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LowerToLLVM.cpp
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//====- LowerToLLVM.cpp - Lowering from CIR to LLVMIR ---------------------===//
//
// 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 lowering of CIR operations to LLVMIR.
//
//===----------------------------------------------------------------------===//
#include "LowerToLLVM.h"
#include "LoweringHelpers.h"
#include "mlir/Conversion/AffineToStandard/AffineToStandard.h"
#include "mlir/Conversion/ControlFlowToLLVM/ControlFlowToLLVM.h"
#include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVMPass.h"
#include "mlir/Conversion/ReconcileUnrealizedCasts/ReconcileUnrealizedCasts.h"
#include "mlir/Conversion/SCFToControlFlow/SCFToControlFlow.h"
#include "mlir/Dialect/DLTI/DLTI.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/LLVMIR/Transforms/Passes.h"
#include "mlir/IR/Attributes.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/BuiltinAttributeInterfaces.h"
#include "mlir/IR/BuiltinAttributes.h"
#include "mlir/IR/BuiltinDialect.h"
#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/OpDefinition.h"
#include "mlir/IR/Operation.h"
#include "mlir/IR/Types.h"
#include "mlir/IR/Value.h"
#include "mlir/IR/ValueRange.h"
#include "mlir/IR/Visitors.h"
#include "mlir/Interfaces/DataLayoutInterfaces.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Pass/PassManager.h"
#include "mlir/Support/LLVM.h"
#include "mlir/Support/LogicalResult.h"
#include "mlir/Target/LLVMIR/Dialect/Builtin/BuiltinToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Export.h"
#include "clang/CIR/Dialect/IR/CIRAttrVisitor.h"
#include "clang/CIR/Dialect/Passes.h"
#include "clang/CIR/LoweringHelpers.h"
#include "clang/CIR/MissingFeatures.h"
#include "clang/CIR/Passes.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TimeProfiler.h"
#include <cstdint>
#include <deque>
#include <optional>
#include <set>
using namespace cir;
using namespace llvm;
namespace cir {
namespace direct {
//===----------------------------------------------------------------------===//
// Helper Methods
//===----------------------------------------------------------------------===//
namespace {
/// Walks a region while skipping operations of type `Ops`. This ensures the
/// callback is not applied to said operations and its children.
template <typename... Ops>
void walkRegionSkipping(mlir::Region ®ion,
mlir::function_ref<void(mlir::Operation *)> callback) {
region.walk<mlir::WalkOrder::PreOrder>([&](mlir::Operation *op) {
if (isa<Ops...>(op))
return mlir::WalkResult::skip();
callback(op);
return mlir::WalkResult::advance();
});
}
/// Convert from a CIR comparison kind to an LLVM IR integral comparison kind.
mlir::LLVM::ICmpPredicate convertCmpKindToICmpPredicate(cir::CmpOpKind kind,
bool isSigned) {
using CIR = cir::CmpOpKind;
using LLVMICmp = mlir::LLVM::ICmpPredicate;
switch (kind) {
case CIR::eq:
return LLVMICmp::eq;
case CIR::ne:
return LLVMICmp::ne;
case CIR::lt:
return (isSigned ? LLVMICmp::slt : LLVMICmp::ult);
case CIR::le:
return (isSigned ? LLVMICmp::sle : LLVMICmp::ule);
case CIR::gt:
return (isSigned ? LLVMICmp::sgt : LLVMICmp::ugt);
case CIR::ge:
return (isSigned ? LLVMICmp::sge : LLVMICmp::uge);
}
llvm_unreachable("Unknown CmpOpKind");
}
/// Convert from a CIR comparison kind to an LLVM IR floating-point comparison
/// kind.
mlir::LLVM::FCmpPredicate convertCmpKindToFCmpPredicate(cir::CmpOpKind kind) {
using CIR = cir::CmpOpKind;
using LLVMFCmp = mlir::LLVM::FCmpPredicate;
switch (kind) {
case CIR::eq:
return LLVMFCmp::oeq;
case CIR::ne:
return LLVMFCmp::une;
case CIR::lt:
return LLVMFCmp::olt;
case CIR::le:
return LLVMFCmp::ole;
case CIR::gt:
return LLVMFCmp::ogt;
case CIR::ge:
return LLVMFCmp::oge;
}
llvm_unreachable("Unknown CmpOpKind");
}
/// If the given type is a vector type, return the vector's element type.
/// Otherwise return the given type unchanged.
mlir::Type elementTypeIfVector(mlir::Type type) {
if (auto VecType = mlir::dyn_cast<cir::VectorType>(type)) {
return VecType.getEltType();
}
return type;
}
mlir::LLVM::Visibility
lowerCIRVisibilityToLLVMVisibility(cir::VisibilityKind visibilityKind) {
switch (visibilityKind) {
case cir::VisibilityKind::Default:
return ::mlir::LLVM::Visibility::Default;
case cir::VisibilityKind::Hidden:
return ::mlir::LLVM::Visibility::Hidden;
case cir::VisibilityKind::Protected:
return ::mlir::LLVM::Visibility::Protected;
}
}
// Make sure the LLVM function we are about to create a call for actually
// exists, if not create one. Returns a function
void getOrCreateLLVMFuncOp(mlir::ConversionPatternRewriter &rewriter,
mlir::Operation *srcOp, llvm::StringRef fnName,
mlir::Type fnTy) {
auto modOp = srcOp->getParentOfType<mlir::ModuleOp>();
auto enclosingFnOp = srcOp->getParentOfType<mlir::LLVM::LLVMFuncOp>();
auto *sourceSymbol = mlir::SymbolTable::lookupSymbolIn(modOp, fnName);
if (!sourceSymbol) {
mlir::OpBuilder::InsertionGuard guard(rewriter);
rewriter.setInsertionPoint(enclosingFnOp);
rewriter.create<mlir::LLVM::LLVMFuncOp>(srcOp->getLoc(), fnName, fnTy);
}
}
static constexpr StringRef llvmMetadataSectionName = "llvm.metadata";
// Create a string global for annotation related string.
mlir::LLVM::GlobalOp
getAnnotationStringGlobal(mlir::StringAttr strAttr, mlir::ModuleOp &module,
llvm::StringMap<mlir::LLVM::GlobalOp> &globalsMap,
mlir::OpBuilder &globalVarBuilder,
mlir::Location &loc, bool isArg = false) {
llvm::StringRef str = strAttr.getValue();
if (!globalsMap.contains(str)) {
auto llvmStrTy = mlir::LLVM::LLVMArrayType::get(
mlir::IntegerType::get(module.getContext(), 8), str.size() + 1);
auto strGlobalOp = globalVarBuilder.create<mlir::LLVM::GlobalOp>(
loc, llvmStrTy,
/*isConstant=*/true, mlir::LLVM::Linkage::Private,
".str" +
(globalsMap.empty() ? ""
: "." + std::to_string(globalsMap.size())) +
".annotation" + (isArg ? ".arg" : ""),
mlir::StringAttr::get(module.getContext(), std::string(str) + '\0'),
/*alignment=*/isArg ? 1 : 0);
if (!isArg)
strGlobalOp.setSection(llvmMetadataSectionName);
strGlobalOp.setUnnamedAddr(mlir::LLVM::UnnamedAddr::Global);
strGlobalOp.setDsoLocal(true);
globalsMap[str] = strGlobalOp;
}
return globalsMap[str];
}
mlir::LLVM::GlobalOp getOrCreateAnnotationArgsVar(
mlir::Location &loc, mlir::ModuleOp &module,
mlir::OpBuilder &globalVarBuilder,
llvm::StringMap<mlir::LLVM::GlobalOp> &argStringGlobalsMap,
llvm::MapVector<mlir::ArrayAttr, mlir::LLVM::GlobalOp> &argsVarMap,
mlir::ArrayAttr argsAttr) {
if (argsVarMap.contains(argsAttr))
return argsVarMap[argsAttr];
mlir::LLVM::LLVMPointerType annoPtrTy =
mlir::LLVM::LLVMPointerType::get(globalVarBuilder.getContext());
llvm::SmallVector<mlir::Type> argStrutFldTypes;
llvm::SmallVector<mlir::Value> argStrutFields;
for (mlir::Attribute arg : argsAttr) {
if (auto strArgAttr = mlir::dyn_cast<mlir::StringAttr>(arg)) {
// Call getAnnotationStringGlobal here to make sure
// have a global for this string before
// creation of the args var.
getAnnotationStringGlobal(strArgAttr, module, argStringGlobalsMap,
globalVarBuilder, loc, true);
// This will become a ptr to the global string
argStrutFldTypes.push_back(annoPtrTy);
} else if (auto intArgAttr = mlir::dyn_cast<mlir::IntegerAttr>(arg)) {
argStrutFldTypes.push_back(intArgAttr.getType());
} else {
llvm_unreachable("Unsupported annotation arg type");
}
}
mlir::LLVM::LLVMStructType argsStructTy =
mlir::LLVM::LLVMStructType::getLiteral(globalVarBuilder.getContext(),
argStrutFldTypes);
auto argsGlobalOp = globalVarBuilder.create<mlir::LLVM::GlobalOp>(
loc, argsStructTy, true, mlir::LLVM::Linkage::Private,
".args" +
(argsVarMap.empty() ? "" : "." + std::to_string(argsVarMap.size())) +
".annotation",
mlir::Attribute());
argsGlobalOp.setSection(llvmMetadataSectionName);
argsGlobalOp.setUnnamedAddr(mlir::LLVM::UnnamedAddr::Global);
argsGlobalOp.setDsoLocal(true);
// Create the initializer for this args global
argsGlobalOp.getRegion().push_back(new mlir::Block());
mlir::OpBuilder argsInitBuilder(module.getContext());
argsInitBuilder.setInsertionPointToEnd(argsGlobalOp.getInitializerBlock());
mlir::Value argsStructInit =
argsInitBuilder.create<mlir::LLVM::UndefOp>(loc, argsStructTy);
int idx = 0;
for (mlir::Attribute arg : argsAttr) {
if (auto strArgAttr = mlir::dyn_cast<mlir::StringAttr>(arg)) {
// This would be simply return with existing map entry value
// from argStringGlobalsMap as string global is already
// created in the previous loop.
mlir::LLVM::GlobalOp argStrVar = getAnnotationStringGlobal(
strArgAttr, module, argStringGlobalsMap, globalVarBuilder, loc, true);
auto argStrVarAddr = argsInitBuilder.create<mlir::LLVM::AddressOfOp>(
loc, annoPtrTy, argStrVar.getSymName());
argsStructInit = argsInitBuilder.create<mlir::LLVM::InsertValueOp>(
loc, argsStructInit, argStrVarAddr, idx++);
} else if (auto intArgAttr = mlir::dyn_cast<mlir::IntegerAttr>(arg)) {
auto intArgFld = argsInitBuilder.create<mlir::LLVM::ConstantOp>(
loc, intArgAttr.getType(), intArgAttr.getValue());
argsStructInit = argsInitBuilder.create<mlir::LLVM::InsertValueOp>(
loc, argsStructInit, intArgFld, idx++);
} else {
llvm_unreachable("Unsupported annotation arg type");
}
}
argsInitBuilder.create<mlir::LLVM::ReturnOp>(loc, argsStructInit);
argsVarMap[argsAttr] = argsGlobalOp;
return argsGlobalOp;
}
/// Lower an annotation value to a series of LLVM globals, `outVals` contains
/// all values which are either used to build other globals or for intrisic call
/// arguments.
void lowerAnnotationValue(
mlir::Location &localLoc, mlir::Location annotLoc,
cir::AnnotationAttr annotation, mlir::ModuleOp &module,
mlir::OpBuilder &varInitBuilder, mlir::OpBuilder &globalVarBuilder,
llvm::StringMap<mlir::LLVM::GlobalOp> &stringGlobalsMap,
llvm::StringMap<mlir::LLVM::GlobalOp> &argStringGlobalsMap,
llvm::MapVector<mlir::ArrayAttr, mlir::LLVM::GlobalOp> &argsVarMap,
SmallVectorImpl<mlir::Value> &outVals) {
mlir::LLVM::LLVMPointerType annoPtrTy =
mlir::LLVM::LLVMPointerType::get(globalVarBuilder.getContext());
// First field is either a global name or a alloca address and is handled
// by the caller, this function deals with content from `AnnotationAttr`
// only.
// The second field is ptr to the annotation name
mlir::StringAttr annotationName = annotation.getName();
auto annotationNameFld = varInitBuilder.create<mlir::LLVM::AddressOfOp>(
localLoc, annoPtrTy,
getAnnotationStringGlobal(annotationName, module, stringGlobalsMap,
globalVarBuilder, localLoc)
.getSymName());
outVals.push_back(annotationNameFld->getResult(0));
// The third field is ptr to the translation unit name,
// and the fourth field is the line number
if (mlir::isa<mlir::FusedLoc>(annotLoc)) {
auto FusedLoc = mlir::cast<mlir::FusedLoc>(annotLoc);
annotLoc = FusedLoc.getLocations()[0];
}
auto annotFileLoc = mlir::cast<mlir::FileLineColLoc>(annotLoc);
assert(annotFileLoc && "annotation value has to be FileLineColLoc");
// To be consistent with clang code gen, we add trailing null char
auto fileName = mlir::StringAttr::get(
module.getContext(), std::string(annotFileLoc.getFilename().getValue()));
auto fileNameFld = varInitBuilder.create<mlir::LLVM::AddressOfOp>(
localLoc, annoPtrTy,
getAnnotationStringGlobal(fileName, module, stringGlobalsMap,
globalVarBuilder, localLoc)
.getSymName());
outVals.push_back(fileNameFld->getResult(0));
unsigned int lineNo = annotFileLoc.getLine();
auto lineNoFld = varInitBuilder.create<mlir::LLVM::ConstantOp>(
localLoc, globalVarBuilder.getI32Type(), lineNo);
outVals.push_back(lineNoFld->getResult(0));
// The fifth field is ptr to the annotation args var, it could be null
if (annotation.isNoArgs()) {
auto nullPtrFld =
varInitBuilder.create<mlir::LLVM::ZeroOp>(localLoc, annoPtrTy);
outVals.push_back(nullPtrFld->getResult(0));
} else {
mlir::ArrayAttr argsAttr = annotation.getArgs();
mlir::LLVM::GlobalOp annotArgsVar =
getOrCreateAnnotationArgsVar(localLoc, module, globalVarBuilder,
argStringGlobalsMap, argsVarMap, argsAttr);
auto argsVarView = varInitBuilder.create<mlir::LLVM::AddressOfOp>(
localLoc, annoPtrTy, annotArgsVar.getSymName());
outVals.push_back(argsVarView->getResult(0));
}
}
// Get addrspace by converting a pointer type.
// TODO: The approach here is a little hacky. We should access the target info
// directly to convert the address space of global op, similar to what we do
// for type converter.
unsigned getGlobalOpTargetAddrSpace(mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter,
cir::GlobalOp op) {
auto tempPtrTy = cir::PointerType::get(rewriter.getContext(), op.getSymType(),
op.getAddrSpaceAttr());
return cast<mlir::LLVM::LLVMPointerType>(converter->convertType(tempPtrTy))
.getAddressSpace();
}
/// Given a type convertor and a data layout, convert the given type to a type
/// that is suitable for memory operations. For example, this can be used to
/// lower cir.bool accesses to i8.
static mlir::Type convertTypeForMemory(const mlir::TypeConverter &converter,
mlir::DataLayout const &dataLayout,
mlir::Type type) {
// TODO(cir): Handle other types similarly to clang's codegen
// convertTypeForMemory
if (isa<cir::BoolType>(type)) {
return mlir::IntegerType::get(type.getContext(),
dataLayout.getTypeSizeInBits(type));
}
return converter.convertType(type);
}
/// Emits the value from memory as expected by its users. Should be called when
/// the memory represetnation of a CIR type is not equal to its scalar
/// representation.
static mlir::Value emitFromMemory(mlir::ConversionPatternRewriter &rewriter,
mlir::DataLayout const &dataLayout,
cir::LoadOp op, mlir::Value value) {
// TODO(cir): Handle other types similarly to clang's codegen EmitFromMemory
if (auto boolTy = mlir::dyn_cast<cir::BoolType>(op.getResult().getType())) {
// Create a cast value from specified size in datalayout to i1
assert(value.getType().isInteger(dataLayout.getTypeSizeInBits(boolTy)));
return createIntCast(rewriter, value, rewriter.getI1Type());
}
return value;
}
/// Emits a value to memory with the expected scalar type. Should be called when
/// the memory represetnation of a CIR type is not equal to its scalar
/// representation.
static mlir::Value emitToMemory(mlir::ConversionPatternRewriter &rewriter,
mlir::DataLayout const &dataLayout,
mlir::Type origType, mlir::Value value) {
// TODO(cir): Handle other types similarly to clang's codegen EmitToMemory
if (auto boolTy = mlir::dyn_cast<cir::BoolType>(origType)) {
// Create zext of value from i1 to i8
auto memType =
rewriter.getIntegerType(dataLayout.getTypeSizeInBits(boolTy));
return createIntCast(rewriter, value, memType);
}
return value;
}
} // namespace
//===----------------------------------------------------------------------===//
// Visitors for Lowering CIR Const Attributes
//===----------------------------------------------------------------------===//
/// Emits a value to memory with the expected scalar type. Should be called when
/// the memory represetnation of a CIR attribute's type is not equal to its
/// scalar representation.
static mlir::Value
emitCirAttrToMemory(mlir::Operation *parentOp, mlir::Attribute attr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter,
mlir::DataLayout const &dataLayout) {
mlir::Value loweredValue =
lowerCirAttrAsValue(parentOp, attr, rewriter, converter, dataLayout);
if (auto boolAttr = mlir::dyn_cast<cir::BoolAttr>(attr)) {
return emitToMemory(rewriter, dataLayout, boolAttr.getType(), loweredValue);
}
return loweredValue;
}
/// Switches on the type of attribute and calls the appropriate conversion.
class CirAttrToValue : public CirAttrVisitor<CirAttrToValue, mlir::Value> {
public:
CirAttrToValue(mlir::Operation *parentOp,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter,
mlir::DataLayout const &dataLayout)
: parentOp(parentOp), rewriter(rewriter), converter(converter),
dataLayout(dataLayout) {}
mlir::Value visitCirIntAttr(cir::IntAttr attr);
mlir::Value visitCirFPAttr(cir::FPAttr attr);
mlir::Value visitCirConstPtrAttr(cir::ConstPtrAttr attr);
mlir::Value visitCirConstStructAttr(cir::ConstStructAttr attr);
mlir::Value visitCirConstArrayAttr(cir::ConstArrayAttr attr);
mlir::Value visitCirConstVectorAttr(cir::ConstVectorAttr attr);
mlir::Value visitCirBoolAttr(cir::BoolAttr attr);
mlir::Value visitCirZeroAttr(cir::ZeroAttr attr);
mlir::Value visitCirUndefAttr(cir::UndefAttr attr);
mlir::Value visitCirPoisonAttr(cir::PoisonAttr attr);
mlir::Value visitCirGlobalViewAttr(cir::GlobalViewAttr attr);
mlir::Value visitCirVTableAttr(cir::VTableAttr attr);
mlir::Value visitCirTypeInfoAttr(cir::TypeInfoAttr attr);
private:
mlir::Operation *parentOp;
mlir::ConversionPatternRewriter &rewriter;
const mlir::TypeConverter *converter;
mlir::DataLayout const &dataLayout;
};
/// IntAttr visitor.
mlir::Value CirAttrToValue::visitCirIntAttr(cir::IntAttr intAttr) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(intAttr.getType()), intAttr.getValue());
}
/// BoolAttr visitor.
mlir::Value CirAttrToValue::visitCirBoolAttr(cir::BoolAttr boolAttr) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(boolAttr.getType()), boolAttr.getValue());
}
/// ConstPtrAttr visitor.
mlir::Value CirAttrToValue::visitCirConstPtrAttr(cir::ConstPtrAttr ptrAttr) {
auto loc = parentOp->getLoc();
if (ptrAttr.isNullValue()) {
return rewriter.create<mlir::LLVM::ZeroOp>(
loc, converter->convertType(ptrAttr.getType()));
}
mlir::DataLayout layout(parentOp->getParentOfType<mlir::ModuleOp>());
mlir::Value ptrVal = rewriter.create<mlir::LLVM::ConstantOp>(
loc, rewriter.getIntegerType(layout.getTypeSizeInBits(ptrAttr.getType())),
ptrAttr.getValue().getInt());
return rewriter.create<mlir::LLVM::IntToPtrOp>(
loc, converter->convertType(ptrAttr.getType()), ptrVal);
}
/// FPAttr visitor.
mlir::Value CirAttrToValue::visitCirFPAttr(cir::FPAttr fltAttr) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(fltAttr.getType()), fltAttr.getValue());
}
/// ZeroAttr visitor.
mlir::Value CirAttrToValue::visitCirZeroAttr(cir::ZeroAttr zeroAttr) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ZeroOp>(
loc, converter->convertType(zeroAttr.getType()));
}
/// UndefAttr visitor.
mlir::Value CirAttrToValue::visitCirUndefAttr(cir::UndefAttr undefAttr) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::UndefOp>(
loc, converter->convertType(undefAttr.getType()));
}
/// PoisonAttr visitor.
mlir::Value CirAttrToValue::visitCirPoisonAttr(cir::PoisonAttr poisonAttr) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::PoisonOp>(
loc, converter->convertType(poisonAttr.getType()));
}
/// ConstStruct visitor.
mlir::Value
CirAttrToValue::visitCirConstStructAttr(cir::ConstStructAttr constStruct) {
auto llvmTy = converter->convertType(constStruct.getType());
auto loc = parentOp->getLoc();
mlir::Value result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
// Iteratively lower each constant element of the struct.
for (auto [idx, elt] : llvm::enumerate(constStruct.getMembers())) {
mlir::Value init =
emitCirAttrToMemory(parentOp, elt, rewriter, converter, dataLayout);
result = rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
return result;
}
// VTableAttr visitor.
mlir::Value CirAttrToValue::visitCirVTableAttr(cir::VTableAttr vtableArr) {
auto llvmTy = converter->convertType(vtableArr.getType());
auto loc = parentOp->getLoc();
mlir::Value result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
for (auto [idx, elt] : llvm::enumerate(vtableArr.getVtableData())) {
mlir::Value init = visit(elt);
result = rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
return result;
}
// TypeInfoAttr visitor.
mlir::Value
CirAttrToValue::visitCirTypeInfoAttr(cir::TypeInfoAttr typeinfoArr) {
auto llvmTy = converter->convertType(typeinfoArr.getType());
auto loc = parentOp->getLoc();
mlir::Value result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
for (auto [idx, elt] : llvm::enumerate(typeinfoArr.getData())) {
mlir::Value init = visit(elt);
result = rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
return result;
}
// ConstArrayAttr visitor
mlir::Value
CirAttrToValue::visitCirConstArrayAttr(cir::ConstArrayAttr constArr) {
auto llvmTy = converter->convertType(constArr.getType());
auto loc = parentOp->getLoc();
mlir::Value result;
if (auto zeros = constArr.getTrailingZerosNum()) {
auto arrayTy = constArr.getType();
result = rewriter.create<mlir::LLVM::ZeroOp>(
loc, converter->convertType(arrayTy));
} else {
result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
}
// Iteratively lower each constant element of the array.
if (auto arrayAttr = mlir::dyn_cast<mlir::ArrayAttr>(constArr.getElts())) {
for (auto [idx, elt] : llvm::enumerate(arrayAttr)) {
mlir::Value init =
emitCirAttrToMemory(parentOp, elt, rewriter, converter, dataLayout);
result =
rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
}
// TODO(cir): this diverges from traditional lowering. Normally the string
// would be a global constant that is memcopied.
else if (auto strAttr =
mlir::dyn_cast<mlir::StringAttr>(constArr.getElts())) {
auto arrayTy = mlir::dyn_cast<cir::ArrayType>(strAttr.getType());
assert(arrayTy && "String attribute must have an array type");
auto eltTy = arrayTy.getEltType();
for (auto [idx, elt] : llvm::enumerate(strAttr)) {
auto init = rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(eltTy), elt);
result =
rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
} else {
llvm_unreachable("unexpected ConstArrayAttr elements");
}
return result;
}
// ConstVectorAttr visitor.
mlir::Value
CirAttrToValue::visitCirConstVectorAttr(cir::ConstVectorAttr constVec) {
auto llvmTy = converter->convertType(constVec.getType());
auto loc = parentOp->getLoc();
SmallVector<mlir::Attribute> mlirValues;
for (auto elementAttr : constVec.getElts()) {
mlir::Attribute mlirAttr;
if (auto intAttr = mlir::dyn_cast<cir::IntAttr>(elementAttr)) {
mlirAttr = rewriter.getIntegerAttr(
converter->convertType(intAttr.getType()), intAttr.getValue());
} else if (auto floatAttr = mlir::dyn_cast<cir::FPAttr>(elementAttr)) {
mlirAttr = rewriter.getFloatAttr(
converter->convertType(floatAttr.getType()), floatAttr.getValue());
} else {
llvm_unreachable(
"vector constant with an element that is neither an int nor a float");
}
mlirValues.push_back(mlirAttr);
}
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, llvmTy,
mlir::DenseElementsAttr::get(mlir::cast<mlir::ShapedType>(llvmTy),
mlirValues));
}
// GlobalViewAttr visitor.
mlir::Value
CirAttrToValue::visitCirGlobalViewAttr(cir::GlobalViewAttr globalAttr) {
auto module = parentOp->getParentOfType<mlir::ModuleOp>();
mlir::Type sourceType;
unsigned sourceAddrSpace = 0;
llvm::StringRef symName;
auto *sourceSymbol =
mlir::SymbolTable::lookupSymbolIn(module, globalAttr.getSymbol());
if (auto llvmSymbol = dyn_cast<mlir::LLVM::GlobalOp>(sourceSymbol)) {
sourceType = llvmSymbol.getType();
symName = llvmSymbol.getSymName();
sourceAddrSpace = llvmSymbol.getAddrSpace();
} else if (auto cirSymbol = dyn_cast<cir::GlobalOp>(sourceSymbol)) {
sourceType =
convertTypeForMemory(*converter, dataLayout, cirSymbol.getSymType());
symName = cirSymbol.getSymName();
sourceAddrSpace =
getGlobalOpTargetAddrSpace(rewriter, converter, cirSymbol);
} else if (auto llvmFun = dyn_cast<mlir::LLVM::LLVMFuncOp>(sourceSymbol)) {
sourceType = llvmFun.getFunctionType();
symName = llvmFun.getSymName();
sourceAddrSpace = 0;
} else if (auto fun = dyn_cast<cir::FuncOp>(sourceSymbol)) {
sourceType = converter->convertType(fun.getFunctionType());
symName = fun.getSymName();
sourceAddrSpace = 0;
} else {
llvm_unreachable("Unexpected GlobalOp type");
}
auto loc = parentOp->getLoc();
mlir::Value addrOp = rewriter.create<mlir::LLVM::AddressOfOp>(
loc,
mlir::LLVM::LLVMPointerType::get(rewriter.getContext(), sourceAddrSpace),
symName);
if (globalAttr.getIndices()) {
llvm::SmallVector<mlir::LLVM::GEPArg> indices;
if (isa<mlir::LLVM::LLVMArrayType, mlir::LLVM::LLVMStructType>(sourceType))
indices.push_back(0);
for (auto idx : globalAttr.getIndices()) {
auto intAttr = dyn_cast<mlir::IntegerAttr>(idx);
assert(intAttr && "index must be integers");
indices.push_back(intAttr.getValue().getSExtValue());
}
auto resTy = addrOp.getType();
auto eltTy = converter->convertType(sourceType);
addrOp = rewriter.create<mlir::LLVM::GEPOp>(loc, resTy, eltTy, addrOp,
indices, true);
}
if (auto intTy = mlir::dyn_cast<cir::IntType>(globalAttr.getType())) {
auto llvmDstTy = converter->convertType(globalAttr.getType());
return rewriter.create<mlir::LLVM::PtrToIntOp>(parentOp->getLoc(),
llvmDstTy, addrOp);
}
if (auto ptrTy = mlir::dyn_cast<cir::PointerType>(globalAttr.getType())) {
auto llvmEltTy =
convertTypeForMemory(*converter, dataLayout, ptrTy.getPointee());
if (llvmEltTy == sourceType)
return addrOp;
auto llvmDstTy = converter->convertType(globalAttr.getType());
return rewriter.create<mlir::LLVM::BitcastOp>(parentOp->getLoc(), llvmDstTy,
addrOp);
}
llvm_unreachable("Expecting pointer or integer type for GlobalViewAttr");
}
/// Switches on the type of attribute and calls the appropriate conversion.
mlir::Value lowerCirAttrAsValue(mlir::Operation *parentOp,
const mlir::Attribute attr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter,
mlir::DataLayout const &dataLayout) {
CirAttrToValue valueConverter(parentOp, rewriter, converter, dataLayout);
auto value = valueConverter.visit(attr);
if (!value)
llvm_unreachable("unhandled attribute type");
return value;
}
//===----------------------------------------------------------------------===//
mlir::LLVM::Linkage convertLinkage(cir::GlobalLinkageKind linkage) {
using CIR = cir::GlobalLinkageKind;
using LLVM = mlir::LLVM::Linkage;
switch (linkage) {
case CIR::AvailableExternallyLinkage:
return LLVM::AvailableExternally;
case CIR::CommonLinkage:
return LLVM::Common;
case CIR::ExternalLinkage:
return LLVM::External;
case CIR::ExternalWeakLinkage:
return LLVM::ExternWeak;
case CIR::InternalLinkage:
return LLVM::Internal;
case CIR::LinkOnceAnyLinkage:
return LLVM::Linkonce;
case CIR::LinkOnceODRLinkage:
return LLVM::LinkonceODR;
case CIR::PrivateLinkage:
return LLVM::Private;
case CIR::WeakAnyLinkage:
return LLVM::Weak;
case CIR::WeakODRLinkage:
return LLVM::WeakODR;
};
}
mlir::LLVM::CConv convertCallingConv(cir::CallingConv callinvConv) {
using CIR = cir::CallingConv;
using LLVM = mlir::LLVM::CConv;
switch (callinvConv) {
case CIR::C:
return LLVM::C;
case CIR::SpirKernel:
return LLVM::SPIR_KERNEL;
case CIR::SpirFunction:
return LLVM::SPIR_FUNC;
}
llvm_unreachable("Unknown calling convention");
}
void convertSideEffectForCall(mlir::Operation *callOp,
cir::SideEffect sideEffect,
mlir::LLVM::MemoryEffectsAttr &memoryEffect,
bool &noUnwind, bool &willReturn) {
using mlir::LLVM::ModRefInfo;
switch (sideEffect) {
case cir::SideEffect::All:
memoryEffect = {};
noUnwind = false;
willReturn = false;
break;
case cir::SideEffect::Pure:
memoryEffect = mlir::LLVM::MemoryEffectsAttr::get(
callOp->getContext(), /*other=*/ModRefInfo::Ref,
/*argMem=*/ModRefInfo::Ref,
/*inaccessibleMem=*/ModRefInfo::Ref);
noUnwind = true;
willReturn = true;
break;
case cir::SideEffect::Const:
memoryEffect = mlir::LLVM::MemoryEffectsAttr::get(
callOp->getContext(), /*other=*/ModRefInfo::NoModRef,
/*argMem=*/ModRefInfo::NoModRef,
/*inaccessibleMem=*/ModRefInfo::NoModRef);
noUnwind = true;
willReturn = true;
break;
}
}
mlir::LogicalResult CIRToLLVMCopyOpLowering::matchAndRewrite(
cir::CopyOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
const mlir::Value length = rewriter.create<mlir::LLVM::ConstantOp>(
op.getLoc(), rewriter.getI32Type(), op.getLength());
rewriter.replaceOpWithNewOp<mlir::LLVM::MemcpyOp>(
op, adaptor.getDst(), adaptor.getSrc(), length, op.getIsVolatile());
return mlir::success();
}
mlir::LogicalResult CIRToLLVMMemCpyOpLowering::matchAndRewrite(
cir::MemCpyOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
rewriter.replaceOpWithNewOp<mlir::LLVM::MemcpyOp>(
op, adaptor.getDst(), adaptor.getSrc(), adaptor.getLen(),
/*isVolatile=*/false);
return mlir::success();
}
mlir::LogicalResult CIRToLLVMMemChrOpLowering::matchAndRewrite(
cir::MemChrOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
auto llvmPtrTy = mlir::LLVM::LLVMPointerType::get(rewriter.getContext());
llvm::SmallVector<mlir::Type> arguments;
const mlir::TypeConverter *converter = getTypeConverter();
mlir::Type srcTy = converter->convertType(op.getSrc().getType());
mlir::Type patternTy = converter->convertType(op.getPattern().getType());
mlir::Type lenTy = converter->convertType(op.getLen().getType());
auto fnTy =
mlir::LLVM::LLVMFunctionType::get(llvmPtrTy, {srcTy, patternTy, lenTy},
/*isVarArg=*/false);
llvm::StringRef fnName = "memchr";
getOrCreateLLVMFuncOp(rewriter, op, fnName, fnTy);
rewriter.replaceOpWithNewOp<mlir::LLVM::CallOp>(
op, mlir::TypeRange{llvmPtrTy}, fnName,
mlir::ValueRange{adaptor.getSrc(), adaptor.getPattern(),
adaptor.getLen()});
return mlir::success();
}
mlir::LogicalResult CIRToLLVMMemMoveOpLowering::matchAndRewrite(
cir::MemMoveOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
rewriter.replaceOpWithNewOp<mlir::LLVM::MemmoveOp>(
op, adaptor.getDst(), adaptor.getSrc(), adaptor.getLen(),
/*isVolatile=*/false);
return mlir::success();
}
mlir::LogicalResult CIRToLLVMMemCpyInlineOpLowering::matchAndRewrite(
cir::MemCpyInlineOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
rewriter.replaceOpWithNewOp<mlir::LLVM::MemcpyInlineOp>(
op, adaptor.getDst(), adaptor.getSrc(), adaptor.getLenAttr(),
/*isVolatile=*/false);
return mlir::success();
}
mlir::LogicalResult CIRToLLVMMemSetOpLowering::matchAndRewrite(
cir::MemSetOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
auto converted = rewriter.create<mlir::LLVM::TruncOp>(
op.getLoc(), mlir::IntegerType::get(op.getContext(), 8),
adaptor.getVal());
rewriter.replaceOpWithNewOp<mlir::LLVM::MemsetOp>(op, adaptor.getDst(),
converted, adaptor.getLen(),
/*isVolatile=*/false);
return mlir::success();
}
mlir::LogicalResult CIRToLLVMMemSetInlineOpLowering::matchAndRewrite(
cir::MemSetInlineOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
auto converted = rewriter.create<mlir::LLVM::TruncOp>(
op.getLoc(), mlir::IntegerType::get(op.getContext(), 8),
adaptor.getVal());
rewriter.replaceOpWithNewOp<mlir::LLVM::MemsetInlineOp>(
op, adaptor.getDst(), converted, adaptor.getLenAttr(),
/*isVolatile=*/false);
return mlir::success();
}
static mlir::Value getLLVMIntCast(mlir::ConversionPatternRewriter &rewriter,
mlir::Value llvmSrc, mlir::Type llvmDstIntTy,
bool isUnsigned, uint64_t cirSrcWidth,
uint64_t cirDstIntWidth) {
if (cirSrcWidth == cirDstIntWidth)
return llvmSrc;
auto loc = llvmSrc.getLoc();
if (cirSrcWidth < cirDstIntWidth) {
if (isUnsigned)
return rewriter.create<mlir::LLVM::ZExtOp>(loc, llvmDstIntTy, llvmSrc);
return rewriter.create<mlir::LLVM::SExtOp>(loc, llvmDstIntTy, llvmSrc);
}
// Otherwise truncate
return rewriter.create<mlir::LLVM::TruncOp>(loc, llvmDstIntTy, llvmSrc);
}
mlir::LogicalResult CIRToLLVMPtrStrideOpLowering::matchAndRewrite(
cir::PtrStrideOp ptrStrideOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
auto *tc = getTypeConverter();
const auto resultTy = tc->convertType(ptrStrideOp.getType());
auto elementTy =
convertTypeForMemory(*tc, dataLayout, ptrStrideOp.getElementTy());
auto *ctx = elementTy.getContext();
// void and function types doesn't really have a layout to use in GEPs,
// make it i8 instead.
if (mlir::isa<mlir::LLVM::LLVMVoidType>(elementTy) ||
mlir::isa<mlir::LLVM::LLVMFunctionType>(elementTy))
elementTy = mlir::IntegerType::get(elementTy.getContext(), 8,
mlir::IntegerType::Signless);
// Zero-extend, sign-extend or trunc the pointer value.
auto index = adaptor.getStride();
auto width = mlir::cast<mlir::IntegerType>(index.getType()).getWidth();
mlir::DataLayout LLVMLayout(ptrStrideOp->getParentOfType<mlir::ModuleOp>());
auto layoutWidth =
LLVMLayout.getTypeIndexBitwidth(adaptor.getBase().getType());
auto indexOp = index.getDefiningOp();
if (indexOp && layoutWidth && width != *layoutWidth) {
// If the index comes from a subtraction, make sure the extension happens
// before it. To achieve that, look at unary minus, which already got
// lowered to "sub 0, x".
auto sub = dyn_cast<mlir::LLVM::SubOp>(indexOp);
auto unary = dyn_cast_if_present<cir::UnaryOp>(
ptrStrideOp.getStride().getDefiningOp());
bool rewriteSub =
unary && unary.getKind() == cir::UnaryOpKind::Minus && sub;
if (rewriteSub)
index = indexOp->getOperand(1);
// Handle the cast
auto llvmDstType = mlir::IntegerType::get(ctx, *layoutWidth);
index = getLLVMIntCast(rewriter, index, llvmDstType,
ptrStrideOp.getStride().getType().isUnsigned(),
width, *layoutWidth);
// Rewrite the sub in front of extensions/trunc
if (rewriteSub) {
index = rewriter.create<mlir::LLVM::SubOp>(
index.getLoc(), index.getType(),
rewriter.create<mlir::LLVM::ConstantOp>(
index.getLoc(), index.getType(),
mlir::IntegerAttr::get(index.getType(), 0)),
index);
rewriter.eraseOp(sub);
}
}
rewriter.replaceOpWithNewOp<mlir::LLVM::GEPOp>(
ptrStrideOp, resultTy, elementTy, adaptor.getBase(), index);
return mlir::success();
}
mlir::LogicalResult CIRToLLVMBaseClassAddrOpLowering::matchAndRewrite(
cir::BaseClassAddrOp baseClassOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
const auto resultType =
getTypeConverter()->convertType(baseClassOp.getType());
mlir::Value derivedAddr = adaptor.getDerivedAddr();
llvm::SmallVector<mlir::LLVM::GEPArg, 1> offset = {
adaptor.getOffset().getZExtValue()};
mlir::Type byteType = mlir::IntegerType::get(resultType.getContext(), 8,
mlir::IntegerType::Signless);
if (adaptor.getOffset().getZExtValue() == 0) {
rewriter.replaceOpWithNewOp<mlir::LLVM::BitcastOp>(
baseClassOp, resultType, adaptor.getDerivedAddr());
return mlir::success();
}
if (baseClassOp.getAssumeNotNull()) {
rewriter.replaceOpWithNewOp<mlir::LLVM::GEPOp>(
baseClassOp, resultType, byteType, derivedAddr, offset);
} else {
auto loc = baseClassOp.getLoc();
mlir::Value isNull = rewriter.create<mlir::LLVM::ICmpOp>(
loc, mlir::LLVM::ICmpPredicate::eq, derivedAddr,
rewriter.create<mlir::LLVM::ZeroOp>(loc, derivedAddr.getType()));
mlir::Value adjusted = rewriter.create<mlir::LLVM::GEPOp>(
loc, resultType, byteType, derivedAddr, offset);
rewriter.replaceOpWithNewOp<mlir::LLVM::SelectOp>(baseClassOp, isNull,
derivedAddr, adjusted);
}
return mlir::success();
}
mlir::LogicalResult CIRToLLVMDerivedClassAddrOpLowering::matchAndRewrite(
cir::DerivedClassAddrOp derivedClassOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const {
const auto resultType =
getTypeConverter()->convertType(derivedClassOp.getType());
mlir::Value baseAddr = adaptor.getBaseAddr();
int64_t offsetVal = adaptor.getOffset().getZExtValue() * -1;
llvm::SmallVector<mlir::LLVM::GEPArg, 1> offset = {offsetVal};
mlir::Type byteType = mlir::IntegerType::get(resultType.getContext(), 8,
mlir::IntegerType::Signless);
if (derivedClassOp.getAssumeNotNull()) {
rewriter.replaceOpWithNewOp<mlir::LLVM::GEPOp>(derivedClassOp, resultType,
byteType, baseAddr, offset);