MIPS: Adapt Danno's Track Allocation Info idea to fast literals.

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index 9f0d535416c6c8c3c04b2c3bc63ed94f067b690a..e920abf82c9d5d696f59870277276ffd598594d9 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -343,6 +343,7 @@ static void GenerateFastCloneShallowArrayCommon(
     MacroAssembler* masm,
     int length,
     FastCloneShallowArrayStub::Mode mode,
+    AllocationSiteInfoMode allocation_site_info_mode,
     Label* fail) {
   // Registers on entry:
   // a3: boilerplate literal array.
@@ -355,7 +356,12 @@ static void GenerateFastCloneShallowArrayCommon(
         ? FixedDoubleArray::SizeFor(length)
         : FixedArray::SizeFor(length);
   }
-  int size = JSArray::kSize + elements_size;
+  int size = JSArray::kSize;
+  int allocation_info_start = size;
+  if (allocation_site_info_mode == TRACK_ALLOCATION_SITE_INFO) {
+    size += AllocationSiteInfo::kSize;
+  }
+  size += elements_size;
 
   // Allocate both the JS array and the elements array in one big
   // allocation. This avoids multiple limit checks.
@@ -366,6 +372,13 @@ static void GenerateFastCloneShallowArrayCommon(
                         fail,
                         TAG_OBJECT);
 
+  if (allocation_site_info_mode == TRACK_ALLOCATION_SITE_INFO) {
+    __ li(a2, Operand(Handle<Map>(masm->isolate()->heap()->
+                                   allocation_site_info_map())));
+    __ sw(a2, FieldMemOperand(v0, allocation_info_start));
+    __ sw(a3, FieldMemOperand(v0, allocation_info_start + kPointerSize));
+  }
+
   // Copy the JS array part.
   for (int i = 0; i < JSArray::kSize; i += kPointerSize) {
     if ((i != JSArray::kElementsOffset) || (length == 0)) {
@@ -378,7 +391,11 @@ static void GenerateFastCloneShallowArrayCommon(
     // Get hold of the elements array of the boilerplate and setup the
     // elements pointer in the resulting object.
     __ lw(a3, FieldMemOperand(a3, JSArray::kElementsOffset));
-    __ Addu(a2, v0, Operand(JSArray::kSize));
+    if (allocation_site_info_mode == TRACK_ALLOCATION_SITE_INFO) {
+      __ Addu(a2, v0, Operand(JSArray::kSize + AllocationSiteInfo::kSize));
+    } else {
+      __ Addu(a2, v0, Operand(JSArray::kSize));
+    }
     __ sw(a2, FieldMemOperand(v0, JSArray::kElementsOffset));
 
     // Copy the elements array.
@@ -407,6 +424,12 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
   __ Branch(&slow_case, eq, a3, Operand(t1));
 
   FastCloneShallowArrayStub::Mode mode = mode_;
+  AllocationSiteInfoMode allocation_site_info_mode =
+      DONT_TRACK_ALLOCATION_SITE_INFO;
+  if (mode == CLONE_ANY_ELEMENTS_WITH_ALLOCATION_SITE_INFO) {
+    mode = CLONE_ANY_ELEMENTS;
+    allocation_site_info_mode = TRACK_ALLOCATION_SITE_INFO;
+  }
   if (mode == CLONE_ANY_ELEMENTS) {
     Label double_elements, check_fast_elements;
     __ lw(v0, FieldMemOperand(a3, JSArray::kElementsOffset));
@@ -414,7 +437,9 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     __ LoadRoot(t1, Heap::kFixedCOWArrayMapRootIndex);
     __ Branch(&check_fast_elements, ne, v0, Operand(t1));
     GenerateFastCloneShallowArrayCommon(masm, 0,
-                                        COPY_ON_WRITE_ELEMENTS, &slow_case);
+                                        COPY_ON_WRITE_ELEMENTS,
+                                        allocation_site_info_mode,
+                                        &slow_case);
     // Return and remove the on-stack parameters.
     __ DropAndRet(3);
 
@@ -422,7 +447,9 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     __ LoadRoot(t1, Heap::kFixedArrayMapRootIndex);
     __ Branch(&double_elements, ne, v0, Operand(t1));
     GenerateFastCloneShallowArrayCommon(masm, length_,
-                                        CLONE_ELEMENTS, &slow_case);
+                                        CLONE_ELEMENTS,
+                                        allocation_site_info_mode,
+                                        &slow_case);
     // Return and remove the on-stack parameters.
     __ DropAndRet(3);
 
@@ -453,7 +480,8 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     __ pop(a3);
   }
 
-  GenerateFastCloneShallowArrayCommon(masm, length_, mode, &slow_case);
+  GenerateFastCloneShallowArrayCommon(masm, length_, mode,
+                                      allocation_site_info_mode, &slow_case);
 
   // Return and remove the on-stack parameters.
   __ DropAndRet(3);