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working ffi

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lxsang 2019-05-03 13:17:45 +02:00
parent 9c1837d939
commit 0ac77828e7
4 changed files with 338 additions and 95 deletions
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2
lib.mk
View File

@ -2,7 +2,7 @@ include ../../var.mk
main:$(LIB_OBJ) $(LIB_NAME)
%.o: %.c
$(CC) $(LIB_CFLAGS) $(LIB_INC) -fPIC $(LUA_H) -I$(REAL_PLUGINS_BASE) -c $< -o $@
$(CC) $(LIB_CFLAGS) -D DEBUG $(LIB_INC) -fPIC $(LUA_H) -I$(REAL_PLUGINS_BASE) -c $< -o $@
%.$(LIB_EXT): %.o
-mkdir $(LIB_BUILD_DIR)

70
lib/ffi/example/example.lua
View File

@ -1,5 +1,5 @@
local path = "/home/blackjack/workspace/ant-http/plugins/antd-lua-plugin/lib/ffi/example/libtest.so"
require("cif")
local path = "/Users/mrsang/Google Drive/ushare/cwp/ant-http/plugins/antd-lua-plugin/lib/ffi/example/libtest.so"
local lib = nil
local fn = nil
local rettype = nil
@ -7,38 +7,54 @@ local argtype = nil
lib = FFI.load(path)
if lib then
-- now try to lookup for the greet function
echo("looking for greet")
fn = FFI.lookup(lib,"greet")
if fn then
-- now the function found
-- now the function
-- tried to called it
rettype = FFI.atomic(FFI.type.VOID) -- void
if rettype then
argtype = {
FFI.atomic(FFI.type.POINTER),
FFI.atomic(FFI.type.DOUBLE),
FFI.atomic(FFI.type.SINT64),
FFI.atomic(FFI.type.SINT8)
} -- pointer
if(argtype) then
-- call the function
local r = FFI.call(rettype, argtype, fn, {"hello world", 0.987, -76, 65})
if r then
echo("BIG SUCCESS")
else
echo("HELL FAIL")
end
else
echo("argtype not found")
end
rettype = FFI.atomic(FFI.type.UINT8) -- voidn
argtype = {
FFI.atomic(FFI.type.POINTER),
FFI.atomic(FFI.type.DOUBLE),
FFI.atomic(FFI.type.SINT64),
FFI.atomic(FFI.type.SINT8)
} -- pointer
-- call the function
local r = FFI.call(rettype, argtype, fn, {"hello world", 0.987, -76, 65})
if r then
echo(r)
else
echo("return type not found")
echo("HELL FAIL")
end
else
echo("unable to find greet")
end
fn = FFI.lookup(lib, "test_struct")
if fn then
local struct1 = FFI.struct({
FFI.atomic(FFI.type.UINT8), -- char
FFI.atomic(FFI.type.SINT32), -- char
FFI.atomic(FFI.type.SINT16), -- char
FFI.atomic(FFI.type.UINT8), -- char
})
local struct = FFI.struct({
FFI.atomic(FFI.type.UINT8), -- char
struct1,
FFI.atomic(FFI.type.SINT32), -- int
FFI.atomic(FFI.type.UINT8), -- char
})
rettype = struct --FFI.atomic(FFI.type.DOUBLE)
echo("call with struct")
local r = FFI.call(rettype,{struct},fn,{{65, {66, 2048, -97,67},-1024, 68}})
if r then echo(JSON.encode(r)) end
--echo(JSON.encode(FFI.meta(struct1)))
end
fn = FFI.lookup(lib, "test_string")
if(fn) then
local buff = FFI.new(256)
FFI.call(FFI.atomic(FFI.type.VOID),{FFI.atomic(FFI.type.POINTER), FFI.atomic(FFI.type.POINTER)}, fn, {buff,"Hello world"})
echo(FFI.string(buff))
end
FFI.unloadAll()
else
echo("unable to load the lib")
end
echo("end the day")

30
lib/ffi/example/lib.c
View File

@ -1,6 +1,34 @@
#include <stdio.h>
void greet(const char* msg, float num, int sint, char c)
typedef struct{
char a;
int b;
short c;
char d;
} inner_t;
typedef struct{
char a;
inner_t b;
int c;
char d;
} test_t;
char greet(const char* msg, float num, int sint, char c)
{
printf("%s: '%f' '%d' '%c'\n", msg, num, sint, c);
return 'A';
}
test_t test_struct(test_t data)
{
printf("data is '%c' '%c' '%d' '%d' '%c' '%d' '%c'\n", data.a, data.b.a, data.b.b, data.b.c, data.b.d, data.c, data.d);
return data;
}
void test_string(char* buff, const char* a)
{
sprintf(buff,"you say %s", a);
printf("%s\n", buff);
}

331
lib/ffi/ffi.c
View File

@ -22,11 +22,6 @@
#define MAX_FN_ARGC 32
typedef struct {
uint8_t allocated;
uint8_t is_pointer;
void* data;
} arg_pointer_t;
// define atomic type
typedef enum ffi_atomic_t {
L_FFI_TYPE_VOID,
@ -146,84 +141,102 @@ static int l_ffi_prepare(lua_State* L, ffi_type** argvtype, int idx)
return argc;
}
void parser_value(lua_State* L, int idx, ffi_type* ffitype, arg_pointer_t * ptr)
void parser_value(lua_State* L, int idx, ffi_type* ffitype, void * data)
{
ptr->allocated = 1;
ptr->is_pointer = 0;
intptr_t address = (intptr_t) data;
int offset = 0;
int pad = 0;
int i = 0;
switch(ffitype->type)
{
case FFI_TYPE_POINTER:
ptr->allocated = 0;
ptr->is_pointer = 1;
ptr->data = (void*)lua_tostring(L, idx);
if(lua_isstring(L,idx))
*((void**)data) = (void*)lua_tostring(L, idx);
else
*((void**)data) = (void*)lua_touserdata(L, idx);
return;
case FFI_TYPE_UINT8:
ptr->data = (void*) malloc(ffitype->size);
*((uint8_t*)ptr->data) = (uint8_t)lua_tonumber(L,idx);
*((uint8_t*)data) = (uint8_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_SINT8:
ptr->data = (void*) malloc(ffitype->size);
*((int8_t*)ptr->data) = (int8_t)lua_tonumber(L,idx);
*((int8_t*)data) = (int8_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_UINT16:
ptr->data = (void*) malloc(ffitype->size);
*((uint16_t*)ptr->data) = (uint16_t)lua_tonumber(L,idx);
*((uint16_t*)data) = (uint16_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_SINT16:
ptr->data = (void*) malloc(ffitype->size);
*((int16_t*)ptr->data) = (int16_t)lua_tonumber(L,idx);
*((int16_t*)data) = (int16_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_UINT32:
ptr->data = (void*) malloc(ffitype->size);
*((uint32_t*)ptr->data) = (uint32_t)lua_tonumber(L,idx);
*((uint32_t*)data) = (uint32_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_SINT32:
ptr->data = (void*) malloc(ffitype->size);
*((int32_t*)ptr->data) = (int32_t)lua_tonumber(L,idx);
*((int32_t*)data) = (int32_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_UINT64:
ptr->data = (void*) malloc(ffitype->size);
*((uint64_t*)ptr->data) = (uint64_t)lua_tonumber(L,idx);
*((uint64_t*)data) = (uint64_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_SINT64:
ptr->data = (void*) malloc(ffitype->size);
*((int64_t*)ptr->data) = (int64_t)lua_tonumber(L,idx);
*((int64_t*)data) = (int64_t)lua_tonumber(L,idx);
return;
case FFI_TYPE_LONGDOUBLE:
/*This is bug in lua*/
ptr->data = (void*) malloc(ffitype->size);
*((long double*)ptr->data) = (long double)lua_tonumber(L,idx);
*((long double*)data) = (long double)lua_tonumber(L,idx);
return;
case FFI_TYPE_FLOAT:
case FFI_TYPE_DOUBLE:
ptr->data = (void*) malloc(ffitype->size);
*((float*)ptr->data) = (float)lua_tonumber(L,idx);
*((float*)data) = (float)lua_tonumber(L,idx);
return;
/*case FFI_TYPE_STRUCT:
// not implemented yet
return NULL;
break;*/
default:
ptr->allocated = 0;
ptr->is_pointer = 0;
ptr->data = NULL;
break;
case FFI_TYPE_STRUCT:
// loop through the table
lua_pushvalue(L,idx);
// stack now contains: -1 => table
lua_pushnil(L);
// stack now contains: -1 => nil, -2 => table
while(lua_next(L, -2))
{
// stack now contains: -1 => value; -2 key; -3 table
parser_value(L, -1, ffitype->elements[i],data+offset);
// pop the value, leaving the original key
lua_pop(L,1);
// stack now contains: -1 key; -2 table
// recalculate offs
address += ffitype->elements[i]->size;
if(ffitype->elements[i+1])
{
pad = address % ffitype->elements[i+1]->alignment;
if( pad != 0)
{
pad = ffitype->elements[i+1]->alignment - pad;
}
address += pad;
offset += ffitype->elements[i]->size + pad;
}
i++;
}
// lua_next return 0, it popout the key at -1, leaving the table
// so, popout the table
lua_pop(L,1);
return;
default: return;
}
}
static void parser_arguments(lua_State* L, int idx, arg_pointer_t* argv, ffi_type** argvtype)
static void parser_arguments(lua_State* L, int idx, void** argv, ffi_type** argvtype)
{
// loop through table
lua_pushvalue(L,idx);
@ -234,7 +247,8 @@ static void parser_arguments(lua_State* L, int idx, arg_pointer_t* argv, ffi_typ
while(lua_next(L, -2))
{
// stack now contains: -1 => value; -2 key; -3 table
parser_value(L, -1, argvtype[i],&argv[i]);
argv[i] = (void*)malloc(argvtype[i]->size);
parser_value(L, -1, argvtype[i],argv[i]);
i++;
// pop the value, leaving the original key
lua_pop(L,1);
@ -245,25 +259,102 @@ static void parser_arguments(lua_State* L, int idx, arg_pointer_t* argv, ffi_typ
lua_pop(L,1);
}
static void free_arguments(arg_pointer_t* argv, int argc)
static void ffi_post_call(lua_State* L, void* ret, ffi_type* rettype)
{
for(int i = 0; i< argc; i++)
if(!ret)
{
if(argv[i].allocated)
free(argv[i].data);
lua_pushnil(L);
return;
}
int i = 0;
intptr_t address = (intptr_t) ret;
int offset = 0;
int pad = 0;
switch (rettype->type)
{
case FFI_TYPE_POINTER:
lua_pushlightuserdata(L,ret);
break;
case FFI_TYPE_UINT8:
lua_pushnumber(L, (lua_Number)(*((uint8_t*)ret)));
break;
case FFI_TYPE_SINT8:
lua_pushnumber(L, (lua_Number)(*((int8_t*)ret)));
break;
case FFI_TYPE_UINT16:
lua_pushnumber(L, (lua_Number)(*((uint16_t*)ret)));
break;
case FFI_TYPE_SINT16:
lua_pushnumber(L, (lua_Number)(*((int16_t*)ret)));
break;
case FFI_TYPE_UINT32:
lua_pushnumber(L, (lua_Number)(*((uint32_t*)ret)));
break;
case FFI_TYPE_SINT32:
lua_pushnumber(L, (lua_Number)(*((int32_t*)ret)));
break;
case FFI_TYPE_UINT64:
lua_pushnumber(L, (lua_Number)(*((uint64_t*)ret)));
break;
case FFI_TYPE_SINT64:
lua_pushnumber(L, (lua_Number)(*((int64_t*)ret)));
break;
case FFI_TYPE_LONGDOUBLE:
case FFI_TYPE_FLOAT:
case FFI_TYPE_DOUBLE:
lua_pushnumber(L, *((double*)ret));
break;
case FFI_TYPE_STRUCT:
lua_newtable(L);
for ( i = 0; rettype->elements[i] != NULL; i++)
{
lua_pushnumber(L,i);
ffi_post_call(L, ret + offset,rettype->elements[i]);
lua_settable(L, -3);
address += rettype->elements[i]->size;
if(rettype->elements[i+1])
{
pad = address % rettype->elements[i+1]->alignment;
if( pad != 0)
{
pad = rettype->elements[i+1]->alignment - pad;
}
address += pad;
offset += rettype->elements[i]->size + pad;
}
}
break;
default:
lua_pushnil(L);
break;
}
}
/*
static void dump(ffi_type* st)
{
printf("Type: %d %d\n", st->size, st->alignment);
if(st->type == FFI_TYPE_STRUCT)
for (int i = 0; st->elements[i] != NULL; i++)
{
dump(st->elements[i]);
}
}
*/
static int l_ffi_call(lua_State* L)
{
ffi_type * argvtype[MAX_FN_ARGC];
void* argv[MAX_FN_ARGC];
ffi_type * rettype = lua_touserdata(L,1);
int argc = l_ffi_prepare(L, argvtype, 2);
arg_pointer_t* args;
ffi_arg ret;
int len = lua_rawlen(L,4);
void* ret = NULL;
ffi_cif cif;
//dump(argvtype[0]);
if(ffi_prep_cif(&cif,FFI_DEFAULT_ABI,argc,rettype,argvtype) == FFI_OK)
{
void * fn = lua_touserdata(L,3);
@ -273,34 +364,28 @@ static int l_ffi_call(lua_State* L)
lua_pushboolean(L,0);
return 1;
}
if(lua_rawlen(L,4) != argc)
if(len != argc)
{
LOG("%s\n", "Argument count does not not match");
LOG("Argument count does not not match: expected %d, but have: %d\n", argc, len);
lua_pushboolean(L,0);
return 1;
}
// the arguments of the function is at 4th position on the stack
// we need to loop through this table and check if argument type
// is correct to the definition in argvtype
args = (arg_pointer_t*)malloc(sizeof(arg_pointer_t)*(argc+1));
//ret = (void*)malloc(rettype->size);
// now parser the argument
parser_arguments(L,4,args,argvtype);
parser_arguments(L,4,argv,argvtype);
if(rettype->type != FFI_TYPE_VOID)
ret = (void*)malloc(rettype->size);
ffi_call(&cif,fn, ret, argv);
for(int i = 0; i< argc; i++)
{
if(args[i].is_pointer && args[i].data)
argv[i] = &(args[i].data);
else
argv[i] = args[i].data;
if(argv[i]) free(argv[i]);
}
ffi_call(&cif,fn, &ret, argv);
free_arguments(args, argc);
if(args) free(args);
lua_pushboolean(L,1);
ffi_post_call(L,ret, rettype);
if(ret) free(ret);
//lua_pushboolean(L,1);
return 1;
}
printf("fail to prepare %d\n");
lua_pushboolean(L,0);
return 1;
@ -325,7 +410,9 @@ static int l_ffi_struct(lua_State* L)
// 1st element in the stack is the
// struct table
int len = lua_rawlen(L,1);
ffi_type* cstruct = lua_newuserdata(L, (len+2) * sizeof(ffi_type) );
ffi_type* cstruct = lua_newuserdata(L,sizeof(ffi_type) + (len+1) * sizeof(ffi_type*));
void *ptr = (void*)cstruct+(sizeof(ffi_type));
cstruct->elements = (ffi_type**)ptr;
int i = 0;
cstruct->size = cstruct->alignment = 0;
cstruct->type = FFI_TYPE_STRUCT;
@ -353,6 +440,112 @@ static int l_ffi_struct(lua_State* L)
return 1;
}
static int l_ffi_new(lua_State* L)
{
int size = luaL_checkinteger(L, 1);
void* ptr = lua_newuserdata(L, size);
memset(ptr,size,0);
return 1;
}
static int l_ffi_meta(lua_State* L)
{
ffi_type* type = lua_touserdata(L,1);
if(type)
{
lua_newtable(L);
lua_pushstring(L,"size");
lua_pushnumber(L, type->size);
lua_settable(L, -3);
lua_pushstring(L,"alignment");
lua_pushnumber(L, type->alignment);
lua_settable(L, -3);
lua_pushstring(L,"type");
switch (type->type)
{
case FFI_TYPE_POINTER:
lua_pushstring(L, "POINTER");
break;
case FFI_TYPE_UINT8:
lua_pushstring(L, "UINT8");
break;
case FFI_TYPE_SINT8:
lua_pushstring(L, "SINT8");
break;
case FFI_TYPE_UINT16:
lua_pushstring(L, "UINT16");
break;
case FFI_TYPE_SINT16:
lua_pushstring(L, "SINT16");
break;
case FFI_TYPE_UINT32:
lua_pushstring(L, "UINT32");
break;
case FFI_TYPE_SINT32:
lua_pushstring(L, "SINT32");
break;
case FFI_TYPE_UINT64:
lua_pushstring(L, "UINT64");
break;
case FFI_TYPE_SINT64:
lua_pushstring(L, "SINT64");
break;
case FFI_TYPE_LONGDOUBLE:
lua_pushstring(L, "LONGDOUBLE");
break;
case FFI_TYPE_FLOAT:
lua_pushstring(L, "FLOAT");
break;
case FFI_TYPE_DOUBLE:
lua_pushstring(L, "DOUBLE");
break;
case FFI_TYPE_STRUCT:
lua_pushstring(L, "STRUCT");
break;
default:
lua_pushnil(L);
break;
}
lua_settable(L, -3);
return 1;
}
lua_pushnil(L);
return 1;
}
static int l_ffi_offset(lua_State* L)
{
void* ptr = lua_touserdata(L, 1);
int off = luaL_checkinteger(L,2);
if(ptr)
{
lua_pushlightuserdata(L, ptr + off);
return 1;
}
lua_pushnil(L);
return 1;
}
static int l_ffi_string(lua_State* L)
{
void* ptr = lua_touserdata(L,1);
if(ptr)
lua_pushstring(L, (const char*)ptr);
else
lua_pushstring(L, "");
return 1;
}
static int l_ffi_free(lua_State* L)
{
void* ptr = lua_touserdata(L,1);
if(ptr)
free(ptr);
lua_pushboolean(L, 1);
return 1;
}
static const struct luaL_Reg _lib [] = {
{"dlopen", l_dlopen},
{"dlsym",l_dlsym},
@ -360,6 +553,12 @@ static const struct luaL_Reg _lib [] = {
{"call",l_ffi_call},
{"atomic", l_ffi_atomic_type},
{"struct", l_ffi_struct },
{"new", l_ffi_new},
{"meta", l_ffi_meta},
{"at", l_ffi_offset},
// special case: pointer to string
{"string", l_ffi_string},
{"free", l_ffi_free},
{NULL,NULL}
};