--- a/graal/GraalCompiler/src/com/sun/c1x/C1XCompilation.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/C1XCompilation.java	Fri Apr 29 13:19:17 2011 +0200
@@ -94,7 +94,7 @@
         this.method = method;
         this.stats = stats == null ? new CiStatistics() : stats;
         this.registerConfig = method == null ? compiler.globalStubRegisterConfig : runtime.getRegisterConfig(method);
-        this.placeholderState = method != null && method.minimalDebugInfo() ? new MutableFrameState(new IRScope(null, null, method, -1), 0, 0, 0) : null;
+        this.placeholderState = method != null && method.minimalDebugInfo() ? new MutableFrameState(method, 0, 0, 0) : null;
 
         if (compiler.isObserved()) {
             compiler.fireCompilationStarted(new CompilationEvent(this));
@@ -241,7 +241,7 @@
                 C1XTimers.LIR_CREATE.start();
             }
 
-            initFrameMap(hir.topScope.maxLocks());
+            initFrameMap(hir.maxLocks());
 
             lirGenerator = compiler.backend.newLIRGenerator(this);
             for (BlockBegin begin : hir.linearScanOrder()) {

--- a/graal/GraalCompiler/src/com/sun/c1x/alloc/LinearScan.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/alloc/LinearScan.java	Fri Apr 29 13:19:17 2011 +0200
@@ -2084,14 +2084,6 @@
     }
 
     CiFrame computeFrameForState(int opId, FrameState state, CiBitMap frameRefMap) {
-        CiFrame callerFrame = null;
-
-        FrameState callerState = state.callerState();
-        if (callerState != null) {
-            // process recursively to compute outermost scope first
-            callerFrame = computeFrameForState(opId, callerState, frameRefMap);
-        }
-
         CiValue[] values = new CiValue[state.valuesSize() + state.locksSize()];
         int valueIndex = 0;
 
@@ -2117,7 +2109,7 @@
             }
         }
 
-        return new CiFrame(callerFrame, state.scope().method, state.bci, values, state.localsSize(), state.stackSize(), state.locksSize());
+        return new CiFrame(null, state.method, state.bci, values, state.localsSize(), state.stackSize(), state.locksSize());
     }
 
     private void computeDebugInfo(IntervalWalker iw, LIRInstruction op) {

--- a/graal/GraalCompiler/src/com/sun/c1x/debug/BlockPrinter.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/debug/BlockPrinter.java	Fri Apr 29 13:19:17 2011 +0200
@@ -56,8 +56,6 @@
         printFrameState(block.stateBefore(), out);
         out.println();
 
-        out.println("inlining depth " + block.stateBefore().scope().level);
-
         ip.printInstructionListingHeader();
 
         for (Instruction i = block.next(); i != null; i = i.next()) {

--- a/graal/GraalCompiler/src/com/sun/c1x/debug/CFGPrinter.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/debug/CFGPrinter.java	Fri Apr 29 13:19:17 2011 +0200
@@ -99,6 +99,10 @@
 
     private void end(String string) {
         out.adjustIndentation(-2);
+        end("states");
+        end("states");
+        end("states");
+        end("states");
         out.println("end_" + string);
     }
 
@@ -127,6 +131,7 @@
     void printBlock(BlockBegin block, List<BlockBegin> successors, Iterable<BlockBegin> handlers, boolean printHIR, boolean printLIR) {
         begin("block");
 
+        end("states");
         out.print("name \"B").print(block.blockID).println('"');
         out.print("from_bci ").println(block.bci());
         out.print("to_bci ").println(block.end() == null ? -1 : block.end().bci());
@@ -158,6 +163,8 @@
         }
         if (block.isSubroutineEntry()) {
             out.print("\"sr\" ");
+            end("states");
+            end("states");
         }
         if (block.isBackwardBranchTarget()) {
             out.print("\"bb\" ");
@@ -202,73 +209,68 @@
      * @param block the block for which the frame state is to be printed
      */
     private void printState(BlockBegin block) {
-        begin("states");
+        begin("state");
 
         FrameState state = block.stateBefore();
-
-        do {
-            int stackSize = state.stackSize();
-            if (stackSize > 0) {
-                begin("stack");
-                out.print("size ").println(stackSize);
-                out.print("method \"").print(CiUtil.toLocation(state.scope().method, state.bci)).println('"');
-
-                int i = 0;
-                while (i < stackSize) {
-                    Value value = state.stackAt(i);
-                    out.disableIndentation();
-                    out.print(block.stateString(i, value));
-                    printOperand(value);
-                    out.println();
-                    out.enableIndentation();
-                    if (value == null) {
-                        i++;
-                    } else {
-                        i += value.kind.sizeInSlots();
-                    }
-                }
-                end("stack");
-            }
+        int stackSize = state.stackSize();
+        if (stackSize > 0) {
+            begin("stack");
+            out.print("size ").println(stackSize);
+            out.print("method \"").print(CiUtil.toLocation(state.method, state.bci)).println('"');
 
-            if (state.locksSize() > 0) {
-                begin("locks");
-                out.print("size ").println(state.locksSize());
-                out.print("method \"").print(CiUtil.toLocation(state.scope().method, state.bci)).println('"');
-
-                for (int i = 0; i < state.locksSize(); ++i) {
-                    Value value = state.lockAt(i);
-                    out.disableIndentation();
-                    out.print(block.stateString(i, value));
-                    printOperand(value);
-                    out.println();
-                    out.enableIndentation();
-                }
-                end("locks");
-            }
-
-            begin("locals");
-            out.print("size ").println(state.localsSize());
-            out.print("method \"").print(CiUtil.toLocation(state.scope().method, state.bci)).println('"');
             int i = 0;
-            while (i < state.localsSize()) {
-                Value value = state.localAt(i);
-                if (value != null) {
-                    out.disableIndentation();
-                    out.print(block.stateString(i, value));
-                    printOperand(value);
-                    out.println();
-                    out.enableIndentation();
-                    // also ignore illegal HiWords
-                    i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
+            while (i < stackSize) {
+                Value value = state.stackAt(i);
+                out.disableIndentation();
+                out.print(block.stateString(i, value));
+                printOperand(value);
+                out.println();
+                out.enableIndentation();
+                if (value == null) {
+                    i++;
                 } else {
-                    i++;
+                    i += value.kind.sizeInSlots();
                 }
             }
-            state = state.callerState();
-            end("locals");
-        } while (state != null);
+            end("stack");
+        }
+
+        if (state.locksSize() > 0) {
+            begin("locks");
+            out.print("size ").println(state.locksSize());
+            out.print("method \"").print(CiUtil.toLocation(state.method, state.bci)).println('"');
+
+            for (int i = 0; i < state.locksSize(); ++i) {
+                Value value = state.lockAt(i);
+                out.disableIndentation();
+                out.print(block.stateString(i, value));
+                printOperand(value);
+                out.println();
+                out.enableIndentation();
+            }
+            end("locks");
+        }
 
-        end("states");
+        begin("locals");
+        out.print("size ").println(state.localsSize());
+        out.print("method \"").print(CiUtil.toLocation(state.method, state.bci)).println('"');
+        int i = 0;
+        while (i < state.localsSize()) {
+            Value value = state.localAt(i);
+            if (value != null) {
+                out.disableIndentation();
+                out.print(block.stateString(i, value));
+                printOperand(value);
+                out.println();
+                out.enableIndentation();
+                // also ignore illegal HiWords
+                i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
+            } else {
+                i++;
+            }
+        }
+        end("locals");
+        end("state");
     }
 
     /**
@@ -280,49 +282,45 @@
         }
 
         StringBuilder buf = new StringBuilder();
-
-        do {
-            buf.append(CiUtil.toLocation(state.scope().method, state.bci));
-            buf.append('\n');
-            if (state.stackSize() > 0) {
-                int i = 0;
-                buf.append("stack: ");
-                while (i < state.stackSize()) {
-                    if (i == 0) {
-                        buf.append(' ');
-                    }
-                    Value value = state.stackAt(i);
-                    buf.append(stateValueToString(value, operandFmt)).append(' ');
-                    i++;
-                }
-                buf.append("\n");
-            }
-
-            if (state.locksSize() > 0) {
-                buf.append("locks: ");
-                for (int i = 0; i < state.locksSize(); ++i) {
-                    if (i == 0) {
-                        buf.append(' ');
-                    }
-                    Value value = state.lockAt(i);
-                    buf.append(stateValueToString(value, operandFmt)).append(' ');
-                }
-                buf.append("\n");
-            }
-
-            buf.append("locals: ");
+        buf.append(CiUtil.toLocation(state.method, state.bci));
+        buf.append('\n');
+        if (state.stackSize() > 0) {
             int i = 0;
-            while (i < state.localsSize()) {
+            buf.append("stack: ");
+            while (i < state.stackSize()) {
                 if (i == 0) {
                     buf.append(' ');
                 }
-                Value value = state.localAt(i);
+                Value value = state.stackAt(i);
                 buf.append(stateValueToString(value, operandFmt)).append(' ');
                 i++;
             }
             buf.append("\n");
-            state = state.callerState();
-        } while (state != null);
+        }
+
+        if (state.locksSize() > 0) {
+            buf.append("locks: ");
+            for (int i = 0; i < state.locksSize(); ++i) {
+                if (i == 0) {
+                    buf.append(' ');
+                }
+                Value value = state.lockAt(i);
+                buf.append(stateValueToString(value, operandFmt)).append(' ');
+            }
+            buf.append("\n");
+        }
+
+        buf.append("locals: ");
+        int i = 0;
+        while (i < state.localsSize()) {
+            if (i == 0) {
+                buf.append(' ');
+            }
+            Value value = state.localAt(i);
+            buf.append(stateValueToString(value, operandFmt)).append(' ');
+            i++;
+        }
+        buf.append("\n");
         return buf.toString();
     }
 

--- a/graal/GraalCompiler/src/com/sun/c1x/gen/LIRGenerator.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/gen/LIRGenerator.java	Fri Apr 29 13:19:17 2011 +0200
@@ -1283,17 +1283,9 @@
                     moveToPhi(resolver, curState.stackAt(index), suxState.stackAt(index));
                 }
 
-                // walk up the inlined scopes until locals match
-                while (curState.scope() != suxState.scope()) {
-                    curState = curState.callerState();
-                    assert curState != null : "scopes don't match up";
-                }
-
                 for (int index = 0; index < suxState.localsSize(); index++) {
                     moveToPhi(resolver, curState.localAt(index), suxState.localAt(index));
                 }
-
-                assert curState.scope().callerState == suxState.scope().callerState : "caller states must be equal";
                 resolver.dispose();
             }
         }
@@ -1390,26 +1382,20 @@
         }
         FrameState s = state;
         int bci = x.bci();
+        if (bci == Instruction.SYNCHRONIZATION_ENTRY_BCI) {
+            assert x instanceof ExceptionObject ||
+                   x instanceof Throw ||
+                   x instanceof MonitorEnter ||
+                   x instanceof MonitorExit : x + ", " + x.getClass();
+        }
 
-        while (s != null) {
-            IRScope scope = s.scope();
-            if (bci == Instruction.SYNCHRONIZATION_ENTRY_BCI) {
-                assert x instanceof ExceptionObject ||
-                       x instanceof Throw ||
-                       x instanceof MonitorEnter ||
-                       x instanceof MonitorExit : x + ", " + x.getClass();
-            }
-
-            for (int index = 0; index < s.localsSize(); index++) {
-                final Value value = s.localAt(index);
-                if (value != null) {
-                    if (!value.isIllegal()) {
-                        walkStateValue(value);
-                    }
+        for (int index = 0; index < s.localsSize(); index++) {
+            final Value value = s.localAt(index);
+            if (value != null) {
+                if (!value.isIllegal()) {
+                    walkStateValue(value);
                 }
             }
-            bci = scope.callerBCI();
-            s = s.callerState();
         }
     }
 

--- a/graal/GraalCompiler/src/com/sun/c1x/graph/GraphBuilder.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/graph/GraphBuilder.java	Fri Apr 29 13:19:17 2011 +0200
@@ -103,7 +103,7 @@
      * Builds the graph for a the specified {@code IRScope}.
      * @param scope the top IRScope
      */
-    public void build(IRScope scope) {
+    public void build() {
         RiMethod rootMethod = compilation.method;
 
         if (log != null) {
@@ -116,9 +116,9 @@
         BlockBegin startBlock = ir.startBlock;
 
         // 2. compute the block map and get the entrypoint(s)
-        BlockMap blockMap = compilation.getBlockMap(scope.method);
+        BlockMap blockMap = compilation.getBlockMap(rootMethod);
         BlockBegin stdEntry = blockMap.get(0);
-        pushRootScope(scope, blockMap, startBlock);
+        pushRootScope(rootMethod, blockMap, startBlock);
         MutableFrameState initialState = stateAtEntry(rootMethod);
         startBlock.mergeOrClone(initialState);
         BlockBegin syncHandler = null;
@@ -173,10 +173,10 @@
         stdEntry.mergeOrClone(stateAfter);
     }
 
-    void pushRootScope(IRScope scope, BlockMap blockMap, BlockBegin start) {
-        BytecodeStream stream = new BytecodeStream(scope.method.code());
-        RiConstantPool constantPool = compilation.runtime.getConstantPool(scope.method);
-        scopeData = new ScopeData(null, scope, blockMap, stream, constantPool);
+    void pushRootScope(RiMethod method, BlockMap blockMap, BlockBegin start) {
+        BytecodeStream stream = new BytecodeStream(method.code());
+        RiConstantPool constantPool = compilation.runtime.getConstantPool(method);
+        scopeData = new ScopeData(null, method, blockMap, stream, constantPool);
         curBlock = start;
     }
 
@@ -184,20 +184,8 @@
         return scopeData.hasHandler();
     }
 
-    public IRScope scope() {
-        return scopeData.scope;
-    }
-
-    public IRScope rootScope() {
-        IRScope root = scope();
-        while (root.caller != null) {
-            root = root.caller;
-        }
-        return root;
-    }
-
     public RiMethod method() {
-        return scopeData.scope.method;
+        return compilation.method;
     }
 
     public BytecodeStream stream() {
@@ -328,7 +316,7 @@
         // Also check parent jsrs (if any) at this time to see whether
         // they are using this local. We don't handle skipping over a
         // ret.
-        for (ScopeData cur = scopeData.parent; cur != null && cur.parsingJsr() && cur.scope == scope(); cur = cur.parent) {
+        for (ScopeData cur = scopeData.parent; cur != null && cur.parsingJsr(); cur = cur.parent) {
             if (cur.jsrEntryReturnAddressLocal() == index) {
                 throw new CiBailout("subroutine overwrites return address from previous subroutine");
             }
@@ -347,40 +335,21 @@
 
         assert stateBefore != null : "exception handler state must be available for " + x;
         FrameState state = stateBefore;
-        do {
-            assert curScopeData.scope == state.scope() : "scopes do not match";
-            assert bci == Instruction.SYNCHRONIZATION_ENTRY_BCI || bci == curScopeData.stream.currentBCI() : "invalid bci";
+        assert bci == Instruction.SYNCHRONIZATION_ENTRY_BCI || bci == curScopeData.stream.currentBCI() : "invalid bci";
 
-            // join with all potential exception handlers
-            List<ExceptionHandler> handlers = curScopeData.exceptionHandlers();
-            if (handlers != null) {
-                for (ExceptionHandler handler : handlers) {
-                    if (handler.covers(bci)) {
-                        // if the handler covers this bytecode index, add it to the list
-                        if (addExceptionHandler(exceptionHandlers, handler, curScopeData, state, scopeCount)) {
-                            // if the handler was a default handler, we are done
-                            return exceptionHandlers;
-                        }
+        // join with all potential exception handlers
+        List<ExceptionHandler> handlers = curScopeData.exceptionHandlers();
+        if (handlers != null) {
+            for (ExceptionHandler handler : handlers) {
+                if (handler.covers(bci)) {
+                    // if the handler covers this bytecode index, add it to the list
+                    if (addExceptionHandler(exceptionHandlers, handler, curScopeData, state, scopeCount)) {
+                        // if the handler was a default handler, we are done
+                        return exceptionHandlers;
                     }
                 }
             }
-            // pop the scope to the next IRScope level
-            // if parsing a JSR, skip scopes until the next IRScope level
-            IRScope curScope = curScopeData.scope;
-            while (curScopeData.parent != null && curScopeData.parent.scope == curScope) {
-                curScopeData = curScopeData.parent;
-            }
-            if (curScopeData.parent == null) {
-                // no more levels, done
-                break;
-            }
-            // there is another level, pop
-            state = state.callerState();
-            bci = curScopeData.scope.callerBCI();
-            curScopeData = curScopeData.parent;
-            scopeCount++;
-
-        } while (true);
+        }
 
         return exceptionHandlers;
     }
@@ -1108,7 +1077,7 @@
         }
         MonitorEnter monitorEnter = new MonitorEnter(x, lockAddress, lockNumber, null);
         appendWithoutOptimization(monitorEnter, bci);
-        curState.lock(scope(), x, lockNumber + 1);
+        curState.lock(ir, x, lockNumber + 1);
         monitorEnter.setStateAfter(curState.immutableCopy(bci));
         killMemoryMap(); // prevent any optimizations across synchronization
     }
@@ -1129,7 +1098,7 @@
     }
 
     void genJsr(int dest) {
-        for (ScopeData cur = scopeData; cur != null && cur.parsingJsr() && cur.scope == scope(); cur = cur.parent) {
+        for (ScopeData cur = scopeData; cur != null && cur.parsingJsr(); cur = cur.parent) {
             if (cur.jsrEntryBCI() == dest) {
                 // the jsr/ret pattern includes a recursive invocation
                 throw new CiBailout("recursive jsr/ret structure");
@@ -1333,9 +1302,9 @@
     }
 
     void pushScopeForJsr(BlockBegin jsrCont, int jsrStart) {
-        BytecodeStream stream = new BytecodeStream(scope().method.code());
+        BytecodeStream stream = new BytecodeStream(compilation.method.code());
         RiConstantPool constantPool = scopeData.constantPool;
-        ScopeData data = new ScopeData(scopeData, scope(), scopeData.blockMap, stream, constantPool, jsrStart);
+        ScopeData data = new ScopeData(scopeData, compilation.method, scopeData.blockMap, stream, constantPool, jsrStart);
         BlockBegin continuation = scopeData.continuation();
         data.setContinuation(continuation);
         if (continuation != null) {
@@ -1347,7 +1316,7 @@
     }
 
     MutableFrameState stateAtEntry(RiMethod method) {
-        MutableFrameState state = new MutableFrameState(scope(), -1, method.maxLocals(), method.maxStackSize());
+        MutableFrameState state = new MutableFrameState(method, -1, method.maxLocals(), method.maxStackSize());
         int index = 0;
         if (!isStatic(method.accessFlags())) {
             // add the receiver and assume it is non null
@@ -1521,7 +1490,7 @@
 
     private void traceState() {
         if (C1XOptions.TraceBytecodeParserLevel >= TRACELEVEL_STATE && !TTY.isSuppressed()) {
-            log.println(String.format("|   state [nr locals = %d, stack depth = %d, method = %s]", curState.localsSize(), curState.stackSize(), curState.scope().method));
+            log.println(String.format("|   state [nr locals = %d, stack depth = %d, method = %s]", curState.localsSize(), curState.stackSize(), method()));
             for (int i = 0; i < curState.localsSize(); ++i) {
                 Value value = curState.localAt(i);
                 log.println(String.format("|   local[%d] = %-8s : %s", i, value == null ? "bogus" : value.kind.javaName, value));

--- a/graal/GraalCompiler/src/com/sun/c1x/graph/IR.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/graph/IR.java	Fri Apr 29 13:19:17 2011 +0200
@@ -54,10 +54,7 @@
      */
     public BlockBegin osrEntryBlock;
 
-    /**
-     * The top IRScope.
-     */
-    public IRScope topScope;
+    private int maxLocks;
 
     /**
      * The linear-scan ordered list of blocks.
@@ -95,10 +92,8 @@
     }
 
     private void buildGraph() {
-        topScope = new IRScope(null, null, compilation.method, -1);
-
         // Graph builder must set the startBlock and the osrEntryBlock
-        new GraphBuilder(compilation, this).build(topScope);
+        new GraphBuilder(compilation, this).build();
         assert startBlock != null;
         verifyAndPrint("After graph building");
 
@@ -259,4 +254,23 @@
     public int numLoops() {
         return compilation.stats.loopCount;
     }
+
+    /**
+     * Updates the maximum number of locks held at any one time.
+     *
+     * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater
+     */
+    public void updateMaxLocks(int locks) {
+        if (locks > maxLocks) {
+            maxLocks = locks;
+        }
+    }
+
+    /**
+     * Gets the number of locks
+     * @return the number of locks
+     */
+    public final int maxLocks() {
+        return maxLocks;
+    }
 }

--- a/graal/GraalCompiler/src/com/sun/c1x/graph/ScopeData.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/graph/ScopeData.java	Fri Apr 29 13:19:17 2011 +0200
@@ -63,8 +63,8 @@
 
 
     final ScopeData parent;
-    // the IR scope
-    final IRScope scope;
+    //
+    final RiMethod method;
     // bci-to-block mapping
     final BlockMap blockMap;
     // the bytecode stream
@@ -132,9 +132,9 @@
      * @param stream the bytecode stream
      * @param constantPool the constant pool
      */
-    public ScopeData(ScopeData parent, IRScope scope, BlockMap blockMap, BytecodeStream stream, RiConstantPool constantPool) {
+    public ScopeData(ScopeData parent, RiMethod method, BlockMap blockMap, BytecodeStream stream, RiConstantPool constantPool) {
         this.parent = parent;
-        this.scope = scope;
+        this.method = method;
         this.blockMap = blockMap;
         this.stream = stream;
         this.constantPool = constantPool;
@@ -148,16 +148,16 @@
             if (parent.hasHandler()) {
                 flags |= HasHandler.mask;
             }
-            if (parent.noSafepoints() || scope.method.noSafepoints()) {
+            if (parent.noSafepoints() || method.noSafepoints()) {
                 flags |= NoSafepoints.mask;
             }
         } else {
             maxInlineSize = C1XOptions.MaximumInlineSize;
-            if (scope.method.noSafepoints()) {
+            if (method.noSafepoints()) {
                 flags |= NoSafepoints.mask;
             }
         }
-        RiExceptionHandler[] handlers = scope.method.exceptionHandlers();
+        RiExceptionHandler[] handlers = method.exceptionHandlers();
         if (handlers != null && handlers.length > 0) {
             exceptionHandlers = new ArrayList<ExceptionHandler>(handlers.length);
             for (RiExceptionHandler ch : handlers) {
@@ -179,16 +179,16 @@
      * @param constantPool the constant pool
      * @param jsrEntryBci the bytecode index of the entrypoint of the JSR
      */
-    public ScopeData(ScopeData parent, IRScope scope, BlockMap blockMap, BytecodeStream stream, RiConstantPool constantPool, int jsrEntryBci) {
+    public ScopeData(ScopeData parent, RiMethod method, BlockMap blockMap, BytecodeStream stream, RiConstantPool constantPool, int jsrEntryBci) {
         this.parent = parent;
-        this.scope = scope;
+        this.method = method;
         this.blockMap = blockMap;
         this.stream = stream;
         this.constantPool = constantPool;
         assert jsrEntryBci > 0 : "jsr cannot jump to BCI 0";
         assert parent != null : "jsr must have parent scope";
         this.jsrEntryBci = jsrEntryBci;
-        this.jsrDuplicatedBlocks = new BlockBegin[scope.method.code().length];
+        this.jsrDuplicatedBlocks = new BlockBegin[method.code().length];
         this.jsrRetAddrLocal = -1;
 
         maxInlineSize = (int) (C1XOptions.MaximumInlineRatio * parent.maxInlineSize());
@@ -271,15 +271,6 @@
     }
 
     /**
-     * Gets the size of the stack at the caller.
-     * @return the size of the stack
-     */
-    public int callerStackSize() {
-        FrameState state = scope.callerState;
-        return state == null ? 0 : state.stackSize();
-    }
-
-    /**
      * Gets the block continuation for this ScopeData.
      * @return the continuation
      */
@@ -502,9 +493,9 @@
     @Override
     public String toString() {
         if (parsingJsr()) {
-            return "jsr@" + jsrEntryBci + " data for " + scope.toString();
+            return "jsr@" + jsrEntryBci + " data for " + method.toString();
         } else {
-            return "data for " + scope.toString();
+            return "data for " + method.toString();
         }
 
     }

--- a/graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java	Fri Apr 29 13:19:17 2011 +0200
@@ -409,7 +409,7 @@
 
             if (C1XOptions.UseStackMapTableLiveness) {
                 // if a liveness map is available, use it to invalidate dead locals
-                CiBitMap[] livenessMap = newState.scope().method.livenessMap();
+                CiBitMap[] livenessMap = newState.method.livenessMap();
                 if (livenessMap != null && bci() >= 0) {
                     assert bci() < livenessMap.length;
                     CiBitMap liveness = livenessMap[bci()];
@@ -431,14 +431,6 @@
                 throw new CiBailout("stack or locks do not match");
             }
 
-            // while (existingState.scope() != newState.scope()) {
-            //     // XXX: original code is not sure if this is necessary
-            //     newState = newState.scope().callerState();
-            //     assert newState != null : "could not match scopes";
-            // }
-            // above code replaced with assert for the moment
-            assert existingState.scope() == newState.scope();
-
             assert existingState.localsSize() == newState.localsSize();
             assert existingState.stackSize() == newState.stackSize();
 
@@ -471,19 +463,10 @@
             newState.setupPhiForStack(this, i);
         }
         int localsSize = newState.localsSize();
-        CiBitMap requiresPhi = newState.scope().getStoresInLoops();
         for (int i = 0; i < localsSize; i++) {
             Value x = newState.localAt(i);
             if (x != null) {
-                if (requiresPhi != null) {
-                    if (requiresPhi.get(i) || x.kind.isDoubleWord() && requiresPhi.get(i + 1)) {
-                        // selectively do a phi
-                        newState.setupPhiForLocal(this, i);
-                    }
-                } else {
-                    // always setup a phi
-                    newState.setupPhiForLocal(this, i);
-                }
+                newState.setupPhiForLocal(this, i);
             }
         }
     }
@@ -792,19 +775,16 @@
                 }
             }
 
-            do {
-                for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
-                    Value value = state.localAt(i);
-                    hasPhisInLocals = isPhiAtBlock(value);
-                    // also ignore illegal HiWords
-                    if (value != null && !value.isIllegal()) {
-                        i += value.kind.sizeInSlots();
-                    } else {
-                        i++;
-                    }
+            for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
+                Value value = state.localAt(i);
+                hasPhisInLocals = isPhiAtBlock(value);
+                // also ignore illegal HiWords
+                if (value != null && !value.isIllegal()) {
+                    i += value.kind.sizeInSlots();
+                } else {
+                    i++;
                 }
-                state = state.callerState();
-            } while (state != null);
+            }
         }
 
         // print values in locals
@@ -813,21 +793,18 @@
             out.println("Locals:");
 
             FrameState state = stateBefore();
-            do {
-                int i = 0;
-                while (i < state.localsSize()) {
-                    Value value = state.localAt(i);
-                    if (value != null) {
-                        out.println(stateString(i, value));
-                        // also ignore illegal HiWords
-                        i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
-                    } else {
-                        i++;
-                    }
+            int i = 0;
+            while (i < state.localsSize()) {
+                Value value = state.localAt(i);
+                if (value != null) {
+                    out.println(stateString(i, value));
+                    // also ignore illegal HiWords
+                    i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
+                } else {
+                    i++;
                 }
-                out.println();
-                state = state.callerState();
-            } while (state != null);
+            }
+            out.println();
         }
 
         // print values on stack

--- a/graal/GraalCompiler/src/com/sun/c1x/ir/IRScope.java	Fri Apr 29 11:50:28 2011 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,130 +0,0 @@
-/*
- * Copyright (c) 2009, 2011, 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.sun.c1x.ir;
-
-import com.sun.c1x.value.*;
-import com.sun.cri.ci.*;
-import com.sun.cri.ri.*;
-
-/**
- * The {@code IRScope} class represents an inlining context in the compilation
- * of a method.
- *
- * @author Ben L. Titzer
- */
-public class IRScope {
-
-    public final IRScope caller;
-    public final RiMethod method;
-    public final int level;
-    CiCodePos callerCodePos;
-
-    /**
-     * The frame state at the call site of this scope's caller or {@code null}
-     * if this is not a nested scope.
-     */
-    public final FrameState callerState;
-
-    /**
-     * The maximum number of locks held in this scope at any one time
-     * (c.f. maxStack and maxLocals of the Code attribute in a class file).
-     */
-    int maxLocks;
-
-    CiBitMap storesInLoops;
-
-    public IRScope(IRScope caller, FrameState callerState, RiMethod method, int osrBCI) {
-        this.caller = caller;
-        this.callerState = callerState;
-        this.method = method;
-        this.level = caller == null ? 0 : 1 + caller.level;
-    }
-
-    /**
-     * Updates the maximum number of locks held in this scope at any one time.
-     *
-     * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} for this scope if it is greater
-     */
-    public void updateMaxLocks(int locks) {
-        if (locks > maxLocks) {
-            maxLocks = locks;
-        }
-    }
-
-    /**
-     * Gets the number of locks in this IR scope.
-     * @return the number of locks
-     */
-    public final int maxLocks() {
-        return maxLocks;
-    }
-
-    /**
-     * Gets the bytecode index of the call site that called this method.
-     * @return the call site's bytecode index
-     */
-    public final int callerBCI() {
-        return callerState == null ? -1 : callerState.bci;
-    }
-
-    /**
-     * Returns whether this IR scope is the top scope (i.e. has no caller).
-     * @return {@code true} if this inlining scope has no parent
-     */
-    public final boolean isTopScope() {
-        return caller == null;
-    }
-
-    /**
-     * Gets the phi bitmap for this IR scope. The phi bitmap stores
-     * whether a phi instruction is required for each local variable.
-     * @return the phi bitmap for this IR scope
-     */
-    public final CiBitMap getStoresInLoops() {
-        return storesInLoops;
-    }
-
-    public final void setStoresInLoops(CiBitMap storesInLoops) {
-        this.storesInLoops = storesInLoops;
-    }
-
-    @Override
-    public String toString() {
-        if (caller == null) {
-            return "root-scope: " + method;
-        } else {
-            return "inlined-scope: " + method + " [caller bci: " + callerState.bci + "]";
-        }
-    }
-
-    public CiCodePos callerCodePos() {
-        if (caller != null && callerCodePos == null) {
-            callerCodePos = caller.toCodePos(callerBCI());
-        }
-        return callerCodePos;
-    }
-
-    public CiCodePos toCodePos(int bci) {
-        return new CiCodePos(callerCodePos(), method, bci);
-    }
-}

--- a/graal/GraalCompiler/src/com/sun/c1x/value/FrameState.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/value/FrameState.java	Fri Apr 29 13:19:17 2011 +0200
@@ -62,7 +62,9 @@
      */
     protected final int maxLocals;
 
-    protected final IRScope scope;
+    //XXX temporary while removing IRScope
+    @Deprecated
+    public final RiMethod method;
 
     /**
      * The bytecode index to which this frame state applies. This will be {@code -1}
@@ -92,8 +94,8 @@
      * @param maxLocals maximum number of locals
      * @param maxStack maximum size of the stack
      */
-    public FrameState(IRScope irScope, int bci, int maxLocals, int maxStack) {
-        this.scope = irScope;
+    public FrameState(RiMethod method, int bci, int maxLocals, int maxStack) {
+        this.method = method;
         this.bci = bci;
         this.values = new Value[maxLocals + Math.max(maxStack, MINIMUM_STACK_SLOTS)];
         this.maxLocals = maxLocals;
@@ -111,7 +113,7 @@
      * @return a new frame state with the specified components
      */
     public MutableFrameState copy(int bci, boolean withLocals, boolean withStack, boolean withLocks) {
-        final MutableFrameState other = new MutableFrameState(scope, bci, localsSize(), maxStackSize());
+        final MutableFrameState other = new MutableFrameState(method, bci, localsSize(), maxStackSize());
         if (withLocals && withStack) {
             // fast path: use array copy
             int valuesSize = valuesSize();
@@ -176,15 +178,6 @@
     }
 
     /**
-     * Returns the inlining context associated with this frame state.
-     *
-     * @return the inlining context
-     */
-    public IRScope scope() {
-        return scope;
-    }
-
-    /**
      * Returns the size of the local variables.
      *
      * @return the size of the local variables
@@ -200,8 +193,9 @@
         return locks == null ? 0 : locks.size();
     }
 
+    @Deprecated
     public int totalLocksSize() {
-        return locksSize() + ((callerState() == null) ? 0 : callerState().totalLocksSize());
+        return locksSize();
     }
 
     /**
@@ -373,11 +367,6 @@
         return maxLocals + stackIndex;
     }
 
-    public final int callerStackSize() {
-        FrameState callerState = scope().callerState;
-        return callerState == null ? 0 : callerState.stackSize();
-    }
-
     public void checkPhis(BlockBegin block, FrameState other) {
         checkSize(other);
         final int max = valuesSize();
@@ -525,24 +514,21 @@
      * @param closure the closure to apply to each value
      */
     public static void valuesDo(FrameState state, ValueClosure closure) {
-        do {
-            final int max = state.valuesSize();
-            for (int i = 0; i < max; i++) {
-                if (state.values[i] != null) {
-                    Value newValue = closure.apply(state.values[i]);
-                    state.values[i] = newValue;
+        final int max = state.valuesSize();
+        for (int i = 0; i < max; i++) {
+            if (state.values[i] != null) {
+                Value newValue = closure.apply(state.values[i]);
+                state.values[i] = newValue;
+            }
+        }
+        if (state.locks != null) {
+            for (int i = 0; i < state.locks.size(); i++) {
+                Value instr = state.locks.get(i);
+                if (instr != null) {
+                    state.locks.set(i, closure.apply(instr));
                 }
             }
-            if (state.locks != null) {
-                for (int i = 0; i < state.locks.size(); i++) {
-                    Value instr = state.locks.get(i);
-                    if (instr != null) {
-                        state.locks.set(i, closure.apply(instr));
-                    }
-                }
-            }
-            state = state.callerState();
-        } while (state != null);
+        }
     }
 
     /**
@@ -558,95 +544,36 @@
      * @param proc the call back called to process each live value traversed
      */
     public final void forEachLiveStateValue(ValueProcedure proc) {
-        FrameState state = this;
-        while (state != null) {
-            final int max = state.valuesSize();
-            for (int i = 0; i < max; i++) {
-                Value value = state.values[i];
-                if (value != null) {
-                    proc.doValue(value);
-                }
-            }
-            state = state.callerState();
-        }
-    }
-
-    public static String toString(FrameState fs) {
-        StringBuilder sb = new StringBuilder();
-        String nl = String.format("%n");
-        while (fs != null) {
-            if (fs.scope == null) {
-                sb.append("<no method>").append(" [bci: ").append(fs.bci).append(']');
-                break;
-            } else {
-                CiUtil.appendLocation(sb, fs.scope.method, fs.bci).append(nl);
-                for (int i = 0; i < fs.localsSize(); ++i) {
-                    Value value = fs.localAt(i);
-                    sb.append(String.format("  local[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value));
-                }
-                for (int i = 0; i < fs.stackSize(); ++i) {
-                    Value value = fs.stackAt(i);
-                    sb.append(String.format("  stack[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value));
-                }
-                for (int i = 0; i < fs.locksSize(); ++i) {
-                    Value value = fs.lockAt(i);
-                    sb.append(String.format("  lock[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value));
-                }
-                fs = fs.callerState();
+        final int max = this.valuesSize();
+        for (int i = 0; i < max; i++) {
+            Value value = this.values[i];
+            if (value != null) {
+                proc.doValue(value);
             }
         }
-        return sb.toString();
     }
 
     @Override
     public String toString() {
-        return toString(this);
+        StringBuilder sb = new StringBuilder();
+        String nl = String.format("%n");
+        CiUtil.appendLocation(sb, this.method, this.bci).append(nl);
+        for (int i = 0; i < this.localsSize(); ++i) {
+            Value value = this.localAt(i);
+            sb.append(String.format("  local[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value));
+        }
+        for (int i = 0; i < this.stackSize(); ++i) {
+            Value value = this.stackAt(i);
+            sb.append(String.format("  stack[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value));
+        }
+        for (int i = 0; i < this.locksSize(); ++i) {
+            Value value = this.lockAt(i);
+            sb.append(String.format("  lock[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value));
+        }
+        return sb.toString();
     }
 
     public CiCodePos toCodePos() {
-        FrameState caller = callerState();
-        CiCodePos callerCodePos = null;
-        if (caller != null) {
-            callerCodePos = caller.toCodePos();
-        }
-        return new CiCodePos(callerCodePos, scope.method, bci);
-    }
-
-    /**
-     * Creates a new {@code MutableFrameState} corresponding to inlining the specified method into this point in this frame state.
-     * @param scope the IRScope representing the inlined method
-     * @return a new frame state representing the state at the beginning of inlining the specified method into this one
-     */
-    public MutableFrameState pushScope(IRScope scope) {
-        assert scope.caller == this.scope;
-        RiMethod method = scope.method;
-        return new MutableFrameState(scope, -1, method.maxLocals(), method.maxStackSize());
-    }
-
-    /**
-     * Creates a new {@code MutableFrameState} corresponding to the state upon returning from this inlined method into the outer
-     * IRScope.
-     * @return a new frame state representing the state at exit from this frame state
-     */
-    public MutableFrameState popScope() {
-        IRScope callingScope = scope.caller;
-        assert callingScope != null;
-        FrameState callerState = scope.callerState;
-        MutableFrameState res = new MutableFrameState(callingScope, bci, callerState.maxLocals, callerState.maxStackSize() + stackIndex);
-        System.arraycopy(callerState.values, 0, res.values, 0, callerState.values.length);
-        System.arraycopy(values, maxLocals, res.values, res.maxLocals + callerState.stackIndex, stackIndex);
-        res.stackIndex = callerState.stackIndex + stackIndex;
-        assert res.stackIndex >= 0;
-        res.replaceLocks(callerState);
-        return res;
-    }
-
-    /**
-     * Gets the caller frame state.
-     *
-     * @return the caller frame state or {@code null} if this is a top-level state
-     */
-    public FrameState callerState() {
-        return scope.callerState;
+        return new CiCodePos(null, method, bci);
     }
 }

--- a/graal/GraalCompiler/src/com/sun/c1x/value/MutableFrameState.java	Fri Apr 29 11:50:28 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/value/MutableFrameState.java	Fri Apr 29 13:19:17 2011 +0200
@@ -24,9 +24,11 @@
 
 import java.util.*;
 
+import com.sun.c1x.graph.*;
 import com.sun.c1x.ir.*;
 import com.sun.c1x.util.*;
 import com.sun.cri.ci.*;
+import com.sun.cri.ri.*;
 
 
 /**
@@ -43,8 +45,8 @@
  */
 public final class MutableFrameState extends FrameState {
 
-    public MutableFrameState(IRScope irScope, int bci, int maxLocals, int maxStack) {
-        super(irScope, bci, maxLocals, maxStack);
+    public MutableFrameState(RiMethod method, int bci, int maxLocals, int maxStack) {
+        super(method, bci, maxLocals, maxStack);
     }
 
     /**
@@ -328,12 +330,12 @@
      * @param scope the IRScope in which this locking operation occurs
      * @param obj the object being locked
      */
-    public void lock(IRScope scope, Value obj, int totalNumberOfLocks) {
+    public void lock(IR ir, Value obj, int totalNumberOfLocks) {
         if (locks == null) {
             locks = new ArrayList<Value>(4);
         }
         locks.add(obj);
-        scope.updateMaxLocks(totalNumberOfLocks);
+        ir.updateMaxLocks(totalNumberOfLocks);
     }
 
     /**