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Code Issues 1 Releases Wiki Activity

Beginning of struct support.

Browse Source 
TODO:
- struct return values
- support for unions in signatures
- more testing
- complex types
- packed structs
- writing structs to buffers (useful and we have most of the machinery).
This commit is contained in:
Calvin Rose
2022-06-09 20:27:56 -05:00
parent 6f90df26a5
commit f1ec8d1e11
4 changed files with 421 additions and 166 deletions
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21
ffitest/so.c
View File

@@ -35,3 +35,24 @@ double double_lots(
double float_fn(float x, float y, float z) {
return (x + y) * z;
}
typedef struct {
int a;
int b;
} intint;
typedef struct {
int a;
int b;
int c;
} intintint;
int intint_fn(double x, intint ii) {
printf("double: %g\n", x);
return ii.a + ii.b;
}
int intintint_fn(double x, intintint iii) {
printf("double: %g\n", x);
return iii.a + iii.b + iii.c;
}

22
ffitest/test.janet
View File

@@ -36,10 +36,32 @@
[x y z]
(native-call float-fn-pointer float-fn-sig x y z))
(def intint-fn-sig (native-signature :default :int :double [:int :int]))
(def intint-fn-pointer (native-lookup module "intint_fn"))
(defn intint-fn
[x ii]
(native-call intint-fn-pointer intint-fn-sig x ii))
(def intintint (native-struct :int :int :int))
(def intintint-fn-sig (native-signature :default :int :double intintint))
(def intintint-fn-pointer (native-lookup module "intintint_fn"))
(defn intintint-fn
[x iii]
(native-call intintint-fn-pointer intintint-fn-sig x iii))
#
# Call functions
#
(pp (int-fn 10 20))
(pp (double-fn 1.5 2.5 3.5))
(pp (double-many 1 2 3 4 5 6))
(pp (double-lots 1 2 3 4 5 6 7 8 9 10))
(pp (float-fn 8 4 17))
(pp (intint-fn 123.456 [10 20]))
(pp (intintint-fn 123.456 [10 20 30]))
(assert (= 60 (int-fn 10 20)))
(assert (= 42 (double-fn 1.5 2.5 3.5)))
(assert (= 21 (double-many 1 2 3 4 5 6)))

543
src/core/ffi.c
View File

@@ -32,14 +32,11 @@
#define alloca _alloca
#endif
typedef struct JanetFFIType JanetFFIType;
typedef struct JanetFFIStruct JanetFFIStruct;
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,
@@ -52,6 +49,7 @@ typedef enum {
JANET_FFI_TYPE_UINT32,
JANET_FFI_TYPE_INT64,
JANET_FFI_TYPE_UINT64,
JANET_FFI_TYPE_STRUCT
} JanetFFIPrimType;
/* Custom alignof since alignof not in c99 standard */
@@ -64,12 +62,6 @@ typedef struct {
static const JanetFFIPrimInfo janet_ffi_type_info[] = {
{0, 0}, /* JANET_FFI_TYPE_VOID */
{sizeof(short), ALIGNOF(short)},/* JANET_FFI_TYPE_SHORT */
{sizeof(int), ALIGNOF(int)}, /* JANET_FFI_TYPE_INT */
{sizeof(long), ALIGNOF(long)}, /* JANET_FFI_TYPE_LONG */
{sizeof(unsigned short), ALIGNOF(unsigned short)}, /* JANET_FFI_TYPE_USHORT */
{sizeof(unsigned), ALIGNOF(unsigned)}, /* JANET_FFI_TYPE_UINT */
{sizeof(unsigned long), ALIGNOF(unsigned long)}, /* JANET_FFI_TYPE_ULONG */
{sizeof(char), ALIGNOF(char)}, /* JANET_FFI_TYPE_BOOL */
{sizeof(void *), ALIGNOF(void *)}, /* JANET_FFI_TYPE_PTR */
{sizeof(float), ALIGNOF(float)}, /* JANET_FFI_TYPE_FLOAT */
@@ -82,47 +74,121 @@ static const JanetFFIPrimInfo janet_ffi_type_info[] = {
{sizeof(uint32_t), ALIGNOF(uint32_t)}, /* JANET_FFI_TYPE_UINT32 */
{sizeof(int64_t), ALIGNOF(int64_t)}, /* JANET_FFI_TYPE_INT64 */
{sizeof(uint64_t), ALIGNOF(uint64_t)}, /* JANET_FFI_TYPE_UINT64 */
{0, ALIGNOF(uint64_t)} /* JANET_FFI_TYPE_STRUCT */
};
typedef struct {
struct JanetFFIType {
JanetFFIStruct *st;
JanetFFIPrimType prim;
};
struct JanetFFIStruct {
uint32_t size;
uint32_t align;
uint32_t field_count;
JanetFFIPrimType fields[];
} JanetFFIStruct;
JanetFFIType fields[];
};
/* Specifies how the registers are classified. This is used
* to determine if a certain argument should be passed in a register,
* on the stack, special floating pointer register, etc. */
typedef enum {
JANET_SYSV64_INTEGER,
JANET_SYSV64_SSE,
JANET_SYSV64_SSEUP,
JANET_SYSV64_X87,
JANET_SYSV64_X87UP,
JANET_SYSV64_COMPLEX_X87,
JANET_SYSV64_NO_CLASS,
JANET_SYSV64_MEMORY
} JanetFFIWordSpec;
/* Describe how each Janet argument is interpreted in terms of machine words
* that will be mapped to registers/stack. */
typedef struct {
JanetFFIPrimType prim;
int32_t argn;
JanetFFIType type;
JanetFFIWordSpec spec;
uint32_t offset; /* point to the exact register / stack offset depending on spec. */
} JanetFFIMapping;
typedef enum {
JANET_FFI_CC_SYSV_64
} JanetFFICallingConvention;
#define JANET_FFI_MAX_REGS 16
#define JANET_FFI_MAX_FP_REGS 8
#define JANET_FFI_MAX_STACK 32
#define JANET_FFI_MAX_ARGS 32
typedef struct {
uint32_t frame_size;
uint32_t reg_count;
uint32_t fp_reg_count;
uint32_t stack_count;
uint32_t arg_count;
uint32_t word_count;
uint32_t variant;
uint32_t stack_count;
JanetFFICallingConvention cc;
JanetFFIPrimType ret_type;
JanetFFIMapping regs[JANET_FFI_MAX_REGS];
JanetFFIMapping fp_regs[JANET_FFI_MAX_FP_REGS];
JanetFFIMapping stack[JANET_FFI_MAX_STACK];
JanetFFIType ret_type;
JanetFFIMapping args[JANET_FFI_MAX_ARGS];
} JanetFFISignature;
int signature_mark(void *p, size_t s) {
(void) s;
JanetFFISignature *sig = p;
for (uint32_t i = 0; i < sig->arg_count; i++) {
JanetFFIType t = sig->args[i].type;
if (t.prim == JANET_FFI_TYPE_STRUCT) {
janet_mark(janet_wrap_abstract(t.st));
}
}
return 0;
}
static const JanetAbstractType janet_signature_type = {
"core/ffi-signature",
JANET_ATEND_NAME
NULL,
signature_mark,
JANET_ATEND_GCMARK
};
int struct_mark(void *p, size_t s) {
(void) s;
JanetFFIStruct *st = p;
for (uint32_t i = 0; i < st->field_count; i++) {
JanetFFIType t = st->fields[i];
if (t.prim == JANET_FFI_TYPE_STRUCT) {
janet_mark(janet_wrap_abstract(t.st));
}
}
return 0;
}
static const JanetAbstractType janet_struct_type = {
"core/ffi-struct",
NULL,
struct_mark,
JANET_ATEND_GCMARK
};
static JanetFFIType prim_type(JanetFFIPrimType pt) {
JanetFFIType t;
t.prim = pt;
t.st = NULL;
return t;
}
static size_t type_size(JanetFFIType t) {
if (t.prim == JANET_FFI_TYPE_STRUCT) {
return t.st->size;
} else {
return janet_ffi_type_info[t.prim].size;
}
}
static size_t type_align(JanetFFIType t) {
if (t.prim == JANET_FFI_TYPE_STRUCT) {
return t.st->align;
} else {
return janet_ffi_type_info[t.prim].align;
}
}
static JanetFFICallingConvention decode_ffi_cc(const uint8_t *name) {
if (!janet_cstrcmp(name, "sysv64")) return JANET_FFI_CC_SYSV_64;
if (!janet_cstrcmp(name, "default")) {
@@ -133,12 +199,6 @@ static JanetFFICallingConvention decode_ffi_cc(const uint8_t *name) {
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;
@@ -158,81 +218,61 @@ static JanetFFIPrimType decode_ffi_prim(const uint8_t *name) {
if (!janet_cstrcmp(name, "size")) return JANET_FFI_TYPE_UINT32;
if (!janet_cstrcmp(name, "ssize")) return JANET_FFI_TYPE_INT32;
#endif
/* aliases */
if (!janet_cstrcmp(name, "char")) return JANET_FFI_TYPE_INT8;
if (!janet_cstrcmp(name, "short")) return JANET_FFI_TYPE_INT16;
if (!janet_cstrcmp(name, "int")) return JANET_FFI_TYPE_INT32;
if (!janet_cstrcmp(name, "long")) return JANET_FFI_TYPE_INT64;
if (!janet_cstrcmp(name, "byte")) return JANET_FFI_TYPE_UINT8;
if (!janet_cstrcmp(name, "ushort")) return JANET_FFI_TYPE_UINT16;
if (!janet_cstrcmp(name, "uint")) return JANET_FFI_TYPE_UINT32;
if (!janet_cstrcmp(name, "ulong")) return JANET_FFI_TYPE_UINT64;
janet_panicf("unknown machine type %s", name);
}
static int is_fp_type(JanetFFIPrimType prim) {
return prim == JANET_FFI_TYPE_DOUBLE || prim == JANET_FFI_TYPE_FLOAT;
static JanetFFIType decode_ffi_type(Janet x);
static JanetFFIStruct *build_struct_type(int32_t argc, const Janet *argv) {
JanetFFIStruct *st = janet_abstract(&janet_struct_type,
sizeof(JanetFFIStruct) + argc * sizeof(JanetFFIType));
st->field_count = argc;
st->size = 0;
st->align = 1;
for (int32_t i = 0; i < argc; i++) {
st->fields[i] = decode_ffi_type(argv[i]);
size_t el_align = type_align(st->fields[i]);
size_t el_size = type_size(st->fields[i]);
if (el_align > st->align) st->align = el_align;
st->size = el_size + (((st->size + el_align - 1) / el_align) * el_align);
}
return st;
}
JANET_CORE_FN(cfun_ffi_signature,
"(native-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 fp_reg_count = 0;
uint32_t stack_count = 0;
uint32_t variant = 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;
uint32_t max_fp_regs = JANET_FFI_MAX_FP_REGS;
JanetFFIMapping regs[JANET_FFI_MAX_REGS];
JanetFFIMapping stack[JANET_FFI_MAX_STACK];
JanetFFIMapping fp_regs[JANET_FFI_MAX_FP_REGS];
for (int i = 0; i < JANET_FFI_MAX_REGS; i++) {
regs[i].prim = JANET_FFI_TYPE_VOID;
regs[i].argn = 0;
static JanetFFIType decode_ffi_type(Janet x) {
if (janet_checktype(x, JANET_KEYWORD)) {
return prim_type(decode_ffi_prim(janet_unwrap_keyword(x)));
}
for (int i = 0; i < JANET_FFI_MAX_FP_REGS; i++) {
fp_regs[i].prim = JANET_FFI_TYPE_VOID;
fp_regs[i].argn = 0;
JanetFFIType ret;
ret.prim = JANET_FFI_TYPE_STRUCT;
if (janet_checkabstract(x, &janet_struct_type)) {
ret.st = janet_unwrap_abstract(x);
return ret;
}
for (int i = 0; i < JANET_FFI_MAX_STACK; i++) {
stack[i].prim = JANET_FFI_TYPE_VOID;
stack[i].argn = 0;
}
switch (cc) {
default:
break;
case JANET_FFI_CC_SYSV_64:
max_regs = 6;
max_fp_regs = 8;
if (is_fp_type(ret_type)) variant = 1;
break;
}
for (int32_t i = 2; i < argc; i++) {
JanetFFIPrimType ptype = decode_ffi_prim(janet_getkeyword(argv, i));
int is_fp = is_fp_type(ptype);
if (is_fp && fp_reg_count < max_fp_regs) {
fp_regs[fp_reg_count].argn = i;
fp_regs[fp_reg_count++].prim = ptype;
} else if (!is_fp && reg_count < max_regs) {
regs[reg_count].argn = i;
regs[reg_count++].prim = ptype;
} else {
stack[stack_count].argn = i;
stack[stack_count++].prim = ptype;
frame_size += janet_ffi_type_info[ptype].size;
}
int32_t len;
const Janet *els;
if (janet_indexed_view(x, &els, &len)) {
ret.st = build_struct_type(len, els);
return ret;
} else {
janet_panicf("bad native type %v", x);
}
}
/* Create signature abstract value */
JanetFFISignature *abst = janet_abstract(&janet_signature_type, sizeof(JanetFFISignature));
abst->frame_size = frame_size;
abst->reg_count = reg_count;
abst->fp_reg_count = fp_reg_count;
abst->stack_count = stack_count;
abst->cc = cc;
abst->ret_type = ret_type;
abst->arg_count = stack_count + reg_count + fp_reg_count;
abst->variant = variant;
memcpy(abst->regs, regs, sizeof(JanetFFIMapping) * JANET_FFI_MAX_REGS);
memcpy(abst->fp_regs, fp_regs, sizeof(JanetFFIMapping) * JANET_FFI_MAX_FP_REGS);
memcpy(abst->stack, stack, sizeof(JanetFFIMapping) * JANET_FFI_MAX_STACK);
return janet_wrap_abstract(abst);
JANET_CORE_FN(cfun_ffi_struct,
"(native-struct & types)",
"Create a struct type descriptor that can be used to pass structs into native functions. ") {
janet_arity(argc, 1, -1);
return janet_wrap_abstract(build_struct_type(argc, argv));
}
static void *janet_ffi_getpointer(const Janet *argv, int32_t n) {
@@ -249,105 +289,246 @@ static void *janet_ffi_getpointer(const Janet *argv, int32_t n) {
}
}
static uint64_t janet_ffi_reg64(const Janet *argv, JanetFFIMapping mapping) {
JanetFFIPrimType ptype = mapping.prim;
int32_t n = mapping.argn;
union {
float f;
double d;
uint64_t reg;
} u;
switch (ptype) {
/* Write a value given by some Janet values and an FFI type as it would appear in memory.
* The alignment and space available is assumed to already be sufficient */
static void janet_ffi_write_one(void *to, const Janet *argv, int32_t n, JanetFFIType type) {
switch (type.prim) {
case JANET_FFI_TYPE_VOID:
default:
janet_panic("nyi");
return 0;
break;
case JANET_FFI_TYPE_STRUCT: {
JanetView els = janet_getindexed(argv, n);
uint32_t cursor = 0;
JanetFFIStruct *st = type.st;
if ((uint32_t) els.len != st->field_count) {
janet_panicf("wrong number of fields in struct, expected %d, got %d",
(int32_t) st->field_count, els.len);
}
for (int32_t i = 0; i < els.len; i++) {
JanetFFIType tp = st->fields[i];
size_t align = type_align(tp);
size_t size = type_size(tp);
cursor = ((cursor + align - 1) / align) * align;
janet_ffi_write_one(to + cursor, els.items, i, tp);
cursor += size;
}
}
break;
case JANET_FFI_TYPE_DOUBLE:
u.d = janet_getnumber(argv, n);
return u.reg;
((double *)(to))[0] = janet_getnumber(argv, n);
break;
case JANET_FFI_TYPE_FLOAT:
u.f = janet_getnumber(argv, n);
return u.reg;
case JANET_FFI_TYPE_VOID:
return 0;
((float *)(to))[0] = janet_getnumber(argv, n);
break;
case JANET_FFI_TYPE_PTR:
return (uint64_t) janet_ffi_getpointer(argv, n);
((void **)(to))[0] = janet_ffi_getpointer(argv, n);
break;
case JANET_FFI_TYPE_BOOL:
return (uint64_t) janet_getboolean(argv, n);
case JANET_FFI_TYPE_SHORT:
case JANET_FFI_TYPE_INT:
((bool *)(to))[0] = janet_getboolean(argv, n);
break;
case JANET_FFI_TYPE_INT8:
((int8_t *)(to))[0] = janet_getinteger(argv, n);
break;
case JANET_FFI_TYPE_INT16:
((int16_t *)(to))[0] = janet_getinteger(argv, n);
break;
case JANET_FFI_TYPE_INT32:
((int32_t *)(to))[0] = janet_getinteger(argv, n);
break;
case JANET_FFI_TYPE_INT64:
case JANET_FFI_TYPE_LONG:
return (uint64_t) janet_getinteger64(argv, n);
case JANET_FFI_TYPE_USHORT:
case JANET_FFI_TYPE_UINT:
((int64_t *)(to))[0] = janet_getinteger64(argv, n);
break;
case JANET_FFI_TYPE_UINT8:
((uint8_t *)(to))[0] = janet_getuinteger64(argv, n);
break;
case JANET_FFI_TYPE_UINT16:
((uint16_t *)(to))[0] = janet_getuinteger64(argv, n);
break;
case JANET_FFI_TYPE_UINT32:
((uint32_t *)(to))[0] = janet_getuinteger64(argv, n);
break;
case JANET_FFI_TYPE_UINT64:
case JANET_FFI_TYPE_ULONG:
return janet_getuinteger64(argv, n);
((uint64_t *)(to))[0] = janet_getuinteger64(argv, n);
break;
}
}
static Janet janet_ffi_from64(uint64_t ret, JanetFFIPrimType ret_type) {
union {
float f;
double d;
uint64_t reg;
} u;
switch (ret_type) {
default:
janet_panic("nyi");
return janet_wrap_nil();
case JANET_FFI_TYPE_FLOAT:
u.reg = ret;
return janet_wrap_number(u.f);
case JANET_FFI_TYPE_DOUBLE:
u.reg = ret;
return janet_wrap_number(u.d);
case JANET_FFI_TYPE_VOID:
return janet_wrap_nil();
static int is_fp_type(JanetFFIType type) {
return type.prim == JANET_FFI_TYPE_DOUBLE || type.prim == JANET_FFI_TYPE_FLOAT;
}
static JanetFFIMapping void_mapping(void) {
JanetFFIMapping m;
m.type = prim_type(JANET_FFI_TYPE_VOID);
m.spec = JANET_SYSV64_NO_CLASS;
m.offset = 0;
return m;
}
/* AMD64 ABI Draft 0.99.7 – November 17, 2014 – 15:08
* See section 3.2.3 Parameter Passing */
static JanetFFIWordSpec sysv64_classify(JanetFFIType type) {
switch (type.prim) {
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_SYSV64_INTEGER;
case JANET_FFI_TYPE_DOUBLE:
case JANET_FFI_TYPE_FLOAT:
return JANET_SYSV64_SSE;
case JANET_FFI_TYPE_STRUCT: {
JanetFFIStruct *st = type.st;
if (st->size > 16) return JANET_SYSV64_MEMORY;
JanetFFIWordSpec clazz = JANET_SYSV64_NO_CLASS;
for (uint32_t i = 0; i < st->field_count; i++) {
JanetFFIWordSpec next_class = sysv64_classify(st->fields[i]);
if (next_class != clazz) {
if (clazz == JANET_SYSV64_NO_CLASS) {
clazz = next_class;
} else if (clazz == JANET_SYSV64_MEMORY || next_class == JANET_SYSV64_MEMORY) {
clazz = JANET_SYSV64_MEMORY;
} else if (clazz == JANET_SYSV64_INTEGER || next_class == JANET_SYSV64_INTEGER) {
clazz = JANET_SYSV64_INTEGER;
} else if (next_class == JANET_SYSV64_X87 || next_class == JANET_SYSV64_X87UP
|| next_class == JANET_SYSV64_COMPLEX_X87) {
clazz = JANET_SYSV64_MEMORY;
} else {
clazz = JANET_SYSV64_SSE;
}
}
}
return clazz;
}
case JANET_FFI_TYPE_VOID:
default:
janet_panic("nyi");
return JANET_SYSV64_NO_CLASS;
}
}
JANET_CORE_FN(cfun_ffi_signature,
"(native-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 variant = 0;
uint32_t arg_count = argc - 2;
uint32_t stack_count = 0;
JanetFFICallingConvention cc = decode_ffi_cc(janet_getkeyword(argv, 0));
JanetFFIType ret_type = decode_ffi_type(argv[1]);
JanetFFIMapping mappings[JANET_FFI_MAX_ARGS];
for (int i = 0; i < JANET_FFI_MAX_ARGS; i++) mappings[i] = void_mapping();
switch (cc) {
default:
janet_panicf("calling convention %v unsupported", argv[0]);
break;
case JANET_FFI_CC_SYSV_64: {
if (is_fp_type(ret_type)) variant = 1;
for (uint32_t i = 0; i < arg_count; i++) {
mappings[i].type = decode_ffi_type(argv[i + 2]);
mappings[i].offset = 0;
mappings[i].spec = sysv64_classify(mappings[i].type);
}
/* Spill register overflow to memory */
uint32_t next_register = 0;
uint32_t next_fp_register = 0;
const uint32_t max_regs = 6;
const uint32_t max_fp_regs = 8;
for (uint32_t i = 0; i < arg_count; i++) {
size_t el_size = (type_size(mappings[i].type) + 7) / 8;
switch (mappings[i].spec) {
default:
janet_panicf("nyi: %d", mappings[i].spec);
case JANET_SYSV64_INTEGER: {
if (next_register < max_regs) {
mappings[i].offset = next_register++;
} else {
mappings[i].spec = JANET_SYSV64_MEMORY;
mappings[i].offset = stack_count;
stack_count += el_size;
}
break;
}
case JANET_SYSV64_SSE: {
if (next_fp_register < max_fp_regs) {
mappings[i].offset = next_fp_register++;
} else {
mappings[i].spec = JANET_SYSV64_MEMORY;
mappings[i].offset = stack_count;
stack_count += el_size;
}
break;
}
case JANET_SYSV64_MEMORY: {
mappings[i].offset = stack_count;
stack_count += el_size;
}
}
/* Invert stack */
for (uint32_t i = 0; i < arg_count; i++) {
if (mappings[i].spec == JANET_SYSV64_MEMORY) {
uint32_t old_offset = mappings[i].offset;
size_t el_size = type_size(mappings[i].type);
mappings[i].offset = stack_count - ((el_size + 7) / 8) - old_offset;
}
}
}
}
break;
}
/* Create signature abstract value */
JanetFFISignature *abst = janet_abstract(&janet_signature_type, sizeof(JanetFFISignature));
abst->frame_size = frame_size;
abst->cc = cc;
abst->ret_type = ret_type;
abst->arg_count = arg_count;
abst->variant = variant;
abst->stack_count = stack_count;
memcpy(abst->args, mappings, sizeof(JanetFFIMapping) * JANET_FFI_MAX_ARGS);
return janet_wrap_abstract(abst);
}
static Janet janet_ffi_sysv64(JanetFFISignature *signature, void *function_pointer, const Janet *argv) {
uint64_t ret, rethi;
(void) rethi; /* at some point we will support more complex return types */
union {
float f;
double d;
uint64_t reg;
} u;
uint64_t regs[6];
uint64_t fp_regs[8];
for (uint32_t i = 0; i < signature->reg_count; i++) {
regs[i] = janet_ffi_reg64(argv, signature->regs[i]);
}
for (uint32_t i = 0; i < signature->fp_reg_count; i++) {
fp_regs[i] = janet_ffi_reg64(argv, signature->fp_regs[i]);
}
uint64_t *stack = alloca(sizeof(uint64_t) * signature->stack_count);
for (uint32_t i = 0; i < signature->stack_count; i++) {
stack[signature->stack_count - 1 - i] = janet_ffi_reg64(argv, signature->stack[i]);
for (uint32_t i = 0; i < signature->arg_count; i++) {
uint64_t *to;
int32_t n = i + 2;
JanetFFIMapping arg = signature->args[i];
switch (arg.spec) {
default:
janet_panic("nyi");
case JANET_SYSV64_INTEGER:
to = regs + arg.offset;
break;
case JANET_SYSV64_SSE:
to = fp_regs + arg.offset;
break;
case JANET_SYSV64_MEMORY:
to = stack + arg.offset;
break;
}
janet_ffi_write_one(to, argv, n, arg.type);
}
/* !!ACHTUNG!! */
@@ -396,7 +577,7 @@ static Janet janet_ffi_sysv64(JanetFFISignature *signature, void *function_point
: FFI_ASM_OUTPUTS
: FFI_ASM_INPUTS
: "rax", "rdi", "rsi", "rdx", "rcx", "r8", "r9", "r10", "r11");
return janet_ffi_from64(ret, signature->ret_type);
break;
case 1:
__asm__(FFI_ASM_PRELUDE
"call *%2\n\t"
@@ -405,14 +586,43 @@ static Janet janet_ffi_sysv64(JanetFFISignature *signature, void *function_point
: FFI_ASM_OUTPUTS
: FFI_ASM_INPUTS
: "rax", "rdi", "rsi", "rdx", "rcx", "r8", "r9", "r10", "r11");
return janet_ffi_from64(ret, signature->ret_type);
break;
}
#undef FFI_ASM_PRELUDE
#undef FFI_ASM_OUTPUTS
#undef FFI_ASM_INPUTS
return janet_wrap_nil();
/* TODO - compound type returns */
switch (signature->ret_type.prim) {
default:
janet_panic("nyi");
return janet_wrap_nil();
case JANET_FFI_TYPE_FLOAT:
u.reg = ret;
return janet_wrap_number(u.f);
case JANET_FFI_TYPE_DOUBLE:
u.reg = ret;
return janet_wrap_number(u.d);
case JANET_FFI_TYPE_VOID:
return janet_wrap_nil();
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_INT8:
case JANET_FFI_TYPE_INT16:
case JANET_FFI_TYPE_INT32:
return janet_wrap_integer((int32_t) ret);
case JANET_FFI_TYPE_INT64:
return janet_wrap_integer((int64_t) ret);
case JANET_FFI_TYPE_UINT8:
case JANET_FFI_TYPE_UINT16:
case JANET_FFI_TYPE_UINT32:
case JANET_FFI_TYPE_UINT64:
/* TODO - fix 64 bit unsigned return */
return janet_wrap_number(ret);
}
}
JANET_CORE_FN(cfun_ffi_call,
@@ -435,6 +645,7 @@ void janet_lib_ffi(JanetTable *env) {
JanetRegExt ffi_cfuns[] = {
JANET_CORE_REG("native-signature", cfun_ffi_signature),
JANET_CORE_REG("native-call", cfun_ffi_call),
JANET_CORE_REG("native-struct", cfun_ffi_struct),
JANET_REG_END
};
janet_core_cfuns_ext(env, NULL, ffi_cfuns);

1
src/core/util.h
View File

@@ -32,6 +32,7 @@
#include <stdio.h>
#include <errno.h>
#include <stddef.h>
#include <stdbool.h>
#ifndef _MSC_VER
#include <alloca.h>