Merge pull request #409 from mcav/alternate-info

Move alternateImpl detection into MethodInfo constructor.

classinfo.js

@@ -30,6 +30,10 @@ FieldInfo.prototype.toString = function() {
     return "[field " + this.name + "]";
 }
 
+function missingNativeImpl(key, ctx, stack) {
+    console.error("Attempted to invoke missing native:", key);
+}
+
 function MethodInfo(m, classInfo, constantPool) {
     this.classInfo = classInfo;
     this.name = constantPool[m.name_index].bytes;
@@ -50,10 +54,22 @@ function MethodInfo(m, classInfo, constantPool) {
     this.isPublic = ACCESS_FLAGS.isPublic(m.access_flags);
     this.isStatic = ACCESS_FLAGS.isStatic(m.access_flags);
     this.isSynchronized = ACCESS_FLAGS.isSynchronized(m.access_flags);
+    this.key = (this.isStatic ? "S." : "I.") + this.name + "." + this.signature;
+    this.implKey = this.classInfo.className + "." + this.name + "." + this.signature;
 
-    this.alternateImpl = (this.isNative ? Native :
-                          Override.hasMethod(this) ? Override :
-                          null);
+    if (this.isNative) {
+        if (this.implKey in Native) {
+            this.alternateImpl = Native[this.implKey];
+        } else {
+            // Some Native MethodInfos are constructed but never called;
+            // that's fine, unless we actually try to call them.
+            this.alternateImpl = missingNativeImpl.bind(null, this.implKey);
+        }
+    } else if (this.implKey in Override) {
+        this.alternateImpl = Override[this.implKey];
+    } else {
+        this.alternateImpl = null;
+    }
 }
 
 var ClassInfo = function(classBytes) {

instrument.js

@@ -10,12 +10,8 @@ var Instrument = {
   profiling: false,
   profile: null,
 
-  getKey: function(methodInfo) {
-    return methodInfo.classInfo.className + "." + methodInfo.name + "." + methodInfo.signature;
-  },
-
   callEnterHooks: function(methodInfo, caller, callee) {
-    var key = this.getKey(methodInfo);
+    var key = methodInfo.implKey;
     if (Instrument.enter[key]) {
       Instrument.enter[key](caller, callee);
     }
@@ -36,7 +32,7 @@ var Instrument = {
   },
 
   callExitHooks: function(methodInfo, caller, callee) {
-    var key = this.getKey(methodInfo);
+    var key = methodInfo.implKey;
 
     if (this.profiling) {
       var now = performance.now();
@@ -101,16 +97,15 @@ var Instrument = {
     this.profiling = false;
   },
 
-  measure: function(Alt, ctx, methodInfo) {
+  measure: function(alternateImpl, ctx, methodInfo) {
     if (this.profiling) {
       var then = performance.now();
-      Alt.invoke(ctx, methodInfo);
-      var key = this.getKey(methodInfo);
+      alternateImpl.call(null, ctx, ctx.current().stack);
       var methodProfileData = this.profile[key] || (this.profile[key] = { count: 0, cost: 0 });
       methodProfileData.count++;
       methodProfileData.cost += performance.now() - then;
     } else {
-      Alt.invoke(ctx, methodInfo);
+      alternateImpl.call(null, ctx, ctx.current().stack);
     }
   },
 };

native.js

@@ -5,18 +5,6 @@
 
 var Native = {};
 
-Native.invoke = function(ctx, methodInfo) {
-    if (!methodInfo.native) {
-        var key = methodInfo.classInfo.className + "." + methodInfo.name + "." + methodInfo.signature;
-        methodInfo.native = Native[key];
-        if (!methodInfo.native) {
-            console.error("Missing native: " + key);
-            ctx.raiseExceptionAndYield("java/lang/RuntimeException", key + " not found");
-        }
-    }
-    methodInfo.native.call(null, ctx, ctx.current().stack);
-}
-
 Native["java/lang/System.arraycopy.(Ljava/lang/Object;ILjava/lang/Object;II)V"] = function(ctx, stack) {
     var length = stack.pop(), dstOffset = stack.pop(), dst = stack.pop(), srcOffset = stack.pop(), src = stack.pop();
     if (!src || !dst)

override.js

@@ -5,26 +5,6 @@
 
 var Override = {};
 
-Override.getKey = function(methodInfo) {
-  return methodInfo.classInfo.className + "." + methodInfo.name + "." + methodInfo.signature;
-}
-
-Override.hasMethod = function(methodInfo) {
-  return ("override" in methodInfo || Override.getKey(methodInfo) in Override);
-}
-
-Override.invoke = function(ctx, methodInfo) {
-  if (!methodInfo.override) {
-    var key = Override.getKey(methodInfo);
-    methodInfo.override = Override[key];
-    if (!methodInfo.override) {
-      console.error("Missing override: " + key);
-      ctx.raiseExceptionAndYield("java/lang/RuntimeException", key + " not found");
-    }
-  }
-  methodInfo.override.call(null, ctx, ctx.current().stack);
-}
-
 Override["com/ibm/oti/connection/file/Connection.decode.(Ljava/lang/String;)Ljava/lang/String;"] = function(ctx, stack) {
   var string = util.fromJavaString(stack.pop());
   stack.push(ctx.newString(decodeURIComponent(string)));

vm.js

@@ -1040,10 +1040,6 @@ VM.execute = function(ctx) {
                 case OPCODES.invokevirtual:
                 case OPCODES.invokeinterface:
                     if (methodInfo.classInfo != obj.class) {
-                        if (!methodInfo.key) {
-                            methodInfo.key = "I." + methodInfo.name + "." + methodInfo.signature;
-                        }
-
                         // Check if the method is already in the virtual method cache
                         if (obj.class.vmc[methodInfo.key]) {
                           methodInfo = obj.class.vmc[methodInfo.key];