95b4128c6a
Flang generates many globals to handle derived types. There was a check in debug info to filter them based on the information that their names start with a period. This changed since PR#104859 where 'X' is being used instead of '.'. This PR fixes this issue by also adding 'X' in that list. As user variables gets lower cased by the NameUniquer, there is no risk that those will be filtered out. I added a test for that to be sure.
477 lines
21 KiB
C++
477 lines
21 KiB
C++
//===-------------- AddDebugInfo.cpp -- add debug info -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This pass populates some debug information for the module and functions.
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//===----------------------------------------------------------------------===//
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#include "DebugTypeGenerator.h"
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#include "flang/Common/Version.h"
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#include "flang/Optimizer/Builder/FIRBuilder.h"
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#include "flang/Optimizer/Builder/Todo.h"
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#include "flang/Optimizer/CodeGen/CGOps.h"
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#include "flang/Optimizer/Dialect/FIRDialect.h"
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#include "flang/Optimizer/Dialect/FIROps.h"
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#include "flang/Optimizer/Dialect/FIROpsSupport.h"
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#include "flang/Optimizer/Dialect/FIRType.h"
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#include "flang/Optimizer/Dialect/Support/FIRContext.h"
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#include "flang/Optimizer/Support/InternalNames.h"
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#include "flang/Optimizer/Transforms/Passes.h"
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#include "mlir/Dialect/Func/IR/FuncOps.h"
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "mlir/IR/Matchers.h"
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#include "mlir/IR/TypeUtilities.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/DialectConversion.h"
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#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
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#include "mlir/Transforms/RegionUtils.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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namespace fir {
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#define GEN_PASS_DEF_ADDDEBUGINFO
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#include "flang/Optimizer/Transforms/Passes.h.inc"
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} // namespace fir
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#define DEBUG_TYPE "flang-add-debug-info"
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namespace {
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class AddDebugInfoPass : public fir::impl::AddDebugInfoBase<AddDebugInfoPass> {
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void handleDeclareOp(fir::cg::XDeclareOp declOp,
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mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scopeAttr,
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fir::DebugTypeGenerator &typeGen,
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mlir::SymbolTable *symbolTable);
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public:
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AddDebugInfoPass(fir::AddDebugInfoOptions options) : Base(options) {}
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void runOnOperation() override;
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private:
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llvm::StringMap<mlir::LLVM::DIModuleAttr> moduleMap;
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mlir::LLVM::DIModuleAttr getOrCreateModuleAttr(
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const std::string &name, mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scope, unsigned line, bool decl);
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void handleGlobalOp(fir::GlobalOp glocalOp, mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scope,
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fir::DebugTypeGenerator &typeGen,
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mlir::SymbolTable *symbolTable,
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fir::cg::XDeclareOp declOp);
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void handleFuncOp(mlir::func::FuncOp funcOp, mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DICompileUnitAttr cuAttr,
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fir::DebugTypeGenerator &typeGen,
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mlir::SymbolTable *symbolTable);
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std::optional<mlir::LLVM::DIModuleAttr>
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getModuleAttrFromGlobalOp(fir::GlobalOp globalOp,
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mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scope);
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};
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bool debugInfoIsAlreadySet(mlir::Location loc) {
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if (mlir::isa<mlir::FusedLoc>(loc)) {
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if (loc->findInstanceOf<mlir::FusedLocWith<fir::LocationKindAttr>>())
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return false;
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return true;
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}
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return false;
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}
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} // namespace
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void AddDebugInfoPass::handleDeclareOp(fir::cg::XDeclareOp declOp,
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mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scopeAttr,
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fir::DebugTypeGenerator &typeGen,
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mlir::SymbolTable *symbolTable) {
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mlir::MLIRContext *context = &getContext();
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mlir::OpBuilder builder(context);
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auto result = fir::NameUniquer::deconstruct(declOp.getUniqName());
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if (result.first != fir::NameUniquer::NameKind::VARIABLE)
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return;
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// If this DeclareOp actually represents a global then treat it as such.
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if (auto global = symbolTable->lookup<fir::GlobalOp>(declOp.getUniqName())) {
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handleGlobalOp(global, fileAttr, scopeAttr, typeGen, symbolTable, declOp);
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return;
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}
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// Only accept local variables.
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if (result.second.procs.empty())
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return;
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// FIXME: There may be cases where an argument is processed a bit before
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// DeclareOp is generated. In that case, DeclareOp may point to an
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// intermediate op and not to BlockArgument.
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// Moreover, with MLIR inlining we cannot use the BlockArgument
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// position to identify the original number of the dummy argument.
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// If we want to keep running AddDebugInfoPass late, the dummy argument
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// position in the argument list has to be expressed in FIR (e.g. as a
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// constant attribute of [hl]fir.declare/fircg.ext_declare operation that has
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// a dummy_scope operand).
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unsigned argNo = 0;
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if (fir::isDummyArgument(declOp.getMemref())) {
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auto arg = llvm::cast<mlir::BlockArgument>(declOp.getMemref());
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argNo = arg.getArgNumber() + 1;
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}
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auto tyAttr = typeGen.convertType(fir::unwrapRefType(declOp.getType()),
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fileAttr, scopeAttr, declOp);
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auto localVarAttr = mlir::LLVM::DILocalVariableAttr::get(
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context, scopeAttr, mlir::StringAttr::get(context, result.second.name),
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fileAttr, getLineFromLoc(declOp.getLoc()), argNo, /* alignInBits*/ 0,
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tyAttr, mlir::LLVM::DIFlags::Zero);
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declOp->setLoc(builder.getFusedLoc({declOp->getLoc()}, localVarAttr));
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}
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// The `module` does not have a first class representation in the `FIR`. We
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// extract information about it from the name of the identifiers and keep a
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// map to avoid duplication.
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mlir::LLVM::DIModuleAttr AddDebugInfoPass::getOrCreateModuleAttr(
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const std::string &name, mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scope, unsigned line, bool decl) {
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mlir::MLIRContext *context = &getContext();
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mlir::LLVM::DIModuleAttr modAttr;
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if (auto iter{moduleMap.find(name)}; iter != moduleMap.end()) {
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modAttr = iter->getValue();
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} else {
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modAttr = mlir::LLVM::DIModuleAttr::get(
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context, fileAttr, scope, mlir::StringAttr::get(context, name),
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/* configMacros */ mlir::StringAttr(),
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/* includePath */ mlir::StringAttr(),
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/* apinotes */ mlir::StringAttr(), line, decl);
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moduleMap[name] = modAttr;
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}
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return modAttr;
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}
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/// If globalOp represents a module variable, return a ModuleAttr that
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/// represents that module.
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std::optional<mlir::LLVM::DIModuleAttr>
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AddDebugInfoPass::getModuleAttrFromGlobalOp(fir::GlobalOp globalOp,
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mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scope) {
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mlir::MLIRContext *context = &getContext();
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mlir::OpBuilder builder(context);
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std::pair result = fir::NameUniquer::deconstruct(globalOp.getSymName());
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// Only look for module if this variable is not part of a function.
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if (!result.second.procs.empty() || result.second.modules.empty())
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return std::nullopt;
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// DWARF5 says following about the fortran modules:
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// A Fortran 90 module may also be represented by a module entry
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// (but no declaration attribute is warranted because Fortran has no concept
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// of a corresponding module body).
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// But in practice, compilers use declaration attribute with a module in cases
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// where module was defined in another source file (only being used in this
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// one). The isInitialized() seems to provide the right information
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// but inverted. It is true where module is actually defined but false where
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// it is used.
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// FIXME: Currently we don't have the line number on which a module was
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// declared. We are using a best guess of line - 1 where line is the source
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// line of the first member of the module that we encounter.
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unsigned line = getLineFromLoc(globalOp.getLoc());
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mlir::LLVM::DISubprogramAttr sp =
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mlir::dyn_cast_if_present<mlir::LLVM::DISubprogramAttr>(scope);
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// Modules are generated at compile unit scope
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if (sp)
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scope = sp.getCompileUnit();
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return getOrCreateModuleAttr(result.second.modules[0], fileAttr, scope,
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std::max(line - 1, (unsigned)1),
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!globalOp.isInitialized());
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}
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void AddDebugInfoPass::handleGlobalOp(fir::GlobalOp globalOp,
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mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DIScopeAttr scope,
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fir::DebugTypeGenerator &typeGen,
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mlir::SymbolTable *symbolTable,
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fir::cg::XDeclareOp declOp) {
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if (debugInfoIsAlreadySet(globalOp.getLoc()))
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return;
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mlir::MLIRContext *context = &getContext();
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mlir::OpBuilder builder(context);
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std::pair result = fir::NameUniquer::deconstruct(globalOp.getSymName());
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if (result.first != fir::NameUniquer::NameKind::VARIABLE)
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return;
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if (fir::NameUniquer::isSpecialSymbol(result.second.name))
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return;
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unsigned line = getLineFromLoc(globalOp.getLoc());
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std::optional<mlir::LLVM::DIModuleAttr> modOpt =
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getModuleAttrFromGlobalOp(globalOp, fileAttr, scope);
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if (modOpt)
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scope = *modOpt;
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mlir::LLVM::DITypeAttr diType =
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typeGen.convertType(globalOp.getType(), fileAttr, scope, declOp);
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auto gvAttr = mlir::LLVM::DIGlobalVariableAttr::get(
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context, scope, mlir::StringAttr::get(context, result.second.name),
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mlir::StringAttr::get(context, globalOp.getName()), fileAttr, line,
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diType, /*isLocalToUnit*/ false,
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/*isDefinition*/ globalOp.isInitialized(), /* alignInBits*/ 0);
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globalOp->setLoc(builder.getFusedLoc({globalOp->getLoc()}, gvAttr));
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}
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void AddDebugInfoPass::handleFuncOp(mlir::func::FuncOp funcOp,
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mlir::LLVM::DIFileAttr fileAttr,
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mlir::LLVM::DICompileUnitAttr cuAttr,
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fir::DebugTypeGenerator &typeGen,
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mlir::SymbolTable *symbolTable) {
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mlir::Location l = funcOp->getLoc();
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// If fused location has already been created then nothing to do
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// Otherwise, create a fused location.
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if (debugInfoIsAlreadySet(l))
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return;
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mlir::MLIRContext *context = &getContext();
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mlir::OpBuilder builder(context);
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llvm::StringRef fileName(fileAttr.getName());
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llvm::StringRef filePath(fileAttr.getDirectory());
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unsigned int CC = (funcOp.getName() == fir::NameUniquer::doProgramEntry())
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? llvm::dwarf::getCallingConvention("DW_CC_program")
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: llvm::dwarf::getCallingConvention("DW_CC_normal");
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if (auto funcLoc = mlir::dyn_cast<mlir::FileLineColLoc>(l)) {
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fileName = llvm::sys::path::filename(funcLoc.getFilename().getValue());
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filePath = llvm::sys::path::parent_path(funcLoc.getFilename().getValue());
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}
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mlir::StringAttr fullName = mlir::StringAttr::get(context, funcOp.getName());
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mlir::Attribute attr = funcOp->getAttr(fir::getInternalFuncNameAttrName());
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mlir::StringAttr funcName =
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(attr) ? mlir::cast<mlir::StringAttr>(attr)
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: mlir::StringAttr::get(context, funcOp.getName());
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auto result = fir::NameUniquer::deconstruct(funcName);
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funcName = mlir::StringAttr::get(context, result.second.name);
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// try to use a better function name than _QQmain for the program statement
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bool isMain = false;
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if (funcName == fir::NameUniquer::doProgramEntry()) {
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isMain = true;
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mlir::StringAttr bindcName =
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funcOp->getAttrOfType<mlir::StringAttr>(fir::getSymbolAttrName());
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if (bindcName)
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funcName = bindcName;
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}
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llvm::SmallVector<mlir::LLVM::DITypeAttr> types;
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for (auto resTy : funcOp.getResultTypes()) {
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auto tyAttr =
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typeGen.convertType(resTy, fileAttr, cuAttr, /*declOp=*/nullptr);
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types.push_back(tyAttr);
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}
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// If no return type then add a null type as a place holder for that.
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if (types.empty())
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types.push_back(mlir::LLVM::DINullTypeAttr::get(context));
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for (auto inTy : funcOp.getArgumentTypes()) {
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auto tyAttr = typeGen.convertType(fir::unwrapRefType(inTy), fileAttr,
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cuAttr, /*declOp=*/nullptr);
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types.push_back(tyAttr);
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}
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mlir::LLVM::DISubroutineTypeAttr subTypeAttr =
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mlir::LLVM::DISubroutineTypeAttr::get(context, CC, types);
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mlir::LLVM::DIFileAttr funcFileAttr =
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mlir::LLVM::DIFileAttr::get(context, fileName, filePath);
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// Only definitions need a distinct identifier and a compilation unit.
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mlir::DistinctAttr id, id2;
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mlir::LLVM::DIScopeAttr Scope = fileAttr;
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mlir::LLVM::DICompileUnitAttr compilationUnit;
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mlir::LLVM::DISubprogramFlags subprogramFlags =
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mlir::LLVM::DISubprogramFlags{};
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if (isOptimized)
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subprogramFlags = mlir::LLVM::DISubprogramFlags::Optimized;
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if (isMain)
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subprogramFlags =
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subprogramFlags | mlir::LLVM::DISubprogramFlags::MainSubprogram;
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if (!funcOp.isExternal()) {
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// Place holder and final function have to have different IDs, otherwise
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// translation code will reject one of them.
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id = mlir::DistinctAttr::create(mlir::UnitAttr::get(context));
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id2 = mlir::DistinctAttr::create(mlir::UnitAttr::get(context));
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compilationUnit = cuAttr;
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subprogramFlags =
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subprogramFlags | mlir::LLVM::DISubprogramFlags::Definition;
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}
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unsigned line = getLineFromLoc(l);
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if (fir::isInternalProcedure(funcOp)) {
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// For contained functions, the scope is the parent subroutine.
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mlir::SymbolRefAttr sym = mlir::cast<mlir::SymbolRefAttr>(
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funcOp->getAttr(fir::getHostSymbolAttrName()));
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if (sym) {
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if (auto func =
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symbolTable->lookup<mlir::func::FuncOp>(sym.getLeafReference())) {
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// Make sure that parent is processed.
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handleFuncOp(func, fileAttr, cuAttr, typeGen, symbolTable);
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if (auto fusedLoc =
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mlir::dyn_cast_if_present<mlir::FusedLoc>(func.getLoc())) {
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if (auto spAttr =
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mlir::dyn_cast_if_present<mlir::LLVM::DISubprogramAttr>(
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fusedLoc.getMetadata()))
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Scope = spAttr;
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}
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}
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}
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} else if (!result.second.modules.empty()) {
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Scope = getOrCreateModuleAttr(result.second.modules[0], fileAttr, cuAttr,
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line - 1, false);
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}
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// Don't process variables if user asked for line tables only.
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if (debugLevel == mlir::LLVM::DIEmissionKind::LineTablesOnly) {
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auto spAttr = mlir::LLVM::DISubprogramAttr::get(
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context, id, compilationUnit, Scope, funcName, fullName, funcFileAttr,
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line, line, subprogramFlags, subTypeAttr, /*retainedNodes=*/{},
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/*annotations=*/{});
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funcOp->setLoc(builder.getFusedLoc({l}, spAttr));
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return;
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}
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mlir::DistinctAttr recId =
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mlir::DistinctAttr::create(mlir::UnitAttr::get(context));
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// The debug attribute in MLIR are readonly once created. But in case of
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// imported entities, we have a circular dependency. The
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// DIImportedEntityAttr requires scope information (DISubprogramAttr in this
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// case) and DISubprogramAttr requires the list of imported entities. The
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// MLIR provides a way where a DISubprogramAttr an be created with a certain
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// recID and be used in places like DIImportedEntityAttr. After that another
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// DISubprogramAttr can be created with same recID but with list of entities
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// now available. The MLIR translation code takes care of updating the
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// references. Note that references will be updated only in the things that
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// are part of DISubprogramAttr (like DIImportedEntityAttr) so we have to
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// create the final DISubprogramAttr before we process local variables.
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// Look at DIRecursiveTypeAttrInterface for more details.
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auto spAttr = mlir::LLVM::DISubprogramAttr::get(
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context, recId, /*isRecSelf=*/true, id, compilationUnit, Scope, funcName,
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fullName, funcFileAttr, line, line, subprogramFlags, subTypeAttr,
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/*retainedNodes=*/{}, /*annotations=*/{});
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// There is no direct information in the IR for any 'use' statement in the
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// function. We have to extract that information from the DeclareOp. We do
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// a pass on the DeclareOp and generate ModuleAttr and corresponding
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// DIImportedEntityAttr for that module.
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// FIXME: As we are depending on the variables to see which module is being
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// 'used' in the function, there are certain limitations.
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// For things like 'use mod1, only: v1', whole module will be brought into the
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// namespace in the debug info. It is not a problem as such unless there is a
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// clash of names.
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// There is no information about module variable renaming
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llvm::DenseSet<mlir::LLVM::DIImportedEntityAttr> importedModules;
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funcOp.walk([&](fir::cg::XDeclareOp declOp) {
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if (&funcOp.front() == declOp->getBlock())
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if (auto global =
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symbolTable->lookup<fir::GlobalOp>(declOp.getUniqName())) {
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std::optional<mlir::LLVM::DIModuleAttr> modOpt =
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getModuleAttrFromGlobalOp(global, fileAttr, cuAttr);
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if (modOpt) {
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auto importedEntity = mlir::LLVM::DIImportedEntityAttr::get(
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context, llvm::dwarf::DW_TAG_imported_module, spAttr, *modOpt,
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fileAttr, /*line=*/1, /*name=*/nullptr, /*elements*/ {});
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importedModules.insert(importedEntity);
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}
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}
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});
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llvm::SmallVector<mlir::LLVM::DINodeAttr> entities(importedModules.begin(),
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importedModules.end());
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// We have the imported entities now. Generate the final DISubprogramAttr.
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spAttr = mlir::LLVM::DISubprogramAttr::get(
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context, recId, /*isRecSelf=*/false, id2, compilationUnit, Scope,
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funcName, fullName, funcFileAttr, line, line, subprogramFlags,
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subTypeAttr, entities, /*annotations=*/{});
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funcOp->setLoc(builder.getFusedLoc({l}, spAttr));
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funcOp.walk([&](fir::cg::XDeclareOp declOp) {
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// FIXME: We currently dont handle variables that are not in the entry
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// blocks of the fuctions. These may be variable or arguments used in the
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// OpenMP target regions.
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if (&funcOp.front() == declOp->getBlock())
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handleDeclareOp(declOp, fileAttr, spAttr, typeGen, symbolTable);
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});
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}
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void AddDebugInfoPass::runOnOperation() {
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mlir::ModuleOp module = getOperation();
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mlir::MLIRContext *context = &getContext();
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mlir::SymbolTable symbolTable(module);
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llvm::StringRef fileName;
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std::string filePath;
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std::optional<mlir::DataLayout> dl =
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fir::support::getOrSetDataLayout(module, /*allowDefaultLayout=*/true);
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if (!dl) {
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mlir::emitError(module.getLoc(), "Missing data layout attribute in module");
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signalPassFailure();
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return;
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}
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fir::DebugTypeGenerator typeGen(module, &symbolTable, *dl);
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// We need 2 type of file paths here.
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// 1. Name of the file as was presented to compiler. This can be absolute
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|
// or relative to 2.
|
|
// 2. Current working directory
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//
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|
// We are also dealing with 2 different situations below. One is normal
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|
// compilation where we will have a value in 'inputFilename' and we can
|
|
// obtain the current directory using 'current_path'.
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|
// The 2nd case is when this pass is invoked directly from 'fir-opt' tool.
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|
// In that case, 'inputFilename' may be empty. Location embedded in the
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|
// module will be used to get file name and its directory.
|
|
if (inputFilename.empty()) {
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|
if (auto fileLoc = mlir::dyn_cast<mlir::FileLineColLoc>(module.getLoc())) {
|
|
fileName = llvm::sys::path::filename(fileLoc.getFilename().getValue());
|
|
filePath = llvm::sys::path::parent_path(fileLoc.getFilename().getValue());
|
|
} else
|
|
fileName = "-";
|
|
} else {
|
|
fileName = inputFilename;
|
|
llvm::SmallString<256> cwd;
|
|
if (!llvm::sys::fs::current_path(cwd))
|
|
filePath = cwd.str();
|
|
}
|
|
|
|
mlir::LLVM::DIFileAttr fileAttr =
|
|
mlir::LLVM::DIFileAttr::get(context, fileName, filePath);
|
|
mlir::StringAttr producer =
|
|
mlir::StringAttr::get(context, Fortran::common::getFlangFullVersion());
|
|
mlir::LLVM::DICompileUnitAttr cuAttr = mlir::LLVM::DICompileUnitAttr::get(
|
|
mlir::DistinctAttr::create(mlir::UnitAttr::get(context)),
|
|
llvm::dwarf::getLanguage("DW_LANG_Fortran95"), fileAttr, producer,
|
|
isOptimized, debugLevel);
|
|
|
|
module.walk([&](mlir::func::FuncOp funcOp) {
|
|
handleFuncOp(funcOp, fileAttr, cuAttr, typeGen, &symbolTable);
|
|
});
|
|
// Process any global which was not processed through DeclareOp.
|
|
if (debugLevel == mlir::LLVM::DIEmissionKind::Full) {
|
|
// Process 'GlobalOp' only if full debug info is requested.
|
|
for (auto globalOp : module.getOps<fir::GlobalOp>())
|
|
handleGlobalOp(globalOp, fileAttr, cuAttr, typeGen, &symbolTable,
|
|
/*declOp=*/nullptr);
|
|
}
|
|
}
|
|
|
|
std::unique_ptr<mlir::Pass>
|
|
fir::createAddDebugInfoPass(fir::AddDebugInfoOptions options) {
|
|
return std::make_unique<AddDebugInfoPass>(options);
|
|
}
|