/*
 * Copyright (c) 2013, 2014, 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 "compiler/disassembler.hpp"
#include "runtime/javaCalls.hpp"
#include "graal/graalEnv.hpp"
#include "graal/graalCompiler.hpp"
#include "graal/graalCodeInstaller.hpp"
#include "graal/graalJavaAccess.hpp"
#include "graal/graalCompilerToVM.hpp"
#include "graal/graalRuntime.hpp"
#include "asm/register.hpp"
#include "classfile/vmSymbols.hpp"
#include "code/vmreg.hpp"

jint CodeInstaller::pd_next_offset(NativeInstruction* inst, jint pc_offset, oop method) {
  if (inst->is_call() || inst->is_jump()) {
    assert(NativeCall::instruction_size == (int)NativeJump::instruction_size, "unexpected size");
    return (pc_offset + NativeCall::instruction_size);
  } else if (inst->is_mov_literal64()) {
    // mov+call instruction pair
    jint offset = pc_offset + NativeMovConstReg::instruction_size;
    u_char* call = (u_char*) (_instructions->start() + offset);
    assert((call[0] == 0x40 || call[0] == 0x41) && call[1] == 0xFF, "expected call with rex/rexb prefix byte");
    offset += 3; /* prefix byte + opcode byte + modrm byte */
    return (offset);
  } else if (inst->is_call_reg()) {
    // the inlined vtable stub contains a "call register" instruction
    assert(method != NULL, "only valid for virtual calls");
    return (pc_offset + ((NativeCallReg *) inst)->next_instruction_offset());
  } else if (inst->is_cond_jump()) {
    address pc = (address) (inst);
    return pc_offset + (jint) (Assembler::locate_next_instruction(pc) - pc);
  } else {
    fatal("unsupported type of instruction for call site");
    return 0;
  }
}

void CodeInstaller::pd_patch_OopData(int pc_offset, oop data) {
  address pc = _instructions->start() + pc_offset;
  Handle obj = OopData::object(data);
  jobject value = JNIHandles::make_local(obj());
  if (OopData::compressed(data)) {
    address operand = Assembler::locate_operand(pc, Assembler::narrow_oop_operand);
    int oop_index = _oop_recorder->find_index(value);
    _instructions->relocate(pc, oop_Relocation::spec(oop_index), Assembler::narrow_oop_operand);
    TRACE_graal_3("relocating (narrow oop constant) at %p/%p", pc, operand);
  } else {
    address operand = Assembler::locate_operand(pc, Assembler::imm_operand);
    *((jobject*) operand) = value;
    _instructions->relocate(pc, oop_Relocation::spec_for_immediate(), Assembler::imm_operand);
    TRACE_graal_3("relocating (oop constant) at %p/%p", pc, operand);
  }
}

void CodeInstaller::pd_patch_DataSectionReference(int pc_offset, oop data) {
  address pc = _instructions->start() + pc_offset;
  jint offset = DataSectionReference::offset(data);

  address operand = Assembler::locate_operand(pc, Assembler::disp32_operand);
  address next_instruction = Assembler::locate_next_instruction(pc);
  address dest = _constants->start() + offset;

  long disp = dest - next_instruction;
  assert(disp == (jint) disp, "disp doesn't fit in 32 bits");
  *((jint*) operand) = (jint) disp;

  _instructions->relocate(pc, section_word_Relocation::spec((address) dest, CodeBuffer::SECT_CONSTS), Assembler::disp32_operand);
  TRACE_graal_3("relocating at %p/%p with destination at %p (%d)", pc, operand, dest, offset);
}

void CodeInstaller::pd_relocate_CodeBlob(CodeBlob* cb, NativeInstruction* inst) {
  if (cb->is_nmethod()) {
    nmethod* nm = (nmethod*) cb;
    nativeJump_at((address)inst)->set_jump_destination(nm->verified_entry_point());
  } else {
    nativeJump_at((address)inst)->set_jump_destination(cb->code_begin());
  }
  _instructions->relocate((address)inst, runtime_call_Relocation::spec(), Assembler::call32_operand);
}

void CodeInstaller::pd_relocate_ForeignCall(NativeInstruction* inst, jlong foreign_call_destination) {
  address pc = (address) inst;
  if (inst->is_call()) {
    // NOTE: for call without a mov, the offset must fit a 32-bit immediate
    //       see also CompilerToVM.getMaxCallTargetOffset()
    NativeCall* call = nativeCall_at(pc);
    call->set_destination((address) foreign_call_destination);
    _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand);
  } else if (inst->is_mov_literal64()) {
    NativeMovConstReg* mov = nativeMovConstReg_at(pc);
    mov->set_data((intptr_t) foreign_call_destination);
    _instructions->relocate(mov->instruction_address(), runtime_call_Relocation::spec(), Assembler::imm_operand);
  } 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(), Assembler::call32_operand);
  } else if (inst->is_cond_jump()) {
    address old_dest = nativeGeneralJump_at(pc)->jump_destination();
    address disp = Assembler::locate_operand(pc, Assembler::call32_operand);
    *(jint*) disp += ((address) foreign_call_destination) - old_dest;
    _instructions->relocate(pc, runtime_call_Relocation::spec(), Assembler::call32_operand);
  } else {
    fatal("unsupported relocation for foreign call");
  }

  TRACE_graal_3("relocating (foreign call)  at %p", inst);
}

void CodeInstaller::pd_relocate_JavaMethod(oop hotspot_method, jint pc_offset) {
#ifdef ASSERT
  Method* method = NULL;
  // we need to check, this might also be an unresolved method
  if (hotspot_method->is_a(HotSpotResolvedJavaMethod::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);
      call->set_destination(SharedRuntime::get_resolve_virtual_call_stub());
      _instructions->relocate(call->instruction_address(),
                                             virtual_call_Relocation::spec(_invoke_mark_pc),
                                             Assembler::call32_operand);
      break;
    }
    case INVOKESTATIC: {
      assert(method == NULL || method->is_static(), "cannot call non-static method with invokestatic");

      NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);
      call->set_destination(SharedRuntime::get_resolve_static_call_stub());
      _instructions->relocate(call->instruction_address(),
                                             relocInfo::static_call_type, Assembler::call32_operand);
      break;
    }
    case INVOKESPECIAL: {
      assert(method == NULL || !method->is_static(), "cannot call static method with invokespecial");
      NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);
      call->set_destination(SharedRuntime::get_resolve_opt_virtual_call_stub());
      _instructions->relocate(call->instruction_address(),
                              relocInfo::opt_virtual_call_type, Assembler::call32_operand);
      break;
    }
    default:
      break;
  }
}

static void relocate_poll_near(address pc) {
  NativeInstruction* ni = nativeInstruction_at(pc);
  int32_t* disp = (int32_t*) Assembler::locate_operand(pc, Assembler::disp32_operand);
  int32_t offset = *disp; // The Java code installed the polling page offset into the disp32 operand
  intptr_t new_disp = (intptr_t) (os::get_polling_page() + offset) - (intptr_t) ni;
  *disp = (int32_t)new_disp;
}


void CodeInstaller::pd_relocate_poll(address pc, jint mark) {
  switch (mark) {
    case POLL_NEAR: {
      relocate_poll_near(pc);
      _instructions->relocate(pc, relocInfo::poll_type, Assembler::disp32_operand);
      break;
    }
    case POLL_FAR:
      // This is a load from a register so there is no relocatable operand.
      // We just have to ensure that the format is not disp32_operand
      // so that poll_Relocation::fix_relocation_after_move does the right
      // thing (i.e. ignores this relocation record)
      _instructions->relocate(pc, relocInfo::poll_type, Assembler::imm_operand);
      break;
    case POLL_RETURN_NEAR: {
      relocate_poll_near(pc);
      _instructions->relocate(pc, relocInfo::poll_return_type, Assembler::disp32_operand);
      break;
    }
    case POLL_RETURN_FAR:
      // see comment above for POLL_FAR
      _instructions->relocate(pc, relocInfo::poll_return_type, Assembler::imm_operand);
      break;
    default:
      fatal("invalid mark value");
      break;
  }
}