VM: New calling convention for generated code.

runtime/vm/code_patcher_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"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
 
 namespace dart {
 
-void CodePatcher::PatchInstanceCallAt(uword return_address,
-                                      const Code& code,
-                                      uword new_target) {
-  ASSERT(code.ContainsInstructionAt(return_address));
-  CallPattern call(return_address, code);
-  call.SetTargetAddress(new_target);
-}
-
-
 class PoolPointerCall : public ValueObject {
  public:
   PoolPointerCall(uword pc, const Code& code)
       : end_(pc),
         object_pool_(ObjectPool::Handle(code.GetObjectPool())) {
     // Last instruction: blr ip0.
     ASSERT(*(reinterpret_cast<uint32_t*>(end_) - 1) == 0xd63f0200);
     InstructionPattern::DecodeLoadWordFromPool(
-        end_ - Instr::kInstrSize, &reg_, &index_);
+        end_ - 2 * Instr::kInstrSize, &reg_, &index_);
   }
 
   intptr_t pp_index() const {
     return index_;
   }
 
-  uword Target() const {
-    return object_pool_.RawValueAt(pp_index());
+  RawCode* Target() const {
+    return reinterpret_cast<RawCode*>(object_pool_.ObjectAt(pp_index()));
   }
 
-  void SetTarget(uword target) const {
-    object_pool_.SetRawValueAt(pp_index(), target);
+  void SetTarget(const Code& target) const {
+    object_pool_.SetObjectAt(pp_index(), target);
     // No need to flush the instruction cache, since the code is not modified.
   }
 
  private:
   static const int kCallPatternSize = 3 * Instr::kInstrSize;
   uword end_;
   const ObjectPool& object_pool_;
   Register reg_;
   intptr_t index_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(PoolPointerCall);
 };
 
 
-uword CodePatcher::GetStaticCallTargetAt(uword return_address,
-                                         const Code& code) {
+RawCode* CodePatcher::GetStaticCallTargetAt(uword return_address,
+                                            const Code& code) {
   ASSERT(code.ContainsInstructionAt(return_address));
   PoolPointerCall call(return_address, code);
   return call.Target();
 }
 
 
 void CodePatcher::PatchStaticCallAt(uword return_address,
                                     const Code& code,
-                                    uword new_target) {
+                                    const Code& new_target) {
   PatchPoolPointerCallAt(return_address, code, new_target);
 }
 
 
 void CodePatcher::PatchPoolPointerCallAt(uword return_address,
                                          const Code& code,
-                                         uword new_target) {
+                                         const Code& new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   PoolPointerCall call(return_address, code);
   call.SetTarget(new_target);
 }
 
 
-void CodePatcher::InsertCallAt(uword start, uword target) {
+void CodePatcher::InsertDeoptimizationCallAt(uword start, uword target) {
   // The inserted call should not overlap the lazy deopt jump code.
-  ASSERT(start + CallPattern::kLengthInBytes <= target);
-  CallPattern::InsertAt(start, target);
+  ASSERT(start + CallPattern::kDeoptCallLengthInBytes <= target);
+  CallPattern::InsertDeoptCallAt(start, target);
 }
 
 
-uword CodePatcher::GetInstanceCallAt(uword return_address,
-                                     const Code& code,
-                                     ICData* ic_data) {
+RawCode* CodePatcher::GetInstanceCallAt(uword return_address,
+                                        const Code& code,
+                                        ICData* ic_data) {
   ASSERT(code.ContainsInstructionAt(return_address));
   CallPattern call(return_address, code);
   if (ic_data != NULL) {
     *ic_data = call.IcData();
   }
-  return call.TargetAddress();
+  return call.TargetCode();
 }
 
 
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
   // The instance call instruction sequence has a variable size on ARM64.
   UNREACHABLE();
   return 0;
 }
 
 
 RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(
     uword return_address, const Code& code, ICData* ic_data_result) {
   ASSERT(code.ContainsInstructionAt(return_address));
   CallPattern static_call(return_address, code);
   ICData& ic_data = ICData::Handle();
   ic_data ^= static_call.IcData();
   if (ic_data_result != NULL) {
     *ic_data_result = ic_data.raw();
   }
   return ic_data.GetTargetAt(0);
 }
 
 
 void CodePatcher::PatchNativeCallAt(uword return_address,
                                     const Code& code,
                                     NativeFunction target,
                                     const Code& trampoline) {
   ASSERT(code.ContainsInstructionAt(return_address));
   NativeCallPattern call(return_address, code);
-  call.set_target(trampoline.EntryPoint());
+  call.set_target(trampoline);
   call.set_native_function(target);
 }
 
 
-uword CodePatcher::GetNativeCallAt(uword return_address,
-                                   const Code& code,
-                                   NativeFunction* target) {
+RawCode* CodePatcher::GetNativeCallAt(uword return_address,
+                                      const Code& code,
+                                      NativeFunction* target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   NativeCallPattern call(return_address, code);
   *target = call.native_function();
   return call.target();
 }
 
 
 // This class pattern matches on a load from the object pool.  Loading on
 // ARM64 is complicated because it can take more than one form.  We
 // match backwards from the end of the sequence so we can reuse the code for
@@ skipping 31 matching lines @@
 
 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
   ASSERT(code.ContainsInstructionAt(pc));
   EdgeCounter counter(pc, code);
   return counter.edge_counter();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64