// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
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//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <stdlib.h>

#include "src/v8.h"
#include "test/cctest/cctest.h"

#include "src/macro-assembler.h"
#include "src/mips64/macro-assembler-mips64.h"
#include "src/mips64/simulator-mips64.h"


using namespace v8::internal;

typedef void* (*F)(int64_t x, int64_t y, int p2, int p3, int p4);

#define __ masm->


static byte to_non_zero(int n) {
  return static_cast<unsigned>(n) % 255 + 1;
}


static bool all_zeroes(const byte* beg, const byte* end) {
  CHECK(beg);
  CHECK(beg <= end);
  while (beg < end) {
    if (*beg++ != 0)
      return false;
  }
  return true;
}


TEST(CopyBytes) {
  CcTest::InitializeVM();
  Isolate* isolate = Isolate::Current();
  HandleScope handles(isolate);

  const int data_size = 1 * KB;
  size_t act_size;

  // Allocate two blocks to copy data between.
  byte* src_buffer =
      static_cast<byte*>(v8::base::OS::Allocate(data_size, &act_size, 0));
  CHECK(src_buffer);
  CHECK(act_size >= static_cast<size_t>(data_size));
  byte* dest_buffer =
      static_cast<byte*>(v8::base::OS::Allocate(data_size, &act_size, 0));
  CHECK(dest_buffer);
  CHECK(act_size >= static_cast<size_t>(data_size));

  // Storage for a0 and a1.
  byte* a0_;
  byte* a1_;

  MacroAssembler assembler(isolate, NULL, 0);
  MacroAssembler* masm = &assembler;

  // Code to be generated: The stuff in CopyBytes followed by a store of a0 and
  // a1, respectively.
  __ CopyBytes(a0, a1, a2, a3);
  __ li(a2, Operand(reinterpret_cast<int64_t>(&a0_)));
  __ li(a3, Operand(reinterpret_cast<int64_t>(&a1_)));
  __ sd(a0, MemOperand(a2));
  __ jr(ra);
  __ sd(a1, MemOperand(a3));

  CodeDesc desc;
  masm->GetCode(&desc);
  Handle<Code> code = isolate->factory()->NewCode(
      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());

  ::F f = FUNCTION_CAST< ::F>(code->entry());

  // Initialise source data with non-zero bytes.
  for (int i = 0; i < data_size; i++) {
    src_buffer[i] = to_non_zero(i);
  }

  const int fuzz = 11;

  for (int size = 0; size < 600; size++) {
    for (const byte* src = src_buffer; src < src_buffer + fuzz; src++) {
      for (byte* dest = dest_buffer; dest < dest_buffer + fuzz; dest++) {
        memset(dest_buffer, 0, data_size);
        CHECK(dest + size < dest_buffer + data_size);
        (void) CALL_GENERATED_CODE(f, reinterpret_cast<int64_t>(src),
                                      reinterpret_cast<int64_t>(dest),
                                      size, 0, 0);
        // a0 and a1 should point at the first byte after the copied data.
        CHECK_EQ(src + size, a0_);
        CHECK_EQ(dest + size, a1_);
        // Check that we haven't written outside the target area.
        CHECK(all_zeroes(dest_buffer, dest));
        CHECK(all_zeroes(dest + size, dest_buffer + data_size));
        // Check the target area.
        CHECK_EQ(0, memcmp(src, dest, size));
      }
    }
  }

  // Check that the source data hasn't been clobbered.
  for (int i = 0; i < data_size; i++) {
    CHECK(src_buffer[i] == to_non_zero(i));
  }
}


TEST(LoadConstants) {
  CcTest::InitializeVM();
  Isolate* isolate = Isolate::Current();
  HandleScope handles(isolate);

  int64_t refConstants[64];
  int64_t result[64];

  int64_t mask = 1;
  for (int i = 0; i < 64; i++) {
    refConstants[i] = ~(mask << i);
  }

  MacroAssembler assembler(isolate, NULL, 0);
  MacroAssembler* masm = &assembler;

  __ mov(a4, a0);
  for (int i = 0; i < 64; i++) {
    // Load constant.
    __ li(a5, Operand(refConstants[i]));
    __ sd(a5, MemOperand(a4));
    __ Daddu(a4, a4, Operand(kPointerSize));
  }

  __ jr(ra);
  __ nop();

  CodeDesc desc;
  masm->GetCode(&desc);
  Handle<Code> code = isolate->factory()->NewCode(
      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());

  ::F f = FUNCTION_CAST< ::F>(code->entry());
     (void) CALL_GENERATED_CODE(f, reinterpret_cast<int64_t>(result),
                                0, 0, 0, 0);
  // Check results.
  for (int i = 0; i < 64; i++) {
    CHECK(refConstants[i] == result[i]);
  }
}


TEST(LoadAddress) {
  CcTest::InitializeVM();
  Isolate* isolate = Isolate::Current();
  HandleScope handles(isolate);

  MacroAssembler assembler(isolate, NULL, 0);
  MacroAssembler* masm = &assembler;
  Label to_jump, skip;
  __ mov(a4, a0);

  __ Branch(&skip);
  __ bind(&to_jump);
  __ nop();
  __ nop();
  __ jr(ra);
  __ nop();
  __ bind(&skip);
  __ li(a4, Operand(masm->jump_address(&to_jump)), ADDRESS_LOAD);
  int check_size = masm->InstructionsGeneratedSince(&skip);
  CHECK_EQ(check_size, 4);
  __ jr(a4);
  __ nop();
  __ stop("invalid");
  __ stop("invalid");
  __ stop("invalid");
  __ stop("invalid");
  __ stop("invalid");


  CodeDesc desc;
  masm->GetCode(&desc);
  Handle<Code> code = isolate->factory()->NewCode(
      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());

  ::F f = FUNCTION_CAST< ::F>(code->entry());
     (void) CALL_GENERATED_CODE(f, 0, 0, 0, 0, 0);
  // Check results.
}

#undef __