New linear scan allocator.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2012, 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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 484 matching lines @@
     EmitEqualityAsInstanceCall(compiler, this);
   }
 }
 
 
 LocationSummary* RelationalOpComp::MakeLocationSummary() const {
   if (operands_class_id() == kSmi || operands_class_id() == kDouble) {
     const intptr_t kNumInputs = 2;
     const intptr_t kNumTemps = 1;
     LocationSummary* summary = new LocationSummary(kNumInputs,
-                                                   kNumTemps,
-                                                   LocationSummary::kCall);
+                                                   kNumTemps);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::RequiresRegister());
     summary->set_out(Location::RequiresRegister());
     summary->set_temp(0, Location::RequiresRegister());
     return summary;
   }
   ASSERT(operands_class_id() == kObject);
   return MakeCallSummary();
 }
 
@@ skipping 140 matching lines @@
 
 LocationSummary* NativeCallComp::MakeLocationSummary() const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 3;
   LocationSummary* locs = new LocationSummary(kNumInputs,
                                               kNumTemps,
                                               LocationSummary::kCall);
   locs->set_temp(0, Location::RegisterLocation(RAX));
   locs->set_temp(1, Location::RegisterLocation(RBX));
   locs->set_temp(2, Location::RegisterLocation(R10));
-  locs->set_out(Location::RequiresRegister());
+  locs->set_out(Location::RegisterLocation(RAX));
   return locs;
 }
 
 
 void NativeCallComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->temp(0).reg() == RAX);
   ASSERT(locs()->temp(1).reg() == RBX);
   ASSERT(locs()->temp(2).reg() == R10);
   Register result = locs()->out().reg();
 
@@ skipping 719 matching lines @@
   const ExternalLabel label("alloc_context",
                             StubCode::AllocateContextEntryPoint());
   compiler->GenerateCall(token_pos(),
                          try_index(),
                          &label,
                          PcDescriptors::kOther);
 }
 
 
 LocationSummary* CloneContextComp::MakeLocationSummary() const {
-  return LocationSummary::Make(1,
-                               Location::RequiresRegister(),
-                               LocationSummary::kCall);
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* locs = new LocationSummary(kNumInputs,
+                                              kNumTemps,
+                                              LocationSummary::kCall);
+  locs->set_in(0, Location::RegisterLocation(RAX));
+  locs->set_out(Location::RegisterLocation(RAX));
+  return locs;
 }
 
 
 void CloneContextComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register context_value = locs()->in(0).reg();
   Register result = locs()->out().reg();
 
   __ PushObject(Object::ZoneHandle());  // Make room for the result.
   __ pushq(context_value);
   compiler->GenerateCallRuntime(cid(),
@@ skipping 30 matching lines @@
 }
 
 
 LocationSummary* CheckStackOverflowComp::MakeLocationSummary() const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
   // TODO(vegorov): spilling is required only on an infrequently executed path.
   LocationSummary* summary = new LocationSummary(kNumInputs,
                                                  kNumTemps,
                                                  LocationSummary::kCall);
-  summary->set_temp(0, Location::RequiresRegister());
+  // All registers are blocked for a call.  Instructions marked at calls can use
+  // only fixed register temps.
+  summary->set_temp(0, Location::RegisterLocation(RAX));
   return summary;
 }
 
 
 void CheckStackOverflowComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register temp = locs()->temp(0).reg();
   // Generate stack overflow check.
   __ movq(temp, Immediate(Isolate::Current()->stack_limit_address()));
   __ cmpq(RSP, Address(temp, 0));
   Label no_stack_overflow;
@@ skipping 700 matching lines @@
   ASSERT(locs()->out().reg() == RAX);
   __ CompareObject(locs()->out().reg(), compiler->bool_true());
   EmitBranchOnCondition(compiler, branch_condition);
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64