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#
# This file is part of ruby-ffi.
# For licensing, see LICENSE.SPECS
#
require File.expand_path(File.join(File.dirname(__FILE__), "spec_helper"))
require 'delegate'
module PointerTestLib
extend FFI::Library
ffi_lib TestLibrary::PATH
begin
attach_function :ptr_ret_int32_t, [ :pointer, :int ], :int
rescue FFI::NotFoundError
# NetBSD uses #define instead of typedef for these
attach_function :ptr_ret_int32_t, :ptr_ret___int32_t, [ :pointer, :int ], :int
end
attach_function :ptr_from_address, [ FFI::Platform::ADDRESS_SIZE == 32 ? :uint : :ulong_long ], :pointer
attach_function :ptr_set_pointer, [ :pointer, :int, :pointer ], :void
attach_function :ptr_ret_pointer, [ :pointer, :int ], :pointer
end
describe "Pointer" do
include FFI
class ToPtrTest
def initialize(ptr)
@ptr = ptr
end
def to_ptr
@ptr
end
end
it "Any object implementing #to_ptr can be passed as a :pointer parameter" do
memory = FFI::MemoryPointer.new :long_long
magic = 0x12345678
memory.put_int32(0, magic)
tp = ToPtrTest.new(memory)
expect(PointerTestLib.ptr_ret_int32_t(tp, 0)).to eq(magic)
end
class PointerDelegate < DelegateClass(FFI::Pointer)
def initialize(ptr)
@ptr = ptr
end
def to_ptr
@ptr
end
end
it "A DelegateClass(Pointer) can be passed as a :pointer parameter" do
memory = FFI::MemoryPointer.new :long_long
magic = 0x12345678
memory.put_int32(0, magic)
ptr = PointerDelegate.new(memory)
expect(PointerTestLib.ptr_ret_int32_t(ptr, 0)).to eq(magic)
end
it "Fixnum cannot be used as a Pointer argument" do
expect { PointerTestLib.ptr_ret_int32(0, 0) }.to raise_error
end
it "Bignum cannot be used as a Pointer argument" do
expect { PointerTestLib.ptr_ret_int32(0xfee1deadbeefcafebabe, 0) }.to raise_error
end
describe "pointer type methods" do
it "#read_pointer" do
memory = FFI::MemoryPointer.new :pointer
PointerTestLib.ptr_set_pointer(memory, 0, PointerTestLib.ptr_from_address(0xdeadbeef))
expect(memory.read_pointer.address).to eq(0xdeadbeef)
end
it "#write_pointer" do
memory = FFI::MemoryPointer.new :pointer
memory.write_pointer(PointerTestLib.ptr_from_address(0xdeadbeef))
expect(PointerTestLib.ptr_ret_pointer(memory, 0).address).to eq(0xdeadbeef)
end
it "#read_array_of_pointer" do
values = [0x12345678, 0xfeedf00d, 0xdeadbeef]
memory = FFI::MemoryPointer.new :pointer, values.size
values.each_with_index do |address, j|
PointerTestLib.ptr_set_pointer(memory, j * FFI.type_size(:pointer), PointerTestLib.ptr_from_address(address))
end
array = memory.read_array_of_pointer(values.size)
values.each_with_index do |address, j|
expect(array[j].address).to eq(address)
end
end
end
describe 'NULL' do
it 'should be obtained using Pointer::NULL constant' do
null_ptr = FFI::Pointer::NULL
expect(null_ptr).to be_null
end
it 'should be obtained passing address 0 to constructor' do
expect(FFI::Pointer.new(0)).to be_null
end
it 'should raise an error when attempting read/write operations on it' do
null_ptr = FFI::Pointer::NULL
expect { null_ptr.read_int }.to raise_error(FFI::NullPointerError)
expect { null_ptr.write_int(0xff1) }.to raise_error(FFI::NullPointerError)
end
it 'returns true when compared with nil' do
expect((FFI::Pointer::NULL == nil)).to be true
end
end
it "Pointer.size returns sizeof pointer on platform" do
expect(FFI::Pointer.size).to eq((FFI::Platform::ADDRESS_SIZE / 8))
end
describe "#slice" do
before(:each) do
@mptr = FFI::MemoryPointer.new(:char, 12)
@mptr.put_uint(0, 0x12345678)
@mptr.put_uint(4, 0xdeadbeef)
end
it "contents of sliced pointer matches original pointer at offset" do
expect(@mptr.slice(4, 4).get_uint(0)).to eq(0xdeadbeef)
end
it "modifying sliced pointer is reflected in original pointer" do
@mptr.slice(4, 4).put_uint(0, 0xfee1dead)
expect(@mptr.get_uint(4)).to eq(0xfee1dead)
end
it "access beyond bounds should raise IndexError" do
expect { @mptr.slice(4, 4).get_int(4) }.to raise_error(IndexError)
end
end
describe "#type_size" do
it "should be same as FFI.type_size(type)" do
expect(FFI::MemoryPointer.new(:int, 1).type_size).to eq(FFI.type_size(:int))
end
end
end
describe "AutoPointer" do
loop_count = 30
wiggle_room = 5 # GC rarely cleans up all objects. we can get most of them, and that's enough to determine if the basic functionality is working.
magic = 0x12345678
class AutoPointerTestHelper
@@count = 0
def self.release
@@count += 1 if @@count > 0
end
def self.reset
@@count = 0
end
def self.gc_everything(count)
loop = 5
while @@count < count && loop > 0
loop -= 1
TestLibrary.force_gc
sleep 0.05 unless @@count == count
end
@@count = 0
end
def self.finalizer
self.method(:release).to_proc
end
end
class AutoPointerSubclass < FFI::AutoPointer
def self.release(ptr); end
end
it "cleanup via default release method" do
expect(AutoPointerSubclass).to receive(:release).at_least(loop_count-wiggle_room).times
AutoPointerTestHelper.reset
loop_count.times do
# note that if we called
# AutoPointerTestHelper.method(:release).to_proc inline, we'd
# have a reference to the pointer and it would never get GC'd.
AutoPointerSubclass.new(PointerTestLib.ptr_from_address(magic))
end
AutoPointerTestHelper.gc_everything loop_count
end
it "cleanup when passed a proc" do
# NOTE: passing a proc is touchy, because it's so easy to create a memory leak.
#
# specifically, if we made an inline call to
#
# AutoPointerTestHelper.method(:release).to_proc
#
# we'd have a reference to the pointer and it would
# never get GC'd.
expect(AutoPointerTestHelper).to receive(:release).at_least(loop_count-wiggle_room).times
AutoPointerTestHelper.reset
loop_count.times do
FFI::AutoPointer.new(PointerTestLib.ptr_from_address(magic),
AutoPointerTestHelper.finalizer)
end
AutoPointerTestHelper.gc_everything loop_count
end
it "cleanup when passed a method" do
expect(AutoPointerTestHelper).to receive(:release).at_least(loop_count-wiggle_room).times
AutoPointerTestHelper.reset
loop_count.times do
FFI::AutoPointer.new(PointerTestLib.ptr_from_address(magic),
AutoPointerTestHelper.method(:release))
end
AutoPointerTestHelper.gc_everything loop_count
end
it "can be used as the return type of a function" do
expect do
Module.new do
extend FFI::Library
ffi_lib TestLibrary::PATH
class CustomAutoPointer < FFI::AutoPointer
def self.release(ptr); end
end
attach_function :ptr_from_address, [ FFI::Platform::ADDRESS_SIZE == 32 ? :uint : :ulong_long ], CustomAutoPointer
end
end.not_to raise_error
end
describe "#new" do
it "MemoryPointer argument raises TypeError" do
expect { FFI::AutoPointer.new(FFI::MemoryPointer.new(:int))}.to raise_error(::TypeError)
end
it "AutoPointer argument raises TypeError" do
expect { AutoPointerSubclass.new(AutoPointerSubclass.new(PointerTestLib.ptr_from_address(0))) }.to raise_error(::TypeError)
end
it "Buffer argument raises TypeError" do
expect { FFI::AutoPointer.new(FFI::Buffer.new(:int))}.to raise_error(::TypeError)
end
end
describe "#autorelease?" do
ptr_class = Class.new(FFI::AutoPointer) do
def self.release(ptr); end
end
it "should be true by default" do
expect(ptr_class.new(FFI::Pointer.new(0xdeadbeef)).autorelease?).to be true
end
it "should return false when autorelease=(false)" do
ptr = ptr_class.new(FFI::Pointer.new(0xdeadbeef))
ptr.autorelease = false
expect(ptr.autorelease?).to be false
end
end
describe "#type_size" do
ptr_class = Class.new(FFI::AutoPointer) do
def self.release(ptr); end
end
it "type_size of AutoPointer should match wrapped Pointer" do
aptr = ptr_class.new(FFI::Pointer.new(:int, 0xdeadbeef))
expect(aptr.type_size).to eq(FFI.type_size(:int))
end
it "[] offset should match wrapped Pointer" do
mptr = FFI::MemoryPointer.new(:int, 1024)
aptr = ptr_class.new(FFI::Pointer.new(:int, mptr))
aptr[0].write_uint(0xfee1dead)
aptr[1].write_uint(0xcafebabe)
expect(mptr[0].read_uint).to eq(0xfee1dead)
expect(mptr[1].read_uint).to eq(0xcafebabe)
end
end
end
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