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//===-- ms-cxx-helper.cpp -------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/ms-cxx-helper.h"
#include "dmd/target.h"
#include "gen/irstate.h"
#include "gen/llvm.h"
#include "gen/llvmhelpers.h"
#include "gen/mangling.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/CFG.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/Cloning.h"
llvm::BasicBlock *getUnwindDest(llvm::Instruction *I) {
if (auto II = llvm::dyn_cast<llvm::InvokeInst>(I))
return II->getUnwindDest();
if (auto CSI = llvm::dyn_cast<llvm::CatchSwitchInst>(I))
return CSI->getUnwindDest();
if (auto CRPI = llvm::dyn_cast<llvm::CleanupReturnInst>(I))
return CRPI->getUnwindDest();
return nullptr;
}
// return all basic blocks that are reachable from bb, but don't pass through
// ebb and don't follow unwinding target
void findSuccessors(std::vector<llvm::BasicBlock *> &blocks,
llvm::BasicBlock *bb, llvm::BasicBlock *ebb) {
blocks.push_back(bb);
if (bb != ebb) {
assert(bb->getTerminator());
for (size_t pos = 0; pos < blocks.size(); ++pos) {
bb = blocks[pos];
if (auto term = bb->getTerminator()) {
llvm::BasicBlock *unwindDest = getUnwindDest(term);
unsigned cnt = term->getNumSuccessors();
for (unsigned s = 0; s < cnt; s++) {
llvm::BasicBlock *succ = term->getSuccessor(s);
if (succ != ebb && succ != unwindDest &&
std::find(blocks.begin(), blocks.end(), succ) == blocks.end()) {
blocks.push_back(succ);
}
}
}
}
blocks.push_back(ebb);
}
}
// remap values in all instructions of all blocks
void remapBlocks(std::vector<llvm::BasicBlock *> &blocks,
llvm::ValueToValueMapTy &VMap) {
for (llvm::BasicBlock *bb : blocks)
for (auto &I : *bb) {
llvm::RemapInstruction(&I, VMap,
llvm::RF_IgnoreMissingLocals |
llvm::RF_NoModuleLevelChanges);
}
}
void remapBlocksValue(std::vector<llvm::BasicBlock *> &blocks,
llvm::Value *from, llvm::Value *to) {
llvm::ValueToValueMapTy VMap;
VMap[from] = to;
remapBlocks(blocks, VMap);
}
// make a copy of all blocks and instructions in srcblocks
// - map values to clones
// - redirect srcTarget to continueWith
// - set "funclet" attribute inside catch/cleanup pads
// - inside funclets, replace "unreachable" with "branch cleanupret"
void cloneBlocks(const std::vector<llvm::BasicBlock *> &srcblocks,
std::vector<llvm::BasicBlock *> &blocks,
llvm::BasicBlock *continueWith, llvm::BasicBlock *unwindTo,
llvm::Value *funclet) {
llvm::ValueToValueMapTy VMap;
// map the terminal branch to the new target
if (continueWith)
if (auto term = srcblocks.back()->getTerminator())
if (auto succ = term->getSuccessor(0))
VMap[succ] = continueWith;
for (auto bb : srcblocks) {
llvm::Function *F = bb->getParent();
auto nbb = llvm::BasicBlock::Create(bb->getContext(), bb->getName());
// Loop over all instructions, and copy them over.
for (auto &II : *bb) {
llvm::Instruction *Inst = &II;
llvm::Instruction *newInst = nullptr;
if (funclet &&
!llvm::isa<llvm::DbgInfoIntrinsic>(Inst)) { // IntrinsicInst?
if (auto IInst = llvm::dyn_cast<llvm::InvokeInst>(Inst)) {
auto invoke = llvm::InvokeInst::Create(
IInst, llvm::OperandBundleDef("funclet", funclet));
newInst = invoke;
} else if (auto CInst = llvm::dyn_cast<llvm::CallInst>(Inst)) {
auto call = llvm::CallInst::Create(
CInst, llvm::OperandBundleDef("funclet", funclet));
newInst = call;
} else if (funclet && llvm::isa<llvm::UnreachableInst>(Inst)) {
newInst = llvm::BranchInst::Create(continueWith); // to cleanupret
}
}
if (!newInst)
newInst = Inst->clone();
nbb->getInstList().push_back(newInst);
VMap[Inst] = newInst; // Add instruction map to value.
if (unwindTo)
if (auto dest = getUnwindDest(Inst))
VMap[dest] = unwindTo;
}
nbb->insertInto(F, continueWith);
VMap[bb] = nbb;
blocks.push_back(nbb);
}
remapBlocks(blocks, VMap);
}
bool isCatchSwitchBlock(llvm::BasicBlock *bb) {
if (bb->empty())
return false;
return llvm::dyn_cast<llvm::CatchSwitchInst>(&bb->front());
}
// copy from clang/.../MicrosoftCXXABI.cpp
// routines for constructing the llvm types for MS RTTI structs.
llvm::StructType *getTypeDescriptorType(IRState &irs,
llvm::Constant *classInfoPtr,
llvm::StringRef TypeInfoString) {
llvm::SmallString<256> TDTypeName("rtti.TypeDescriptor");
TDTypeName += llvm::utostr(TypeInfoString.size());
llvm::StructType *&TypeDescriptorType =
irs.TypeDescriptorTypeMap[TypeInfoString.size()];
if (TypeDescriptorType)
return TypeDescriptorType;
auto int8Ty = LLType::getInt8Ty(gIR->context());
llvm::Type *FieldTypes[] = {
classInfoPtr->getType(), // CGM.Int8PtrPtrTy,
getPtrToType(int8Ty), // CGM.Int8PtrTy,
llvm::ArrayType::get(int8Ty, TypeInfoString.size() + 1)};
TypeDescriptorType =
llvm::StructType::create(gIR->context(), FieldTypes, TDTypeName);
return TypeDescriptorType;
}
llvm::GlobalVariable *getTypeDescriptor(IRState &irs, ClassDeclaration *cd) {
if (cd->isCPPclass()) {
const char *name = target.cpp.typeInfoMangle(cd);
return declareGlobal(cd->loc, irs.module, getVoidPtrType(), name,
/*isConstant*/ true, false,
/*useDLLImport*/ cd->isExport());
}
llvm::GlobalVariable *&Var = irs.TypeDescriptorMap[cd];
if (Var)
return Var;
auto classInfoPtr = getIrAggr(cd, true)->getClassInfoSymbol();
// The type name must match the expectation in druntime's ldc.eh_msvc - the
// TypeInfo_Class name with a 'D' prefix (the first character is skipped in
// debugger output).
const auto TypeNameString =
(llvm::Twine("D") + cd->toPrettyChars(/*QualifyTypes=*/true)).str();
const auto TypeDescName = getIRMangledAggregateName(cd, "@TypeDescriptor");
// Declare and initialize the TypeDescriptor.
llvm::Constant *Fields[] = {
classInfoPtr, // VFPtr
llvm::ConstantPointerNull::get(
LLType::getInt8PtrTy(gIR->context())), // Runtime data
llvm::ConstantDataArray::getString(gIR->context(), TypeNameString)};
llvm::StructType *TypeDescriptorType =
getTypeDescriptorType(irs, classInfoPtr, TypeNameString);
const LinkageWithCOMDAT lwc = {LLGlobalVariable::LinkOnceODRLinkage, true};
Var = defineGlobal(cd->loc, gIR->module, TypeDescName,
llvm::ConstantStruct::get(TypeDescriptorType, Fields),
lwc.first, /*isConstant=*/true);
setLinkage(lwc, Var);
return Var;
}
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