Version 3.6.5

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
===================================================================
--- src/arm/macro-assembler-arm.h	(revision 9531)
+++ src/arm/macro-assembler-arm.h	(working copy)
@@ -29,6 +29,7 @@
 #define V8_ARM_MACRO_ASSEMBLER_ARM_H_
 
 #include "assembler.h"
+#include "frames.h"
 #include "v8globals.h"
 
 namespace v8 {
@@ -79,6 +80,14 @@
 };
 
 
+enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
+enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
+enum LinkRegisterStatus { kLRHasNotBeenSaved, kLRHasBeenSaved };
+
+
+bool AreAliased(Register r1, Register r2, Register r3, Register r4);
+
+
 // MacroAssembler implements a collection of frequently used macros.
 class MacroAssembler: public Assembler {
  public:
@@ -157,41 +166,127 @@
                  Heap::RootListIndex index,
                  Condition cond = al);
 
+  // ---------------------------------------------------------------------------
+  // GC Support
 
-  // Check if object is in new space.
-  // scratch can be object itself, but it will be clobbered.
-  void InNewSpace(Register object,
-                  Register scratch,
-                  Condition cond,  // eq for new space, ne otherwise
-                  Label* branch);
+  void IncrementalMarkingRecordWriteHelper(Register object,
+                                           Register value,
+                                           Register address);
 
+  enum RememberedSetFinalAction {
+    kReturnAtEnd,
+    kFallThroughAtEnd
+  };
 
-  // For the page containing |object| mark the region covering [address]
-  // dirty. The object address must be in the first 8K of an allocated page.
-  void RecordWriteHelper(Register object,
-                         Register address,
-                         Register scratch);
+  // Record in the remembered set the fact that we have a pointer to new space
+  // at the address pointed to by the addr register.  Only works if addr is not
+  // in new space.
+  void RememberedSetHelper(Register object,  // Used for debug code.
+                           Register addr,
+                           Register scratch,
+                           SaveFPRegsMode save_fp,
+                           RememberedSetFinalAction and_then);
 
-  // For the page containing |object| mark the region covering
-  // [object+offset] dirty. The object address must be in the first 8K
-  // of an allocated page.  The 'scratch' registers are used in the
-  // implementation and all 3 registers are clobbered by the
-  // operation, as well as the ip register. RecordWrite updates the
-  // write barrier even when storing smis.
-  void RecordWrite(Register object,
-                   Operand offset,
+  void CheckPageFlag(Register object,
+                     Register scratch,
+                     int mask,
+                     Condition cc,
+                     Label* condition_met);
+
+  // Check if object is in new space.  Jumps if the object is not in new space.
+  // The register scratch can be object itself, but scratch will be clobbered.
+  void JumpIfNotInNewSpace(Register object,
+                           Register scratch,
+                           Label* branch) {
+    InNewSpace(object, scratch, ne, branch);
+  }
+
+  // Check if object is in new space.  Jumps if the object is in new space.
+  // The register scratch can be object itself, but it will be clobbered.
+  void JumpIfInNewSpace(Register object,
+                        Register scratch,
+                        Label* branch) {
+    InNewSpace(object, scratch, eq, branch);
+  }
+
+  // Check if an object has a given incremental marking color.
+  void HasColor(Register object,
+                Register scratch0,
+                Register scratch1,
+                Label* has_color,
+                int first_bit,
+                int second_bit);
+
+  void JumpIfBlack(Register object,
                    Register scratch0,
-                   Register scratch1);
+                   Register scratch1,
+                   Label* on_black);
 
-  // For the page containing |object| mark the region covering
-  // [address] dirty. The object address must be in the first 8K of an
-  // allocated page.  All 3 registers are clobbered by the operation,
-  // as well as the ip register. RecordWrite updates the write barrier
-  // even when storing smis.
-  void RecordWrite(Register object,
-                   Register address,
-                   Register scratch);
+  // Checks the color of an object.  If the object is already grey or black
+  // then we just fall through, since it is already live.  If it is white and
+  // we can determine that it doesn't need to be scanned, then we just mark it
+  // black and fall through.  For the rest we jump to the label so the
+  // incremental marker can fix its assumptions.
+  void EnsureNotWhite(Register object,
+                      Register scratch1,
+                      Register scratch2,
+                      Register scratch3,
+                      Label* object_is_white_and_not_data);
 
+  // Detects conservatively whether an object is data-only, ie it does need to
+  // be scanned by the garbage collector.
+  void JumpIfDataObject(Register value,
+                        Register scratch,
+                        Label* not_data_object);
+
+  // Notify the garbage collector that we wrote a pointer into an object.
+  // |object| is the object being stored into, |value| is the object being
+  // stored.  value and scratch registers are clobbered by the operation.
+  // The offset is the offset from the start of the object, not the offset from
+  // the tagged HeapObject pointer.  For use with FieldOperand(reg, off).
+  void RecordWriteField(
+      Register object,
+      int offset,
+      Register value,
+      Register scratch,
+      LinkRegisterStatus lr_status,
+      SaveFPRegsMode save_fp,
+      RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
+      SmiCheck smi_check = INLINE_SMI_CHECK);
+
+  // As above, but the offset has the tag presubtracted.  For use with
+  // MemOperand(reg, off).
+  inline void RecordWriteContextSlot(
+      Register context,
+      int offset,
+      Register value,
+      Register scratch,
+      LinkRegisterStatus lr_status,
+      SaveFPRegsMode save_fp,
+      RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
+      SmiCheck smi_check = INLINE_SMI_CHECK) {
+    RecordWriteField(context,
+                     offset + kHeapObjectTag,
+                     value,
+                     scratch,
+                     lr_status,
+                     save_fp,
+                     remembered_set_action,
+                     smi_check);
+  }
+
+  // For a given |object| notify the garbage collector that the slot |address|
+  // has been written.  |value| is the object being stored. The value and
+  // address registers are clobbered by the operation.
+  void RecordWrite(
+      Register object,
+      Register address,
+      Register value,
+      LinkRegisterStatus lr_status,
+      SaveFPRegsMode save_fp,
+      RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
+      SmiCheck smi_check = INLINE_SMI_CHECK);
+
   // Push a handle.
   void Push(Handle<Object> handle);
 
@@ -318,16 +413,6 @@
             const double imm,
             const Condition cond = al);
 
-
-  // ---------------------------------------------------------------------------
-  // Activation frames
-
-  void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); }
-  void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); }
-
-  void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); }
-  void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); }
-
   // Enter exit frame.
   // stack_space - extra stack space, used for alignment before call to C.
   void EnterExitFrame(bool save_doubles, int stack_space = 0);
@@ -569,6 +654,13 @@
                  Register length,
                  Register scratch);
 
+  // Initialize fields with filler values.  Fields starting at |start_offset|
+  // not including end_offset are overwritten with the value in |filler|.  At
+  // the end the loop, |start_offset| takes the value of |end_offset|.
+  void InitializeFieldsWithFiller(Register start_offset,
+                                  Register end_offset,
+                                  Register filler);
+
   // ---------------------------------------------------------------------------
   // Support functions.
 
@@ -608,6 +700,18 @@
                          Register scratch,
                          Label* fail);
 
+  // Check if a map for a JSObject indicates that the object can have both smi
+  // and HeapObject elements.  Jump to the specified label if it does not.
+  void CheckFastObjectElements(Register map,
+                               Register scratch,
+                               Label* fail);
+
+  // Check if a map for a JSObject indicates that the object has fast smi only
+  // elements.  Jump to the specified label if it does not.
+  void CheckFastSmiOnlyElements(Register map,
+                                Register scratch,
+                                Label* fail);
+
   // Check if the map of an object is equal to a specified map (either
   // given directly or as an index into the root list) and branch to
   // label if not. Skip the smi check if not required (object is known
@@ -830,11 +934,11 @@
   // return address (unless this is somehow accounted for by the called
   // function).
   void CallCFunction(ExternalReference function, int num_arguments);
-  void CallCFunction(Register function, Register scratch, int num_arguments);
+  void CallCFunction(Register function, int num_arguments);
   void CallCFunction(ExternalReference function,
                      int num_reg_arguments,
                      int num_double_arguments);
-  void CallCFunction(Register function, Register scratch,
+  void CallCFunction(Register function,
                      int num_reg_arguments,
                      int num_double_arguments);
 
@@ -902,6 +1006,9 @@
   bool generating_stub() { return generating_stub_; }
   void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; }
   bool allow_stub_calls() { return allow_stub_calls_; }
+  void set_has_frame(bool value) { has_frame_ = value; }
+  bool has_frame() { return has_frame_; }
+  inline bool AllowThisStubCall(CodeStub* stub);
 
   // EABI variant for double arguments in use.
   bool use_eabi_hardfloat() {
@@ -1048,10 +1155,12 @@
 
   void LoadInstanceDescriptors(Register map, Register descriptors);
 
+  // Activation support.
+  void EnterFrame(StackFrame::Type type);
+  void LeaveFrame(StackFrame::Type type);
+
  private:
   void CallCFunctionHelper(Register function,
-                           ExternalReference function_reference,
-                           Register scratch,
                            int num_reg_arguments,
                            int num_double_arguments);
 
@@ -1067,16 +1176,25 @@
                       const CallWrapper& call_wrapper,
                       CallKind call_kind);
 
-  // Activation support.
-  void EnterFrame(StackFrame::Type type);
-  void LeaveFrame(StackFrame::Type type);
-
   void InitializeNewString(Register string,
                            Register length,
                            Heap::RootListIndex map_index,
                            Register scratch1,
                            Register scratch2);
 
+  // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
+  void InNewSpace(Register object,
+                  Register scratch,
+                  Condition cond,  // eq for new space, ne otherwise.
+                  Label* branch);
+
+  // Helper for finding the mark bits for an address.  Afterwards, the
+  // bitmap register points at the word with the mark bits and the mask
+  // the position of the first bit.  Leaves addr_reg unchanged.
+  inline void GetMarkBits(Register addr_reg,
+                          Register bitmap_reg,
+                          Register mask_reg);
+
   // Compute memory operands for safepoint stack slots.
   static int SafepointRegisterStackIndex(int reg_code);
   MemOperand SafepointRegisterSlot(Register reg);
@@ -1084,6 +1202,7 @@
 
   bool generating_stub_;
   bool allow_stub_calls_;
+  bool has_frame_;
   // This handle will be patched with the code object on installation.
   Handle<Object> code_object_;