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hotspot/src/share/vm/opto/generateOptoStub.cpp

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+/*
+ * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_generateOptoStub.cpp.incl"
+
+//--------------------gen_stub-------------------------------
+void GraphKit::gen_stub(address C_function,
+                        const char *name,
+                        int is_fancy_jump,
+                        bool pass_tls,
+                        bool return_pc) {
+  ResourceMark rm;
+
+  const TypeTuple *jdomain = C->tf()->domain();
+  const TypeTuple *jrange  = C->tf()->range();
+
+  // The procedure start
+  StartNode* start = new (C, 2) StartNode(root(), jdomain);
+  _gvn.set_type_bottom(start);
+
+  // Make a map, with JVM state
+  uint parm_cnt = jdomain->cnt();
+  uint max_map = MAX2(2*parm_cnt+1, jrange->cnt());
+  // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces
+  assert(SynchronizationEntryBCI == InvocationEntryBci, "");
+  JVMState* jvms = new (C) JVMState(0);
+  jvms->set_bci(InvocationEntryBci);
+  jvms->set_monoff(max_map);
+  jvms->set_endoff(max_map);
+  {
+    SafePointNode *map = new (C, max_map) SafePointNode( max_map, jvms );
+    jvms->set_map(map);
+    set_jvms(jvms);
+    assert(map == this->map(), "kit.map is set");
+  }
+
+  // Make up the parameters
+  uint i;
+  for( i = 0; i < parm_cnt; i++ )
+    map()->init_req(i, _gvn.transform(new (C, 1) ParmNode(start, i)));
+  for( ; i<map()->req(); i++ )
+    map()->init_req(i, top());      // For nicer debugging
+
+  // GraphKit requires memory to be a MergeMemNode:
+  set_all_memory(map()->memory());
+
+  // Get base of thread-local storage area
+  Node* thread = _gvn.transform( new (C, 1) ThreadLocalNode() );
+
+  const int NoAlias = Compile::AliasIdxBot;
+
+  Node* adr_last_Java_pc = basic_plus_adr(top(),
+                                            thread,
+                                            in_bytes(JavaThread::frame_anchor_offset()) +
+                                            in_bytes(JavaFrameAnchor::last_Java_pc_offset()));
+#if defined(SPARC) || defined(IA64)
+  Node* adr_flags = basic_plus_adr(top(),
+                                   thread,
+                                   in_bytes(JavaThread::frame_anchor_offset()) +
+                                   in_bytes(JavaFrameAnchor::flags_offset()));
+#endif /* defined(SPARC) || defined(IA64) */
+
+
+  // Drop in the last_Java_sp.  last_Java_fp is not touched.
+  // Always do this after the other "last_Java_frame" fields are set since
+  // as soon as last_Java_sp != NULL the has_last_Java_frame is true and
+  // users will look at the other fields.
+  //
+  Node *adr_sp = basic_plus_adr(top(), thread, in_bytes(JavaThread::last_Java_sp_offset()));
+#ifndef IA64
+  Node *last_sp = basic_plus_adr(top(), frameptr(), (intptr_t) STACK_BIAS);
+  store_to_memory(NULL, adr_sp, last_sp, T_ADDRESS, NoAlias);
+#endif
+
+  // Set _thread_in_native
+  // The order of stores into TLS is critical!  Setting _thread_in_native MUST
+  // be last, because a GC is allowed at any time after setting it and the GC
+  // will require last_Java_pc and last_Java_sp.
+  Node* adr_state = basic_plus_adr(top(), thread, in_bytes(JavaThread::thread_state_offset()));
+
+  //-----------------------------
+  // Compute signature for C call.  Varies from the Java signature!
+  const Type **fields = TypeTuple::fields(2*parm_cnt+2);
+  uint cnt = TypeFunc::Parms;
+  // The C routines gets the base of thread-local storage passed in as an
+  // extra argument.  Not all calls need it, but its cheap to add here.
+  for( ; cnt<parm_cnt; cnt++ )
+    fields[cnt] = jdomain->field_at(cnt);
+  fields[cnt++] = TypeRawPtr::BOTTOM; // Thread-local storage
+  // Also pass in the caller's PC, if asked for.
+  if( return_pc )
+    fields[cnt++] = TypeRawPtr::BOTTOM; // Return PC
+
+  const TypeTuple* domain = TypeTuple::make(cnt,fields);
+  // The C routine we are about to call cannot return an oop; it can block on
+  // exit and a GC will trash the oop while it sits in C-land.  Instead, we
+  // return the oop through TLS for runtime calls.
+  // Also, C routines returning integer subword values leave the high
+  // order bits dirty; these must be cleaned up by explicit sign extension.
+  const Type* retval = (jrange->cnt() == TypeFunc::Parms) ? Type::TOP : jrange->field_at(TypeFunc::Parms);
+  // Make a private copy of jrange->fields();
+  const Type **rfields = TypeTuple::fields(jrange->cnt() - TypeFunc::Parms);
+  // Fixup oop returns
+  int retval_ptr = retval->isa_oop_ptr();
+  if( retval_ptr ) {
+    assert( pass_tls, "Oop must be returned thru TLS" );
+    // Fancy-jumps return address; others return void
+    rfields[TypeFunc::Parms] = is_fancy_jump ? TypeRawPtr::BOTTOM : Type::TOP;
+
+  } else if( retval->isa_int() ) { // Returning any integer subtype?
+    // "Fatten" byte, char & short return types to 'int' to show that
+    // the native C code can return values with junk high order bits.
+    // We'll sign-extend it below later.
+    rfields[TypeFunc::Parms] = TypeInt::INT; // It's "dirty" and needs sign-ext
+
+  } else if( jrange->cnt() >= TypeFunc::Parms+1 ) { // Else copy other types
+    rfields[TypeFunc::Parms] = jrange->field_at(TypeFunc::Parms);
+    if( jrange->cnt() == TypeFunc::Parms+2 )
+      rfields[TypeFunc::Parms+1] = jrange->field_at(TypeFunc::Parms+1);
+  }
+  const TypeTuple* range = TypeTuple::make(jrange->cnt(),rfields);
+
+  // Final C signature
+  const TypeFunc *c_sig = TypeFunc::make(domain,range);
+
+  //-----------------------------
+  // Make the call node
+  CallRuntimeNode *call = new (C, c_sig->domain()->cnt())
+    CallRuntimeNode(c_sig, C_function, name, TypePtr::BOTTOM);
+  //-----------------------------
+
+  // Fix-up the debug info for the call
+  call->set_jvms( new (C) JVMState(0) );
+  call->jvms()->set_bci(0);
+  call->jvms()->set_offsets(cnt);
+
+  // Set fixed predefined input arguments
+  cnt = 0;
+  for( i=0; i<TypeFunc::Parms; i++ )
+    call->init_req( cnt++, map()->in(i) );
+  // A little too aggressive on the parm copy; return address is not an input
+  call->set_req(TypeFunc::ReturnAdr, top());
+  for( ; i<parm_cnt; i++ )    // Regular input arguments
+    call->init_req( cnt++, map()->in(i) );
+
+  call->init_req( cnt++, thread );
+  if( return_pc )             // Return PC, if asked for
+    call->init_req( cnt++, returnadr() );
+  _gvn.transform_no_reclaim(call);
+
+
+  //-----------------------------
+  // Now set up the return results
+  set_control( _gvn.transform( new (C, 1) ProjNode(call,TypeFunc::Control)) );
+  set_i_o(     _gvn.transform( new (C, 1) ProjNode(call,TypeFunc::I_O    )) );
+  set_all_memory_call(call);
+  if (range->cnt() > TypeFunc::Parms) {
+    Node* retnode = _gvn.transform( new (C, 1) ProjNode(call,TypeFunc::Parms) );
+    // C-land is allowed to return sub-word values.  Convert to integer type.
+    assert( retval != Type::TOP, "" );
+    if (retval == TypeInt::BOOL) {
+      retnode = _gvn.transform( new (C, 3) AndINode(retnode, intcon(0xFF)) );
+    } else if (retval == TypeInt::CHAR) {
+      retnode = _gvn.transform( new (C, 3) AndINode(retnode, intcon(0xFFFF)) );
+    } else if (retval == TypeInt::BYTE) {
+      retnode = _gvn.transform( new (C, 3) LShiftINode(retnode, intcon(24)) );
+      retnode = _gvn.transform( new (C, 3) RShiftINode(retnode, intcon(24)) );
+    } else if (retval == TypeInt::SHORT) {
+      retnode = _gvn.transform( new (C, 3) LShiftINode(retnode, intcon(16)) );
+      retnode = _gvn.transform( new (C, 3) RShiftINode(retnode, intcon(16)) );
+    }
+    map()->set_req( TypeFunc::Parms, retnode );
+  }
+
+  //-----------------------------
+
+  // Clear last_Java_sp
+#ifdef IA64
+  if( os::is_MP() ) insert_mem_bar(Op_MemBarRelease);
+#endif
+
+  store_to_memory(NULL, adr_sp, null(), T_ADDRESS, NoAlias);
+#ifdef IA64
+  if (os::is_MP() && UseMembar) insert_mem_bar(new MemBarVolatileNode());
+#endif // def IA64
+  // Clear last_Java_pc and (optionally)_flags
+  store_to_memory(NULL, adr_last_Java_pc, null(), T_ADDRESS, NoAlias);
+#if defined(SPARC) || defined(IA64)
+  store_to_memory(NULL, adr_flags, intcon(0), T_INT, NoAlias);
+#endif /* defined(SPARC) || defined(IA64) */
+#ifdef IA64
+  Node* adr_last_Java_fp = basic_plus_adr(top(), thread, in_bytes(JavaThread::last_Java_fp_offset()));
+  if( os::is_MP() ) insert_mem_bar(Op_MemBarRelease);
+  store_to_memory(NULL, adr_last_Java_fp,    null(),    T_ADDRESS, NoAlias);
+#endif
+
+  // For is-fancy-jump, the C-return value is also the branch target
+  Node* target = map()->in(TypeFunc::Parms);
+  // Runtime call returning oop in TLS?  Fetch it out
+  if( pass_tls ) {
+    Node* adr = basic_plus_adr(top(), thread, in_bytes(JavaThread::vm_result_offset()));
+    Node* vm_result = make_load(NULL, adr, TypeOopPtr::BOTTOM, T_OBJECT, NoAlias, false);
+    map()->set_req(TypeFunc::Parms, vm_result); // vm_result passed as result
+    // clear thread-local-storage(tls)
+    store_to_memory(NULL, adr, null(), T_ADDRESS, NoAlias);
+  }
+
+  //-----------------------------
+  // check exception
+  Node* adr = basic_plus_adr(top(), thread, in_bytes(Thread::pending_exception_offset()));
+  Node* pending = make_load(NULL, adr, TypeOopPtr::BOTTOM, T_OBJECT, NoAlias, false);
+
+  Node* exit_memory = reset_memory();
+
+  Node* cmp = _gvn.transform( new (C, 3) CmpPNode(pending, null()) );
+  Node* bo  = _gvn.transform( new (C, 2) BoolNode(cmp, BoolTest::ne) );
+  IfNode   *iff = create_and_map_if(control(), bo, PROB_MIN, COUNT_UNKNOWN);
+
+  Node* if_null     = _gvn.transform( new (C, 1) IfFalseNode(iff) );
+  Node* if_not_null = _gvn.transform( new (C, 1) IfTrueNode(iff)  );
+
+  assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before");
+  Node *exc_target = makecon(TypeRawPtr::make( StubRoutines::forward_exception_entry() ));
+  Node *to_exc = new (C, TypeFunc::Parms+2) TailCallNode(if_not_null,
+                                  i_o(),
+                                  exit_memory,
+                                  frameptr(),
+                                  returnadr(),
+                                  exc_target, null());
+  root()->add_req(_gvn.transform(to_exc));  // bind to root to keep live
+  C->init_start(start);
+
+  //-----------------------------
+  // If this is a normal subroutine return, issue the return and be done.
+  Node *ret;
+  switch( is_fancy_jump ) {
+  case 0:                       // Make a return instruction
+    // Return to caller, free any space for return address
+    ret = new (C, TypeFunc::Parms) ReturnNode(TypeFunc::Parms, if_null,
+                         i_o(),
+                         exit_memory,
+                         frameptr(),
+                         returnadr());
+    if (C->tf()->range()->cnt() > TypeFunc::Parms)
+      ret->add_req( map()->in(TypeFunc::Parms) );
+    break;
+  case 1:    // This is a fancy tail-call jump.  Jump to computed address.
+    // Jump to new callee; leave old return address alone.
+    ret = new (C, TypeFunc::Parms+2) TailCallNode(if_null,
+                           i_o(),
+                           exit_memory,
+                           frameptr(),
+                           returnadr(),
+                           target, map()->in(TypeFunc::Parms));
+    break;
+  case 2:                       // Pop return address & jump
+    // Throw away old return address; jump to new computed address
+    //assert(C_function == CAST_FROM_FN_PTR(address, OptoRuntime::rethrow_C), "fancy_jump==2 only for rethrow");
+    ret = new (C, TypeFunc::Parms+2) TailJumpNode(if_null,
+                           i_o(),
+                           exit_memory,
+                           frameptr(),
+                           target, map()->in(TypeFunc::Parms));
+    break;
+  default:
+    ShouldNotReachHere();
+  }
+  root()->add_req(_gvn.transform(ret));
+}