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https://github.com/RPCS3/rpcs3.git
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Rewrite the way LLVM JIT does memory allocation to allow use of more than one contiguous segment (#6771)
This commit is contained in:
Rajko Stojadinovic
Ivan
parent
42fc698186
commit
b49b4c8096
@ -1,4 +1,4 @@
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#include "types.h"
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#include "types.h"
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#include "JIT.h"
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#include "StrFmt.h"
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#include "File.h"
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@ -269,41 +269,237 @@ void asmjit::build_transaction_abort(asmjit::X86Assembler& c, unsigned char code
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#include <sys/mman.h>
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#endif
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// Memory manager mutex
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shared_mutex s_mutex;
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// Size of virtual memory area reserved: 512 MB
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static const u64 s_memory_size = 0x20000000;
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// Try to reserve a portion of virtual memory in the first 2 GB address space beforehand, if possible.
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static void* const s_memory = []() -> void*
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class LLVMSegmentAllocator
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{
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llvm::InitializeNativeTarget();
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llvm::InitializeNativeTargetAsmPrinter();
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llvm::InitializeNativeTargetAsmParser();
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LLVMLinkInMCJIT();
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public:
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// Size of virtual memory area reserved: default 512MB
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static constexpr u32 DEFAULT_SEGMENT_SIZE = 0x20000000;
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#ifdef MAP_32BIT
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auto ptr = ::mmap(nullptr, s_memory_size, PROT_NONE, MAP_ANON | MAP_PRIVATE | MAP_32BIT, -1, 0);
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if (ptr != MAP_FAILED)
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return ptr;
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#else
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for (u64 addr = 0x10000000; addr <= 0x80000000 - s_memory_size; addr += 0x1000000)
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LLVMSegmentAllocator()
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{
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if (auto ptr = utils::memory_reserve(s_memory_size, (void*)addr))
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llvm::InitializeNativeTarget();
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llvm::InitializeNativeTargetAsmPrinter();
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llvm::InitializeNativeTargetAsmParser();
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LLVMLinkInMCJIT();
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// Try to reserve as much virtual memory in the first 2 GB address space beforehand, if possible.
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Segment found_segs[16];
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u32 num_segs = 0;
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#ifdef MAP_32BIT
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u64 max_size = 0x80000000u;
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while (num_segs < 16)
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{
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return ptr;
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auto ptr = ::mmap(nullptr, max_size, PROT_NONE, MAP_ANON | MAP_PRIVATE | MAP_32BIT, -1, 0);
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if (ptr != MAP_FAILED)
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found_segs[num_segs++] = Segment(ptr, u32(max_size));
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else if (max_size > 0x1000000)
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max_size -= 0x1000000;
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else
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break;
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}
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#else
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u64 start_addr = 0x10000000;
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while (num_segs < 16)
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{
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u64 max_addr = 0;
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u64 max_size = 0x1000000;
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for (u64 addr = start_addr; addr <= (0x80000000u - max_size); addr += 0x1000000)
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{
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for (auto curr_size = max_size; (0x80000000u - curr_size) >= addr; curr_size += 0x1000000)
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{
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if (auto ptr = utils::memory_reserve(curr_size, (void*)addr))
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{
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if (max_addr == 0 || max_size < curr_size)
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{
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max_addr = addr;
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max_size = curr_size;
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}
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utils::memory_release(ptr, curr_size);
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}
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else
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break;
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}
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}
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if (max_addr == 0)
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break;
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if (auto ptr = utils::memory_reserve(max_size, (void*)max_addr))
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found_segs[num_segs++] = Segment(ptr, u32(max_size));
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start_addr = max_addr + max_size;
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}
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#endif
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if (num_segs)
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{
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if (num_segs > 1)
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{
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m_segs.resize(num_segs);
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for (u32 i = 0; i < num_segs; i++)
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m_segs[i] = found_segs[i];
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}
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else
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m_curr = found_segs[0];
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return;
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}
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if (auto ptr = utils::memory_reserve(DEFAULT_SEGMENT_SIZE))
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{
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m_curr.addr = (u8*)ptr;
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m_curr.size = DEFAULT_SEGMENT_SIZE;
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m_curr.used = 0;
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}
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}
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#endif
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return utils::memory_reserve(s_memory_size);
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}();
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void* allocate(u32 size)
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{
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if (m_curr.remaining() >= size)
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return m_curr.advance(size);
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static void* s_next = s_memory;
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if (reserve(size))
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return m_curr.advance(size);
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return nullptr;
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}
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bool reserve(u32 size)
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{
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if (size == 0)
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return true;
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store_curr();
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u32 best_idx = UINT_MAX;
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for (u32 i = 0, segs_size = (u32)m_segs.size(); i < segs_size; i++)
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{
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const auto seg_remaining = m_segs[i].remaining();
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if (seg_remaining < size)
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continue;
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if (best_idx == UINT_MAX || m_segs[best_idx].remaining() > seg_remaining)
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best_idx = i;
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}
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if (best_idx == UINT_MAX)
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{
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const auto size_to_reserve = (size > DEFAULT_SEGMENT_SIZE) ? ::align(size+4096, 4096) : DEFAULT_SEGMENT_SIZE;
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if (auto ptr = utils::memory_reserve(size_to_reserve))
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{
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best_idx = (u32)m_segs.size();
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m_segs.emplace_back(ptr, size_to_reserve);
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}
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else
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return false;
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}
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const auto& best_seg = m_segs[best_idx];
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if (best_seg.addr != m_curr.addr)
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m_curr = best_seg;
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return true;
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}
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std::pair<u64, u32> current_segment() const { return std::make_pair(u64(m_curr.addr), m_curr.size); }
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std::pair<u64, u32> find_segment(u64 addr) const
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{
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for (const auto& seg: m_segs)
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{
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if (addr < (u64)seg.addr)
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continue;
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const auto end_addr = u64(seg.addr) + seg.size;
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if (addr < end_addr)
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return std::make_pair(u64(seg.addr), seg.size);
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}
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return std::make_pair(0, 0);
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}
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void reset()
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{
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if (!m_segs.size())
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{
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if (m_curr.addr != nullptr)
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{
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utils::memory_decommit(m_curr.addr, m_curr.size);
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m_curr.used = 0;
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}
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return;
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}
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if (store_curr())
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m_curr = Segment();
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auto allocated_it = std::remove_if(m_segs.begin(), m_segs.end(), [](const Segment& seg) { return u64(seg.addr + seg.size) > 0x80000000u; });
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if (allocated_it != m_segs.end())
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{
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for (auto it = allocated_it; it != m_segs.end(); ++it)
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utils::memory_release(it->addr, it->size);
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m_segs.erase(allocated_it, m_segs.end());
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}
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for (auto& seg : m_segs)
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{
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utils::memory_decommit(seg.addr, seg.size);
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seg.used = 0;
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}
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}
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private:
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bool store_curr()
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{
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if (m_curr.addr != nullptr)
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{
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const auto wanted_addr = m_curr.addr;
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auto existing_it = std::find_if(m_segs.begin(), m_segs.end(), [wanted_addr](const Segment& seg) { return seg.addr == wanted_addr; });
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if (existing_it != m_segs.end())
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existing_it->used = m_curr.used;
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else
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m_segs.push_back(m_curr);
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return true;
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}
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return false;
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}
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struct Segment
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{
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Segment() {}
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Segment(void* addr, u32 size) : addr((u8*)addr), size(size) {}
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u8* addr = nullptr;
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u32 size = 0;
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u32 used = 0;
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u32 remaining() const
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{
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if (size > used)
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return size - used;
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return 0;
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}
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void* advance(u32 offset)
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{
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const auto prev_used = used;
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used += offset;
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return &addr[prev_used];
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}
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};
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Segment m_curr;
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std::vector<Segment> m_segs;
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};
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// Memory manager mutex
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static shared_mutex s_mutex;
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// LLVM Memory allocator
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static LLVMSegmentAllocator s_alloc;
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#ifdef _WIN32
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static std::deque<std::vector<RUNTIME_FUNCTION>> s_unwater;
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static std::deque<std::pair<u64, std::vector<RUNTIME_FUNCTION>>> s_unwater;
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static std::vector<std::vector<RUNTIME_FUNCTION>> s_unwind; // .pdata
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#else
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static std::deque<std::pair<u8*, std::size_t>> s_unfire;
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@ -331,9 +527,7 @@ extern void jit_finalize()
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s_unfire.clear();
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#endif
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utils::memory_decommit(s_memory, s_memory_size);
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s_next = s_memory;
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s_alloc.reset();
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}
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// Helper class
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@ -376,17 +570,25 @@ struct MemoryManager : llvm::RTDyldMemoryManager
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}
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// Verify address for small code model
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if ((u64)s_memory > 0x80000000 - s_memory_size ? (u64)addr - (u64)s_memory >= s_memory_size : addr >= 0x80000000)
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const u64 code_start = u64(m_code_addr);
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const s64 addr_diff = addr - code_start;
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if (addr_diff < INT_MIN || addr_diff > INT_MAX)
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{
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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// Allocate memory for trampolines
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if (m_tramps)
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{
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const s64 tramps_diff = u64(m_tramps) - code_start;
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if (tramps_diff < INT_MIN || tramps_diff > INT_MAX)
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m_tramps = nullptr; //previously allocated trampoline section too far away now
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}
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if (!m_tramps)
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{
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m_tramps = reinterpret_cast<decltype(m_tramps)>(s_next);
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utils::memory_commit(s_next, 4096, utils::protection::wx);
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s_next = (u8*)((u64)s_next + 4096);
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m_tramps = reinterpret_cast<decltype(m_tramps)>(s_alloc.allocate(4096));
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utils::memory_commit(m_tramps, 4096, utils::protection::wx);
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}
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// Create a trampoline
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@ -412,36 +614,57 @@ struct MemoryManager : llvm::RTDyldMemoryManager
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return {addr, llvm::JITSymbolFlags::Exported};
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}
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u8* allocateCodeSection(std::uintptr_t size, uint align, uint sec_id, llvm::StringRef sec_name) override
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bool needsToReserveAllocationSpace() override { return true; }
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void reserveAllocationSpace(uintptr_t CodeSize, uint32_t CodeAlign, uintptr_t RODataSize, uint32_t RODataAlign, uintptr_t RWDataSize, uint32_t RWDataAlign) override
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{
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const u32 wanted_code_size = ::align(u32(CodeSize), std::min(4096u, CodeAlign));
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const u32 wanted_rodata_size = ::align(u32(RODataSize), std::min(4096u, RODataAlign));
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const u32 wanted_rwdata_size = ::align(u32(RWDataSize), std::min(4096u, RWDataAlign));
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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// Simple allocation
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const u64 next = ::align((u64)s_next + size, 4096);
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// Setup segment for current module if needed
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s_alloc.reserve(wanted_code_size + wanted_rodata_size + wanted_rwdata_size);
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}
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if (next > (u64)s_memory + s_memory_size)
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u8* allocateCodeSection(std::uintptr_t size, uint align, uint sec_id, llvm::StringRef sec_name) override
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{
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void* ptr = nullptr;
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const u32 wanted_size = ::align(u32(size), 4096);
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{
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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// Simple allocation
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ptr = s_alloc.allocate(wanted_size);
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}
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if (ptr == nullptr)
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{
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LOG_FATAL(GENERAL, "LLVM: Out of memory (size=0x%llx, aligned 0x%x)", size, align);
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return nullptr;
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}
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utils::memory_commit(ptr, size, utils::protection::wx);
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m_code_addr = (u8*)ptr;
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utils::memory_commit(s_next, size, utils::protection::wx);
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m_code_addr = (u8*)s_next;
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LOG_NOTICE(GENERAL, "LLVM: Code section %u '%s' allocated -> %p (size=0x%llx, aligned 0x%x)", sec_id, sec_name.data(), s_next, size, align);
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return (u8*)std::exchange(s_next, (void*)next);
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LOG_NOTICE(GENERAL, "LLVM: Code section %u '%s' allocated -> %p (size=0x%llx, aligned 0x%x)", sec_id, sec_name.data(), ptr, size, align);
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return (u8*)ptr;
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}
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u8* allocateDataSection(std::uintptr_t size, uint align, uint sec_id, llvm::StringRef sec_name, bool is_ro) override
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{
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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void* ptr = nullptr;
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const u32 wanted_size = ::align(u32(size), 4096);
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{
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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// Simple allocation
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const u64 next = ::align((u64)s_next + size, 4096);
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// Simple allocation
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ptr = s_alloc.allocate(wanted_size);
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}
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if (next > (u64)s_memory + s_memory_size)
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if (ptr == nullptr)
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{
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LOG_FATAL(GENERAL, "LLVM: Out of memory (size=0x%llx, aligned 0x%x)", size, align);
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return nullptr;
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@ -451,10 +674,10 @@ struct MemoryManager : llvm::RTDyldMemoryManager
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{
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}
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utils::memory_commit(s_next, size);
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utils::memory_commit(ptr, size);
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LOG_NOTICE(GENERAL, "LLVM: Data section %u '%s' allocated -> %p (size=0x%llx, aligned 0x%x, %s)", sec_id, sec_name.data(), s_next, size, align, is_ro ? "ro" : "rw");
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return (u8*)std::exchange(s_next, (void*)next);
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LOG_NOTICE(GENERAL, "LLVM: Data section %u '%s' allocated -> %p (size=0x%llx, aligned 0x%x, %s)", sec_id, sec_name.data(), ptr, size, align, is_ro ? "ro" : "rw");
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return (u8*)ptr;
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}
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bool finalizeMemory(std::string* = nullptr) override
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@ -479,21 +702,22 @@ struct MemoryManager : llvm::RTDyldMemoryManager
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#ifdef _WIN32
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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// Use s_memory as a BASE, compute the difference
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const u64 unwind_diff = (u64)addr - (u64)s_memory;
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// Fix RUNTIME_FUNCTION records (.pdata section)
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auto pdata = std::move(s_unwater.front());
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decltype(s_unwater)::value_type pdata_entry = std::move(s_unwater.front());
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s_unwater.pop_front();
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// Use given memory segment as a BASE, compute the difference
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const u64 segment_start = pdata_entry.first;
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const u64 unwind_diff = (u64)addr - segment_start;
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auto& pdata = pdata_entry.second;
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for (auto& rf : pdata)
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{
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rf.UnwindData += static_cast<DWORD>(unwind_diff);
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}
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// Register .xdata UNWIND_INFO structs
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if (!RtlAddFunctionTable(pdata.data(), (DWORD)pdata.size(), (u64)s_memory))
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if (!RtlAddFunctionTable(pdata.data(), (DWORD)pdata.size(), segment_start))
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{
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LOG_ERROR(GENERAL, "RtlAddFunctionTable() failed! Error %u", GetLastError());
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}
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@ -635,8 +859,9 @@ struct EventListener : llvm::JITEventListener
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// Lock memory manager
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std::lock_guard lock(s_mutex);
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// Use s_memory as a BASE, compute the difference
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const u64 code_diff = (u64)m_mem.m_code_addr - (u64)s_memory;
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// Use current memory segment as a BASE, compute the difference
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const u64 segment_start = s_alloc.current_segment().first;
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const u64 code_diff = u64(m_mem.m_code_addr) - segment_start;
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// Fix RUNTIME_FUNCTION records (.pdata section)
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for (auto& rf : rfs)
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@ -645,7 +870,7 @@ struct EventListener : llvm::JITEventListener
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rf.EndAddress += static_cast<DWORD>(code_diff);
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}
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s_unwater.emplace_back(std::move(rfs));
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s_unwater.emplace_back(segment_start, std::move(rfs));
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}
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}
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#endif
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