Mercurial > hg > truffle
diff src/cpu/sparc/vm/runtime_sparc.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 6b2273dd6fa9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/sparc/vm/runtime_sparc.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,142 @@ +/* + * Copyright 1998-2006 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/_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, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset()))); + __ st_ptr(Oissuing_pc, Address(G2_thread, 0, in_bytes(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(Address(G2_thread, 0, in_bytes(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(Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())), Oexception); // O0 +#ifdef ASSERT + __ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_handler_pc_offset()))); + __ st_ptr(G0, Address(G2_thread, 0, in_bytes(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, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset()))); + + // ------------- + // make sure all code is generated + masm->flush(); + + _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words); +}