test/cctest/test-utils.cc

// Copyright 2006-2008 the V8 project authors. All rights reserved.
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#include <stdlib.h>

#include "v8.h"

#include "platform.h"
#include "cctest.h"

using namespace v8::internal;


TEST(Utils1) {
  CHECK_EQ(-1000000, FastD2I(-1000000.0));
  CHECK_EQ(-1, FastD2I(-1.0));
  CHECK_EQ(0, FastD2I(0.0));
  CHECK_EQ(1, FastD2I(1.0));
  CHECK_EQ(1000000, FastD2I(1000000.0));

  CHECK_EQ(-1000000, FastD2I(-1000000.123));
  CHECK_EQ(-1, FastD2I(-1.234));
  CHECK_EQ(0, FastD2I(0.345));
  CHECK_EQ(1, FastD2I(1.234));
  CHECK_EQ(1000000, FastD2I(1000000.123));
  // Check that >> is implemented as arithmetic shift right.
  // If this is not true, then ArithmeticShiftRight() must be changed,
  // There are also documented right shifts in assembler.cc of
  // int8_t and intptr_t signed integers.
  CHECK_EQ(-2, -8 >> 2);
  CHECK_EQ(-2, static_cast<int8_t>(-8) >> 2);
  CHECK_EQ(-2, static_cast<int>(static_cast<intptr_t>(-8) >> 2));
}


TEST(SNPrintF) {
  // Make sure that strings that are truncated because of too small
  // buffers are zero-terminated anyway.
  const char* s = "the quick lazy .... oh forget it!";
  int length = StrLength(s);
  for (int i = 1; i < length * 2; i++) {
    static const char kMarker = static_cast<char>(42);
    Vector<char> buffer = Vector<char>::New(i + 1);
    buffer[i] = kMarker;
    int n = OS::SNPrintF(Vector<char>(buffer.start(), i), "%s", s);
    CHECK(n <= i);
    CHECK(n == length || n == -1);
    CHECK_EQ(0, strncmp(buffer.start(), s, i - 1));
    CHECK_EQ(kMarker, buffer[i]);
    if (i <= length) {
      CHECK_EQ(i - 1, StrLength(buffer.start()));
    } else {
      CHECK_EQ(length, StrLength(buffer.start()));
    }
    buffer.Dispose();
  }
}