPE_UINT8:
case JANET_FFI_TYPE_UINT16:
case JANET_FFI_TYPE_UINT32:
case JANET_FFI_TYPE_UINT64:
case JANET_FFI_TYPE_ULONG:
regs[i] = janet_getuinteger64(argv, i + 2);
break;
}
}
/* Danger zone */
uint64_t ret, rethi;
__asm__("mov %3, %%rdi\n\t"
"mov %4, %%rsi\n\t"
"mov %5, %%rdx\n\t"
"mov %6, %%rcx\n\t"
"mov %7, %%r8\n\t"
"mov %8, %%r9\n\t"
"call *%2\n\t"
"mov %%rax, %0\n\t"
"mov %%rdx, %1"
: "=g" (ret), "=g" (rethi)
: "g"(function_pointer),
"g"(regs[0]),
"g"(regs[1]),
"g"(regs[2]),
"g"(regs[3]),
"g"(regs[4]),
"g"(regs[5])
: "rax", "rdi", "rsi", "rdx", "rcx", "r8", "r9", "r10", "r11");
(void) rethi; /* at some point we will support more complex return types */
switch (signature->ret_type) {
case JANET_FFI_TYPE_FLOAT:
case JANET_FFI_TYPE_DOUBLE:
janet_panic("nyi");
break;
case JANET_FFI_TYPE_VOID:
break;
case JANET_FFI_TYPE_PTR:
return janet_wrap_pointer((void *) ret);
case JANET_FFI_TYPE_BOOL:
return janet_wrap_boolean(ret);
case JANET_FFI_TYPE_SHORT:
case JANET_FFI_TYPE_INT:
case JANET_FFI_TYPE_INT8:
case JANET_FFI_TYPE_INT16:
case JANET_FFI_TYPE_INT32:
return janet_wrap_integer((int32_t) ret);
case JANET_FFI_TYPE_INT64:
case JANET_FFI_TYPE_LONG:
return janet_wrap_integer((int64_t) ret);
case JANET_FFI_TYPE_USHORT:
case JANET_FFI_TYPE_UINT:
case JANET_FFI_TYPE_UINT8:
case JANET_FFI_TYPE_UINT16:
case JANET_FFI_TYPE_UINT32:
case JANET_FFI_TYPE_UINT64:
case JANET_FFI_TYPE_ULONG:
return janet_wrap_number(ret);
}
return janet_wrap_nil();
}
void janet_lib_ffi(JanetTable *env) {
JanetRegExt ffi_cfuns[] = {
JANET_CORE_REG("ffi/get-test-pointer", cfun_ffi_get_test_pointer),
JANET_CORE_REG("ffi/signature", cfun_ffi_signature),
JANET_CORE_REG("ffi/call", cfun_ffi_call),
JANET_REG_END
};
janet_core_cfuns_ext(env, NULL, ffi_cfuns);
}
#endif
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