// Copyright 2013 the V8 project authors. All rights reserved.
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//
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#include <stdlib.h>

#include "src/assembler-inl.h"
#include "src/base/platform/platform.h"
#include "src/code-stubs.h"
#include "src/factory.h"
#include "src/macro-assembler.h"
#include "src/objects-inl.h"
#include "src/simulator.h"
#include "src/v8.h"
#include "test/cctest/cctest.h"
#include "test/cctest/test-code-stubs.h"

namespace v8 {
namespace internal {

#define __ masm.

ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                              Register source_reg,
                                              Register destination_reg,
                                              bool inline_fastpath) {
  // Allocate an executable page of memory.
  size_t actual_size;
  byte* buffer = static_cast<byte*>(v8::base::OS::Allocate(
      Assembler::kMinimalBufferSize, &actual_size, true));
  CHECK(buffer);
  HandleScope handles(isolate);
  MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
                      v8::internal::CodeObjectRequired::kYes);
  DoubleToIStub stub(isolate, source_reg, destination_reg, 0, true,
                     inline_fastpath);

  byte* start = stub.GetCode()->instruction_start();
  Label done;

  // Save callee save registers.
  __ Push(r7, r6, r5, r4);
  __ Push(lr);

  // For softfp, move the input value into d0.
  if (!masm.use_eabi_hardfloat()) {
    __ vmov(d0, r0, r1);
  }
  // Push the double argument.
  __ sub(sp, sp, Operand(kDoubleSize));
  __ vstr(d0, sp, 0);
  if (source_reg != sp) {
    __ mov(source_reg, sp);
  }

  // Save registers make sure they don't get clobbered.
  int source_reg_offset = kDoubleSize;
  int reg_num = 0;
  for (; reg_num < Register::kNumRegisters; ++reg_num) {
    if (RegisterConfiguration::Default()->IsAllocatableGeneralCode(reg_num)) {
      Register reg = Register::from_code(reg_num);
      if (reg != destination_reg) {
        __ push(reg);
        source_reg_offset += kPointerSize;
      }
    }
  }

  // Re-push the double argument.
  __ sub(sp, sp, Operand(kDoubleSize));
  __ vstr(d0, sp, 0);

  // Call through to the actual stub
  if (inline_fastpath) {
    __ vldr(d0, MemOperand(source_reg));
    __ TryInlineTruncateDoubleToI(destination_reg, d0, &done);
    if (destination_reg == source_reg && source_reg != sp) {
      // Restore clobbered source_reg.
      __ add(source_reg, sp, Operand(source_reg_offset));
    }
  }
  __ Call(start, RelocInfo::EXTERNAL_REFERENCE);
  __ bind(&done);

  __ add(sp, sp, Operand(kDoubleSize));

  // Make sure no registers have been unexpectedly clobbered
  for (--reg_num; reg_num >= 0; --reg_num) {
    if (RegisterConfiguration::Default()->IsAllocatableGeneralCode(reg_num)) {
      Register reg = Register::from_code(reg_num);
      if (reg != destination_reg) {
        __ ldr(ip, MemOperand(sp, 0));
        __ cmp(reg, ip);
        __ Assert(eq, kRegisterWasClobbered);
        __ add(sp, sp, Operand(kPointerSize));
      }
    }
  }

  __ add(sp, sp, Operand(kDoubleSize));

  if (destination_reg != r0) __ mov(r0, destination_reg);

  // Restore callee save registers.
  __ Pop(lr);
  __ Pop(r7, r6, r5, r4);

  __ Ret(0);

  CodeDesc desc;
  masm.GetCode(isolate, &desc);
  Assembler::FlushICache(isolate, buffer, actual_size);
  return (reinterpret_cast<ConvertDToIFunc>(
      reinterpret_cast<intptr_t>(buffer)));
}

#undef __


static Isolate* GetIsolateFrom(LocalContext* context) {
  return reinterpret_cast<Isolate*>((*context)->GetIsolate());
}


int32_t RunGeneratedCodeCallWrapper(ConvertDToIFunc func,
                                    double from) {
#ifdef USE_SIMULATOR
  return CALL_GENERATED_FP_INT(CcTest::i_isolate(), func, from, 0);
#else
  return (*func)(from);
#endif
}


TEST(ConvertDToI) {
  CcTest::InitializeVM();
  LocalContext context;
  Isolate* isolate = GetIsolateFrom(&context);
  HandleScope scope(isolate);

#if DEBUG
  // Verify that the tests actually work with the C version. In the release
  // code, the compiler optimizes it away because it's all constant, but does it
  // wrong, triggering an assert on gcc.
  RunAllTruncationTests(&ConvertDToICVersion);
#endif

  Register source_registers[] = {sp, r0, r1, r2, r3, r4, r5, r6, r7};
  Register dest_registers[] = {r0, r1, r2, r3, r4, r5, r6, r7};

  for (size_t s = 0; s < sizeof(source_registers) / sizeof(Register); s++) {
    for (size_t d = 0; d < sizeof(dest_registers) / sizeof(Register); d++) {
      RunAllTruncationTests(
          RunGeneratedCodeCallWrapper,
          MakeConvertDToIFuncTrampoline(isolate,
                                        source_registers[s],
                                        dest_registers[d],
                                        false));
      RunAllTruncationTests(
          RunGeneratedCodeCallWrapper,
          MakeConvertDToIFuncTrampoline(isolate,
                                        source_registers[s],
                                        dest_registers[d],
                                        true));
    }
  }
}

}  // namespace internal
}  // namespace v8