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

1 files changed, 10 insertions, 2 deletions

diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index ebd578c5cd..d037b94b4a 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -585,8 +585,13 @@ class DeoptimizationSlowPathARM : public SlowPathCodeARM {
   void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
     CodeGeneratorARM* arm_codegen = down_cast<CodeGeneratorARM*>(codegen);
     __ Bind(GetEntryLabel());
+    LocationSummary* locations = instruction_->GetLocations();
+    SaveLiveRegisters(codegen, locations);
+    InvokeRuntimeCallingConvention calling_convention;
+    __ LoadImmediate(calling_convention.GetRegisterAt(0),
+                     static_cast<uint32_t>(instruction_->AsDeoptimize()->GetDeoptimizationKind()));
     arm_codegen->InvokeRuntime(kQuickDeoptimize, instruction_, instruction_->GetDexPc(), this);
-    CheckEntrypointTypes<kQuickDeoptimize, void, void>();
+    CheckEntrypointTypes<kQuickDeoptimize, void, DeoptimizationKind>();
   }
 
   const char* GetDescription() const OVERRIDE { return "DeoptimizationSlowPathARM"; }
@@ -2672,7 +2677,10 @@ void InstructionCodeGeneratorARM::VisitIf(HIf* if_instr) {
 void LocationsBuilderARM::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::RequiresRegister());
   }