forked from OSchip/llvm-project
551 lines
21 KiB
C++
551 lines
21 KiB
C++
//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This coordinates the debug information generation while generating code.
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//
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//===----------------------------------------------------------------------===//
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#include "CGDebugInfo.h"
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#include "CodeGenModule.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/FileManager.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace clang;
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using namespace clang::CodeGen;
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CGDebugInfo::CGDebugInfo(CodeGenModule *m)
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: M(m), DebugFactory(M->getModule()) {
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}
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CGDebugInfo::~CGDebugInfo() {
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assert(RegionStack.empty() && "Region stack mismatch, stack not empty!");
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}
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void CGDebugInfo::setLocation(SourceLocation Loc) {
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if (Loc.isValid())
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CurLoc = M->getContext().getSourceManager().getLogicalLoc(Loc);
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}
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/// getOrCreateCompileUnit - Get the compile unit from the cache or create a new
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/// one if necessary. This returns null for invalid source locations.
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llvm::DICompileUnit CGDebugInfo::getOrCreateCompileUnit(SourceLocation Loc) {
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if (Loc.isInvalid())
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return llvm::DICompileUnit();
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SourceManager &SM = M->getContext().getSourceManager();
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const FileEntry *FE = SM.getFileEntryForLoc(Loc);
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if (FE == 0) return llvm::DICompileUnit();
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// See if this compile unit has been used before.
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llvm::DICompileUnit &Unit = CompileUnitCache[FE];
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if (!Unit.isNull()) return Unit;
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// Get source file information.
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const char *FileName = FE->getName();
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const char *DirName = FE->getDir()->getName();
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// Create new compile unit.
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// FIXME: Handle other language IDs as well.
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// FIXME: Do not know how to get clang version yet.
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return Unit = DebugFactory.CreateCompileUnit(llvm::dwarf::DW_LANG_C89,
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FileName, DirName, "clang");
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}
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/// getOrCreateBuiltinType - Get the Basic type from the cache or create a new
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/// one if necessary.
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llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT,
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llvm::DICompileUnit Unit){
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unsigned Encoding = 0;
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switch (BT->getKind()) {
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default:
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case BuiltinType::Void:
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return llvm::DIType();
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case BuiltinType::UChar:
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case BuiltinType::Char_U: Encoding = llvm::dwarf::DW_ATE_unsigned_char; break;
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case BuiltinType::Char_S:
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case BuiltinType::SChar: Encoding = llvm::dwarf::DW_ATE_signed_char; break;
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case BuiltinType::UShort:
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case BuiltinType::UInt:
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case BuiltinType::ULong:
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case BuiltinType::ULongLong: Encoding = llvm::dwarf::DW_ATE_unsigned; break;
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case BuiltinType::Short:
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case BuiltinType::Int:
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case BuiltinType::Long:
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case BuiltinType::LongLong: Encoding = llvm::dwarf::DW_ATE_signed; break;
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case BuiltinType::Bool: Encoding = llvm::dwarf::DW_ATE_boolean; break;
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case BuiltinType::Float:
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case BuiltinType::Double: Encoding = llvm::dwarf::DW_ATE_float; break;
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}
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// Bit size, align and offset of the type.
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uint64_t Size = M->getContext().getTypeSize(BT);
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uint64_t Align = M->getContext().getTypeAlign(BT);
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uint64_t Offset = 0;
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return DebugFactory.CreateBasicType(Unit, BT->getName(), Unit, 0, Size, Align,
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Offset, /*flags*/ 0, Encoding);
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}
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/// getOrCreateCVRType - Get the CVR qualified type from the cache or create
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/// a new one if necessary.
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llvm::DIType CGDebugInfo::CreateCVRType(QualType Ty, llvm::DICompileUnit Unit) {
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// We will create one Derived type for one qualifier and recurse to handle any
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// additional ones.
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llvm::DIType FromTy;
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unsigned Tag;
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if (Ty.isConstQualified()) {
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Tag = llvm::dwarf::DW_TAG_const_type;
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Ty.removeConst();
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FromTy = getOrCreateType(Ty, Unit);
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} else if (Ty.isVolatileQualified()) {
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Tag = llvm::dwarf::DW_TAG_volatile_type;
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Ty.removeVolatile();
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FromTy = getOrCreateType(Ty, Unit);
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} else {
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assert(Ty.isRestrictQualified() && "Unknown type qualifier for debug info");
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Tag = llvm::dwarf::DW_TAG_restrict_type;
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Ty.removeRestrict();
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FromTy = getOrCreateType(Ty, Unit);
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}
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// No need to fill in the Name, Line, Size, Alignment, Offset in case of
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// CVR derived types.
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return DebugFactory.CreateDerivedType(Tag, Unit, "", llvm::DICompileUnit(),
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0, 0, 0, 0, 0, FromTy);
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}
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llvm::DIType CGDebugInfo::CreateType(const PointerType *Ty,
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llvm::DICompileUnit Unit) {
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llvm::DIType EltTy = getOrCreateType(Ty->getPointeeType(), Unit);
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// Bit size, align and offset of the type.
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uint64_t Size = M->getContext().getTypeSize(Ty);
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uint64_t Align = M->getContext().getTypeAlign(Ty);
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return DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type, Unit,
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"", llvm::DICompileUnit(),
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0, Size, Align, 0, 0, EltTy);
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}
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llvm::DIType CGDebugInfo::CreateType(const TypedefType *Ty,
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llvm::DICompileUnit Unit) {
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// Typedefs are derived from some other type. If we have a typedef of a
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// typedef, make sure to emit the whole chain.
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llvm::DIType Src = getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit);
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// We don't set size information, but do specify where the typedef was
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// declared.
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std::string TyName = Ty->getDecl()->getNameAsString();
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SourceLocation DefLoc = Ty->getDecl()->getLocation();
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llvm::DICompileUnit DefUnit = getOrCreateCompileUnit(DefLoc);
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SourceManager &SM = M->getContext().getSourceManager();
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uint64_t Line = SM.getLogicalLineNumber(DefLoc);
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return DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_typedef, Unit,
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TyName, DefUnit, Line, 0, 0, 0, 0, Src);
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}
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llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
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llvm::DICompileUnit Unit) {
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llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
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// Add the result type at least.
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EltTys.push_back(getOrCreateType(Ty->getResultType(), Unit));
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// Set up remainder of arguments if there is a prototype.
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// FIXME: IF NOT, HOW IS THIS REPRESENTED? llvm-gcc doesn't represent '...'!
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if (const FunctionTypeProto *FTP = dyn_cast<FunctionTypeProto>(Ty)) {
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for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
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EltTys.push_back(getOrCreateType(FTP->getArgType(i), Unit));
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} else {
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// FIXME: Handle () case in C. llvm-gcc doesn't do it either.
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}
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llvm::DIArray EltTypeArray =
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DebugFactory.GetOrCreateArray(&EltTys[0], EltTys.size());
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return DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_subroutine_type,
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Unit, "", llvm::DICompileUnit(),
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0, 0, 0, 0, 0,
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llvm::DIType(), EltTypeArray);
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}
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/// getOrCreateRecordType - get structure or union type.
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llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty,
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llvm::DICompileUnit Unit) {
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RecordDecl *Decl = Ty->getDecl();
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unsigned Tag;
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if (Decl->isStruct())
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Tag = llvm::dwarf::DW_TAG_structure_type;
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else if (Decl->isUnion())
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Tag = llvm::dwarf::DW_TAG_union_type;
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else {
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assert(Decl->isClass() && "Unknown RecordType!");
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Tag = llvm::dwarf::DW_TAG_class_type;
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}
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SourceManager &SM = M->getContext().getSourceManager();
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// Get overall information about the record type for the debug info.
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std::string Name = Decl->getNameAsString();
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llvm::DICompileUnit DefUnit = getOrCreateCompileUnit(Decl->getLocation());
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uint64_t Line = SM.getLogicalLineNumber(Decl->getLocation());
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// Records and classes and unions can all be recursive. To handle them, we
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// first generate a debug descriptor for the struct as a forward declaration.
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// Then (if it is a definition) we go through and get debug info for all of
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// its members. Finally, we create a descriptor for the complete type (which
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// may refer to the forward decl if the struct is recursive) and replace all
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// uses of the forward declaration with the final definition.
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llvm::DIType FwdDecl =
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DebugFactory.CreateCompositeType(Tag, Unit, Name, DefUnit, Line, 0, 0, 0, 0,
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llvm::DIType(), llvm::DIArray());
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// If this is just a forward declaration, return it.
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if (!Decl->getDefinition(M->getContext()))
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return FwdDecl;
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// Otherwise, insert it into the TypeCache so that recursive uses will find
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// it.
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TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = FwdDecl;
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// Convert all the elements.
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llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
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const ASTRecordLayout &RL = M->getContext().getASTRecordLayout(Decl);
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unsigned FieldNo = 0;
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for (RecordDecl::field_iterator I = Decl->field_begin(),
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E = Decl->field_end();
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I != E; ++I, ++FieldNo) {
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FieldDecl *Field = *I;
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llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
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std::string FieldName = Field->getNameAsString();
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// Get the location for the field.
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SourceLocation FieldDefLoc = Field->getLocation();
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llvm::DICompileUnit FieldDefUnit = getOrCreateCompileUnit(FieldDefLoc);
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uint64_t FieldLine = SM.getLogicalLineNumber(FieldDefLoc);
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// Bit size, align and offset of the type.
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uint64_t FieldSize = M->getContext().getTypeSize(Ty);
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uint64_t FieldAlign = M->getContext().getTypeAlign(Ty);
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uint64_t FieldOffset = RL.getFieldOffset(FieldNo);
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// Create a DW_TAG_member node to remember the offset of this field in the
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// struct. FIXME: This is an absolutely insane way to capture this
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// information. When we gut debug info, this should be fixed.
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FieldTy = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
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FieldName, FieldDefUnit,
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FieldLine, FieldSize, FieldAlign,
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FieldOffset, 0, FieldTy);
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EltTys.push_back(FieldTy);
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}
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llvm::DIArray Elements =
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DebugFactory.GetOrCreateArray(&EltTys[0], EltTys.size());
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// Bit size, align and offset of the type.
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uint64_t Size = M->getContext().getTypeSize(Ty);
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uint64_t Align = M->getContext().getTypeAlign(Ty);
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llvm::DIType RealDecl =
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DebugFactory.CreateCompositeType(Tag, Unit, Name, DefUnit, Line, Size,
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Align, 0, 0, llvm::DIType(), Elements);
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// Now that we have a real decl for the struct, replace anything using the
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// old decl with the new one. This will recursively update the debug info.
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FwdDecl.getGV()->replaceAllUsesWith(RealDecl.getGV());
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FwdDecl.getGV()->eraseFromParent();
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return RealDecl;
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}
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llvm::DIType CGDebugInfo::CreateType(const EnumType *Ty,
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llvm::DICompileUnit Unit) {
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EnumDecl *Decl = Ty->getDecl();
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llvm::SmallVector<llvm::DIDescriptor, 32> Enumerators;
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// Create DIEnumerator elements for each enumerator.
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for (EnumDecl::enumerator_iterator Enum = Decl->enumerator_begin(),
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EnumEnd = Decl->enumerator_end();
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Enum != EnumEnd; ++Enum) {
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Enumerators.push_back(DebugFactory.CreateEnumerator(Enum->getNameAsString(),
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Enum->getInitVal().getZExtValue()));
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}
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// Return a CompositeType for the enum itself.
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llvm::DIArray EltArray =
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DebugFactory.GetOrCreateArray(&Enumerators[0], Enumerators.size());
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std::string EnumName = Decl->getNameAsString();
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SourceLocation DefLoc = Decl->getLocation();
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llvm::DICompileUnit DefUnit = getOrCreateCompileUnit(DefLoc);
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SourceManager &SM = M->getContext().getSourceManager();
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uint64_t Line = SM.getLogicalLineNumber(DefLoc);
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// Size and align of the type.
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uint64_t Size = M->getContext().getTypeSize(Ty);
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uint64_t Align = M->getContext().getTypeAlign(Ty);
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return DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_enumeration_type,
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Unit, EnumName, DefUnit, Line,
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Size, Align, 0, 0,
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llvm::DIType(), EltArray);
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}
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llvm::DIType CGDebugInfo::CreateType(const TagType *Ty,
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llvm::DICompileUnit Unit) {
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if (const RecordType *RT = dyn_cast<RecordType>(Ty))
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return CreateType(RT, Unit);
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else if (const EnumType *ET = dyn_cast<EnumType>(Ty))
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return CreateType(ET, Unit);
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return llvm::DIType();
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}
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llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty,
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llvm::DICompileUnit Unit) {
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uint64_t Size;
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uint64_t Align;
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if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
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Size = 0;
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Align =
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M->getContext().getTypeSize(M->getContext().getBaseElementType(VAT));
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} else {
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// Size and align of the whole array, not the element type.
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Size = M->getContext().getTypeSize(Ty);
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Align = M->getContext().getTypeAlign(Ty);
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}
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// Add the dimensions of the array. FIXME: This loses CV qualifiers from
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// interior arrays, do we care? Why aren't nested arrays represented the
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// obvious/recursive way?
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llvm::SmallVector<llvm::DIDescriptor, 8> Subscripts;
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QualType EltTy(Ty, 0);
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while ((Ty = dyn_cast<ArrayType>(EltTy))) {
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uint64_t Upper = 0;
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if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
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Upper = CAT->getSize().getZExtValue() - 1;
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// FIXME: Verify this is right for VLAs.
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Subscripts.push_back(DebugFactory.GetOrCreateSubrange(0, Upper));
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EltTy = Ty->getElementType();
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}
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llvm::DIArray SubscriptArray =
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DebugFactory.GetOrCreateArray(&Subscripts[0], Subscripts.size());
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return DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_array_type,
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Unit, "", llvm::DICompileUnit(),
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0, Size, Align, 0, 0,
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getOrCreateType(EltTy, Unit),
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SubscriptArray);
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}
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/// getOrCreateType - Get the type from the cache or create a new
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/// one if necessary.
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llvm::DIType CGDebugInfo::getOrCreateType(QualType Ty,
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llvm::DICompileUnit Unit) {
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if (Ty.isNull())
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return llvm::DIType();
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// Check to see if the compile unit already has created this type.
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llvm::DIType &Slot = TypeCache[Ty.getAsOpaquePtr()];
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if (!Slot.isNull()) return Slot;
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// Handle CVR qualifiers, which recursively handles what they refer to.
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if (Ty.getCVRQualifiers())
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return Slot = CreateCVRType(Ty, Unit);
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// Work out details of type.
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switch (Ty->getTypeClass()) {
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case Type::Complex:
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case Type::Reference:
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case Type::Vector:
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case Type::ExtVector:
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case Type::ASQual:
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case Type::ObjCInterface:
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case Type::ObjCQualifiedInterface:
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case Type::ObjCQualifiedId:
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default:
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return llvm::DIType();
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case Type::Builtin: Slot = CreateType(cast<BuiltinType>(Ty), Unit); break;
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case Type::Pointer: Slot = CreateType(cast<PointerType>(Ty), Unit); break;
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case Type::TypeName: Slot = CreateType(cast<TypedefType>(Ty), Unit); break;
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case Type::Tagged: Slot = CreateType(cast<TagType>(Ty), Unit); break;
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case Type::FunctionProto:
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case Type::FunctionNoProto:
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return Slot = CreateType(cast<FunctionType>(Ty), Unit);
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case Type::ConstantArray:
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case Type::VariableArray:
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case Type::IncompleteArray:
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return Slot = CreateType(cast<ArrayType>(Ty), Unit);
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case Type::TypeOfExp:
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return Slot = getOrCreateType(cast<TypeOfExpr>(Ty)->getUnderlyingExpr()
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->getType(), Unit);
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case Type::TypeOfTyp:
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return Slot = getOrCreateType(cast<TypeOfType>(Ty)->getUnderlyingType(),
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Unit);
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}
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return Slot;
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}
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/// EmitFunctionStart - Constructs the debug code for entering a function -
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/// "llvm.dbg.func.start.".
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void CGDebugInfo::EmitFunctionStart(const char *Name, QualType ReturnType,
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llvm::Function *Fn,
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CGBuilderTy &Builder) {
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// FIXME: Why is this using CurLoc???
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llvm::DICompileUnit Unit = getOrCreateCompileUnit(CurLoc);
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SourceManager &SM = M->getContext().getSourceManager();
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uint64_t LineNo = SM.getLogicalLineNumber(CurLoc);
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llvm::DISubprogram SP =
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DebugFactory.CreateSubprogram(Unit, Name, Name, "", Unit, LineNo,
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getOrCreateType(ReturnType, Unit),
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Fn->hasInternalLinkage(), true/*definition*/);
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DebugFactory.InsertSubprogramStart(SP, Builder.GetInsertBlock());
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// Push function on region stack.
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RegionStack.push_back(SP);
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}
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void CGDebugInfo::EmitStopPoint(llvm::Function *Fn, CGBuilderTy &Builder) {
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if (CurLoc.isInvalid() || CurLoc.isMacroID()) return;
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// Don't bother if things are the same as last time.
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SourceManager &SM = M->getContext().getSourceManager();
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if (CurLoc == PrevLoc
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|| (SM.getLineNumber(CurLoc) == SM.getLineNumber(PrevLoc)
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&& SM.isFromSameFile(CurLoc, PrevLoc)))
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return;
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// Update last state.
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PrevLoc = CurLoc;
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// Get the appropriate compile unit.
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llvm::DICompileUnit Unit = getOrCreateCompileUnit(CurLoc);
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DebugFactory.InsertStopPoint(Unit, SM.getLogicalLineNumber(CurLoc),
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SM.getLogicalColumnNumber(CurLoc),
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Builder.GetInsertBlock());
|
|
}
|
|
|
|
/// EmitRegionStart- Constructs the debug code for entering a declarative
|
|
/// region - "llvm.dbg.region.start.".
|
|
void CGDebugInfo::EmitRegionStart(llvm::Function *Fn, CGBuilderTy &Builder) {
|
|
llvm::DIDescriptor D;
|
|
if (!RegionStack.empty())
|
|
D = RegionStack.back();
|
|
D = DebugFactory.CreateBlock(D);
|
|
RegionStack.push_back(D);
|
|
DebugFactory.InsertRegionStart(D, Builder.GetInsertBlock());
|
|
}
|
|
|
|
/// EmitRegionEnd - Constructs the debug code for exiting a declarative
|
|
/// region - "llvm.dbg.region.end."
|
|
void CGDebugInfo::EmitRegionEnd(llvm::Function *Fn, CGBuilderTy &Builder) {
|
|
assert(!RegionStack.empty() && "Region stack mismatch, stack empty!");
|
|
|
|
// Provide an region stop point.
|
|
EmitStopPoint(Fn, Builder);
|
|
|
|
DebugFactory.InsertRegionEnd(RegionStack.back(), Builder.GetInsertBlock());
|
|
RegionStack.pop_back();
|
|
}
|
|
|
|
/// EmitDeclare - Emit local variable declaration debug info.
|
|
void CGDebugInfo::EmitDeclare(const VarDecl *Decl, unsigned Tag,
|
|
llvm::Value *Storage, CGBuilderTy &Builder) {
|
|
assert(!RegionStack.empty() && "Region stack mismatch, stack empty!");
|
|
|
|
// Get location information.
|
|
SourceManager &SM = M->getContext().getSourceManager();
|
|
uint64_t Line = SM.getLogicalLineNumber(Decl->getLocation());
|
|
llvm::DICompileUnit Unit = getOrCreateCompileUnit(Decl->getLocation());
|
|
|
|
// Create the descriptor for the variable.
|
|
llvm::DIVariable D =
|
|
DebugFactory.CreateVariable(Tag, RegionStack.back(),Decl->getNameAsString(),
|
|
Unit, Line,
|
|
getOrCreateType(Decl->getType(), Unit));
|
|
// Insert an llvm.dbg.declare into the current block.
|
|
DebugFactory.InsertDeclare(Storage, D, Builder.GetInsertBlock());
|
|
}
|
|
|
|
void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *Decl,
|
|
llvm::Value *Storage,
|
|
CGBuilderTy &Builder) {
|
|
EmitDeclare(Decl, llvm::dwarf::DW_TAG_auto_variable, Storage, Builder);
|
|
}
|
|
|
|
/// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
|
|
/// variable declaration.
|
|
void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
|
|
CGBuilderTy &Builder) {
|
|
EmitDeclare(Decl, llvm::dwarf::DW_TAG_arg_variable, AI, Builder);
|
|
}
|
|
|
|
|
|
|
|
/// EmitGlobalVariable - Emit information about a global variable.
|
|
void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
|
|
const VarDecl *Decl) {
|
|
// Create global variable debug descriptor.
|
|
llvm::DICompileUnit Unit = getOrCreateCompileUnit(Decl->getLocation());
|
|
SourceManager &SM = M->getContext().getSourceManager();
|
|
uint64_t LineNo = SM.getLogicalLineNumber(Decl->getLocation());
|
|
|
|
std::string Name = Decl->getNameAsString();
|
|
|
|
QualType T = Decl->getType();
|
|
if (T->isIncompleteArrayType()) {
|
|
|
|
// CodeGen turns int[] into int[1] so we'll do the same here.
|
|
llvm::APSInt ConstVal(32);
|
|
|
|
ConstVal = 1;
|
|
QualType ET = M->getContext().getAsArrayType(T)->getElementType();
|
|
|
|
T = M->getContext().getConstantArrayType(ET, ConstVal,
|
|
ArrayType::Normal, 0);
|
|
}
|
|
|
|
DebugFactory.CreateGlobalVariable(Unit, Name, Name, "", Unit, LineNo,
|
|
getOrCreateType(T, Unit),
|
|
Var->hasInternalLinkage(),
|
|
true/*definition*/, Var);
|
|
}
|
|
|