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📁 ..
📄 ABIInfo.h(5.01 KB)
📄 Address.h(3.28 KB)
📄 BackendUtil.cpp(67.92 KB)
📄 CGAtomic.cpp(85.95 KB)
📄 CGBlocks.cpp(111.14 KB)
📄 CGBlocks.h(8.94 KB)
📄 CGBuilder.h(13.78 KB)
📄 CGBuiltin.cpp(695.8 KB)
📄 CGCUDANV.cpp(35.16 KB)
📄 CGCUDARuntime.cpp(1.53 KB)
📄 CGCUDARuntime.h(3.4 KB)
📄 CGCXX.cpp(11.8 KB)
📄 CGCXXABI.cpp(12.47 KB)
📄 CGCXXABI.h(27.9 KB)
📄 CGCall.cpp(197.3 KB)
📄 CGCall.h(11.62 KB)
📄 CGClass.cpp(113.54 KB)
📄 CGCleanup.cpp(46.97 KB)
📄 CGCleanup.h(19.28 KB)
📄 CGCoroutine.cpp(27.82 KB)
📄 CGDebugInfo.cpp(191.42 KB)
📄 CGDebugInfo.h(34.73 KB)
📄 CGDecl.cpp(97.98 KB)
📄 CGDeclCXX.cpp(34.73 KB)
📄 CGException.cpp(80.38 KB)
📄 CGExpr.cpp(209.78 KB)
📄 CGExprAgg.cpp(77.04 KB)
📄 CGExprCXX.cpp(90.39 KB)
📄 CGExprComplex.cpp(44.9 KB)
📄 CGExprConstant.cpp(86.17 KB)
📄 CGExprScalar.cpp(196.29 KB)
📄 CGGPUBuiltin.cpp(6.17 KB)
📄 CGLoopInfo.cpp(29.17 KB)
📄 CGLoopInfo.h(10.5 KB)
📄 CGNonTrivialStruct.cpp(41.4 KB)
📄 CGObjC.cpp(142.79 KB)
📄 CGObjCGNU.cpp(168.38 KB)
📄 CGObjCMac.cpp(304.84 KB)
📄 CGObjCRuntime.cpp(14.68 KB)
📄 CGObjCRuntime.h(14.81 KB)
📄 CGOpenCLRuntime.cpp(7.08 KB)
📄 CGOpenCLRuntime.h(3.44 KB)
📄 CGOpenMPRuntime.cpp(501.86 KB)
📄 CGOpenMPRuntime.h(111.87 KB)
📄 CGOpenMPRuntimeNVPTX.cpp(215.42 KB)
📄 CGOpenMPRuntimeNVPTX.h(22.59 KB)
📄 CGRecordLayout.h(7.84 KB)
📄 CGRecordLayoutBuilder.cpp(38.24 KB)
📄 CGStmt.cpp(92.92 KB)
📄 CGStmtOpenMP.cpp(278.04 KB)
📄 CGVTT.cpp(6.81 KB)
📄 CGVTables.cpp(55.02 KB)
📄 CGVTables.h(6.38 KB)
📄 CGValue.h(21.24 KB)
📄 CodeGenABITypes.cpp(5 KB)
📄 CodeGenAction.cpp(46.2 KB)
📄 CodeGenFunction.cpp(95.34 KB)
📄 CodeGenFunction.h(200.94 KB)
📄 CodeGenModule.cpp(228.13 KB)
📄 CodeGenModule.h(60.91 KB)
📄 CodeGenPGO.cpp(36.17 KB)
📄 CodeGenPGO.h(4.36 KB)
📄 CodeGenTBAA.cpp(16.92 KB)
📄 CodeGenTBAA.h(9.19 KB)
📄 CodeGenTypeCache.h(3.28 KB)
📄 CodeGenTypes.cpp(32.35 KB)
📄 CodeGenTypes.h(13.42 KB)
📄 ConstantEmitter.h(6.65 KB)
📄 ConstantInitBuilder.cpp(10.29 KB)
📄 CoverageMappingGen.cpp(54.64 KB)
📄 CoverageMappingGen.h(4.04 KB)
📄 EHScopeStack.h(14.38 KB)
📄 ItaniumCXXABI.cpp(176.66 KB)
📄 MacroPPCallbacks.cpp(6.41 KB)
📄 MacroPPCallbacks.h(4.54 KB)
📄 MicrosoftCXXABI.cpp(175.41 KB)
📄 ModuleBuilder.cpp(11.79 KB)
📄 ObjectFilePCHContainerOperations.cpp(12.93 KB)
📄 PatternInit.cpp(4.1 KB)
📄 PatternInit.h(722 B)
📄 SanitizerMetadata.cpp(4.21 KB)
📄 SanitizerMetadata.h(1.63 KB)
📄 SwiftCallingConv.cpp(29.76 KB)
📄 TargetInfo.cpp(403.11 KB)
📄 TargetInfo.h(15.43 KB)
📄 VarBypassDetector.cpp(5.1 KB)
📄 VarBypassDetector.h(2.29 KB)

Editing: ConstantInitBuilder.cpp

//===--- ConstantInitBuilder.cpp - Global initializer builder -------------===//
//
// 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 defines out-of-line routines for building initializers for
// global variables, in particular the kind of globals that are implicitly
// introduced by various language ABIs.
//
//===----------------------------------------------------------------------===//

#include "clang/CodeGen/ConstantInitBuilder.h"
#include "CodeGenModule.h"

using namespace clang;
using namespace CodeGen;

llvm::Type *ConstantInitFuture::getType() const {
  assert(Data && "dereferencing null future");
  if (Data.is<llvm::Constant*>()) {
    return Data.get<llvm::Constant*>()->getType();
  } else {
    return Data.get<ConstantInitBuilderBase*>()->Buffer[0]->getType();
  }
}

void ConstantInitFuture::abandon() {
  assert(Data && "abandoning null future");
  if (auto builder = Data.dyn_cast<ConstantInitBuilderBase*>()) {
    builder->abandon(0);
  }
  Data = nullptr;
}

void ConstantInitFuture::installInGlobal(llvm::GlobalVariable *GV) {
  assert(Data && "installing null future");
  if (Data.is<llvm::Constant*>()) {
    GV->setInitializer(Data.get<llvm::Constant*>());
  } else {
    auto &builder = *Data.get<ConstantInitBuilderBase*>();
    assert(builder.Buffer.size() == 1);
    builder.setGlobalInitializer(GV, builder.Buffer[0]);
    builder.Buffer.clear();
    Data = nullptr;
  }
}

ConstantInitFuture
ConstantInitBuilderBase::createFuture(llvm::Constant *initializer) {
  assert(Buffer.empty() && "buffer not current empty");
  Buffer.push_back(initializer);
  return ConstantInitFuture(this);
}

// Only used in this file.
inline ConstantInitFuture::ConstantInitFuture(ConstantInitBuilderBase *builder)
    : Data(builder) {
  assert(!builder->Frozen);
  assert(builder->Buffer.size() == 1);
  assert(builder->Buffer[0] != nullptr);
}

llvm::GlobalVariable *
ConstantInitBuilderBase::createGlobal(llvm::Constant *initializer,
                                      const llvm::Twine &name,
                                      CharUnits alignment,
                                      bool constant,
                                      llvm::GlobalValue::LinkageTypes linkage,
                                      unsigned addressSpace) {
  auto GV = new llvm::GlobalVariable(CGM.getModule(),
                                     initializer->getType(),
                                     constant,
                                     linkage,
                                     initializer,
                                     name,
                                     /*insert before*/ nullptr,
                                     llvm::GlobalValue::NotThreadLocal,
                                     addressSpace);
  GV->setAlignment(alignment.getAsAlign());
  resolveSelfReferences(GV);
  return GV;
}

void ConstantInitBuilderBase::setGlobalInitializer(llvm::GlobalVariable *GV,
                                                   llvm::Constant *initializer){
  GV->setInitializer(initializer);

if (!SelfReferences.empty())
    resolveSelfReferences(GV);
}

void ConstantInitBuilderBase::resolveSelfReferences(llvm::GlobalVariable *GV) {
  for (auto &entry : SelfReferences) {
    llvm::Constant *resolvedReference =
      llvm::ConstantExpr::getInBoundsGetElementPtr(
        GV->getValueType(), GV, entry.Indices);
    auto dummy = entry.Dummy;
    dummy->replaceAllUsesWith(resolvedReference);
    dummy->eraseFromParent();
  }
  SelfReferences.clear();
}

void ConstantInitBuilderBase::abandon(size_t newEnd) {
  // Remove all the entries we've added.
  Buffer.erase(Buffer.begin() + newEnd, Buffer.end());

// If we're abandoning all the way to the beginning, destroy
  // all the self-references, because we might not get another
  // opportunity.
  if (newEnd == 0) {
    for (auto &entry : SelfReferences) {
      auto dummy = entry.Dummy;
      dummy->replaceAllUsesWith(llvm::UndefValue::get(dummy->getType()));
      dummy->eraseFromParent();
    }
    SelfReferences.clear();
  }
}

void ConstantAggregateBuilderBase::addSize(CharUnits size) {
  add(Builder.CGM.getSize(size));
}

llvm::Constant *
ConstantAggregateBuilderBase::getRelativeOffset(llvm::IntegerType *offsetType,
                                                llvm::Constant *target) {
  return getRelativeOffsetToPosition(offsetType, target,
                                     Builder.Buffer.size() - Begin);
}

llvm::Constant *ConstantAggregateBuilderBase::getRelativeOffsetToPosition(
    llvm::IntegerType *offsetType, llvm::Constant *target, size_t position) {
  // Compute the address of the relative-address slot.
  auto base = getAddrOfPosition(offsetType, position);

// Subtract.
  base = llvm::ConstantExpr::getPtrToInt(base, Builder.CGM.IntPtrTy);
  target = llvm::ConstantExpr::getPtrToInt(target, Builder.CGM.IntPtrTy);
  llvm::Constant *offset = llvm::ConstantExpr::getSub(target, base);

// Truncate to the relative-address type if necessary.
  if (Builder.CGM.IntPtrTy != offsetType) {
    offset = llvm::ConstantExpr::getTrunc(offset, offsetType);
  }

return offset;
}

llvm::Constant *
ConstantAggregateBuilderBase::getAddrOfPosition(llvm::Type *type,
                                                size_t position) {
  // Make a global variable.  We will replace this with a GEP to this
  // position after installing the initializer.
  auto dummy = new llvm::GlobalVariable(Builder.CGM.getModule(), type, true,
                                        llvm::GlobalVariable::PrivateLinkage,
                                        nullptr, "");
  Builder.SelfReferences.emplace_back(dummy);
  auto &entry = Builder.SelfReferences.back();
  (void)getGEPIndicesTo(entry.Indices, position + Begin);
  return dummy;
}

llvm::Constant *
ConstantAggregateBuilderBase::getAddrOfCurrentPosition(llvm::Type *type) {
  // Make a global variable.  We will replace this with a GEP to this
  // position after installing the initializer.
  auto dummy =
    new llvm::GlobalVariable(Builder.CGM.getModule(), type, true,
                             llvm::GlobalVariable::PrivateLinkage,
                             nullptr, "");
  Builder.SelfReferences.emplace_back(dummy);
  auto &entry = Builder.SelfReferences.back();
  (void) getGEPIndicesToCurrentPosition(entry.Indices);
  return dummy;
}

void ConstantAggregateBuilderBase::getGEPIndicesTo(
                               llvm::SmallVectorImpl<llvm::Constant*> &indices,
                               size_t position) const {
  // Recurse on the parent builder if present.
  if (Parent) {
    Parent->getGEPIndicesTo(indices, Begin);

// Otherwise, add an index to drill into the first level of pointer.
  } else {
    assert(indices.empty());
    indices.push_back(llvm::ConstantInt::get(Builder.CGM.Int32Ty, 0));
  }

assert(position >= Begin);
  // We have to use i32 here because struct GEPs demand i32 indices.
  // It's rather unlikely to matter in practice.
  indices.push_back(llvm::ConstantInt::get(Builder.CGM.Int32Ty,
                                           position - Begin));
}

ConstantAggregateBuilderBase::PlaceholderPosition
ConstantAggregateBuilderBase::addPlaceholderWithSize(llvm::Type *type) {
  // Bring the offset up to the last field.
  CharUnits offset = getNextOffsetFromGlobal();

// Create the placeholder.
  auto position = addPlaceholder();

// Advance the offset past that field.
  auto &layout = Builder.CGM.getDataLayout();
  if (!Packed)
    offset = offset.alignTo(CharUnits::fromQuantity(
                                layout.getABITypeAlignment(type)));
  offset += CharUnits::fromQuantity(layout.getTypeStoreSize(type));

CachedOffsetEnd = Builder.Buffer.size();
  CachedOffsetFromGlobal = offset;

return position;
}

CharUnits ConstantAggregateBuilderBase::getOffsetFromGlobalTo(size_t end) const{
  size_t cacheEnd = CachedOffsetEnd;
  assert(cacheEnd <= end);

// Fast path: if the cache is valid, just use it.
  if (cacheEnd == end) {
    return CachedOffsetFromGlobal;
  }

// If the cached range ends before the index at which the current
  // aggregate starts, recurse for the parent.
  CharUnits offset;
  if (cacheEnd < Begin) {
    assert(cacheEnd == 0);
    assert(Parent && "Begin != 0 for root builder");
    cacheEnd = Begin;
    offset = Parent->getOffsetFromGlobalTo(Begin);
  } else {
    offset = CachedOffsetFromGlobal;
  }

// Perform simple layout on the elements in cacheEnd..<end.
  if (cacheEnd != end) {
    auto &layout = Builder.CGM.getDataLayout();
    do {
      llvm::Constant *element = Builder.Buffer[cacheEnd];
      assert(element != nullptr &&
             "cannot compute offset when a placeholder is present");
      llvm::Type *elementType = element->getType();
      if (!Packed)
        offset = offset.alignTo(CharUnits::fromQuantity(
                                  layout.getABITypeAlignment(elementType)));
      offset += CharUnits::fromQuantity(layout.getTypeStoreSize(elementType));
    } while (++cacheEnd != end);
  }

// Cache and return.
  CachedOffsetEnd = cacheEnd;
  CachedOffsetFromGlobal = offset;
  return offset;
}

llvm::Constant *ConstantAggregateBuilderBase::finishArray(llvm::Type *eltTy) {
  markFinished();

auto &buffer = getBuffer();
  assert((Begin < buffer.size() ||
          (Begin == buffer.size() && eltTy))
         && "didn't add any array elements without element type");
  auto elts = llvm::makeArrayRef(buffer).slice(Begin);
  if (!eltTy) eltTy = elts[0]->getType();
  auto type = llvm::ArrayType::get(eltTy, elts.size());
  auto constant = llvm::ConstantArray::get(type, elts);
  buffer.erase(buffer.begin() + Begin, buffer.end());
  return constant;
}

llvm::Constant *
ConstantAggregateBuilderBase::finishStruct(llvm::StructType *ty) {
  markFinished();

auto &buffer = getBuffer();
  auto elts = llvm::makeArrayRef(buffer).slice(Begin);

if (ty == nullptr && elts.empty())
    ty = llvm::StructType::get(Builder.CGM.getLLVMContext(), {}, Packed);

llvm::Constant *constant;
  if (ty) {
    assert(ty->isPacked() == Packed);
    constant = llvm::ConstantStruct::get(ty, elts);
  } else {
    constant = llvm::ConstantStruct::getAnon(elts, Packed);
  }

buffer.erase(buffer.begin() + Begin, buffer.end());
  return constant;
}

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Editing: ConstantInitBuilder.cpp

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