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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <set>
#include "src/objects-inl.h"
#include "src/v8.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
namespace {
void AddSigned(std::set<Smi*>& smis, int64_t x) {
if (!Smi::IsValid(x)) return;
smis.insert(Smi::FromInt(static_cast<int>(x)));
smis.insert(Smi::FromInt(static_cast<int>(-x)));
}
// Uses std::lexicographical_compare twice to convert the result to -1, 0 or 1.
int ExpectedCompareResult(Smi* a, Smi* b) {
std::string str_a = std::to_string(a->value());
std::string str_b = std::to_string(b->value());
bool expected_a_lt_b = std::lexicographical_compare(
str_a.begin(), str_a.end(), str_b.begin(), str_b.end());
bool expected_b_lt_a = std::lexicographical_compare(
str_b.begin(), str_b.end(), str_a.begin(), str_a.end());
if (!expected_a_lt_b && !expected_b_lt_a) {
return 0;
} else if (expected_a_lt_b) {
return -1;
} else {
CHECK(expected_b_lt_a);
return 1;
}
}
bool Test(Isolate* isolate, Smi* a, Smi* b) {
int actual = Smi::LexicographicCompare(isolate, a, b)->value();
int expected = ExpectedCompareResult(a, b);
return actual == expected;
}
} // namespace
TEST(TestSmiLexicographicCompare) {
Isolate* isolate = CcTest::InitIsolateOnce();
HandleScope scope(isolate);
std::set<Smi*> smis;
for (int64_t xb = 1; xb <= Smi::kMaxValue; xb *= 10) {
for (int64_t xf = 0; xf <= 9; ++xf) {
for (int64_t xo = -1; xo <= 1; ++xo) {
AddSigned(smis, xb * xf + xo);
}
}
}
for (int64_t yb = 1; yb <= Smi::kMaxValue; yb *= 2) {
for (int64_t yo = -2; yo <= 2; ++yo) {
AddSigned(smis, yb + yo);
}
}
for (Smi* a : smis) {
for (Smi* b : smis) {
CHECK(Test(isolate, a, b));
}
}
}
} // namespace internal
} // namespace v8
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