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//===-- TBAABuilder.cpp -- TBAA builder definitions -----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
//
//===----------------------------------------------------------------------===//
#include "flang/Optimizer/CodeGen/TBAABuilder.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "llvm/ADT/TypeSwitch.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "flang-tbaa-builder"
using namespace mlir;
using namespace mlir::LLVM;
static llvm::cl::opt<bool> disableTBAA(
"disable-tbaa",
llvm::cl::desc("disable attaching TBAA tags to memory accessing operations "
"to override default Flang behavior"),
llvm::cl::init(false));
// tagAttachmentLimit is a debugging option that allows limiting
// the number of TBAA access tag attributes attached to operations.
// It is set to kTagAttachmentUnlimited by default denoting "no limit".
static constexpr unsigned kTagAttachmentUnlimited =
std::numeric_limits<unsigned>::max();
static llvm::cl::opt<unsigned>
tagAttachmentLimit("tbaa-attach-tag-max", llvm::cl::desc(""),
llvm::cl::init(kTagAttachmentUnlimited));
namespace fir {
std::string TBAABuilder::getNewTBAANodeName(llvm::StringRef basename) {
return (llvm::Twine(basename) + llvm::Twine('_') +
llvm::Twine(tbaaNodeCounter++))
.str();
}
TBAABuilder::TBAABuilder(mlir::ModuleOp module, bool applyTBAA)
: enableTBAA(applyTBAA && !disableTBAA) {
if (!enableTBAA)
return;
// In the usual Flang compilation flow, FIRToLLVMPass is run once,
// and the MetadataOp holding TBAA operations is created at the beginning
// of the pass. With tools like tco it is possible to invoke
// FIRToLLVMPass on already converted MLIR, so the MetadataOp
// already exists and creating a new one with the same name would
// be incorrect. If the TBAA MetadataOp is already present,
// we just disable all TBAABuilder actions (e.g. attachTBAATag()
// is a no-op).
if (llvm::any_of(
module.getBodyRegion().getOps<LLVM::MetadataOp>(),
[&](auto metaOp) { return metaOp.getSymName() == tbaaMetaOpName; })) {
enableTBAA = false;
return;
}
LLVM_DEBUG(llvm::dbgs() << "Creating TBAA MetadataOp for module '"
<< module.getName().value_or("<unknown>") << "'\n");
// Create TBAA MetadataOp with the root and basic type descriptors.
Location loc = module.getLoc();
MLIRContext *context = module.getContext();
OpBuilder builder(module.getBody(), module.getBody()->end());
tbaaMetaOp = builder.create<MetadataOp>(loc, tbaaMetaOpName);
builder.setInsertionPointToStart(&tbaaMetaOp.getBody().front());
// Root node.
auto rootOp = builder.create<TBAARootMetadataOp>(
loc, getNewTBAANodeName(kRootSymBasename), flangTBAARootId);
flangTBAARoot = FlatSymbolRefAttr::get(rootOp);
// Any access node.
auto anyAccessOp = builder.create<TBAATypeDescriptorOp>(
loc, getNewTBAANodeName(kTypeDescSymBasename),
StringAttr::get(context, anyAccessTypeDescId),
ArrayAttr::get(context, flangTBAARoot), ArrayRef<int64_t>{0});
anyAccessTypeDesc = FlatSymbolRefAttr::get(anyAccessOp);
// Any data access node.
auto anyDataAccessOp = builder.create<TBAATypeDescriptorOp>(
loc, getNewTBAANodeName(kTypeDescSymBasename),
StringAttr::get(context, anyDataAccessTypeDescId),
ArrayAttr::get(context, anyAccessTypeDesc), ArrayRef<int64_t>{0});
anyDataAccessTypeDesc = FlatSymbolRefAttr::get(anyDataAccessOp);
// Box member access node.
auto boxMemberOp = builder.create<TBAATypeDescriptorOp>(
loc, getNewTBAANodeName(kTypeDescSymBasename),
StringAttr::get(context, boxMemberTypeDescId),
ArrayAttr::get(context, anyAccessTypeDesc), ArrayRef<int64_t>{0});
boxMemberTypeDesc = FlatSymbolRefAttr::get(boxMemberOp);
}
SymbolRefAttr TBAABuilder::getAccessTag(SymbolRefAttr baseTypeDesc,
SymbolRefAttr accessTypeDesc,
int64_t offset) {
SymbolRefAttr &tag = tagsMap[{baseTypeDesc, accessTypeDesc, offset}];
if (tag)
return tag;
// Initialize new tag.
Location loc = tbaaMetaOp.getLoc();
OpBuilder builder(&tbaaMetaOp.getBody().back(),
tbaaMetaOp.getBody().back().end());
auto tagOp = builder.create<TBAATagOp>(
loc, getNewTBAANodeName(kTagSymBasename), baseTypeDesc.getLeafReference(),
accessTypeDesc.getLeafReference(), offset);
// TBAATagOp symbols must be referenced by their fully qualified
// names, so create a path to TBAATagOp symbol.
StringAttr metaOpName = SymbolTable::getSymbolName(tbaaMetaOp);
tag = SymbolRefAttr::get(builder.getContext(), metaOpName,
FlatSymbolRefAttr::get(tagOp));
return tag;
}
SymbolRefAttr TBAABuilder::getAnyBoxAccessTag() {
return getAccessTag(boxMemberTypeDesc, boxMemberTypeDesc, /*offset=*/0);
}
SymbolRefAttr TBAABuilder::getBoxAccessTag(Type baseFIRType, Type accessFIRType,
GEPOp gep) {
return getAnyBoxAccessTag();
}
SymbolRefAttr TBAABuilder::getAnyDataAccessTag() {
return getAccessTag(anyDataAccessTypeDesc, anyDataAccessTypeDesc,
/*offset=*/0);
}
SymbolRefAttr TBAABuilder::getDataAccessTag(Type baseFIRType,
Type accessFIRType, GEPOp gep) {
return getAnyDataAccessTag();
}
void TBAABuilder::attachTBAATag(AliasAnalysisOpInterface op, Type baseFIRType,
Type accessFIRType, GEPOp gep) {
if (!enableTBAA)
return;
++tagAttachmentCounter;
if (tagAttachmentLimit != kTagAttachmentUnlimited &&
tagAttachmentCounter > tagAttachmentLimit)
return;
LLVM_DEBUG(llvm::dbgs() << "Attaching TBAA tag #" << tagAttachmentCounter
<< "\n");
SymbolRefAttr tbaaTagSym;
if (baseFIRType.isa<fir::BaseBoxType>())
tbaaTagSym = getBoxAccessTag(baseFIRType, accessFIRType, gep);
else
tbaaTagSym = getDataAccessTag(baseFIRType, accessFIRType, gep);
if (!tbaaTagSym)
return;
op.setTBAATags(ArrayAttr::get(op->getContext(), tbaaTagSym));
}
} // namespace fir
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