hotspot/src/cpu/ppc/vm/runtime_ppc.cpp
author goetz
Wed, 11 Dec 2013 00:06:11 +0100
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8029940: PPC64 (part 122): C2 compiler port Reviewed-by: kvn
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/*
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 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
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 * Copyright 2012, 2013 SAP AG. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#ifdef COMPILER2
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#include "asm/assembler.inline.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "code/vmreg.hpp"
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#include "interpreter/interpreter.hpp"
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#include "nativeInst_ppc.hpp"
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#include "opto/runtime.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/vframeArray.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "vmreg_ppc.inline.hpp"
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#endif
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#define __ masm->
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#ifdef COMPILER2
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// SP adjustment (must use unextended SP) for method handle call sites
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// during exception handling.
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static intptr_t adjust_SP_for_methodhandle_callsite(JavaThread *thread) {
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  RegisterMap map(thread, false);
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  // The frame constructor will do the correction for us (see frame::adjust_unextended_SP).
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  frame mh_caller_frame = thread->last_frame().sender(&map);
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  assert(mh_caller_frame.is_compiled_frame(), "Only may reach here for compiled MH call sites");
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  return (intptr_t) mh_caller_frame.unextended_sp();
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}
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//------------------------------generate_exception_blob---------------------------
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// Creates exception blob at the end.
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// Using exception blob, this code is jumped from a compiled method.
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//
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// Given an exception pc at a call we call into the runtime for the
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// handler in this method. This handler might merely restore state
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// (i.e. callee save registers) unwind the frame and jump to the
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// exception handler for the nmethod if there is no Java level handler
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// for the nmethod.
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//
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// This code is entered with a jmp.
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//
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// Arguments:
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//   R3_ARG1: exception oop
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//   R4_ARG2: exception pc
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//
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// Results:
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//   R3_ARG1: exception oop
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//   R4_ARG2: exception pc in caller
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//   destination: exception handler of caller
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//
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// Note: the exception pc MUST be at a call (precise debug information)
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//
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void OptoRuntime::generate_exception_blob() {
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  // Allocate space for the code.
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  ResourceMark rm;
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  // Setup code generation tools.
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  CodeBuffer buffer("exception_blob", 2048, 1024);
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  InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
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  address start = __ pc();
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  int frame_size_in_bytes = frame::abi_112_size;
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  OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
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  // Exception pc is 'return address' for stack walker.
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  __ std(R4_ARG2/*exception pc*/, _abi(lr), R1_SP);
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  // Store the exception in the Thread object.
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  __ std(R3_ARG1/*exception oop*/, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
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  __ std(R4_ARG2/*exception pc*/,  in_bytes(JavaThread::exception_pc_offset()),  R16_thread);
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  // Save callee-saved registers.
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  // Push a C frame for the exception blob. It is needed for the C call later on.
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  __ push_frame_abi112(0, R11_scratch1);
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  // This call does all the hard work. It checks if an exception handler
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  // exists in the method.
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  // If so, it returns the handler address.
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  // If not, it prepares for stack-unwinding, restoring the callee-save
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  // registers of the frame being removed.
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  __ set_last_Java_frame(/*sp=*/R1_SP, noreg);
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  __ mr(R3_ARG1, R16_thread);
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  __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, OptoRuntime::handle_exception_C),
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            relocInfo::none);
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  address calls_return_pc = __ last_calls_return_pc();
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# ifdef ASSERT
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  __ cmpdi(CCR0, R3_RET, 0);
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  __ asm_assert_ne("handle_exception_C must not return NULL", 0x601);
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# endif
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  // Set an oopmap for the call site. This oopmap will only be used if we
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  // are unwinding the stack. Hence, all locations will be dead.
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  // Callee-saved registers will be the same as the frame above (i.e.,
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  // handle_exception_stub), since they were restored when we got the
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  // exception.
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  OopMapSet* oop_maps = new OopMapSet();
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  oop_maps->add_gc_map(calls_return_pc - start, map);
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  // Get unextended_sp for method handle call sites.
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  Label mh_callsite, mh_done; // Use a 2nd c call if it's a method handle call site.
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  __ lwa(R4_ARG2, in_bytes(JavaThread::is_method_handle_return_offset()), R16_thread);
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  __ cmpwi(CCR0, R4_ARG2, 0);
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  __ bne(CCR0, mh_callsite);
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  __ mtctr(R3_RET); // Move address of exception handler to SR_CTR.
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  __ reset_last_Java_frame();
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  __ pop_frame();
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  __ bind(mh_done);
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  // We have a handler in register SR_CTR (could be deopt blob).
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  // Get the exception oop.
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  __ ld(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
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  // Get the exception pc in case we are deoptimized.
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  __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
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  // Reset thread values.
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  __ li(R0, 0);
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#ifdef ASSERT
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  __ std(R0, in_bytes(JavaThread::exception_handler_pc_offset()), R16_thread);
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  __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
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#endif
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  // Clear the exception oop so GC no longer processes it as a root.
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  __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
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  // Move exception pc into SR_LR.
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  __ mtlr(R4_ARG2);
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  __ bctr();
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  // Same as above, but also set sp to unextended_sp.
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  __ bind(mh_callsite);
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  __ mr(R31, R3_RET); // Save branch address.
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  __ mr(R3_ARG1, R16_thread);
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  __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, adjust_SP_for_methodhandle_callsite), relocInfo::none);
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  // Returns unextended_sp in R3_RET.
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  __ mtctr(R31); // Move address of exception handler to SR_CTR.
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  __ reset_last_Java_frame();
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  __ mr(R1_SP, R3_RET); // Set sp to unextended_sp.
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  __ b(mh_done);
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  // Make sure all code is generated.
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  masm->flush();
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  // Set exception blob.
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  _exception_blob = ExceptionBlob::create(&buffer, oop_maps,
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                                          frame_size_in_bytes/wordSize);
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}
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#endif // COMPILER2