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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Platform-specific code for Starboard goes here. Starboard is the platform
// abstraction layer for Cobalt, an HTML5 container used mainly by YouTube
// apps in the living room.
#include "src/base/lazy-instance.h"
#include "src/base/macros.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
#include "src/base/timezone-cache.h"
#include "src/base/utils/random-number-generator.h"
#include "starboard/client_porting/eztime/eztime.h"
#include "starboard/common/condition_variable.h"
#include "starboard/common/log.h"
#include "starboard/common/string.h"
#include "starboard/configuration.h"
#include "starboard/configuration_constants.h"
#include "starboard/memory.h"
#include "starboard/time.h"
#include "starboard/time_zone.h"
namespace v8 {
namespace base {
#ifdef __arm__
bool OS::ArmUsingHardFloat() {
// GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
// the Floating Point ABI used (PCS stands for Procedure Call Standard).
// We use these as well as a couple of other defines to statically determine
// what FP ABI used.
// GCC versions 4.4 and below don't support hard-fp.
// GCC versions 4.5 may support hard-fp without defining __ARM_PCS or
// __ARM_PCS_VFP.
#define GCC_VERSION \
(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
#if GCC_VERSION >= 40600 && !defined(__clang__)
#if defined(__ARM_PCS_VFP)
return true;
#else
return false;
#endif
#elif GCC_VERSION < 40500 && !defined(__clang__)
return false;
#else
#if defined(__ARM_PCS_VFP)
return true;
#elif defined(__ARM_PCS) || defined(__SOFTFP__) || defined(__SOFTFP) || \
!defined(__VFP_FP__)
return false;
#else
#error \
"Your version of compiler does not report the FP ABI compiled for." \
"Please report it on this issue" \
"http://code.google.com/p/v8/issues/detail?id=2140"
#endif
#endif
#undef GCC_VERSION
}
#endif // def __arm__
namespace {
static LazyInstance<RandomNumberGenerator>::type
platform_random_number_generator = LAZY_INSTANCE_INITIALIZER;
static LazyMutex rng_mutex = LAZY_MUTEX_INITIALIZER;
bool g_hard_abort = false;
// We only use this stack size to get the topmost stack frame.
const int kStackSize = 1;
} // namespace
void OS::Initialize(bool hard_abort, const char* const gc_fake_mmap) {
g_hard_abort = hard_abort;
// This is only used on Posix, we don't need to use it for anything.
}
int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) {
#if SB_API_VERSION >= 12
if (!SbTimeIsTimeThreadNowSupported()) return -1;
#endif
#if SB_API_VERSION >= 12 || SB_HAS(TIME_THREAD_NOW)
SbTimeMonotonic thread_now = SbTimeGetMonotonicThreadNow();
*secs = thread_now / kSbTimeSecond;
*usecs = thread_now % kSbTimeSecond;
return 0;
#else
return -1;
#endif
}
double OS::TimeCurrentMillis() { return Time::Now().ToJsTime(); }
int OS::ActivationFrameAlignment() {
#if V8_TARGET_ARCH_ARM
// On EABI ARM targets this is required for fp correctness in the
// runtime system.
return 8;
#elif V8_TARGET_ARCH_MIPS
return 8;
#elif V8_TARGET_ARCH_S390
return 8;
#else
// Otherwise we just assume 16 byte alignment, i.e.:
// - With gcc 4.4 the tree vectorization optimizer can generate code
// that requires 16 byte alignment such as movdqa on x86.
// - Mac OS X, PPC and Solaris (64-bit) activation frames must
// be 16 byte-aligned; see "Mac OS X ABI Function Call Guide"
return 16;
#endif
}
// static
size_t OS::AllocatePageSize() { return kSbMemoryPageSize; }
// static
size_t OS::CommitPageSize() { return kSbMemoryPageSize; }
// static
void OS::SetRandomMmapSeed(int64_t seed) { SB_NOTIMPLEMENTED(); }
// static
void* OS::GetRandomMmapAddr() { return nullptr; }
void* Allocate(void* address, size_t size, OS::MemoryPermission access) {
SbMemoryMapFlags sb_flags;
switch (access) {
case OS::MemoryPermission::kNoAccess:
sb_flags = SbMemoryMapFlags(0);
break;
case OS::MemoryPermission::kReadWrite:
sb_flags = SbMemoryMapFlags(kSbMemoryMapProtectReadWrite);
break;
default:
SB_LOG(ERROR) << "The requested memory allocation access is not"
" implemented for Starboard: "
<< static_cast<int>(access);
return nullptr;
}
void* result = SbMemoryMap(size, sb_flags, "v8::Base::Allocate");
if (result == SB_MEMORY_MAP_FAILED) {
return nullptr;
}
return result;
}
// static
void* OS::Allocate(void* address, size_t size, size_t alignment,
MemoryPermission access) {
size_t page_size = AllocatePageSize();
DCHECK_EQ(0, size % page_size);
DCHECK_EQ(0, alignment % page_size);
address = AlignedAddress(address, alignment);
// Add the maximum misalignment so we are guaranteed an aligned base address.
size_t request_size = size + (alignment - page_size);
request_size = RoundUp(request_size, OS::AllocatePageSize());
void* result = base::Allocate(address, request_size, access);
if (result == nullptr) return nullptr;
// Unmap memory allocated before the aligned base address.
uint8_t* base = static_cast<uint8_t*>(result);
uint8_t* aligned_base = reinterpret_cast<uint8_t*>(
RoundUp(reinterpret_cast<uintptr_t>(base), alignment));
if (aligned_base != base) {
DCHECK_LT(base, aligned_base);
size_t prefix_size = static_cast<size_t>(aligned_base - base);
CHECK(Free(base, prefix_size));
request_size -= prefix_size;
}
// Unmap memory allocated after the potentially unaligned end.
if (size != request_size) {
DCHECK_LT(size, request_size);
size_t suffix_size = request_size - size;
CHECK(Free(aligned_base + size, suffix_size));
request_size -= suffix_size;
}
DCHECK_EQ(size, request_size);
return static_cast<void*>(aligned_base);
}
// static
bool OS::Free(void* address, const size_t size) {
return SbMemoryUnmap(address, size);
}
// static
bool OS::Release(void* address, size_t size) {
return SbMemoryUnmap(address, size);
}
// static
bool OS::SetPermissions(void* address, size_t size, MemoryPermission access) {
SbMemoryMapFlags new_protection;
switch (access) {
case OS::MemoryPermission::kNoAccess:
new_protection = SbMemoryMapFlags(0);
break;
case OS::MemoryPermission::kRead:
new_protection = SbMemoryMapFlags(kSbMemoryMapProtectRead);
case OS::MemoryPermission::kReadWrite:
new_protection = SbMemoryMapFlags(kSbMemoryMapProtectReadWrite);
break;
case OS::MemoryPermission::kReadExecute:
#if SB_CAN(MAP_EXECUTABLE_MEMORY)
new_protection =
SbMemoryMapFlags(kSbMemoryMapProtectRead | kSbMemoryMapProtectExec);
#else
UNREACHABLE();
#endif
break;
default:
// All other types are not supported by Starboard.
return false;
}
return SbMemoryProtect(address, size, new_protection);
}
// static
bool OS::HasLazyCommits() {
SB_NOTIMPLEMENTED();
return false;
}
void OS::Sleep(TimeDelta interval) { SbThreadSleep(interval.InMicroseconds()); }
void OS::Abort() { SbSystemBreakIntoDebugger(); }
void OS::DebugBreak() { SbSystemBreakIntoDebugger(); }
class StarboardMemoryMappedFile final : public OS::MemoryMappedFile {
public:
~StarboardMemoryMappedFile() final;
void* memory() const final {
SB_NOTIMPLEMENTED();
return nullptr;
}
size_t size() const final {
SB_NOTIMPLEMENTED();
return 0u;
}
};
// static
OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name,
FileMode mode) {
SB_NOTIMPLEMENTED();
return nullptr;
}
// static
OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name,
size_t size, void* initial) {
SB_NOTIMPLEMENTED();
return nullptr;
}
StarboardMemoryMappedFile::~StarboardMemoryMappedFile() { SB_NOTIMPLEMENTED(); }
int OS::GetCurrentProcessId() {
SB_NOTIMPLEMENTED();
return 0;
}
int OS::GetCurrentThreadId() { return SbThreadGetId(); }
int OS::GetLastError() { return SbSystemGetLastError(); }
// ----------------------------------------------------------------------------
// POSIX stdio support.
//
FILE* OS::FOpen(const char* path, const char* mode) {
SB_NOTIMPLEMENTED();
return nullptr;
}
bool OS::Remove(const char* path) {
SB_NOTIMPLEMENTED();
return false;
}
char OS::DirectorySeparator() { return kSbFileSepChar; }
bool OS::isDirectorySeparator(const char ch) {
return ch == DirectorySeparator();
}
FILE* OS::OpenTemporaryFile() {
SB_NOTIMPLEMENTED();
return nullptr;
}
const char* const OS::LogFileOpenMode = "\0";
void OS::Print(const char* format, ...) {
va_list args;
va_start(args, format);
VPrint(format, args);
va_end(args);
}
void OS::VPrint(const char* format, va_list args) {
SbLogRawFormat(format, args);
}
void OS::FPrint(FILE* out, const char* format, ...) {
va_list args;
va_start(args, format);
VPrintError(format, args);
va_end(args);
}
void OS::VFPrint(FILE* out, const char* format, va_list args) {
SbLogRawFormat(format, args);
}
void OS::PrintError(const char* format, ...) {
va_list args;
va_start(args, format);
VPrintError(format, args);
va_end(args);
}
void OS::VPrintError(const char* format, va_list args) {
// Starboard has no concept of stderr vs stdout.
SbLogRawFormat(format, args);
}
int OS::SNPrintF(char* str, int length, const char* format, ...) {
va_list args;
va_start(args, format);
int result = VSNPrintF(str, length, format, args);
va_end(args);
return result;
}
int OS::VSNPrintF(char* str, int length, const char* format, va_list args) {
int n = SbStringFormat(str, length, format, args);
if (n < 0 || n >= length) {
// If the length is zero, the assignment fails.
if (length > 0) str[length - 1] = '\0';
return -1;
} else {
return n;
}
}
// ----------------------------------------------------------------------------
// POSIX string support.
//
void OS::StrNCpy(char* dest, int length, const char* src, size_t n) {
SbStringCopy(dest, src, n);
}
// ----------------------------------------------------------------------------
// POSIX thread support.
//
class Thread::PlatformData {
public:
PlatformData() : thread_(kSbThreadInvalid) {}
SbThread thread_; // Thread handle for pthread.
// Synchronizes thread creation
Mutex thread_creation_mutex_;
};
Thread::Thread(const Options& options)
: data_(new PlatformData),
stack_size_(options.stack_size()),
start_semaphore_(nullptr) {
set_name(options.name());
}
Thread::~Thread() { delete data_; }
static void SetThreadName(const char* name) { SbThreadSetName(name); }
static void* ThreadEntry(void* arg) {
Thread* thread = reinterpret_cast<Thread*>(arg);
// We take the lock here to make sure that pthread_create finished first since
// we don't know which thread will run first (the original thread or the new
// one).
{ LockGuard<Mutex> lock_guard(&thread->data()->thread_creation_mutex_); }
SetThreadName(thread->name());
// DCHECK_NE(thread->data()->thread_, kNoThread);
thread->NotifyStartedAndRun();
return nullptr;
}
void Thread::set_name(const char* name) {
strncpy(name_, name, sizeof(name_));
name_[sizeof(name_) - 1] = '\0';
}
bool Thread::Start() {
data_->thread_ =
SbThreadCreate(stack_size_, kSbThreadNoPriority, kSbThreadNoAffinity,
true, name_, ThreadEntry, this);
return SbThreadIsValid(data_->thread_);
}
void Thread::Join() { SbThreadJoin(data_->thread_, nullptr); }
Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
return SbThreadCreateLocalKey(nullptr);
}
void Thread::DeleteThreadLocalKey(LocalStorageKey key) {
SbThreadDestroyLocalKey(key);
}
void* Thread::GetThreadLocal(LocalStorageKey key) {
return SbThreadGetLocalValue(key);
}
void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
bool result = SbThreadSetLocalValue(key, value);
DCHECK(result);
}
class StarboardTimezoneCache : public TimezoneCache {
public:
void Clear(TimeZoneDetection time_zone_detection) override {}
~StarboardTimezoneCache() override {}
protected:
static const int msPerSecond = 1000;
};
class StarboardDefaultTimezoneCache : public StarboardTimezoneCache {
public:
const char* LocalTimezone(double time_ms) override {
return SbTimeZoneGetName();
}
double LocalTimeOffset(double time_ms, bool is_utc) override {
// SbTimeZOneGetCurrent returns an offset west of Greenwich, which has the
// opposite sign V8 expects.
// The starboard function returns offset in minutes. We convert to return
// value in milliseconds.
return SbTimeZoneGetCurrent() * 60.0 * msPerSecond * (-1);
}
double DaylightSavingsOffset(double time_ms) override {
EzTimeValue value = EzTimeValueFromSbTime(SbTimeGetNow());
EzTimeExploded ez_exploded;
bool result =
EzTimeValueExplode(&value, kEzTimeZoneLocal, &ez_exploded, NULL);
return ez_exploded.tm_isdst > 0 ? 3600 * msPerSecond : 0;
}
~StarboardDefaultTimezoneCache() override {}
};
TimezoneCache* OS::CreateTimezoneCache() {
return new StarboardDefaultTimezoneCache();
}
std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
SB_NOTIMPLEMENTED();
return {};
}
void OS::SignalCodeMovingGC() { SB_NOTIMPLEMENTED(); }
void OS::AdjustSchedulingParams() {}
bool OS::DiscardSystemPages(void* address, size_t size) {
// Starboard API does not support this function yet.
return true;
}
// static
Stack::StackSlot Stack::GetCurrentStackPosition() {
void* addresses[kStackSize];
const size_t count = SbSystemGetStack(addresses, kStackSize);
if (count > 0) {
return addresses[0];
} else {
return nullptr;
}
}
} // namespace base
} // namespace v8
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