v8/test/cctest/test-code-stubs-x87.cc

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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#include <stdlib.h>

#include <limits>

#include "v8.h"

#include "cctest.h"
#include "code-stubs.h"
#include "test-code-stubs.h"
#include "factory.h"
#include "macro-assembler.h"
#include "platform.h"

using namespace v8::internal;

#define __ assm.

ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                              Register source_reg,
                                              Register destination_reg) {
  // Allocate an executable page of memory.
  size_t actual_size;
  byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
                                                   &actual_size,
                                                   true));
  CHECK(buffer);
  HandleScope handles(isolate);
  MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size));
  int offset =
    source_reg.is(esp) ? 0 : (HeapNumber::kValueOffset - kSmiTagSize);
  DoubleToIStub stub(isolate, source_reg, destination_reg, offset, true);
  byte* start = stub.GetCode()->instruction_start();

  __ push(ebx);
  __ push(ecx);
  __ push(edx);
  __ push(esi);
  __ push(edi);

  if (!source_reg.is(esp)) {
    __ lea(source_reg, MemOperand(esp, 6 * kPointerSize - offset));
  }

  int param_offset = 7 * kPointerSize;
  // Save registers make sure they don't get clobbered.
  int reg_num = 0;
  for (;reg_num < Register::NumAllocatableRegisters(); ++reg_num) {
    Register reg = Register::FromAllocationIndex(reg_num);
    if (!reg.is(esp) && !reg.is(ebp) && !reg.is(destination_reg)) {
      __ push(reg);
      param_offset += kPointerSize;
    }
  }

  // Re-push the double argument
  __ push(MemOperand(esp, param_offset));
  __ push(MemOperand(esp, param_offset));

  // Call through to the actual stub
  __ call(start, RelocInfo::EXTERNAL_REFERENCE);

  __ add(esp, Immediate(kDoubleSize));

  // Make sure no registers have been unexpectedly clobbered
  for (--reg_num; reg_num >= 0; --reg_num) {
    Register reg = Register::FromAllocationIndex(reg_num);
    if (!reg.is(esp) && !reg.is(ebp) && !reg.is(destination_reg)) {
      __ cmp(reg, MemOperand(esp, 0));
      __ Assert(equal, kRegisterWasClobbered);
      __ add(esp, Immediate(kPointerSize));
    }
  }

  __ mov(eax, destination_reg);

  __ pop(edi);
  __ pop(esi);
  __ pop(edx);
  __ pop(ecx);
  __ pop(ebx);

  __ ret(kDoubleSize);

  CodeDesc desc;
  assm.GetCode(&desc);
  return reinterpret_cast<ConvertDToIFunc>(
      reinterpret_cast<intptr_t>(buffer));
}

#undef __


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


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[] = {esp, eax, ebx, ecx, edx, edi, esi};
  Register dest_registers[] = {eax, ebx, ecx, edx, edi, esi};

  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(
          MakeConvertDToIFuncTrampoline(isolate,
                                        source_registers[s],
                                        dest_registers[d]));
    }
  }
}