llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h

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//===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing dwarf debug info into asm files.
//
//===----------------------------------------------------------------------===//
#ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__
#define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
#include "DIE.h"
#include "DwarfPrinter.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/UniqueVector.h"
#include <string>
namespace llvm {
class CompileUnit;
class DbgConcreteScope;
class DbgScope;
class DbgVariable;
class MachineFrameInfo;
class MachineModuleInfo;
class MCAsmInfo;
class Timer;
//===----------------------------------------------------------------------===//
/// SrcLineInfo - This class is used to record source line correspondence.
///
class SrcLineInfo {
unsigned Line; // Source line number.
unsigned Column; // Source column.
unsigned SourceID; // Source ID number.
unsigned LabelID; // Label in code ID number.
public:
SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
: Line(L), Column(C), SourceID(S), LabelID(I) {}
// Accessors
unsigned getLine() const { return Line; }
unsigned getColumn() const { return Column; }
unsigned getSourceID() const { return SourceID; }
unsigned getLabelID() const { return LabelID; }
};
class DwarfDebug : public Dwarf {
//===--------------------------------------------------------------------===//
// Attributes used to construct specific Dwarf sections.
//
/// CompileUnitMap - A map of global variables representing compile units to
/// compile units.
DenseMap<Value *, CompileUnit *> CompileUnitMap;
/// CompileUnits - All the compile units in this module.
///
SmallVector<CompileUnit *, 8> CompileUnits;
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/// ModuleCU - All DIEs are inserted in ModuleCU.
CompileUnit *ModuleCU;
/// AbbreviationsSet - Used to uniquely define abbreviations.
///
FoldingSet<DIEAbbrev> AbbreviationsSet;
/// Abbreviations - A list of all the unique abbreviations in use.
///
std::vector<DIEAbbrev *> Abbreviations;
/// DirectoryIdMap - Directory name to directory id map.
///
StringMap<unsigned> DirectoryIdMap;
/// DirectoryNames - A list of directory names.
SmallVector<std::string, 8> DirectoryNames;
/// SourceFileIdMap - Source file name to source file id map.
///
StringMap<unsigned> SourceFileIdMap;
/// SourceFileNames - A list of source file names.
SmallVector<std::string, 8> SourceFileNames;
/// SourceIdMap - Source id map, i.e. pair of directory id and source file
/// id mapped to a unique id.
DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
/// SourceIds - Reverse map from source id to directory id + file id pair.
///
SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
/// Lines - List of of source line correspondence.
std::vector<SrcLineInfo> Lines;
/// DIEValues - A list of all the unique values in use.
///
std::vector<DIEValue *> DIEValues;
/// StringPool - A UniqueVector of strings used by indirect references.
///
UniqueVector<std::string> StringPool;
/// SectionMap - Provides a unique id per text section.
///
UniqueVector<const MCSection*> SectionMap;
/// SectionSourceLines - Tracks line numbers per text section.
///
std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
/// didInitial - Flag to indicate if initial emission has been done.
///
bool didInitial;
/// shouldEmit - Flag to indicate if debug information should be emitted.
///
bool shouldEmit;
// CurrentFnDbgScope - Top level scope for the current function.
//
DbgScope *CurrentFnDbgScope;
/// DbgScopeMap - Tracks the scopes in the current function.
///
DenseMap<MDNode *, DbgScope *> DbgScopeMap;
/// ConcreteScopes - Tracks the concrete scopees in the current function.
/// These scopes are also included in DbgScopeMap.
DenseMap<MDNode *, DbgScope *> ConcreteScopes;
/// AbstractScopes - Tracks the abstract scopes a module. These scopes are
/// not included DbgScopeMap.
DenseMap<MDNode *, DbgScope *> AbstractScopes;
SmallVector<DbgScope *, 4>AbstractScopesList;
/// AbstractVariables - Collection on abstract variables.
DenseMap<MDNode *, DbgVariable *> AbstractVariables;
/// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
/// (at the end of the module) as DW_AT_inline.
SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
DenseMap<DIE *, MDNode *> ContainingTypeMap;
/// AbstractSubprogramDIEs - Collection of abstruct subprogram DIEs.
SmallPtrSet<DIE *, 4> AbstractSubprogramDIEs;
/// TopLevelDIEs - Collection of top level DIEs.
SmallPtrSet<DIE *, 4> TopLevelDIEs;
SmallVector<DIE *, 4> TopLevelDIEsVector;
typedef SmallVector<DbgScope *, 2> ScopeVector;
typedef DenseMap<const MachineInstr *, ScopeVector>
InsnToDbgScopeMapTy;
/// DbgScopeBeginMap - Maps instruction with a list of DbgScopes it starts.
InsnToDbgScopeMapTy DbgScopeBeginMap;
/// DbgScopeEndMap - Maps instruction with a list DbgScopes it ends.
InsnToDbgScopeMapTy DbgScopeEndMap;
/// InlineInfo - Keep track of inlined functions and their location. This
/// information is used to populate debug_inlined section.
typedef std::pair<unsigned, DIE *> InlineInfoLabels;
DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
SmallVector<MDNode *, 4> InlinedSPNodes;
/// CompileUnitOffsets - A vector of the offsets of the compile units. This is
/// used when calculating the "origin" of a concrete instance of an inlined
/// function.
DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;
/// DebugTimer - Timer for the Dwarf debug writer.
Timer *DebugTimer;
struct FunctionDebugFrameInfo {
unsigned Number;
std::vector<MachineMove> Moves;
FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
: Number(Num), Moves(M) {}
};
std::vector<FunctionDebugFrameInfo> DebugFrames;
/// getSourceDirectoryAndFileIds - Return the directory and file ids that
/// maps to the source id. Source id starts at 1.
std::pair<unsigned, unsigned>
getSourceDirectoryAndFileIds(unsigned SId) const {
return SourceIds[SId-1];
}
/// getNumSourceDirectories - Return the number of source directories in the
/// debug info.
unsigned getNumSourceDirectories() const {
return DirectoryNames.size();
}
/// getSourceDirectoryName - Return the name of the directory corresponding
/// to the id.
const std::string &getSourceDirectoryName(unsigned Id) const {
return DirectoryNames[Id - 1];
}
/// getSourceFileName - Return the name of the source file corresponding
/// to the id.
const std::string &getSourceFileName(unsigned Id) const {
return SourceFileNames[Id - 1];
}
/// getNumSourceIds - Return the number of unique source ids.
unsigned getNumSourceIds() const {
return SourceIds.size();
}
/// assignAbbrevNumber - Define a unique number for the abbreviation.
///
void assignAbbrevNumber(DIEAbbrev &Abbrev);
/// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
/// information entry.
DIEEntry *createDIEEntry(DIE *Entry = NULL);
/// addUInt - Add an unsigned integer attribute data and value.
///
void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
/// addSInt - Add an signed integer attribute data and value.
///
void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
/// addString - Add a string attribute data and value.
///
void addString(DIE *Die, unsigned Attribute, unsigned Form,
const StringRef Str);
/// addLabel - Add a Dwarf label attribute data and value.
///
void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
const DWLabel &Label);
/// addObjectLabel - Add an non-Dwarf label attribute data and value.
///
void addObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
const MCSymbol *Sym);
/// addSectionOffset - Add a section offset label attribute data and value.
///
void addSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
const DWLabel &Label, const DWLabel &Section,
bool isEH = false, bool useSet = true);
/// addDelta - Add a label delta attribute data and value.
///
void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
const DWLabel &Hi, const DWLabel &Lo);
/// addDIEEntry - Add a DIE attribute data and value.
///
void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
Die->addValue(Attribute, Form, createDIEEntry(Entry));
}
/// addBlock - Add block data.
///
void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
/// addSourceLine - Add location information to specified debug information
/// entry.
void addSourceLine(DIE *Die, const DIVariable *V);
void addSourceLine(DIE *Die, const DIGlobal *G);
void addSourceLine(DIE *Die, const DISubprogram *SP);
void addSourceLine(DIE *Die, const DIType *Ty);
void addSourceLine(DIE *Die, const DINameSpace *NS);
/// addAddress - Add an address attribute to a die based on the location
/// provided.
void addAddress(DIE *Die, unsigned Attribute,
const MachineLocation &Location);
/// addComplexAddress - Start with the address based on the location provided,
/// and generate the DWARF information necessary to find the actual variable
/// (navigating the extra location information encoded in the type) based on
/// the starting location. Add the DWARF information to the die.
///
void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
const MachineLocation &Location);
// FIXME: Should be reformulated in terms of addComplexAddress.
/// addBlockByrefAddress - Start with the address based on the location
/// provided, and generate the DWARF information necessary to find the
/// actual Block variable (navigating the Block struct) based on the
/// starting location. Add the DWARF information to the die. Obsolete,
/// please use addComplexAddress instead.
///
void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
const MachineLocation &Location);
/// addToContextOwner - Add Die into the list of its context owner's children.
void addToContextOwner(DIE *Die, DIDescriptor Context);
/// addType - Add a new type attribute to the specified entity.
void addType(DIE *Entity, DIType Ty);
/// getOrCreateNameSpace - Create a DIE for DINameSpace.
DIE *getOrCreateNameSpace(DINameSpace NS);
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/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
/// given DIType.
DIE *getOrCreateTypeDIE(DIType Ty);
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void addPubTypes(DISubprogram SP);
/// constructTypeDIE - Construct basic type die from DIBasicType.
void constructTypeDIE(DIE &Buffer,
DIBasicType BTy);
/// constructTypeDIE - Construct derived type die from DIDerivedType.
void constructTypeDIE(DIE &Buffer,
DIDerivedType DTy);
/// constructTypeDIE - Construct type DIE from DICompositeType.
void constructTypeDIE(DIE &Buffer,
DICompositeType CTy);
/// constructSubrangeDIE - Construct subrange DIE from DISubrange.
void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
/// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
void constructArrayTypeDIE(DIE &Buffer,
DICompositeType *CTy);
/// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
DIE *constructEnumTypeDIE(DIEnumerator *ETy);
/// createGlobalVariableDIE - Create new DIE using GV.
DIE *createGlobalVariableDIE(const DIGlobalVariable &GV);
/// createMemberDIE - Create new member DIE.
DIE *createMemberDIE(const DIDerivedType &DT);
/// createSubprogramDIE - Create new DIE using SP.
DIE *createSubprogramDIE(const DISubprogram &SP, bool MakeDecl = false);
/// findCompileUnit - Get the compile unit for the given descriptor.
///
CompileUnit *findCompileUnit(DICompileUnit Unit);
/// getUpdatedDbgScope - Find or create DbgScope assicated with
/// the instruction. Initialize scope and update scope hierarchy.
DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
/// createDbgScope - Create DbgScope for the scope.
void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
DbgScope *getOrCreateAbstractScope(MDNode *N);
/// findAbstractVariable - Find abstract variable associated with Var.
DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx,
DILocation &Loc);
/// updateSubprogramScopeDIE - Find DIE for the given subprogram and
/// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
/// If there are global variables in this scope then create and insert
/// DIEs for these variables.
DIE *updateSubprogramScopeDIE(MDNode *SPNode);
/// constructLexicalScope - Construct new DW_TAG_lexical_block
/// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
DIE *constructLexicalScopeDIE(DbgScope *Scope);
/// constructInlinedScopeDIE - This scope represents inlined body of
/// a function. Construct DIE to represent this concrete inlined copy
/// of the function.
DIE *constructInlinedScopeDIE(DbgScope *Scope);
/// constructVariableDIE - Construct a DIE for the given DbgVariable.
DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
/// constructScopeDIE - Construct a DIE for this scope.
DIE *constructScopeDIE(DbgScope *Scope);
/// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
/// tools to recognize the object file contains Dwarf information.
void emitInitial();
/// emitDIE - Recusively Emits a debug information entry.
///
void emitDIE(DIE *Die);
/// computeSizeAndOffset - Compute the size and offset of a DIE.
///
unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
/// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
///
void computeSizeAndOffsets();
/// EmitDebugInfo - Emit the debug info section.
///
void emitDebugInfo();
/// emitAbbreviations - Emit the abbreviation section.
///
void emitAbbreviations() const;
/// emitEndOfLineMatrix - Emit the last address of the section and the end of
/// the line matrix.
///
void emitEndOfLineMatrix(unsigned SectionEnd);
/// emitDebugLines - Emit source line information.
///
void emitDebugLines();
/// emitCommonDebugFrame - Emit common frame info into a debug frame section.
///
void emitCommonDebugFrame();
/// emitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
/// emitDebugPubNames - Emit visible names into a debug pubnames section.
///
void emitDebugPubNames();
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/// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
///
void emitDebugPubTypes();
/// emitDebugStr - Emit visible names into a debug str section.
///
void emitDebugStr();
/// emitDebugLoc - Emit visible names into a debug loc section.
///
void emitDebugLoc();
/// EmitDebugARanges - Emit visible names into a debug aranges section.
///
void EmitDebugARanges();
/// emitDebugRanges - Emit visible names into a debug ranges section.
///
void emitDebugRanges();
/// emitDebugMacInfo - Emit visible names into a debug macinfo section.
///
void emitDebugMacInfo();
/// emitDebugInlineInfo - Emit inline info using following format.
/// Section Header:
/// 1. length of section
/// 2. Dwarf version number
/// 3. address size.
///
/// Entries (one "entry" for each function that was inlined):
///
/// 1. offset into __debug_str section for MIPS linkage name, if exists;
/// otherwise offset into __debug_str for regular function name.
/// 2. offset into __debug_str section for regular function name.
/// 3. an unsigned LEB128 number indicating the number of distinct inlining
/// instances for the function.
///
/// The rest of the entry consists of a {die_offset, low_pc} pair for each
/// inlined instance; the die_offset points to the inlined_subroutine die in
/// the __debug_info section, and the low_pc is the starting address for the
/// inlining instance.
void emitDebugInlineInfo();
/// GetOrCreateSourceID - Look up the source id with the given directory and
/// source file names. If none currently exists, create a new id and insert it
/// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
/// as well.
unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
CompileUnit *constructCompileUnit(MDNode *N);
void constructGlobalVariableDIE(MDNode *N);
void constructSubprogramDIE(MDNode *N);
// FIXME: This should go away in favor of complex addresses.
/// Find the type the programmer originally declared the variable to be
/// and return that type. Obsolete, use GetComplexAddrType instead.
///
DIType getBlockByrefType(DIType Ty, std::string Name);
public:
//===--------------------------------------------------------------------===//
// Main entry points.
//
DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
virtual ~DwarfDebug();
/// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
/// be emitted.
bool ShouldEmitDwarfDebug() const { return shouldEmit; }
/// beginModule - Emit all Dwarf sections that should come prior to the
/// content.
void beginModule(Module *M, MachineModuleInfo *MMI);
/// endModule - Emit all Dwarf sections that should come after the content.
///
void endModule();
/// beginFunction - Gather pre-function debug information. Assumes being
/// emitted immediately after the function entry point.
void beginFunction(MachineFunction *MF);
/// endFunction - Gather and emit post-function debug information.
///
void endFunction(MachineFunction *MF);
/// recordSourceLine - Records location information and associates it with a
/// label. Returns a unique label ID used to generate a label and provide
/// correspondence to the source line list.
unsigned recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
/// getSourceLineCount - Return the number of source lines in the debug
/// info.
unsigned getSourceLineCount() const {
return Lines.size();
}
/// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
/// timed. Look up the source id with the given directory and source file
/// names. If none currently exists, create a new id and insert it in the
/// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
/// well.
unsigned getOrCreateSourceID(const std::string &DirName,
const std::string &FileName);
/// extractScopeInformation - Scan machine instructions in this function
/// and collect DbgScopes. Return true, if atleast one scope was found.
bool extractScopeInformation(MachineFunction *MF);
/// collectVariableInfo - Populate DbgScope entries with variables' info.
void collectVariableInfo();
/// beginScope - Process beginning of a scope starting at Label.
void beginScope(const MachineInstr *MI, unsigned Label);
/// endScope - Prcess end of a scope.
void endScope(const MachineInstr *MI);
};
} // End of namespace llvm
#endif