All passes now run on demand - no eager runs on nested closures.

* This should reduce memory usage + improve perf. marginally
  in some cases.

Author: subbuss

core/src/main/java/org/jruby/ir/passes/AddCallProtocolInstructions.java

@@ -110,10 +110,6 @@ public Object execute(IRScope scope, Object... data) {
             scope.setExplicitCallProtocolFlag();
         }
 
-        // FIXME: Useless for now
-        // Run on all nested closures.
-        for (IRClosure c: scope.getClosures()) run(c, false, true);
-
         // LVA information is no longer valid after the pass
         // FIXME: Grrr ... this seems broken to have to create a new object to invalidate
         (new LiveVariableAnalysis()).invalidate(scope);

core/src/main/java/org/jruby/ir/passes/AddLocalVarLoadStoreInstructions.java

@@ -59,11 +59,6 @@ public Object execute(IRScope s, Object... data) {
                 for (Instr i: b.getInstrs()) i.renameVars(varRenameMap);
             }
 
-            // Run on all nested closures.
-            //
-            // In the current implementation, nested scopes are processed independently (unlike Live Variable Analysis)
-            for (IRClosure c: s.getClosures()) run(c, false, true);
-
             // LVA information is no longer valid after this pass
             // FIXME: Grrr ... this seems broken to have to create a new object to invalidate
             (new LiveVariableAnalysis()).invalidate(s);

core/src/main/java/org/jruby/ir/passes/DeadCodeElimination.java

@@ -23,10 +23,6 @@ public List<Class<? extends CompilerPass>> getDependencies() {
     public Object execute(IRScope scope, Object... data) {
         ((LiveVariablesProblem) data[0]).markDeadInstructions();
 
-        for (IRClosure cl: scope.getClosures()) {
-            run(cl, false, true);
-        }
-
         return true;
     }
 }

core/src/main/java/org/jruby/ir/passes/EnsureTempsAssigned.java

@@ -48,10 +48,5 @@ private void processCFG(CFG cfg) {
                 bb.getInstrs().add(index++, new CopyInstr(name, first));
             }
         }
-
-        // recurse
-        for (IRScope childScope : cfg.getScope().getClosures()) {
-            run(childScope, false, true);
-        }
     }
 }

core/src/main/java/org/jruby/ir/passes/LiveVariableAnalysis.java

@@ -59,11 +59,6 @@ private void collectNonLocalDirtyVars(IRClosure cl, Set<LocalVariable> vars, int
 
     @Override
     public Object execute(IRScope scope, Object... data) {
-        // Should never be invoked directly on IRClosures
-        // if (scope instanceof IRClosure && !(scope instanceof IREvalScript)) {
-        //     System.out.println("Hmm .. should not run lvp directly on closure scope: " + scope);
-        // }
-
         // Make sure flags are computed
         scope.computeScopeFlags();
 

core/src/main/java/org/jruby/ir/passes/LocalOptimizationPass.java

@@ -18,12 +18,6 @@ public String getLabel() {
 
     @Override
     public Object execute(IRScope s, Object... data) {
-        /*  FIXME: Ultimately we want to just delete this snippet but is left here so we can debug lifecycle issues with compiler passes
-        for (BasicBlock b: s.getCFG().getBasicBlocks()) {
-            runLocalOptsOnInstrList(s, b.getInstrs().listIterator(), false);
-        }
-        */
-
         // SSS FIXME: What is this about? 
         // Why 'Only after running local opts'? Figure out and document.
         //

core/src/main/java/org/jruby/ir/passes/OptimizeDelegationPass.java

@@ -18,9 +18,15 @@ public String getLabel() {
 
     @Override
     public Object execute(IRScope s, Object... data) {
+        /**
+         * SSS FIXME: too late at night to think straight if this
+         * is required to run on all nested scopes or not. Doesn't
+         * look like it, but leaving behind in case it is.
+         *
         for (IRClosure c: s.getClosures()) {
             run(c, false, true);
         }
+         **/
 
         if (s.getFlags().contains(IRFlags.BINDING_HAS_ESCAPED)) return null;
         if (!s.getFlags().contains(IRFlags.RECEIVES_CLOSURE_ARG)) return null;

core/src/main/java/org/jruby/ir/passes/OptimizeDynScopesPass.java

@@ -126,6 +126,9 @@ public Object execute(IRScope scope, Object... data) {
         }
 
         eliminateLocalVars(scope);
+
+        // SSS FIXME: Why null? Return a non-null value so that we don't
+        // run this repeatedly on the same scope.
         return null;
     }