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/*
* Copyright (c) 2009-2011 Wayne Meissner
*
* Copyright (c) 2008-2013, Ruby FFI project contributors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Ruby FFI project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MSC_VER
#include <sys/param.h>
#endif
#include <sys/types.h>
#ifndef _WIN32
# include <sys/mman.h>
# include <unistd.h>
#endif
#include <stdio.h>
#ifndef _MSC_VER
# include <stdint.h>
# include <stdbool.h>
#else
# include "win32/stdbool.h"
# if !defined(INT8_MIN)
# include "win32/stdint.h"
# endif
#endif
#include <ruby.h>
#if defined(HAVE_RUBY_THREAD_H)
#include <ruby/thread.h>
#endif
#include <ffi.h>
#if defined(HAVE_NATIVETHREAD) && !defined(_WIN32)
#include <pthread.h>
#endif
#include <fcntl.h>
#include "rbffi.h"
#include "compat.h"
#include "AbstractMemory.h"
#include "Pointer.h"
#include "Struct.h"
#include "Platform.h"
#include "Type.h"
#include "LastError.h"
#include "Call.h"
#include "ClosurePool.h"
#include "MappedType.h"
#include "Thread.h"
#include "LongDouble.h"
#include "MethodHandle.h"
#include "Function.h"
typedef struct Function_ {
Pointer base;
FunctionType* info;
MethodHandle* methodHandle;
bool autorelease;
Closure* closure;
VALUE rbProc;
VALUE rbFunctionInfo;
} Function;
static void function_mark(Function *);
static void function_free(Function *);
static VALUE function_init(VALUE self, VALUE rbFunctionInfo, VALUE rbProc);
static void callback_invoke(ffi_cif* cif, void* retval, void** parameters, void* user_data);
static bool callback_prep(void* ctx, void* code, Closure* closure, char* errmsg, size_t errmsgsize);
static void* callback_with_gvl(void* data);
static VALUE invoke_callback(void* data);
static VALUE save_callback_exception(void* data, VALUE exc);
#define DEFER_ASYNC_CALLBACK 1
#if defined(DEFER_ASYNC_CALLBACK)
static VALUE async_cb_event(void *);
static VALUE async_cb_call(void *);
#endif
#ifdef HAVE_RB_THREAD_CALL_WITH_GVL
extern void *rb_thread_call_with_gvl(void *(*func)(void *), void *data1);
#endif
VALUE rbffi_FunctionClass = Qnil;
#if defined(DEFER_ASYNC_CALLBACK)
static VALUE async_cb_thread = Qnil;
#endif
static ID id_call = 0, id_to_native = 0, id_from_native = 0, id_cbtable = 0, id_cb_ref = 0;
struct gvl_callback {
Closure* closure;
void* retval;
void** parameters;
bool done;
rbffi_frame_t *frame;
#if defined(DEFER_ASYNC_CALLBACK)
struct gvl_callback* next;
# ifndef _WIN32
pthread_cond_t async_cond;
pthread_mutex_t async_mutex;
# else
HANDLE async_event;
# endif
#endif
};
#if defined(DEFER_ASYNC_CALLBACK)
static struct gvl_callback* async_cb_list = NULL;
# ifndef _WIN32
static pthread_mutex_t async_cb_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t async_cb_cond = PTHREAD_COND_INITIALIZER;
# if !(defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL))
static int async_cb_pipe[2];
# endif
# else
static HANDLE async_cb_cond;
static CRITICAL_SECTION async_cb_lock;
# if !(defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL))
static int async_cb_pipe[2];
# endif
# endif
#endif
static VALUE
function_allocate(VALUE klass)
{
Function *fn;
VALUE obj;
obj = Data_Make_Struct(klass, Function, function_mark, function_free, fn);
fn->base.memory.flags = MEM_RD;
fn->base.rbParent = Qnil;
fn->rbProc = Qnil;
fn->rbFunctionInfo = Qnil;
fn->autorelease = true;
return obj;
}
static void
function_mark(Function *fn)
{
rb_gc_mark(fn->base.rbParent);
rb_gc_mark(fn->rbProc);
rb_gc_mark(fn->rbFunctionInfo);
}
static void
function_free(Function *fn)
{
if (fn->methodHandle != NULL) {
rbffi_MethodHandle_Free(fn->methodHandle);
}
if (fn->closure != NULL && fn->autorelease) {
rbffi_Closure_Free(fn->closure);
}
xfree(fn);
}
/*
* @param [Type, Symbol] return_type return type for the function
* @param [Array<Type, Symbol>] param_types array of parameters types
* @param [Hash] options see {FFI::FunctionType} for available options
* @return [self]
* A new Function instance.
*
* Define a function from a Proc or a block.
*
* @overload initialize(return_type, param_types, options = {}) { |i| ... }
* @yieldparam i parameters for the function
* @overload initialize(return_type, param_types, proc, options = {})
* @param [Proc] proc
*/
static VALUE
function_initialize(int argc, VALUE* argv, VALUE self)
{
VALUE rbReturnType = Qnil, rbParamTypes = Qnil, rbProc = Qnil, rbOptions = Qnil;
VALUE rbFunctionInfo = Qnil;
VALUE infoArgv[3];
int nargs;
nargs = rb_scan_args(argc, argv, "22", &rbReturnType, &rbParamTypes, &rbProc, &rbOptions);
/*
* Callback with block,
* e.g. Function.new(:int, [ :int ]) { |i| blah }
* or Function.new(:int, [ :int ], { :convention => :stdcall }) { |i| blah }
*/
if (rb_block_given_p()) {
if (nargs > 3) {
rb_raise(rb_eArgError, "cannot create function with both proc/address and block");
}
rbOptions = rbProc;
rbProc = rb_block_proc();
} else {
/* Callback with proc, or Function with address
* e.g. Function.new(:int, [ :int ], Proc.new { |i| })
* Function.new(:int, [ :int ], Proc.new { |i| }, { :convention => :stdcall })
* Function.new(:int, [ :int ], addr)
* Function.new(:int, [ :int ], addr, { :convention => :stdcall })
*/
}
infoArgv[0] = rbReturnType;
infoArgv[1] = rbParamTypes;
infoArgv[2] = rbOptions;
rbFunctionInfo = rb_class_new_instance(rbOptions != Qnil ? 3 : 2, infoArgv, rbffi_FunctionTypeClass);
function_init(self, rbFunctionInfo, rbProc);
return self;
}
/*
* call-seq: initialize_copy(other)
* @return [nil]
* DO NOT CALL THIS METHOD
*/
static VALUE
function_initialize_copy(VALUE self, VALUE other)
{
rb_raise(rb_eRuntimeError, "cannot duplicate function instances");
return Qnil;
}
VALUE
rbffi_Function_NewInstance(VALUE rbFunctionInfo, VALUE rbProc)
{
return function_init(function_allocate(rbffi_FunctionClass), rbFunctionInfo, rbProc);
}
VALUE
rbffi_Function_ForProc(VALUE rbFunctionInfo, VALUE proc)
{
VALUE callback, cbref, cbTable;
Function* fp;
cbref = RTEST(rb_ivar_defined(proc, id_cb_ref)) ? rb_ivar_get(proc, id_cb_ref) : Qnil;
/* If the first callback reference has the same function function signature, use it */
if (cbref != Qnil && CLASS_OF(cbref) == rbffi_FunctionClass) {
Data_Get_Struct(cbref, Function, fp);
if (fp->rbFunctionInfo == rbFunctionInfo) {
return cbref;
}
}
cbTable = RTEST(rb_ivar_defined(proc, id_cbtable)) ? rb_ivar_get(proc, id_cbtable) : Qnil;
if (cbTable != Qnil && (callback = rb_hash_aref(cbTable, rbFunctionInfo)) != Qnil) {
return callback;
}
/* No existing function for the proc with that signature, create a new one and cache it */
callback = rbffi_Function_NewInstance(rbFunctionInfo, proc);
if (cbref == Qnil) {
/* If there is no other cb already cached for this proc, we can use the ivar slot */
rb_ivar_set(proc, id_cb_ref, callback);
} else {
/* The proc instance has been used as more than one type of callback, store extras in a hash */
cbTable = rb_hash_new();
rb_ivar_set(proc, id_cbtable, cbTable);
rb_hash_aset(cbTable, rbFunctionInfo, callback);
}
return callback;
}
static VALUE
function_init(VALUE self, VALUE rbFunctionInfo, VALUE rbProc)
{
Function* fn = NULL;
Data_Get_Struct(self, Function, fn);
fn->rbFunctionInfo = rbFunctionInfo;
Data_Get_Struct(fn->rbFunctionInfo, FunctionType, fn->info);
if (rb_obj_is_kind_of(rbProc, rbffi_PointerClass)) {
Pointer* orig;
Data_Get_Struct(rbProc, Pointer, orig);
fn->base.memory = orig->memory;
fn->base.rbParent = rbProc;
} else if (rb_obj_is_kind_of(rbProc, rb_cProc) || rb_respond_to(rbProc, id_call)) {
if (fn->info->closurePool == NULL) {
fn->info->closurePool = rbffi_ClosurePool_New(sizeof(ffi_closure), callback_prep, fn->info);
if (fn->info->closurePool == NULL) {
rb_raise(rb_eNoMemError, "failed to create closure pool");
}
}
#if defined(DEFER_ASYNC_CALLBACK)
if (async_cb_thread == Qnil) {
#if !(defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL)) && defined(_WIN32)
_pipe(async_cb_pipe, 1024, O_BINARY);
#elif !(defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL))
pipe(async_cb_pipe);
fcntl(async_cb_pipe[0], F_SETFL, fcntl(async_cb_pipe[0], F_GETFL) | O_NONBLOCK);
fcntl(async_cb_pipe[1], F_SETFL, fcntl(async_cb_pipe[1], F_GETFL) | O_NONBLOCK);
#endif
async_cb_thread = rb_thread_create(async_cb_event, NULL);
}
#endif
fn->closure = rbffi_Closure_Alloc(fn->info->closurePool);
fn->closure->info = fn;
fn->base.memory.address = fn->closure->code;
fn->base.memory.size = sizeof(*fn->closure);
fn->autorelease = true;
} else {
rb_raise(rb_eTypeError, "wrong argument type %s, expected pointer or proc",
rb_obj_classname(rbProc));
}
fn->rbProc = rbProc;
return self;
}
/*
* call-seq: call(*args)
* @param [Array] args function arguments
* @return [FFI::Type]
* Call the function
*/
static VALUE
function_call(int argc, VALUE* argv, VALUE self)
{
Function* fn;
Data_Get_Struct(self, Function, fn);
return (*fn->info->invoke)(argc, argv, fn->base.memory.address, fn->info);
}
/*
* call-seq: attach(m, name)
* @param [Module] m
* @param [String] name
* @return [self]
* Attach a Function to the Module +m+ as +name+.
*/
static VALUE
function_attach(VALUE self, VALUE module, VALUE name)
{
Function* fn;
char var[1024];
Data_Get_Struct(self, Function, fn);
if (fn->info->parameterCount == -1) {
rb_raise(rb_eRuntimeError, "cannot attach variadic functions");
return Qnil;
}
if (!rb_obj_is_kind_of(module, rb_cModule)) {
rb_raise(rb_eRuntimeError, "trying to attach function to non-module");
return Qnil;
}
if (fn->methodHandle == NULL) {
fn->methodHandle = rbffi_MethodHandle_Alloc(fn->info, fn->base.memory.address);
}
/*
* Stash the Function in a module variable so it does not get garbage collected
*/
snprintf(var, sizeof(var), "@@%s", StringValueCStr(name));
rb_cv_set(module, var, self);
rb_define_singleton_method(module, StringValueCStr(name),
rbffi_MethodHandle_CodeAddress(fn->methodHandle), -1);
rb_define_method(module, StringValueCStr(name),
rbffi_MethodHandle_CodeAddress(fn->methodHandle), -1);
return self;
}
/*
* call-seq: autorelease = autorelease
* @param [Boolean] autorelease
* @return [self]
* Set +autorelease+ attribute (See {Pointer}).
*/
static VALUE
function_set_autorelease(VALUE self, VALUE autorelease)
{
Function* fn;
Data_Get_Struct(self, Function, fn);
fn->autorelease = RTEST(autorelease);
return self;
}
static VALUE
function_autorelease_p(VALUE self)
{
Function* fn;
Data_Get_Struct(self, Function, fn);
return fn->autorelease ? Qtrue : Qfalse;
}
/*
* call-seq: free
* @return [self]
* Free memory allocated by Function.
*/
static VALUE
function_release(VALUE self)
{
Function* fn;
Data_Get_Struct(self, Function, fn);
if (fn->closure == NULL) {
rb_raise(rb_eRuntimeError, "cannot free function which was not allocated");
}
rbffi_Closure_Free(fn->closure);
fn->closure = NULL;
return self;
}
static void
callback_invoke(ffi_cif* cif, void* retval, void** parameters, void* user_data)
{
struct gvl_callback cb = { 0 };
cb.closure = (Closure *) user_data;
cb.retval = retval;
cb.parameters = parameters;
cb.done = false;
cb.frame = rbffi_frame_current();
if (cb.frame != NULL) cb.frame->exc = Qnil;
if (cb.frame != NULL && cb.frame->has_gvl) {
callback_with_gvl(&cb);
#if defined(HAVE_RB_THREAD_CALL_WITH_GVL)
} else if (cb.frame != NULL) {
rb_thread_call_with_gvl(callback_with_gvl, &cb);
#endif
#if defined(DEFER_ASYNC_CALLBACK) && !defined(_WIN32)
} else {
bool empty = false;
pthread_mutex_init(&cb.async_mutex, NULL);
pthread_cond_init(&cb.async_cond, NULL);
/* Now signal the async callback thread */
pthread_mutex_lock(&async_cb_mutex);
empty = async_cb_list == NULL;
cb.next = async_cb_list;
async_cb_list = &cb;
#if !(defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL))
pthread_mutex_unlock(&async_cb_mutex);
/* Only signal if the list was empty */
if (empty) {
char c;
write(async_cb_pipe[1], &c, 1);
}
#else
pthread_cond_signal(&async_cb_cond);
pthread_mutex_unlock(&async_cb_mutex);
#endif
/* Wait for the thread executing the ruby callback to signal it is done */
pthread_mutex_lock(&cb.async_mutex);
while (!cb.done) {
pthread_cond_wait(&cb.async_cond, &cb.async_mutex);
}
pthread_mutex_unlock(&cb.async_mutex);
pthread_cond_destroy(&cb.async_cond);
pthread_mutex_destroy(&cb.async_mutex);
#elif defined(DEFER_ASYNC_CALLBACK) && defined(_WIN32)
} else {
bool empty = false;
cb.async_event = CreateEvent(NULL, FALSE, FALSE, NULL);
/* Now signal the async callback thread */
EnterCriticalSection(&async_cb_lock);
empty = async_cb_list == NULL;
cb.next = async_cb_list;
async_cb_list = &cb;
LeaveCriticalSection(&async_cb_lock);
#if !(defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL))
/* Only signal if the list was empty */
if (empty) {
char c;
write(async_cb_pipe[1], &c, 1);
}
#else
SetEvent(async_cb_cond);
#endif
/* Wait for the thread executing the ruby callback to signal it is done */
WaitForSingleObject(cb.async_event, INFINITE);
CloseHandle(cb.async_event);
#endif
}
}
#if defined(DEFER_ASYNC_CALLBACK)
struct async_wait {
void* cb;
bool stop;
};
static void * async_cb_wait(void *);
static void async_cb_stop(void *);
#if defined(HAVE_RB_THREAD_BLOCKING_REGION) || defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL)
static VALUE
async_cb_event(void* unused)
{
struct async_wait w = { 0 };
w.stop = false;
while (!w.stop) {
#if defined(HAVE_RB_THREAD_CALL_WITHOUT_GVL)
rb_thread_call_without_gvl(async_cb_wait, &w, async_cb_stop, &w);
#else
rb_thread_blocking_region(async_cb_wait, &w, async_cb_stop, &w);
#endif
if (w.cb != NULL) {
/* Start up a new ruby thread to run the ruby callback */
rb_thread_create(async_cb_call, w.cb);
}
}
return Qnil;
}
#elif defined(_WIN32)
static VALUE
async_cb_event(void* unused)
{
while (true) {
struct gvl_callback* cb;
char buf[64];
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(async_cb_pipe[0], &rfds);
rb_thread_select(async_cb_pipe[0] + 1, &rfds, NULL, NULL, NULL);
read(async_cb_pipe[0], buf, sizeof(buf));
EnterCriticalSection(&async_cb_lock);
cb = async_cb_list;
async_cb_list = NULL;
LeaveCriticalSection(&async_cb_lock);
while (cb != NULL) {
struct gvl_callback* next = cb->next;
/* Start up a new ruby thread to run the ruby callback */
rb_thread_create(async_cb_call, cb);
cb = next;
}
}
return Qnil;
}
#else
static VALUE
async_cb_event(void* unused)
{
while (true) {
struct gvl_callback* cb;
char buf[64];
if (read(async_cb_pipe[0], buf, sizeof(buf)) < 0) {
rb_thread_wait_fd(async_cb_pipe[0]);
while (read(async_cb_pipe[0], buf, sizeof (buf)) < 0) {
if (rb_io_wait_readable(async_cb_pipe[0]) != Qtrue) {
return Qfalse;
}
}
}
pthread_mutex_lock(&async_cb_mutex);
cb = async_cb_list;
async_cb_list = NULL;
pthread_mutex_unlock(&async_cb_mutex);
while (cb != NULL) {
struct gvl_callback* next = cb->next;
/* Start up a new ruby thread to run the ruby callback */
rb_thread_create(async_cb_call, cb);
cb = next;
}
}
return Qnil;
}
#endif
#ifdef _WIN32
static void *
async_cb_wait(void *data)
{
struct async_wait* w = (struct async_wait *) data;
w->cb = NULL;
EnterCriticalSection(&async_cb_lock);
while (!w->stop && async_cb_list == NULL) {
LeaveCriticalSection(&async_cb_lock);
WaitForSingleObject(async_cb_cond, INFINITE);
EnterCriticalSection(&async_cb_lock);
}
if (async_cb_list != NULL) {
w->cb = async_cb_list;
async_cb_list = async_cb_list->next;
}
LeaveCriticalSection(&async_cb_lock);
return NULL;
}
static void
async_cb_stop(void *data)
{
struct async_wait* w = (struct async_wait *) data;
EnterCriticalSection(&async_cb_lock);
w->stop = true;
LeaveCriticalSection(&async_cb_lock);
SetEvent(async_cb_cond);
}
#else
static void *
async_cb_wait(void *data)
{
struct async_wait* w = (struct async_wait *) data;
w->cb = NULL;
pthread_mutex_lock(&async_cb_mutex);
while (!w->stop && async_cb_list == NULL) {
pthread_cond_wait(&async_cb_cond, &async_cb_mutex);
}
if (async_cb_list != NULL) {
w->cb = async_cb_list;
async_cb_list = async_cb_list->next;
}
pthread_mutex_unlock(&async_cb_mutex);
return NULL;
}
static void
async_cb_stop(void *data)
{
struct async_wait* w = (struct async_wait *) data;
pthread_mutex_lock(&async_cb_mutex);
w->stop = true;
pthread_cond_signal(&async_cb_cond);
pthread_mutex_unlock(&async_cb_mutex);
}
#endif
static VALUE
async_cb_call(void *data)
{
struct gvl_callback* cb = (struct gvl_callback *) data;
callback_with_gvl(data);
/* Signal the original native thread that the ruby code has completed */
#ifdef _WIN32
SetEvent(cb->async_event);
#else
pthread_mutex_lock(&cb->async_mutex);
cb->done = true;
pthread_cond_signal(&cb->async_cond);
pthread_mutex_unlock(&cb->async_mutex);
#endif
return Qnil;
}
#endif
static void *
callback_with_gvl(void* data)
{
rb_rescue2(invoke_callback, (VALUE) data, save_callback_exception, (VALUE) data, rb_eException, (VALUE) 0);
return NULL;
}
static VALUE
invoke_callback(void* data)
{
struct gvl_callback* cb = (struct gvl_callback *) data;
Function* fn = (Function *) cb->closure->info;
FunctionType *cbInfo = fn->info;
Type* returnType = cbInfo->returnType;
void* retval = cb->retval;
void** parameters = cb->parameters;
VALUE* rbParams;
VALUE rbReturnType = cbInfo->rbReturnType;
VALUE rbReturnValue;
int i;
rbParams = ALLOCA_N(VALUE, cbInfo->parameterCount);
for (i = 0; i < cbInfo->parameterCount; ++i) {
VALUE param;
Type* paramType = cbInfo->parameterTypes[i];
VALUE rbParamType = rb_ary_entry(cbInfo->rbParameterTypes, i);
if (unlikely(paramType->nativeType == NATIVE_MAPPED)) {
rbParamType = ((MappedType *) paramType)->rbType;
paramType = ((MappedType *) paramType)->type;
}
switch (paramType->nativeType) {
case NATIVE_INT8:
param = INT2NUM(*(int8_t *) parameters[i]);
break;
case NATIVE_UINT8:
param = UINT2NUM(*(uint8_t *) parameters[i]);
break;
case NATIVE_INT16:
param = INT2NUM(*(int16_t *) parameters[i]);
break;
case NATIVE_UINT16:
param = UINT2NUM(*(uint16_t *) parameters[i]);
break;
case NATIVE_INT32:
param = INT2NUM(*(int32_t *) parameters[i]);
break;
case NATIVE_UINT32:
param = UINT2NUM(*(uint32_t *) parameters[i]);
break;
case NATIVE_INT64:
param = LL2NUM(*(int64_t *) parameters[i]);
break;
case NATIVE_UINT64:
param = ULL2NUM(*(uint64_t *) parameters[i]);
break;
case NATIVE_LONG:
param = LONG2NUM(*(long *) parameters[i]);
break;
case NATIVE_ULONG:
param = ULONG2NUM(*(unsigned long *) parameters[i]);
break;
case NATIVE_FLOAT32:
param = rb_float_new(*(float *) parameters[i]);
break;
case NATIVE_FLOAT64:
param = rb_float_new(*(double *) parameters[i]);
break;
case NATIVE_LONGDOUBLE:
param = rbffi_longdouble_new(*(long double *) parameters[i]);
break;
case NATIVE_STRING:
param = (*(void **) parameters[i] != NULL) ? rb_tainted_str_new2(*(char **) parameters[i]) : Qnil;
break;
case NATIVE_POINTER:
param = rbffi_Pointer_NewInstance(*(void **) parameters[i]);
break;
case NATIVE_BOOL:
param = (*(uint8_t *) parameters[i]) ? Qtrue : Qfalse;
break;
case NATIVE_FUNCTION:
case NATIVE_CALLBACK:
case NATIVE_STRUCT:
param = rbffi_NativeValue_ToRuby(paramType, rbParamType, parameters[i]);
break;
default:
param = Qnil;
break;
}
/* Convert the native value into a custom ruby value */
if (unlikely(cbInfo->parameterTypes[i]->nativeType == NATIVE_MAPPED)) {
VALUE values[] = { param, Qnil };
param = rb_funcall2(((MappedType *) cbInfo->parameterTypes[i])->rbConverter, id_from_native, 2, values);
}
rbParams[i] = param;
}
rbReturnValue = rb_funcall2(fn->rbProc, id_call, cbInfo->parameterCount, rbParams);
if (unlikely(returnType->nativeType == NATIVE_MAPPED)) {
VALUE values[] = { rbReturnValue, Qnil };
rbReturnValue = rb_funcall2(((MappedType *) returnType)->rbConverter, id_to_native, 2, values);
rbReturnType = ((MappedType *) returnType)->rbType;
returnType = ((MappedType* ) returnType)->type;
}
if (rbReturnValue == Qnil || TYPE(rbReturnValue) == T_NIL) {
memset(retval, 0, returnType->ffiType->size);
} else switch (returnType->nativeType) {
case NATIVE_INT8:
case NATIVE_INT16:
case NATIVE_INT32:
*((ffi_sarg *) retval) = NUM2INT(rbReturnValue);
break;
case NATIVE_UINT8:
case NATIVE_UINT16:
case NATIVE_UINT32:
*((ffi_arg *) retval) = NUM2UINT(rbReturnValue);
break;
case NATIVE_INT64:
*((int64_t *) retval) = NUM2LL(rbReturnValue);
break;
case NATIVE_UINT64:
*((uint64_t *) retval) = NUM2ULL(rbReturnValue);
break;
case NATIVE_LONG:
*((ffi_sarg *) retval) = NUM2LONG(rbReturnValue);
break;
case NATIVE_ULONG:
*((ffi_arg *) retval) = NUM2ULONG(rbReturnValue);
break;
case NATIVE_FLOAT32:
*((float *) retval) = (float) NUM2DBL(rbReturnValue);
break;
case NATIVE_FLOAT64:
*((double *) retval) = NUM2DBL(rbReturnValue);
break;
case NATIVE_POINTER:
if (TYPE(rbReturnValue) == T_DATA && rb_obj_is_kind_of(rbReturnValue, rbffi_PointerClass)) {
*((void **) retval) = ((AbstractMemory *) DATA_PTR(rbReturnValue))->address;
} else {
/* Default to returning NULL if not a value pointer object. handles nil case as well */
*((void **) retval) = NULL;
}
break;
case NATIVE_BOOL:
*((ffi_arg *) retval) = rbReturnValue == Qtrue;
break;
case NATIVE_FUNCTION:
case NATIVE_CALLBACK:
if (TYPE(rbReturnValue) == T_DATA && rb_obj_is_kind_of(rbReturnValue, rbffi_PointerClass)) {
*((void **) retval) = ((AbstractMemory *) DATA_PTR(rbReturnValue))->address;
} else if (rb_obj_is_kind_of(rbReturnValue, rb_cProc) || rb_respond_to(rbReturnValue, id_call)) {
VALUE function;
function = rbffi_Function_ForProc(rbReturnType, rbReturnValue);
*((void **) retval) = ((AbstractMemory *) DATA_PTR(function))->address;
} else {
*((void **) retval) = NULL;
}
break;
case NATIVE_STRUCT:
if (TYPE(rbReturnValue) == T_DATA && rb_obj_is_kind_of(rbReturnValue, rbffi_StructClass)) {
AbstractMemory* memory = ((Struct *) DATA_PTR(rbReturnValue))->pointer;
if (memory->address != NULL) {
memcpy(retval, memory->address, returnType->ffiType->size);
} else {
memset(retval, 0, returnType->ffiType->size);
}
} else {
memset(retval, 0, returnType->ffiType->size);
}
break;
default:
*((ffi_arg *) retval) = 0;
break;
}
return Qnil;
}
static VALUE
save_callback_exception(void* data, VALUE exc)
{
struct gvl_callback* cb = (struct gvl_callback *) data;
memset(cb->retval, 0, ((Function *) cb->closure->info)->info->returnType->ffiType->size);
if (cb->frame != NULL) cb->frame->exc = exc;
return Qnil;
}
static bool
callback_prep(void* ctx, void* code, Closure* closure, char* errmsg, size_t errmsgsize)
{
FunctionType* fnInfo = (FunctionType *) ctx;
ffi_status ffiStatus;
ffiStatus = ffi_prep_closure(code, &fnInfo->ffi_cif, callback_invoke, closure);
if (ffiStatus != FFI_OK) {
snprintf(errmsg, errmsgsize, "ffi_prep_closure failed. status=%#x", ffiStatus);
return false;
}
return true;
}
void
rbffi_Function_Init(VALUE moduleFFI)
{
rbffi_FunctionInfo_Init(moduleFFI);
/*
* Document-class: FFI::Function < FFI::Pointer
*/
rbffi_FunctionClass = rb_define_class_under(moduleFFI, "Function", rbffi_PointerClass);
rb_global_variable(&rbffi_FunctionClass);
rb_define_alloc_func(rbffi_FunctionClass, function_allocate);
rb_define_method(rbffi_FunctionClass, "initialize", function_initialize, -1);
rb_define_method(rbffi_FunctionClass, "initialize_copy", function_initialize_copy, 1);
rb_define_method(rbffi_FunctionClass, "call", function_call, -1);
rb_define_method(rbffi_FunctionClass, "attach", function_attach, 2);
rb_define_method(rbffi_FunctionClass, "free", function_release, 0);
rb_define_method(rbffi_FunctionClass, "autorelease=", function_set_autorelease, 1);
/*
* call-seq: autorelease
* @return [Boolean]
* Get +autorelease+ attribute.
* Synonymous for {#autorelease?}.
*/
rb_define_method(rbffi_FunctionClass, "autorelease", function_autorelease_p, 0);
/*
* call-seq: autorelease?
* @return [Boolean] +autorelease+ attribute
* Get +autorelease+ attribute.
*/
rb_define_method(rbffi_FunctionClass, "autorelease?", function_autorelease_p, 0);
id_call = rb_intern("call");
id_cbtable = rb_intern("@__ffi_callback_table__");
id_cb_ref = rb_intern("@__ffi_callback__");
id_to_native = rb_intern("to_native");
id_from_native = rb_intern("from_native");
#if defined(_WIN32)
InitializeCriticalSection(&async_cb_lock);
async_cb_cond = CreateEvent(NULL, FALSE, FALSE, NULL);
#endif
}