/*

 * Copyright (c) 2015, 2018, 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 "jvmci/jvmciCodeInstaller.hpp"

#include "jvmci/jvmciRuntime.hpp"

#include "jvmci/jvmciCompilerToVM.hpp"

#include "jvmci/jvmciJavaClasses.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/sharedRuntime.hpp"

#include "vmreg_aarch64.inline.hpp"

jint CodeInstaller::pd_next_offset(NativeInstruction* inst, jint pc_offset, Handle method, TRAPS) {

  if (inst->is_call() || inst->is_jump() || inst->is_blr()) {

    return pc_offset + NativeCall::instruction_size;

  } else if (inst->is_general_jump()) {

    return pc_offset + NativeGeneralJump::instruction_size;

  } else {

    JVMCI_ERROR_0("unsupported type of instruction for call site");

  }

}

void CodeInstaller::pd_patch_OopConstant(int pc_offset, Handle constant, TRAPS) {

  address pc = _instructions->start() + pc_offset;

#ifdef ASSERT

  {

    NativeInstruction *insn = nativeInstruction_at(pc);

    if (HotSpotObjectConstantImpl::compressed(constant)) {

      // Mov narrow constant: movz n << 16, movk

      assert(Instruction_aarch64::extract(insn->encoding(), 31, 21) == 0b11010010101 &&

             nativeInstruction_at(pc+4)->is_movk(), "wrong insn in patch");

    } else {

      // Move wide constant: movz n, movk, movk.

      assert(nativeInstruction_at(pc+4)->is_movk()

             && nativeInstruction_at(pc+8)->is_movk(), "wrong insn in patch");

    }

  }

#endif // ASSERT

  Handle obj(THREAD, HotSpotObjectConstantImpl::object(constant));

  jobject value = JNIHandles::make_local(obj());

  MacroAssembler::patch_oop(pc, (address)obj());

  int oop_index = _oop_recorder->find_index(value);

  RelocationHolder rspec = oop_Relocation::spec(oop_index);

  _instructions->relocate(pc, rspec);

}

void CodeInstaller::pd_patch_MetaspaceConstant(int pc_offset, Handle constant, TRAPS) {

  address pc = _instructions->start() + pc_offset;

  if (HotSpotMetaspaceConstantImpl::compressed(constant)) {

    narrowKlass narrowOop = record_narrow_metadata_reference(_instructions, pc, constant, CHECK);

    MacroAssembler::patch_narrow_klass(pc, narrowOop);

    TRACE_jvmci_3("relocating (narrow metaspace constant) at " PTR_FORMAT "/0x%x", p2i(pc), narrowOop);

  } else {

    NativeMovConstReg* move = nativeMovConstReg_at(pc);

    void* reference = record_metadata_reference(_instructions, pc, constant, CHECK);

    move->set_data((intptr_t) reference);

    TRACE_jvmci_3("relocating (metaspace constant) at " PTR_FORMAT "/" PTR_FORMAT, p2i(pc), p2i(reference));

  }

}

void CodeInstaller::pd_patch_DataSectionReference(int pc_offset, int data_offset, TRAPS) {

  address pc = _instructions->start() + pc_offset;

  NativeInstruction* inst = nativeInstruction_at(pc);

  if (inst->is_adr_aligned() || inst->is_ldr_literal()) {

    address dest = _constants->start() + data_offset;

    _instructions->relocate(pc, section_word_Relocation::spec((address) dest, CodeBuffer::SECT_CONSTS));

    TRACE_jvmci_3("relocating at " PTR_FORMAT " (+%d) with destination at %d", p2i(pc), pc_offset, data_offset);

  } else {

    JVMCI_ERROR("unknown load or move instruction at " PTR_FORMAT, p2i(pc));

  }

}

void CodeInstaller::pd_relocate_ForeignCall(NativeInstruction* inst, jlong foreign_call_destination, TRAPS) {

  address pc = (address) inst;

  if (inst->is_call()) {

    NativeCall* call = nativeCall_at(pc);

    call->set_destination((address) foreign_call_destination);

    _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec());

  } else if (inst->is_jump()) {

    NativeJump* jump = nativeJump_at(pc);

    jump->set_jump_destination((address) foreign_call_destination);

    _instructions->relocate(jump->instruction_address(), runtime_call_Relocation::spec());

  } else if (inst->is_general_jump()) {

    NativeGeneralJump* jump = nativeGeneralJump_at(pc);

    jump->set_jump_destination((address) foreign_call_destination);

    _instructions->relocate(jump->instruction_address(), runtime_call_Relocation::spec());

  } else {

    JVMCI_ERROR("unknown call or jump instruction at " PTR_FORMAT, p2i(pc));

  }

  TRACE_jvmci_3("relocating (foreign call) at " PTR_FORMAT, p2i(inst));

}

void CodeInstaller::pd_relocate_JavaMethod(CodeBuffer &cbuf, Handle hotspot_method, jint pc_offset, TRAPS) {

#ifdef ASSERT

  Method* method = NULL;

  // we need to check, this might also be an unresolved method

  if (hotspot_method->is_a(HotSpotResolvedJavaMethodImpl::klass())) {

    method = getMethodFromHotSpotMethod(hotspot_method());

  }

#endif

  switch (_next_call_type) {

    case INLINE_INVOKE:

      break;

    case INVOKEVIRTUAL:

    case INVOKEINTERFACE: {

      assert(method == NULL || !method->is_static(), "cannot call static method with invokeinterface");

      NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);

      _instructions->relocate(call->instruction_address(), virtual_call_Relocation::spec(_invoke_mark_pc));

      call->trampoline_jump(cbuf, SharedRuntime::get_resolve_virtual_call_stub());

      break;

    }

    case INVOKESTATIC: {

      assert(method == NULL || method->is_static(), "cannot call non-static method with invokestatic");

      NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);

      _instructions->relocate(call->instruction_address(), relocInfo::static_call_type);

      call->trampoline_jump(cbuf, SharedRuntime::get_resolve_static_call_stub());

      break;

    }

    case INVOKESPECIAL: {

      assert(method == NULL || !method->is_static(), "cannot call static method with invokespecial");

      NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);

      _instructions->relocate(call->instruction_address(), relocInfo::opt_virtual_call_type);

      call->trampoline_jump(cbuf, SharedRuntime::get_resolve_opt_virtual_call_stub());

      break;

    }

    default:

      JVMCI_ERROR("invalid _next_call_type value");

      break;

  }

}

void CodeInstaller::pd_relocate_poll(address pc, jint mark, TRAPS) {

  switch (mark) {

    case POLL_NEAR:

      JVMCI_ERROR("unimplemented");

      break;

    case POLL_FAR:

      _instructions->relocate(pc, relocInfo::poll_type);

      break;

    case POLL_RETURN_NEAR:

      JVMCI_ERROR("unimplemented");

      break;

    case POLL_RETURN_FAR:

      _instructions->relocate(pc, relocInfo::poll_return_type);

      break;

    default:

      JVMCI_ERROR("invalid mark value");

      break;

  }

}

// convert JVMCI register indices (as used in oop maps) to HotSpot registers

VMReg CodeInstaller::get_hotspot_reg(jint jvmci_reg, TRAPS) {

  if (jvmci_reg < RegisterImpl::number_of_registers) {

    return as_Register(jvmci_reg)->as_VMReg();

  } else {

    jint floatRegisterNumber = jvmci_reg - RegisterImpl::number_of_registers_for_jvmci;

    if (floatRegisterNumber >= 0 && floatRegisterNumber < FloatRegisterImpl::number_of_registers) {

      return as_FloatRegister(floatRegisterNumber)->as_VMReg();

    }

    JVMCI_ERROR_NULL("invalid register number: %d", jvmci_reg);

  }

}

bool CodeInstaller::is_general_purpose_reg(VMReg hotspotRegister) {

  return !hotspotRegister->is_FloatRegister();

}