8032490: Remove -XX:+-UseOldInlining

Summary: Move the option to obsolete options list, purge the redundant compiler code.
Reviewed-by: kvn, jrose

src/share/vm/opto/bytecodeInfo.cpp

@@ -63,34 +63,14 @@ InlineTree::InlineTree(Compile* c,
   assert(_caller_jvms->same_calls_as(caller_jvms), "consistent JVMS");
   assert((caller_tree == NULL ? 0 : caller_tree->stack_depth() + 1) == stack_depth(), "correct (redundant) depth parameter");
   assert(caller_bci == this->caller_bci(), "correct (redundant) bci parameter");
-  if (UseOldInlining) {
-    // Update hierarchical counts, count_inline_bcs() and count_inlines()
-    InlineTree *caller = (InlineTree *)caller_tree;
-    for( ; caller != NULL; caller = ((InlineTree *)(caller->caller_tree())) ) {
-      caller->_count_inline_bcs += count_inline_bcs();
-      NOT_PRODUCT(caller->_count_inlines++;)
-    }
+  // Update hierarchical counts, count_inline_bcs() and count_inlines()
+  InlineTree *caller = (InlineTree *)caller_tree;
+  for( ; caller != NULL; caller = ((InlineTree *)(caller->caller_tree())) ) {
+    caller->_count_inline_bcs += count_inline_bcs();
+    NOT_PRODUCT(caller->_count_inlines++;)
   }
 }
 
-InlineTree::InlineTree(Compile* c, ciMethod* callee_method, JVMState* caller_jvms,
-                       float site_invoke_ratio, int max_inline_level) :
-  C(c),
-  _caller_jvms(caller_jvms),
-  _caller_tree(NULL),
-  _method(callee_method),
-  _site_invoke_ratio(site_invoke_ratio),
-  _max_inline_level(max_inline_level),
-  _count_inline_bcs(method()->code_size()),
-  _msg(NULL)
-{
-#ifndef PRODUCT
-  _count_inlines = 0;
-  _forced_inline = false;
-#endif
-  assert(!UseOldInlining, "do not use for old stuff");
-}
-
 /**
  *  Return true when EA is ON and a java constructor is called or
  *  a super constructor is called from an inlined java constructor.
@@ -161,11 +141,6 @@ bool InlineTree::should_inline(ciMethod* callee_method, ciMethod* caller_method,
     return true;
   }
 
-  if (!UseOldInlining) {
-    set_msg("!UseOldInlining");
-    return true;  // size and frequency are represented in a new way
-  }
-
   int default_max_inline_size = C->max_inline_size();
   int inline_small_code_size  = InlineSmallCode / 4;
   int max_inline_size         = default_max_inline_size;
@@ -229,35 +204,6 @@ bool InlineTree::should_not_inline(ciMethod *callee_method,
     fail_msg = "don't inline by annotation";
   }
 
-  if (!UseOldInlining) {
-    if (fail_msg != NULL) {
-      *wci_result = *(WarmCallInfo::always_cold());
-      set_msg(fail_msg);
-      return true;
-    }
-
-    if (callee_method->has_unloaded_classes_in_signature()) {
-      wci_result->set_profit(wci_result->profit() * 0.1);
-    }
-
-    // don't inline exception code unless the top method belongs to an
-    // exception class
-    if (callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
-      ciMethod* top_method = jvms->caller() != NULL ? jvms->caller()->of_depth(1)->method() : method();
-      if (!top_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
-        wci_result->set_profit(wci_result->profit() * 0.1);
-      }
-    }
-
-    if (callee_method->has_compiled_code() &&
-        callee_method->instructions_size() > InlineSmallCode) {
-      wci_result->set_profit(wci_result->profit() * 0.1);
-      // %%% adjust wci_result->size()?
-    }
-
-    return false;
-  }
-
   // one more inlining restriction
   if (fail_msg == NULL && callee_method->has_unloaded_classes_in_signature()) {
     fail_msg = "unloaded signature classes";
@@ -360,9 +306,7 @@ bool InlineTree::try_to_inline(ciMethod* callee_method, ciMethod* caller_method,
                                int caller_bci, JVMState* jvms, ciCallProfile& profile,
                                WarmCallInfo* wci_result, bool& should_delay) {
 
-   // Old algorithm had funny accumulating BC-size counters
-  if (UseOldInlining && ClipInlining
-      && (int)count_inline_bcs() >= DesiredMethodLimit) {
+  if (ClipInlining && (int)count_inline_bcs() >= DesiredMethodLimit) {
     if (!callee_method->force_inline() || !IncrementalInline) {
       set_msg("size > DesiredMethodLimit");
       return false;
@@ -465,8 +409,7 @@ bool InlineTree::try_to_inline(ciMethod* callee_method, ciMethod* caller_method,
 
   int size = callee_method->code_size_for_inlining();
 
-  if (UseOldInlining && ClipInlining
-      && (int)count_inline_bcs() + size >= DesiredMethodLimit) {
+  if (ClipInlining && (int)count_inline_bcs() + size >= DesiredMethodLimit) {
     if (!callee_method->force_inline() || !IncrementalInline) {
       set_msg("size > DesiredMethodLimit");
       return false;
@@ -584,8 +527,7 @@ WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms,
                                jvms, profile, &wci, should_delay);
 
 #ifndef PRODUCT
-  if (UseOldInlining && InlineWarmCalls
-      && (PrintOpto || C->print_inlining())) {
+  if (InlineWarmCalls && (PrintOpto || C->print_inlining())) {
     bool cold = wci.is_cold();
     bool hot  = !cold && wci.is_hot();
     bool old_cold = !success;
@@ -599,13 +541,12 @@ WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms,
     }
   }
 #endif
-  if (UseOldInlining) {
-    if (success) {
-      wci = *(WarmCallInfo::always_hot());
-    } else {
-      wci = *(WarmCallInfo::always_cold());
-    }
+  if (success) {
+    wci = *(WarmCallInfo::always_hot());
+  } else {
+    wci = *(WarmCallInfo::always_cold());
   }
+
   if (!InlineWarmCalls) {
     if (!wci.is_cold() && !wci.is_hot()) {
       // Do not inline the warm calls.
@@ -619,8 +560,7 @@ WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms,
       set_msg("inline (hot)");
     }
     print_inlining(callee_method, caller_bci, true /* success */);
-    if (UseOldInlining)
-      build_inline_tree_for_callee(callee_method, jvms, caller_bci);
+    build_inline_tree_for_callee(callee_method, jvms, caller_bci);
     if (InlineWarmCalls && !wci.is_hot())
       return new (C) WarmCallInfo(wci);  // copy to heap
     return WarmCallInfo::always_hot();

src/share/vm/opto/c2_globals.hpp

@@ -350,9 +350,6 @@
           "File to dump ideal graph to.  If set overrides the "             \
           "use of the network")                                             \
                                                                             \
-  product(bool, UseOldInlining, true,                                       \
-          "Enable the 1.3 inlining strategy")                               \
-                                                                            \
   product(bool, UseBimorphicInlining, true,                                 \
           "Profiling based inlining for two receivers")                     \
                                                                             \

src/share/vm/opto/compile.cpp

@@ -701,10 +701,7 @@ Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr
 
   print_compile_messages();
 
-  if (UseOldInlining || PrintCompilation NOT_PRODUCT( || PrintOpto) )
-    _ilt = InlineTree::build_inline_tree_root();
-  else
-    _ilt = NULL;
+  _ilt = InlineTree::build_inline_tree_root();
 
   // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice
   assert(num_alias_types() >= AliasIdxRaw, "");

src/share/vm/opto/doCall.cpp

@@ -161,19 +161,8 @@ CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool
 
     // Try inlining a bytecoded method:
     if (!call_does_dispatch) {
-      InlineTree* ilt;
-      if (UseOldInlining) {
-        ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
-      } else {
-        // Make a disembodied, stateless ILT.
-        // TO DO:  When UseOldInlining is removed, copy the ILT code elsewhere.
-        float site_invoke_ratio = prof_factor;
-        // Note:  ilt is for the root of this parse, not the present call site.
-        ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel);
-      }
+      InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
       WarmCallInfo scratch_ci;
-      if (!UseOldInlining)
-        scratch_ci.init(jvms, callee, profile, prof_factor);
       bool should_delay = false;
       WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay);
       assert(ci != &scratch_ci, "do not let this pointer escape");

src/share/vm/runtime/arguments.cpp

@@ -290,6 +290,7 @@ static ObsoleteFlag obsolete_jvm_flags[] = {
   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
+  { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 #ifdef PRODUCT
   { "DesiredMethodLimit",
                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },