Add ia32 FastCloneShallowArrayStub that copies all boilerplate kinds.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 23bea4f8568ce2cebeccf8212be82343e75e4d29..62e59737923bed6cf04de1a8e9de3a7c32d1bd16 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -231,70 +231,36 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
 }
 
 
-void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
-  // Stack layout on entry:
-  //
-  // [esp + kPointerSize]: constant elements.
-  // [esp + (2 * kPointerSize)]: literal index.
-  // [esp + (3 * kPointerSize)]: literals array.
+static void GenerateFastCloneShallowArrayCommon(
+    MacroAssembler* masm,
+    int length,
+    FastCloneShallowArrayStub::Mode mode,

[Jakob Kummerow, 2011/11/17 12:31:36]

Just to be explicit, please add an ASSERT(mode !=
FastCloneShallowArrayStub::CLONE_ANY_ELEMENTS);

[danno, 2011/11/17 13:51:23]

Done.

+    Label* fail) {
+  // eax: literal index.
+  // ecx: literals array.
 
   // All sizes here are multiples of kPointerSize.
   int elements_size = 0;
-  if (length_ > 0) {
-    elements_size = mode_ == CLONE_DOUBLE_ELEMENTS
-        ? FixedDoubleArray::SizeFor(length_)
-        : FixedArray::SizeFor(length_);
+  if (length > 0) {
+    elements_size = mode == FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS
+        ? FixedDoubleArray::SizeFor(length)
+        : FixedArray::SizeFor(length);
   }
   int size = JSArray::kSize + elements_size;
 
-  // Load boilerplate object into ecx and check if we need to create a
-  // boilerplate.
-  Label slow_case;
-  __ mov(ecx, Operand(esp, 3 * kPointerSize));
-  __ mov(eax, Operand(esp, 2 * kPointerSize));
-  STATIC_ASSERT(kPointerSize == 4);
-  STATIC_ASSERT(kSmiTagSize == 1);
-  STATIC_ASSERT(kSmiTag == 0);
-  __ mov(ecx, FieldOperand(ecx, eax, times_half_pointer_size,
-                           FixedArray::kHeaderSize));
-  Factory* factory = masm->isolate()->factory();
-  __ cmp(ecx, factory->undefined_value());
-  __ j(equal, &slow_case);
-
-  if (FLAG_debug_code) {
-    const char* message;
-    Handle<Map> expected_map;
-    if (mode_ == CLONE_ELEMENTS) {
-      message = "Expected (writable) fixed array";
-      expected_map = factory->fixed_array_map();
-    } else if (mode_ == CLONE_DOUBLE_ELEMENTS) {
-      message = "Expected (writable) fixed double array";
-      expected_map = factory->fixed_double_array_map();
-    } else {
-      ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
-      message = "Expected copy-on-write fixed array";
-      expected_map = factory->fixed_cow_array_map();
-    }
-    __ push(ecx);
-    __ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset));
-    __ cmp(FieldOperand(ecx, HeapObject::kMapOffset), expected_map);
-    __ Assert(equal, message);
-    __ pop(ecx);
-  }
-
   // Allocate both the JS array and the elements array in one big
   // allocation. This avoids multiple limit checks.
-  __ AllocateInNewSpace(size, eax, ebx, edx, &slow_case, TAG_OBJECT);
+  __ AllocateInNewSpace(size, eax, ebx, edx, fail, TAG_OBJECT);
 
   // Copy the JS array part.
   for (int i = 0; i < JSArray::kSize; i += kPointerSize) {
-    if ((i != JSArray::kElementsOffset) || (length_ == 0)) {
+    if ((i != JSArray::kElementsOffset) || (length == 0)) {
       __ mov(ebx, FieldOperand(ecx, i));
       __ mov(FieldOperand(eax, i), ebx);
     }
   }
 
-  if (length_ > 0) {
+  if (length > 0) {
     // Get hold of the elements array of the boilerplate and setup the
     // elements pointer in the resulting object.
     __ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset));
@@ -302,13 +268,13 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     __ mov(FieldOperand(eax, JSArray::kElementsOffset), edx);
 
     // Copy the elements array.
-    if (mode_ == CLONE_ELEMENTS) {
+    if (mode == FastCloneShallowArrayStub::CLONE_ELEMENTS) {
       for (int i = 0; i < elements_size; i += kPointerSize) {
         __ mov(ebx, FieldOperand(ecx, i));
         __ mov(FieldOperand(edx, i), ebx);
       }
     } else {
-      ASSERT(mode_ == CLONE_DOUBLE_ELEMENTS);
+      ASSERT(mode == FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS);
       int i;
       for (i = 0; i < FixedDoubleArray::kHeaderSize; i += kPointerSize) {
         __ mov(ebx, FieldOperand(ecx, i));
@@ -322,7 +288,75 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
       ASSERT(i == elements_size);
     }
   }
+}
+
+
+void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
+  // Stack layout on entry:
+  //
+  // [esp + kPointerSize]: constant elements.
+  // [esp + (2 * kPointerSize)]: literal index.
+  // [esp + (3 * kPointerSize)]: literals array.
+
+  // Load boilerplate object into ecx and check if we need to create a
+  // boilerplate.
+  __ mov(ecx, Operand(esp, 3 * kPointerSize));
+  __ mov(eax, Operand(esp, 2 * kPointerSize));
+  STATIC_ASSERT(kPointerSize == 4);
+  STATIC_ASSERT(kSmiTagSize == 1);
+  STATIC_ASSERT(kSmiTag == 0);
+  __ mov(ecx, FieldOperand(ecx, eax, times_half_pointer_size,
+                           FixedArray::kHeaderSize));
+  Factory* factory = masm->isolate()->factory();
+  __ cmp(ecx, factory->undefined_value());
+  Label slow_case;
+  __ j(equal, &slow_case);
+
+  FastCloneShallowArrayStub::Mode mode = mode_;
+  // ecx is boilerplate object.
+  if (mode == CLONE_ANY_ELEMENTS) {
+    Label double_elements, check_fast_elements;
+    __ mov(ebx, FieldOperand(ecx, JSArray::kElementsOffset));
+    __ CheckMap(ebx, factory->fixed_cow_array_map(),
+                &check_fast_elements, DONT_DO_SMI_CHECK);
+    GenerateFastCloneShallowArrayCommon(masm, 0,
+                                        COPY_ON_WRITE_ELEMENTS, &slow_case);
+    __ ret(3 * kPointerSize);
+
+    __ bind(&check_fast_elements);
+    __ CheckMap(ebx, factory->fixed_array_map(),
+                &double_elements, DONT_DO_SMI_CHECK);
+    GenerateFastCloneShallowArrayCommon(masm, length_,
+                                        CLONE_ELEMENTS, &slow_case);
+    __ ret(3 * kPointerSize);
+
+    __ bind(&double_elements);
+    mode = CLONE_DOUBLE_ELEMENTS;
+    // Fall through to generate the code to handle double elements.
+  }
+
+  if (FLAG_debug_code) {
+    const char* message;
+    Handle<Map> expected_map;
+    if (mode == CLONE_ELEMENTS) {
+      message = "Expected (writable) fixed array";
+      expected_map = factory->fixed_array_map();
+    } else if (mode == CLONE_DOUBLE_ELEMENTS) {
+      message = "Expected (writable) fixed double array";
+      expected_map = factory->fixed_double_array_map();
+    } else {
+      ASSERT(mode == COPY_ON_WRITE_ELEMENTS);
+      message = "Expected copy-on-write fixed array";
+      expected_map = factory->fixed_cow_array_map();
+    }
+    __ push(ecx);
+    __ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset));
+    __ cmp(FieldOperand(ecx, HeapObject::kMapOffset), expected_map);
+    __ Assert(equal, message);
+    __ pop(ecx);
+  }
 
+  GenerateFastCloneShallowArrayCommon(masm, length_, mode, &slow_case);
   // Return and remove the on-stack parameters.
   __ ret(3 * kPointerSize);