# HG changeset patch
# User Christian Wimmer <christian.wimmer@oracle.com>
# Date 1363660124 25200
# Node ID 55ef03d64f0361be590b35de675e582a7bcca5bc
# Parent  98b90a7bb764c9a2eaec524b5f3b8a94da2f4401
Generalize read and write of fixed register for snippets. Move to HotSpot-independent project.

diff -r 98b90a7bb764 -r 55ef03d64f03 graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/gen/LIRGenerator.java
--- a/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/gen/LIRGenerator.java	Mon Mar 18 19:21:01 2013 -0700
+++ b/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/gen/LIRGenerator.java	Mon Mar 18 19:28:44 2013 -0700
@@ -467,7 +467,7 @@
             }
         }
 
-        append(new ParametersOp(params));
+        emitIncomingValues(params);
 
         for (LocalNode local : graph.getNodes(LocalNode.class)) {
             Value param = params[local.index()];
@@ -476,6 +476,10 @@
         }
     }
 
+    public void emitIncomingValues(Value[] params) {
+        append(new ParametersOp(params));
+    }
+
     /**
      * Increases the number of currently locked monitors and makes sure that a lock data slot is
      * available for the new lock.
diff -r 98b90a7bb764 -r 55ef03d64f03 graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/RegisterNode.java
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/RegisterNode.java	Mon Mar 18 19:21:01 2013 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,72 +0,0 @@
-/*
- * Copyright (c) 2012, 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.graal.hotspot.nodes;
-
-import com.oracle.graal.api.code.*;
-import com.oracle.graal.api.meta.*;
-import com.oracle.graal.graph.*;
-import com.oracle.graal.nodes.*;
-import com.oracle.graal.nodes.spi.*;
-import com.oracle.graal.nodes.type.*;
-
-/**
- * Access the value of a specific register.
- */
-@NodeInfo(nameTemplate = "Register %{p#register}")
-public final class RegisterNode extends FixedWithNextNode implements LIRLowerable {
-
-    private final Register register;
-
-    public RegisterNode(Register register, Kind kind) {
-        super(StampFactory.forKind(kind));
-        this.register = register;
-    }
-
-    public RegisterNode(Register register) {
-        super(StampFactory.object());
-        this.register = register;
-    }
-
-    @Override
-    public void generate(LIRGeneratorTool generator) {
-        Value result;
-        if (generator.attributes(register).isAllocatable()) {
-            // The register allocator would prefer us not to tie up an allocatable
-            // register for the complete lifetime of this node.
-            result = generator.newVariable(kind());
-            generator.emitMove(result, register.asValue(kind()));
-        } else {
-            result = register.asValue(kind());
-        }
-        generator.setResult(this, result);
-    }
-
-    @Override
-    public String toString(Verbosity verbosity) {
-        if (verbosity == Verbosity.Name) {
-            return super.toString(Verbosity.Name) + "%" + register;
-        } else {
-            return super.toString(verbosity);
-        }
-    }
-}
diff -r 98b90a7bb764 -r 55ef03d64f03 graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/HotSpotSnippetUtils.java
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/HotSpotSnippetUtils.java	Mon Mar 18 19:21:01 2013 -0700
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/HotSpotSnippetUtils.java	Mon Mar 18 19:28:44 2013 -0700
@@ -34,6 +34,7 @@
 import com.oracle.graal.hotspot.nodes.*;
 import com.oracle.graal.nodes.extended.*;
 import com.oracle.graal.snippets.Snippet.Fold;
+import com.oracle.graal.snippets.nodes.*;
 import com.oracle.graal.word.*;
 
 //JaCoCo Exclude
@@ -338,22 +339,22 @@
      * Gets the value of the stack pointer register as a Word.
      */
     public static Word stackPointer() {
-        return HotSpotSnippetUtils.registerAsWord(stackPointerRegister());
+        return HotSpotSnippetUtils.registerAsWord(stackPointerRegister(), true, false);
     }
 
     /**
      * Gets the value of the thread register as a Word.
      */
     public static Word thread() {
-        return HotSpotSnippetUtils.registerAsWord(threadRegister());
+        return HotSpotSnippetUtils.registerAsWord(threadRegister(), true, false);
     }
 
     public static Word loadWordFromObject(Object object, int offset) {
         return loadWordFromObjectIntrinsic(object, 0, offset, wordKind());
     }
 
-    @NodeIntrinsic(value = RegisterNode.class, setStampFromReturnType = true)
-    public static native Word registerAsWord(@ConstantNodeParameter Register register);
+    @NodeIntrinsic(value = ReadRegisterNode.class, setStampFromReturnType = true)
+    public static native Word registerAsWord(@ConstantNodeParameter Register register, @ConstantNodeParameter boolean directUse, @ConstantNodeParameter boolean incoming);
 
     @NodeIntrinsic(value = UnsafeLoadNode.class, setStampFromReturnType = true)
     private static native Word loadWordFromObjectIntrinsic(Object object, @ConstantNodeParameter int displacement, long offset, @ConstantNodeParameter Kind wordKind);
diff -r 98b90a7bb764 -r 55ef03d64f03 graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/nodes/ReadRegisterNode.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/nodes/ReadRegisterNode.java	Mon Mar 18 19:28:44 2013 -0700
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2012, 2013, 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.graal.snippets.nodes;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.gen.*;
+import com.oracle.graal.compiler.target.*;
+import com.oracle.graal.graph.*;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.type.*;
+
+/**
+ * Access the value of a specific register.
+ */
+@NodeInfo(nameTemplate = "ReadRegister %{p#register}")
+public final class ReadRegisterNode extends FixedWithNextNode implements LIRGenLowerable {
+
+    /**
+     * The fixed register to access.
+     */
+    private final Register register;
+
+    /**
+     * When true, subsequent uses of this node use the fixed register; when false, the value is
+     * moved into a new virtual register so that the fixed register is not seen by uses.
+     */
+    private final boolean directUse;
+
+    /**
+     * When true, this node is also an implicit definition of the value for the register allocator,
+     * i.e., the register is an implicit incoming value; when false, the register must be defined in
+     * the same method or must be an register excluded from register allocation.
+     */
+    private final boolean incoming;
+
+    public ReadRegisterNode(Register register, Kind kind, boolean directUse, boolean incoming) {
+        super(StampFactory.forKind(kind));
+        this.register = register;
+        this.directUse = directUse;
+        this.incoming = incoming;
+    }
+
+    /**
+     * Constructor to be used by node intrinsics where the stamp is inferred from the intrinsic
+     * definition.
+     */
+    public ReadRegisterNode(Register register, boolean directUse, boolean incoming) {
+        super(StampFactory.forNodeIntrinsic());
+        this.register = register;
+        this.directUse = directUse;
+        this.incoming = incoming;
+    }
+
+    @Override
+    public void generate(LIRGenerator generator) {
+        Value result = register.asValue(kind());
+        if (incoming) {
+            generator.emitIncomingValues(new Value[]{result});
+        }
+        if (!directUse) {
+            result = generator.emitMove(result);
+        }
+        generator.setResult(this, result);
+    }
+
+    @Override
+    public String toString(Verbosity verbosity) {
+        if (verbosity == Verbosity.Name) {
+            return super.toString(Verbosity.Name) + "%" + register;
+        } else {
+            return super.toString(verbosity);
+        }
+    }
+}
diff -r 98b90a7bb764 -r 55ef03d64f03 graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/nodes/WriteRegisterNode.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/nodes/WriteRegisterNode.java	Mon Mar 18 19:28:44 2013 -0700
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2013, 2013, 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.graal.snippets.nodes;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.graph.*;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.spi.*;
+import com.oracle.graal.nodes.type.*;
+
+/**
+ * Changes the value of a specific register.
+ */
+@NodeInfo(nameTemplate = "WriteRegister %{p#register}")
+public final class WriteRegisterNode extends FixedWithNextNode implements LIRLowerable {
+
+    /**
+     * The fixed register to access.
+     */
+    private final Register register;
+
+    /**
+     * The new value assigned to the register.
+     */
+    @Input private ValueNode value;
+
+    public WriteRegisterNode(Register register, ValueNode value) {
+        super(StampFactory.forVoid());
+        this.register = register;
+        this.value = value;
+    }
+
+    @Override
+    public void generate(LIRGeneratorTool generator) {
+        Value val = generator.operand(value);
+        generator.emitMove(val, register.asValue(val.getKind()));
+    }
+
+    @Override
+    public String toString(Verbosity verbosity) {
+        if (verbosity == Verbosity.Name) {
+            return super.toString(Verbosity.Name) + "%" + register;
+        } else {
+            return super.toString(verbosity);
+        }
+    }
+}