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Justine Tunney 2020-06-15 07:18:57 -07:00
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test/libc/runtime/itsatrap_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/limits.h"
#include "libc/runtime/runtime.h"
#include "libc/testlib/testlib.h"
/**
* @fileoverview Tests for arithmetic overflow traps.
*
* This module assumes -ftrapv, but not -fsanitize=undefined; since
* Ubsan provides a superset trapping functionality, and therefore
* overrides the prior. The nice thing about -ftrapv is that it doesn't
* leak huge amounts of information into the binary. So it's appropriate
* to enable in a release build.
*
* @note LLVM's implementation of the runtime for this crashes due to
* relying on undefined behavior lool, the very thing the flag was
* meant to help prevent, so we don't get punked by the compiler
* @see __addvsi3, __mulvsi3, etc.
*/
bool overflowed_;
void __on_arithmetic_overflow(void) {
overflowed_ = true;
}
void SetUp(void) {
overflowed_ = false;
}
/* 32-BIT SIGNED NEGATION */
TEST(__negvsi2, testMax) {
EXPECT_EQ(-INT_MAX, -VEIL("r", INT_MAX));
EXPECT_FALSE(overflowed_);
}
TEST(__negvsi2, testMin0) {
EXPROPRIATE(-VEIL("r", INT_MIN));
EXPECT_TRUE(overflowed_);
}
/* 64-BIT SIGNED NEGATION */
TEST(__negvdi2, testMax) {
EXPECT_EQ(-LONG_MAX, -VEIL("r", LONG_MAX));
EXPECT_FALSE(overflowed_);
}
TEST(__negvdi2, testMin0) {
EXPROPRIATE(-VEIL("r", LONG_MIN));
EXPECT_TRUE(overflowed_);
}
/* 32-BIT SIGNED MULTIPLICATION */
TEST(__mulvsi3, testMin0) {
EXPECT_EQ(0, 0 * VEIL("r", INT_MIN));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvsi3, testMin1) {
EXPECT_EQ(INT_MIN, 1 * VEIL("r", INT_MIN));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvsi3, testMin2) {
EXPROPRIATE(2 * VEIL("r", INT_MIN));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvsi3, testMax0) {
EXPECT_EQ(0, 0 * VEIL("r", INT_MAX));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvsi3, testMax1) {
EXPECT_EQ(INT_MAX, 1 * VEIL("r", INT_MAX));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvsi3, testMax2) {
EXPROPRIATE(2 * VEIL("r", INT_MAX));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvsi3, test7) {
EXPECT_EQ(0x70000000, 7 * VEIL("r", 0x10000000));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvsi3, test8) {
EXPROPRIATE(8 * VEIL("r", 0x10000000));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvsi3, test31337) {
EXPROPRIATE(0x31337 * VEIL("r", 0x31337));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvsi3, standAndDeliver_aNegativeTimesANegativeEqualsAPositive) {
EXPECT_EQ(25, -5 * VEIL("r", -5));
EXPECT_FALSE(overflowed_);
}
/* 64-BIT SIGNED MULTIPLICATION */
TEST(__mulvdi3, testMin0) {
EXPECT_EQ(0, 0 * VEIL("r", LONG_MIN));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvdi3, testMin1) {
EXPECT_EQ(LONG_MIN, 1 * VEIL("r", LONG_MIN));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvdi3, testMin2) {
EXPROPRIATE(2 * VEIL("r", LONG_MIN));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvdi3, testMax0) {
EXPECT_EQ(0, 0 * VEIL("r", LONG_MAX));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvdi3, testMax1) {
EXPECT_EQ(LONG_MAX, 1 * VEIL("r", LONG_MAX));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvdi3, testMax2) {
EXPROPRIATE(2 * VEIL("r", LONG_MAX));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvdi3, test7) {
EXPECT_EQ(0x7000000000000000l, 7 * VEIL("r", 0x1000000000000000l));
EXPECT_FALSE(overflowed_);
}
TEST(__mulvdi3, test8) {
EXPROPRIATE(8 * VEIL("r", 0x1000000000000000l));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvdi3, test31337) {
EXPROPRIATE(0x3133700000000l * VEIL("r", 0x3133700000000l));
EXPECT_TRUE(overflowed_);
}
TEST(__mulvdi3, standAndDeliver_aNegativeTimesANegativeEqualsAPositive) {
EXPECT_EQ(25l, -5l * VEIL("r", -5l));
EXPECT_FALSE(overflowed_);
}
/* 32-BIT SIGNED ADDITION */
TEST(__addvsi3, testMin1) {
EXPECT_EQ(INT_MIN + 1, 1 + VEIL("r", INT_MIN));
EXPECT_FALSE(overflowed_);
}
TEST(__addvsi3, testMax1) {
EXPROPRIATE(1 + VEIL("r", INT_MAX));
EXPECT_TRUE(overflowed_);
}
TEST(__addvsi3, testNegPos) {
EXPECT_EQ(2, -2 + VEIL("r", 4));
EXPECT_FALSE(overflowed_);
}
TEST(__addvsi3, testPosNeg) {
EXPECT_EQ(-2, 2 + VEIL("r", -4));
EXPECT_FALSE(overflowed_);
}
/* 64-BIT SIGNED ADDITION */
TEST(__addvdi3, testMin1) {
EXPECT_EQ(LONG_MIN + 1, 1 + VEIL("r", LONG_MIN));
EXPECT_FALSE(overflowed_);
}
TEST(__addvdi3, testMax1) {
EXPROPRIATE(1 + VEIL("r", LONG_MAX));
EXPECT_TRUE(overflowed_);
}
TEST(__addvdi3, testNegPos) {
EXPECT_EQ(2l, -2l + VEIL("r", 4l));
EXPECT_FALSE(overflowed_);
}
TEST(__addvdi3, testPosNeg) {
EXPECT_EQ(-2l, 2l + VEIL("r", -4l));
EXPECT_FALSE(overflowed_);
}
/* 32-BIT SIGNED SUBTRACTION */
TEST(__subvsi3, testMin1) {
EXPROPRIATE(VEIL("r", INT_MIN) - 1);
EXPECT_TRUE(overflowed_);
}
TEST(__subvsi3, testMax1) {
EXPECT_EQ(INT_MAX - 1, VEIL("r", INT_MAX) - 1);
EXPECT_FALSE(overflowed_);
}
TEST(__subvsi3, testPosNeg) {
EXPECT_EQ(-2, 2 - VEIL("r", 4));
EXPECT_FALSE(overflowed_);
}
/* 64-BIT SIGNED SUBTRACTION */
TEST(__subvdi3, testMin1) {
EXPROPRIATE(VEIL("r", LONG_MIN) - 1);
EXPECT_TRUE(overflowed_);
}
TEST(__subvdi3, testMax1) {
EXPECT_EQ(LONG_MAX - 1, VEIL("r", LONG_MAX) - 1);
EXPECT_FALSE(overflowed_);
}