mirror of
https://github.com/dart-lang/sdk
synced 2024-09-05 00:13:50 +00:00
Reland "[vm] Align heap allocations to 2GB regions in comp ptr mode"
Fixed the mac build.
This reverts commit 0ed3fb3dee
.
Bug: https://github.com/dart-lang/sdk/issues/45059
Change-Id: I0cd6710a641b195403dda717108bdbe3395a21fa
TEST=CI
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/186340
Commit-Queue: Liam Appelbe <liama@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
This commit is contained in:
parent
8f9cdb3b2f
commit
be0978cbde
|
@ -673,6 +673,7 @@ char* Dart::Cleanup() {
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IsolateGroupReloadContext::SetFileModifiedCallback(NULL);
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Service::SetEmbedderStreamCallbacks(NULL, NULL);
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#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
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VirtualMemory::Cleanup();
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return NULL;
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}
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@ -392,6 +392,11 @@ OldPage* PageSpace::AllocateLargePage(intptr_t size, OldPage::PageType type) {
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if (page == nullptr) {
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IncreaseCapacityInWordsLocked(-page_size_in_words);
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return nullptr;
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} else {
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intptr_t actual_size_in_words = page->memory_->size() >> kWordSizeLog2;
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if (actual_size_in_words != page_size_in_words) {
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IncreaseCapacityInWordsLocked(actual_size_in_words - page_size_in_words);
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}
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}
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if (is_exec) {
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AddExecPageLocked(page);
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@ -2510,8 +2510,12 @@ void Object::InitializeObject(uword address, intptr_t class_id, intptr_t size) {
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// If the size is greater than both kNewAllocatableSize and
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// kAllocatablePageSize, the object must have been allocated to a new
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// large page, which must already have been zero initialized by the OS.
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#if defined(DART_COMPRESSED_POINTERS)
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needs_init = true;
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#else
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needs_init = Heap::IsAllocatableInNewSpace(size) ||
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Heap::IsAllocatableViaFreeLists(size);
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#endif
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} else {
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initial_value = static_cast<uword>(null_);
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needs_init = true;
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@ -19,12 +19,13 @@ void VirtualMemory::Truncate(intptr_t new_size) {
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ASSERT(new_size <= size());
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if (reserved_.size() ==
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region_.size()) { // Don't create holes in reservation.
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FreeSubSegment(reinterpret_cast<void*>(start() + new_size),
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size() - new_size);
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reserved_.set_size(new_size);
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if (AliasOffset() != 0) {
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FreeSubSegment(reinterpret_cast<void*>(alias_.start() + new_size),
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alias_.size() - new_size);
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if (FreeSubSegment(reinterpret_cast<void*>(start() + new_size),
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size() - new_size)) {
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reserved_.set_size(new_size);
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if (AliasOffset() != 0) {
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FreeSubSegment(reinterpret_cast<void*>(alias_.start() + new_size),
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alias_.size() - new_size);
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}
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}
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}
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region_.Subregion(region_, 0, new_size);
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@ -32,6 +32,7 @@ class VirtualMemory {
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intptr_t AliasOffset() const { return alias_.start() - region_.start(); }
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static void Init();
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static void Cleanup();
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// Returns true if dual mapping is enabled.
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static bool DualMappingEnabled();
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@ -87,7 +88,7 @@ class VirtualMemory {
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// Free a sub segment. On operating systems that support it this
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// can give back the virtual memory to the system. Returns true on success.
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static void FreeSubSegment(void* address, intptr_t size);
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static bool FreeSubSegment(void* address, intptr_t size);
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// These constructors are only used internally when reserving new virtual
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// spaces. They do not reserve any virtual address space on their own.
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@ -51,6 +51,8 @@ void VirtualMemory::Init() {
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page_size_ = CalculatePageSize();
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}
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void VirtualMemory::Cleanup() {}
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static void Unmap(zx_handle_t vmar, uword start, uword end) {
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ASSERT(start <= end);
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const uword size = end - start;
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@ -174,10 +176,11 @@ VirtualMemory::~VirtualMemory() {
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}
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}
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void VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
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bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
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const uword start = reinterpret_cast<uword>(address);
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Unmap(zx_vmar_root_self(), start, start + size);
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LOG_INFO("zx_vmar_unmap(0x%p, 0x%lx) success\n", address, size);
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return true;
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}
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void VirtualMemory::Protect(void* address, intptr_t size, Protection mode) {
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@ -43,6 +43,43 @@ DECLARE_FLAG(bool, generate_perf_jitdump);
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uword VirtualMemory::page_size_ = 0;
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static void unmap(uword start, uword end);
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#if defined(DART_COMPRESSED_POINTERS)
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static uword compressed_heap_base_ = 0;
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static uint8_t* compressed_heap_pages_ = nullptr;
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static uword compressed_heap_minimum_free_page_id_ = 0;
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static Mutex* compressed_heap_mutex_ = nullptr;
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static constexpr intptr_t kCompressedHeapSize = 2 * GB;
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static constexpr intptr_t kCompressedHeapAlignment = 4 * GB;
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static constexpr intptr_t kCompressedHeapPageSize = kOldPageSize;
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static constexpr intptr_t kCompressedHeapNumPages =
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kCompressedHeapSize / kOldPageSize;
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static constexpr intptr_t kCompressedHeapBitmapSize =
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kCompressedHeapNumPages / 8;
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#endif // defined(DART_COMPRESSED_POINTERS)
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static void* GenericMapAligned(int prot,
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intptr_t size,
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intptr_t alignment,
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intptr_t allocated_size,
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int map_flags) {
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void* address = mmap(nullptr, allocated_size, prot, map_flags, -1, 0);
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LOG_INFO("mmap(nullptr, 0x%" Px ", %u, ...): %p\n", allocated_size, prot,
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address);
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if (address == MAP_FAILED) {
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return nullptr;
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}
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const uword base = reinterpret_cast<uword>(address);
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const uword aligned_base = Utils::RoundUp(base, alignment);
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unmap(base, aligned_base);
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unmap(aligned_base + size, base + allocated_size);
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return reinterpret_cast<void*>(aligned_base);
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}
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intptr_t VirtualMemory::CalculatePageSize() {
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const intptr_t page_size = getpagesize();
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ASSERT(page_size != 0);
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@ -51,6 +88,20 @@ intptr_t VirtualMemory::CalculatePageSize() {
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}
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void VirtualMemory::Init() {
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#if defined(DART_COMPRESSED_POINTERS)
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if (compressed_heap_pages_ == nullptr) {
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compressed_heap_pages_ = new uint8_t[kCompressedHeapBitmapSize];
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memset(compressed_heap_pages_, 0, kCompressedHeapBitmapSize);
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compressed_heap_base_ = reinterpret_cast<uword>(GenericMapAligned(
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PROT_READ | PROT_WRITE, kCompressedHeapSize, kCompressedHeapAlignment,
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kCompressedHeapSize + kCompressedHeapAlignment,
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MAP_PRIVATE | MAP_ANONYMOUS));
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ASSERT(compressed_heap_base_ != 0);
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ASSERT(Utils::IsAligned(compressed_heap_base_, kCompressedHeapAlignment));
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compressed_heap_mutex_ = new Mutex(NOT_IN_PRODUCT("compressed_heap_mutex"));
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}
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#endif // defined(DART_COMPRESSED_POINTERS)
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if (page_size_ != 0) {
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// Already initialized.
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return;
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@ -78,7 +129,7 @@ void VirtualMemory::Init() {
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intptr_t size = PageSize();
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intptr_t alignment = kOldPageSize;
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VirtualMemory* vm = AllocateAligned(size, alignment, true, "memfd-test");
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if (vm == NULL) {
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if (vm == nullptr) {
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LOG_INFO("memfd_create not supported; disabling dual mapping of code.\n");
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FLAG_dual_map_code = false;
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return;
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@ -115,6 +166,18 @@ void VirtualMemory::Init() {
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#endif
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}
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void VirtualMemory::Cleanup() {
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#if defined(DART_COMPRESSED_POINTERS)
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unmap(compressed_heap_base_, compressed_heap_base_ + kCompressedHeapSize);
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delete[] compressed_heap_pages_;
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delete compressed_heap_mutex_;
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compressed_heap_base_ = 0;
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compressed_heap_pages_ = nullptr;
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compressed_heap_minimum_free_page_id_ = 0;
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compressed_heap_mutex_ = nullptr;
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#endif // defined(DART_COMPRESSED_POINTERS)
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}
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bool VirtualMemory::DualMappingEnabled() {
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return FLAG_dual_map_code;
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}
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@ -156,12 +219,12 @@ static void* MapAligned(int fd,
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intptr_t size,
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intptr_t alignment,
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intptr_t allocated_size) {
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void* address =
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mmap(NULL, allocated_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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LOG_INFO("mmap(NULL, 0x%" Px ", PROT_NONE, ...): %p\n", allocated_size,
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void* address = mmap(nullptr, allocated_size, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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LOG_INFO("mmap(nullptr, 0x%" Px ", PROT_NONE, ...): %p\n", allocated_size,
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address);
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if (address == MAP_FAILED) {
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return NULL;
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return nullptr;
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}
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const uword base = reinterpret_cast<uword>(address);
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@ -176,7 +239,7 @@ static void* MapAligned(int fd,
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prot, address);
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if (address == MAP_FAILED) {
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unmap(base, base + allocated_size);
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return NULL;
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return nullptr;
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}
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ASSERT(address == reinterpret_cast<void*>(aligned_base));
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unmap(base, aligned_base);
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}
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#endif // defined(DUAL_MAPPING_SUPPORTED)
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#if defined(DART_COMPRESSED_POINTERS)
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uint8_t PageMask(uword page_id) {
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return static_cast<uint8_t>(1 << (page_id % 8));
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}
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bool IsCompressedHeapPageUsed(uword page_id) {
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if (page_id >= kCompressedHeapNumPages) return false;
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return compressed_heap_pages_[page_id / 8] & PageMask(page_id);
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}
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void SetCompressedHeapPageUsed(uword page_id) {
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ASSERT(page_id < kCompressedHeapNumPages);
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compressed_heap_pages_[page_id / 8] |= PageMask(page_id);
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}
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void ClearCompressedHeapPageUsed(uword page_id) {
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ASSERT(page_id < kCompressedHeapNumPages);
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compressed_heap_pages_[page_id / 8] &= ~PageMask(page_id);
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}
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static MemoryRegion MapInCompressedHeap(intptr_t size, intptr_t alignment) {
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ASSERT(alignment <= kCompressedHeapAlignment);
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const intptr_t allocated_size = Utils::RoundUp(size, kCompressedHeapPageSize);
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uword pages = allocated_size / kCompressedHeapPageSize;
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uword page_alignment = alignment > kCompressedHeapPageSize
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? alignment / kCompressedHeapPageSize
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: 1;
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MutexLocker ml(compressed_heap_mutex_);
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// Find a gap with enough empty pages, using the bitmap. Note that reading
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// outside the bitmap range always returns 0, so this loop will terminate.
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uword page_id =
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Utils::RoundUp(compressed_heap_minimum_free_page_id_, page_alignment);
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for (uword gap = 0;;) {
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if (IsCompressedHeapPageUsed(page_id)) {
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gap = 0;
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page_id = Utils::RoundUp(page_id + 1, page_alignment);
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} else {
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++gap;
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if (gap >= pages) {
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page_id += 1 - gap;
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break;
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}
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++page_id;
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}
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}
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ASSERT(page_id % page_alignment == 0);
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// Make sure we're not trying to allocate past the end of the heap.
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uword end = page_id + pages;
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if (end > kCompressedHeapSize / kCompressedHeapPageSize) {
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return MemoryRegion();
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}
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// Mark all the pages in the bitmap as allocated.
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for (uword i = page_id; i < end; ++i) {
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ASSERT(!IsCompressedHeapPageUsed(i));
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SetCompressedHeapPageUsed(i);
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}
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// Find the next free page, to speed up subsequent allocations.
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while (IsCompressedHeapPageUsed(compressed_heap_minimum_free_page_id_)) {
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++compressed_heap_minimum_free_page_id_;
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}
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uword address = compressed_heap_base_ + page_id * kCompressedHeapPageSize;
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ASSERT(Utils::IsAligned(address, kCompressedHeapPageSize));
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return MemoryRegion(reinterpret_cast<void*>(address), allocated_size);
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}
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static void UnmapInCompressedHeap(uword start, uword size) {
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ASSERT(Utils::IsAligned(start, kCompressedHeapPageSize));
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ASSERT(Utils::IsAligned(size, kCompressedHeapPageSize));
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MutexLocker ml(compressed_heap_mutex_);
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ASSERT(start >= compressed_heap_base_);
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uword page_id = (start - compressed_heap_base_) / kCompressedHeapPageSize;
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uword end = page_id + size / kCompressedHeapPageSize;
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for (uword i = page_id; i < end; ++i) {
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ClearCompressedHeapPageUsed(i);
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}
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if (page_id < compressed_heap_minimum_free_page_id_) {
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compressed_heap_minimum_free_page_id_ = page_id;
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}
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}
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static bool IsInCompressedHeap(uword address) {
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return address >= compressed_heap_base_ &&
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address < compressed_heap_base_ + kCompressedHeapSize;
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}
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#endif // defined(DART_COMPRESSED_POINTERS)
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VirtualMemory* VirtualMemory::AllocateAligned(intptr_t size,
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intptr_t alignment,
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bool is_executable,
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@ -199,6 +349,18 @@ VirtualMemory* VirtualMemory::AllocateAligned(intptr_t size,
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ASSERT(Utils::IsPowerOfTwo(alignment));
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ASSERT(Utils::IsAligned(alignment, PageSize()));
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ASSERT(name != nullptr);
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#if defined(DART_COMPRESSED_POINTERS)
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if (!is_executable) {
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MemoryRegion region = MapInCompressedHeap(size, alignment);
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if (region.pointer() == nullptr) {
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return nullptr;
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}
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mprotect(region.pointer(), region.size(), PROT_READ | PROT_WRITE);
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return new VirtualMemory(region, region);
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}
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#endif // defined(DART_COMPRESSED_POINTERS)
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const intptr_t allocated_size = size + alignment - PageSize();
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#if defined(DUAL_MAPPING_SUPPORTED)
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const bool dual_mapping =
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@ -206,18 +368,18 @@ VirtualMemory* VirtualMemory::AllocateAligned(intptr_t size,
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if (dual_mapping) {
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int fd = memfd_create(name, MFD_CLOEXEC);
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if (fd == -1) {
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return NULL;
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return nullptr;
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}
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if (ftruncate(fd, size) == -1) {
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close(fd);
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return NULL;
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return nullptr;
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}
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const int region_prot = PROT_READ | PROT_WRITE;
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void* region_ptr =
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MapAligned(fd, region_prot, size, alignment, allocated_size);
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if (region_ptr == NULL) {
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if (region_ptr == nullptr) {
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close(fd);
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return NULL;
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return nullptr;
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}
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// The mapping will be RX and stays that way until it will eventually be
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// unmapped.
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@ -228,10 +390,10 @@ VirtualMemory* VirtualMemory::AllocateAligned(intptr_t size,
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void* alias_ptr =
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MapAligned(fd, alias_prot, size, alignment, allocated_size);
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close(fd);
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if (alias_ptr == NULL) {
|
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if (alias_ptr == nullptr) {
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const uword region_base = reinterpret_cast<uword>(region_ptr);
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unmap(region_base, region_base + size);
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return NULL;
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return nullptr;
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}
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ASSERT(region_ptr != alias_ptr);
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MemoryRegion alias(alias_ptr, size);
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|
@ -250,16 +412,16 @@ VirtualMemory* VirtualMemory::AllocateAligned(intptr_t size,
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if (FLAG_dual_map_code) {
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int fd = memfd_create(name, MFD_CLOEXEC);
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if (fd == -1) {
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return NULL;
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return nullptr;
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}
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if (ftruncate(fd, size) == -1) {
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close(fd);
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return NULL;
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return nullptr;
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}
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||||
void* region_ptr = MapAligned(fd, prot, size, alignment, allocated_size);
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close(fd);
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if (region_ptr == NULL) {
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return NULL;
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if (region_ptr == nullptr) {
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return nullptr;
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}
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MemoryRegion region(region_ptr, size);
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return new VirtualMemory(region, region);
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|
@ -272,24 +434,23 @@ VirtualMemory* VirtualMemory::AllocateAligned(intptr_t size,
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map_flags |= MAP_JIT;
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}
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#endif // defined(HOST_OS_MACOS)
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void* address = mmap(NULL, allocated_size, prot, map_flags, -1, 0);
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LOG_INFO("mmap(NULL, 0x%" Px ", %u, ...): %p\n", allocated_size, prot,
|
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address);
|
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void* address =
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GenericMapAligned(prot, size, alignment, allocated_size, map_flags);
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if (address == MAP_FAILED) {
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return NULL;
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return nullptr;
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}
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|
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const uword base = reinterpret_cast<uword>(address);
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const uword aligned_base = Utils::RoundUp(base, alignment);
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unmap(base, aligned_base);
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unmap(aligned_base + size, base + allocated_size);
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MemoryRegion region(reinterpret_cast<void*>(aligned_base), size);
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MemoryRegion region(reinterpret_cast<void*>(address), size);
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return new VirtualMemory(region, region);
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}
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VirtualMemory::~VirtualMemory() {
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#if defined(DART_COMPRESSED_POINTERS)
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if (IsInCompressedHeap(reserved_.start())) {
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UnmapInCompressedHeap(reserved_.start(), reserved_.size());
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return;
|
||||
}
|
||||
#endif // defined(DART_COMPRESSED_POINTERS)
|
||||
if (vm_owns_region()) {
|
||||
unmap(reserved_.start(), reserved_.end());
|
||||
const intptr_t alias_offset = AliasOffset();
|
||||
|
@ -299,10 +460,16 @@ VirtualMemory::~VirtualMemory() {
|
|||
}
|
||||
}
|
||||
|
||||
void VirtualMemory::FreeSubSegment(void* address,
|
||||
intptr_t size) {
|
||||
bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
|
||||
const uword start = reinterpret_cast<uword>(address);
|
||||
#if defined(DART_COMPRESSED_POINTERS)
|
||||
// Don't free the sub segment if it's managed by the compressed pointer heap.
|
||||
if (IsInCompressedHeap(start)) {
|
||||
return false;
|
||||
}
|
||||
#endif // defined(DART_COMPRESSED_POINTERS)
|
||||
unmap(start, start + size);
|
||||
return true;
|
||||
}
|
||||
|
||||
void VirtualMemory::Protect(void* address, intptr_t size, Protection mode) {
|
||||
|
|
|
@ -24,9 +24,14 @@ VM_UNIT_TEST_CASE(AllocateVirtualMemory) {
|
|||
VirtualMemory::Allocate(kVirtualMemoryBlockSize, false, "test");
|
||||
EXPECT(vm != NULL);
|
||||
EXPECT(vm->address() != NULL);
|
||||
EXPECT_EQ(kVirtualMemoryBlockSize, vm->size());
|
||||
EXPECT_EQ(vm->start(), reinterpret_cast<uword>(vm->address()));
|
||||
#if defined(DART_COMPRESSED_POINTERS)
|
||||
EXPECT_EQ(kOldPageSize, vm->size());
|
||||
EXPECT_EQ(vm->start() + kOldPageSize, vm->end());
|
||||
#else
|
||||
EXPECT_EQ(kVirtualMemoryBlockSize, vm->size());
|
||||
EXPECT_EQ(vm->start() + kVirtualMemoryBlockSize, vm->end());
|
||||
#endif // defined(DART_COMPRESSED_POINTERS)
|
||||
EXPECT(vm->Contains(vm->start()));
|
||||
EXPECT(vm->Contains(vm->start() + 1));
|
||||
EXPECT(vm->Contains(vm->start() + kVirtualMemoryBlockSize - 1));
|
||||
|
|
|
@ -31,6 +31,8 @@ void VirtualMemory::Init() {
|
|||
page_size_ = CalculatePageSize();
|
||||
}
|
||||
|
||||
void VirtualMemory::Cleanup() {}
|
||||
|
||||
bool VirtualMemory::DualMappingEnabled() {
|
||||
return false;
|
||||
}
|
||||
|
@ -80,11 +82,11 @@ VirtualMemory::~VirtualMemory() {
|
|||
}
|
||||
}
|
||||
|
||||
void VirtualMemory::FreeSubSegment(void* address,
|
||||
intptr_t size) {
|
||||
bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
|
||||
if (VirtualFree(address, size, MEM_DECOMMIT) == 0) {
|
||||
FATAL1("VirtualFree failed: Error code %d\n", GetLastError());
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
void VirtualMemory::Protect(void* address, intptr_t size, Protection mode) {
|
||||
|
|
Loading…
Reference in a new issue