Make subtype test cache stub shared between isolates.

runtime/vm/stub_code_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 30 matching lines @@
   const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
   const intptr_t argv_offset = NativeArguments::argv_offset();
   const intptr_t retval_offset = NativeArguments::retval_offset();
   const intptr_t exitframe_last_param_slot_from_fp = 1;
 
   __ SetPrologueOffset();
   __ Comment("CallToRuntimeStub");
   __ EnterStubFrame();
 
   COMPILE_ASSERT((kAbiPreservedCpuRegs & (1 << R28)) != 0);
-  __ LoadIsolate(R28, kNoPP);
+  __ LoadIsolate(R28);
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to Dart VM C++ code.
   __ StoreToOffset(FP, THR, Thread::top_exit_frame_info_offset(), kNoPP);
 
 #if defined(DEBUG)
   { Label ok;
     // Check that we are always entering from Dart code.
     __ LoadFromOffset(R8, R28, Isolate::vm_tag_offset(), kNoPP);
     __ CompareImmediate(R8, VMTag::kDartTagId, kNoPP);
@@ skipping 79 matching lines @@
 //   R1 : argc_tag including number of arguments and function kind.
 void StubCode::GenerateCallNativeCFunctionStub(Assembler* assembler) {
   const intptr_t thread_offset = NativeArguments::thread_offset();
   const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
   const intptr_t argv_offset = NativeArguments::argv_offset();
   const intptr_t retval_offset = NativeArguments::retval_offset();
 
   __ EnterStubFrame();
 
   COMPILE_ASSERT((kAbiPreservedCpuRegs & (1 << R28)) != 0);
-  __ LoadIsolate(R28, kNoPP);
+  __ LoadIsolate(R28);
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to native code.
   __ StoreToOffset(FP, THR, Thread::top_exit_frame_info_offset(), kNoPP);
 
 #if defined(DEBUG)
   { Label ok;
     // Check that we are always entering from Dart code.
     __ LoadFromOffset(R6, R28, Isolate::vm_tag_offset(), kNoPP);
     __ CompareImmediate(R6, VMTag::kDartTagId, kNoPP);
@@ skipping 81 matching lines @@
 //   R1 : argc_tag including number of arguments and function kind.
 void StubCode::GenerateCallBootstrapCFunctionStub(Assembler* assembler) {
   const intptr_t thread_offset = NativeArguments::thread_offset();
   const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
   const intptr_t argv_offset = NativeArguments::argv_offset();
   const intptr_t retval_offset = NativeArguments::retval_offset();
 
   __ EnterStubFrame();
 
   COMPILE_ASSERT((kAbiPreservedCpuRegs & (1 << R28)) != 0);
-  __ LoadIsolate(R28, kNoPP);
+  __ LoadIsolate(R28);
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to native code.
   __ StoreToOffset(FP, THR, Thread::top_exit_frame_info_offset(), kNoPP);
 
 #if defined(DEBUG)
   { Label ok;
     // Check that we are always entering from Dart code.
     __ LoadFromOffset(R6, R28, Isolate::vm_tag_offset(), kNoPP);
     __ CompareImmediate(R6, VMTag::kDartTagId, kNoPP);
@@ skipping 570 matching lines @@
   // We now load the pool pointer(PP) as we are about to invoke dart code and we
   // could potentially invoke some intrinsic functions which need the PP to be
   // set up.
   __ LoadPoolPointer(PP);
 
   // Set up THR, which caches the current thread in Dart code.
   if (THR != R3) {
     __ mov(THR, R3);
   }
   // Load Isolate pointer into temporary register R5.
-  __ LoadIsolate(R5, PP);
+  __ LoadIsolate(R5);
 
   // Save the current VMTag on the stack.
   __ LoadFromOffset(R4, R5, Isolate::vm_tag_offset(), PP);
   __ Push(R4);
 
   // Mark that the isolate is executing Dart code.
   __ LoadImmediate(R6, VMTag::kDartTagId, PP);
   __ StoreToOffset(R6, R5, Isolate::vm_tag_offset(), PP);
 
   // Save top resource and top exit frame info. Use R6 as a temporary register.
@@ skipping 36 matching lines @@
   // Call the Dart code entrypoint.
   __ blr(R0);  // R4 is the arguments descriptor array.
   __ Comment("InvokeDartCodeStub return");
 
   // Restore constant pool pointer after return.
   __ LoadPoolPointer(PP);
 
   // Get rid of arguments pushed on the stack.
   __ AddImmediate(SP, FP, kExitLinkSlotFromEntryFp * kWordSize, PP);
 
-  __ LoadIsolate(R28, PP);
+  __ LoadIsolate(R28);
 
   // Restore the saved top exit frame info and top resource back into the
   // Isolate structure. Uses R6 as a temporary register for this.
   __ Pop(R6);
   __ StoreToOffset(R6, THR, Thread::top_exit_frame_info_offset(), PP);
   __ Pop(R6);
   __ StoreToOffset(R6, THR, Thread::top_resource_offset(), PP);
 
   // Restore the current VMTag from the stack.
   __ Pop(R4);
@@ skipping 514 matching lines @@
     __ CompareImmediate(R6, num_args, kNoPP);
     __ b(&ok, EQ);
     __ Stop("Incorrect stub for IC data");
     __ Bind(&ok);
   }
 #endif  // DEBUG
 
   Label stepping, done_stepping;
   if (FLAG_support_debugger && !optimized) {
     __ Comment("Check single stepping");
-    __ LoadIsolate(R6, kNoPP);
+    __ LoadIsolate(R6);
     __ LoadFromOffset(
         R6, R6, Isolate::single_step_offset(), kNoPP, kUnsignedByte);
     __ CompareRegisters(R6, ZR);
     __ b(&stepping, NE);
     __ Bind(&done_stepping);
   }
 
   __ Comment("Range feedback collection");
   Label not_smi_or_overflow;
   if (range_collection_mode == kCollectRanges) {
@@ skipping 273 matching lines @@
     __ CompareImmediate(R6, 0, kNoPP);
     __ b(&ok, EQ);
     __ Stop("Incorrect IC data for unoptimized static call");
     __ Bind(&ok);
   }
 #endif  // DEBUG
 
   // Check single stepping.
   Label stepping, done_stepping;
     if (FLAG_support_debugger) {
-    __ LoadIsolate(R6, kNoPP);
+    __ LoadIsolate(R6);
     __ LoadFromOffset(
         R6, R6, Isolate::single_step_offset(), kNoPP, kUnsignedByte);
     __ CompareImmediate(R6, 0, kNoPP);
     __ b(&stepping, NE);
     __ Bind(&done_stepping);
   }
 
   // R5: IC data object (preserved).
   __ LoadFieldFromOffset(R6, R5, ICData::ic_data_offset(), kNoPP);
   // R6: ic_data_array with entries: target functions and count.
@@ skipping 95 matching lines @@
   __ Pop(R0);
   __ LeaveStubFrame();
   __ br(R0);
 }
 
 // Called only from unoptimized code. All relevant registers have been saved.
 void StubCode::GenerateDebugStepCheckStub(
     Assembler* assembler) {
   // Check single stepping.
   Label stepping, done_stepping;
-  __ LoadIsolate(R1, kNoPP);
+  __ LoadIsolate(R1);
   __ LoadFromOffset(
       R1, R1, Isolate::single_step_offset(), kNoPP, kUnsignedByte);
   __ CompareImmediate(R1, 0, kNoPP);
   __ b(&stepping, NE);
   __ Bind(&done_stepping);
 
   __ ret();
 
   __ Bind(&stepping);
   __ EnterStubFrame();
@@ skipping 127 matching lines @@
 // Does not return.
 void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
   ASSERT(kExceptionObjectReg == R0);
   ASSERT(kStackTraceObjectReg == R1);
   __ mov(LR, R0);  // Program counter.
   __ mov(SP, R1);  // Stack pointer.
   __ mov(FP, R2);  // Frame_pointer.
   __ mov(R0, R3);  // Exception object.
   __ mov(R1, R4);  // StackTrace object.
   __ mov(THR, R5);
-  __ LoadIsolate(R5, kNoPP);
+  __ LoadIsolate(R5);
   // Set the tag.
   __ LoadImmediate(R2, VMTag::kDartTagId, kNoPP);
   __ StoreToOffset(R2, R5, Isolate::vm_tag_offset(), kNoPP);
   // Clear top exit frame.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset(), kNoPP);
   __ ret();  // Jump to the exception handler code.
 }
 
 
 // Calls to the runtime to optimize the given function.
@@ skipping 86 matching lines @@
 // Called only from unoptimized code. All relevant registers have been saved.
 // LR: return address.
 // SP + 4: left operand.
 // SP + 0: right operand.
 // Return Zero condition flag set if equal.
 void StubCode::GenerateUnoptimizedIdenticalWithNumberCheckStub(
     Assembler* assembler) {
   // Check single stepping.
   Label stepping, done_stepping;
   if (FLAG_support_debugger) {
-    __ LoadIsolate(R1, kNoPP);
+    __ LoadIsolate(R1);
     __ LoadFromOffset(
         R1, R1, Isolate::single_step_offset(), kNoPP, kUnsignedByte);
     __ CompareImmediate(R1, 0, kNoPP);
     __ b(&stepping, NE);
     __ Bind(&done_stepping);
   }
 
   const Register left = R1;
   const Register right = R0;
   __ LoadFromOffset(left, SP, 1 * kWordSize, kNoPP);
@@ skipping 77 matching lines @@
 // Result:
 //  R1: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, R0, R1, R1);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64