inline void VM::updateStackLimit()
{
#if PLATFORM(WIN)
void* lastStackLimit = m_stackLimit;
#endif
if (m_stackPointerAtVMEntry) {
ASSERT(wtfThreadData().stack().isGrowingDownward());
char* startOfStack = reinterpret_cast<char*>(m_stackPointerAtVMEntry);
#if ENABLE(FTL_JIT)
m_stackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_reservedZoneSize + m_largestFTLStackSize);
m_ftlStackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_reservedZoneSize + 2 * m_largestFTLStackSize);
#else
m_stackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_reservedZoneSize);
#endif
} else {
#if ENABLE(FTL_JIT)
m_stackLimit = wtfThreadData().stack().recursionLimit(m_reservedZoneSize + m_largestFTLStackSize);
m_ftlStackLimit = wtfThreadData().stack().recursionLimit(m_reservedZoneSize + 2 * m_largestFTLStackSize);
#else
m_stackLimit = wtfThreadData().stack().recursionLimit(m_reservedZoneSize);
#endif
}
#if PLATFORM(WIN)
if (lastStackLimit != m_stackLimit)
preCommitStackMemory(m_stackLimit);
#endif
}
inline void VM::updateStackLimits()
{
#if PLATFORM(WIN)
void* lastSoftStackLimit = m_softStackLimit;
#endif
size_t reservedZoneSize = Options::reservedZoneSize();
if (m_stackPointerAtVMEntry) {
ASSERT(wtfThreadData().stack().isGrowingDownward());
char* startOfStack = reinterpret_cast<char*>(m_stackPointerAtVMEntry);
m_softStackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_currentSoftReservedZoneSize);
m_stackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), reservedZoneSize);
} else {
m_softStackLimit = wtfThreadData().stack().recursionLimit(m_currentSoftReservedZoneSize);
m_stackLimit = wtfThreadData().stack().recursionLimit(reservedZoneSize);
}
#if PLATFORM(WIN)
// We only need to precommit stack memory dictated by the VM::m_softStackLimit limit.
// This is because VM::m_softStackLimit applies to stack usage by LLINT asm or JIT
// generated code which can allocate stack space that the C++ compiler does not know
// about. As such, we have to precommit that stack memory manually.
//
// In contrast, we do not need to worry about VM::m_stackLimit because that limit is
// used exclusively by C++ code, and the C++ compiler will automatically commit the
// needed stack pages.
if (lastSoftStackLimit != m_softStackLimit)
preCommitStackMemory(m_softStackLimit);
#endif
}
