Thumb2 Backend: Use sp-relative offsets for stack slot operations in Crankshaft

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index d0bfcbbb94e102d44f0bde49ffa3464b5b3e5496..e5688dd00939f35ddfd8f0a5f67a3fbcff13bcd7 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -64,6 +64,7 @@ class LCodeGen BASE_EMBEDDED {
         osr_pc_offset_(-1),
         last_lazy_deopt_pc_(0),
         frame_is_built_(false),
+        fp_sp_delta_(-1),
         safepoints_(info->zone()),
         resolver_(this),
         expected_safepoint_kind_(Safepoint::kSimple),
@@ -232,15 +233,28 @@ class LCodeGen BASE_EMBEDDED {
     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
   };
 
+  void SetFpSpDelta(int argument_count);
+
+  void Push(Register src1);
+  void Push(Register src1, Register src2);
+  void Push(Register src1, Register src2, Register src3);
+  void Push(Register src1, Register src2, Register src3, Register src4);
+
+#ifdef DEBUG
+  void CheckFpSpDelta(LInstruction* instr);
+#endif  // DEBUG
+
   void CallCode(
       Handle<Code> code,
       RelocInfo::Mode mode,
+      int num_arguments,
       LInstruction* instr,
       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 
   void CallCodeGeneric(
       Handle<Code> code,
       RelocInfo::Mode mode,
+      int num_arguments,
       LInstruction* instr,
       SafepointMode safepoint_mode,
       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
@@ -408,6 +422,7 @@ class LCodeGen BASE_EMBEDDED {
   int osr_pc_offset_;
   int last_lazy_deopt_pc_;
   bool frame_is_built_;
+  int fp_sp_delta_;
 
   // Builder that keeps track of safepoints in the code. The table
   // itself is emitted at the end of the generated code.
@@ -432,9 +447,12 @@ class LCodeGen BASE_EMBEDDED {
       switch (codegen_->expected_safepoint_kind_) {
         case Safepoint::kWithRegisters:
           codegen_->masm_->PushSafepointRegisters();
-          break;
+          codegen_->fp_sp_delta_ += kNumSafepointSavedRegisters * kPointerSize;
+        break;
         case Safepoint::kWithRegistersAndDoubles:
           codegen_->masm_->PushSafepointRegistersAndDoubles();
+          codegen_->fp_sp_delta_ += kNumSafepointSavedRegisters * kPointerSize
+              + DwVfpRegister::NumAllocatableRegisters() * kDoubleSize;
           break;
         default:
           UNREACHABLE();
@@ -447,9 +465,12 @@ class LCodeGen BASE_EMBEDDED {
       switch (kind) {
         case Safepoint::kWithRegisters:
           codegen_->masm_->PopSafepointRegisters();
+          codegen_->fp_sp_delta_ -= kNumSafepointRegisters * kPointerSize;
           break;
         case Safepoint::kWithRegistersAndDoubles:
           codegen_->masm_->PopSafepointRegistersAndDoubles();
+          codegen_->fp_sp_delta_ -= kNumSafepointSavedRegisters * kPointerSize
+              + DwVfpRegister::NumAllocatableRegisters() * kDoubleSize;
           break;
         default:
           UNREACHABLE();