Class: FFI::Function

Inherits:

Pointer

• Object
• AbstractMemoryClass
• Pointer
• FFI::Function

Defined in:

ext/ffi_c/Function.c

Constant Summary

Constants inherited from Pointer

Pointer::NULL, Pointer::SIZE

Instance Method Summary

• #attach(module, name) ⇒ Object
• #autorelease ⇒ Object
• #autorelease=(autorelease) ⇒ Object
• #autorelease? ⇒ Boolean
• #call(*args) ⇒ Object
• #free ⇒ Object
• #initialize(*args) ⇒ Object constructor

Methods inherited from Pointer

#+, #==, #address, #inspect, #null?, #read_array_of_int, #read_array_of_long, #read_array_of_pointer, #read_array_of_type, #read_float, #read_int, #read_long, #read_long_long, #read_pointer, #read_string, #read_string_length, #read_string_to_null, size, #slice, #write_array_of_int, #write_array_of_long, #write_array_of_pointer, #write_array_of_type, #write_float, #write_int, #write_long, #write_long_long, #write_pointer, #write_string, #write_string_length

Constructor Details

#initialize(*args) ⇒ Object

# File 'ext/ffi_c/Function.c', line 113

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;
}

Instance Method Details

#attach(module, name) ⇒ Object

# File 'ext/ffi_c/Function.c', line 243

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->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;
}

#autorelease ⇒ Object

# File 'ext/ffi_c/Function.c', line 293

static VALUE
function_autorelease_p(VALUE self)
{
    Function* fn;

    Data_Get_Struct(self, Function, fn);

    return fn->autorelease ? Qtrue : Qfalse;
}

#autorelease=(autorelease) ⇒ Object

# File 'ext/ffi_c/Function.c', line 281

static VALUE
function_set_autorelease(VALUE self, VALUE autorelease)
{
    Function* fn;

    Data_Get_Struct(self, Function, fn);

    fn->autorelease = RTEST(autorelease);

    return self;
}

#autorelease? ⇒ Boolean

Returns:

• (Boolean)

# File 'ext/ffi_c/Function.c', line 293

static VALUE
function_autorelease_p(VALUE self)
{
    Function* fn;

    Data_Get_Struct(self, Function, fn);

    return fn->autorelease ? Qtrue : Qfalse;
}

#call(*args) ⇒ Object

# File 'ext/ffi_c/Function.c', line 233

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->memory.address, fn->info);
}

#free ⇒ Object

# File 'ext/ffi_c/Function.c', line 303

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;
}