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BeefRT/gperftools/src/tests/system-alloc_unittest.cc

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+// Copyright (c) 2007, 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: Arun Sharma
+
+#include "config_for_unittests.h"
+#include "system-alloc.h"
+#include <stdio.h>
+#if defined HAVE_STDINT_H
+#include <stdint.h>             // to get uintptr_t
+#elif defined HAVE_INTTYPES_H
+#include <inttypes.h>           // another place uintptr_t might be defined
+#endif
+#include <sys/types.h>
+#include <algorithm>
+#include <limits>
+#include "base/logging.h"               // for Check_GEImpl, Check_LTImpl, etc
+#include <gperftools/malloc_extension.h>    // for MallocExtension::instance
+#include "common.h"                     // for kAddressBits
+
+class ArraySysAllocator : public SysAllocator {
+public:
+  // Was this allocator invoked at least once?
+  bool invoked_;
+
+  ArraySysAllocator() : SysAllocator() {
+    ptr_ = 0;
+    invoked_ = false;
+  }
+
+  void* Alloc(size_t size, size_t *actual_size, size_t alignment) {
+    invoked_ = true;
+
+    if (size > kArraySize) {
+      return NULL;
+    }
+
+    void *result = &array_[ptr_];
+    uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
+
+    if (actual_size) {
+      *actual_size = size;
+    }
+
+    // Try to get more memory for alignment
+    size_t extra = alignment - (ptr & (alignment-1));
+    size += extra;
+    CHECK_LT(ptr_ + size, kArraySize);
+
+    if ((ptr & (alignment-1)) != 0) {
+      ptr += alignment - (ptr & (alignment-1));
+    }
+
+    ptr_ += size;
+    return reinterpret_cast<void *>(ptr);
+  }
+
+  void DumpStats() {
+  }
+
+private:
+  static const int kArraySize = 8 * 1024 * 1024;
+  char array_[kArraySize];
+  // We allocate the next chunk from here
+  int ptr_;
+
+};
+const int ArraySysAllocator::kArraySize;
+ArraySysAllocator a;
+
+static void TestBasicInvoked() {
+  MallocExtension::instance()->SetSystemAllocator(&a);
+
+  // An allocation size that is likely to trigger the system allocator.
+  // XXX: this is implementation specific.
+  char *p = new char[1024 * 1024];
+  delete [] p;
+
+  // Make sure that our allocator was invoked.
+  CHECK(a.invoked_);
+}
+
+#if 0  // could port this to various OSs, but won't bother for now
+TEST(AddressBits, CpuVirtualBits) {
+  // Check that kAddressBits is as least as large as either the number of bits
+  // in a pointer or as the number of virtual bits handled by the processor.
+  // To be effective this test must be run on each processor model.
+  const int kPointerBits = 8 * sizeof(void*);
+  const int kImplementedVirtualBits = NumImplementedVirtualBits();
+
+  CHECK_GE(kAddressBits, std::min(kImplementedVirtualBits, kPointerBits));
+}
+#endif
+
+static void TestBasicRetryFailTest() {
+  // Check with the allocator still works after a failed allocation.
+  //
+  // There is no way to call malloc and guarantee it will fail.  malloc takes a
+  // size_t parameter and the C++ standard does not constrain the size of
+  // size_t.  For example, consider an implementation where size_t is 32 bits
+  // and pointers are 64 bits.
+  //
+  // It is likely, though, that sizeof(size_t) == sizeof(void*).  In that case,
+  // the first allocation here might succeed but the second allocation must
+  // fail.
+  //
+  // If the second allocation succeeds, you will have to rewrite or
+  // disable this test.
+  // The weird parens are to avoid macro-expansion of 'max' on windows.
+  const size_t kHugeSize = (std::numeric_limits<size_t>::max)() / 2;
+  void* p1 = malloc(kHugeSize);
+  void* p2 = malloc(kHugeSize);
+  CHECK(p2 == NULL);
+  if (p1 != NULL) free(p1);
+
+  char* q = new char[1024];
+  CHECK(q != NULL);
+  delete [] q;
+}
+
+int main(int argc, char** argv) {
+  TestBasicInvoked();
+  TestBasicRetryFailTest();
+
+  printf("PASS\n");
+  return 0;
+}