Expands the use of Immediate and Operand wrappers.

runtime/vm/assembler_arm.h

Index: runtime/vm/assembler_arm.h
===================================================================
--- runtime/vm/assembler_arm.h	(revision 40903)
+++ runtime/vm/assembler_arm.h	(working copy)
@@ -231,6 +231,10 @@
     encoding_ |= static_cast<uint32_t>(rn) << kRnShift;
   }
 
+  // There is no register offset mode unless Mode is Offset, in which case the
+  // shifted register case below should be used.
+  Address(Register rn, Register r, Mode am);
+
   Address(Register rn, Register rm,
           Shift shift = LSL, uint32_t shift_imm = 0, Mode am = Offset) {
     Operand o(rm, shift, shift_imm);
@@ -243,6 +247,9 @@
     encoding_ = o.encoding() | am | (static_cast<uint32_t>(rn) << kRnShift);
   }
 
+  // There is no shifted register mode with a register shift.
+  Address(Register rn, Register rm, Shift shift, Register r, Mode am = Offset);
+
   static OperandSize OperandSizeFor(intptr_t cid);
 
   static bool CanHoldLoadOffset(OperandSize size,
@@ -279,6 +286,9 @@
   FieldAddress(Register base, int32_t disp)
       : Address(base, disp - kHeapObjectTag) { }
 
+  // This addressing mode does not exist.
+  FieldAddress(Register base, Register r);
+
   FieldAddress(const FieldAddress& other) : Address(other) { }
 
   FieldAddress& operator=(const FieldAddress& other) {
@@ -396,8 +406,6 @@
 
   // Miscellaneous data-processing instructions.
   void clz(Register rd, Register rm, Condition cond = AL);
-  void movw(Register rd, uint16_t imm16, Condition cond = AL);
-  void movt(Register rd, uint16_t imm16, Condition cond = AL);
 
   // Multiply instructions.
   void mul(Register rd, Register rn, Register rm, Condition cond = AL);
@@ -717,14 +725,19 @@
 
   // Convenience shift instructions. Use mov instruction with shifter operand
   // for variants setting the status flags.
-  void Lsl(Register rd, Register rm, uint32_t shift_imm, Condition cond = AL);
+  void Lsl(Register rd, Register rm, const Operand& shift_imm,
+           Condition cond = AL);
   void Lsl(Register rd, Register rm, Register rs, Condition cond = AL);
-  void Lsr(Register rd, Register rm, uint32_t shift_imm, Condition cond = AL);
+  void Lsr(Register rd, Register rm, const Operand& shift_imm,
+           Condition cond = AL);
   void Lsr(Register rd, Register rm, Register rs, Condition cond = AL);
-  void Asr(Register rd, Register rm, uint32_t shift_imm, Condition cond = AL);
+  void Asr(Register rd, Register rm, const Operand& shift_imm,
+           Condition cond = AL);
   void Asr(Register rd, Register rm, Register rs, Condition cond = AL);
-  void Asrs(Register rd, Register rm, uint32_t shift_imm, Condition cond = AL);
-  void Ror(Register rd, Register rm, uint32_t shift_imm, Condition cond = AL);
+  void Asrs(Register rd, Register rm, const Operand& shift_imm,
+            Condition cond = AL);
+  void Ror(Register rd, Register rm, const Operand& shift_imm,
+           Condition cond = AL);
   void Ror(Register rd, Register rm, Register rs, Condition cond = AL);
   void Rrx(Register rd, Register rm, Condition cond = AL);
 
@@ -738,19 +751,19 @@
   void Vdivqs(QRegister qd, QRegister qn, QRegister qm);
 
   void SmiTag(Register reg, Condition cond = AL) {
-    Lsl(reg, reg, kSmiTagSize, cond);
+    Lsl(reg, reg, Operand(kSmiTagSize), cond);
   }
 
   void SmiTag(Register dst, Register src, Condition cond = AL) {
-    Lsl(dst, src, kSmiTagSize, cond);
+    Lsl(dst, src, Operand(kSmiTagSize), cond);
   }
 
   void SmiUntag(Register reg, Condition cond = AL) {
-    Asr(reg, reg, kSmiTagSize, cond);
+    Asr(reg, reg, Operand(kSmiTagSize), cond);
   }
 
   void SmiUntag(Register dst, Register src, Condition cond = AL) {
-    Asr(dst, src, kSmiTagSize, cond);
+    Asr(dst, src, Operand(kSmiTagSize), cond);
   }
 
   // Untag the value in the register assuming it is a smi.
@@ -759,7 +772,7 @@
   // Otherwise fall-through.
   void SmiUntag(Register dst, Register src, Label* is_smi) {
     ASSERT(kSmiTagSize == 1);
-    Asrs(dst, src, kSmiTagSize);
+    Asrs(dst, src, Operand(kSmiTagSize));
     b(is_smi, CC);
   }
 
@@ -870,6 +883,11 @@
 
   bool use_far_branches_;
 
+  // If you are thinking of using one or both of these instructions directly,
+  // instead LoadImmediate should probably be used.
+  void movw(Register rd, uint16_t imm16, Condition cond = AL);
+  void movt(Register rd, uint16_t imm16, Condition cond = AL);
+
   int32_t AddObject(const Object& obj);
   int32_t AddExternalLabel(const ExternalLabel* label);