jdk8-mips64-public/hotspot: src/cpu/x86/vm/methodHandles

src/cpu/x86/vm/methodHandles_x86.cpp@1d7922586cf6 (annotated)

src/cpu/x86/vm/methodHandles_x86.cpp

Tue, 24 Jul 2012 10:51:00 -0700

author: twisti
date: Tue, 24 Jul 2012 10:51:00 -0700
changeset 3969: 1d7922586cf6
parent 3566: 45a1bf98f1bb
child 4037: da91efe96a93
permissions: -rw-r--r--

7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>

 /*
  * Copyright (c) 1997, 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 "interpreter/interpreter.hpp"
 #include "interpreter/interpreterRuntime.hpp"
 #include "memory/allocation.inline.hpp"
 #include "prims/methodHandles.hpp"
 #define __ _masm->
 #ifdef PRODUCT
 #define BLOCK_COMMENT(str) /* nothing */
 #define STOP(error) stop(error)
 #else
 #define BLOCK_COMMENT(str) __ block_comment(str)
 #define STOP(error) block_comment(error); __ stop(error)
 #endif
 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
 static RegisterOrConstant constant(int value) {
   return RegisterOrConstant(value);
 }
 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
   if (VerifyMethodHandles)
     verify_klass(_masm, klass_reg, SystemDictionaryHandles::Class_klass(),
                  "MH argument is a Class");
   __ load_heap_oop(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
 }
 #ifdef ASSERT
 static int check_nonzero(const char* xname, int x) {
   assert(x != 0, err_msg("%s should be nonzero", xname));
   return x;
 }
 #define NONZERO(x) check_nonzero(#x, x)
 #else //ASSERT
 #define NONZERO(x) (x)
 #endif //ASSERT
 #ifdef ASSERT
 void MethodHandles::verify_klass(MacroAssembler* _masm,
                                  Register obj, KlassHandle klass,
                                  const char* error_message) {
   oop* klass_addr = klass.raw_value();
   assert(klass_addr >= SystemDictionaryHandles::Object_klass().raw_value() &&
          klass_addr <= SystemDictionaryHandles::Long_klass().raw_value(),
          "must be one of the SystemDictionaryHandles");
   Register temp = rdi;
   Register temp2 = noreg;
   LP64_ONLY(temp2 = rscratch1);  // used by MacroAssembler::cmpptr
   Label L_ok, L_bad;
   BLOCK_COMMENT("verify_klass {");
   __ verify_oop(obj);
   __ testptr(obj, obj);
   __ jcc(Assembler::zero, L_bad);
   __ push(temp); if (temp2 != noreg)  __ push(temp2);
 #define UNPUSH { if (temp2 != noreg)  __ pop(temp2);  __ pop(temp); }
   __ load_klass(temp, obj);
   __ cmpptr(temp, ExternalAddress((address) klass_addr));
   __ jcc(Assembler::equal, L_ok);
   intptr_t super_check_offset = klass->super_check_offset();
   __ movptr(temp, Address(temp, super_check_offset));
   __ cmpptr(temp, ExternalAddress((address) klass_addr));
   __ jcc(Assembler::equal, L_ok);
   UNPUSH;
   __ bind(L_bad);
   __ STOP(error_message);
   __ BIND(L_ok);
   UNPUSH;
   BLOCK_COMMENT("} verify_klass");
 }
 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
   Label L;
   BLOCK_COMMENT("verify_ref_kind {");
   __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
   __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
   __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
   __ cmpl(temp, ref_kind);
   __ jcc(Assembler::equal, L);
   { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
     jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
     if (ref_kind == JVM_REF_invokeVirtual ||
         ref_kind == JVM_REF_invokeSpecial)
       // could do this for all ref_kinds, but would explode assembly code size
       trace_method_handle(_masm, buf);
     __ STOP(buf);
   }
   BLOCK_COMMENT("} verify_ref_kind");
   __ bind(L);
 }
 #endif //ASSERT
 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
                                             bool for_compiler_entry) {
   assert(method == rbx, "interpreter calling convention");
   __ verify_oop(method);
   if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
     Label run_compiled_code;
     // JVMTI events, such as single-stepping, are implemented partly by avoiding running
     // compiled code in threads for which the event is enabled.  Check here for
     // interp_only_mode if these events CAN be enabled.
 #ifdef _LP64
     Register rthread = r15_thread;
 #else
     Register rthread = temp;
     __ get_thread(rthread);
 #endif
     // interp_only is an int, on little endian it is sufficient to test the byte only
     // Is a cmpl faster?
     __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
     __ jccb(Assembler::zero, run_compiled_code);
     __ jmp(Address(method, methodOopDesc::interpreter_entry_offset()));
     __ BIND(run_compiled_code);
   }
   const ByteSize entry_offset = for_compiler_entry ? methodOopDesc::from_compiled_offset() :
                                                      methodOopDesc::from_interpreted_offset();
   __ jmp(Address(method, entry_offset));
 }
 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
                                         Register recv, Register method_temp,
                                         Register temp2,
                                         bool for_compiler_entry) {
   BLOCK_COMMENT("jump_to_lambda_form {");
   // This is the initial entry point of a lazy method handle.
   // After type checking, it picks up the invoker from the LambdaForm.
   assert_different_registers(recv, method_temp, temp2);
   assert(recv != noreg, "required register");
   assert(method_temp == rbx, "required register for loading method");
   //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
   // Load the invoker, as MH -> MH.form -> LF.vmentry
   __ verify_oop(recv);
   __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
   __ verify_oop(method_temp);
   __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
   __ verify_oop(method_temp);
   // the following assumes that a methodOop is normally compressed in the vmtarget field:
   __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
   __ verify_oop(method_temp);
   if (VerifyMethodHandles && !for_compiler_entry) {
     // make sure recv is already on stack
     __ load_sized_value(temp2,
                         Address(method_temp, methodOopDesc::size_of_parameters_offset()),
                         sizeof(u2), /*is_signed*/ false);
     // assert(sizeof(u2) == sizeof(methodOopDesc::_size_of_parameters), "");
     Label L;
     __ cmpptr(recv, __ argument_address(temp2, -1));
     __ jcc(Assembler::equal, L);
     __ movptr(rax, __ argument_address(temp2, -1));
     __ STOP("receiver not on stack");
     __ BIND(L);
   }
   jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
   BLOCK_COMMENT("} jump_to_lambda_form");
 }
 // Code generation
 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
                                                                 vmIntrinsics::ID iid) {
   const bool not_for_compiler_entry = false;  // this is the interpreter entry
   assert(is_signature_polymorphic(iid), "expected invoke iid");
   if (iid == vmIntrinsics::_invokeGeneric ||
       iid == vmIntrinsics::_compiledLambdaForm) {
     // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
     // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
     // They all allow an appendix argument.
     __ hlt();           // empty stubs make SG sick
     return NULL;
   }
   // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
   // rbx: methodOop
   // rdx: argument locator (parameter slot count, added to rsp)
   // rcx: used as temp to hold mh or receiver
   // rax, rdi: garbage temps, blown away
   Register rdx_argp   = rdx;   // argument list ptr, live on error paths
   Register rax_temp   = rax;
   Register rcx_mh     = rcx;   // MH receiver; dies quickly and is recycled
   Register rbx_method = rbx;   // eventual target of this invocation
   address code_start = __ pc();
   // here's where control starts out:
   __ align(CodeEntryAlignment);
   address entry_point = __ pc();
   if (VerifyMethodHandles) {
     Label L;
     BLOCK_COMMENT("verify_intrinsic_id {");
     __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) iid);
     __ jcc(Assembler::equal, L);
     if (iid == vmIntrinsics::_linkToVirtual ||
         iid == vmIntrinsics::_linkToSpecial) {
       // could do this for all kinds, but would explode assembly code size
       trace_method_handle(_masm, "bad methodOop::intrinsic_id");
     }
     __ STOP("bad methodOop::intrinsic_id");
     __ bind(L);
     BLOCK_COMMENT("} verify_intrinsic_id");
   }
   // First task:  Find out how big the argument list is.
   Address rdx_first_arg_addr;
   int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
   assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
   if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
     __ load_sized_value(rdx_argp,
                         Address(rbx_method, methodOopDesc::size_of_parameters_offset()),
                         sizeof(u2), /*is_signed*/ false);
     // assert(sizeof(u2) == sizeof(methodOopDesc::_size_of_parameters), "");
     rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
   } else {
     DEBUG_ONLY(rdx_argp = noreg);
   }
   if (!is_signature_polymorphic_static(iid)) {
     __ movptr(rcx_mh, rdx_first_arg_addr);
     DEBUG_ONLY(rdx_argp = noreg);
   }
   // rdx_first_arg_addr is live!
   if (TraceMethodHandles) {
     const char* name = vmIntrinsics::name_at(iid);
     if (*name == '_')  name += 1;
     const size_t len = strlen(name) + 50;
     char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
     const char* suffix = "";
     if (vmIntrinsics::method_for(iid) == NULL ||
         !vmIntrinsics::method_for(iid)->access_flags().is_public()) {
       if (is_signature_polymorphic_static(iid))
         suffix = "/static";
       else
         suffix = "/private";
     }
     jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
     // note: stub look for mh in rcx
     trace_method_handle(_masm, qname);
   }
   if (iid == vmIntrinsics::_invokeBasic) {
     generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
   } else {
     // Adjust argument list by popping the trailing MemberName argument.
     Register rcx_recv = noreg;
     if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
       // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
       __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
     }
     DEBUG_ONLY(rdx_argp = noreg);
     Register rbx_member = rbx_method;  // MemberName ptr; incoming method ptr is dead now
     __ pop(rax_temp);           // return address
     __ pop(rbx_member);         // extract last argument
     __ push(rax_temp);          // re-push return address
     generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
   }
   if (PrintMethodHandleStubs) {
     address code_end = __ pc();
     tty->print_cr("--------");
     tty->print_cr("method handle interpreter entry for %s", vmIntrinsics::name_at(iid));
     Disassembler::decode(code_start, code_end);
     tty->cr();
   }
   return entry_point;
 }
 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
                                                     vmIntrinsics::ID iid,
                                                     Register receiver_reg,
                                                     Register member_reg,
                                                     bool for_compiler_entry) {
   assert(is_signature_polymorphic(iid), "expected invoke iid");
   Register rbx_method = rbx;   // eventual target of this invocation
   // temps used in this code are not used in *either* compiled or interpreted calling sequences
 #ifdef _LP64
   Register temp1 = rscratch1;
   Register temp2 = rscratch2;
   Register temp3 = rax;
   if (for_compiler_entry) {
     assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
     assert_different_registers(temp1,        j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
     assert_different_registers(temp2,        j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
     assert_different_registers(temp3,        j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
   }
 #else
   Register temp1 = (for_compiler_entry ? rsi : rdx);
   Register temp2 = rdi;
   Register temp3 = rax;
   if (for_compiler_entry) {
     assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
     assert_different_registers(temp1,        rcx, rdx);
     assert_different_registers(temp2,        rcx, rdx);
     assert_different_registers(temp3,        rcx, rdx);
   }
 #endif
   assert_different_registers(temp1, temp2, temp3, receiver_reg);
   assert_different_registers(temp1, temp2, temp3, member_reg);
   if (!for_compiler_entry)
     assert_different_registers(temp1, temp2, temp3, saved_last_sp_register());  // don't trash lastSP
   if (iid == vmIntrinsics::_invokeBasic) {
     // indirect through MH.form.vmentry.vmtarget
     jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
   } else {
     // The method is a member invoker used by direct method handles.
     if (VerifyMethodHandles) {
       // make sure the trailing argument really is a MemberName (caller responsibility)
       verify_klass(_masm, member_reg, SystemDictionaryHandles::MemberName_klass(),
                    "MemberName required for invokeVirtual etc.");
     }
     Address member_clazz(    member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
     Address member_vmindex(  member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
     Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
     Register temp1_recv_klass = temp1;
     if (iid != vmIntrinsics::_linkToStatic) {
       __ verify_oop(receiver_reg);
       if (iid == vmIntrinsics::_linkToSpecial) {
         // Don't actually load the klass; just null-check the receiver.
         __ null_check(receiver_reg);
       } else {
         // load receiver klass itself
         __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
         __ load_klass(temp1_recv_klass, receiver_reg);
         __ verify_oop(temp1_recv_klass);
       }
       BLOCK_COMMENT("check_receiver {");
       // The receiver for the MemberName must be in receiver_reg.
       // Check the receiver against the MemberName.clazz
       if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
         // Did not load it above...
         __ load_klass(temp1_recv_klass, receiver_reg);
         __ verify_oop(temp1_recv_klass);
       }
       if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
         Label L_ok;
         Register temp2_defc = temp2;
         __ load_heap_oop(temp2_defc, member_clazz);
         load_klass_from_Class(_masm, temp2_defc);
         __ verify_oop(temp2_defc);
         __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
         // If we get here, the type check failed!
         __ STOP("receiver class disagrees with MemberName.clazz");
         __ bind(L_ok);
       }
       BLOCK_COMMENT("} check_receiver");
     }
     if (iid == vmIntrinsics::_linkToSpecial ||
         iid == vmIntrinsics::_linkToStatic) {
       DEBUG_ONLY(temp1_recv_klass = noreg);  // these guys didn't load the recv_klass
     }
     // Live registers at this point:
     //  member_reg - MemberName that was the trailing argument
     //  temp1_recv_klass - klass of stacked receiver, if needed
     //  rsi/r13 - interpreter linkage (if interpreted)
     //  rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
     bool method_is_live = false;
     switch (iid) {
     case vmIntrinsics::_linkToSpecial:
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
       }
       __ load_heap_oop(rbx_method, member_vmtarget);
       method_is_live = true;
       break;
     case vmIntrinsics::_linkToStatic:
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
       }
       __ load_heap_oop(rbx_method, member_vmtarget);
       method_is_live = true;
       break;
     case vmIntrinsics::_linkToVirtual:
     {
       // same as TemplateTable::invokevirtual,
       // minus the CP setup and profiling:
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
       }
       // pick out the vtable index from the MemberName, and then we can discard it:
       Register temp2_index = temp2;
       __ movptr(temp2_index, member_vmindex);
       if (VerifyMethodHandles) {
         Label L_index_ok;
         __ cmpl(temp2_index, 0);
         __ jcc(Assembler::greaterEqual, L_index_ok);
         __ STOP("no virtual index");
         __ BIND(L_index_ok);
       }
       // Note:  The verifier invariants allow us to ignore MemberName.clazz and vmtarget
       // at this point.  And VerifyMethodHandles has already checked clazz, if needed.
       // get target methodOop & entry point
       __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
       method_is_live = true;
       break;
     }
     case vmIntrinsics::_linkToInterface:
     {
       // same as TemplateTable::invokeinterface
       // (minus the CP setup and profiling, with different argument motion)
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
       }
       Register temp3_intf = temp3;
       __ load_heap_oop(temp3_intf, member_clazz);
       load_klass_from_Class(_masm, temp3_intf);
       __ verify_oop(temp3_intf);
       Register rbx_index = rbx_method;
       __ movptr(rbx_index, member_vmindex);
       if (VerifyMethodHandles) {
         Label L;
         __ cmpl(rbx_index, 0);
         __ jcc(Assembler::greaterEqual, L);
         __ STOP("invalid vtable index for MH.invokeInterface");
         __ bind(L);
       }
       // given intf, index, and recv klass, dispatch to the implementation method
       Label L_no_such_interface;
       __ lookup_interface_method(temp1_recv_klass, temp3_intf,
                                  // note: next two args must be the same:
                                  rbx_index, rbx_method,
                                  temp2,
                                  L_no_such_interface);
       __ verify_oop(rbx_method);
       jump_from_method_handle(_masm, rbx_method, temp2, for_compiler_entry);
       __ hlt();
       __ bind(L_no_such_interface);
       __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
       break;
     }
     default:
       fatal(err_msg("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
       break;
     }
     if (method_is_live) {
       // live at this point:  rbx_method, rsi/r13 (if interpreted)
       // After figuring out which concrete method to call, jump into it.
       // Note that this works in the interpreter with no data motion.
       // But the compiled version will require that rcx_recv be shifted out.
       __ verify_oop(rbx_method);
       jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
     }
   }
 }
 #ifndef PRODUCT
 void trace_method_handle_stub(const char* adaptername,
                               oop mh,
                               intptr_t* saved_regs,
                               intptr_t* entry_sp) {
   // called as a leaf from native code: do not block the JVM!
   bool has_mh = (strstr(adaptername, "/static") == NULL &&
                  strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH
   const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
   tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
                 adaptername, mh_reg_name,
                 mh, entry_sp);
   if (Verbose) {
     tty->print_cr("Registers:");
     const int saved_regs_count = RegisterImpl::number_of_registers;
     for (int i = 0; i < saved_regs_count; i++) {
       Register r = as_Register(i);
       // The registers are stored in reverse order on the stack (by pusha).
       tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
       if ((i + 1) % 4 == 0) {
         tty->cr();
       } else {
         tty->print(", ");
       }
     }
     tty->cr();
     {
      // dumping last frame with frame::describe
       JavaThread* p = JavaThread::active();
       ResourceMark rm;
       PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
       FrameValues values;
       // Note: We want to allow trace_method_handle from any call site.
       // While trace_method_handle creates a frame, it may be entered
       // without a PC on the stack top (e.g. not just after a call).
       // Walking that frame could lead to failures due to that invalid PC.
       // => carefully detect that frame when doing the stack walking
       // Current C frame
       frame cur_frame = os::current_frame();
       // Robust search of trace_calling_frame (independant of inlining).
       // Assumes saved_regs comes from a pusha in the trace_calling_frame.
       assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
       frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
       while (trace_calling_frame.fp() < saved_regs) {
         trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
       }
       // safely create a frame and call frame::describe
       intptr_t *dump_sp = trace_calling_frame.sender_sp();
       intptr_t *dump_fp = trace_calling_frame.link();
       bool walkable = has_mh; // whether the traced frame shoud be walkable
       if (walkable) {
         // The previous definition of walkable may have to be refined
         // if new call sites cause the next frame constructor to start
         // failing. Alternatively, frame constructors could be
         // modified to support the current or future non walkable
         // frames (but this is more intrusive and is not considered as
         // part of this RFE, which will instead use a simpler output).
         frame dump_frame = frame(dump_sp, dump_fp);
         dump_frame.describe(values, 1);
       } else {
         // Stack may not be walkable (invalid PC above FP):
         // Add descriptions without building a Java frame to avoid issues
         values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
         values.describe(-1, dump_sp, "sp for #1");
       }
       values.describe(-1, entry_sp, "raw top of stack");
       tty->print_cr("Stack layout:");
       values.print(p);
     }
     if (has_mh && mh->is_oop()) {
       mh->print();
       if (java_lang_invoke_MethodHandle::is_instance(mh)) {
         if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
           java_lang_invoke_MethodHandle::form(mh)->print();
       }
     }
   }
 }
 // The stub wraps the arguments in a struct on the stack to avoid
 // dealing with the different calling conventions for passing 6
 // arguments.
 struct MethodHandleStubArguments {
   const char* adaptername;
   oopDesc* mh;
   intptr_t* saved_regs;
   intptr_t* entry_sp;
 };
 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
   trace_method_handle_stub(args->adaptername,
                            args->mh,
                            args->saved_regs,
                            args->entry_sp);
 }
 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
   if (!TraceMethodHandles)  return;
   BLOCK_COMMENT("trace_method_handle {");
   __ enter();
   __ andptr(rsp, -16); // align stack if needed for FPU state
   __ pusha();
   __ mov(rbx, rsp); // for retreiving saved_regs
   // Note: saved_regs must be in the entered frame for the
   // robust stack walking implemented in trace_method_handle_stub.
   // save FP result, valid at some call sites (adapter_opt_return_float, ...)
   __ increment(rsp, -2 * wordSize);
   if  (UseSSE >= 2) {
     __ movdbl(Address(rsp, 0), xmm0);
   } else if (UseSSE == 1) {
     __ movflt(Address(rsp, 0), xmm0);
   } else {
     __ fst_d(Address(rsp, 0));
   }
   // Incoming state:
   // rcx: method handle
   //
   // To avoid calling convention issues, build a record on the stack
   // and pass the pointer to that instead.
   __ push(rbp);               // entry_sp (with extra align space)
   __ push(rbx);               // pusha saved_regs
   __ push(rcx);               // mh
   __ push(rcx);               // slot for adaptername
   __ movptr(Address(rsp, 0), (intptr_t) adaptername);
   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
   __ increment(rsp, sizeof(MethodHandleStubArguments));
   if  (UseSSE >= 2) {
     __ movdbl(xmm0, Address(rsp, 0));
   } else if (UseSSE == 1) {
     __ movflt(xmm0, Address(rsp, 0));
   } else {
     __ fld_d(Address(rsp, 0));
   }
   __ increment(rsp, 2 * wordSize);
   __ popa();
   __ leave();
   BLOCK_COMMENT("} trace_method_handle");
 }
 #endif //PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/methodHandles_x86.cpp@1d7922586cf6 (annotated)

src/cpu/x86/vm/methodHandles_x86.cpp