From 707a5831167fed41d1127f8d5e278a1c8c70549f Mon Sep 17 00:00:00 2001
From: "haitao.feng@intel.com"
 <haitao.feng@intel.com@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Thu, 10 Apr 2014 02:11:43 +0000
Subject: [PATCH] Introduce LoadSharedFunctionInfoSpecialField for x64 port.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/231013002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20636 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/x64/builtins-x64.cc        |  5 ++---
 src/x64/full-codegen-x64.cc    |  5 ++---
 src/x64/macro-assembler-x64.cc | 38 +++++++++++++++++++++++++++++++-------
 src/x64/macro-assembler-x64.h  |  9 +++++++--
 4 files changed, 42 insertions(+), 15 deletions(-)

diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 66ac556..d14a935 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -963,9 +963,8 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
   //     expected arguments matches what we're providing.  If so, jump
   //     (tail-call) to the code in register edx without checking arguments.
   __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movsxlq(rbx,
-             FieldOperand(rdx,
-                          SharedFunctionInfo::kFormalParameterCountOffset));
+  __ LoadSharedFunctionInfoSpecialField(rbx, rdx,
+      SharedFunctionInfo::kFormalParameterCountOffset);
   __ movp(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
   __ cmpp(rax, rbx);
   __ j(not_equal,
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index e4fa4d9..8962267 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -2169,9 +2169,8 @@ void FullCodeGenerator::EmitGeneratorResume(Expression *generator,
 
   // Push holes for arguments to generator function.
   __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movsxlq(rdx,
-             FieldOperand(rdx,
-                          SharedFunctionInfo::kFormalParameterCountOffset));
+  __ LoadSharedFunctionInfoSpecialField(rdx, rdx,
+      SharedFunctionInfo::kFormalParameterCountOffset);
   __ LoadRoot(rcx, Heap::kTheHoleValueRootIndex);
   Label push_argument_holes, push_frame;
   __ bind(&push_argument_holes);
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index f943177..693a5c6 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2696,10 +2696,34 @@ void MacroAssembler::Pop(const Operand& dst) {
 }
 
 
-void MacroAssembler::TestBit(const Operand& src, int bits) {
+void MacroAssembler::LoadSharedFunctionInfoSpecialField(Register dst,
+                                                        Register base,
+                                                        int offset) {
+  ASSERT(offset > SharedFunctionInfo::kLengthOffset &&
+         offset <= SharedFunctionInfo::kSize &&
+         (((offset - SharedFunctionInfo::kLengthOffset) / kIntSize) % 2 == 1));
+  if (kPointerSize == kInt64Size) {
+    movsxlq(dst, FieldOperand(base, offset));
+  } else {
+    movp(dst, FieldOperand(base, offset));
+    SmiToInteger32(dst, dst);
+  }
+}
+
+
+void MacroAssembler::TestBitSharedFunctionInfoSpecialField(Register base,
+                                                           int offset,
+                                                           int bits) {
+  ASSERT(offset > SharedFunctionInfo::kLengthOffset &&
+         offset <= SharedFunctionInfo::kSize &&
+         (((offset - SharedFunctionInfo::kLengthOffset) / kIntSize) % 2 == 1));
+  if (kPointerSize == kInt32Size) {
+    // On x32, this field is represented by SMI.
+    bits += kSmiShift;
+  }
   int byte_offset = bits / kBitsPerByte;
   int bit_in_byte = bits & (kBitsPerByte - 1);
-  testb(Operand(src, byte_offset), Immediate(1 << bit_in_byte));
+  testb(FieldOperand(base, offset + byte_offset), Immediate(1 << bit_in_byte));
 }
 
 
@@ -3538,9 +3562,9 @@ void MacroAssembler::TryGetFunctionPrototype(Register function,
          FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
     // It's not smi-tagged (stored in the top half of a smi-tagged 8-byte
     // field).
-    TestBit(FieldOperand(kScratchRegister,
-                         SharedFunctionInfo::kCompilerHintsOffset),
-            SharedFunctionInfo::kBoundFunction);
+    TestBitSharedFunctionInfoSpecialField(kScratchRegister,
+        SharedFunctionInfo::kCompilerHintsOffset,
+        SharedFunctionInfo::kBoundFunction);
     j(not_zero, miss);
   }
 
@@ -3667,8 +3691,8 @@ void MacroAssembler::InvokeFunction(Register function,
   ASSERT(function.is(rdi));
   movp(rdx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
   movp(rsi, FieldOperand(function, JSFunction::kContextOffset));
-  movsxlq(rbx,
-          FieldOperand(rdx, SharedFunctionInfo::kFormalParameterCountOffset));
+  LoadSharedFunctionInfoSpecialField(rbx, rdx,
+      SharedFunctionInfo::kFormalParameterCountOffset);
   // Advances rdx to the end of the Code object header, to the start of
   // the executable code.
   movp(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 7448c19..ee4fb85 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -813,8 +813,13 @@ class MacroAssembler: public Assembler {
   // Move if the registers are not identical.
   void Move(Register target, Register source);
 
-  // Bit-field support.
-  void TestBit(const Operand& dst, int bit_index);
+  // TestBit and Load SharedFunctionInfo special field.
+  void TestBitSharedFunctionInfoSpecialField(Register base,
+                                             int offset,
+                                             int bit_index);
+  void LoadSharedFunctionInfoSpecialField(Register dst,
+                                          Register base,
+                                          int offset);
 
   // Handle support
   void Move(Register dst, Handle<Object> source);
-- 
2.7.4