static void build_module_ref(std::string moduleMangle,
llvm::Constant *thisModuleInfo) {
// Build the ModuleInfo reference and bracketing symbols.
llvm::Type *const moduleInfoPtrTy = DtoPtrToType(Module::moduleinfo->type);
std::string thismrefname = "_D";
thismrefname += moduleMangle;
thismrefname += "11__moduleRefZ";
auto thismref = new llvm::GlobalVariable(
gIR->module, moduleInfoPtrTy,
false, // FIXME: mRelocModel != llvm::Reloc::PIC_
llvm::GlobalValue::LinkOnceODRLinkage,
DtoBitCast(thisModuleInfo, moduleInfoPtrTy), thismrefname);
thismref->setSection(".minfo");
gIR->usedArray.push_back(thismref);
}
// helper function that returns the static default initializer of a variable
LLConstant* get_default_initializer(VarDeclaration* vd, Initializer* init)
{
if (init)
{
return DtoConstInitializer(init->loc, vd->type, init);
}
if (vd->init)
{
return DtoConstInitializer(vd->init->loc, vd->type, vd->init);
}
if (vd->type->size(vd->loc) == 0)
{
// We need to be able to handle void[0] struct members even if void has
// no default initializer.
return llvm::ConstantPointerNull::get(DtoPtrToType(vd->type));
}
return DtoConstExpInit(vd->loc, vd->type, vd->type->defaultInit(vd->loc));
}
DValue *DtoAAIndex(Loc &loc, Type *type, DValue *aa, DValue *key, bool lvalue) {
// D2:
// call:
// extern(C) void* _aaGetY(AA* aa, TypeInfo aati, size_t valuesize, void*
// pkey)
// or
// extern(C) void* _aaInX(AA aa*, TypeInfo keyti, void* pkey)
// first get the runtime function
llvm::Function *func = getRuntimeFunction(
loc, gIR->module, lvalue ? "_aaGetY" : "_aaInX");
LLFunctionType *funcTy = func->getFunctionType();
// aa param
LLValue *aaval = lvalue ? aa->getLVal() : aa->getRVal();
aaval = DtoBitCast(aaval, funcTy->getParamType(0));
// pkey param
LLValue *pkey = makeLValue(loc, key);
pkey = DtoBitCast(pkey, funcTy->getParamType(lvalue ? 3 : 2));
// call runtime
LLValue *ret;
if (lvalue) {
LLValue *rawAATI =
DtoTypeInfoOf(aa->type->unSharedOf()->mutableOf(), false);
LLValue *castedAATI = DtoBitCast(rawAATI, funcTy->getParamType(1));
LLValue *valsize = DtoConstSize_t(getTypePaddedSize(DtoType(type)));
ret = gIR->CreateCallOrInvoke(func, aaval, castedAATI, valsize, pkey,
"aa.index")
.getInstruction();
} else {
LLValue *keyti = DtoBitCast(to_keyti(aa), funcTy->getParamType(1));
ret = gIR->CreateCallOrInvoke(func, aaval, keyti, pkey, "aa.index")
.getInstruction();
}
// cast return value
LLType *targettype = DtoPtrToType(type);
if (ret->getType() != targettype) {
ret = DtoBitCast(ret, targettype);
}
// Only check bounds for rvalues ('aa[key]').
// Lvalue use ('aa[key] = value') auto-adds an element.
if (!lvalue && gIR->emitArrayBoundsChecks()) {
llvm::BasicBlock *failbb = llvm::BasicBlock::Create(
gIR->context(), "aaboundscheckfail", gIR->topfunc());
llvm::BasicBlock *okbb =
llvm::BasicBlock::Create(gIR->context(), "aaboundsok", gIR->topfunc());
LLValue *nullaa = LLConstant::getNullValue(ret->getType());
LLValue *cond = gIR->ir->CreateICmpNE(nullaa, ret, "aaboundscheck");
gIR->ir->CreateCondBr(cond, okbb, failbb);
// set up failbb to call the array bounds error runtime function
gIR->scope() = IRScope(failbb);
llvm::Function *errorfn =
getRuntimeFunction(loc, gIR->module, "_d_arraybounds");
gIR->CreateCallOrInvoke(
errorfn, DtoModuleFileName(gIR->func()->decl->getModule(), loc),
DtoConstUint(loc.linnum));
// the function does not return
gIR->ir->CreateUnreachable();
// if ok, proceed in okbb
gIR->scope() = IRScope(okbb);
}
return new DVarValue(type, ret);
}
DValue *DtoNestedVariable(Loc &loc, Type *astype, VarDeclaration *vd,
bool byref) {
IF_LOG Logger::println("DtoNestedVariable for %s @ %s", vd->toChars(),
loc.toChars());
LOG_SCOPE;
////////////////////////////////////
// Locate context value
Dsymbol *vdparent = vd->toParent2();
assert(vdparent);
IrFunction *irfunc = gIR->func();
// Check whether we can access the needed frame
FuncDeclaration *fd = irfunc->decl;
while (fd && fd != vdparent) {
fd = getParentFunc(fd);
}
if (!fd) {
error(loc, "function `%s` cannot access frame of function `%s`",
irfunc->decl->toPrettyChars(), vdparent->toPrettyChars());
return new DLValue(astype, llvm::UndefValue::get(DtoPtrToType(astype)));
}
// is the nested variable in this scope?
if (vdparent == irfunc->decl) {
return makeVarDValue(astype, vd);
}
// get the nested context
LLValue *ctx = nullptr;
bool skipDIDeclaration = false;
auto currentCtx = gIR->funcGen().nestedVar;
if (currentCtx) {
Logger::println("Using own nested context of current function");
ctx = currentCtx;
} else if (irfunc->decl->isMember2()) {
Logger::println(
"Current function is member of nested class, loading vthis");
AggregateDeclaration *cd = irfunc->decl->isMember2();
LLValue *val = irfunc->thisArg;
if (cd->isClassDeclaration()) {
val = DtoLoad(val);
}
ctx = DtoLoad(DtoGEPi(val, 0, getVthisIdx(cd), ".vthis"));
skipDIDeclaration = true;
} else {
Logger::println("Regular nested function, loading context arg");
ctx = DtoLoad(irfunc->nestArg);
}
assert(ctx);
IF_LOG { Logger::cout() << "Context: " << *ctx << '\n'; }
DtoCreateNestedContextType(vdparent->isFuncDeclaration());
assert(isIrLocalCreated(vd));
////////////////////////////////////
// Extract variable from nested context
const auto frameType = LLPointerType::getUnqual(irfunc->frameType);
IF_LOG { Logger::cout() << "casting to: " << *irfunc->frameType << '\n'; }
LLValue *val = DtoBitCast(ctx, frameType);
IrLocal *const irLocal = getIrLocal(vd);
const auto vardepth = irLocal->nestedDepth;
const auto funcdepth = irfunc->depth;
IF_LOG {
Logger::cout() << "Variable: " << vd->toChars() << '\n';
Logger::cout() << "Variable depth: " << vardepth << '\n';
Logger::cout() << "Function: " << irfunc->decl->toChars() << '\n';
Logger::cout() << "Function depth: " << funcdepth << '\n';
}
if (vardepth == funcdepth) {
// This is not always handled above because functions without
// variables accessed by nested functions don't create new frames.
IF_LOG Logger::println("Same depth");
} else {
// Load frame pointer and index that...
IF_LOG Logger::println("Lower depth");
val = DtoGEPi(val, 0, vardepth);
IF_LOG Logger::cout() << "Frame index: " << *val << '\n';
val = DtoAlignedLoad(
val, (std::string(".frame.") + vdparent->toChars()).c_str());
IF_LOG Logger::cout() << "Frame: " << *val << '\n';
}
const auto idx = irLocal->nestedIndex;
assert(idx != -1 && "Nested context not yet resolved for variable.");
LLSmallVector<int64_t, 2> dwarfAddrOps;
LLValue *gep = DtoGEPi(val, 0, idx, vd->toChars());
val = gep;
IF_LOG {
Logger::cout() << "Addr: " << *val << '\n';
Logger::cout() << "of type: " << *val->getType() << '\n';
}
const bool isRefOrOut = vd->isRef() || vd->isOut();
if (isSpecialRefVar(vd)) {
// Handled appropriately by makeVarDValue() and EmitLocalVariable(), pass
// storage of pointer (reference lvalue).
} else if (byref || isRefOrOut) {
val = DtoAlignedLoad(val);
// ref/out variables get a reference-debuginfo-type in EmitLocalVariable();
// pass the GEP as reference lvalue in that case.
if (!isRefOrOut)
gIR->DBuilder.OpDeref(dwarfAddrOps);
IF_LOG {
Logger::cout() << "Was byref, now: " << *irLocal->value << '\n';
Logger::cout() << "of type: " << *irLocal->value->getType() << '\n';
}
}
LLType *type(Type *dty, LLType *t) override { return DtoPtrToType(dty); }
static void build_dso_registry_calls(std::string moduleMangle,
llvm::Constant *thisModuleInfo) {
// Build the ModuleInfo reference and bracketing symbols.
llvm::Type *const moduleInfoPtrTy = DtoPtrToType(Module::moduleinfo->type);
// Order is important here: We must create the symbols in the
// bracketing sections right before/after the ModuleInfo reference
// so that they end up in the correct order in the object file.
auto minfoBeg =
new llvm::GlobalVariable(gIR->module, moduleInfoPtrTy,
false, // FIXME: mRelocModel != llvm::Reloc::PIC_
llvm::GlobalValue::LinkOnceODRLinkage,
getNullPtr(moduleInfoPtrTy), "_minfo_beg");
minfoBeg->setSection(".minfo_beg");
minfoBeg->setVisibility(llvm::GlobalValue::HiddenVisibility);
std::string thismrefname = "_D";
thismrefname += moduleMangle;
thismrefname += "11__moduleRefZ";
auto thismref = new llvm::GlobalVariable(
gIR->module, moduleInfoPtrTy,
false, // FIXME: mRelocModel != llvm::Reloc::PIC_
llvm::GlobalValue::LinkOnceODRLinkage,
DtoBitCast(thisModuleInfo, moduleInfoPtrTy), thismrefname);
thismref->setSection(".minfo");
gIR->usedArray.push_back(thismref);
auto minfoEnd =
new llvm::GlobalVariable(gIR->module, moduleInfoPtrTy,
false, // FIXME: mRelocModel != llvm::Reloc::PIC_
llvm::GlobalValue::LinkOnceODRLinkage,
getNullPtr(moduleInfoPtrTy), "_minfo_end");
minfoEnd->setSection(".minfo_end");
minfoEnd->setVisibility(llvm::GlobalValue::HiddenVisibility);
// Build the ctor to invoke _d_dso_registry.
// This is the DSO slot for use by the druntime implementation.
auto dsoSlot =
new llvm::GlobalVariable(gIR->module, getVoidPtrType(), false,
llvm::GlobalValue::LinkOnceODRLinkage,
getNullPtr(getVoidPtrType()), "ldc.dso_slot");
dsoSlot->setVisibility(llvm::GlobalValue::HiddenVisibility);
// Okay, so the theory is easy: We want to have one global constructor and
// destructor per object (i.e. executable/shared library) that calls
// _d_dso_registry with the respective DSO record. However, there are a
// couple of issues that make this harder than necessary:
//
// 1) The natural way to implement the "one-per-image" part would be to
// emit a weak reference to a weak function into a .ctors.<somename>
// section (llvm.global_ctors doesn't support the necessary
// functionality, so we'd use our knowledge of the linker script to work
// around that). But as of LLVM 3.4, emitting a symbol both as weak and
// into a custom section is not supported by the MC layer. Thus, we have
// to use a normal ctor/dtor and manually ensure that we only perform
// the call once. This is done by introducing ldc.dso_initialized.
//
// 2) To make sure the .minfo section isn't removed by the linker when
// using --gc-sections, we need to keep a reference to it around in
// _every_ object file (as --gc-sections works per object file). The
// natural place for this is the ctor, where we just load a reference
// on the stack after the DSO record (to ensure LLVM doesn't optimize
// it out). However, this way, we need to have at least one ctor
// instance per object file be pulled into the final executable. We
// do this here by making the module mangle string part of its name,
// even thoguht this is slightly wasteful on -singleobj builds.
//
// It might be a better idea to simply use a custom linker script (using
// INSERT AFTER… so as to still keep the default one) to avoid all these
// problems. This would mean that it is no longer safe to link D objects
// directly using e.g. "g++ dcode.o cppcode.o", though.
auto dsoInitialized = new llvm::GlobalVariable(
gIR->module, llvm::Type::getInt8Ty(gIR->context()), false,
llvm::GlobalValue::LinkOnceODRLinkage,
llvm::ConstantInt::get(llvm::Type::getInt8Ty(gIR->context()), 0),
"ldc.dso_initialized");
dsoInitialized->setVisibility(llvm::GlobalValue::HiddenVisibility);
// There is no reason for this cast to void*, other than that removing it
// seems to trigger a bug in the llvm::Linker (at least on LLVM 3.4)
// causing it to not merge the %object.ModuleInfo types properly. This
// manifests itself in a type mismatch assertion being triggered on the
// minfoUsedPointer store in the ctor as soon as the optimizer runs.
llvm::Value *minfoRefPtr = DtoBitCast(thismref, getVoidPtrType());
std::string ctorName = "ldc.dso_ctor.";
ctorName += moduleMangle;
llvm::Function *dsoCtor = llvm::Function::Create(
llvm::FunctionType::get(llvm::Type::getVoidTy(gIR->context()), false),
llvm::GlobalValue::LinkOnceODRLinkage, ctorName, &gIR->module);
dsoCtor->setVisibility(llvm::GlobalValue::HiddenVisibility);
build_dso_ctor_dtor_body(dsoCtor, dsoInitialized, dsoSlot, minfoBeg, minfoEnd,
minfoRefPtr, false);
llvm::appendToGlobalCtors(gIR->module, dsoCtor, 65535);
std::string dtorName = "ldc.dso_dtor.";
dtorName += moduleMangle;
llvm::Function *dsoDtor = llvm::Function::Create(
llvm::FunctionType::get(llvm::Type::getVoidTy(gIR->context()), false),
llvm::GlobalValue::LinkOnceODRLinkage, dtorName, &gIR->module);
dsoDtor->setVisibility(llvm::GlobalValue::HiddenVisibility);
build_dso_ctor_dtor_body(dsoDtor, dsoInitialized, dsoSlot, minfoBeg, minfoEnd,
minfoRefPtr, true);
llvm::appendToGlobalDtors(gIR->module, dsoDtor, 65535);
}
LLType* type(Type* dty, LLType* t) {
return DtoPtrToType(dty);
}
DSpecialRefValue::DSpecialRefValue(Type *t, LLValue *v) : DLValue(v, t) {
assert(v->getType() == DtoPtrToType(t)->getPointerTo());
}
DLValue::DLValue(Type *t, LLValue *v) : DValue(t, v) {
// v may be an addrspace qualified pointer so strip it before doing a pointer
// equality check.
assert(t->toBasetype()->ty == Ttuple ||
stripAddrSpaces(v->getType()) == DtoPtrToType(t));
}
LLType *type(Type *t) override { return DtoPtrToType(t); }