--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotSignature.java	Tue May 26 17:13:37 2015 +0200
@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.jvmci.hotspot;
+
+import java.util.*;
+
+import com.oracle.graal.api.meta.*;
+import com.oracle.jvmci.common.*;
+
+/**
+ * Represents a method signature.
+ */
+public class HotSpotSignature implements Signature {
+
+    private final List<String> parameters = new ArrayList<>();
+    private final String returnType;
+    private final String originalString;
+    private ResolvedJavaType[] parameterTypes;
+    private ResolvedJavaType returnTypeCache;
+    private final HotSpotJVMCIRuntimeProvider runtime;
+
+    public HotSpotSignature(HotSpotJVMCIRuntimeProvider runtime, String signature) {
+        this.runtime = runtime;
+        assert signature.length() > 0;
+        this.originalString = signature;
+
+        if (signature.charAt(0) == '(') {
+            int cur = 1;
+            while (cur < signature.length() && signature.charAt(cur) != ')') {
+                int nextCur = parseSignature(signature, cur);
+                parameters.add(signature.substring(cur, nextCur));
+                cur = nextCur;
+            }
+
+            cur++;
+            int nextCur = parseSignature(signature, cur);
+            returnType = signature.substring(cur, nextCur);
+            assert nextCur == signature.length();
+        } else {
+            returnType = null;
+        }
+    }
+
+    public HotSpotSignature(HotSpotJVMCIRuntimeProvider runtime, ResolvedJavaType returnType, ResolvedJavaType... parameterTypes) {
+        this.runtime = runtime;
+        this.parameterTypes = parameterTypes.clone();
+        this.returnTypeCache = returnType;
+        this.returnType = returnType.getName();
+        StringBuilder sb = new StringBuilder("(");
+        for (JavaType type : parameterTypes) {
+            parameters.add(type.getName());
+            sb.append(type.getName());
+        }
+        sb.append(")").append(returnType.getName());
+        this.originalString = sb.toString();
+        assert new HotSpotSignature(runtime, originalString).equals(this);
+    }
+
+    private static int parseSignature(String signature, int start) {
+        int cur = start;
+        char first;
+        do {
+            first = signature.charAt(cur++);
+        } while (first == '[');
+
+        switch (first) {
+            case 'L':
+                while (signature.charAt(cur) != ';') {
+                    cur++;
+                }
+                cur++;
+                break;
+            case 'V':
+            case 'I':
+            case 'B':
+            case 'C':
+            case 'D':
+            case 'F':
+            case 'J':
+            case 'S':
+            case 'Z':
+                break;
+            default:
+                throw new JVMCIError("Invalid character at index %d in signature: %s", cur, signature);
+        }
+        return cur;
+    }
+
+    @Override
+    public int getParameterCount(boolean withReceiver) {
+        return parameters.size() + (withReceiver ? 1 : 0);
+    }
+
+    @Override
+    public Kind getParameterKind(int index) {
+        return Kind.fromTypeString(parameters.get(index));
+    }
+
+    private static boolean checkValidCache(ResolvedJavaType type, ResolvedJavaType accessingClass) {
+        assert accessingClass != null;
+        if (type == null) {
+            return false;
+        } else if (type instanceof HotSpotResolvedObjectTypeImpl) {
+            return ((HotSpotResolvedObjectTypeImpl) type).isDefinitelyResolvedWithRespectTo(accessingClass);
+        }
+        return true;
+    }
+
+    private static JavaType getUnresolvedOrPrimitiveType(HotSpotJVMCIRuntimeProvider runtime, String name) {
+        if (name.length() == 1) {
+            Kind kind = Kind.fromPrimitiveOrVoidTypeChar(name.charAt(0));
+            return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(kind.toJavaClass());
+        }
+        return new HotSpotUnresolvedJavaType(name, runtime);
+    }
+
+    @Override
+    public JavaType getParameterType(int index, ResolvedJavaType accessingClass) {
+        if (accessingClass == null) {
+            // Caller doesn't care about resolution context so return an unresolved
+            // or primitive type (primitive type resolution is context free)
+            return getUnresolvedOrPrimitiveType(runtime, parameters.get(index));
+        }
+        if (parameterTypes == null) {
+            parameterTypes = new ResolvedJavaType[parameters.size()];
+        }
+
+        ResolvedJavaType type = parameterTypes[index];
+        if (!checkValidCache(type, accessingClass)) {
+            JavaType result = runtime.lookupType(parameters.get(index), (HotSpotResolvedObjectType) accessingClass, false);
+            if (result instanceof ResolvedJavaType) {
+                type = (ResolvedJavaType) result;
+                parameterTypes[index] = type;
+            } else {
+                return result;
+            }
+        }
+        return type;
+    }
+
+    @Override
+    public String toMethodDescriptor() {
+        assert originalString.equals(Signature.super.toMethodDescriptor());
+        return originalString;
+    }
+
+    @Override
+    public Kind getReturnKind() {
+        return Kind.fromTypeString(returnType);
+    }
+
+    @Override
+    public JavaType getReturnType(ResolvedJavaType accessingClass) {
+        if (accessingClass == null) {
+            // Caller doesn't care about resolution context so return an unresolved
+            // or primitive type (primitive type resolution is context free)
+            return getUnresolvedOrPrimitiveType(runtime, returnType);
+        }
+        if (!checkValidCache(returnTypeCache, accessingClass)) {
+            JavaType result = runtime.lookupType(returnType, (HotSpotResolvedObjectType) accessingClass, false);
+            if (result instanceof ResolvedJavaType) {
+                returnTypeCache = (ResolvedJavaType) result;
+            } else {
+                return result;
+            }
+        }
+        return returnTypeCache;
+    }
+
+    @Override
+    public String toString() {
+        return "HotSpotSignature<" + originalString + ">";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof HotSpotSignature) {
+            HotSpotSignature other = (HotSpotSignature) obj;
+            if (other.originalString.equals(originalString)) {
+                assert other.parameters.equals(parameters);
+                assert other.returnType.equals(returnType);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return originalString.hashCode();
+    }
+}