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llvm-mirror/unittests/ADT/APSIntTest.cpp
Raphael Isemann 3637aff1ea ADT: Fix that APSInt's string constructor claims it requires 5 bits to store a zero 
Summary:

When constructing an APSInt from a string, the constructor doesn't correctly
truncate the bit width of the result if the passed in string was "0" (or any
alternative way to express 0 like "-0" or "000"). Instead of 1 (which is the
smallest allowed bit width) it returns an APSInt with a bit width of 5.

The reason is that the constructor checks that it never truncates the result to
the invalid bit width of 0, so when it calculates that storing a "0" doesn't
require any bits it just keeps the original overestimated bit width (which
happens to be 5).

This patch just sets the bit width of the result to 1 if the required bit width
is 0.

Reviewers: arphaman, dexonsmith

Reviewed By: dexonsmith

Subscribers: hiraditya, dexonsmith, JDevlieghere, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D81329
2020-06-10 16:36:33 +02:00

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//===- llvm/unittest/ADT/APSIntTest.cpp - APSInt unit tests ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/APSInt.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
TEST(APSIntTest, MoveTest) {
APSInt A(32, true);
EXPECT_TRUE(A.isUnsigned());
APSInt B(128, false);
A = B;
EXPECT_FALSE(A.isUnsigned());
APSInt C(B);
EXPECT_FALSE(C.isUnsigned());
APInt Wide(256, 0);
const uint64_t *Bits = Wide.getRawData();
APSInt D(std::move(Wide));
EXPECT_TRUE(D.isUnsigned());
EXPECT_EQ(Bits, D.getRawData()); // Verify that "Wide" was really moved.
A = APSInt(64, true);
EXPECT_TRUE(A.isUnsigned());
Wide = APInt(128, 1);
Bits = Wide.getRawData();
A = std::move(Wide);
EXPECT_TRUE(A.isUnsigned());
EXPECT_EQ(Bits, A.getRawData()); // Verify that "Wide" was really moved.
}
TEST(APSIntTest, get) {
EXPECT_TRUE(APSInt::get(7).isSigned());
EXPECT_EQ(64u, APSInt::get(7).getBitWidth());
EXPECT_EQ(7u, APSInt::get(7).getZExtValue());
EXPECT_EQ(7, APSInt::get(7).getSExtValue());
EXPECT_TRUE(APSInt::get(-7).isSigned());
EXPECT_EQ(64u, APSInt::get(-7).getBitWidth());
EXPECT_EQ(-7, APSInt::get(-7).getSExtValue());
EXPECT_EQ(UINT64_C(0) - 7, APSInt::get(-7).getZExtValue());
}
TEST(APSIntTest, getUnsigned) {
EXPECT_TRUE(APSInt::getUnsigned(7).isUnsigned());
EXPECT_EQ(64u, APSInt::getUnsigned(7).getBitWidth());
EXPECT_EQ(7u, APSInt::getUnsigned(7).getZExtValue());
EXPECT_EQ(7, APSInt::getUnsigned(7).getSExtValue());
EXPECT_TRUE(APSInt::getUnsigned(-7).isUnsigned());
EXPECT_EQ(64u, APSInt::getUnsigned(-7).getBitWidth());
EXPECT_EQ(-7, APSInt::getUnsigned(-7).getSExtValue());
EXPECT_EQ(UINT64_C(0) - 7, APSInt::getUnsigned(-7).getZExtValue());
}
TEST(APSIntTest, getExtValue) {
EXPECT_TRUE(APSInt(APInt(3, 7), true).isUnsigned());
EXPECT_TRUE(APSInt(APInt(3, 7), false).isSigned());
EXPECT_TRUE(APSInt(APInt(4, 7), true).isUnsigned());
EXPECT_TRUE(APSInt(APInt(4, 7), false).isSigned());
EXPECT_TRUE(APSInt(APInt(4, -7), true).isUnsigned());
EXPECT_TRUE(APSInt(APInt(4, -7), false).isSigned());
EXPECT_EQ(7, APSInt(APInt(3, 7), true).getExtValue());
EXPECT_EQ(-1, APSInt(APInt(3, 7), false).getExtValue());
EXPECT_EQ(7, APSInt(APInt(4, 7), true).getExtValue());
EXPECT_EQ(7, APSInt(APInt(4, 7), false).getExtValue());
EXPECT_EQ(9, APSInt(APInt(4, -7), true).getExtValue());
EXPECT_EQ(-7, APSInt(APInt(4, -7), false).getExtValue());
}
TEST(APSIntTest, compareValues) {
auto U = [](uint64_t V) { return APSInt::getUnsigned(V); };
auto S = [](int64_t V) { return APSInt::get(V); };
// Bit-width matches and is-signed.
EXPECT_TRUE(APSInt::compareValues(S(7), S(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(8), S(7)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(7), S(7)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(8), S(-7)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(-7)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(-8)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(-8), S(-7)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(-7)) == 0);
// Bit-width matches and not is-signed.
EXPECT_TRUE(APSInt::compareValues(U(7), U(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(U(8), U(7)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7), U(7)) == 0);
// Bit-width matches and mixed signs.
EXPECT_TRUE(APSInt::compareValues(U(7), S(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(U(8), S(7)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7), S(7)) == 0);
EXPECT_TRUE(APSInt::compareValues(U(8), S(-7)) > 0);
// Bit-width mismatch and is-signed.
EXPECT_TRUE(APSInt::compareValues(S(7).trunc(32), S(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(8).trunc(32), S(7)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(7).trunc(32), S(7)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(-7).trunc(32), S(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(8).trunc(32), S(-7)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(-7).trunc(32), S(-7)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(-7).trunc(32), S(-8)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(-8).trunc(32), S(-7)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(-7).trunc(32), S(-7)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(7), S(8).trunc(32)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(8), S(7).trunc(32)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(7), S(7).trunc(32)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(8).trunc(32)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(8), S(-7).trunc(32)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(-7).trunc(32)) == 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(-8).trunc(32)) > 0);
EXPECT_TRUE(APSInt::compareValues(S(-8), S(-7).trunc(32)) < 0);
EXPECT_TRUE(APSInt::compareValues(S(-7), S(-7).trunc(32)) == 0);
// Bit-width mismatch and not is-signed.
EXPECT_TRUE(APSInt::compareValues(U(7), U(8).trunc(32)) < 0);
EXPECT_TRUE(APSInt::compareValues(U(8), U(7).trunc(32)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7), U(7).trunc(32)) == 0);
EXPECT_TRUE(APSInt::compareValues(U(7).trunc(32), U(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(U(8).trunc(32), U(7)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7).trunc(32), U(7)) == 0);
// Bit-width mismatch and mixed signs.
EXPECT_TRUE(APSInt::compareValues(U(7).trunc(32), S(8)) < 0);
EXPECT_TRUE(APSInt::compareValues(U(8).trunc(32), S(7)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7).trunc(32), S(7)) == 0);
EXPECT_TRUE(APSInt::compareValues(U(8).trunc(32), S(-7)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7), S(8).trunc(32)) < 0);
EXPECT_TRUE(APSInt::compareValues(U(8), S(7).trunc(32)) > 0);
EXPECT_TRUE(APSInt::compareValues(U(7), S(7).trunc(32)) == 0);
EXPECT_TRUE(APSInt::compareValues(U(8), S(-7).trunc(32)) > 0);
}
TEST(APSIntTest, FromString) {
EXPECT_EQ(APSInt("1").getExtValue(), 1);
EXPECT_EQ(APSInt("-1").getExtValue(), -1);
EXPECT_EQ(APSInt("0").getExtValue(), 0);
EXPECT_EQ(APSInt("56789").getExtValue(), 56789);
EXPECT_EQ(APSInt("-1234").getExtValue(), -1234);
}
TEST(APSIntTest, FromStringBitWidth) {
EXPECT_EQ(APSInt("0").getBitWidth(), 1U);
EXPECT_EQ(APSInt("000").getBitWidth(), 1U);
EXPECT_EQ(APSInt("1").getBitWidth(), 1U);
EXPECT_EQ(APSInt("2").getBitWidth(), 2U);
EXPECT_EQ(APSInt("3").getBitWidth(), 2U);
EXPECT_EQ(APSInt("003").getBitWidth(), 2U);
EXPECT_EQ(APSInt("15").getBitWidth(), 4U);
EXPECT_EQ(APSInt("16").getBitWidth(), 5U);
EXPECT_EQ(APSInt("17").getBitWidth(), 5U);
EXPECT_EQ(APSInt("-0").getBitWidth(), 1U);
EXPECT_EQ(APSInt("-000").getBitWidth(), 1U);
EXPECT_EQ(APSInt("-1").getBitWidth(), 1U);
EXPECT_EQ(APSInt("-2").getBitWidth(), 2U);
EXPECT_EQ(APSInt("-3").getBitWidth(), 3U);
EXPECT_EQ(APSInt("-003").getBitWidth(), 3U);
EXPECT_EQ(APSInt("-5").getBitWidth(), 4U);
EXPECT_EQ(APSInt("-15").getBitWidth(), 5U);
EXPECT_EQ(APSInt("-16").getBitWidth(), 5U);
EXPECT_EQ(APSInt("-17").getBitWidth(), 6U);
}
#if defined(GTEST_HAS_DEATH_TEST) && !defined(NDEBUG)
TEST(APSIntTest, StringDeath) {
EXPECT_DEATH((void)APSInt(""), "Invalid string length");
EXPECT_DEATH((void)APSInt("1a"), "Invalid character in digit string");
}
#endif
TEST(APSIntTest, SignedHighBit) {
APSInt False(APInt(1, 0), false);
APSInt True(APInt(1, 1), false);
APSInt CharMin(APInt(8, 0), false);
APSInt CharSmall(APInt(8, 0x13), false);
APSInt CharBoundaryUnder(APInt(8, 0x7f), false);
APSInt CharBoundaryOver(APInt(8, 0x80), false);
APSInt CharLarge(APInt(8, 0xd9), false);
APSInt CharMax(APInt(8, 0xff), false);
EXPECT_FALSE(False.isNegative());
EXPECT_TRUE(False.isNonNegative());
EXPECT_FALSE(False.isStrictlyPositive());
EXPECT_TRUE(True.isNegative());
EXPECT_FALSE(True.isNonNegative());
EXPECT_FALSE(True.isStrictlyPositive());
EXPECT_FALSE(CharMin.isNegative());
EXPECT_TRUE(CharMin.isNonNegative());
EXPECT_FALSE(CharMin.isStrictlyPositive());
EXPECT_FALSE(CharSmall.isNegative());
EXPECT_TRUE(CharSmall.isNonNegative());
EXPECT_TRUE(CharSmall.isStrictlyPositive());
EXPECT_FALSE(CharBoundaryUnder.isNegative());
EXPECT_TRUE(CharBoundaryUnder.isNonNegative());
EXPECT_TRUE(CharBoundaryUnder.isStrictlyPositive());
EXPECT_TRUE(CharBoundaryOver.isNegative());
EXPECT_FALSE(CharBoundaryOver.isNonNegative());
EXPECT_FALSE(CharBoundaryOver.isStrictlyPositive());
EXPECT_TRUE(CharLarge.isNegative());
EXPECT_FALSE(CharLarge.isNonNegative());
EXPECT_FALSE(CharLarge.isStrictlyPositive());
EXPECT_TRUE(CharMax.isNegative());
EXPECT_FALSE(CharMax.isNonNegative());
EXPECT_FALSE(CharMax.isStrictlyPositive());
}
TEST(APSIntTest, UnsignedHighBit) {
APSInt False(APInt(1, 0));
APSInt True(APInt(1, 1));
APSInt CharMin(APInt(8, 0));
APSInt CharSmall(APInt(8, 0x13));
APSInt CharBoundaryUnder(APInt(8, 0x7f));
APSInt CharBoundaryOver(APInt(8, 0x80));
APSInt CharLarge(APInt(8, 0xd9));
APSInt CharMax(APInt(8, 0xff));
EXPECT_FALSE(False.isNegative());
EXPECT_TRUE(False.isNonNegative());
EXPECT_FALSE(False.isStrictlyPositive());
EXPECT_FALSE(True.isNegative());
EXPECT_TRUE(True.isNonNegative());
EXPECT_TRUE(True.isStrictlyPositive());
EXPECT_FALSE(CharMin.isNegative());
EXPECT_TRUE(CharMin.isNonNegative());
EXPECT_FALSE(CharMin.isStrictlyPositive());
EXPECT_FALSE(CharSmall.isNegative());
EXPECT_TRUE(CharSmall.isNonNegative());
EXPECT_TRUE(CharSmall.isStrictlyPositive());
EXPECT_FALSE(CharBoundaryUnder.isNegative());
EXPECT_TRUE(CharBoundaryUnder.isNonNegative());
EXPECT_TRUE(CharBoundaryUnder.isStrictlyPositive());
EXPECT_FALSE(CharBoundaryOver.isNegative());
EXPECT_TRUE(CharBoundaryOver.isNonNegative());
EXPECT_TRUE(CharBoundaryOver.isStrictlyPositive());
EXPECT_FALSE(CharLarge.isNegative());
EXPECT_TRUE(CharLarge.isNonNegative());
EXPECT_TRUE(CharLarge.isStrictlyPositive());
EXPECT_FALSE(CharMax.isNegative());
EXPECT_TRUE(CharMax.isNonNegative());
EXPECT_TRUE(CharMax.isStrictlyPositive());
}
} // end anonymous namespace
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