mirror of
https://github.com/dart-lang/sdk
synced 2024-10-06 00:20:56 +00:00
0b85873fc8
With the upcoming deletion barrier, every update of a pointer field must know whether the previous value was a valid pointer. Currently, we always use StorePointer/StoreSmi, both for initialization and updates. Initialization, and thus the potential for overwriting garbage values, appears in three places: 1. Object::Allocate/Foo::New. 2. Creating isolate from full snapshot. 3. Allocation in generated code. Case 1 already null-initializes all underlying memory. Case 2 is addressed by this CL by exploiting that: i) fresh pages are zero-filled by OS, and ii) freelist headers use only even values. Case 3 is remains a TODO for future CLs. (An alternative solution for case 2 would have been to add an init_foo method for every set_foo called.) R=iposva@google.com Review URL: https://codereview.chromium.org//792163003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42584 260f80e4-7a28-3924-810f-c04153c831b5
111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#include "platform/assert.h"
|
|
#include "vm/unit_test.h"
|
|
#include "vm/virtual_memory.h"
|
|
|
|
namespace dart {
|
|
|
|
bool IsZero(char* begin, char* end) {
|
|
for (char* current = begin; current < end; ++current) {
|
|
if (*current != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
UNIT_TEST_CASE(AllocateVirtualMemory) {
|
|
const intptr_t kVirtualMemoryBlockSize = 64 * KB;
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
EXPECT(vm != NULL);
|
|
EXPECT(vm->address() != NULL);
|
|
EXPECT_EQ(kVirtualMemoryBlockSize, vm->size());
|
|
EXPECT_EQ(vm->start(), reinterpret_cast<uword>(vm->address()));
|
|
EXPECT_EQ(vm->start() + kVirtualMemoryBlockSize, vm->end());
|
|
EXPECT(vm->Contains(vm->start()));
|
|
EXPECT(vm->Contains(vm->start() + 1));
|
|
EXPECT(vm->Contains(vm->start() + kVirtualMemoryBlockSize - 1));
|
|
EXPECT(vm->Contains(vm->start() + (kVirtualMemoryBlockSize / 2)));
|
|
EXPECT(!vm->Contains(vm->start() - 1));
|
|
EXPECT(!vm->Contains(vm->end()));
|
|
EXPECT(!vm->Contains(vm->end() + 1));
|
|
EXPECT(!vm->Contains(0));
|
|
EXPECT(!vm->Contains(static_cast<uword>(-1)));
|
|
|
|
vm->Commit(false);
|
|
|
|
char* buf = reinterpret_cast<char*>(vm->address());
|
|
EXPECT(IsZero(buf, buf + vm->size()));
|
|
buf[0] = 'a';
|
|
buf[1] = 'c';
|
|
buf[2] = '/';
|
|
buf[3] = 'd';
|
|
buf[4] = 'c';
|
|
buf[5] = 0;
|
|
EXPECT_STREQ("ac/dc", buf);
|
|
|
|
delete vm;
|
|
}
|
|
|
|
|
|
UNIT_TEST_CASE(FreeVirtualMemory) {
|
|
// Reservations should always be handed back to OS upon destruction.
|
|
const intptr_t kVirtualMemoryBlockSize = 10 * MB;
|
|
const intptr_t kIterations = 900; // Enough to exhaust 32-bit address space.
|
|
for (intptr_t i = 0; i < kIterations; ++i) {
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
vm->Commit(false);
|
|
delete vm;
|
|
}
|
|
// Check that truncation does not introduce leaks.
|
|
for (intptr_t i = 0; i < kIterations; ++i) {
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
vm->Commit(false);
|
|
vm->Truncate(kVirtualMemoryBlockSize / 2, true);
|
|
delete vm;
|
|
}
|
|
for (intptr_t i = 0; i < kIterations; ++i) {
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
vm->Commit(true);
|
|
vm->Truncate(kVirtualMemoryBlockSize / 2, false);
|
|
delete vm;
|
|
}
|
|
for (intptr_t i = 0; i < kIterations; ++i) {
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
vm->Commit(true);
|
|
vm->Truncate(0, true);
|
|
delete vm;
|
|
}
|
|
for (intptr_t i = 0; i < kIterations; ++i) {
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
vm->Commit(false);
|
|
vm->Truncate(0, false);
|
|
delete vm;
|
|
}
|
|
}
|
|
|
|
|
|
UNIT_TEST_CASE(VirtualMemoryCommitPartial) {
|
|
const intptr_t kVirtualMemoryBlockSize = 3 * MB;
|
|
VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
|
|
EXPECT(vm != NULL);
|
|
// Commit only the middle MB and write to it.
|
|
const uword commit_start = vm->start() + (1 * MB);
|
|
const intptr_t kCommitSize = 1 * MB;
|
|
vm->Commit(commit_start, kCommitSize, false);
|
|
char* buf = reinterpret_cast<char*>(commit_start);
|
|
EXPECT(IsZero(buf, buf + kCommitSize));
|
|
buf[0] = 'f';
|
|
buf[1] = 'o';
|
|
buf[2] = 'o';
|
|
buf[3] = 0;
|
|
EXPECT_STREQ("foo", buf);
|
|
delete vm;
|
|
}
|
|
|
|
} // namespace dart
|