Make runtime call on main for HLoadClass/kDexCacheViaMethod.

Remove dependency of the compiled code on types dex cache
array in preparation for changing to a hash-based array.

Test: m test-art-host
Test: m test-art-target on Nexus 9
Bug: 30627598
Change-Id: I3c426ed762c12eb9eb4bb61ea9a23a0659abf0a2

1 files changed, 11 insertions, 16 deletions

diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 740affe016..d92092c911 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -5579,7 +5579,6 @@ class HLoadClass FINAL : public HInstruction {
     SetPackedField<LoadKindField>(
         is_referrers_class ? LoadKind::kReferrersClass : LoadKind::kDexCacheViaMethod);
     SetPackedFlag<kFlagNeedsAccessCheck>(needs_access_check);
-    SetPackedFlag<kFlagIsInDexCache>(false);
     SetPackedFlag<kFlagIsInBootImage>(false);
     SetPackedFlag<kFlagGenerateClInitCheck>(false);
   }
@@ -5624,13 +5623,18 @@ class HLoadClass FINAL : public HInstruction {
   }
 
   bool CanCallRuntime() const {
-    return MustGenerateClinitCheck() ||
-           (!IsReferrersClass() && !IsInDexCache()) ||
-           NeedsAccessCheck();
+    return NeedsAccessCheck() ||
+           MustGenerateClinitCheck() ||
+           GetLoadKind() == LoadKind::kDexCacheViaMethod;
   }
 
   bool CanThrow() const OVERRIDE {
-    return CanCallRuntime();
+    return NeedsAccessCheck() ||
+           MustGenerateClinitCheck() ||
+           // If the class is in the boot image, the lookup in the runtime call cannot throw.
+           // This keeps CanThrow() consistent between non-PIC (using kBootImageAddress) and
+           // PIC and subsequently avoids a DCE behavior dependency on the PIC option.
+           (GetLoadKind() == LoadKind::kDexCacheViaMethod && !IsInBootImage());
   }
 
   ReferenceTypeInfo GetLoadedClassRTI() {
@@ -5652,7 +5656,7 @@ class HLoadClass FINAL : public HInstruction {
   }
 
   bool NeedsDexCacheOfDeclaringClass() const OVERRIDE {
-    return !IsReferrersClass();
+    return GetLoadKind() == LoadKind::kDexCacheViaMethod;
   }
 
   static SideEffects SideEffectsForArchRuntimeCalls() {
@@ -5661,17 +5665,9 @@ class HLoadClass FINAL : public HInstruction {
 
   bool IsReferrersClass() const { return GetLoadKind() == LoadKind::kReferrersClass; }
   bool NeedsAccessCheck() const { return GetPackedFlag<kFlagNeedsAccessCheck>(); }
-  bool IsInDexCache() const { return GetPackedFlag<kFlagIsInDexCache>(); }
   bool IsInBootImage() const { return GetPackedFlag<kFlagIsInBootImage>(); }
   bool MustGenerateClinitCheck() const { return GetPackedFlag<kFlagGenerateClInitCheck>(); }
 
-  void MarkInDexCache() {
-    SetPackedFlag<kFlagIsInDexCache>(true);
-    DCHECK(!NeedsEnvironment());
-    RemoveEnvironment();
-    SetSideEffects(SideEffects::None());
-  }
-
   void MarkInBootImage() {
     SetPackedFlag<kFlagIsInBootImage>(true);
   }
@@ -5692,8 +5688,7 @@ class HLoadClass FINAL : public HInstruction {
 
  private:
   static constexpr size_t kFlagNeedsAccessCheck    = kNumberOfGenericPackedBits;
-  static constexpr size_t kFlagIsInDexCache        = kFlagNeedsAccessCheck + 1;
-  static constexpr size_t kFlagIsInBootImage       = kFlagIsInDexCache + 1;
+  static constexpr size_t kFlagIsInBootImage       = kFlagNeedsAccessCheck + 1;
   // Whether this instruction must generate the initialization check.
   // Used for code generation.
   static constexpr size_t kFlagGenerateClInitCheck = kFlagIsInBootImage + 1;