llvm-6502/lib/CodeGen/AsmPrinter/DwarfDebug.h
Jakob Stoklund Olesen adb877d62e Collect and coalesce DBG_VALUE instructions before emitting the function.
Correctly terminate the range of register DBG_VALUEs when the register is
clobbered or when the basic block ends.

The code is now ready to deal with variables that are sometimes in a register
and sometimes on the stack. We just need to teach emitDebugLoc to say 'stack
slot'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128327 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-26 02:19:36 +00:00

619 lines
22 KiB
C++

//===-- 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 "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "DIE.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/UniqueVector.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/DebugLoc.h"
namespace llvm {
class CompileUnit;
class DbgConcreteScope;
class DbgScope;
class DbgVariable;
class MachineFrameInfo;
class MachineModuleInfo;
class MachineOperand;
class MCAsmInfo;
class DIEAbbrev;
class DIE;
class DIEBlock;
class DIEEntry;
class DIEnumerator;
class DIDescriptor;
class DIVariable;
class DIGlobal;
class DIGlobalVariable;
class DISubprogram;
class DIBasicType;
class DIDerivedType;
class DIType;
class DINameSpace;
class DISubrange;
class DICompositeType;
class DITemplateTypeParameter;
class DITemplateValueParameter;
//===----------------------------------------------------------------------===//
/// 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.
MCSymbol *Label; // Label in code ID number.
public:
SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
: Line(L), Column(C), SourceID(S), Label(label) {}
// Accessors
unsigned getLine() const { return Line; }
unsigned getColumn() const { return Column; }
unsigned getSourceID() const { return SourceID; }
MCSymbol *getLabel() const { return Label; }
};
/// DotDebugLocEntry - This struct describes location entries emitted in
/// .debug_loc section.
typedef struct DotDebugLocEntry {
const MCSymbol *Begin;
const MCSymbol *End;
MachineLocation Loc;
bool Merged;
DotDebugLocEntry() : Begin(0), End(0), Merged(false) {}
DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L)
: Begin(B), End(E), Loc(L), Merged(false) {}
/// Empty entries are also used as a trigger to emit temp label. Such
/// labels are referenced is used to find debug_loc offset for a given DIE.
bool isEmpty() { return Begin == 0 && End == 0; }
bool isMerged() { return Merged; }
void Merge(DotDebugLocEntry *Next) {
if (!(Begin && Loc == Next->Loc && End == Next->Begin))
return;
Next->Begin = Begin;
Merged = true;
}
} DotDebugLocEntry;
class DwarfDebug {
/// Asm - Target of Dwarf emission.
AsmPrinter *Asm;
/// MMI - Collected machine module information.
MachineModuleInfo *MMI;
//===--------------------------------------------------------------------===//
// Attributes used to construct specific Dwarf sections.
//
CompileUnit *FirstCU;
DenseMap <const MDNode *, CompileUnit *> CUMap;
/// AbbreviationsSet - Used to uniquely define abbreviations.
///
FoldingSet<DIEAbbrev> AbbreviationsSet;
/// Abbreviations - A list of all the unique abbreviations in use.
///
std::vector<DIEAbbrev *> Abbreviations;
/// SourceIdMap - Source id map, i.e. pair of directory id and source file
/// id mapped to a unique id.
StringMap<unsigned> SourceIdMap;
/// DIEBlocks - A list of all the DIEBlocks in use.
std::vector<DIEBlock *> DIEBlocks;
// DIEValueAllocator - All DIEValues are allocated through this allocator.
BumpPtrAllocator DIEValueAllocator;
/// StringPool - A String->Symbol mapping of strings used by indirect
/// references.
StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
unsigned NextStringPoolNumber;
MCSymbol *getStringPoolEntry(StringRef Str);
/// SectionMap - Provides a unique id per text section.
///
UniqueVector<const MCSection*> SectionMap;
/// CurrentFnDbgScope - Top level scope for the current function.
///
DbgScope *CurrentFnDbgScope;
/// CurrentFnArguments - List of Arguments (DbgValues) for current function.
SmallVector<DbgVariable *, 8> CurrentFnArguments;
/// DbgScopeMap - Tracks the scopes in the current function. Owns the
/// contained DbgScope*s.
///
DenseMap<const MDNode *, DbgScope *> DbgScopeMap;
/// ConcreteScopes - Tracks the concrete scopees in the current function.
/// These scopes are also included in DbgScopeMap.
DenseMap<const MDNode *, DbgScope *> ConcreteScopes;
/// AbstractScopes - Tracks the abstract scopes a module. These scopes are
/// not included DbgScopeMap. AbstractScopes owns its DbgScope*s.
DenseMap<const MDNode *, DbgScope *> AbstractScopes;
/// AbstractSPDies - Collection of abstract subprogram DIEs.
DenseMap<const MDNode *, DIE *> AbstractSPDies;
/// AbstractScopesList - Tracks abstract scopes constructed while processing
/// a function. This list is cleared during endFunction().
SmallVector<DbgScope *, 4>AbstractScopesList;
/// AbstractVariables - Collection on abstract variables. Owned by the
/// DbgScopes in AbstractScopes.
DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
/// DbgVariableToFrameIndexMap - Tracks frame index used to find
/// variable's value.
DenseMap<const DbgVariable *, int> DbgVariableToFrameIndexMap;
/// DbgVariableToDbgInstMap - Maps DbgVariable to corresponding DBG_VALUE
/// machine instruction.
DenseMap<const DbgVariable *, const MachineInstr *> DbgVariableToDbgInstMap;
/// DotDebugLocEntries - Collection of DotDebugLocEntry.
SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
/// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
/// idetifies corresponding .debug_loc entry offset.
SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
/// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
/// DbgVariable, if any.
DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
/// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
/// (at the end of the module) as DW_AT_inline.
SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
/// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
/// need DW_AT_containing_type attribute. This attribute points to a DIE that
/// corresponds to the MDNode mapped with the subprogram DIE.
DenseMap<DIE *, const MDNode *> ContainingTypeMap;
typedef SmallVector<DbgScope *, 2> ScopeVector;
/// InlineInfo - Keep track of inlined functions and their location. This
/// information is used to populate debug_inlined section.
typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
SmallVector<const MDNode *, 4> InlinedSPNodes;
// ProcessedSPNodes - This is a collection of subprogram MDNodes that
// are processed to create DIEs.
SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
/// LabelsBeforeInsn - Maps instruction with label emitted before
/// instruction.
DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
/// LabelsAfterInsn - Maps instruction with label emitted after
/// instruction.
DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
/// UserVariables - Every user variable mentioned by a DBG_VALUE instruction
/// in order of appearance.
SmallVector<const MDNode*, 8> UserVariables;
/// DbgValues - For each user variable, keep a list of DBG_VALUE
/// instructions in order. The list can also contain normal instructions that
/// clobber the previous DBG_VALUE.
typedef DenseMap<const MDNode*, SmallVector<const MachineInstr*, 4> >
DbgValueHistoryMap;
DbgValueHistoryMap DbgValues;
SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
/// Previous instruction's location information. This is used to determine
/// label location to indicate scope boundries in dwarf debug info.
DebugLoc PrevInstLoc;
MCSymbol *PrevLabel;
struct FunctionDebugFrameInfo {
unsigned Number;
std::vector<MachineMove> Moves;
FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
: Number(Num), Moves(M) {}
};
std::vector<FunctionDebugFrameInfo> DebugFrames;
// Section Symbols: these are assembler temporary labels that are emitted at
// the beginning of each supported dwarf section. These are used to form
// section offsets and are created by EmitSectionLabels.
MCSymbol *DwarfFrameSectionSym, *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
MCSymbol *DwarfDebugLocSectionSym;
MCSymbol *FunctionBeginSym, *FunctionEndSym;
DIEInteger *DIEIntegerOne;
private:
/// getNumSourceIds - Return the number of unique source ids.
unsigned getNumSourceIds() const {
return SourceIdMap.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);
/// 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 MCSymbol *Label);
/// addDelta - Add a label delta attribute data and value.
///
void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
const MCSymbol *Hi, const MCSymbol *Lo);
/// addDIEEntry - Add a DIE attribute data and value.
///
void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *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, DIVariable V);
void addSourceLine(DIE *Die, DIGlobalVariable G);
void addSourceLine(DIE *Die, DISubprogram SP);
void addSourceLine(DIE *Die, DIType Ty);
void addSourceLine(DIE *Die, DINameSpace NS);
/// addAddress - Add an address attribute to a die based on the location
/// provided.
void addAddress(DIE *Die, unsigned Attribute,
const MachineLocation &Location);
/// addRegisterAddress - Add register location entry in variable DIE.
bool addRegisterAddress(DIE *Die, const MachineOperand &MO);
/// addConstantValue - Add constant value entry in variable DIE.
bool addConstantValue(DIE *Die, const MachineOperand &MO);
bool addConstantValue(DIE *Die, ConstantInt *CI, bool Unsigned);
/// addConstantFPValue - Add constant value entry in variable DIE.
bool addConstantFPValue(DIE *Die, const MachineOperand &MO);
/// 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);
/// addVariableAddress - Add DW_AT_location attribute for a DbgVariable based
/// on provided frame index.
void addVariableAddress(DbgVariable *&DV, DIE *Die, int64_t FI);
/// 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);
/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
/// given DIType.
DIE *getOrCreateTypeDIE(DIType Ty);
/// getOrCreateTemplateTypeParameterDIE - Find existing DIE or create new DIE
/// for the given DITemplateTypeParameter.
DIE *getOrCreateTemplateTypeParameterDIE(DITemplateTypeParameter TP);
/// getOrCreateTemplateValueParameterDIE - Find existing DIE or create new DIE
/// for the given DITemplateValueParameter.
DIE *getOrCreateTemplateValueParameterDIE(DITemplateValueParameter TVP);
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);
/// createMemberDIE - Create new member DIE.
DIE *createMemberDIE(DIDerivedType DT);
/// createSubprogramDIE - Create new DIE using SP.
DIE *createSubprogramDIE(DISubprogram SP);
/// getOrCreateDbgScope - Create DbgScope for the scope.
DbgScope *getOrCreateDbgScope(const MDNode *Scope, const MDNode *InlinedAt);
DbgScope *getOrCreateAbstractScope(const MDNode *N);
/// findAbstractVariable - Find abstract variable associated with Var.
DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc 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(const 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);
/// EmitSectionLabels - Emit initial Dwarf sections with a label at
/// the start of each one.
void EmitSectionLabels();
/// 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);
/// 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();
/// 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.
unsigned GetOrCreateSourceID(StringRef DirName, StringRef FullName);
/// constructCompileUnit - Create new CompileUnit for the given
/// metadata node with tag DW_TAG_compile_unit.
void constructCompileUnit(const MDNode *N);
/// getCompielUnit - Get CompileUnit DIE.
CompileUnit *getCompileUnit(const MDNode *N) const;
/// constructGlobalVariableDIE - Construct global variable DIE.
void constructGlobalVariableDIE(const MDNode *N);
/// construct SubprogramDIE - Construct subprogram DIE.
void constructSubprogramDIE(const MDNode *N);
/// recordSourceLine - Register a source line with debug info. Returns the
/// unique label that was emitted and which provides correspondence to
/// the source line list.
void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope);
/// recordVariableFrameIndex - Record a variable's index.
void recordVariableFrameIndex(const DbgVariable *V, int Index);
/// findVariableFrameIndex - Return true if frame index for the variable
/// is found. Update FI to hold value of the index.
bool findVariableFrameIndex(const DbgVariable *V, int *FI);
/// findDbgScope - Find DbgScope for the debug loc attached with an
/// instruction.
DbgScope *findDbgScope(const MachineInstr *MI);
/// identifyScopeMarkers() - Indentify instructions that are marking
/// beginning of or end of a scope.
void identifyScopeMarkers();
/// extractScopeInformation - Scan machine instructions in this function
/// and collect DbgScopes. Return true, if atleast one scope was found.
bool extractScopeInformation();
/// addCurrentFnArgument - If Var is an current function argument that add
/// it in CurrentFnArguments list.
bool addCurrentFnArgument(const MachineFunction *MF,
DbgVariable *Var, DbgScope *Scope);
/// collectVariableInfo - Populate DbgScope entries with variables' info.
void collectVariableInfo(const MachineFunction *,
SmallPtrSet<const MDNode *, 16> &ProcessedVars);
/// collectVariableInfoFromMMITable - Collect variable information from
/// side table maintained by MMI.
void collectVariableInfoFromMMITable(const MachineFunction * MF,
SmallPtrSet<const MDNode *, 16> &P);
/// requestLabelBeforeInsn - Ensure that a label will be emitted before MI.
void requestLabelBeforeInsn(const MachineInstr *MI) {
LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol*)0));
}
/// getLabelBeforeInsn - Return Label preceding the instruction.
const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
/// requestLabelAfterInsn - Ensure that a label will be emitted after MI.
void requestLabelAfterInsn(const MachineInstr *MI) {
LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol*)0));
}
/// getLabelAfterInsn - Return Label immediately following the instruction.
const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
public:
//===--------------------------------------------------------------------===//
// Main entry points.
//
DwarfDebug(AsmPrinter *A, Module *M);
~DwarfDebug();
/// beginModule - Emit all Dwarf sections that should come prior to the
/// content.
void beginModule(Module *M);
/// 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(const MachineFunction *MF);
/// endFunction - Gather and emit post-function debug information.
///
void endFunction(const MachineFunction *MF);
/// beginInstruction - Process beginning of an instruction.
void beginInstruction(const MachineInstr *MI);
/// endInstruction - Prcess end of an instruction.
void endInstruction(const MachineInstr *MI);
};
} // End of namespace llvm
#endif