Revert #1091 Remove unboxed object code phase 1 + extras.

This should be the last code backout for this. merging this branch
should get us back to the way we were (+ additional code changes for
later changes) as fasr as the unused unboxed code is concerned.

1 files changed, 112 insertions, 0 deletions

diff --git a/js/src/jit/ScalarReplacement.cpp b/js/src/jit/ScalarReplacement.cpp
index 2065c0371..4614b2162 100644
--- a/js/src/jit/ScalarReplacement.cpp
+++ b/js/src/jit/ScalarReplacement.cpp
@@ -13,6 +13,7 @@
 #include "jit/MIR.h"
 #include "jit/MIRGenerator.h"
 #include "jit/MIRGraph.h"
+#include "vm/UnboxedObject.h"
 
 #include "jsobjinlines.h"
 
@@ -182,6 +183,25 @@ IsObjectEscaped(MInstruction* ins, JSObject* objDefault)
             JitSpewDef(JitSpew_Escape, "is escaped by\n", def);
             return true;
 
+          case MDefinition::Op_LoadUnboxedScalar:
+          case MDefinition::Op_StoreUnboxedScalar:
+          case MDefinition::Op_LoadUnboxedObjectOrNull:
+          case MDefinition::Op_StoreUnboxedObjectOrNull:
+          case MDefinition::Op_LoadUnboxedString:
+          case MDefinition::Op_StoreUnboxedString:
+            // Not escaped if it is the first argument.
+            if (def->indexOf(*i) != 0) {
+                JitSpewDef(JitSpew_Escape, "is escaped by\n", def);
+                return true;
+            }
+
+            if (!def->getOperand(1)->isConstant()) {
+                JitSpewDef(JitSpew_Escape, "is addressed with unknown index\n", def);
+                return true;
+            }
+
+            break;
+
           case MDefinition::Op_PostWriteBarrier:
             break;
 
@@ -285,6 +305,12 @@ class ObjectMemoryView : public MDefinitionVisitorDefaultNoop
     void visitGuardShape(MGuardShape* ins);
     void visitFunctionEnvironment(MFunctionEnvironment* ins);
     void visitLambda(MLambda* ins);
+    void visitStoreUnboxedScalar(MStoreUnboxedScalar* ins);
+    void visitLoadUnboxedScalar(MLoadUnboxedScalar* ins);
+    void visitStoreUnboxedObjectOrNull(MStoreUnboxedObjectOrNull* ins);
+    void visitLoadUnboxedObjectOrNull(MLoadUnboxedObjectOrNull* ins);
+    void visitStoreUnboxedString(MStoreUnboxedString* ins);
+    void visitLoadUnboxedString(MLoadUnboxedString* ins);
 
   private:
     void storeOffset(MInstruction* ins, size_t offset, MDefinition* value);
@@ -630,6 +656,21 @@ ObjectMemoryView::visitLambda(MLambda* ins)
     ins->setIncompleteObject();
 }
 
+static size_t
+GetOffsetOf(MDefinition* index, size_t width, int32_t baseOffset)
+{
+    int32_t idx = index->toConstant()->toInt32();
+    MOZ_ASSERT(idx >= 0);
+    MOZ_ASSERT(baseOffset >= 0 && size_t(baseOffset) >= UnboxedPlainObject::offsetOfData());
+    return idx * width + baseOffset - UnboxedPlainObject::offsetOfData();
+}
+
+static size_t
+GetOffsetOf(MDefinition* index, Scalar::Type type, int32_t baseOffset)
+{
+    return GetOffsetOf(index, Scalar::byteSize(type), baseOffset);
+}
+
 void
 ObjectMemoryView::storeOffset(MInstruction* ins, size_t offset, MDefinition* value)
 {
@@ -659,6 +700,77 @@ ObjectMemoryView::loadOffset(MInstruction* ins, size_t offset)
     ins->block()->discard(ins);
 }
 
+void
+ObjectMemoryView::visitStoreUnboxedScalar(MStoreUnboxedScalar* ins)
+{
+    // Skip stores made on other objects.
+    if (ins->elements() != obj_)
+        return;
+
+    size_t offset = GetOffsetOf(ins->index(), ins->storageType(), ins->offsetAdjustment());
+    storeOffset(ins, offset, ins->value());
+}
+
+void
+ObjectMemoryView::visitLoadUnboxedScalar(MLoadUnboxedScalar* ins)
+{
+    // Skip loads made on other objects.
+    if (ins->elements() != obj_)
+        return;
+
+    // Replace load by the slot value.
+    size_t offset = GetOffsetOf(ins->index(), ins->storageType(), ins->offsetAdjustment());
+    loadOffset(ins, offset);
+}
+
+void
+ObjectMemoryView::visitStoreUnboxedObjectOrNull(MStoreUnboxedObjectOrNull* ins)
+{
+    // Skip stores made on other objects.
+    if (ins->elements() != obj_)
+        return;
+
+    // Clone the state and update the slot value.
+    size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
+    storeOffset(ins, offset, ins->value());
+}
+
+void
+ObjectMemoryView::visitLoadUnboxedObjectOrNull(MLoadUnboxedObjectOrNull* ins)
+{
+    // Skip loads made on other objects.
+    if (ins->elements() != obj_)
+        return;
+
+    // Replace load by the slot value.
+    size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
+    loadOffset(ins, offset);
+}
+
+void
+ObjectMemoryView::visitStoreUnboxedString(MStoreUnboxedString* ins)
+{
+    // Skip stores made on other objects.
+    if (ins->elements() != obj_)
+        return;
+
+    // Clone the state and update the slot value.
+    size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
+    storeOffset(ins, offset, ins->value());
+}
+
+void
+ObjectMemoryView::visitLoadUnboxedString(MLoadUnboxedString* ins)
+{
+    // Skip loads made on other objects.
+    if (ins->elements() != obj_)
+        return;
+
+    // Replace load by the slot value.
+    size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
+    loadOffset(ins, offset);
+}
+
 static bool
 IndexOf(MDefinition* ins, int32_t* res)
 {