Add a flag to the ARM version of new space allocation in generated code

The flag SIZE_IN_WORDS indicate that the requested size is in words and not in bytes, The default is to specify the size in bytes.
Review URL: http://codereview.chromium.org/2047002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4617 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/builtins-arm.cc

@@ -107,7 +107,7 @@ static void AllocateEmptyJSArray(MacroAssembler* masm,
   // Allocate the JSArray object together with space for a fixed array with the
   // requested elements.
   int size = JSArray::kSize + FixedArray::SizeFor(initial_capacity);
-  __ AllocateInNewSpace(size / kPointerSize,
+  __ AllocateInNewSpace(size,
                         result,
                         scratch2,
                         scratch3,
@@ -191,7 +191,7 @@ static void AllocateJSArray(MacroAssembler* masm,
   // keeps the code below free of special casing for the empty array.
   int size = JSArray::kSize +
              FixedArray::SizeFor(JSArray::kPreallocatedArrayElements);
-  __ AllocateInNewSpace(size / kPointerSize,
+  __ AllocateInNewSpace(size,
                         result,
                         elements_array_end,
                         scratch1,
@@ -208,12 +208,13 @@ static void AllocateJSArray(MacroAssembler* masm,
   __ add(elements_array_end,
          elements_array_end,
          Operand(array_size, ASR, kSmiTagSize));
-  __ AllocateInNewSpace(elements_array_end,
-                        result,
-                        scratch1,
-                        scratch2,
-                        gc_required,
-                        TAG_OBJECT);
+  __ AllocateInNewSpace(
+      elements_array_end,
+      result,
+      scratch1,
+      scratch2,
+      gc_required,
+      static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
 
   // Allocated the JSArray. Now initialize the fields except for the elements
   // array.
@@ -561,7 +562,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // r2: initial map
     // r7: undefined
     __ ldrb(r3, FieldMemOperand(r2, Map::kInstanceSizeOffset));
-    __ AllocateInNewSpace(r3, r4, r5, r6, &rt_call, NO_ALLOCATION_FLAGS);
+    __ AllocateInNewSpace(r3, r4, r5, r6, &rt_call, SIZE_IN_WORDS);
 
     // Allocated the JSObject, now initialize the fields. Map is set to initial
     // map and properties and elements are set to empty fixed array.
@@ -632,12 +633,13 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // r5: start of next object
     // r7: undefined
     __ add(r0, r3, Operand(FixedArray::kHeaderSize / kPointerSize));
-    __ AllocateInNewSpace(r0,
-                          r5,
-                          r6,
-                          r2,
-                          &undo_allocation,
-                          RESULT_CONTAINS_TOP);
+    __ AllocateInNewSpace(
+        r0,
+        r5,
+        r6,
+        r2,
+        &undo_allocation,
+        static_cast<AllocationFlags>(RESULT_CONTAINS_TOP | SIZE_IN_WORDS));
 
     // Initialize the FixedArray.
     // r1: constructor

src/arm/codegen-arm.cc

@@ -4414,12 +4414,13 @@ void CodeGenerator::GenerateRegExpConstructResult(ZoneList<Expression*>* args) {
         (JSRegExpResult::kSize + FixedArray::kHeaderSize) / kPointerSize;
     __ mov(r5, Operand(r1, LSR, kSmiTagSize + kSmiShiftSize));
     __ add(r2, r5, Operand(objects_size));
-    __ AllocateInNewSpace(r2,  // In: Size, in words.
-                          r0,  // Out: Start of allocation (tagged).
-                          r3,  // Scratch register.
-                          r4,  // Scratch register.
-                          &slowcase,
-                          TAG_OBJECT);
+    __ AllocateInNewSpace(
+        r2,  // In: Size, in words.
+        r0,  // Out: Start of allocation (tagged).
+        r3,  // Scratch register.
+        r4,  // Scratch register.
+        &slowcase,
+        static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
     // r0: Start of allocated area, object-tagged.
     // r1: Number of elements in array, as smi.
     // r5: Number of elements, untagged.
@@ -5867,7 +5868,7 @@ void FastNewClosureStub::Generate(MacroAssembler* masm) {
   __ pop(r3);
 
   // Attempt to allocate new JSFunction in new space.
-  __ AllocateInNewSpace(JSFunction::kSize / kPointerSize,
+  __ AllocateInNewSpace(JSFunction::kSize,
                         r0,
                         r1,
                         r2,
@@ -5908,7 +5909,7 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
   int length = slots_ + Context::MIN_CONTEXT_SLOTS;
 
   // Attempt to allocate the context in new space.
-  __ AllocateInNewSpace(length + (FixedArray::kHeaderSize / kPointerSize),
+  __ AllocateInNewSpace(FixedArray::SizeFor(length),
                         r0,
                         r1,
                         r2,
@@ -5976,7 +5977,7 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
 
   // Allocate both the JS array and the elements array in one big
   // allocation. This avoids multiple limit checks.
-  __ AllocateInNewSpace(size / kPointerSize,
+  __ AllocateInNewSpace(size,
                         r0,
                         r1,
                         r2,
@@ -8406,8 +8407,7 @@ void ArgumentsAccessStub::GenerateNewObject(MacroAssembler* masm) {
   __ str(r3, MemOperand(sp, 1 * kPointerSize));
 
   // Try the new space allocation. Start out with computing the size
-  // of the arguments object and the elements array (in words, not
-  // bytes because AllocateInNewSpace expects words).
+  // of the arguments object and the elements array in words.
   Label add_arguments_object;
   __ bind(&try_allocate);
   __ cmp(r1, Operand(0));
@@ -8418,7 +8418,13 @@ void ArgumentsAccessStub::GenerateNewObject(MacroAssembler* masm) {
   __ add(r1, r1, Operand(Heap::kArgumentsObjectSize / kPointerSize));
 
   // Do the allocation of both objects in one go.
-  __ AllocateInNewSpace(r1, r0, r2, r3, &runtime, TAG_OBJECT);
+  __ AllocateInNewSpace(
+      r1,
+      r0,
+      r2,
+      r3,
+      &runtime,
+      static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
 
   // Get the arguments boilerplate from the current (global) context.
   int offset = Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX);

src/arm/macro-assembler-arm.cc

@@ -933,6 +933,12 @@ void MacroAssembler::AllocateInNewSpace(int object_size,
   ASSERT(!result.is(scratch1));
   ASSERT(!scratch1.is(scratch2));
 
+  // Make object size into bytes.
+  if ((flags & SIZE_IN_WORDS) != 0) {
+    object_size *= kPointerSize;
+  }
+  ASSERT_EQ(0, object_size & kObjectAlignmentMask);
+
   // Load address of new object into result and allocation top address into
   // scratch1.
   ExternalReference new_space_allocation_top =
@@ -955,23 +961,16 @@ void MacroAssembler::AllocateInNewSpace(int object_size,
       ExternalReference::new_space_allocation_limit_address();
   mov(scratch2, Operand(new_space_allocation_limit));
   ldr(scratch2, MemOperand(scratch2));
-  add(result, result, Operand(object_size * kPointerSize));
+  add(result, result, Operand(object_size));
   cmp(result, Operand(scratch2));
   b(hi, gc_required);
-
-  // Update allocation top. result temporarily holds the new top.
-  if (FLAG_debug_code) {
-    tst(result, Operand(kObjectAlignmentMask));
-    Check(eq, "Unaligned allocation in new space");
-  }
   str(result, MemOperand(scratch1));
 
   // Tag and adjust back to start of new object.
   if ((flags & TAG_OBJECT) != 0) {
-    sub(result, result, Operand((object_size * kPointerSize) -
-                                kHeapObjectTag));
+    sub(result, result, Operand(object_size - kHeapObjectTag));
   } else {
-    sub(result, result, Operand(object_size * kPointerSize));
+    sub(result, result, Operand(object_size));
   }
 }
 
@@ -1008,7 +1007,11 @@ void MacroAssembler::AllocateInNewSpace(Register object_size,
       ExternalReference::new_space_allocation_limit_address();
   mov(scratch2, Operand(new_space_allocation_limit));
   ldr(scratch2, MemOperand(scratch2));
-  add(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+  if ((flags & SIZE_IN_WORDS) != 0) {
+    add(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+  } else {
+    add(result, result, Operand(object_size));
+  }
   cmp(result, Operand(scratch2));
   b(hi, gc_required);
 
@@ -1020,7 +1023,11 @@ void MacroAssembler::AllocateInNewSpace(Register object_size,
   str(result, MemOperand(scratch1));
 
   // Adjust back to start of new object.
-  sub(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+  if ((flags & SIZE_IN_WORDS) != 0) {
+    sub(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+  } else {
+    sub(result, result, Operand(object_size));
+  }
 
   // Tag object if requested.
   if ((flags & TAG_OBJECT) != 0) {
@@ -1061,10 +1068,7 @@ void MacroAssembler::AllocateTwoByteString(Register result,
   mov(scratch1, Operand(length, LSL, 1));  // Length in bytes, not chars.
   add(scratch1, scratch1,
       Operand(kObjectAlignmentMask + SeqTwoByteString::kHeaderSize));
-  // AllocateInNewSpace expects the size in words, so we can round down
-  // to kObjectAlignment and divide by kPointerSize in the same shift.
-  ASSERT_EQ(kPointerSize, kObjectAlignmentMask + 1);
-  mov(scratch1, Operand(scratch1, ASR, kPointerSizeLog2));
+  and_(scratch1, scratch1, Operand(~kObjectAlignmentMask));
 
   // Allocate two-byte string in new space.
   AllocateInNewSpace(scratch1,
@@ -1095,10 +1099,7 @@ void MacroAssembler::AllocateAsciiString(Register result,
   ASSERT(kCharSize == 1);
   add(scratch1, length,
       Operand(kObjectAlignmentMask + SeqAsciiString::kHeaderSize));
-  // AllocateInNewSpace expects the size in words, so we can round down
-  // to kObjectAlignment and divide by kPointerSize in the same shift.
-  ASSERT_EQ(kPointerSize, kObjectAlignmentMask + 1);
-  mov(scratch1, Operand(scratch1, ASR, kPointerSizeLog2));
+  and_(scratch1, scratch1, Operand(~kObjectAlignmentMask));
 
   // Allocate ASCII string in new space.
   AllocateInNewSpace(scratch1,
@@ -1122,7 +1123,7 @@ void MacroAssembler::AllocateTwoByteConsString(Register result,
                                                Register scratch1,
                                                Register scratch2,
                                                Label* gc_required) {
-  AllocateInNewSpace(ConsString::kSize / kPointerSize,
+  AllocateInNewSpace(ConsString::kSize,
                      result,
                      scratch1,
                      scratch2,
@@ -1142,7 +1143,7 @@ void MacroAssembler::AllocateAsciiConsString(Register result,
                                              Register scratch1,
                                              Register scratch2,
                                              Label* gc_required) {
-  AllocateInNewSpace(ConsString::kSize / kPointerSize,
+  AllocateInNewSpace(ConsString::kSize,
                      result,
                      scratch1,
                      scratch2,
@@ -1556,7 +1557,7 @@ void MacroAssembler::AllocateHeapNumber(Register result,
                                         Label* gc_required) {
   // Allocate an object in the heap for the heap number and tag it as a heap
   // object.
-  AllocateInNewSpace(HeapNumber::kSize / kPointerSize,
+  AllocateInNewSpace(HeapNumber::kSize,
                      result,
                      scratch1,
                      scratch2,

src/arm/macro-assembler-arm.h

@@ -52,6 +52,21 @@ enum InvokeJSFlags {
 };
 
 
+// Flags used for the AllocateInNewSpace functions.
+enum AllocationFlags {
+  // No special flags.
+  NO_ALLOCATION_FLAGS = 0,
+  // Return the pointer to the allocated already tagged as a heap object.
+  TAG_OBJECT = 1 << 0,
+  // The content of the result register already contains the allocation top in
+  // new space.
+  RESULT_CONTAINS_TOP = 1 << 1,
+  // Specify that the requested size of the space to allocate is specified in
+  // words instead of bytes.
+  SIZE_IN_WORDS = 1 << 2
+};
+
+
 // MacroAssembler implements a collection of frequently used macros.
 class MacroAssembler: public Assembler {
  public:

src/arm/stub-cache-arm.cc

@@ -2060,7 +2060,7 @@ Object* ConstructStubCompiler::CompileConstructStub(
                         r5,
                         r6,
                         &generic_stub_call,
-                        NO_ALLOCATION_FLAGS);
+                        SIZE_IN_WORDS);
 
   // Allocated the JSObject, now initialize the fields. Map is set to initial
   // map and properties and elements are set to empty fixed array.

src/ia32/macro-assembler-ia32.h

@@ -33,6 +33,17 @@
 namespace v8 {
 namespace internal {
 
+// Flags used for the AllocateInNewSpace functions.
+enum AllocationFlags {
+  // No special flags.
+  NO_ALLOCATION_FLAGS = 0,
+  // Return the pointer to the allocated already tagged as a heap object.
+  TAG_OBJECT = 1 << 0,
+  // The content of the result register already contains the allocation top in
+  // new space.
+  RESULT_CONTAINS_TOP = 1 << 1
+};
+
 // Convenience for platform-independent signatures.  We do not normally
 // distinguish memory operands from other operands on ia32.
 typedef Operand MemOperand;

src/macro-assembler.h

@@ -50,17 +50,6 @@ enum HandlerType {
 };
 
 
-// Flags used for the AllocateInNewSpace functions.
-enum AllocationFlags {
-  // No special flags.
-  NO_ALLOCATION_FLAGS = 0,
-  // Return the pointer to the allocated already tagged as a heap object.
-  TAG_OBJECT = 1 << 0,
-  // The content of the result register already contains the allocation top in
-  // new space.
-  RESULT_CONTAINS_TOP = 1 << 1
-};
-
 // Invalid depth in prototype chain.
 const int kInvalidProtoDepth = -1;
 

src/x64/macro-assembler-x64.h

@@ -33,6 +33,17 @@
 namespace v8 {
 namespace internal {
 
+// Flags used for the AllocateInNewSpace functions.
+enum AllocationFlags {
+  // No special flags.
+  NO_ALLOCATION_FLAGS = 0,
+  // Return the pointer to the allocated already tagged as a heap object.
+  TAG_OBJECT = 1 << 0,
+  // The content of the result register already contains the allocation top in
+  // new space.
+  RESULT_CONTAINS_TOP = 1 << 1
+};
+
 // Default scratch register used by MacroAssembler (and other code that needs
 // a spare register). The register isn't callee save, and not used by the
 // function calling convention.