Mercurial > hg > truffle
view src/cpu/sparc/vm/runtime_sparc.cpp @ 827:bf3489cc0aa0
6856025: assert(_base >= OopPtr && _base <= KlassPtr,"Not a Java pointer")
Reviewed-by: kvn
author | never |
---|---|
date | Wed, 01 Jul 2009 12:22:23 -0700 |
parents | 6b2273dd6fa9 |
children | c18cbe5936b8 110501f54a99 |
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/* * Copyright 1998-2009 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/_runtime_sparc.cpp.incl" #define __ masm-> ExceptionBlob *OptoRuntime::_exception_blob; //------------------------------ generate_exception_blob --------------------------- // creates exception blob at the end // Using exception blob, this code is jumped from a compiled method. // (see emit_exception_handler in sparc.ad file) // // Given an exception pc at a call we call into the runtime for the // handler in this method. This handler might merely restore state // (i.e. callee save registers) unwind the frame and jump to the // exception handler for the nmethod if there is no Java level handler // for the nmethod. // // This code is entered with a jmp. // // Arguments: // O0: exception oop // O1: exception pc // // Results: // O0: exception oop // O1: exception pc in caller or ??? // destination: exception handler of caller // // Note: the exception pc MUST be at a call (precise debug information) // void OptoRuntime::generate_exception_blob() { // allocate space for code ResourceMark rm; int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code // setup code generation tools // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread) // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread) CodeBuffer buffer("exception_blob", 600+pad, 512); MacroAssembler* masm = new MacroAssembler(&buffer); int framesize_in_bytes = __ total_frame_size_in_bytes(0); int framesize_in_words = framesize_in_bytes / wordSize; int framesize_in_slots = framesize_in_bytes / sizeof(jint); Label L; int start = __ offset(); __ verify_thread(); __ st_ptr(Oexception, G2_thread, JavaThread::exception_oop_offset()); __ st_ptr(Oissuing_pc, G2_thread, JavaThread::exception_pc_offset()); // This call does all the hard work. It checks if an exception catch // exists in the method. // If so, it returns the handler address. // If the nmethod has been deoptimized and it had a handler the handler // address is the deopt blob unpack_with_exception entry. // // If no handler exists it prepares for stack-unwinding, restoring the callee-save // registers of the frame being removed. // __ save_frame(0); __ mov(G2_thread, O0); __ set_last_Java_frame(SP, noreg); __ save_thread(L7_thread_cache); // This call can block at exit and nmethod can be deoptimized at that // point. If the nmethod had a catch point we would jump to the // now deoptimized catch point and fall thru the vanilla deopt // path and lose the exception // Sure would be simpler if this call didn't block! __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type); __ delayed()->mov(L7_thread_cache, O0); // Set an oopmap for the call site. This oopmap will only be used if we // are unwinding the stack. Hence, all locations will be dead. // Callee-saved registers will be the same as the frame above (i.e., // handle_exception_stub), since they were restored when we got the // exception. OopMapSet *oop_maps = new OopMapSet(); oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0)); __ bind(L); __ restore_thread(L7_thread_cache); __ reset_last_Java_frame(); __ mov(O0, G3_scratch); // Move handler address to temp __ restore(); // G3_scratch contains handler address // Since this may be the deopt blob we must set O7 to look like we returned // from the original pc that threw the exception __ ld_ptr(G2_thread, JavaThread::exception_pc_offset(), O7); __ sub(O7, frame::pc_return_offset, O7); assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot"); __ ld_ptr(G2_thread, JavaThread::exception_oop_offset(), Oexception); // O0 #ifdef ASSERT __ st_ptr(G0, G2_thread, JavaThread::exception_handler_pc_offset()); __ st_ptr(G0, G2_thread, JavaThread::exception_pc_offset()); #endif __ JMP(G3_scratch, 0); // Clear the exception oop so GC no longer processes it as a root. __ delayed()->st_ptr(G0, G2_thread, JavaThread::exception_oop_offset()); // ------------- // make sure all code is generated masm->flush(); _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words); }