Refactor elements kind conversion.

src/x64/codegen-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #if defined(V8_TARGET_ARCH_X64)
 
 #include "codegen.h"
+#include "macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 // -------------------------------------------------------------------------
 // Platform-specific RuntimeCallHelper functions.
 
 void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
   masm->EnterFrame(StackFrame::INTERNAL);
   ASSERT(!masm->has_frame());
@@ skipping 93 matching lines @@
 
   CodeDesc desc;
   masm.GetCode(&desc);
   OS::ProtectCode(buffer, actual_size);
   // Call the function from C++ through this pointer.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
+#undef __
+
+// -------------------------------------------------------------------------
+// Code generators
+
+#define __ ACCESS_MASM(masm)
+
+void ElementsTransitionGenerator::GenerateSmiOnlyToObject(
+    MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax    : value
+  //  -- rbx    : target map
+  //  -- rcx    : key
+  //  -- rdx    : receiver
+  //  -- rsp[0] : return address
+  // -----------------------------------
+  // Set transitioned map.
+  __ movq(FieldOperand(rdx, HeapObject::kMapOffset), rbx);
+  __ RecordWriteField(rdx,
+                      HeapObject::kMapOffset,
+                      rbx,
+                      rdi,
+                      kDontSaveFPRegs,
+                      EMIT_REMEMBERED_SET,
+                      OMIT_SMI_CHECK);
+}
+
+
+void ElementsTransitionGenerator::GenerateSmiOnlyToDouble(
+    MacroAssembler* masm, Label* fail) {
+  // ----------- S t a t e -------------
+  //  -- rax    : value
+  //  -- rbx    : target map
+  //  -- rcx    : key
+  //  -- rdx    : receiver
+  //  -- rsp[0] : return address
+  // -----------------------------------
+  // The fail label is not actually used since we do not allocate.
+
+  // Set transitioned map.
+  __ movq(FieldOperand(rdx, HeapObject::kMapOffset), rbx);
+  __ RecordWriteField(rdx,
+                      HeapObject::kMapOffset,
+                      rbx,
+                      rdi,
+                      kDontSaveFPRegs,
+                      EMIT_REMEMBERED_SET,
+                      OMIT_SMI_CHECK);
+  // Set backing store's map
+  __ movq(r8, FieldOperand(rdx, JSObject::kElementsOffset));
+  __ LoadRoot(rdi, Heap::kFixedDoubleArrayMapRootIndex);
+  __ movq(FieldOperand(r8, HeapObject::kMapOffset), rdi);
+
+  // Convert smis to doubles and holes to hole NaNs.  Since FixedArray and
+  // FixedDoubleArray do not differ in size, we do not allocate a new array.
+  STATIC_ASSERT(FixedDoubleArray::kLengthOffset == FixedArray::kLengthOffset);
+  STATIC_ASSERT(FixedDoubleArray::kHeaderSize == FixedArray::kHeaderSize);
+  __ SmiToInteger32(r9, FieldOperand(r8, FixedDoubleArray::kLengthOffset));
+  // r8 : elements array
+  // r9 : elements array length
+  Label loop, entry, convert_hole;
+  __ movq(r15, BitCast<int64_t, uint64_t>(kHoleNanInt64), RelocInfo::NONE);
+  // r15: the-hole NaN
+  __ jmp(&entry);
+  __ bind(&loop);
+  __ decq(r9);
+  __ movq(rbx,
+          FieldOperand(r8, r9, times_8, FixedArray::kHeaderSize));
+  // r9 : current element's index
+  // rbx: current element (smi-tagged)
+  __ JumpIfNotSmi(rbx, &convert_hole);
+  __ SmiToInteger32(rbx, rbx);
+  __ cvtlsi2sd(xmm0, rbx);
+  __ movsd(FieldOperand(r8, r9, times_8, FixedDoubleArray::kHeaderSize),
+           xmm0);
+  __ jmp(&entry);
+  __ bind(&convert_hole);
+  __ movq(FieldOperand(r8, r9, times_8, FixedDoubleArray::kHeaderSize), r15);
+  __ bind(&entry);
+  __ testq(r9, r9);
+  __ j(not_zero, &loop);
+}
+
+
+void ElementsTransitionGenerator::GenerateDoubleToObject(
+    MacroAssembler* masm, Label* fail) {
+  // ----------- S t a t e -------------
+  //  -- rax    : value
+  //  -- rbx    : target map
+  //  -- rcx    : key
+  //  -- rdx    : receiver
+  //  -- rsp[0] : return address
+  // -----------------------------------
+  Label loop, entry, convert_hole, gc_required;
+  __ push(rax);
+
+  __ movq(r8, FieldOperand(rdx, JSObject::kElementsOffset));
+  __ SmiToInteger32(r9, FieldOperand(r8, FixedDoubleArray::kLengthOffset));
+  // r8 : source FixedDoubleArray
+  // r9 : number of elements
+  __ lea(rdi, Operand(r9, times_pointer_size, FixedArray::kHeaderSize));
+  __ AllocateInNewSpace(rdi, rax, r14, r15, &gc_required, TAG_OBJECT);
+  // rax: destination FixedArray
+  __ LoadRoot(rdi, Heap::kFixedArrayMapRootIndex);
+  __ movq(FieldOperand(rax, HeapObject::kMapOffset), rdi);
+  __ Integer32ToSmi(r14, r9);
+  __ movq(FieldOperand(rax, FixedArray::kLengthOffset), r14);
+
+  // Prepare for conversion loop.
+  __ movq(rsi, BitCast<int64_t, uint64_t>(kHoleNanInt64), RelocInfo::NONE);
+  __ LoadRoot(rdi, Heap::kTheHoleValueRootIndex);
+  // rsi: the-hole NaN
+  // rdi: pointer to the-hole
+  __ jmp(&entry);
+
+  // Call into runtime if GC is required.
+  __ bind(&gc_required);
+  __ pop(rax);
+  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+  __ jmp(fail);
+
+  // Box doubles into heap numbers.
+  __ bind(&loop);
+  __ decq(r9);
+  __ movq(r14, FieldOperand(r8,
+                            r9,
+                            times_pointer_size,
+                            FixedDoubleArray::kHeaderSize));
+  // r9 : current element's index
+  // r14: current element
+  __ cmpq(r14, rsi);
+  __ j(equal, &convert_hole);
+
+  // Non-hole double, copy value into a heap number.
+  __ AllocateHeapNumber(r11, r15, &gc_required);
+  // r11: new heap number
+  __ movq(FieldOperand(r11, HeapNumber::kValueOffset), r14);
+  __ movq(FieldOperand(rax,
+                       r9,
+                       times_pointer_size,
+                       FixedArray::kHeaderSize),
+          r11);
+  __ movq(r15, r9);
+  __ RecordWriteArray(rax,
+                      r11,
+                      r15,
+                      kDontSaveFPRegs,
+                      EMIT_REMEMBERED_SET,
+                      OMIT_SMI_CHECK);
+  __ jmp(&entry, Label::kNear);
+
+  // Replace the-hole NaN with the-hole pointer.
+  __ bind(&convert_hole);
+  __ movq(FieldOperand(rax,
+                       r9,
+                       times_pointer_size,
+                       FixedArray::kHeaderSize),
+          rdi);
+
+  __ bind(&entry);
+  __ testq(r9, r9);
+  __ j(not_zero, &loop);
+
+  // Set transitioned map.
+  __ movq(FieldOperand(rdx, HeapObject::kMapOffset), rbx);
+  __ RecordWriteField(rdx,
+                      HeapObject::kMapOffset,
+                      rbx,
+                      rdi,
+                      kDontSaveFPRegs,
+                      EMIT_REMEMBERED_SET,
+                      OMIT_SMI_CHECK);
+  // Replace receiver's backing store with newly created and filled FixedArray.
+  __ movq(FieldOperand(rdx, JSObject::kElementsOffset), rax);
+  __ RecordWriteField(rdx,
+                      JSObject::kElementsOffset,
+                      rax,
+                      rdi,
+                      kDontSaveFPRegs,
+                      EMIT_REMEMBERED_SET,
+                      OMIT_SMI_CHECK);
+  __ pop(rax);
+  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+}
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64