ffi wrapper

lib/ffi.dart

@@ -0,0 +1,594 @@
+/*
+ * @Description: 
+ * @Author: ekibun
+ * @Date: 2020-09-19 10:29:04
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-09-20 15:41:02
+ */
+import 'dart:ffi';
+
+import 'package:ffi/ffi.dart';
+
+abstract class JSRef {
+  void release();
+}
+
+/// JS_Eval() flags
+class JSEvalType {
+  static const GLOBAL = 0 << 0;
+  static const MODULE = 1 << 0;
+}
+
+class JSProp {
+  static const CONFIGURABLE = (1 << 0);
+  static const WRITABLE = (1 << 1);
+  static const ENUMERABLE = (1 << 2);
+  static const C_W_E = (CONFIGURABLE | WRITABLE | ENUMERABLE);
+} 
+
+class JSTag {
+  static const FIRST = -11; /* first negative tag */
+  static const BIG_DECIMAL = -11;
+  static const BIG_INT = -10;
+  static const BIG_FLOAT = -9;
+  static const SYMBOL = -8;
+  static const STRING = -7;
+  static const MODULE = -3; /* used internally */
+  static const FUNCTION_BYTECODE = -2; /* used internally */
+  static const OBJECT = -1;
+
+  static const INT = 0;
+  static const BOOL = 1;
+  static const NULL = 2;
+  static const UNDEFINED = 3;
+  static const UNINITIALIZED = 4;
+  static const CATCH_OFFSET = 5;
+  static const EXCEPTION = 6;
+  static const FLOAT64 = 7;
+}
+
+final DynamicLibrary qjsLib = DynamicLibrary.open("test/lib/build/Debug/ffi_library.dll");
+
+/// JSValue *jsEXCEPTION()
+final Pointer Function() jsEXCEPTION =
+    qjsLib.lookup<NativeFunction<Pointer Function()>>("jsEXCEPTION").asFunction();
+
+/// JSValue *jsUNDEFINED()
+final Pointer Function() jsUNDEFINED =
+    qjsLib.lookup<NativeFunction<Pointer Function()>>("jsUNDEFINED").asFunction();
+
+/// JSRuntime *jsNewRuntime(JSChannel channel)
+final Pointer Function(
+  Pointer<NativeFunction<Pointer Function(Pointer ctx, Pointer method, Pointer argv)>>,
+) _jsNewRuntime = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+    )>>("jsNewRuntime")
+    .asFunction();
+
+typedef JSChannel = Pointer Function(Pointer ctx, String method, Pointer argv);
+
+class RuntimeOpaque {
+  JSChannel channel;
+  List<JSRef> ref = List();
+}
+
+final Map<Pointer, RuntimeOpaque> runtimeOpaques = Map();
+
+Pointer channelDispacher(Pointer ctx, Pointer<Utf8> method, Pointer argv) {
+  return runtimeOpaques[jsGetRuntime(ctx)].channel(ctx, Utf8.fromUtf8(method), argv);
+}
+
+Pointer jsNewRuntime(
+  JSChannel callback,
+) {
+  var rt = _jsNewRuntime(Pointer.fromFunction(channelDispacher));
+  runtimeOpaques[rt] = RuntimeOpaque()..channel = callback;
+  return rt;
+}
+
+/// void jsFreeRuntime(JSRuntime *rt)
+final void Function(
+  Pointer,
+) _jsFreeRuntime = qjsLib
+    .lookup<
+        NativeFunction<
+            Void Function(
+      Pointer,
+    )>>("jsFreeRuntime")
+    .asFunction();
+
+void jsFreeRuntime(
+  Pointer rt,
+) {
+  runtimeOpaques[rt]?.ref?.forEach((val) {
+    val.release();
+  });
+  runtimeOpaques.remove(rt);
+  _jsFreeRuntime(rt);
+}
+
+/// JSContext *jsNewContext(JSRuntime *rt)
+final Pointer Function(
+  Pointer rt,
+) jsNewContext = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+    )>>("jsNewContext")
+    .asFunction();
+
+/// void jsFreeContext(JSContext *ctx)
+final void Function(
+  Pointer,
+) jsFreeContext = qjsLib
+    .lookup<
+        NativeFunction<
+            Void Function(
+      Pointer,
+    )>>("jsFreeContext")
+    .asFunction();
+
+/// JSRuntime *jsGetRuntime(JSContext *ctx)
+final Pointer Function(
+  Pointer,
+) jsGetRuntime = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+    )>>("jsGetRuntime")
+    .asFunction();
+
+/// JSValue *jsEval(JSContext *ctx, const char *input, size_t input_len, const char *filename, int eval_flags)
+final Pointer Function(
+  Pointer ctx,
+  Pointer<Utf8> input,
+  int inputLen,
+  Pointer<Utf8> filename,
+  int evalFlags,
+) _jsEval = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer<Utf8>,
+      Int64,
+      Pointer<Utf8>,
+      Int32,
+    )>>("jsEval")
+    .asFunction();
+
+Pointer jsEval(
+  Pointer ctx,
+  String input,
+  String filename,
+  int evalFlags,
+) {
+  var utf8input = Utf8.toUtf8(input);
+  var utf8filename = Utf8.toUtf8(filename);
+  var val = _jsEval(ctx, utf8input, Utf8.strlen(utf8input), utf8filename, evalFlags);
+  free(utf8input);
+  free(utf8filename);
+  return val;
+}
+
+/// DLLEXPORT int32_t jsValueGetTag(JSValue *val)
+final int Function(
+  Pointer val,
+) jsValueGetTag = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Pointer,
+    )>>("jsValueGetTag")
+    .asFunction();
+
+/// void *jsValueGetPtr(JSValue *val)
+final Pointer Function(
+  Pointer val,
+) jsValueGetPtr = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+    )>>("jsValueGetPtr")
+    .asFunction();
+
+/// DLLEXPORT bool jsTagIsFloat64(int32_t tag)
+final int Function(
+  int val,
+) jsTagIsFloat64 = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Int32,
+    )>>("jsTagIsFloat64")
+    .asFunction();
+
+/// JSValue *jsNewBool(JSContext *ctx, int val)
+final Pointer Function(
+  Pointer ctx,
+  int val,
+) jsNewBool = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Int32,
+    )>>("jsNewBool")
+    .asFunction();
+
+/// JSValue *jsNewInt64(JSContext *ctx, int64_t val)
+final Pointer Function(
+  Pointer ctx,
+  int val,
+) jsNewInt64 = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Int64,
+    )>>("jsNewInt64")
+    .asFunction();
+
+/// JSValue *jsNewFloat64(JSContext *ctx, double val)
+final Pointer Function(
+  Pointer ctx,
+  double val,
+) jsNewFloat64 = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Double,
+    )>>("jsNewFloat64")
+    .asFunction();
+
+/// JSValue *jsNewString(JSContext *ctx, const char *str)
+final Pointer Function(
+  Pointer ctx,
+  Pointer<Utf8> str,
+) _jsNewString = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer<Utf8>,
+    )>>("jsNewString")
+    .asFunction();
+
+Pointer jsNewString(
+  Pointer ctx,
+  String str,
+) {
+  var utf8str = Utf8.toUtf8(str);
+  return _jsNewString(ctx, utf8str);
+}
+
+/// JSValue *jsNewArrayBufferCopy(JSContext *ctx, const uint8_t *buf, size_t len)
+final Pointer Function(
+  Pointer ctx,
+  Pointer<Uint8> buf,
+  int len,
+) jsNewArrayBufferCopy = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer<Uint8>,
+      Uint64,
+    )>>("jsNewArrayBufferCopy")
+    .asFunction();
+
+/// JSValue *jsNewArray(JSContext *ctx)
+final Pointer Function(
+  Pointer ctx,
+) jsNewArray = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+    )>>("jsNewArray")
+    .asFunction();
+
+/// JSValue *jsNewObject(JSContext *ctx)
+final Pointer Function(
+  Pointer ctx,
+) jsNewObject = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+    )>>("jsNewObject")
+    .asFunction();
+
+/// void jsFreeValue(JSContext *ctx, JSValue *val)
+final void Function(
+  Pointer ctx,
+  Pointer val,
+) jsFreeValue = qjsLib
+    .lookup<
+        NativeFunction<
+            Void Function(
+      Pointer,
+      Pointer,
+    )>>("jsFreeValue")
+    .asFunction();
+
+/// void jsFreeValueRT(JSRuntime *rt, JSValue *v)
+final void Function(
+  Pointer rt,
+  Pointer val,
+) jsFreeValueRT = qjsLib
+    .lookup<
+        NativeFunction<
+            Void Function(
+      Pointer,
+      Pointer,
+    )>>("jsFreeValueRT")
+    .asFunction();
+
+/// JSValue *jsDupValue(JSContext *ctx, JSValueConst *v)
+final Pointer Function(
+  Pointer ctx,
+  Pointer val,
+) jsDupValue = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer,
+    )>>("jsDupValue")
+    .asFunction();
+
+/// JSValue *jsDupValueRT(JSRuntime *rt, JSValue *v)
+final Pointer Function(
+  Pointer rt,
+  Pointer val,
+) jsDupValueRT = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer,
+    )>>("jsDupValueRT")
+    .asFunction();
+
+/// int32_t jsToBool(JSContext *ctx, JSValueConst *val)
+final int Function(
+  Pointer ctx,
+  Pointer val,
+) jsToBool = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Pointer,
+      Pointer,
+    )>>("jsToBool")
+    .asFunction();
+
+/// int64_t jsToFloat64(JSContext *ctx, JSValueConst *val)
+final int Function(
+  Pointer ctx,
+  Pointer val,
+) jsToInt64 = qjsLib
+    .lookup<
+        NativeFunction<
+            Int64 Function(
+      Pointer,
+      Pointer,
+    )>>("jsToInt64")
+    .asFunction();
+
+/// double jsToFloat64(JSContext *ctx, JSValueConst *val)
+final double Function(
+  Pointer ctx,
+  Pointer val,
+) jsToFloat64 = qjsLib
+    .lookup<
+        NativeFunction<
+            Double Function(
+      Pointer,
+      Pointer,
+    )>>("jsToFloat64")
+    .asFunction();
+
+/// const char *jsToCString(JSContext *ctx, JSValue *val)
+final Pointer<Utf8> Function(
+  Pointer ctx,
+  Pointer val,
+) _jsToCString = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer<Utf8> Function(
+      Pointer,
+      Pointer,
+    )>>("jsToCString")
+    .asFunction();
+
+/// void jsFreeCString(JSContext *ctx, const char *ptr)
+final void Function(
+  Pointer ctx,
+  Pointer<Utf8> val,
+) jsFreeCString = qjsLib
+    .lookup<
+        NativeFunction<
+            Void Function(
+      Pointer,
+      Pointer<Utf8>,
+    )>>("jsFreeCString")
+    .asFunction();
+
+String jsToCString(
+  Pointer ctx,
+  Pointer val,
+) {
+  var ptr = _jsToCString(ctx, val);
+  var str = Utf8.fromUtf8(ptr);
+  jsFreeCString(ctx, ptr);
+  return str;
+}
+
+/// uint8_t *jsGetArrayBuffer(JSContext *ctx, size_t *psize, JSValueConst *obj)
+final Pointer<Uint8> Function(
+  Pointer ctx,
+  Pointer<Int64> psize,
+  Pointer val,
+) jsGetArrayBuffer = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer<Uint8> Function(
+      Pointer,
+      Pointer<Int64>,
+      Pointer,
+    )>>("jsGetArrayBuffer")
+    .asFunction();
+
+/// int32_t jsIsFunction(JSContext *ctx, JSValueConst *val)
+final int Function(
+  Pointer ctx,
+  Pointer val,
+) jsIsFunction = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Pointer,
+      Pointer,
+    )>>("jsIsFunction")
+    .asFunction();
+
+/// int32_t jsIsArray(JSContext *ctx, JSValueConst *val)
+final int Function(
+  Pointer ctx,
+  Pointer val,
+) jsIsArray = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Pointer,
+      Pointer,
+    )>>("jsIsArray")
+    .asFunction();
+
+/// void deleteJSValue(JSValueConst *val)
+final void Function(
+  Pointer val,
+) deleteJSValue = qjsLib
+    .lookup<
+        NativeFunction<
+            Void Function(
+      Pointer,
+    )>>("deleteJSValue")
+    .asFunction();
+
+/// JSValue *jsGetProperty(JSContext *ctx, JSValueConst *this_obj,
+///                           JSAtom prop)
+final Pointer Function(
+  Pointer ctx,
+  Pointer thisObj,
+  int prop,
+) jsGetProperty = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer,
+      Uint32,
+    )>>("jsGetProperty")
+    .asFunction();
+
+/// int jsDefinePropertyValue(JSContext *ctx, JSValueConst *this_obj,
+///                           JSAtom prop, JSValue *val, int flags)
+final int Function(
+  Pointer ctx,
+  Pointer thisObj,
+  int prop,
+  Pointer val,
+  int flag
+) jsDefinePropertyValue = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Pointer,
+      Pointer,
+      Uint32,
+      Pointer,
+      Int32,
+    )>>("jsDefinePropertyValue")
+    .asFunction();
+
+/// void jsFreeAtom(JSContext *ctx, JSAtom v)
+final Pointer Function(
+  Pointer ctx,
+  int v,
+) jsFreeAtom = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Uint32,
+    )>>("jsFreeAtom")
+    .asFunction();
+
+/// JSAtom jsValueToAtom(JSContext *ctx, JSValueConst *val)
+final int Function(
+  Pointer ctx,
+  Pointer val,
+) jsValueToAtom = qjsLib
+    .lookup<
+        NativeFunction<
+            Uint32 Function(
+      Pointer,
+      Pointer,
+    )>>("jsValueToAtom")
+    .asFunction();
+
+/// JSValue *jsAtomToValue(JSContext *ctx, JSAtom val)
+final Pointer Function(
+  Pointer ctx,
+  int val,
+) jsAtomToValue = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Uint32,
+    )>>("jsAtomToValue")
+    .asFunction();
+
+/// int jsGetOwnPropertyNames(JSContext *ctx, JSPropertyEnum **ptab,
+///                           uint32_t *plen, JSValueConst *obj, int flags)
+final int Function(
+  Pointer ctx,
+  Pointer<Pointer> ptab,
+  Pointer<Uint32> plen,
+  Pointer obj,
+  int flags,
+) jsGetOwnPropertyNames = qjsLib
+    .lookup<
+        NativeFunction<
+            Int32 Function(
+      Pointer,
+      Pointer<Pointer>,
+      Pointer<Uint32>,
+      Pointer,
+      Int32,
+    )>>("jsGetOwnPropertyNames")
+    .asFunction();
+
+/// JSAtom jsPropertyEnumGetAtom(JSPropertyEnum *ptab, int i)
+final int Function(
+  Pointer ptab,
+  int i,
+) jsPropertyEnumGetAtom = qjsLib
+    .lookup<
+        NativeFunction<
+            Uint32 Function(
+      Pointer,
+      Int32,
+    )>>("jsPropertyEnumGetAtom")
+    .asFunction();

lib/wrapper.dart

@@ -0,0 +1,177 @@
+/*
+ * @Description: 
+ * @Author: ekibun
+ * @Date: 2020-09-19 22:07:47
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-09-20 15:41:16
+ */
+import 'dart:ffi';
+import 'dart:typed_data';
+
+import 'package:ffi/ffi.dart';
+
+import 'ffi.dart';
+
+class JSFunction extends JSRef {
+  Pointer val;
+  Pointer ctx;
+  JSFunction(this.ctx, Pointer val) {
+    Pointer rt = jsGetRuntime(ctx);
+    this.val = jsDupValue(ctx, val);
+    runtimeOpaques[rt]?.ref?.add(this);
+  }
+
+  @override
+  void release() {
+    if (val != null) {
+      jsFreeValue(ctx, val);
+      deleteJSValue(val);
+      val = null;
+    }
+  }
+
+  @override
+  noSuchMethod(Invocation invocation) {
+    return super.noSuchMethod(invocation);
+  }
+}
+
+Pointer dartToJs(Pointer ctx, dynamic val, {Map<dynamic, dynamic> cache}) {
+  if (cache == null) cache = Map();
+  if (val is bool) return jsNewBool(ctx, val ? 1 : 0);
+  if (val is int) return jsNewInt64(ctx, val);
+  if (val is double) return jsNewFloat64(ctx, val);
+  if (val is String) return jsNewString(ctx, val);
+  if (val is Uint8List) {
+    var ptr = allocate<Uint8>(count: val.length);
+    var byteList = ptr.asTypedList(val.length);
+    byteList.setAll(0, val);
+    var ret = jsNewArrayBufferCopy(ctx, ptr, val.length);
+    free(ptr);
+    return ret;
+  }
+  if (cache.containsKey(val)) {
+    return cache[val];
+  }
+  if (val is JSFunction) {
+    return jsDupValue(ctx, val.val);
+  }
+  if (val is List) {
+    Pointer ret = jsNewArray(ctx);
+    cache[val] = ret;
+    for (int i = 0; i < val.length; ++i) {
+      var jsAtomVal = jsNewInt64(ctx, i);
+      var jsAtom = jsValueToAtom(ctx, jsAtomVal);
+      jsDefinePropertyValue(
+        ctx,
+        ret,
+        jsAtom,
+        dartToJs(ctx, val[i], cache: cache),
+        JSProp.C_W_E,
+      );
+      jsFreeAtom(ctx, jsAtom);
+      jsFreeValue(ctx, jsAtomVal);
+      deleteJSValue(jsAtomVal);
+    }
+    return ret;
+  }
+  if (val is Map) {
+    Pointer ret = jsNewObject(ctx);
+    cache[val] = ret;
+    for (MapEntry<dynamic, dynamic> entry in val.entries){
+      var jsAtomVal = dartToJs(ctx, entry.key, cache: cache);
+      var jsAtom = jsValueToAtom(ctx, jsAtomVal);
+      jsDefinePropertyValue(
+        ctx,
+        ret,
+        jsAtom,
+        dartToJs(ctx, entry.value, cache: cache),
+        JSProp.C_W_E,
+      );
+      jsFreeAtom(ctx, jsAtom);
+      jsFreeValue(ctx, jsAtomVal);
+      deleteJSValue(jsAtomVal);
+    }
+    return ret;
+  }
+  return jsUNDEFINED();
+}
+
+dynamic jsToDart(Pointer ctx, Pointer val, {Map<int, dynamic> cache}) {
+  if (cache == null) cache = Map();
+  int tag = jsValueGetTag(val);
+  if (jsTagIsFloat64(tag) != 0) {
+    return jsToFloat64(ctx, val);
+  }
+  switch (tag) {
+    case JSTag.BOOL:
+      return jsToBool(ctx, val) != 0;
+    case JSTag.INT:
+      return jsToInt64(ctx, val);
+    case JSTag.STRING:
+      return jsToCString(ctx, val);
+    case JSTag.OBJECT:
+      Pointer<Int64> psize = allocate<Int64>();
+      Pointer<Uint8> buf = jsGetArrayBuffer(ctx, psize, val);
+      int size = psize.value;
+      free(psize);
+      if (buf.address != 0) {
+        return buf.asTypedList(size);
+      }
+      int valptr = jsValueGetPtr(val).address;
+      if (cache.containsKey(valptr)) {
+        return cache[valptr];
+      }
+      if (jsIsFunction(ctx, val) != 0) {
+        return JSFunction(ctx, val);
+      } else if (jsIsArray(ctx, val) != 0) {
+        var jsAtomVal = jsNewString(ctx, "length");
+        var jsAtom = jsValueToAtom(ctx, jsAtomVal);
+        var jslength = jsGetProperty(ctx, val, jsAtom);
+        jsFreeAtom(ctx, jsAtom);
+        jsFreeValue(ctx, jsAtomVal);
+        deleteJSValue(jsAtomVal);
+
+        int length = jsToInt64(ctx, jslength);
+        deleteJSValue(jslength);
+        List<dynamic> ret = List();
+        cache[valptr] = ret;
+        for (int i = 0; i < length; ++i) {
+          var jsAtomVal = jsNewInt64(ctx, i);
+          var jsAtom = jsValueToAtom(ctx, jsAtomVal);
+          var jsProp = jsGetProperty(ctx, val, jsAtom);
+          jsFreeAtom(ctx, jsAtom);
+          jsFreeValue(ctx, jsAtomVal);
+          deleteJSValue(jsAtomVal);
+          ret.add(jsToDart(ctx, jsProp, cache: cache));
+          jsFreeValue(ctx, jsProp);
+          deleteJSValue(jsProp);
+        }
+        return ret;
+      } else {
+        Pointer<Pointer> ptab = allocate<Pointer>();
+        Pointer<Uint32> plen = allocate<Uint32>();
+        if (jsGetOwnPropertyNames(ctx, ptab, plen, val, -1) != 0) return null;
+        int len = plen.value;
+        free(plen);
+        Map<dynamic, dynamic> ret = Map();
+        cache[valptr] = ret;
+        for (int i = 0; i < len; ++i) {
+          var jsAtom = jsPropertyEnumGetAtom(ptab.value, i);
+          var jsAtomValue = jsAtomToValue(ctx, jsAtom);
+          var jsProp = jsGetProperty(ctx, val, jsAtom);
+          ret[jsToDart(ctx, jsAtomValue, cache: cache)] = jsToDart(ctx, jsProp, cache: cache);
+          jsFreeValue(ctx, jsAtomValue);
+          deleteJSValue(jsAtomValue);
+          jsFreeValue(ctx, jsProp);
+          deleteJSValue(jsProp);
+          jsFreeAtom(ctx, jsAtom);
+        }
+        free(ptab);
+        return ret;
+      }
+      break;
+    default:
+  }
+  return null;
+}