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Unified Diff: third_party/go/src/golang.org/x/mobile/bind/java/Seq.java

Issue 1275153002: Remove third_party/golang.org/x/mobile as it is no longer used with Go 1.5. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Remove golang.org/x/mobile Created 5 years, 4 months ago
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Index: third_party/go/src/golang.org/x/mobile/bind/java/Seq.java
diff --git a/third_party/go/src/golang.org/x/mobile/bind/java/Seq.java b/third_party/go/src/golang.org/x/mobile/bind/java/Seq.java
deleted file mode 100644
index 516a8751d1043c1799c98103ae4b8d1dc094e16a..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/bind/java/Seq.java
+++ /dev/null
@@ -1,251 +0,0 @@
-package go;
-
-import android.util.Log;
-import android.util.SparseArray;
-import android.util.SparseIntArray;
-
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-
-// Seq is a sequence of machine-dependent encoded values.
-// Used by automatically generated language bindings to talk to Go.
-public class Seq {
- @SuppressWarnings("UnusedDeclaration")
- private long memptr; // holds C-allocated pointer
-
- public Seq() {
- ensure(64);
- }
-
- // Ensure that at least size bytes can be written to the Seq.
- // Any existing data in the buffer is preserved.
- public native void ensure(int size);
-
- // Moves the internal buffer offset back to zero.
- // Length and contents are maintained. Data can be read after a reset.
- public native void resetOffset();
-
- public native void log(String label);
-
- public native byte readInt8();
- public native short readInt16();
- public native int readInt32();
- public native long readInt64();
- public long readInt() { return readInt64(); }
-
- public native float readFloat32();
- public native double readFloat64();
- public native String readUTF16();
- public native byte[] readByteArray();
-
- public native void writeInt8(byte v);
- public native void writeInt16(short v);
- public native void writeInt32(int v);
- public native void writeInt64(long v);
- public void writeInt(long v) { writeInt64(v); }
-
- public native void writeFloat32(float v);
- public native void writeFloat64(double v);
- public native void writeUTF16(String v);
- public native void writeByteArray(byte[] v);
-
- public void writeRef(Ref ref) {
- writeInt32(ref.refnum);
- }
-
- public Ref readRef() {
- int refnum = readInt32();
- return tracker.get(refnum);
- }
-
- // Informs the Go ref tracker that Java is done with this ref.
- static native void destroyRef(int refnum);
-
- // createRef creates a Ref to a Java object.
- public static Ref createRef(Seq.Object o) {
- return tracker.createRef(o);
- }
-
- // sends a function invocation request to Go.
- //
- // Blocks until the function completes.
- // If the request is for a method, the first element in src is
- // a Ref to the receiver.
- public static native void send(String descriptor, int code, Seq src, Seq dst);
-
- // recv returns the next request from Go for a Java call.
- static native void recv(Seq in, Receive params);
-
- // recvRes sends the result of a Java call back to Go.
- static native void recvRes(int handle, Seq out);
-
- static final class Receive {
- int refnum;
- int code;
- int handle;
- }
-
- protected void finalize() throws Throwable {
- super.finalize();
- free();
- }
- private native void free();
-
- private static final ExecutorService receivePool = Executors.newCachedThreadPool();
-
- // receive listens for callback requests from Go, invokes them on a thread
- // pool and sends the responses.
- public static void receive() {
- Seq.Receive params = new Seq.Receive();
- while (true) {
- final Seq in = new Seq();
- Seq.recv(in, params);
-
- final int code = params.code;
- final int handle = params.handle;
- final int refnum = params.refnum;
-
- if (code == -1) {
- // Special signal from seq.FinalizeRef.
- tracker.dec(refnum);
- Seq out = new Seq();
- Seq.recvRes(handle, out);
- continue;
- }
-
- receivePool.execute(new Runnable() {
- public void run() {
- Ref r = tracker.get(refnum);
- Seq out = new Seq();
- r.obj.call(code, in, out);
- Seq.recvRes(handle, out);
- }
- });
- }
- }
-
- // An Object is a Java object that matches a Go object.
- // The implementation of the object may be in either Java or Go,
- // with a proxy instance in the other language passing calls
- // through to the other language.
- //
- // Don't implement an Object directly. Instead, look for the
- // generated abstract Stub.
- public interface Object {
- public Ref ref();
- public void call(int code, Seq in, Seq out);
- }
-
- // A Ref is an object tagged with an integer for passing back and
- // forth across the language boundary.
- //
- // A Ref may represent either an instance of a Java Object subclass,
- // or an instance of a Go object. The explicit allocation of a Ref
- // is used to pin Go object instances when they are passed to Java.
- // The Go Seq library maintains a reference to the instance in a map
- // keyed by the Ref number. When the JVM calls finalize, we ask Go
- // to clear the entry in the map.
- public static final class Ref {
- // ref < 0: Go object tracked by Java
- // ref > 0: Java object tracked by Go
- int refnum;
- public Seq.Object obj;
-
- private Ref(int refnum, Seq.Object o) {
- this.refnum = refnum;
- this.obj = o;
- tracker.inc(refnum);
- }
-
- @Override
- protected void finalize() throws Throwable {
- tracker.dec(refnum);
- super.finalize();
- }
- }
-
- static final RefTracker tracker = new RefTracker();
-
- static final class RefTracker {
- // Next Java object reference number.
- //
- // Reference numbers are positive for Java objects,
- // and start, arbitrarily at a different offset to Go
- // to make debugging by reading Seq hex a little easier.
- private int next = 42; // next Java object ref
-
- // TODO(crawshaw): We could cut down allocations for frequently
- // sent Go objects by maintaining a map to weak references. This
- // however, would require allocating two objects per reference
- // instead of one. It also introduces weak references, the bane
- // of any Java debugging session.
- //
- // When we have real code, examine the tradeoffs.
-
- // Number of active references to a Go object. refnum -> count
- private SparseIntArray goObjs = new SparseIntArray();
-
- // Java objects that have been passed to Go. refnum -> Ref
- // The Ref obj field is non-null.
- // This map pins Java objects so they don't get GCed while the
- // only reference to them is held by Go code.
- private SparseArray<Ref> javaObjs = new SparseArray<Ref>();
-
- // inc increments the reference count to a Go object.
- synchronized void inc(int refnum) {
- if (refnum > 0) {
- return; // we don't count java objects
- }
- int count = goObjs.get(refnum);
- if (count == Integer.MAX_VALUE) {
- throw new RuntimeException("refnum " + refnum + " overflow");
- }
- goObjs.put(refnum, count+1);
- }
-
- // dec decrements the reference count to a Go object.
- // If the count reaches zero, the Go reference tracker is informed.
- synchronized void dec(int refnum) {
- if (refnum > 0) {
- // Java objects are removed on request of Go.
- javaObjs.remove(refnum);
- return;
- }
- int count = goObjs.get(refnum);
- if (count == 0) {
- throw new RuntimeException("refnum " + refnum + " underflow");
- }
- count--;
- if (count <= 0) {
- goObjs.delete(refnum);
- Seq.destroyRef(refnum);
- } else {
- goObjs.put(refnum, count);
- }
- }
-
- synchronized Ref createRef(Seq.Object o) {
- // TODO(crawshaw): use single Ref for null.
- if (next == Integer.MAX_VALUE) {
- throw new RuntimeException("createRef overflow for " + o);
- }
- int refnum = next++;
- Ref ref = new Ref(refnum, o);
- javaObjs.put(refnum, ref);
- return ref;
- }
-
- // get returns an existing Ref to either a Java or Go object.
- // It may be the first time we have seen the Go object.
- synchronized Ref get(int refnum) {
- if (refnum > 0) {
- Ref ref = javaObjs.get(refnum);
- if (ref == null) {
- throw new RuntimeException("unknown java Ref: "+refnum);
- }
- return ref;
- }
- return new Ref(refnum, null);
- }
- }
-}
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