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org.jruby.ext.ffi.MemoryPointer Maven / Gradle / Ivy
package org.jruby.ext.ffi;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.RubyModule;
import org.jruby.RubyNumeric;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.exceptions.RaiseException;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import static org.jruby.runtime.Visibility.*;
@JRubyClass(name = "FFI::MemoryPointer", parent = "FFI::Pointer")
public final class MemoryPointer extends Pointer {
public static RubyClass createMemoryPointerClass(Ruby runtime, RubyModule module) {
RubyClass result = module.defineClassUnder("MemoryPointer",
module.fastGetClass("Pointer"),
MemoryPointerAllocator.INSTANCE);
result.defineAnnotatedMethods(MemoryPointer.class);
result.defineAnnotatedConstants(MemoryPointer.class);
return result;
}
private static final class MemoryPointerAllocator implements ObjectAllocator {
static final ObjectAllocator INSTANCE = new MemoryPointerAllocator();
public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
return new MemoryPointer(runtime, klazz);
}
}
private MemoryPointer(Ruby runtime, IRubyObject klass) {
super(runtime, (RubyClass) klass);
}
private MemoryPointer(Ruby runtime, IRubyObject klass, DirectMemoryIO io, long total, int typeSize) {
super(runtime, (RubyClass) klass, io, total, typeSize);
}
private final IRubyObject init(ThreadContext context, IRubyObject rbTypeSize, int count, int align, boolean clear, Block block) {
typeSize = calculateTypeSize(context, rbTypeSize);
size = typeSize * count;
if (size < 0) {
throw context.getRuntime().newArgumentError(String.format("Negative size (%d objects of %d size)", count, typeSize));
}
setMemoryIO(Factory.getInstance().allocateDirectMemory(context.getRuntime(),
size > 0 ? (int) size : 1, align, clear));
if (getMemoryIO() == null) {
Ruby runtime = context.getRuntime();
throw new RaiseException(runtime, runtime.getNoMemoryError(),
String.format("Failed to allocate %d objects of %d bytes", typeSize, count), true);
}
if (block.isGiven()) {
try {
return block.yield(context, this);
} finally {
((AllocatedDirectMemoryIO) getMemoryIO()).free();
setMemoryIO(new FreedMemoryIO(context.getRuntime()));
}
} else {
return this;
}
}
static final MemoryPointer allocate(Ruby runtime, int typeSize, int count, boolean clear) {
final int total = typeSize * count;
AllocatedDirectMemoryIO io = Factory.getInstance().allocateDirectMemory(runtime, total > 0 ? total : 1, clear);
if (io == null) {
throw new RaiseException(runtime, runtime.getNoMemoryError(),
String.format("Failed to allocate %d objects of %d bytes", typeSize, count), true);
}
return new MemoryPointer(runtime, runtime.fastGetModule("FFI").fastGetClass("MemoryPointer"), io, total, typeSize);
}
@JRubyMethod(name = { "initialize" }, visibility = PRIVATE)
public final IRubyObject initialize(ThreadContext context, IRubyObject sizeArg, Block block) {
return sizeArg instanceof RubyFixnum
? init(context, RubyFixnum.one(context.getRuntime()),
RubyFixnum.fix2int(sizeArg), 1, true, block)
: init(context, sizeArg, 1, 1, true, block);
}
@JRubyMethod(name = { "initialize" }, visibility = PRIVATE)
public final IRubyObject initialize(ThreadContext context, IRubyObject sizeArg, IRubyObject count, Block block) {
return init(context, sizeArg, RubyNumeric.fix2int(count), 1, true, block);
}
@JRubyMethod(name = { "initialize" }, visibility = PRIVATE)
public final IRubyObject initialize(ThreadContext context,
IRubyObject sizeArg, IRubyObject count, IRubyObject clear, Block block) {
return init(context, sizeArg, RubyNumeric.fix2int(count), 1, clear.isTrue(), block);
}
@Override
public final String toString() {
return String.format("MemoryPointer[address=%#x, size=%d]", getAddress(), size);
}
@JRubyMethod(name = "free")
public final IRubyObject free(ThreadContext context) {
((AllocatedDirectMemoryIO) getMemoryIO()).free();
// Replace memory object with one that throws an exception on any access
setMemoryIO(new FreedMemoryIO(context.getRuntime()));
return context.getRuntime().getNil();
}
@JRubyMethod(name = "autorelease=", required = 1)
public final IRubyObject autorelease(ThreadContext context, IRubyObject release) {
((AllocatedDirectMemoryIO) getMemoryIO()).setAutoRelease(release.isTrue());
return context.getRuntime().getNil();
}
}