/* * Copyright (c) 1999, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "opto/addnode.hpp" #include "opto/callnode.hpp" #include "opto/cfgnode.hpp" #include "opto/compile.hpp" #include "opto/connode.hpp" #include "opto/locknode.hpp" #include "opto/memnode.hpp" #include "opto/mulnode.hpp" #include "opto/node.hpp" #include "opto/parse.hpp" #include "opto/phaseX.hpp" #include "opto/rootnode.hpp" #include "opto/runtime.hpp" #include "opto/type.hpp" //--------------------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) 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) 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) ParmNode(start, i))); for( ; ireq(); 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) 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( ; cntfield_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) 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; iinit_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( ; iinit_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) ProjNode(call,TypeFunc::Control)) ); set_i_o( _gvn.transform( new (C) ProjNode(call,TypeFunc::I_O )) ); set_all_memory_call(call); if (range->cnt() > TypeFunc::Parms) { Node* retnode = _gvn.transform( new (C) 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) AndINode(retnode, intcon(0xFF)) ); } else if (retval == TypeInt::CHAR) { retnode = _gvn.transform( new (C) AndINode(retnode, intcon(0xFFFF)) ); } else if (retval == TypeInt::BYTE) { retnode = _gvn.transform( new (C) LShiftINode(retnode, intcon(24)) ); retnode = _gvn.transform( new (C) RShiftINode(retnode, intcon(24)) ); } else if (retval == TypeInt::SHORT) { retnode = _gvn.transform( new (C) LShiftINode(retnode, intcon(16)) ); retnode = _gvn.transform( new (C) 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) CmpPNode(pending, null()) ); Node* bo = _gvn.transform( new (C) BoolNode(cmp, BoolTest::ne) ); IfNode *iff = create_and_map_if(control(), bo, PROB_MIN, COUNT_UNKNOWN); Node* if_null = _gvn.transform( new (C) IfFalseNode(iff) ); Node* if_not_null = _gvn.transform( new (C) 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) 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) 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) 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) TailJumpNode(if_null, i_o(), exit_memory, frameptr(), target, map()->in(TypeFunc::Parms)); break; default: ShouldNotReachHere(); } root()->add_req(_gvn.transform(ret)); }