Squashed 'third_party/gperftools/' content from commit 54505f1
Change-Id: Id02e833828732b0efe7dac722b8485279e67c5fa
git-subtree-dir: third_party/gperftools
git-subtree-split: 54505f1d50c2d1f4676f5e87090b64a117fd980e
diff --git a/src/tests/tcmalloc_large_unittest.cc b/src/tests/tcmalloc_large_unittest.cc
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+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+// Author: Michael Chastain
+//
+// This is a unit test for large allocations in malloc and friends.
+// "Large" means "so large that they overflow the address space".
+// For 32 bits, this means allocations near 2^32 bytes and 2^31 bytes.
+// For 64 bits, this means allocations near 2^64 bytes and 2^63 bytes.
+
+#include <stddef.h> // for size_t, NULL
+#include <stdlib.h> // for malloc, free, realloc
+#include <stdio.h>
+#include <set> // for set, etc
+
+#include "base/logging.h" // for operator<<, CHECK, etc
+
+using std::set;
+
+// Alloc a size that should always fail.
+
+void TryAllocExpectFail(size_t size) {
+ void* p1 = malloc(size);
+ CHECK(p1 == NULL);
+
+ void* p2 = malloc(1);
+ CHECK(p2 != NULL);
+
+ void* p3 = realloc(p2, size);
+ CHECK(p3 == NULL);
+
+ free(p2);
+}
+
+// Alloc a size that might work and might fail.
+// If it does work, touch some pages.
+
+void TryAllocMightFail(size_t size) {
+ unsigned char* p = static_cast<unsigned char*>(malloc(size));
+ if ( p != NULL ) {
+ unsigned char volatile* vp = p; // prevent optimizations
+ static const size_t kPoints = 1024;
+
+ for ( size_t i = 0; i < kPoints; ++i ) {
+ vp[i * (size / kPoints)] = static_cast<unsigned char>(i);
+ }
+
+ for ( size_t i = 0; i < kPoints; ++i ) {
+ CHECK(vp[i * (size / kPoints)] == static_cast<unsigned char>(i));
+ }
+
+ vp[size-1] = 'M';
+ CHECK(vp[size-1] == 'M');
+ }
+
+ free(p);
+}
+
+int main (int argc, char** argv) {
+ // Allocate some 0-byte objects. They better be unique.
+ // 0 bytes is not large but it exercises some paths related to
+ // large-allocation code.
+ {
+ static const int kZeroTimes = 1024;
+ printf("Test malloc(0) x %d\n", kZeroTimes);
+ set<char*> p_set;
+ for ( int i = 0; i < kZeroTimes; ++i ) {
+ char* p = new char;
+ CHECK(p != NULL);
+ CHECK(p_set.find(p) == p_set.end());
+ p_set.insert(p_set.end(), p);
+ }
+ // Just leak the memory.
+ }
+
+ // Grab some memory so that some later allocations are guaranteed to fail.
+ printf("Test small malloc\n");
+ void* p_small = malloc(4*1048576);
+ CHECK(p_small != NULL);
+
+ // Test sizes up near the maximum size_t.
+ // These allocations test the wrap-around code.
+ printf("Test malloc(0 - N)\n");
+ const size_t zero = 0;
+ static const size_t kMinusNTimes = 16384;
+ for ( size_t i = 1; i < kMinusNTimes; ++i ) {
+ TryAllocExpectFail(zero - i);
+ }
+
+ // Test sizes a bit smaller.
+ // The small malloc above guarantees that all these return NULL.
+ printf("Test malloc(0 - 1048576 - N)\n");
+ static const size_t kMinusMBMinusNTimes = 16384;
+ for ( size_t i = 0; i < kMinusMBMinusNTimes; ++i) {
+ TryAllocExpectFail(zero - 1048576 - i);
+ }
+
+ // Test sizes at half of size_t.
+ // These might or might not fail to allocate.
+ printf("Test malloc(max/2 +- N)\n");
+ static const size_t kHalfPlusMinusTimes = 64;
+ const size_t half = (zero - 2) / 2 + 1;
+ for ( size_t i = 0; i < kHalfPlusMinusTimes; ++i) {
+ TryAllocMightFail(half - i);
+ TryAllocMightFail(half + i);
+ }
+
+ printf("PASS\n");
+ return 0;
+}