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CIRGenExpr.cpp
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//===--- CIRGenExpr.cpp - Emit LLVM Code from Expressions -----------------===//
//
// 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 contains code to emit Expr nodes as CIR code.
//
//===----------------------------------------------------------------------===//
#include "CIRGenBuilder.h"
#include "CIRGenCXXABI.h"
#include "CIRGenCall.h"
#include "CIRGenCstEmitter.h"
#include "CIRGenFunction.h"
#include "CIRGenModule.h"
#include "CIRGenOpenMPRuntime.h"
#include "CIRGenValue.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/GlobalDecl.h"
#include "clang/Basic/Builtins.h"
#include "clang/CIR/Dialect/IR/CIRDialect.h"
#include "clang/CIR/Dialect/IR/CIROpsEnums.h"
#include "clang/CIR/Dialect/IR/CIRTypes.h"
#include "clang/CIR/MissingFeatures.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/ADT/StringExtras.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/Operation.h"
#include "mlir/IR/Value.h"
using namespace cir;
using namespace clang;
using namespace mlir::cir;
static mlir::cir::FuncOp buildFunctionDeclPointer(CIRGenModule &CGM,
GlobalDecl GD) {
const auto *FD = cast<FunctionDecl>(GD.getDecl());
if (FD->hasAttr<WeakRefAttr>()) {
mlir::Operation *aliasee = CGM.getWeakRefReference(FD);
return dyn_cast<FuncOp>(aliasee);
}
auto V = CGM.GetAddrOfFunction(GD);
return V;
}
static Address buildPreserveStructAccess(CIRGenFunction &CGF, LValue base,
Address addr, const FieldDecl *field) {
llvm_unreachable("NYI");
}
/// Get the address of a zero-sized field within a record. The resulting address
/// doesn't necessarily have the right type.
static Address buildAddrOfFieldStorage(CIRGenFunction &CGF, Address Base,
const FieldDecl *field,
llvm::StringRef fieldName,
unsigned fieldIndex) {
if (field->isZeroSize(CGF.getContext()))
llvm_unreachable("NYI");
auto loc = CGF.getLoc(field->getLocation());
auto fieldType = CGF.convertType(field->getType());
auto fieldPtr =
mlir::cir::PointerType::get(CGF.getBuilder().getContext(), fieldType);
// For most cases fieldName is the same as field->getName() but for lambdas,
// which do not currently carry the name, so it can be passed down from the
// CaptureStmt.
auto memberAddr = CGF.getBuilder().createGetMember(
loc, fieldPtr, Base.getPointer(), fieldName, fieldIndex);
// Retrieve layout information, compute alignment and return the final
// address.
const RecordDecl *rec = field->getParent();
auto &layout = CGF.CGM.getTypes().getCIRGenRecordLayout(rec);
unsigned idx = layout.getCIRFieldNo(field);
auto offset = CharUnits::fromQuantity(layout.getCIRType().getElementOffset(
CGF.CGM.getDataLayout().layout, idx));
auto addr =
Address(memberAddr, Base.getAlignment().alignmentAtOffset(offset));
return addr;
}
static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
if (!RD)
return false;
if (RD->isDynamicClass())
return true;
for (const auto &Base : RD->bases())
if (hasAnyVptr(Base.getType(), Context))
return true;
for (const FieldDecl *Field : RD->fields())
if (hasAnyVptr(Field->getType(), Context))
return true;
return false;
}
static Address buildPointerWithAlignment(const Expr *E,
LValueBaseInfo *BaseInfo,
KnownNonNull_t IsKnownNonNull,
CIRGenFunction &CGF) {
// We allow this with ObjC object pointers because of fragile ABIs.
assert(E->getType()->isPointerType() ||
E->getType()->isObjCObjectPointerType());
E = E->IgnoreParens();
// Casts:
if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
CGF.CGM.buildExplicitCastExprType(ECE, &CGF);
switch (CE->getCastKind()) {
default: {
llvm::errs() << CE->getCastKindName() << "\n";
assert(0 && "not implemented");
}
// Non-converting casts (but not C's implicit conversion from void*).
case CK_BitCast:
case CK_NoOp:
case CK_AddressSpaceConversion:
if (auto PtrTy =
CE->getSubExpr()->getType()->getAs<clang::PointerType>()) {
if (PtrTy->getPointeeType()->isVoidType())
break;
assert(!MissingFeatures::tbaa());
LValueBaseInfo InnerBaseInfo;
Address Addr = CGF.buildPointerWithAlignment(
CE->getSubExpr(), &InnerBaseInfo, IsKnownNonNull);
if (BaseInfo)
*BaseInfo = InnerBaseInfo;
if (isa<ExplicitCastExpr>(CE)) {
assert(!MissingFeatures::tbaa());
LValueBaseInfo TargetTypeBaseInfo;
CharUnits Align = CGF.CGM.getNaturalPointeeTypeAlignment(
E->getType(), &TargetTypeBaseInfo);
// If the source l-value is opaque, honor the alignment of the
// casted-to type.
if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
if (BaseInfo)
BaseInfo->mergeForCast(TargetTypeBaseInfo);
Addr = Address(Addr.getPointer(), Addr.getElementType(), Align,
IsKnownNonNull);
}
}
if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
CE->getCastKind() == CK_BitCast) {
if (auto PT = E->getType()->getAs<clang::PointerType>())
llvm_unreachable("NYI");
}
auto ElemTy =
CGF.getTypes().convertTypeForMem(E->getType()->getPointeeType());
Addr = CGF.getBuilder().createElementBitCast(
CGF.getLoc(E->getSourceRange()), Addr, ElemTy);
if (CE->getCastKind() == CK_AddressSpaceConversion) {
assert(!MissingFeatures::addressSpace());
llvm_unreachable("NYI");
}
return Addr;
}
break;
// Nothing to do here...
case CK_LValueToRValue:
case CK_NullToPointer:
case CK_IntegralToPointer:
break;
// Array-to-pointer decay. TODO(cir): BaseInfo and TBAAInfo.
case CK_ArrayToPointerDecay:
return CGF.buildArrayToPointerDecay(CE->getSubExpr());
case CK_UncheckedDerivedToBase:
case CK_DerivedToBase: {
// TODO: Support accesses to members of base classes in TBAA. For now, we
// conservatively pretend that the complete object is of the base class
// type.
assert(!MissingFeatures::tbaa());
Address Addr = CGF.buildPointerWithAlignment(CE->getSubExpr(), BaseInfo);
auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
return CGF.getAddressOfBaseClass(
Addr, Derived, CE->path_begin(), CE->path_end(),
CGF.shouldNullCheckClassCastValue(CE), CE->getExprLoc());
}
}
}
// Unary &.
if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
// TODO(cir): maybe we should use cir.unary for pointers here instead.
if (UO->getOpcode() == UO_AddrOf) {
LValue LV = CGF.buildLValue(UO->getSubExpr());
if (BaseInfo)
*BaseInfo = LV.getBaseInfo();
assert(!MissingFeatures::tbaa());
return LV.getAddress();
}
}
// std::addressof and variants.
if (auto *Call = dyn_cast<CallExpr>(E)) {
switch (Call->getBuiltinCallee()) {
default:
break;
case Builtin::BIaddressof:
case Builtin::BI__addressof:
case Builtin::BI__builtin_addressof: {
llvm_unreachable("NYI");
}
}
}
// TODO: conditional operators, comma.
// Otherwise, use the alignment of the type.
return CGF.makeNaturalAddressForPointer(
CGF.buildScalarExpr(E), E->getType()->getPointeeType(), CharUnits(),
/*ForPointeeType=*/true, BaseInfo, IsKnownNonNull);
}
/// Helper method to check if the underlying ABI is AAPCS
static bool isAAPCS(const TargetInfo &TargetInfo) {
return TargetInfo.getABI().starts_with("aapcs");
}
Address CIRGenFunction::getAddrOfBitFieldStorage(LValue base,
const FieldDecl *field,
mlir::Type fieldType,
unsigned index) {
if (index == 0)
return base.getAddress();
auto loc = getLoc(field->getLocation());
auto fieldPtr =
mlir::cir::PointerType::get(getBuilder().getContext(), fieldType);
auto sea = getBuilder().createGetMember(loc, fieldPtr, base.getPointer(),
field->getName(), index);
return Address(sea, CharUnits::One());
}
static bool useVolatileForBitField(const CIRGenModule &cgm, LValue base,
const CIRGenBitFieldInfo &info,
const FieldDecl *field) {
return isAAPCS(cgm.getTarget()) && cgm.getCodeGenOpts().AAPCSBitfieldWidth &&
info.VolatileStorageSize != 0 &&
field->getType()
.withCVRQualifiers(base.getVRQualifiers())
.isVolatileQualified();
}
LValue CIRGenFunction::buildLValueForBitField(LValue base,
const FieldDecl *field) {
LValueBaseInfo BaseInfo = base.getBaseInfo();
const RecordDecl *rec = field->getParent();
auto &layout = CGM.getTypes().getCIRGenRecordLayout(field->getParent());
auto &info = layout.getBitFieldInfo(field);
auto useVolatile = useVolatileForBitField(CGM, base, info, field);
unsigned Idx = layout.getCIRFieldNo(field);
if (useVolatile ||
(IsInPreservedAIRegion ||
(getDebugInfo() && rec->hasAttr<BPFPreserveAccessIndexAttr>()))) {
llvm_unreachable("NYI");
}
Address Addr = getAddrOfBitFieldStorage(base, field, info.StorageType, Idx);
auto loc = getLoc(field->getLocation());
if (Addr.getElementType() != info.StorageType)
Addr = builder.createElementBitCast(loc, Addr, info.StorageType);
QualType fieldType =
field->getType().withCVRQualifiers(base.getVRQualifiers());
assert(!MissingFeatures::tbaa() && "NYI TBAA for bit fields");
LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
return LValue::MakeBitfield(Addr, info, fieldType, FieldBaseInfo);
}
LValue CIRGenFunction::buildLValueForField(LValue base,
const FieldDecl *field) {
LValueBaseInfo BaseInfo = base.getBaseInfo();
if (field->isBitField())
return buildLValueForBitField(base, field);
// Fields of may-alias structures are may-alais themselves.
// FIXME: this hould get propagated down through anonymous structs and unions.
QualType FieldType = field->getType();
const RecordDecl *rec = field->getParent();
AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
if (MissingFeatures::tbaa() || rec->hasAttr<MayAliasAttr>() ||
FieldType->isVectorType()) {
assert(!MissingFeatures::tbaa() && "NYI");
} else if (rec->isUnion()) {
assert(!MissingFeatures::tbaa() && "NYI");
} else {
// If no base type been assigned for the base access, then try to generate
// one for this base lvalue.
assert(!MissingFeatures::tbaa() && "NYI");
}
Address addr = base.getAddress();
if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
if (CGM.getCodeGenOpts().StrictVTablePointers &&
ClassDef->isDynamicClass()) {
llvm_unreachable("NYI");
}
}
unsigned RecordCVR = base.getVRQualifiers();
if (rec->isUnion()) {
// NOTE(cir): the element to be loaded/stored need to type-match the
// source/destination, so we emit a GetMemberOp here.
llvm::StringRef fieldName = field->getName();
unsigned fieldIndex = field->getFieldIndex();
if (CGM.LambdaFieldToName.count(field))
fieldName = CGM.LambdaFieldToName[field];
addr = buildAddrOfFieldStorage(*this, addr, field, fieldName, fieldIndex);
if (CGM.getCodeGenOpts().StrictVTablePointers &&
hasAnyVptr(FieldType, getContext()))
// Because unions can easily skip invariant.barriers, we need to add
// a barrier every time CXXRecord field with vptr is referenced.
assert(!MissingFeatures::createInvariantGroup());
if (IsInPreservedAIRegion ||
(getDebugInfo() && rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
assert(!MissingFeatures::generateDebugInfo());
}
if (FieldType->isReferenceType())
llvm_unreachable("NYI");
} else {
if (!IsInPreservedAIRegion &&
(!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
llvm::StringRef fieldName = field->getName();
auto &layout = CGM.getTypes().getCIRGenRecordLayout(field->getParent());
unsigned fieldIndex = layout.getCIRFieldNo(field);
if (CGM.LambdaFieldToName.count(field))
fieldName = CGM.LambdaFieldToName[field];
addr = buildAddrOfFieldStorage(*this, addr, field, fieldName, fieldIndex);
} else
// Remember the original struct field index
addr = buildPreserveStructAccess(*this, base, addr, field);
}
// If this is a reference field, load the reference right now.
if (FieldType->isReferenceType()) {
assert(!MissingFeatures::tbaa());
LValue RefLVal = makeAddrLValue(addr, FieldType, FieldBaseInfo);
if (RecordCVR & Qualifiers::Volatile)
RefLVal.getQuals().addVolatile();
addr = buildLoadOfReference(RefLVal, getLoc(field->getSourceRange()),
&FieldBaseInfo);
// Qualifiers on the struct don't apply to the referencee.
RecordCVR = 0;
FieldType = FieldType->getPointeeType();
}
// Make sure that the address is pointing to the right type. This is critical
// for both unions and structs. A union needs a bitcast, a struct element will
// need a bitcast if the CIR type laid out doesn't match the desired type.
// TODO(CIR): CodeGen requires a bitcast here for unions or for structs where
// the LLVM type doesn't match the desired type. No idea when the latter might
// occur, though.
if (field->hasAttr<AnnotateAttr>())
llvm_unreachable("NYI");
if (MissingFeatures::tbaa())
// Next line should take a TBAA object
llvm_unreachable("NYI");
LValue LV = makeAddrLValue(addr, FieldType, FieldBaseInfo);
LV.getQuals().addCVRQualifiers(RecordCVR);
// __weak attribute on a field is ignored.
if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
llvm_unreachable("NYI");
return LV;
}
LValue CIRGenFunction::buildLValueForFieldInitialization(
LValue Base, const clang::FieldDecl *Field, llvm::StringRef FieldName) {
QualType FieldType = Field->getType();
if (!FieldType->isReferenceType())
return buildLValueForField(Base, Field);
auto &layout = CGM.getTypes().getCIRGenRecordLayout(Field->getParent());
unsigned FieldIndex = layout.getCIRFieldNo(Field);
Address V = buildAddrOfFieldStorage(*this, Base.getAddress(), Field,
FieldName, FieldIndex);
// Make sure that the address is pointing to the right type.
auto memTy = getTypes().convertTypeForMem(FieldType);
V = builder.createElementBitCast(getLoc(Field->getSourceRange()), V, memTy);
// TODO: Generate TBAA information that describes this access as a structure
// member access and not just an access to an object of the field's type. This
// should be similar to what we do in EmitLValueForField().
LValueBaseInfo BaseInfo = Base.getBaseInfo();
AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
assert(!MissingFeatures::tbaa() && "NYI");
return makeAddrLValue(V, FieldType, FieldBaseInfo);
}
LValue
CIRGenFunction::buildCompoundLiteralLValue(const CompoundLiteralExpr *E) {
if (E->isFileScope()) {
llvm_unreachable("NYI");
}
if (E->getType()->isVariablyModifiedType()) {
llvm_unreachable("NYI");
}
Address DeclPtr = CreateMemTemp(E->getType(), getLoc(E->getSourceRange()),
".compoundliteral");
const Expr *InitExpr = E->getInitializer();
LValue Result = makeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
buildAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
/*Init*/ true);
// Block-scope compound literals are destroyed at the end of the enclosing
// scope in C.
if (!getLangOpts().CPlusPlus)
if (QualType::DestructionKind DtorKind = E->getType().isDestructedType())
llvm_unreachable("NYI");
return Result;
}
// Detect the unusual situation where an inline version is shadowed by a
// non-inline version. In that case we should pick the external one
// everywhere. That's GCC behavior too.
static bool onlyHasInlineBuiltinDeclaration(const FunctionDecl *FD) {
for (const FunctionDecl *PD = FD; PD; PD = PD->getPreviousDecl())
if (!PD->isInlineBuiltinDeclaration())
return false;
return true;
}
static CIRGenCallee buildDirectCallee(CIRGenModule &CGM, GlobalDecl GD) {
const auto *FD = cast<FunctionDecl>(GD.getDecl());
if (auto builtinID = FD->getBuiltinID()) {
std::string NoBuiltinFD = ("no-builtin-" + FD->getName()).str();
std::string NoBuiltins = "no-builtins";
auto *A = FD->getAttr<AsmLabelAttr>();
StringRef Ident = A ? A->getLabel() : FD->getName();
std::string FDInlineName = (Ident + ".inline").str();
auto &CGF = *CGM.getCurrCIRGenFun();
bool IsPredefinedLibFunction =
CGM.getASTContext().BuiltinInfo.isPredefinedLibFunction(builtinID);
bool HasAttributeNoBuiltin = false;
assert(!MissingFeatures::attributeNoBuiltin() && "NYI");
// bool HasAttributeNoBuiltin =
// CGF.CurFn->getAttributes().hasFnAttr(NoBuiltinFD) ||
// CGF.CurFn->getAttributes().hasFnAttr(NoBuiltins);
// When directing calling an inline builtin, call it through it's mangled
// name to make it clear it's not the actual builtin.
auto Fn = cast<mlir::cir::FuncOp>(CGF.CurFn);
if (Fn.getName() != FDInlineName && onlyHasInlineBuiltinDeclaration(FD)) {
assert(0 && "NYI");
}
// Replaceable builtins provide their own implementation of a builtin. If we
// are in an inline builtin implementation, avoid trivial infinite
// recursion. Honor __attribute__((no_builtin("foo"))) or
// __attribute__((no_builtin)) on the current function unless foo is
// not a predefined library function which means we must generate the
// builtin no matter what.
else if (!IsPredefinedLibFunction || !HasAttributeNoBuiltin)
return CIRGenCallee::forBuiltin(builtinID, FD);
}
auto CalleePtr = buildFunctionDeclPointer(CGM, GD);
assert(!CGM.getLangOpts().CUDA && "NYI");
return CIRGenCallee::forDirect(CalleePtr, GD);
}
// TODO: this can also be abstrated into common AST helpers
bool CIRGenFunction::hasBooleanRepresentation(QualType Ty) {
if (Ty->isBooleanType())
return true;
if (const EnumType *ET = Ty->getAs<EnumType>())
return ET->getDecl()->getIntegerType()->isBooleanType();
if (const AtomicType *AT = Ty->getAs<AtomicType>())
return hasBooleanRepresentation(AT->getValueType());
return false;
}
CIRGenCallee CIRGenFunction::buildCallee(const clang::Expr *E) {
E = E->IgnoreParens();
// Look through function-to-pointer decay.
if (const auto *ICE = dyn_cast<ImplicitCastExpr>(E)) {
if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
return buildCallee(ICE->getSubExpr());
}
// Resolve direct calls.
} else if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
const auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
assert(FD &&
"DeclRef referring to FunctionDecl only thing supported so far");
return buildDirectCallee(CGM, FD);
}
assert(!dyn_cast<MemberExpr>(E) && "NYI");
assert(!dyn_cast<SubstNonTypeTemplateParmExpr>(E) && "NYI");
assert(!dyn_cast<CXXPseudoDestructorExpr>(E) && "NYI");
// Otherwise, we have an indirect reference.
mlir::Value calleePtr;
QualType functionType;
if (auto ptrType = E->getType()->getAs<clang::PointerType>()) {
calleePtr = buildScalarExpr(E);
functionType = ptrType->getPointeeType();
} else {
functionType = E->getType();
calleePtr = buildLValue(E).getPointer();
}
assert(functionType->isFunctionType());
GlobalDecl GD;
if (const auto *VD =
dyn_cast_or_null<VarDecl>(E->getReferencedDeclOfCallee()))
GD = GlobalDecl(VD);
CIRGenCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
CIRGenCallee callee(calleeInfo, calleePtr.getDefiningOp());
return callee;
assert(false && "Nothing else supported yet!");
}
mlir::Value CIRGenFunction::buildToMemory(mlir::Value Value, QualType Ty) {
// Bool has a different representation in memory than in registers.
return Value;
}
void CIRGenFunction::buildStoreOfScalar(mlir::Value value, LValue lvalue) {
// TODO: constant matrix type, no init, non temporal, TBAA
buildStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
lvalue.getType(), lvalue.getBaseInfo(), false, false);
}
void CIRGenFunction::buildStoreOfScalar(mlir::Value Value, Address Addr,
bool Volatile, QualType Ty,
LValueBaseInfo BaseInfo, bool isInit,
bool isNontemporal) {
Value = buildToMemory(Value, Ty);
LValue AtomicLValue = LValue::makeAddr(Addr, Ty, getContext(), BaseInfo);
if (Ty->isAtomicType() ||
(!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
buildAtomicStore(RValue::get(Value), AtomicLValue, isInit);
return;
}
if (const auto *ClangVecTy = Ty->getAs<clang::VectorType>()) {
if (!CGM.getCodeGenOpts().PreserveVec3Type &&
ClangVecTy->getNumElements() == 3)
llvm_unreachable("NYI: Special treatment of 3-element vector store");
}
// Update the alloca with more info on initialization.
assert(Addr.getPointer() && "expected pointer to exist");
auto SrcAlloca =
dyn_cast_or_null<mlir::cir::AllocaOp>(Addr.getPointer().getDefiningOp());
if (currVarDecl && SrcAlloca) {
const VarDecl *VD = currVarDecl;
assert(VD && "VarDecl expected");
if (VD->hasInit())
SrcAlloca.setInitAttr(mlir::UnitAttr::get(builder.getContext()));
}
assert(currSrcLoc && "must pass in source location");
builder.createStore(*currSrcLoc, Value, Addr, Volatile);
if (isNontemporal) {
llvm_unreachable("NYI");
}
if (MissingFeatures::tbaa())
llvm_unreachable("NYI");
}
void CIRGenFunction::buildStoreOfScalar(mlir::Value value, LValue lvalue,
bool isInit) {
if (lvalue.getType()->isConstantMatrixType()) {
llvm_unreachable("NYI");
}
buildStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
lvalue.getType(), lvalue.getBaseInfo(), isInit,
lvalue.isNontemporal());
}
/// Given an expression that represents a value lvalue, this
/// method emits the address of the lvalue, then loads the result as an rvalue,
/// returning the rvalue.
RValue CIRGenFunction::buildLoadOfLValue(LValue LV, SourceLocation Loc) {
assert(!LV.getType()->isFunctionType());
assert(!(LV.getType()->isConstantMatrixType()) && "not implemented");
if (LV.isBitField())
return buildLoadOfBitfieldLValue(LV, Loc);
if (LV.isSimple())
return RValue::get(buildLoadOfScalar(LV, Loc));
if (LV.isVectorElt()) {
auto load = builder.createLoad(getLoc(Loc), LV.getVectorAddress());
return RValue::get(builder.create<mlir::cir::VecExtractOp>(
getLoc(Loc), load, LV.getVectorIdx()));
}
if (LV.isExtVectorElt()) {
return buildLoadOfExtVectorElementLValue(LV);
}
llvm_unreachable("NYI");
}
int64_t CIRGenFunction::getAccessedFieldNo(unsigned int idx,
const mlir::ArrayAttr elts) {
auto elt = mlir::dyn_cast<mlir::IntegerAttr>(elts[idx]);
assert(elt && "The indices should be integer attributes");
return elt.getInt();
}
// If this is a reference to a subset of the elements of a vector, create an
// appropriate shufflevector.
RValue CIRGenFunction::buildLoadOfExtVectorElementLValue(LValue LV) {
mlir::Location loc = LV.getExtVectorPointer().getLoc();
mlir::Value Vec = builder.createLoad(loc, LV.getExtVectorAddress());
// HLSL allows treating scalars as one-element vectors. Converting the scalar
// IR value to a vector here allows the rest of codegen to behave as normal.
if (getLangOpts().HLSL && !mlir::isa<mlir::cir::VectorType>(Vec.getType())) {
llvm_unreachable("HLSL NYI");
}
const mlir::ArrayAttr Elts = LV.getExtVectorElts();
// If the result of the expression is a non-vector type, we must be extracting
// a single element. Just codegen as an extractelement.
const auto *ExprVT = LV.getType()->getAs<clang::VectorType>();
if (!ExprVT) {
int64_t InIdx = getAccessedFieldNo(0, Elts);
mlir::cir::ConstantOp Elt =
builder.getConstInt(loc, builder.getSInt64Ty(), InIdx);
return RValue::get(builder.create<mlir::cir::VecExtractOp>(loc, Vec, Elt));
}
// Always use shuffle vector to try to retain the original program structure
unsigned NumResultElts = ExprVT->getNumElements();
SmallVector<int64_t, 4> Mask;
for (unsigned i = 0; i != NumResultElts; ++i)
Mask.push_back(getAccessedFieldNo(i, Elts));
Vec = builder.createVecShuffle(loc, Vec, Mask);
return RValue::get(Vec);
}
RValue CIRGenFunction::buildLoadOfBitfieldLValue(LValue LV,
SourceLocation Loc) {
const CIRGenBitFieldInfo &info = LV.getBitFieldInfo();
// Get the output type.
mlir::Type resLTy = convertType(LV.getType());
Address ptr = LV.getBitFieldAddress();
bool useVolatile = LV.isVolatileQualified() &&
info.VolatileStorageSize != 0 && isAAPCS(CGM.getTarget());
auto field = builder.createGetBitfield(getLoc(Loc), resLTy, ptr.getPointer(),
ptr.getElementType(), info,
LV.isVolatile(), useVolatile);
assert(!MissingFeatures::emitScalarRangeCheck() && "NYI");
return RValue::get(field);
}
void CIRGenFunction::buildStoreThroughExtVectorComponentLValue(RValue Src,
LValue Dst) {
mlir::Location loc = Dst.getExtVectorPointer().getLoc();
// HLSL allows storing to scalar values through ExtVector component LValues.
// To support this we need to handle the case where the destination address is
// a scalar.
Address DstAddr = Dst.getExtVectorAddress();
if (!mlir::isa<mlir::cir::VectorType>(DstAddr.getElementType())) {
llvm_unreachable("HLSL NYI");
}
// This access turns into a read/modify/write of the vector. Load the input
// value now.
mlir::Value Vec = builder.createLoad(loc, DstAddr);
const mlir::ArrayAttr Elts = Dst.getExtVectorElts();
mlir::Value SrcVal = Src.getScalarVal();
if (const clang::VectorType *VTy =
Dst.getType()->getAs<clang::VectorType>()) {
unsigned NumSrcElts = VTy->getNumElements();
unsigned NumDstElts = cast<mlir::cir::VectorType>(Vec.getType()).getSize();
if (NumDstElts == NumSrcElts) {
// Use shuffle vector is the src and destination are the same number of
// elements and restore the vector mask since it is on the side it will be
// stored.
SmallVector<int64_t, 4> Mask(NumDstElts);
for (unsigned i = 0; i != NumSrcElts; ++i)
Mask[getAccessedFieldNo(i, Elts)] = i;
Vec = builder.createVecShuffle(loc, SrcVal, Mask);
} else if (NumDstElts > NumSrcElts) {
// Extended the source vector to the same length and then shuffle it
// into the destination.
// FIXME: since we're shuffling with undef, can we just use the indices
// into that? This could be simpler.
SmallVector<int64_t, 4> ExtMask;
for (unsigned i = 0; i != NumSrcElts; ++i)
ExtMask.push_back(i);
ExtMask.resize(NumDstElts, -1);
mlir::Value ExtSrcVal = builder.createVecShuffle(loc, SrcVal, ExtMask);
// build identity
SmallVector<int64_t, 4> Mask;
for (unsigned i = 0; i != NumDstElts; ++i)
Mask.push_back(i);
// When the vector size is odd and .odd or .hi is used, the last element
// of the Elts constant array will be one past the size of the vector.
// Ignore the last element here, if it is greater than the mask size.
if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
llvm_unreachable("NYI");
// modify when what gets shuffled in
for (unsigned i = 0; i != NumSrcElts; ++i)
Mask[getAccessedFieldNo(i, Elts)] = i + NumDstElts;
Vec = builder.createVecShuffle(loc, Vec, ExtSrcVal, Mask);
} else {
// We should never shorten the vector
llvm_unreachable("unexpected shorten vector length");
}
} else {
// If the Src is a scalar (not a vector), and the target is a vector it must
// be updating one element.
unsigned InIdx = getAccessedFieldNo(0, Elts);
auto Elt = builder.getSInt64(InIdx, loc);
Vec = builder.create<mlir::cir::VecInsertOp>(loc, Vec, SrcVal, Elt);
}
builder.createStore(loc, Vec, Dst.getExtVectorAddress(),
Dst.isVolatileQualified());
}
void CIRGenFunction::buildStoreThroughLValue(RValue Src, LValue Dst,
bool isInit) {
if (!Dst.isSimple()) {
if (Dst.isVectorElt()) {
// Read/modify/write the vector, inserting the new element
mlir::Location loc = Dst.getVectorPointer().getLoc();
mlir::Value Vector = builder.createLoad(loc, Dst.getVectorAddress());
Vector = builder.create<mlir::cir::VecInsertOp>(
loc, Vector, Src.getScalarVal(), Dst.getVectorIdx());
builder.createStore(loc, Vector, Dst.getVectorAddress());
return;
}
if (Dst.isExtVectorElt())
return buildStoreThroughExtVectorComponentLValue(Src, Dst);
assert(Dst.isBitField() && "NIY LValue type");
mlir::Value result;
return buildStoreThroughBitfieldLValue(Src, Dst, result);
}
assert(Dst.isSimple() && "only implemented simple");
// There's special magic for assigning into an ARC-qualified l-value.
if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
llvm_unreachable("NYI");
}
if (Dst.isObjCWeak() && !Dst.isNonGC()) {
llvm_unreachable("NYI");
}
if (Dst.isObjCStrong() && !Dst.isNonGC()) {
llvm_unreachable("NYI");
}
assert(Src.isScalar() && "Can't emit an agg store with this method");
buildStoreOfScalar(Src.getScalarVal(), Dst, isInit);
}
void CIRGenFunction::buildStoreThroughBitfieldLValue(RValue Src, LValue Dst,
mlir::Value &Result) {
// According to the AACPS:
// When a volatile bit-field is written, and its container does not overlap
// with any non-bit-field member, its container must be read exactly once
// and written exactly once using the access width appropriate to the type
// of the container. The two accesses are not atomic.
if (Dst.isVolatileQualified() && isAAPCS(CGM.getTarget()) &&
CGM.getCodeGenOpts().ForceAAPCSBitfieldLoad)
llvm_unreachable("volatile bit-field is not implemented for the AACPS");
const CIRGenBitFieldInfo &info = Dst.getBitFieldInfo();
mlir::Type resLTy = getTypes().convertTypeForMem(Dst.getType());
Address ptr = Dst.getBitFieldAddress();
const bool useVolatile =
CGM.getCodeGenOpts().AAPCSBitfieldWidth && Dst.isVolatileQualified() &&
info.VolatileStorageSize != 0 && isAAPCS(CGM.getTarget());
mlir::Value dstAddr = Dst.getAddress().getPointer();
Result = builder.createSetBitfield(
dstAddr.getLoc(), resLTy, dstAddr, ptr.getElementType(),
Src.getScalarVal(), info, Dst.isVolatileQualified(), useVolatile);
}
static LValue buildGlobalVarDeclLValue(CIRGenFunction &CGF, const Expr *E,
const VarDecl *VD) {
QualType T = E->getType();
// If it's thread_local, emit a call to its wrapper function instead.
if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
CGF.CGM.getCXXABI().usesThreadWrapperFunction(VD))
assert(0 && "not implemented");
// Check if the variable is marked as declare target with link clause in
// device codegen.
if (CGF.getLangOpts().OpenMP)
llvm_unreachable("not implemented");
// Traditional LLVM codegen handles thread local separately, CIR handles
// as part of getAddrOfGlobalVar.
auto V = CGF.CGM.getAddrOfGlobalVar(VD);
auto RealVarTy = CGF.getTypes().convertTypeForMem(VD->getType());
auto realPtrTy = CGF.getBuilder().getPointerTo(RealVarTy);
if (realPtrTy != V.getType())
V = CGF.getBuilder().createBitcast(V.getLoc(), V, realPtrTy);
CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
Address Addr(V, RealVarTy, Alignment);
// Emit reference to the private copy of the variable if it is an OpenMP
// threadprivate variable.
if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
VD->hasAttr<clang::OMPThreadPrivateDeclAttr>()) {
assert(0 && "NYI");
}
LValue LV;
if (VD->getType()->isReferenceType())
assert(0 && "NYI");
else
LV = CGF.makeAddrLValue(Addr, T, AlignmentSource::Decl);
assert(!MissingFeatures::setObjCGCLValueClass() && "NYI");
return LV;
}
static LValue buildCapturedFieldLValue(CIRGenFunction &CGF, const FieldDecl *FD,
mlir::Value ThisValue) {
QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
return CGF.buildLValueForField(LV, FD);
}
static LValue buildFunctionDeclLValue(CIRGenFunction &CGF, const Expr *E,
GlobalDecl GD) {
const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
auto funcOp = buildFunctionDeclPointer(CGF.CGM, GD);
auto loc = CGF.getLoc(E->getSourceRange());
CharUnits align = CGF.getContext().getDeclAlign(FD);
mlir::Type fnTy = funcOp.getFunctionType();
auto ptrTy = mlir::cir::PointerType::get(CGF.getBuilder().getContext(), fnTy);
mlir::Value addr = CGF.getBuilder().create<mlir::cir::GetGlobalOp>(
loc, ptrTy, funcOp.getSymName());
if (funcOp.getFunctionType() !=
CGF.CGM.getTypes().ConvertType(FD->getType())) {
fnTy = CGF.CGM.getTypes().ConvertType(FD->getType());
ptrTy = mlir::cir::PointerType::get(CGF.getBuilder().getContext(), fnTy);
addr = CGF.getBuilder().create<mlir::cir::CastOp>(
addr.getLoc(), ptrTy, mlir::cir::CastKind::bitcast, addr);
}
return CGF.makeAddrLValue(Address(addr, fnTy, align), E->getType(),
AlignmentSource::Decl);
}
LValue CIRGenFunction::buildDeclRefLValue(const DeclRefExpr *E) {
const NamedDecl *ND = E->getDecl();
QualType T = E->getType();
assert(E->isNonOdrUse() != NOUR_Unevaluated &&
"should not emit an unevaluated operand");
if (const auto *VD = dyn_cast<VarDecl>(ND)) {
// Global Named registers access via intrinsics only
if (VD->getStorageClass() == SC_Register && VD->hasAttr<AsmLabelAttr>() &&
!VD->isLocalVarDecl())
llvm_unreachable("NYI");
assert(E->isNonOdrUse() != NOUR_Constant && "not implemented");
// Check for captured variables.
if (E->refersToEnclosingVariableOrCapture()) {
VD = VD->getCanonicalDecl();
if (auto *FD = LambdaCaptureFields.lookup(VD))
return buildCapturedFieldLValue(*this, FD, CXXABIThisValue);
assert(!MissingFeatures::CGCapturedStmtInfo() && "NYI");
// TODO[OpenMP]: Find the appropiate captured variable value and return
// it.
// TODO[OpenMP]: Set non-temporal information in the captured LVal.
// LLVM codegen:
assert(!MissingFeatures::openMP());
// Address addr = GetAddrOfBlockDecl(VD);
// return MakeAddrLValue(addr, T, AlignmentSource::Decl);
}
}
// FIXME(CIR): We should be able to assert this for FunctionDecls as well!
// FIXME(CIR): We should be able to assert this for all DeclRefExprs, not just
// those with a valid source location.
assert((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() ||
!E->getLocation().isValid()) &&
"Should not use decl without marking it used!");
if (ND->hasAttr<WeakRefAttr>()) {
llvm_unreachable("NYI");
}
if (const auto *VD = dyn_cast<VarDecl>(ND)) {
// Check if this is a global variable
if (VD->hasLinkage() || VD->isStaticDataMember())
return buildGlobalVarDeclLValue(*this, E, VD);
Address addr = Address::invalid();
// The variable should generally be present in the local decl map.
auto iter = LocalDeclMap.find(VD);
if (iter != LocalDeclMap.end()) {
addr = iter->second;
}
// Otherwise, it might be static local we haven't emitted yet for some
// reason; most likely, because it's in an outer function.
else if (VD->isStaticLocal()) {
mlir::cir::GlobalOp var = CGM.getOrCreateStaticVarDecl(
*VD, CGM.getCIRLinkageVarDefinition(VD, /*IsConstant=*/false));
addr = Address(builder.createGetGlobal(var), convertType(VD->getType()),
getContext().getDeclAlign(VD));
} else {
llvm_unreachable("DeclRefExpr for decl not entered in LocalDeclMap?");
}
// Handle threadlocal function locals.
if (VD->getTLSKind() != VarDecl::TLS_None)