8047362: Add a version of CompiledIC_at that doesn't create a new RelocIterator

Reviewed-by: iveresov, mgerdin

src/share/vm/code/codeCache.cpp

@@ -494,7 +494,7 @@ void CodeCache::gc_epilogue() {
       while(iter.next()) {
         if (iter.type() == relocInfo::virtual_call_type) {
           if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
-            CompiledIC *ic = CompiledIC_at(iter.reloc());
+            CompiledIC *ic = CompiledIC_at(&iter);
             if (TraceCompiledIC) {
               tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
               ic->print();

src/share/vm/code/compiledIC.cpp

@@ -159,10 +159,24 @@ address CompiledIC::stub_address() const {
 //-----------------------------------------------------------------------------
 // High-level access to an inline cache. Guaranteed to be MT-safe.
 
+void CompiledIC::initialize_from_iter(RelocIterator* iter) {
+  assert(iter->addr() == _ic_call->instruction_address(), "must find ic_call");
+
+  if (iter->type() == relocInfo::virtual_call_type) {
+    virtual_call_Relocation* r = iter->virtual_call_reloc();
+    _is_optimized = false;
+    _value = nativeMovConstReg_at(r->cached_value());
+  } else {
+    assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
+    _is_optimized = true;
+    _value = NULL;
+  }
+}
+
 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
   : _ic_call(call)
 {
-  address ic_call = call->instruction_address();
+  address ic_call = _ic_call->instruction_address();
 
   assert(ic_call != NULL, "ic_call address must be set");
   assert(nm != NULL, "must pass nmethod");
@@ -173,15 +187,21 @@ CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
   bool ret = iter.next();
   assert(ret == true, "relocInfo must exist at this address");
   assert(iter.addr() == ic_call, "must find ic_call");
-  if (iter.type() == relocInfo::virtual_call_type) {
-    virtual_call_Relocation* r = iter.virtual_call_reloc();
-    _is_optimized = false;
-    _value = nativeMovConstReg_at(r->cached_value());
-  } else {
-    assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
-    _is_optimized = true;
-    _value = NULL;
-  }
+
+  initialize_from_iter(&iter);
+}
+
+CompiledIC::CompiledIC(RelocIterator* iter)
+  : _ic_call(nativeCall_at(iter->addr()))
+{
+  address ic_call = _ic_call->instruction_address();
+
+  nmethod* nm = iter->code();
+  assert(ic_call != NULL, "ic_call address must be set");
+  assert(nm != NULL, "must pass nmethod");
+  assert(nm->contains(ic_call), "must be in nmethod");
+
+  initialize_from_iter(iter);
 }
 
 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {

src/share/vm/code/compiledIC.hpp

@@ -150,6 +150,9 @@ class CompiledIC: public ResourceObj {
   bool          _is_optimized;  // an optimized virtual call (i.e., no compiled IC)
 
   CompiledIC(nmethod* nm, NativeCall* ic_call);
+  CompiledIC(RelocIterator* iter);
+
+  void initialize_from_iter(RelocIterator* iter);
 
   static bool is_icholder_entry(address entry);
 
@@ -183,6 +186,7 @@ class CompiledIC: public ResourceObj {
   friend CompiledIC* CompiledIC_before(nmethod* nm, address return_addr);
   friend CompiledIC* CompiledIC_at(nmethod* nm, address call_site);
   friend CompiledIC* CompiledIC_at(Relocation* call_site);
+  friend CompiledIC* CompiledIC_at(RelocIterator* reloc_iter);
 
   // This is used to release CompiledICHolder*s from nmethods that
   // are about to be freed.  The callsite might contain other stale
@@ -263,6 +267,13 @@ inline CompiledIC* CompiledIC_at(Relocation* call_site) {
   return c_ic;
 }
 
+inline CompiledIC* CompiledIC_at(RelocIterator* reloc_iter) {
+  assert(reloc_iter->type() == relocInfo::virtual_call_type ||
+      reloc_iter->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info");
+  CompiledIC* c_ic = new CompiledIC(reloc_iter);
+  c_ic->verify();
+  return c_ic;
+}
 
 //-----------------------------------------------------------------------------
 // The CompiledStaticCall represents a call to a static method in the compiled

src/share/vm/code/nmethod.cpp

@@ -1166,7 +1166,7 @@ void nmethod::cleanup_inline_caches() {
     switch(iter.type()) {
       case relocInfo::virtual_call_type:
       case relocInfo::opt_virtual_call_type: {
-        CompiledIC *ic = CompiledIC_at(iter.reloc());
+        CompiledIC *ic = CompiledIC_at(&iter);
         // Ok, to lookup references to zombies here
         CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
         if( cb != NULL && cb->is_nmethod() ) {
@@ -1663,7 +1663,7 @@ void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred)
     RelocIterator iter(this, low_boundary);
     while(iter.next()) {
       if (iter.type() == relocInfo::virtual_call_type) {
-        CompiledIC *ic = CompiledIC_at(iter.reloc());
+        CompiledIC *ic = CompiledIC_at(&iter);
         if (ic->is_icholder_call()) {
           // The only exception is compiledICHolder oops which may
           // yet be marked below. (We check this further below).
@@ -1772,7 +1772,7 @@ void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* i
     // compiled code is maintaining a link to dead metadata.
     address static_call_addr = NULL;
     if (iter.type() == relocInfo::opt_virtual_call_type) {
-      CompiledIC* cic = CompiledIC_at(iter.reloc());
+      CompiledIC* cic = CompiledIC_at(&iter);
       if (!cic->is_call_to_interpreted()) {
         static_call_addr = iter.addr();
       }
@@ -1824,7 +1824,7 @@ void nmethod::metadata_do(void f(Metadata*)) {
         }
       } else if (iter.type() == relocInfo::virtual_call_type) {
         // Check compiledIC holders associated with this nmethod
-        CompiledIC *ic = CompiledIC_at(iter.reloc());
+        CompiledIC *ic = CompiledIC_at(&iter);
         if (ic->is_icholder_call()) {
           CompiledICHolder* cichk = ic->cached_icholder();
           f(cichk->holder_method());
@@ -2927,7 +2927,7 @@ void nmethod::print_calls(outputStream* st) {
     case relocInfo::virtual_call_type:
     case relocInfo::opt_virtual_call_type: {
       VerifyMutexLocker mc(CompiledIC_lock);
-      CompiledIC_at(iter.reloc())->print();
+      CompiledIC_at(&iter)->print();
       break;
     }
     case relocInfo::static_call_type: