1 files changed, 0 insertions, 267 deletions

diff --git a/contrib/llvm/lib/ExecutionEngine/SectionMemoryManager.cpp b/contrib/llvm/lib/ExecutionEngine/SectionMemoryManager.cpp
deleted file mode 100644
index 925049b2a1b4..000000000000
--- a/contrib/llvm/lib/ExecutionEngine/SectionMemoryManager.cpp
+++ /dev/null
@@ -1,267 +0,0 @@
-//===- SectionMemoryManager.cpp - Memory manager for MCJIT/RtDyld *- C++ -*-==//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the section-based memory manager used by the MCJIT
-// execution engine and RuntimeDyld
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ExecutionEngine/SectionMemoryManager.h"
-#include "llvm/Config/config.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/Process.h"
-
-namespace llvm {
-
-uint8_t *SectionMemoryManager::allocateDataSection(uintptr_t Size,
-                                                   unsigned Alignment,
-                                                   unsigned SectionID,
-                                                   StringRef SectionName,
-                                                   bool IsReadOnly) {
-  if (IsReadOnly)
-    return allocateSection(SectionMemoryManager::AllocationPurpose::ROData,
-                           Size, Alignment);
-  return allocateSection(SectionMemoryManager::AllocationPurpose::RWData, Size,
-                         Alignment);
-}
-
-uint8_t *SectionMemoryManager::allocateCodeSection(uintptr_t Size,
-                                                   unsigned Alignment,
-                                                   unsigned SectionID,
-                                                   StringRef SectionName) {
-  return allocateSection(SectionMemoryManager::AllocationPurpose::Code, Size,
-                         Alignment);
-}
-
-uint8_t *SectionMemoryManager::allocateSection(
-    SectionMemoryManager::AllocationPurpose Purpose, uintptr_t Size,
-    unsigned Alignment) {
-  if (!Alignment)
-    Alignment = 16;
-
-  assert(!(Alignment & (Alignment - 1)) && "Alignment must be a power of two.");
-
-  uintptr_t RequiredSize = Alignment * ((Size + Alignment - 1) / Alignment + 1);
-  uintptr_t Addr = 0;
-
-  MemoryGroup &MemGroup = [&]() -> MemoryGroup & {
-    switch (Purpose) {
-    case AllocationPurpose::Code:
-      return CodeMem;
-    case AllocationPurpose::ROData:
-      return RODataMem;
-    case AllocationPurpose::RWData:
-      return RWDataMem;
-    }
-    llvm_unreachable("Unknown SectionMemoryManager::AllocationPurpose");
-  }();
-
-  // Look in the list of free memory regions and use a block there if one
-  // is available.
-  for (FreeMemBlock &FreeMB : MemGroup.FreeMem) {
-    if (FreeMB.Free.allocatedSize() >= RequiredSize) {
-      Addr = (uintptr_t)FreeMB.Free.base();
-      uintptr_t EndOfBlock = Addr + FreeMB.Free.allocatedSize();
-      // Align the address.
-      Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
-
-      if (FreeMB.PendingPrefixIndex == (unsigned)-1) {
-        // The part of the block we're giving out to the user is now pending
-        MemGroup.PendingMem.push_back(sys::MemoryBlock((void *)Addr, Size));
-
-        // Remember this pending block, such that future allocations can just
-        // modify it rather than creating a new one
-        FreeMB.PendingPrefixIndex = MemGroup.PendingMem.size() - 1;
-      } else {
-        sys::MemoryBlock &PendingMB =
-            MemGroup.PendingMem[FreeMB.PendingPrefixIndex];
-        PendingMB = sys::MemoryBlock(PendingMB.base(),
-                                     Addr + Size - (uintptr_t)PendingMB.base());
-      }
-
-      // Remember how much free space is now left in this block
-      FreeMB.Free =
-          sys::MemoryBlock((void *)(Addr + Size), EndOfBlock - Addr - Size);
-      return (uint8_t *)Addr;
-    }
-  }
-
-  // No pre-allocated free block was large enough. Allocate a new memory region.
-  // Note that all sections get allocated as read-write.  The permissions will
-  // be updated later based on memory group.
-  //
-  // FIXME: It would be useful to define a default allocation size (or add
-  // it as a constructor parameter) to minimize the number of allocations.
-  //
-  // FIXME: Initialize the Near member for each memory group to avoid
-  // interleaving.
-  std::error_code ec;
-  sys::MemoryBlock MB = MMapper.allocateMappedMemory(
-      Purpose, RequiredSize, &MemGroup.Near,
-      sys::Memory::MF_READ | sys::Memory::MF_WRITE, ec);
-  if (ec) {
-    // FIXME: Add error propagation to the interface.
-    return nullptr;
-  }
-
-  // Save this address as the basis for our next request
-  MemGroup.Near = MB;
-
-  // Remember that we allocated this memory
-  MemGroup.AllocatedMem.push_back(MB);
-  Addr = (uintptr_t)MB.base();
-  uintptr_t EndOfBlock = Addr + MB.allocatedSize();
-
-  // Align the address.
-  Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
-
-  // The part of the block we're giving out to the user is now pending
-  MemGroup.PendingMem.push_back(sys::MemoryBlock((void *)Addr, Size));
-
-  // The allocateMappedMemory may allocate much more memory than we need. In
-  // this case, we store the unused memory as a free memory block.
-  unsigned FreeSize = EndOfBlock - Addr - Size;
-  if (FreeSize > 16) {
-    FreeMemBlock FreeMB;
-    FreeMB.Free = sys::MemoryBlock((void *)(Addr + Size), FreeSize);
-    FreeMB.PendingPrefixIndex = (unsigned)-1;
-    MemGroup.FreeMem.push_back(FreeMB);
-  }
-
-  // Return aligned address
-  return (uint8_t *)Addr;
-}
-
-bool SectionMemoryManager::finalizeMemory(std::string *ErrMsg) {
-  // FIXME: Should in-progress permissions be reverted if an error occurs?
-  std::error_code ec;
-
-  // Make code memory executable.
-  ec = applyMemoryGroupPermissions(CodeMem,
-                                   sys::Memory::MF_READ | sys::Memory::MF_EXEC);
-  if (ec) {
-    if (ErrMsg) {
-      *ErrMsg = ec.message();
-    }
-    return true;
-  }
-
-  // Make read-only data memory read-only.
-  ec = applyMemoryGroupPermissions(RODataMem,
-                                   sys::Memory::MF_READ | sys::Memory::MF_EXEC);
-  if (ec) {
-    if (ErrMsg) {
-      *ErrMsg = ec.message();
-    }
-    return true;
-  }
-
-  // Read-write data memory already has the correct permissions
-
-  // Some platforms with separate data cache and instruction cache require
-  // explicit cache flush, otherwise JIT code manipulations (like resolved
-  // relocations) will get to the data cache but not to the instruction cache.
-  invalidateInstructionCache();
-
-  return false;
-}
-
-static sys::MemoryBlock trimBlockToPageSize(sys::MemoryBlock M) {
-  static const size_t PageSize = sys::Process::getPageSizeEstimate();
-
-  size_t StartOverlap =
-      (PageSize - ((uintptr_t)M.base() % PageSize)) % PageSize;
-
-  size_t TrimmedSize = M.allocatedSize();
-  TrimmedSize -= StartOverlap;
-  TrimmedSize -= TrimmedSize % PageSize;
-
-  sys::MemoryBlock Trimmed((void *)((uintptr_t)M.base() + StartOverlap),
-                           TrimmedSize);
-
-  assert(((uintptr_t)Trimmed.base() % PageSize) == 0);
-  assert((Trimmed.allocatedSize() % PageSize) == 0);
-  assert(M.base() <= Trimmed.base() &&
-         Trimmed.allocatedSize() <= M.allocatedSize());
-
-  return Trimmed;
-}
-
-std::error_code
-SectionMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGroup,
-                                                  unsigned Permissions) {
-  for (sys::MemoryBlock &MB : MemGroup.PendingMem)
-    if (std::error_code EC = MMapper.protectMappedMemory(MB, Permissions))
-      return EC;
-
-  MemGroup.PendingMem.clear();
-
-  // Now go through free blocks and trim any of them that don't span the entire
-  // page because one of the pending blocks may have overlapped it.
-  for (FreeMemBlock &FreeMB : MemGroup.FreeMem) {
-    FreeMB.Free = trimBlockToPageSize(FreeMB.Free);
-    // We cleared the PendingMem list, so all these pointers are now invalid
-    FreeMB.PendingPrefixIndex = (unsigned)-1;
-  }
-
-  // Remove all blocks which are now empty
-  MemGroup.FreeMem.erase(remove_if(MemGroup.FreeMem,
-                                   [](FreeMemBlock &FreeMB) {
-                                     return FreeMB.Free.allocatedSize() == 0;
-                                   }),
-                         MemGroup.FreeMem.end());
-
-  return std::error_code();
-}
-
-void SectionMemoryManager::invalidateInstructionCache() {
-  for (sys::MemoryBlock &Block : CodeMem.PendingMem)
-    sys::Memory::InvalidateInstructionCache(Block.base(),
-                                            Block.allocatedSize());
-}
-
-SectionMemoryManager::~SectionMemoryManager() {
-  for (MemoryGroup *Group : {&CodeMem, &RWDataMem, &RODataMem}) {
-    for (sys::MemoryBlock &Block : Group->AllocatedMem)
-      MMapper.releaseMappedMemory(Block);
-  }
-}
-
-SectionMemoryManager::MemoryMapper::~MemoryMapper() {}
-
-void SectionMemoryManager::anchor() {}
-
-namespace {
-// Trivial implementation of SectionMemoryManager::MemoryMapper that just calls
-// into sys::Memory.
-class DefaultMMapper final : public SectionMemoryManager::MemoryMapper {
-public:
-  sys::MemoryBlock
-  allocateMappedMemory(SectionMemoryManager::AllocationPurpose Purpose,
-                       size_t NumBytes, const sys::MemoryBlock *const NearBlock,
-                       unsigned Flags, std::error_code &EC) override {
-    return sys::Memory::allocateMappedMemory(NumBytes, NearBlock, Flags, EC);
-  }
-
-  std::error_code protectMappedMemory(const sys::MemoryBlock &Block,
-                                      unsigned Flags) override {
-    return sys::Memory::protectMappedMemory(Block, Flags);
-  }
-
-  std::error_code releaseMappedMemory(sys::MemoryBlock &M) override {
-    return sys::Memory::releaseMappedMemory(M);
-  }
-};
-
-DefaultMMapper DefaultMMapperInstance;
-} // namespace
-
-SectionMemoryManager::SectionMemoryManager(MemoryMapper *MM)
-    : MMapper(MM ? *MM : DefaultMMapperInstance) {}
-
-} // namespace llvm