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llvm-project/mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
Fangrui Song 4913e5da3c [mlir] std::optional::value => operator*/operator-> 
value() has undesired exception checking semantics and calls
__throw_bad_optional_access in libc++. Moreover, the API is unavailable without
_LIBCPP_NO_EXCEPTIONS on older Mach-O platforms (see
_LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS).
2022-12-17 04:38:27 +00:00

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//===- ConvertFromLLVMIR.cpp - MLIR to LLVM IR conversion -----------------===//
//
// 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 a translation between LLVM IR and the MLIR LLVM dialect.
//
//===----------------------------------------------------------------------===//
#include "DebugImporter.h"
#include "mlir/Target/LLVMIR/Import.h"
#include "mlir/Dialect/DLTI/DLTI.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/MLIRContext.h"
#include "mlir/IR/Matchers.h"
#include "mlir/Interfaces/DataLayoutInterfaces.h"
#include "mlir/Target/LLVMIR/TypeFromLLVM.h"
#include "mlir/Tools/mlir-translate/Translation.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/TypeSwitch.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/Type.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/SourceMgr.h"
using namespace mlir;
using namespace mlir::LLVM;
using mlir::LLVM::detail::DebugImporter;
#include "mlir/Dialect/LLVMIR/LLVMConversionEnumsFromLLVM.inc"
/// Returns true if the LLVM IR intrinsic is convertible to an MLIR LLVM dialect
/// intrinsic, or false if no counterpart exists.
static bool isConvertibleIntrinsic(llvm::Intrinsic::ID id) {
static const DenseSet<unsigned> convertibleIntrinsics = {
#include "mlir/Dialect/LLVMIR/LLVMConvertibleLLVMIRIntrinsics.inc"
};
return convertibleIntrinsics.contains(id);
}
// Utility to print an LLVM value as a string for passing to emitError().
// FIXME: Diagnostic should be able to natively handle types that have
// operator << (raw_ostream&) defined.
static std::string diag(llvm::Value &value) {
std::string str;
llvm::raw_string_ostream os(str);
os << value;
return os.str();
}
/// Creates an attribute containing ABI and preferred alignment numbers parsed
/// a string. The string may be either "abi:preferred" or just "abi". In the
/// latter case, the prefrred alignment is considered equal to ABI alignment.
static DenseIntElementsAttr parseDataLayoutAlignment(MLIRContext &ctx,
StringRef spec) {
auto i32 = IntegerType::get(&ctx, 32);
StringRef abiString, preferredString;
std::tie(abiString, preferredString) = spec.split(':');
int abi, preferred;
if (abiString.getAsInteger(/*Radix=*/10, abi))
return nullptr;
if (preferredString.empty())
preferred = abi;
else if (preferredString.getAsInteger(/*Radix=*/10, preferred))
return nullptr;
return DenseIntElementsAttr::get(VectorType::get({2}, i32), {abi, preferred});
}
/// Returns a supported MLIR floating point type of the given bit width or null
/// if the bit width is not supported.
static FloatType getDLFloatType(MLIRContext &ctx, int32_t bitwidth) {
switch (bitwidth) {
case 16:
return FloatType::getF16(&ctx);
case 32:
return FloatType::getF32(&ctx);
case 64:
return FloatType::getF64(&ctx);
case 80:
return FloatType::getF80(&ctx);
case 128:
return FloatType::getF128(&ctx);
default:
return nullptr;
}
}
static ICmpPredicate getICmpPredicate(llvm::CmpInst::Predicate pred) {
switch (pred) {
default:
llvm_unreachable("incorrect comparison predicate");
case llvm::CmpInst::Predicate::ICMP_EQ:
return LLVM::ICmpPredicate::eq;
case llvm::CmpInst::Predicate::ICMP_NE:
return LLVM::ICmpPredicate::ne;
case llvm::CmpInst::Predicate::ICMP_SLT:
return LLVM::ICmpPredicate::slt;
case llvm::CmpInst::Predicate::ICMP_SLE:
return LLVM::ICmpPredicate::sle;
case llvm::CmpInst::Predicate::ICMP_SGT:
return LLVM::ICmpPredicate::sgt;
case llvm::CmpInst::Predicate::ICMP_SGE:
return LLVM::ICmpPredicate::sge;
case llvm::CmpInst::Predicate::ICMP_ULT:
return LLVM::ICmpPredicate::ult;
case llvm::CmpInst::Predicate::ICMP_ULE:
return LLVM::ICmpPredicate::ule;
case llvm::CmpInst::Predicate::ICMP_UGT:
return LLVM::ICmpPredicate::ugt;
case llvm::CmpInst::Predicate::ICMP_UGE:
return LLVM::ICmpPredicate::uge;
}
llvm_unreachable("incorrect integer comparison predicate");
}
static FCmpPredicate getFCmpPredicate(llvm::CmpInst::Predicate pred) {
switch (pred) {
default:
llvm_unreachable("incorrect comparison predicate");
case llvm::CmpInst::Predicate::FCMP_FALSE:
return LLVM::FCmpPredicate::_false;
case llvm::CmpInst::Predicate::FCMP_TRUE:
return LLVM::FCmpPredicate::_true;
case llvm::CmpInst::Predicate::FCMP_OEQ:
return LLVM::FCmpPredicate::oeq;
case llvm::CmpInst::Predicate::FCMP_ONE:
return LLVM::FCmpPredicate::one;
case llvm::CmpInst::Predicate::FCMP_OLT:
return LLVM::FCmpPredicate::olt;
case llvm::CmpInst::Predicate::FCMP_OLE:
return LLVM::FCmpPredicate::ole;
case llvm::CmpInst::Predicate::FCMP_OGT:
return LLVM::FCmpPredicate::ogt;
case llvm::CmpInst::Predicate::FCMP_OGE:
return LLVM::FCmpPredicate::oge;
case llvm::CmpInst::Predicate::FCMP_ORD:
return LLVM::FCmpPredicate::ord;
case llvm::CmpInst::Predicate::FCMP_ULT:
return LLVM::FCmpPredicate::ult;
case llvm::CmpInst::Predicate::FCMP_ULE:
return LLVM::FCmpPredicate::ule;
case llvm::CmpInst::Predicate::FCMP_UGT:
return LLVM::FCmpPredicate::ugt;
case llvm::CmpInst::Predicate::FCMP_UGE:
return LLVM::FCmpPredicate::uge;
case llvm::CmpInst::Predicate::FCMP_UNO:
return LLVM::FCmpPredicate::uno;
case llvm::CmpInst::Predicate::FCMP_UEQ:
return LLVM::FCmpPredicate::ueq;
case llvm::CmpInst::Predicate::FCMP_UNE:
return LLVM::FCmpPredicate::une;
}
llvm_unreachable("incorrect floating point comparison predicate");
}
static AtomicOrdering getLLVMAtomicOrdering(llvm::AtomicOrdering ordering) {
switch (ordering) {
case llvm::AtomicOrdering::NotAtomic:
return LLVM::AtomicOrdering::not_atomic;
case llvm::AtomicOrdering::Unordered:
return LLVM::AtomicOrdering::unordered;
case llvm::AtomicOrdering::Monotonic:
return LLVM::AtomicOrdering::monotonic;
case llvm::AtomicOrdering::Acquire:
return LLVM::AtomicOrdering::acquire;
case llvm::AtomicOrdering::Release:
return LLVM::AtomicOrdering::release;
case llvm::AtomicOrdering::AcquireRelease:
return LLVM::AtomicOrdering::acq_rel;
case llvm::AtomicOrdering::SequentiallyConsistent:
return LLVM::AtomicOrdering::seq_cst;
}
llvm_unreachable("incorrect atomic ordering");
}
static AtomicBinOp getLLVMAtomicBinOp(llvm::AtomicRMWInst::BinOp binOp) {
switch (binOp) {
case llvm::AtomicRMWInst::Xchg:
return LLVM::AtomicBinOp::xchg;
case llvm::AtomicRMWInst::Add:
return LLVM::AtomicBinOp::add;
case llvm::AtomicRMWInst::Sub:
return LLVM::AtomicBinOp::sub;
case llvm::AtomicRMWInst::And:
return LLVM::AtomicBinOp::_and;
case llvm::AtomicRMWInst::Nand:
return LLVM::AtomicBinOp::nand;
case llvm::AtomicRMWInst::Or:
return LLVM::AtomicBinOp::_or;
case llvm::AtomicRMWInst::Xor:
return LLVM::AtomicBinOp::_xor;
case llvm::AtomicRMWInst::Max:
return LLVM::AtomicBinOp::max;
case llvm::AtomicRMWInst::Min:
return LLVM::AtomicBinOp::min;
case llvm::AtomicRMWInst::UMax:
return LLVM::AtomicBinOp::umax;
case llvm::AtomicRMWInst::UMin:
return LLVM::AtomicBinOp::umin;
case llvm::AtomicRMWInst::FAdd:
return LLVM::AtomicBinOp::fadd;
case llvm::AtomicRMWInst::FSub:
return LLVM::AtomicBinOp::fsub;
default:
llvm_unreachable("unsupported atomic binary operation");
}
}
/// Converts the sync scope identifier of `fenceInst` to the string
/// representation necessary to build the LLVM dialect fence operation.
static StringRef getLLVMSyncScope(llvm::FenceInst *fenceInst) {
llvm::LLVMContext &llvmContext = fenceInst->getContext();
SmallVector<StringRef> syncScopeNames;
llvmContext.getSyncScopeNames(syncScopeNames);
for (StringRef name : syncScopeNames)
if (fenceInst->getSyncScopeID() == llvmContext.getOrInsertSyncScopeID(name))
return name;
llvm_unreachable("incorrect sync scope identifier");
}
/// Converts an array of unsigned indices to a signed integer position array.
static SmallVector<int64_t> getPositionFromIndices(ArrayRef<unsigned> indices) {
SmallVector<int64_t> position;
llvm::append_range(position, indices);
return position;
}
DataLayoutSpecInterface
mlir::translateDataLayout(const llvm::DataLayout &dataLayout,
MLIRContext *context) {
assert(context && "expected MLIR context");
std::string layoutstr = dataLayout.getStringRepresentation();
// Remaining unhandled default layout defaults
// e (little endian if not set)
// p[n]:64:64:64 (non zero address spaces have 64-bit properties)
std::string append =
"p:64:64:64-S0-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f16:16:16-f64:"
"64:64-f128:128:128-v64:64:64-v128:128:128-a:0:64";
if (layoutstr.empty())
layoutstr = append;
else
layoutstr = layoutstr + "-" + append;
StringRef layout(layoutstr);
SmallVector<DataLayoutEntryInterface> entries;
StringSet<> seen;
while (!layout.empty()) {
// Split at '-'.
std::pair<StringRef, StringRef> split = layout.split('-');
StringRef current;
std::tie(current, layout) = split;
// Split at ':'.
StringRef kind, spec;
std::tie(kind, spec) = current.split(':');
if (seen.contains(kind))
continue;
seen.insert(kind);
char symbol = kind.front();
StringRef parameter = kind.substr(1);
if (symbol == 'i' || symbol == 'f') {
unsigned bitwidth;
if (parameter.getAsInteger(/*Radix=*/10, bitwidth))
return nullptr;
DenseIntElementsAttr params = parseDataLayoutAlignment(*context, spec);
if (!params)
return nullptr;
auto entry = DataLayoutEntryAttr::get(
symbol == 'i' ? static_cast<Type>(IntegerType::get(context, bitwidth))
: getDLFloatType(*context, bitwidth),
params);
entries.emplace_back(entry);
} else if (symbol == 'e' || symbol == 'E') {
auto value = StringAttr::get(
context, symbol == 'e' ? DLTIDialect::kDataLayoutEndiannessLittle
: DLTIDialect::kDataLayoutEndiannessBig);
auto entry = DataLayoutEntryAttr::get(
StringAttr::get(context, DLTIDialect::kDataLayoutEndiannessKey),
value);
entries.emplace_back(entry);
}
}
return DataLayoutSpecAttr::get(context, entries);
}
/// Get a topologically sorted list of blocks for the given function.
static SetVector<llvm::BasicBlock *>
getTopologicallySortedBlocks(llvm::Function *func) {
SetVector<llvm::BasicBlock *> blocks;
for (llvm::BasicBlock &bb : *func) {
if (blocks.count(&bb) == 0) {
llvm::ReversePostOrderTraversal<llvm::BasicBlock *> traversal(&bb);
blocks.insert(traversal.begin(), traversal.end());
}
}
assert(blocks.size() == func->size() && "some blocks are not sorted");
return blocks;
}
namespace {
/// Module import implementation class that provides methods to import globals
/// and functions from an LLVM module into an MLIR module. It holds mappings
/// between the original and translated globals, basic blocks, and values used
/// during the translation. Additionally, it keeps track of the current constant
/// insertion point since LLVM immediate values translate to MLIR operations
/// that are introduced at the beginning of the region.
class Importer {
public:
Importer(MLIRContext *context, ModuleOp module)
: builder(context), context(context), module(module),
typeTranslator(*context), debugImporter(context) {
builder.setInsertionPointToStart(module.getBody());
}
/// Stores the mapping between an LLVM value and its MLIR counterpart.
void mapValue(llvm::Value *llvm, Value mlir) { mapValue(llvm) = mlir; }
/// Provides write-once access to store the MLIR value corresponding to the
/// given LLVM value.
Value &mapValue(llvm::Value *value) {
Value &mlir = valueMapping[value];
assert(mlir == nullptr &&
"attempting to map a value that is already mapped");
return mlir;
}
/// Returns the MLIR value mapped to the given LLVM value.
Value lookupValue(llvm::Value *value) { return valueMapping.lookup(value); }
/// Stores the mapping between an LLVM block and its MLIR counterpart.
void mapBlock(llvm::BasicBlock *llvm, Block *mlir) {
auto result = blockMapping.try_emplace(llvm, mlir);
(void)result;
assert(result.second && "attempting to map a block that is already mapped");
}
/// Returns the MLIR block mapped to the given LLVM block.
Block *lookupBlock(llvm::BasicBlock *block) const {
return blockMapping.lookup(block);
}
/// Converts an LLVM value to an MLIR value, or returns failure if the
/// conversion fails. Uses the `convertConstant` method to translate constant
/// LLVM values.
FailureOr<Value> convertValue(llvm::Value *value);
/// Converts a range of LLVM values to a range of MLIR values using the
/// `convertValue` method, or returns failure if the conversion fails.
FailureOr<SmallVector<Value>> convertValues(ArrayRef<llvm::Value *> values);
/// Converts `value` to an integer attribute. Asserts if the matching fails.
IntegerAttr matchIntegerAttr(llvm::Value *value);
/// Converts `value` to a local variable attribute. Asserts if the matching
/// fails.
DILocalVariableAttr matchLocalVariableAttr(llvm::Value *value);
/// Translates the debug location.
Location translateLoc(llvm::DILocation *loc) {
return debugImporter.translateLoc(loc);
}
/// Converts the type from LLVM to MLIR LLVM dialect.
Type convertType(llvm::Type *type) {
return typeTranslator.translateType(type);
}
/// Converts an LLVM intrinsic to an MLIR LLVM dialect operation if an MLIR
/// counterpart exists. Otherwise, returns failure.
LogicalResult convertIntrinsic(OpBuilder &odsBuilder, llvm::CallInst *inst,
llvm::Intrinsic::ID intrinsicID);
/// Converts an LLVM instruction to an MLIR LLVM dialect operation if an MLIR
/// counterpart exists. Otherwise, returns failure.
LogicalResult convertOperation(OpBuilder &odsBuilder,
llvm::Instruction *inst);
/// Imports `func` into the current module.
LogicalResult processFunction(llvm::Function *func);
/// Converts function attributes of LLVM Function \p func
/// into LLVM dialect attributes of LLVMFuncOp \p funcOp.
void processFunctionAttributes(llvm::Function *func, LLVMFuncOp funcOp);
/// Imports `globalVar` as a GlobalOp, creating it if it doesn't exist.
GlobalOp processGlobal(llvm::GlobalVariable *globalVar);
private:
/// Clears the block and value mapping before processing a new region.
void clearBlockAndValueMapping() {
valueMapping.clear();
blockMapping.clear();
}
/// Sets the constant insertion point to the start of the given block.
void setConstantInsertionPointToStart(Block *block) {
constantInsertionBlock = block;
constantInsertionOp = nullptr;
}
/// Sets the fastmath flags attribute for the imported operation `op` given
/// the original instruction `inst`. Asserts if the operation does not
/// implement the fastmath interface.
void setFastmathFlagsAttr(llvm::Instruction *inst, Operation *op) const;
/// Returns personality of `func` as a FlatSymbolRefAttr.
FlatSymbolRefAttr getPersonalityAsAttr(llvm::Function *func);
/// Imports `bb` into `block`, which must be initially empty.
LogicalResult processBasicBlock(llvm::BasicBlock *bb, Block *block);
/// Imports `inst` and populates valueMapping[inst] with the result of the
/// imported operation.
LogicalResult processInstruction(llvm::Instruction *inst);
/// Converts the `branch` arguments in the order of the phi's found in
/// `target` and appends them to the `blockArguments` to attach to the
/// generated branch operation. The `blockArguments` thus have the same order
/// as the phi's in `target`.
LogicalResult convertBranchArgs(llvm::Instruction *branch,
llvm::BasicBlock *target,
SmallVectorImpl<Value> &blockArguments);
/// Appends the converted result type and operands of `callInst` to the
/// `types` and `operands` arrays. For indirect calls, the method additionally
/// inserts the called function at the beginning of the `operands` array.
LogicalResult convertCallTypeAndOperands(llvm::CallBase *callInst,
SmallVectorImpl<Type> &types,
SmallVectorImpl<Value> &operands);
/// Returns the builtin type equivalent to be used in attributes for the given
/// LLVM IR dialect type.
Type getStdTypeForAttr(Type type);
/// Returns `value` as an attribute to attach to a GlobalOp.
Attribute getConstantAsAttr(llvm::Constant *value);
/// Returns the topologically sorted set of transitive dependencies needed to
/// convert the given constant.
SetVector<llvm::Constant *> getConstantsToConvert(llvm::Constant *constant);
/// Converts an LLVM constant to an MLIR value, or returns failure if the
/// conversion fails. The MLIR value may be produced by a ConstantOp,
/// AddressOfOp, NullOp, or a side-effect free operation (for ConstantExprs or
/// ConstantGEPs).
FailureOr<Value> convertConstant(llvm::Constant *constant);
/// Converts an LLVM constant and its transitive constant dependencies to MLIR
/// operations by converting them in topological order using the
/// `convertConstant` method, or returns failure if the conversion of any of
/// them fails. All operations are inserted at the start of the current
/// function entry block.
FailureOr<Value> convertConstantExpr(llvm::Constant *constant);
/// Builder pointing at where the next instruction should be generated.
OpBuilder builder;
/// Block to insert the next constant into.
Block *constantInsertionBlock = nullptr;
/// Operation to insert the next constant after.
Operation *constantInsertionOp = nullptr;
/// Operation to insert the next global after.
Operation *globalInsertionOp = nullptr;
/// The current context.
MLIRContext *context;
/// The current module being created.
ModuleOp module;
/// Function-local mapping between original and imported block.
DenseMap<llvm::BasicBlock *, Block *> blockMapping;
/// Function-local mapping between original and imported values.
DenseMap<llvm::Value *, Value> valueMapping;
/// Uniquing map of GlobalVariables.
DenseMap<llvm::GlobalVariable *, GlobalOp> globals;
/// The stateful type translator (contains named structs).
LLVM::TypeFromLLVMIRTranslator typeTranslator;
/// Stateful debug information importer.
DebugImporter debugImporter;
};
} // namespace
void Importer::setFastmathFlagsAttr(llvm::Instruction *inst,
Operation *op) const {
auto iface = cast<FastmathFlagsInterface>(op);
// Even if the imported operation implements the fastmath interface, the
// original instruction may not have fastmath flags set. Exit if an
// instruction, such as a non floating-point function call, does not have
// fastmath flags.
if (!isa<llvm::FPMathOperator>(inst))
return;
llvm::FastMathFlags flags = inst->getFastMathFlags();
// Set the fastmath bits flag-by-flag.
FastmathFlags value = {};
value = bitEnumSet(value, FastmathFlags::nnan, flags.noNaNs());
value = bitEnumSet(value, FastmathFlags::ninf, flags.noInfs());
value = bitEnumSet(value, FastmathFlags::nsz, flags.noSignedZeros());
value = bitEnumSet(value, FastmathFlags::arcp, flags.allowReciprocal());
value = bitEnumSet(value, FastmathFlags::contract, flags.allowContract());
value = bitEnumSet(value, FastmathFlags::afn, flags.approxFunc());
value = bitEnumSet(value, FastmathFlags::reassoc, flags.allowReassoc());
FastmathFlagsAttr attr = FastmathFlagsAttr::get(builder.getContext(), value);
iface->setAttr(iface.getFastmathAttrName(), attr);
}
// We only need integers, floats, doubles, and vectors and tensors thereof for
// attributes. Scalar and vector types are converted to the standard
// equivalents. Array types are converted to ranked tensors; nested array types
// are converted to multi-dimensional tensors or vectors, depending on the
// innermost type being a scalar or a vector.
Type Importer::getStdTypeForAttr(Type type) {
if (!type)
return nullptr;
if (type.isa<IntegerType, FloatType>())
return type;
// LLVM vectors can only contain scalars.
if (LLVM::isCompatibleVectorType(type)) {
llvm::ElementCount numElements = LLVM::getVectorNumElements(type);
if (numElements.isScalable()) {
emitError(UnknownLoc::get(context)) << "scalable vectors not supported";
return nullptr;
}
Type elementType = getStdTypeForAttr(LLVM::getVectorElementType(type));
if (!elementType)
return nullptr;
return VectorType::get(numElements.getKnownMinValue(), elementType);
}
// LLVM arrays can contain other arrays or vectors.
if (auto arrayType = type.dyn_cast<LLVMArrayType>()) {
// Recover the nested array shape.
SmallVector<int64_t, 4> shape;
shape.push_back(arrayType.getNumElements());
while (arrayType.getElementType().isa<LLVMArrayType>()) {
arrayType = arrayType.getElementType().cast<LLVMArrayType>();
shape.push_back(arrayType.getNumElements());
}
// If the innermost type is a vector, use the multi-dimensional vector as
// attribute type.
if (LLVM::isCompatibleVectorType(arrayType.getElementType())) {
llvm::ElementCount numElements =
LLVM::getVectorNumElements(arrayType.getElementType());
if (numElements.isScalable()) {
emitError(UnknownLoc::get(context)) << "scalable vectors not supported";
return nullptr;
}
shape.push_back(numElements.getKnownMinValue());
Type elementType = getStdTypeForAttr(
LLVM::getVectorElementType(arrayType.getElementType()));
if (!elementType)
return nullptr;
return VectorType::get(shape, elementType);
}
// Otherwise use a tensor.
Type elementType = getStdTypeForAttr(arrayType.getElementType());
if (!elementType)
return nullptr;
return RankedTensorType::get(shape, elementType);
}
return nullptr;
}
// Get the given constant as an attribute. Not all constants can be represented
// as attributes.
Attribute Importer::getConstantAsAttr(llvm::Constant *value) {
if (auto *ci = dyn_cast<llvm::ConstantInt>(value))
return builder.getIntegerAttr(
IntegerType::get(context, ci->getType()->getBitWidth()),
ci->getValue());
if (auto *c = dyn_cast<llvm::ConstantDataArray>(value))
if (c->isString())
return builder.getStringAttr(c->getAsString());
if (auto *c = dyn_cast<llvm::ConstantFP>(value)) {
llvm::Type *type = c->getType();
FloatType floatTy;
if (type->isBFloatTy())
floatTy = FloatType::getBF16(context);
else
floatTy = getDLFloatType(*context, type->getScalarSizeInBits());
assert(floatTy && "unsupported floating point type");
return builder.getFloatAttr(floatTy, c->getValueAPF());
}
if (auto *f = dyn_cast<llvm::Function>(value))
return SymbolRefAttr::get(builder.getContext(), f->getName());
// Convert constant data to a dense elements attribute.
if (auto *cd = dyn_cast<llvm::ConstantDataSequential>(value)) {
Type type = convertType(cd->getElementType());
auto attrType = getStdTypeForAttr(convertType(cd->getType()))
.dyn_cast_or_null<ShapedType>();
if (!attrType)
return nullptr;
if (type.isa<IntegerType>()) {
SmallVector<APInt, 8> values;
values.reserve(cd->getNumElements());
for (unsigned i = 0, e = cd->getNumElements(); i < e; ++i)
values.push_back(cd->getElementAsAPInt(i));
return DenseElementsAttr::get(attrType, values);
}
if (type.isa<Float32Type, Float64Type>()) {
SmallVector<APFloat, 8> values;
values.reserve(cd->getNumElements());
for (unsigned i = 0, e = cd->getNumElements(); i < e; ++i)
values.push_back(cd->getElementAsAPFloat(i));
return DenseElementsAttr::get(attrType, values);
}
return nullptr;
}
// Unpack constant aggregates to create dense elements attribute whenever
// possible. Return nullptr (failure) otherwise.
if (isa<llvm::ConstantAggregate>(value)) {
auto outerType = getStdTypeForAttr(convertType(value->getType()))
.dyn_cast_or_null<ShapedType>();
if (!outerType)
return nullptr;
SmallVector<Attribute, 8> values;
SmallVector<int64_t, 8> shape;
for (unsigned i = 0, e = value->getNumOperands(); i < e; ++i) {
auto nested = getConstantAsAttr(value->getAggregateElement(i))
.dyn_cast_or_null<DenseElementsAttr>();
if (!nested)
return nullptr;
values.append(nested.value_begin<Attribute>(),
nested.value_end<Attribute>());
}
return DenseElementsAttr::get(outerType, values);
}
return nullptr;
}
GlobalOp Importer::processGlobal(llvm::GlobalVariable *globalVar) {
if (globals.count(globalVar))
return globals[globalVar];
// Insert the global after the last one or at the start of the module.
OpBuilder::InsertionGuard guard(builder);
if (!globalInsertionOp) {
builder.setInsertionPointToStart(module.getBody());
} else {
builder.setInsertionPointAfter(globalInsertionOp);
}
Attribute valueAttr;
if (globalVar->hasInitializer())
valueAttr = getConstantAsAttr(globalVar->getInitializer());
Type type = convertType(globalVar->getValueType());
uint64_t alignment = 0;
llvm::MaybeAlign maybeAlign = globalVar->getAlign();
if (maybeAlign.has_value()) {
llvm::Align align = *maybeAlign;
alignment = align.value();
}
GlobalOp globalOp = builder.create<GlobalOp>(
UnknownLoc::get(context), type, globalVar->isConstant(),
convertLinkageFromLLVM(globalVar->getLinkage()), globalVar->getName(),
valueAttr, alignment, /*addr_space=*/globalVar->getAddressSpace(),
/*dso_local=*/globalVar->isDSOLocal(),
/*thread_local=*/globalVar->isThreadLocal());
globalInsertionOp = globalOp;
if (globalVar->hasInitializer() && !valueAttr) {
clearBlockAndValueMapping();
Block *block = builder.createBlock(&globalOp.getInitializerRegion());
setConstantInsertionPointToStart(block);
FailureOr<Value> initializer =
convertConstantExpr(globalVar->getInitializer());
if (failed(initializer))
return {};
builder.create<ReturnOp>(globalOp.getLoc(), initializer.value());
}
if (globalVar->hasAtLeastLocalUnnamedAddr()) {
globalOp.setUnnamedAddr(
convertUnnamedAddrFromLLVM(globalVar->getUnnamedAddr()));
}
if (globalVar->hasSection())
globalOp.setSection(globalVar->getSection());
return globals[globalVar] = globalOp;
}
SetVector<llvm::Constant *>
Importer::getConstantsToConvert(llvm::Constant *constant) {
// Traverse the constant dependencies in post order.
SmallVector<llvm::Constant *> workList;
SmallVector<llvm::Constant *> orderedList;
workList.push_back(constant);
while (!workList.empty()) {
llvm::Constant *current = workList.pop_back_val();
// Skip constants that have been converted before and store all other ones.
if (valueMapping.count(current))
continue;
orderedList.push_back(current);
// Add the current constant's dependencies to the work list. Only add
// constant dependencies and skip any other values such as basic block
// addresses.
for (llvm::Value *operand : current->operands())
if (auto *constDependency = dyn_cast<llvm::Constant>(operand))
workList.push_back(constDependency);
// Use the `getElementValue` method to add the dependencies of zero
// initialized aggregate constants since they do not take any operands.
if (auto *constAgg = dyn_cast<llvm::ConstantAggregateZero>(current)) {
unsigned numElements = constAgg->getElementCount().getFixedValue();
for (unsigned i = 0, e = numElements; i != e; ++i)
workList.push_back(constAgg->getElementValue(i));
}
}
// Add the constants in reverse post order to the result set to ensure all
// dependencies are satisfied. Avoid storing duplicates since LLVM constants
// are uniqued and only one `valueMapping` entry per constant is possible.
SetVector<llvm::Constant *> orderedSet;
for (llvm::Constant *orderedConst : llvm::reverse(orderedList))
orderedSet.insert(orderedConst);
return orderedSet;
}
FailureOr<Value> Importer::convertConstant(llvm::Constant *constant) {
// Constants have no location attached.
Location loc = UnknownLoc::get(context);
// Convert constants that can be represented as attributes.
if (Attribute attr = getConstantAsAttr(constant)) {
Type type = convertType(constant->getType());
if (auto symbolRef = attr.dyn_cast<FlatSymbolRefAttr>()) {
return builder.create<AddressOfOp>(loc, type, symbolRef.getValue())
.getResult();
}
return builder.create<ConstantOp>(loc, type, attr).getResult();
}
// Convert null pointer constants.
if (auto *nullPtr = dyn_cast<llvm::ConstantPointerNull>(constant)) {
Type type = convertType(nullPtr->getType());
return builder.create<NullOp>(loc, type).getResult();
}
// Convert undef.
if (auto *undefVal = dyn_cast<llvm::UndefValue>(constant)) {
Type type = convertType(undefVal->getType());
return builder.create<UndefOp>(loc, type).getResult();
}
// Convert global variable accesses.
if (auto *globalVar = dyn_cast<llvm::GlobalVariable>(constant)) {
return builder.create<AddressOfOp>(loc, processGlobal(globalVar))
.getResult();
}
// Convert constant expressions.
if (auto *constExpr = dyn_cast<llvm::ConstantExpr>(constant)) {
// Convert the constant expression to a temporary LLVM instruction and
// translate it using the `processInstruction` method. Delete the
// instruction after the translation and remove it from `valueMapping`,
// since later calls to `getAsInstruction` may return the same address
// resulting in a conflicting `valueMapping` entry.
llvm::Instruction *inst = constExpr->getAsInstruction();
auto guard = llvm::make_scope_exit([&]() {
valueMapping.erase(inst);
inst->deleteValue();
});
// Note: `processInstruction` does not call `convertConstant` recursively
// since all constant dependencies have been converted before.
assert(llvm::all_of(inst->operands(), [&](llvm::Value *value) {
return valueMapping.count(value);
}));
if (failed(processInstruction(inst)))
return failure();
return lookupValue(inst);
}
// Convert aggregate constants.
if (isa<llvm::ConstantAggregate>(constant) ||
isa<llvm::ConstantAggregateZero>(constant)) {
// Lookup the aggregate elements that have been converted before.
SmallVector<Value> elementValues;
if (auto *constAgg = dyn_cast<llvm::ConstantAggregate>(constant)) {
elementValues.reserve(constAgg->getNumOperands());
for (llvm::Value *operand : constAgg->operands())
elementValues.push_back(lookupValue(operand));
}
if (auto *constAgg = dyn_cast<llvm::ConstantAggregateZero>(constant)) {
unsigned numElements = constAgg->getElementCount().getFixedValue();
elementValues.reserve(numElements);
for (unsigned i = 0, e = numElements; i != e; ++i)
elementValues.push_back(lookupValue(constAgg->getElementValue(i)));
}
assert(llvm::count(elementValues, nullptr) == 0 &&
"expected all elements have been converted before");
// Generate an UndefOp as root value and insert the aggregate elements.
Type rootType = convertType(constant->getType());
bool isArrayOrStruct = rootType.isa<LLVMArrayType, LLVMStructType>();
assert((isArrayOrStruct || LLVM::isCompatibleVectorType(rootType)) &&
"unrecognized aggregate type");
Value root = builder.create<UndefOp>(loc, rootType);
for (const auto &it : llvm::enumerate(elementValues)) {
if (isArrayOrStruct) {
root = builder.create<InsertValueOp>(loc, root, it.value(), it.index());
} else {
Attribute indexAttr = builder.getI32IntegerAttr(it.index());
Value indexValue =
builder.create<ConstantOp>(loc, builder.getI32Type(), indexAttr);
root = builder.create<InsertElementOp>(loc, rootType, root, it.value(),
indexValue);
}
}
return root;
}
return emitError(loc) << "unhandled constant " << diag(*constant);
}
FailureOr<Value> Importer::convertConstantExpr(llvm::Constant *constant) {
assert(constantInsertionBlock &&
"expected the constant insertion block to be non-null");
// Insert the constant after the last one or at the start or the entry block.
OpBuilder::InsertionGuard guard(builder);
if (!constantInsertionOp) {
builder.setInsertionPointToStart(constantInsertionBlock);
} else {
builder.setInsertionPointAfter(constantInsertionOp);
}
// Convert all constants of the expression and add them to `valueMapping`.
SetVector<llvm::Constant *> constantsToConvert =
getConstantsToConvert(constant);
for (llvm::Constant *constantToConvert : constantsToConvert) {
FailureOr<Value> converted = convertConstant(constantToConvert);
if (failed(converted))
return failure();
mapValue(constantToConvert, converted.value());
}
// Update the constant insertion point and return the converted constant.
Value result = lookupValue(constant);
constantInsertionOp = result.getDefiningOp();
return result;
}
FailureOr<Value> Importer::convertValue(llvm::Value *value) {
// A value may be wrapped as metadata, for example, when passed to a debug
// intrinsic. Unwrap these values before the conversion.
if (auto *nodeAsVal = dyn_cast<llvm::MetadataAsValue>(value))
if (auto *node = dyn_cast<llvm::ValueAsMetadata>(nodeAsVal->getMetadata()))
value = node->getValue();
// Return the mapped value if it has been converted before.
if (valueMapping.count(value))
return lookupValue(value);
// Convert constants such as immediate values that have no mapping yet.
if (auto *constant = dyn_cast<llvm::Constant>(value))
return convertConstantExpr(constant);
Location loc = UnknownLoc::get(context);
if (auto *inst = dyn_cast<llvm::Instruction>(value))
loc = translateLoc(inst->getDebugLoc());
return emitError(loc) << "unhandled value " << diag(*value);
}
FailureOr<SmallVector<Value>>
Importer::convertValues(ArrayRef<llvm::Value *> values) {
SmallVector<Value> remapped;
remapped.reserve(values.size());
for (llvm::Value *value : values) {
FailureOr<Value> converted = convertValue(value);
if (failed(converted))
return failure();
remapped.push_back(converted.value());
}
return remapped;
}
IntegerAttr Importer::matchIntegerAttr(llvm::Value *value) {
IntegerAttr integerAttr;
FailureOr<Value> converted = convertValue(value);
bool success = succeeded(converted) &&
matchPattern(converted.value(), m_Constant(&integerAttr));
assert(success && "expected a constant value");
(void)success;
return integerAttr;
}
DILocalVariableAttr Importer::matchLocalVariableAttr(llvm::Value *value) {
auto *nodeAsVal = cast<llvm::MetadataAsValue>(value);
auto *node = cast<llvm::DILocalVariable>(nodeAsVal->getMetadata());
return debugImporter.translate(node);
}
LogicalResult
Importer::convertBranchArgs(llvm::Instruction *branch, llvm::BasicBlock *target,
SmallVectorImpl<Value> &blockArguments) {
for (auto inst = target->begin(); isa<llvm::PHINode>(inst); ++inst) {
auto *phiInst = cast<llvm::PHINode>(&*inst);
llvm::Value *value = phiInst->getIncomingValueForBlock(branch->getParent());
FailureOr<Value> converted = convertValue(value);
if (failed(converted))
return failure();
blockArguments.push_back(converted.value());
}
return success();
}
LogicalResult
Importer::convertCallTypeAndOperands(llvm::CallBase *callInst,
SmallVectorImpl<Type> &types,
SmallVectorImpl<Value> &operands) {
if (!callInst->getType()->isVoidTy())
types.push_back(convertType(callInst->getType()));
if (!callInst->getCalledFunction()) {
FailureOr<Value> called = convertValue(callInst->getCalledOperand());
if (failed(called))
return failure();
operands.push_back(called.value());
}
SmallVector<llvm::Value *> args(callInst->args());
FailureOr<SmallVector<Value>> arguments = convertValues(args);
if (failed(arguments))
return failure();
llvm::append_range(operands, arguments.value());
return success();
}
LogicalResult Importer::convertIntrinsic(OpBuilder &odsBuilder,
llvm::CallInst *inst,
llvm::Intrinsic::ID intrinsicID) {
Location loc = translateLoc(inst->getDebugLoc());
// Check if the intrinsic is convertible to an MLIR dialect counterpart and
// copy the arguments to an an LLVM operands array reference for conversion.
if (isConvertibleIntrinsic(intrinsicID)) {
SmallVector<llvm::Value *> args(inst->args());
ArrayRef<llvm::Value *> llvmOperands(args);
#include "mlir/Dialect/LLVMIR/LLVMIntrinsicFromLLVMIRConversions.inc"
}
return emitError(loc) << "unhandled intrinsic " << diag(*inst);
}
LogicalResult Importer::convertOperation(OpBuilder &odsBuilder,
llvm::Instruction *inst) {
// Copy the operands to an LLVM operands array reference for conversion.
SmallVector<llvm::Value *> operands(inst->operands());
ArrayRef<llvm::Value *> llvmOperands(operands);
// Convert all instructions that provide an MLIR builder.
#include "mlir/Dialect/LLVMIR/LLVMOpFromLLVMIRConversions.inc"
// Convert all remaining instructions that do not provide an MLIR builder.
Location loc = translateLoc(inst->getDebugLoc());
if (inst->getOpcode() == llvm::Instruction::Br) {
auto *brInst = cast<llvm::BranchInst>(inst);
SmallVector<Block *> succBlocks;
SmallVector<SmallVector<Value>> succBlockArgs;
for (auto i : llvm::seq<unsigned>(0, brInst->getNumSuccessors())) {
llvm::BasicBlock *succ = brInst->getSuccessor(i);
SmallVector<Value> blockArgs;
if (failed(convertBranchArgs(brInst, succ, blockArgs)))
return failure();
succBlocks.push_back(lookupBlock(succ));
succBlockArgs.push_back(blockArgs);
}
if (brInst->isConditional()) {
FailureOr<Value> condition = convertValue(brInst->getCondition());
if (failed(condition))
return failure();
builder.create<LLVM::CondBrOp>(loc, condition.value(), succBlocks.front(),
succBlockArgs.front(), succBlocks.back(),
succBlockArgs.back());
} else {
builder.create<LLVM::BrOp>(loc, succBlockArgs.front(),
succBlocks.front());
}
return success();
}
if (inst->getOpcode() == llvm::Instruction::Switch) {
auto *swInst = cast<llvm::SwitchInst>(inst);
// Process the condition value.
FailureOr<Value> condition = convertValue(swInst->getCondition());
if (failed(condition))
return failure();
SmallVector<Value> defaultBlockArgs;
// Process the default case.
llvm::BasicBlock *defaultBB = swInst->getDefaultDest();
if (failed(convertBranchArgs(swInst, defaultBB, defaultBlockArgs)))
return failure();
// Process the cases.
unsigned numCases = swInst->getNumCases();
SmallVector<SmallVector<Value>> caseOperands(numCases);
SmallVector<ValueRange> caseOperandRefs(numCases);
SmallVector<int32_t> caseValues(numCases);
SmallVector<Block *> caseBlocks(numCases);
for (const auto &it : llvm::enumerate(swInst->cases())) {
const llvm::SwitchInst::CaseHandle &caseHandle = it.value();
llvm::BasicBlock *succBB = caseHandle.getCaseSuccessor();
if (failed(convertBranchArgs(swInst, succBB, caseOperands[it.index()])))
return failure();
caseOperandRefs[it.index()] = caseOperands[it.index()];
caseValues[it.index()] = caseHandle.getCaseValue()->getSExtValue();
caseBlocks[it.index()] = lookupBlock(succBB);
}
builder.create<SwitchOp>(loc, condition.value(), lookupBlock(defaultBB),
defaultBlockArgs, caseValues, caseBlocks,
caseOperandRefs);
return success();
}
if (inst->getOpcode() == llvm::Instruction::PHI) {
Type type = convertType(inst->getType());
mapValue(inst, builder.getInsertionBlock()->addArgument(
type, translateLoc(inst->getDebugLoc())));
return success();
}
if (inst->getOpcode() == llvm::Instruction::Call) {
auto *callInst = cast<llvm::CallInst>(inst);
SmallVector<Type> types;
SmallVector<Value> operands;
if (failed(convertCallTypeAndOperands(callInst, types, operands)))
return failure();
CallOp callOp;
if (llvm::Function *callee = callInst->getCalledFunction()) {
callOp = builder.create<CallOp>(
loc, types, SymbolRefAttr::get(context, callee->getName()), operands);
} else {
callOp = builder.create<CallOp>(loc, types, operands);
}
setFastmathFlagsAttr(inst, callOp);
if (!callInst->getType()->isVoidTy())
mapValue(inst, callOp.getResult());
return success();
}
if (inst->getOpcode() == llvm::Instruction::LandingPad) {
auto *lpInst = cast<llvm::LandingPadInst>(inst);
SmallVector<Value> operands;
operands.reserve(lpInst->getNumClauses());
for (auto i : llvm::seq<unsigned>(0, lpInst->getNumClauses())) {
FailureOr<Value> operand = convertConstantExpr(lpInst->getClause(i));
if (failed(operand))
return failure();
operands.push_back(operand.value());
}
Type type = convertType(lpInst->getType());
Value res =
builder.create<LandingpadOp>(loc, type, lpInst->isCleanup(), operands);
mapValue(inst, res);
return success();
}
if (inst->getOpcode() == llvm::Instruction::Invoke) {
auto *invokeInst = cast<llvm::InvokeInst>(inst);
SmallVector<Type> types;
SmallVector<Value> operands;
if (failed(convertCallTypeAndOperands(invokeInst, types, operands)))
return failure();
SmallVector<Value> normalArgs, unwindArgs;
(void)convertBranchArgs(invokeInst, invokeInst->getNormalDest(),
normalArgs);
(void)convertBranchArgs(invokeInst, invokeInst->getUnwindDest(),
unwindArgs);
InvokeOp invokeOp;
if (llvm::Function *callee = invokeInst->getCalledFunction()) {
invokeOp = builder.create<InvokeOp>(
loc, types,
SymbolRefAttr::get(builder.getContext(), callee->getName()), operands,
lookupBlock(invokeInst->getNormalDest()), normalArgs,
lookupBlock(invokeInst->getUnwindDest()), unwindArgs);
} else {
invokeOp = builder.create<InvokeOp>(
loc, types, operands, lookupBlock(invokeInst->getNormalDest()),
normalArgs, lookupBlock(invokeInst->getUnwindDest()), unwindArgs);
}
if (!invokeInst->getType()->isVoidTy())
mapValue(inst, invokeOp.getResults().front());
return success();
}
if (inst->getOpcode() == llvm::Instruction::GetElementPtr) {
auto *gepInst = cast<llvm::GetElementPtrInst>(inst);
Type sourceElementType = convertType(gepInst->getSourceElementType());
FailureOr<Value> basePtr = convertValue(gepInst->getOperand(0));
if (failed(basePtr))
return failure();
// Treat every indices as dynamic since GEPOp::build will refine those
// indices into static attributes later. One small downside of this
// approach is that many unused `llvm.mlir.constant` would be emitted
// at first place.
SmallVector<GEPArg> indices;
for (llvm::Value *operand : llvm::drop_begin(gepInst->operand_values())) {
FailureOr<Value> index = convertValue(operand);
if (failed(index))
return failure();
indices.push_back(index.value());
}
Type type = convertType(inst->getType());
Value res =
builder.create<GEPOp>(loc, type, sourceElementType, basePtr.value(),
indices, gepInst->isInBounds());
mapValue(inst, res);
return success();
}
return emitError(loc) << "unhandled instruction " << diag(*inst);
}
LogicalResult Importer::processInstruction(llvm::Instruction *inst) {
// FIXME: Support uses of SubtargetData.
// FIXME: Add support for call / operand attributes.
// FIXME: Add support for the indirectbr, cleanupret, catchret, catchswitch,
// callbr, vaarg, landingpad, catchpad, cleanuppad instructions.
// Convert LLVM intrinsics calls to MLIR intrinsics.
if (auto *callInst = dyn_cast<llvm::CallInst>(inst)) {
llvm::Function *callee = callInst->getCalledFunction();
if (callee && callee->isIntrinsic())
return convertIntrinsic(builder, callInst, callInst->getIntrinsicID());
}
// Convert all remaining LLVM instructions to MLIR operations.
return convertOperation(builder, inst);
}
FlatSymbolRefAttr Importer::getPersonalityAsAttr(llvm::Function *f) {
if (!f->hasPersonalityFn())
return nullptr;
llvm::Constant *pf = f->getPersonalityFn();
// If it directly has a name, we can use it.
if (pf->hasName())
return SymbolRefAttr::get(builder.getContext(), pf->getName());
// If it doesn't have a name, currently, only function pointers that are
// bitcast to i8* are parsed.
if (auto *ce = dyn_cast<llvm::ConstantExpr>(pf)) {
if (ce->getOpcode() == llvm::Instruction::BitCast &&
ce->getType() == llvm::Type::getInt8PtrTy(f->getContext())) {
if (auto *func = dyn_cast<llvm::Function>(ce->getOperand(0)))
return SymbolRefAttr::get(builder.getContext(), func->getName());
}
}
return FlatSymbolRefAttr();
}
void Importer::processFunctionAttributes(llvm::Function *func,
LLVMFuncOp funcOp) {
auto addNamedUnitAttr = [&](StringRef name) {
return funcOp->setAttr(name, UnitAttr::get(context));
};
if (func->doesNotAccessMemory())
addNamedUnitAttr(LLVMDialect::getReadnoneAttrName());
}
LogicalResult Importer::processFunction(llvm::Function *func) {
clearBlockAndValueMapping();
auto functionType =
convertType(func->getFunctionType()).dyn_cast<LLVMFunctionType>();
if (func->isIntrinsic() && isConvertibleIntrinsic(func->getIntrinsicID()))
return success();
bool dsoLocal = func->hasLocalLinkage();
CConv cconv = convertCConvFromLLVM(func->getCallingConv());
// Insert the function at the end of the module.
OpBuilder::InsertionGuard guard(builder);
builder.setInsertionPoint(module.getBody(), module.getBody()->end());
LLVMFuncOp funcOp = builder.create<LLVMFuncOp>(
UnknownLoc::get(context), func->getName(), functionType,
convertLinkageFromLLVM(func->getLinkage()), dsoLocal, cconv);
// Set the function debug information if available.
debugImporter.translate(func, funcOp);
for (const auto &it : llvm::enumerate(functionType.getParams())) {
llvm::SmallVector<NamedAttribute, 1> argAttrs;
if (auto *type = func->getParamByValType(it.index())) {
Type mlirType = convertType(type);
argAttrs.push_back(
NamedAttribute(builder.getStringAttr(LLVMDialect::getByValAttrName()),
TypeAttr::get(mlirType)));
}
if (auto *type = func->getParamByRefType(it.index())) {
Type mlirType = convertType(type);
argAttrs.push_back(
NamedAttribute(builder.getStringAttr(LLVMDialect::getByRefAttrName()),
TypeAttr::get(mlirType)));
}
if (auto *type = func->getParamStructRetType(it.index())) {
Type mlirType = convertType(type);
argAttrs.push_back(NamedAttribute(
builder.getStringAttr(LLVMDialect::getStructRetAttrName()),
TypeAttr::get(mlirType)));
}
if (auto *type = func->getParamInAllocaType(it.index())) {
Type mlirType = convertType(type);
argAttrs.push_back(NamedAttribute(
builder.getStringAttr(LLVMDialect::getInAllocaAttrName()),
TypeAttr::get(mlirType)));
}
funcOp.setArgAttrs(it.index(), argAttrs);
}
if (FlatSymbolRefAttr personality = getPersonalityAsAttr(func))
funcOp.setPersonalityAttr(personality);
else if (func->hasPersonalityFn())
emitWarning(UnknownLoc::get(context),
"could not deduce personality, skipping it");
if (func->hasGC())
funcOp.setGarbageCollector(StringRef(func->getGC()));
// Handle Function attributes.
processFunctionAttributes(func, funcOp);
if (func->isDeclaration())
return success();
// Eagerly create all blocks.
for (llvm::BasicBlock &bb : *func) {
Block *block =
builder.createBlock(&funcOp.getBody(), funcOp.getBody().end());
mapBlock(&bb, block);
}
// Add function arguments to the entry block.
for (const auto &it : llvm::enumerate(func->args())) {
BlockArgument blockArg = funcOp.getFunctionBody().addArgument(
functionType.getParamType(it.index()), funcOp.getLoc());
mapValue(&it.value(), blockArg);
}
// Process the blocks in topological order. The ordered traversal ensures
// operands defined in a dominating block have a valid mapping to an MLIR
// value once a block is translated.
SetVector<llvm::BasicBlock *> blocks = getTopologicallySortedBlocks(func);
setConstantInsertionPointToStart(lookupBlock(blocks.front()));
for (llvm::BasicBlock *bb : blocks) {
if (failed(processBasicBlock(bb, lookupBlock(bb))))
return failure();
}
return success();
}
LogicalResult Importer::processBasicBlock(llvm::BasicBlock *bb, Block *block) {
builder.setInsertionPointToStart(block);
for (llvm::Instruction &inst : *bb) {
if (failed(processInstruction(&inst)))
return failure();
}
return success();
}
OwningOpRef<ModuleOp>
mlir::translateLLVMIRToModule(std::unique_ptr<llvm::Module> llvmModule,
MLIRContext *context) {
context->loadDialect<LLVMDialect>();
context->loadDialect<DLTIDialect>();
OwningOpRef<ModuleOp> module(ModuleOp::create(FileLineColLoc::get(
StringAttr::get(context, llvmModule->getSourceFileName()), /*line=*/0,
/*column=*/0)));
DataLayoutSpecInterface dlSpec =
translateDataLayout(llvmModule->getDataLayout(), context);
if (!dlSpec) {
emitError(UnknownLoc::get(context), "can't translate data layout");
return {};
}
module.get()->setAttr(DLTIDialect::kDataLayoutAttrName, dlSpec);
Importer deserializer(context, module.get());
for (llvm::GlobalVariable &gv : llvmModule->globals()) {
if (!deserializer.processGlobal(&gv))
return {};
}
for (llvm::Function &f : llvmModule->functions()) {
if (failed(deserializer.processFunction(&f)))
return {};
}
return module;
}
// Deserializes the LLVM bitcode stored in `input` into an MLIR module in the
// LLVM dialect.
static OwningOpRef<Operation *>
translateLLVMIRToModule(llvm::SourceMgr &sourceMgr, MLIRContext *context) {
llvm::SMDiagnostic err;
llvm::LLVMContext llvmContext;
std::unique_ptr<llvm::Module> llvmModule = llvm::parseIR(
*sourceMgr.getMemoryBuffer(sourceMgr.getMainFileID()), err, llvmContext);
if (!llvmModule) {
std::string errStr;
llvm::raw_string_ostream errStream(errStr);
err.print(/*ProgName=*/"", errStream);
emitError(UnknownLoc::get(context)) << errStream.str();
return {};
}
return translateLLVMIRToModule(std::move(llvmModule), context);
}
namespace mlir {
void registerFromLLVMIRTranslation() {
TranslateToMLIRRegistration fromLLVM(
"import-llvm", "from llvm to mlir",
[](llvm::SourceMgr &sourceMgr, MLIRContext *context) {
return ::translateLLVMIRToModule(sourceMgr, context);
});
}
} // namespace mlir
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