commit 4e92c3ce7ef354620a785553bbada554fca83a67
author Nicolas Geoffray <ngeoffray@google.com> Mon May 08 09:34:26 2017 +0100
committer Nicolas Geoffray <ngeoffray@google.com> Wed May 10 09:27:33 2017 +0100
tree 42029deff4d3ba7f89b5fdbf79ff410da575f431
parent 549844e9ccf432d1396b19af890eedb602b8ba04

Add runtime reasons for deopt.

Currently to help investigate. Also:
1) Log when deoptimization happens (which method and what reason)
2) Trace when deoptimization happens (to make it visible in systrace)

bug:37655083
Test: test-art-host test-art-target
Change-Id: I0c2d87b40db09e8e475cf97a7c784a034c585e97

compiler/optimizing/code_generator_x86_64.cc

diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index f413739..f2ed52b 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -397,8 +397,14 @@
   void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
     CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
     __ Bind(GetEntryLabel());
+    LocationSummary* locations = instruction_->GetLocations();
+    SaveLiveRegisters(codegen, locations);
+    InvokeRuntimeCallingConvention calling_convention;
+    x86_64_codegen->Load32BitValue(
+        CpuRegister(calling_convention.GetRegisterAt(0)),
+        static_cast<uint32_t>(instruction_->AsDeoptimize()->GetDeoptimizationKind()));
     x86_64_codegen->InvokeRuntime(kQuickDeoptimize, instruction_, instruction_->GetDexPc(), this);
-    CheckEntrypointTypes<kQuickDeoptimize, void, void>();
+    CheckEntrypointTypes<kQuickDeoptimize, void, DeoptimizationKind>();
   }
 
   const char* GetDescription() const OVERRIDE { return "DeoptimizationSlowPathX86_64"; }
@@ -1710,7 +1716,10 @@
 void LocationsBuilderX86_64::VisitDeoptimize(HDeoptimize* deoptimize) {
   LocationSummary* locations = new (GetGraph()->GetArena())
       LocationSummary(deoptimize, LocationSummary::kCallOnSlowPath);
-  locations->SetCustomSlowPathCallerSaves(RegisterSet::Empty());  // No caller-save registers.
+  InvokeRuntimeCallingConvention calling_convention;
+  RegisterSet caller_saves = RegisterSet::Empty();
+  caller_saves.Add(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
+  locations->SetCustomSlowPathCallerSaves(caller_saves);
   if (IsBooleanValueOrMaterializedCondition(deoptimize->InputAt(0))) {
     locations->SetInAt(0, Location::Any());
   }