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llvm-mirror/lib/CodeGen/DwarfWriter.cpp
Anton Korobeynikov e6ba8a819c 1. Clean up code due to changes in SwitchTo*Section(2) 
2. Added partial debug support for mingw\cygwin targets (the same as
   Linux\ELF). Please note, that currently mingw\cygwin uses 'stabs' format
   for storing debug info by default, thus many (runtime) libraries has
   this information included. These formats shouldn't be mixed in one binary
   ('stabs' & 'DWARF'), otherwise binutils tools will be confused.

llvm-svn: 31311
2006-10-31 08:31:24 +00:00

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//===-- llvm/CodeGen/DwarfWriter.cpp - Dwarf Framework ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by James M. Laskey and 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.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/UniqueVector.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineDebugInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetFrameInfo.h"
#include <iostream>
#include <string>
using namespace llvm;
using namespace llvm::dwarf;
static cl::opt<bool>
DwarfVerbose("dwarf-verbose", cl::Hidden,
cl::desc("Add comments to Dwarf directives."));
namespace llvm {
//===----------------------------------------------------------------------===//
/// DWLabel - Labels are used to track locations in the assembler file.
/// Labels appear in the form <prefix>debug_<Tag><Number>, where the tag is a
/// category of label (Ex. location) and number is a value unique in that
/// category.
class DWLabel {
public:
const char *Tag; // Label category tag. Should always be
// a staticly declared C string.
unsigned Number; // Unique number.
DWLabel(const char *T, unsigned N) : Tag(T), Number(N) {}
};
//===----------------------------------------------------------------------===//
/// Forward declarations.
//
class DIE;
//===----------------------------------------------------------------------===//
/// CompileUnit - This dwarf writer support class manages information associate
/// with a source file.
class CompileUnit {
private:
CompileUnitDesc *Desc; // Compile unit debug descriptor.
unsigned ID; // File ID for source.
DIE *Die; // Compile unit debug information entry.
std::map<std::string, DIE *> Globals; // A map of globally visible named
// entities for this unit.
std::map<DebugInfoDesc *, DIE *> DescToDieMap;
// Tracks the mapping of unit level
// debug informaton descriptors to debug
// information entries.
public:
CompileUnit(CompileUnitDesc *CUD, unsigned I, DIE *D)
: Desc(CUD)
, ID(I)
, Die(D)
, Globals()
, DescToDieMap()
{}
~CompileUnit();
// Accessors.
CompileUnitDesc *getDesc() const { return Desc; }
unsigned getID() const { return ID; }
DIE* getDie() const { return Die; }
std::map<std::string, DIE *> &getGlobals() { return Globals; }
/// hasContent - Return true if this compile unit has something to write out.
///
bool hasContent() const;
/// AddGlobal - Add a new global entity to the compile unit.
///
void AddGlobal(const std::string &Name, DIE *Die);
/// getDieMapSlotFor - Returns the debug information entry map slot for the
/// specified debug descriptor.
DIE *&getDieMapSlotFor(DebugInfoDesc *DD) {
return DescToDieMap[DD];
}
};
//===----------------------------------------------------------------------===//
/// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
/// Dwarf abbreviation.
class DIEAbbrevData {
private:
unsigned Attribute; // Dwarf attribute code.
unsigned Form; // Dwarf form code.
public:
DIEAbbrevData(unsigned A, unsigned F)
: Attribute(A)
, Form(F)
{}
// Accessors.
unsigned getAttribute() const { return Attribute; }
unsigned getForm() const { return Form; }
/// Profile - Used to gather unique data for the abbreviation folding set.
///
void Profile(FoldingSetNodeID &ID) {
ID.AddInteger(Attribute);
ID.AddInteger(Form);
}
};
//===----------------------------------------------------------------------===//
/// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
/// information object.
class DIEAbbrev : public FoldingSetNode {
private:
unsigned Number; // Unique number for abbreviation.
unsigned Tag; // Dwarf tag code.
unsigned ChildrenFlag; // Dwarf children flag.
std::vector<DIEAbbrevData> Data; // Raw data bytes for abbreviation.
public:
DIEAbbrev(unsigned T, unsigned C)
: Number(0)
, Tag(T)
, ChildrenFlag(C)
, Data()
{}
~DIEAbbrev() {}
// Accessors.
unsigned getNumber() const { return Number; }
unsigned getTag() const { return Tag; }
unsigned getChildrenFlag() const { return ChildrenFlag; }
const std::vector<DIEAbbrevData> &getData() const { return Data; }
void setNumber(unsigned N) { Number = N; }
void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
/// AddAttribute - Adds another set of attribute information to the
/// abbreviation.
void AddAttribute(unsigned Attribute, unsigned Form) {
Data.push_back(DIEAbbrevData(Attribute, Form));
}
/// AddFirstAttribute - Adds a set of attribute information to the front
/// of the abbreviation.
void AddFirstAttribute(unsigned Attribute, unsigned Form) {
Data.insert(Data.begin(), DIEAbbrevData(Attribute, Form));
}
/// Profile - Used to gather unique data for the abbreviation folding set.
///
void Profile(FoldingSetNodeID &ID) {
ID.AddInteger(Tag);
ID.AddInteger(ChildrenFlag);
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i)
Data[i].Profile(ID);
}
/// Emit - Print the abbreviation using the specified Dwarf writer.
///
void Emit(const Dwarf &DW) const;
#ifndef NDEBUG
void print(std::ostream &O);
void dump();
#endif
};
//===----------------------------------------------------------------------===//
/// DIEValue - A debug information entry value.
//
class DIEValue {
public:
enum {
isInteger,
isString,
isLabel,
isAsIsLabel,
isDelta,
isEntry,
isBlock
};
unsigned Type; // Type of the value
DIEValue(unsigned T) : Type(T) {}
virtual ~DIEValue() {}
// Implement isa/cast/dyncast.
static bool classof(const DIEValue *) { return true; }
/// EmitValue - Emit value via the Dwarf writer.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const = 0;
/// SizeOf - Return the size of a value in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const = 0;
};
//===----------------------------------------------------------------------===//
/// DWInteger - An integer value DIE.
///
class DIEInteger : public DIEValue {
private:
uint64_t Integer;
public:
DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEInteger *) { return true; }
static bool classof(const DIEValue *I) { return I->Type == isInteger; }
/// BestForm - Choose the best form for integer.
///
unsigned BestForm(bool IsSigned);
/// EmitValue - Emit integer of appropriate size.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of integer value in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
/// DIEString - A string value DIE.
///
struct DIEString : public DIEValue {
const std::string String;
DIEString(const std::string &S) : DIEValue(isString), String(S) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEString *) { return true; }
static bool classof(const DIEValue *S) { return S->Type == isString; }
/// EmitValue - Emit string value.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of string value in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
/// DIEDwarfLabel - A Dwarf internal label expression DIE.
//
struct DIEDwarfLabel : public DIEValue {
const DWLabel Label;
DIEDwarfLabel(const DWLabel &L) : DIEValue(isLabel), Label(L) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEDwarfLabel *) { return true; }
static bool classof(const DIEValue *L) { return L->Type == isLabel; }
/// EmitValue - Emit label value.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of label value in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
/// DIEObjectLabel - A label to an object in code or data.
//
struct DIEObjectLabel : public DIEValue {
const std::string Label;
DIEObjectLabel(const std::string &L) : DIEValue(isAsIsLabel), Label(L) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEObjectLabel *) { return true; }
static bool classof(const DIEValue *L) { return L->Type == isAsIsLabel; }
/// EmitValue - Emit label value.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of label value in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
/// DIEDelta - A simple label difference DIE.
///
struct DIEDelta : public DIEValue {
const DWLabel LabelHi;
const DWLabel LabelLo;
DIEDelta(const DWLabel &Hi, const DWLabel &Lo)
: DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEDelta *) { return true; }
static bool classof(const DIEValue *D) { return D->Type == isDelta; }
/// EmitValue - Emit delta value.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of delta value in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
/// DIEntry - A pointer to a debug information entry.
///
struct DIEntry : public DIEValue {
DIE *Entry;
DIEntry(DIE *E) : DIEValue(isEntry), Entry(E) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEntry *) { return true; }
static bool classof(const DIEValue *E) { return E->Type == isEntry; }
/// EmitValue - Emit debug information entry offset.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of debug information entry in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
/// DIEBlock - A block of values. Primarily used for location expressions.
//
struct DIEBlock : public DIEValue {
unsigned Size; // Size in bytes excluding size header.
std::vector<unsigned> Forms; // Data forms.
std::vector<DIEValue *> Values; // Block values.
DIEBlock()
: DIEValue(isBlock)
, Size(0)
, Forms()
, Values()
{}
~DIEBlock();
// Implement isa/cast/dyncast.
static bool classof(const DIEBlock *) { return true; }
static bool classof(const DIEValue *E) { return E->Type == isBlock; }
/// ComputeSize - calculate the size of the block.
///
unsigned ComputeSize(Dwarf &DW);
/// BestForm - Choose the best form for data.
///
unsigned BestForm();
/// EmitValue - Emit block data.
///
virtual void EmitValue(const Dwarf &DW, unsigned Form) const;
/// SizeOf - Determine size of block data in bytes.
///
virtual unsigned SizeOf(const Dwarf &DW, unsigned Form) const;
/// AddUInt - Add an unsigned integer value.
///
void AddUInt(unsigned Form, uint64_t Integer);
/// AddSInt - Add an signed integer value.
///
void AddSInt(unsigned Form, int64_t Integer);
/// AddString - Add a std::string value.
///
void AddString(unsigned Form, const std::string &String);
/// AddLabel - Add a Dwarf label value.
///
void AddLabel(unsigned Form, const DWLabel &Label);
/// AddObjectLabel - Add a non-Dwarf label value.
///
void AddObjectLabel(unsigned Form, const std::string &Label);
/// AddDelta - Add a label delta value.
///
void AddDelta(unsigned Form, const DWLabel &Hi, const DWLabel &Lo);
/// AddDIEntry - Add a DIE value.
///
void AddDIEntry(unsigned Form, DIE *Entry);
};
//===----------------------------------------------------------------------===//
/// DIE - A structured debug information entry. Has an abbreviation which
/// describes it's organization.
class DIE {
private:
DIEAbbrev Abbrev; // Buffer for constructing abbreviation.
unsigned Offset; // Offset in debug info section.
unsigned Size; // Size of instance + children.
std::vector<DIE *> Children; // Children DIEs.
std::vector<DIEValue *> Values; // Attributes values.
public:
DIE(unsigned Tag);
~DIE();
// Accessors.
unsigned getAbbrevNumber() const {
return Abbrev.getNumber();
}
unsigned getOffset() const { return Offset; }
unsigned getSize() const { return Size; }
const std::vector<DIE *> &getChildren() const { return Children; }
const std::vector<DIEValue *> &getValues() const { return Values; }
void setOffset(unsigned O) { Offset = O; }
void setSize(unsigned S) { Size = S; }
/// SiblingOffset - Return the offset of the debug information entry's
/// sibling.
unsigned SiblingOffset() const { return Offset + Size; }
/// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
///
void AddSiblingOffset();
/// AddUInt - Add an unsigned integer attribute data and value.
///
void AddUInt(unsigned Attribute, unsigned Form, uint64_t Integer);
/// AddSInt - Add an signed integer attribute data and value.
///
void AddSInt(unsigned Attribute, unsigned Form, int64_t Integer);
/// AddString - Add a std::string attribute data and value.
///
void AddString(unsigned Attribute, unsigned Form,
const std::string &String);
/// AddLabel - Add a Dwarf label attribute data and value.
///
void AddLabel(unsigned Attribute, unsigned Form, const DWLabel &Label);
/// AddObjectLabel - Add a non-Dwarf label attribute data and value.
///
void AddObjectLabel(unsigned Attribute, unsigned Form,
const std::string &Label);
/// AddDelta - Add a label delta attribute data and value.
///
void AddDelta(unsigned Attribute, unsigned Form,
const DWLabel &Hi, const DWLabel &Lo);
/// AddDIEntry - Add a DIE attribute data and value.
///
void AddDIEntry(unsigned Attribute, unsigned Form, DIE *Entry);
/// AddBlock - Add block data.
///
void AddBlock(unsigned Attribute, unsigned Form, DIEBlock *Block);
/// Complete - Indicate that all attributes have been added and
/// ready to get an abbreviation ID.
///
void Complete(Dwarf &DW);
/// AddChild - Add a child to the DIE.
void AddChild(DIE *Child);
};
//===----------------------------------------------------------------------===//
/// Dwarf - Emits Dwarf debug and exception handling directives.
//
class Dwarf {
private:
//===--------------------------------------------------------------------===//
// Core attributes used by the Dwarf writer.
//
//
/// O - Stream to .s file.
///
std::ostream &O;
/// Asm - Target of Dwarf emission.
///
AsmPrinter *Asm;
/// TAI - Target Asm Printer.
const TargetAsmInfo *TAI;
/// TD - Target data.
const TargetData *TD;
/// RI - Register Information.
const MRegisterInfo *RI;
/// M - Current module.
///
Module *M;
/// MF - Current machine function.
///
MachineFunction *MF;
/// DebugInfo - Collected debug information.
///
MachineDebugInfo *DebugInfo;
/// didInitial - Flag to indicate if initial emission has been done.
///
bool didInitial;
/// shouldEmit - Flag to indicate if debug information should be emitted.
///
bool shouldEmit;
/// SubprogramCount - The running count of functions being compiled.
///
unsigned SubprogramCount;
//===--------------------------------------------------------------------===//
// Attributes used to construct specific Dwarf sections.
//
/// CompileUnits - All the compile units involved in this build. The index
/// of each entry in this vector corresponds to the sources in DebugInfo.
std::vector<CompileUnit *> CompileUnits;
/// AbbreviationsSet - Used to uniquely define the abbreviations.
///
FoldingSet<DIEAbbrev> AbbreviationsSet;
/// Abbreviations - A list of all the unique abbreviations in use.
///
std::vector<DIEAbbrev *> Abbreviations;
/// StringPool - A UniqueVector of strings used by indirect references.
/// UnitMap - Map debug information descriptor to compile unit.
///
UniqueVector<std::string> StringPool;
/// UnitMap - Map debug information descriptor to compile unit.
///
std::map<DebugInfoDesc *, CompileUnit *> DescToUnitMap;
/// DescToDieMap - Tracks the mapping of top level debug informaton
/// descriptors to debug information entries.
std::map<DebugInfoDesc *, DIE *> DescToDieMap;
/// SectionMap - Provides a unique id per text section.
///
UniqueVector<std::string> SectionMap;
/// SectionSourceLines - Tracks line numbers per text section.
///
std::vector<std::vector<SourceLineInfo> > SectionSourceLines;
public:
//===--------------------------------------------------------------------===//
// Emission and print routines
//
/// PrintHex - Print a value as a hexidecimal value.
///
void PrintHex(int Value) const;
/// EOL - Print a newline character to asm stream. If a comment is present
/// then it will be printed first. Comments should not contain '\n'.
void EOL(const std::string &Comment) const;
/// EmitAlign - Print a align directive.
///
void EmitAlign(unsigned Alignment) const;
/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
/// unsigned leb128 value.
void EmitULEB128Bytes(unsigned Value) const;
/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
/// signed leb128 value.
void EmitSLEB128Bytes(int Value) const;
/// PrintULEB128 - Print a series of hexidecimal values (separated by
/// commas) representing an unsigned leb128 value.
void PrintULEB128(unsigned Value) const;
/// SizeULEB128 - Compute the number of bytes required for an unsigned
/// leb128 value.
static unsigned SizeULEB128(unsigned Value);
/// PrintSLEB128 - Print a series of hexidecimal values (separated by
/// commas) representing a signed leb128 value.
void PrintSLEB128(int Value) const;
/// SizeSLEB128 - Compute the number of bytes required for a signed leb128
/// value.
static unsigned SizeSLEB128(int Value);
/// EmitInt8 - Emit a byte directive and value.
///
void EmitInt8(int Value) const;
/// EmitInt16 - Emit a short directive and value.
///
void EmitInt16(int Value) const;
/// EmitInt32 - Emit a long directive and value.
///
void EmitInt32(int Value) const;
/// EmitInt64 - Emit a long long directive and value.
///
void EmitInt64(uint64_t Value) const;
/// EmitString - Emit a string with quotes and a null terminator.
/// Special characters are emitted properly.
/// \literal (Eg. '\t') \endliteral
void EmitString(const std::string &String) const;
/// PrintLabelName - Print label name in form used by Dwarf writer.
///
void PrintLabelName(DWLabel Label) const {
PrintLabelName(Label.Tag, Label.Number);
}
void PrintLabelName(const char *Tag, unsigned Number) const;
/// EmitLabel - Emit location label for internal use by Dwarf.
///
void EmitLabel(DWLabel Label) const {
EmitLabel(Label.Tag, Label.Number);
}
void EmitLabel(const char *Tag, unsigned Number) const;
/// EmitReference - Emit a reference to a label.
///
void EmitReference(DWLabel Label) const {
EmitReference(Label.Tag, Label.Number);
}
void EmitReference(const char *Tag, unsigned Number) const;
void EmitReference(const std::string &Name) const;
/// EmitDifference - Emit the difference between two labels. Some
/// assemblers do not behave with absolute expressions with data directives,
/// so there is an option (needsSet) to use an intermediary set expression.
void EmitDifference(DWLabel LabelHi, DWLabel LabelLo) const {
EmitDifference(LabelHi.Tag, LabelHi.Number, LabelLo.Tag, LabelLo.Number);
}
void EmitDifference(const char *TagHi, unsigned NumberHi,
const char *TagLo, unsigned NumberLo) const;
/// AssignAbbrevNumber - Define a unique number for the abbreviation.
///
void AssignAbbrevNumber(DIEAbbrev *Abbrev);
/// NewString - Add a string to the constant pool and returns a label.
///
DWLabel NewString(const std::string &String);
/// getDieMapSlotFor - Returns the debug information entry map slot for the
/// specified debug descriptor.
DIE *&getDieMapSlotFor(DebugInfoDesc *DD);
private:
/// AddSourceLine - Add location information to specified debug information
/// entry.
void AddSourceLine(DIE *Die, CompileUnitDesc *File, unsigned Line);
/// AddAddress - Add an address attribute to a die based on the location
/// provided.
void AddAddress(DIE *Die, unsigned Attribute,
const MachineLocation &Location);
/// NewType - Create a new type DIE.
///
DIE *NewType(DIE *Context, TypeDesc *TyDesc, CompileUnit *Unit);
/// NewCompileUnit - Create new compile unit and it's die.
///
CompileUnit *NewCompileUnit(CompileUnitDesc *UnitDesc, unsigned ID);
/// FindCompileUnit - Get the compile unit for the given descriptor.
///
CompileUnit *FindCompileUnit(CompileUnitDesc *UnitDesc);
/// NewGlobalVariable - Make a new global variable DIE.
///
DIE *NewGlobalVariable(GlobalVariableDesc *GVD);
/// NewSubprogram - Add a new subprogram DIE.
///
DIE *NewSubprogram(SubprogramDesc *SPD);
/// NewScopeVariable - Create a new scope variable.
///
DIE *NewScopeVariable(DebugVariable *DV, CompileUnit *Unit);
/// ConstructScope - Construct the components of a scope.
///
void ConstructScope(DebugScope *ParentScope, DIE *ParentDie,
CompileUnit *Unit);
/// ConstructRootScope - Construct the scope for the subprogram.
///
void ConstructRootScope(DebugScope *RootScope);
/// EmitInitial - Emit initial Dwarf declarations.
///
void EmitInitial();
/// EmitDIE - Recusively Emits a debug information entry.
///
void EmitDIE(DIE *Die) const;
/// SizeAndOffsetDie - Compute the size and offset of a DIE.
///
unsigned SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last);
/// SizeAndOffsets - Compute the size and offset of all the DIEs.
///
void SizeAndOffsets();
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.
void EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
std::vector<MachineMove *> &Moves);
/// EmitDebugInfo - Emit the debug info section.
///
void EmitDebugInfo() const;
/// EmitAbbreviations - Emit the abbreviation section.
///
void EmitAbbreviations() const;
/// EmitDebugLines - Emit source line information.
///
void EmitDebugLines() const;
/// EmitInitialDebugFrame - Emit common frame info into a debug frame section.
///
void EmitInitialDebugFrame();
/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void EmitFunctionDebugFrame();
/// EmitDebugPubNames - Emit info into a debug pubnames section.
///
void EmitDebugPubNames();
/// EmitDebugStr - Emit info into a debug str section.
///
void EmitDebugStr();
/// EmitDebugLoc - Emit info into a debug loc section.
///
void EmitDebugLoc();
/// EmitDebugARanges - Emit info into a debug aranges section.
///
void EmitDebugARanges();
/// EmitDebugRanges - Emit info into a debug ranges section.
///
void EmitDebugRanges();
/// EmitDebugMacInfo - Emit info into a debug macinfo section.
///
void EmitDebugMacInfo();
/// ConstructCompileUnitDIEs - Create a compile unit DIE for each source and
/// header file.
void ConstructCompileUnitDIEs();
/// ConstructGlobalDIEs - Create DIEs for each of the externally visible
/// global variables.
void ConstructGlobalDIEs();
/// ConstructSubprogramDIEs - Create DIEs for each of the externally visible
/// subprograms.
void ConstructSubprogramDIEs();
/// ShouldEmitDwarf - Returns true if Dwarf declarations should be made.
///
bool ShouldEmitDwarf() const { return shouldEmit; }
public:
Dwarf(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T);
virtual ~Dwarf();
// Accessors.
//
const TargetAsmInfo *getTargetAsmInfo() const { return TAI; }
/// SetDebugInfo - Set DebugInfo when it's known that pass manager has
/// created it. Set by the target AsmPrinter.
void SetDebugInfo(MachineDebugInfo *DI);
//===--------------------------------------------------------------------===//
// Main entry points.
//
/// 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(MachineFunction *MF);
/// EndFunction - Gather and emit post-function debug information.
///
void EndFunction();
};
} // End of namespace llvm
//===----------------------------------------------------------------------===//
CompileUnit::~CompileUnit() {
delete Die;
}
/// hasContent - Return true if this compile unit has something to write out.
///
bool CompileUnit::hasContent() const {
return !Die->getChildren().empty();
}
/// AddGlobal - Add a new global entity to the compile unit.
///
void CompileUnit::AddGlobal(const std::string &Name, DIE *Die) {
Globals[Name] = Die;
}
//===----------------------------------------------------------------------===//
/// Emit - Print the abbreviation using the specified Dwarf writer.
///
void DIEAbbrev::Emit(const Dwarf &DW) const {
// Emit its Dwarf tag type.
DW.EmitULEB128Bytes(Tag);
DW.EOL(TagString(Tag));
// Emit whether it has children DIEs.
DW.EmitULEB128Bytes(ChildrenFlag);
DW.EOL(ChildrenString(ChildrenFlag));
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
const DIEAbbrevData &AttrData = Data[i];
// Emit attribute type.
DW.EmitULEB128Bytes(AttrData.getAttribute());
DW.EOL(AttributeString(AttrData.getAttribute()));
// Emit form type.
DW.EmitULEB128Bytes(AttrData.getForm());
DW.EOL(FormEncodingString(AttrData.getForm()));
}
// Mark end of abbreviation.
DW.EmitULEB128Bytes(0); DW.EOL("EOM(1)");
DW.EmitULEB128Bytes(0); DW.EOL("EOM(2)");
}
#ifndef NDEBUG
void DIEAbbrev::print(std::ostream &O) {
O << "Abbreviation @"
<< std::hex << (intptr_t)this << std::dec
<< " "
<< TagString(Tag)
<< " "
<< ChildrenString(ChildrenFlag)
<< "\n";
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
O << " "
<< AttributeString(Data[i].getAttribute())
<< " "
<< FormEncodingString(Data[i].getForm())
<< "\n";
}
}
void DIEAbbrev::dump() { print(std::cerr); }
#endif
//===----------------------------------------------------------------------===//
/// BestForm - Choose the best form for integer.
///
unsigned DIEInteger::BestForm(bool IsSigned) {
if (IsSigned) {
if ((char)Integer == (signed)Integer) return DW_FORM_data1;
if ((short)Integer == (signed)Integer) return DW_FORM_data2;
if ((int)Integer == (signed)Integer) return DW_FORM_data4;
} else {
if ((unsigned char)Integer == Integer) return DW_FORM_data1;
if ((unsigned short)Integer == Integer) return DW_FORM_data2;
if ((unsigned int)Integer == Integer) return DW_FORM_data4;
}
return DW_FORM_data8;
}
/// EmitValue - Emit integer of appropriate size.
///
void DIEInteger::EmitValue(const Dwarf &DW, unsigned Form) const {
switch (Form) {
case DW_FORM_flag: // Fall thru
case DW_FORM_ref1: // Fall thru
case DW_FORM_data1: DW.EmitInt8(Integer); break;
case DW_FORM_ref2: // Fall thru
case DW_FORM_data2: DW.EmitInt16(Integer); break;
case DW_FORM_ref4: // Fall thru
case DW_FORM_data4: DW.EmitInt32(Integer); break;
case DW_FORM_ref8: // Fall thru
case DW_FORM_data8: DW.EmitInt64(Integer); break;
case DW_FORM_udata: DW.EmitULEB128Bytes(Integer); break;
case DW_FORM_sdata: DW.EmitSLEB128Bytes(Integer); break;
default: assert(0 && "DIE Value form not supported yet"); break;
}
}
/// SizeOf - Determine size of integer value in bytes.
///
unsigned DIEInteger::SizeOf(const Dwarf &DW, unsigned Form) const {
switch (Form) {
case DW_FORM_flag: // Fall thru
case DW_FORM_ref1: // Fall thru
case DW_FORM_data1: return sizeof(int8_t);
case DW_FORM_ref2: // Fall thru
case DW_FORM_data2: return sizeof(int16_t);
case DW_FORM_ref4: // Fall thru
case DW_FORM_data4: return sizeof(int32_t);
case DW_FORM_ref8: // Fall thru
case DW_FORM_data8: return sizeof(int64_t);
case DW_FORM_udata: return DW.SizeULEB128(Integer);
case DW_FORM_sdata: return DW.SizeSLEB128(Integer);
default: assert(0 && "DIE Value form not supported yet"); break;
}
return 0;
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit string value.
///
void DIEString::EmitValue(const Dwarf &DW, unsigned Form) const {
DW.EmitString(String);
}
/// SizeOf - Determine size of string value in bytes.
///
unsigned DIEString::SizeOf(const Dwarf &DW, unsigned Form) const {
return String.size() + sizeof(char); // sizeof('\0');
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIEDwarfLabel::EmitValue(const Dwarf &DW, unsigned Form) const {
DW.EmitReference(Label);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEDwarfLabel::SizeOf(const Dwarf &DW, unsigned Form) const {
return DW.getTargetAsmInfo()->getAddressSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIEObjectLabel::EmitValue(const Dwarf &DW, unsigned Form) const {
DW.EmitReference(Label);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEObjectLabel::SizeOf(const Dwarf &DW, unsigned Form) const {
return DW.getTargetAsmInfo()->getAddressSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit delta value.
///
void DIEDelta::EmitValue(const Dwarf &DW, unsigned Form) const {
DW.EmitDifference(LabelHi, LabelLo);
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEDelta::SizeOf(const Dwarf &DW, unsigned Form) const {
return DW.getTargetAsmInfo()->getAddressSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit debug information entry offset.
///
void DIEntry::EmitValue(const Dwarf &DW, unsigned Form) const {
DW.EmitInt32(Entry->getOffset());
}
/// SizeOf - Determine size of debug information entry value in bytes.
///
unsigned DIEntry::SizeOf(const Dwarf &DW, unsigned Form) const {
return sizeof(int32_t);
}
//===----------------------------------------------------------------------===//
DIEBlock::~DIEBlock() {
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
delete Values[i];
}
}
/// ComputeSize - calculate the size of the block.
///
unsigned DIEBlock::ComputeSize(Dwarf &DW) {
Size = 0;
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
Size += Values[i]->SizeOf(DW, Forms[i]);
}
return Size;
}
/// BestForm - Choose the best form for data.
///
unsigned DIEBlock::BestForm() {
if ((unsigned char)Size == Size) return DW_FORM_block1;
if ((unsigned short)Size == Size) return DW_FORM_block2;
if ((unsigned int)Size == Size) return DW_FORM_block4;
return DW_FORM_block;
}
/// EmitValue - Emit block data.
///
void DIEBlock::EmitValue(const Dwarf &DW, unsigned Form) const {
switch (Form) {
case DW_FORM_block1: DW.EmitInt8(Size); break;
case DW_FORM_block2: DW.EmitInt16(Size); break;
case DW_FORM_block4: DW.EmitInt32(Size); break;
case DW_FORM_block: DW.EmitULEB128Bytes(Size); break;
default: assert(0 && "Improper form for block"); break;
}
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
DW.EOL("");
Values[i]->EmitValue(DW, Forms[i]);
}
}
/// SizeOf - Determine size of block data in bytes.
///
unsigned DIEBlock::SizeOf(const Dwarf &DW, unsigned Form) const {
switch (Form) {
case DW_FORM_block1: return Size + sizeof(int8_t);
case DW_FORM_block2: return Size + sizeof(int16_t);
case DW_FORM_block4: return Size + sizeof(int32_t);
case DW_FORM_block: return Size + DW.SizeULEB128(Size);
default: assert(0 && "Improper form for block"); break;
}
return 0;
}
/// AddUInt - Add an unsigned integer value.
///
void DIEBlock::AddUInt(unsigned Form, uint64_t Integer) {
DIEInteger *DI = new DIEInteger(Integer);
Values.push_back(DI);
if (Form == 0) Form = DI->BestForm(false);
Forms.push_back(Form);
}
/// AddSInt - Add an signed integer value.
///
void DIEBlock::AddSInt(unsigned Form, int64_t Integer) {
DIEInteger *DI = new DIEInteger(Integer);
Values.push_back(DI);
if (Form == 0) Form = DI->BestForm(true);
Forms.push_back(Form);
}
/// AddString - Add a std::string value.
///
void DIEBlock::AddString(unsigned Form, const std::string &String) {
Values.push_back(new DIEString(String));
Forms.push_back(Form);
}
/// AddLabel - Add a Dwarf label value.
///
void DIEBlock::AddLabel(unsigned Form, const DWLabel &Label) {
Values.push_back(new DIEDwarfLabel(Label));
Forms.push_back(Form);
}
/// AddObjectLabel - Add a non-Dwarf label value.
///
void DIEBlock::AddObjectLabel(unsigned Form, const std::string &Label) {
Values.push_back(new DIEObjectLabel(Label));
Forms.push_back(Form);
}
/// AddDelta - Add a label delta value.
///
void DIEBlock::AddDelta(unsigned Form, const DWLabel &Hi, const DWLabel &Lo) {
Values.push_back(new DIEDelta(Hi, Lo));
Forms.push_back(Form);
}
/// AddDIEntry - Add a DIE value.
///
void DIEBlock::AddDIEntry(unsigned Form, DIE *Entry) {
Values.push_back(new DIEntry(Entry));
Forms.push_back(Form);
}
//===----------------------------------------------------------------------===//
DIE::DIE(unsigned Tag)
: Abbrev(Tag, DW_CHILDREN_no)
, Offset(0)
, Size(0)
, Children()
, Values()
{}
DIE::~DIE() {
for (unsigned i = 0, N = Children.size(); i < N; ++i) {
delete Children[i];
}
for (unsigned j = 0, M = Values.size(); j < M; ++j) {
delete Values[j];
}
}
/// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
///
void DIE::AddSiblingOffset() {
DIEInteger *DI = new DIEInteger(0);
Values.insert(Values.begin(), DI);
Abbrev.AddFirstAttribute(DW_AT_sibling, DW_FORM_ref4);
}
/// AddUInt - Add an unsigned integer attribute data and value.
///
void DIE::AddUInt(unsigned Attribute, unsigned Form, uint64_t Integer) {
DIEInteger *DI = new DIEInteger(Integer);
Values.push_back(DI);
if (!Form) Form = DI->BestForm(false);
Abbrev.AddAttribute(Attribute, Form);
}
/// AddSInt - Add an signed integer attribute data and value.
///
void DIE::AddSInt(unsigned Attribute, unsigned Form, int64_t Integer) {
DIEInteger *DI = new DIEInteger(Integer);
Values.push_back(DI);
if (!Form) Form = DI->BestForm(true);
Abbrev.AddAttribute(Attribute, Form);
}
/// AddString - Add a std::string attribute data and value.
///
void DIE::AddString(unsigned Attribute, unsigned Form,
const std::string &String) {
Values.push_back(new DIEString(String));
Abbrev.AddAttribute(Attribute, Form);
}
/// AddLabel - Add a Dwarf label attribute data and value.
///
void DIE::AddLabel(unsigned Attribute, unsigned Form,
const DWLabel &Label) {
Values.push_back(new DIEDwarfLabel(Label));
Abbrev.AddAttribute(Attribute, Form);
}
/// AddObjectLabel - Add an non-Dwarf label attribute data and value.
///
void DIE::AddObjectLabel(unsigned Attribute, unsigned Form,
const std::string &Label) {
Values.push_back(new DIEObjectLabel(Label));
Abbrev.AddAttribute(Attribute, Form);
}
/// AddDelta - Add a label delta attribute data and value.
///
void DIE::AddDelta(unsigned Attribute, unsigned Form,
const DWLabel &Hi, const DWLabel &Lo) {
Values.push_back(new DIEDelta(Hi, Lo));
Abbrev.AddAttribute(Attribute, Form);
}
/// AddDIEntry - Add a DIE attribute data and value.
///
void DIE::AddDIEntry(unsigned Attribute, unsigned Form, DIE *Entry) {
Values.push_back(new DIEntry(Entry));
Abbrev.AddAttribute(Attribute, Form);
}
/// AddBlock - Add block data.
///
void DIE::AddBlock(unsigned Attribute, unsigned Form, DIEBlock *Block) {
assert(Block->Size && "Block size has not been computed");
Values.push_back(Block);
if (!Form) Form = Block->BestForm();
Abbrev.AddAttribute(Attribute, Form);
}
/// Complete - Indicate that all attributes have been added and ready to get an
/// abbreviation ID.
void DIE::Complete(Dwarf &DW) {
DW.AssignAbbrevNumber(&Abbrev);
}
/// AddChild - Add a child to the DIE.
///
void DIE::AddChild(DIE *Child) {
Abbrev.setChildrenFlag(DW_CHILDREN_yes);
Children.push_back(Child);
}
//===----------------------------------------------------------------------===//
/// Dwarf
//===----------------------------------------------------------------------===//
/// PrintHex - Print a value as a hexidecimal value.
///
void Dwarf::PrintHex(int Value) const {
O << "0x" << std::hex << Value << std::dec;
}
/// EOL - Print a newline character to asm stream. If a comment is present
/// then it will be printed first. Comments should not contain '\n'.
void Dwarf::EOL(const std::string &Comment) const {
if (DwarfVerbose && !Comment.empty()) {
O << "\t"
<< TAI->getCommentString()
<< " "
<< Comment;
}
O << "\n";
}
/// EmitAlign - Print a align directive.
///
void Dwarf::EmitAlign(unsigned Alignment) const {
O << TAI->getAlignDirective() << Alignment << "\n";
}
/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
/// unsigned leb128 value.
void Dwarf::EmitULEB128Bytes(unsigned Value) const {
if (TAI->hasLEB128()) {
O << "\t.uleb128\t"
<< Value;
} else {
O << TAI->getData8bitsDirective();
PrintULEB128(Value);
}
}
/// EmitSLEB128Bytes - Emit an assembler byte data directive to compose a
/// signed leb128 value.
void Dwarf::EmitSLEB128Bytes(int Value) const {
if (TAI->hasLEB128()) {
O << "\t.sleb128\t"
<< Value;
} else {
O << TAI->getData8bitsDirective();
PrintSLEB128(Value);
}
}
/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
/// representing an unsigned leb128 value.
void Dwarf::PrintULEB128(unsigned Value) const {
do {
unsigned Byte = Value & 0x7f;
Value >>= 7;
if (Value) Byte |= 0x80;
PrintHex(Byte);
if (Value) O << ", ";
} while (Value);
}
/// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
/// value.
unsigned Dwarf::SizeULEB128(unsigned Value) {
unsigned Size = 0;
do {
Value >>= 7;
Size += sizeof(int8_t);
} while (Value);
return Size;
}
/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
/// representing a signed leb128 value.
void Dwarf::PrintSLEB128(int Value) const {
int Sign = Value >> (8 * sizeof(Value) - 1);
bool IsMore;
do {
unsigned Byte = Value & 0x7f;
Value >>= 7;
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
if (IsMore) Byte |= 0x80;
PrintHex(Byte);
if (IsMore) O << ", ";
} while (IsMore);
}
/// SizeSLEB128 - Compute the number of bytes required for a signed leb128
/// value.
unsigned Dwarf::SizeSLEB128(int Value) {
unsigned Size = 0;
int Sign = Value >> (8 * sizeof(Value) - 1);
bool IsMore;
do {
unsigned Byte = Value & 0x7f;
Value >>= 7;
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
Size += sizeof(int8_t);
} while (IsMore);
return Size;
}
/// EmitInt8 - Emit a byte directive and value.
///
void Dwarf::EmitInt8(int Value) const {
O << TAI->getData8bitsDirective();
PrintHex(Value & 0xFF);
}
/// EmitInt16 - Emit a short directive and value.
///
void Dwarf::EmitInt16(int Value) const {
O << TAI->getData16bitsDirective();
PrintHex(Value & 0xFFFF);
}
/// EmitInt32 - Emit a long directive and value.
///
void Dwarf::EmitInt32(int Value) const {
O << TAI->getData32bitsDirective();
PrintHex(Value);
}
/// EmitInt64 - Emit a long long directive and value.
///
void Dwarf::EmitInt64(uint64_t Value) const {
if (TAI->getData64bitsDirective()) {
O << TAI->getData64bitsDirective() << "0x" << std::hex << Value << std::dec;
} else {
if (TD->isBigEndian()) {
EmitInt32(unsigned(Value >> 32)); O << "\n";
EmitInt32(unsigned(Value));
} else {
EmitInt32(unsigned(Value)); O << "\n";
EmitInt32(unsigned(Value >> 32));
}
}
}
/// EmitString - Emit a string with quotes and a null terminator.
/// Special characters are emitted properly. (Eg. '\t')
void Dwarf::EmitString(const std::string &String) const {
O << TAI->getAsciiDirective()
<< "\"";
for (unsigned i = 0, N = String.size(); i < N; ++i) {
unsigned char C = String[i];
if (!isascii(C) || iscntrl(C)) {
switch(C) {
case '\b': O << "\\b"; break;
case '\f': O << "\\f"; break;
case '\n': O << "\\n"; break;
case '\r': O << "\\r"; break;
case '\t': O << "\\t"; break;
default:
O << '\\';
O << char('0' + ((C >> 6) & 7));
O << char('0' + ((C >> 3) & 7));
O << char('0' + ((C >> 0) & 7));
break;
}
} else if (C == '\"') {
O << "\\\"";
} else if (C == '\'') {
O << "\\\'";
} else {
O << C;
}
}
O << "\\0\"";
}
/// PrintLabelName - Print label name in form used by Dwarf writer.
///
void Dwarf::PrintLabelName(const char *Tag, unsigned Number) const {
O << TAI->getPrivateGlobalPrefix()
<< "debug_"
<< Tag;
if (Number) O << Number;
}
/// EmitLabel - Emit location label for internal use by Dwarf.
///
void Dwarf::EmitLabel(const char *Tag, unsigned Number) const {
PrintLabelName(Tag, Number);
O << ":\n";
}
/// EmitReference - Emit a reference to a label.
///
void Dwarf::EmitReference(const char *Tag, unsigned Number) const {
if (TAI->getAddressSize() == 4)
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
PrintLabelName(Tag, Number);
}
void Dwarf::EmitReference(const std::string &Name) const {
if (TAI->getAddressSize() == 4)
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
O << Name;
}
/// EmitDifference - Emit an label difference as sizeof(pointer) value. Some
/// assemblers do not accept absolute expressions with data directives, so there
/// is an option (needsSet) to use an intermediary 'set' expression.
void Dwarf::EmitDifference(const char *TagHi, unsigned NumberHi,
const char *TagLo, unsigned NumberLo) const {
if (TAI->needsSet()) {
static unsigned SetCounter = 0;
O << "\t.set\t";
PrintLabelName("set", SetCounter);
O << ",";
PrintLabelName(TagHi, NumberHi);
O << "-";
PrintLabelName(TagLo, NumberLo);
O << "\n";
if (TAI->getAddressSize() == sizeof(int32_t))
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
PrintLabelName("set", SetCounter);
++SetCounter;
} else {
if (TAI->getAddressSize() == sizeof(int32_t))
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
PrintLabelName(TagHi, NumberHi);
O << "-";
PrintLabelName(TagLo, NumberLo);
}
}
/// AssignAbbrevNumber - Define a unique number for the abbreviation.
///
void Dwarf::AssignAbbrevNumber(DIEAbbrev *Abbrev) {
// Profile the node so that we can make it unique.
FoldingSetNodeID ID;
Abbrev->Profile(ID);
// Check the set for priors.
DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(Abbrev);
// If it's newly added.
if (InSet == Abbrev) {
// Add to abbreviation list.
Abbreviations.push_back(Abbrev);
// Assign the vector position + 1 as its number.
Abbrev->setNumber(Abbreviations.size());
} else {
// Assign existing abbreviation number.
Abbrev->setNumber(InSet->getNumber());
}
}
/// NewString - Add a string to the constant pool and returns a label.
///
DWLabel Dwarf::NewString(const std::string &String) {
unsigned StringID = StringPool.insert(String);
return DWLabel("string", StringID);
}
/// AddSourceLine - Add location information to specified debug information
/// entry.
void Dwarf::AddSourceLine(DIE *Die, CompileUnitDesc *File, unsigned Line){
if (File && Line) {
CompileUnit *FileUnit = FindCompileUnit(File);
unsigned FileID = FileUnit->getID();
Die->AddUInt(DW_AT_decl_file, 0, FileID);
Die->AddUInt(DW_AT_decl_line, 0, Line);
}
}
/// AddAddress - Add an address attribute to a die based on the location
/// provided.
void Dwarf::AddAddress(DIE *Die, unsigned Attribute,
const MachineLocation &Location) {
DIEBlock *Block = new DIEBlock();
unsigned Reg = RI->getDwarfRegNum(Location.getRegister());
if (Location.isRegister()) {
if (Reg < 32) {
Block->AddUInt(DW_FORM_data1, DW_OP_reg0 + Reg);
} else {
Block->AddUInt(DW_FORM_data1, DW_OP_regx);
Block->AddUInt(DW_FORM_udata, Reg);
}
} else {
if (Reg < 32) {
Block->AddUInt(DW_FORM_data1, DW_OP_breg0 + Reg);
} else {
Block->AddUInt(DW_FORM_data1, DW_OP_bregx);
Block->AddUInt(DW_FORM_udata, Reg);
}
Block->AddUInt(DW_FORM_sdata, Location.getOffset());
}
Block->ComputeSize(*this);
Die->AddBlock(Attribute, 0, Block);
}
/// getDieMapSlotFor - Returns the debug information entry map slot for the
/// specified debug descriptor.
DIE *&Dwarf::getDieMapSlotFor(DebugInfoDesc *DD) {
return DescToDieMap[DD];
}
/// NewType - Create a new type DIE.
///
DIE *Dwarf::NewType(DIE *Context, TypeDesc *TyDesc, CompileUnit *Unit) {
if (!TyDesc) {
// FIXME - Hack for missing types
DIE *Die = new DIE(DW_TAG_base_type);
Die->AddUInt(DW_AT_byte_size, 0, 4);
Die->AddUInt(DW_AT_encoding, DW_FORM_data1, DW_ATE_signed);
Unit->getDie()->AddChild(Die);
return Die;
}
// Check for pre-existence.
DIE *&Slot = Unit->getDieMapSlotFor(TyDesc);
if (Slot) return Slot;
// Type DIE result.
DIE *Ty = NULL;
// FIXME - Not sure why programs and variables are coming through here.
// Short cut for handling subprogram types (not really a TyDesc.)
if (SubprogramDesc *SubprogramTy = dyn_cast<SubprogramDesc>(TyDesc)) {
Slot = Ty = new DIE(DW_TAG_pointer_type);
Ty->AddUInt(DW_AT_byte_size, 0, TAI->getAddressSize());
Ty->AddString(DW_AT_name, DW_FORM_string, SubprogramTy->getName());
Context->AddChild(Ty);
return Slot;
}
// Short cut for handling global variable types (not really a TyDesc.)
if (GlobalVariableDesc *GlobalVariableTy =
dyn_cast<GlobalVariableDesc>(TyDesc)) {
Slot = Ty = new DIE(DW_TAG_pointer_type);
Ty->AddUInt(DW_AT_byte_size, 0, TAI->getAddressSize());
Ty->AddString(DW_AT_name, DW_FORM_string, GlobalVariableTy->getName());
Context->AddChild(Ty);
return Slot;
}
// Get core information.
const std::string &Name = TyDesc->getName();
uint64_t Size = TyDesc->getSize() >> 3;
if (BasicTypeDesc *BasicTy = dyn_cast<BasicTypeDesc>(TyDesc)) {
// Fundamental types like int, float, bool
Slot = Ty = new DIE(DW_TAG_base_type);
unsigned Encoding = BasicTy->getEncoding();
Ty->AddUInt(DW_AT_encoding, DW_FORM_data1, Encoding);
} else if (DerivedTypeDesc *DerivedTy = dyn_cast<DerivedTypeDesc>(TyDesc)) {
// Create specific DIE.
Slot = Ty = new DIE(DerivedTy->getTag());
// Map to main type, void will not have a type.
if (TypeDesc *FromTy = DerivedTy->getFromType()) {
Ty->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, FromTy, Unit));
}
} else if (CompositeTypeDesc *CompTy = dyn_cast<CompositeTypeDesc>(TyDesc)) {
// Fetch tag
unsigned Tag = CompTy->getTag();
// Create specific DIE.
Slot = Ty = Tag == DW_TAG_vector_type ? new DIE(DW_TAG_array_type) :
new DIE(Tag);
std::vector<DebugInfoDesc *> &Elements = CompTy->getElements();
switch (Tag) {
case DW_TAG_vector_type: Ty->AddUInt(DW_AT_GNU_vector, DW_FORM_flag, 1);
// Fall thru
case DW_TAG_array_type: {
// Add element type.
if (TypeDesc *FromTy = CompTy->getFromType()) {
Ty->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, FromTy, Unit));
}
// Don't emit size attribute.
Size = 0;
// Construct an anonymous type for index type.
DIE *IndexTy = new DIE(DW_TAG_base_type);
IndexTy->AddUInt(DW_AT_byte_size, 0, 4);
IndexTy->AddUInt(DW_AT_encoding, DW_FORM_data1, DW_ATE_signed);
// Add to context.
Context->AddChild(IndexTy);
// Add subranges to array type.
for(unsigned i = 0, N = Elements.size(); i < N; ++i) {
SubrangeDesc *SRD = cast<SubrangeDesc>(Elements[i]);
int64_t Lo = SRD->getLo();
int64_t Hi = SRD->getHi();
DIE *Subrange = new DIE(DW_TAG_subrange_type);
// If a range is available.
if (Lo != Hi) {
Subrange->AddDIEntry(DW_AT_type, DW_FORM_ref4, IndexTy);
// Only add low if non-zero.
if (Lo) Subrange->AddSInt(DW_AT_lower_bound, 0, Lo);
Subrange->AddSInt(DW_AT_upper_bound, 0, Hi);
}
Ty->AddChild(Subrange);
}
break;
}
case DW_TAG_structure_type:
case DW_TAG_union_type: {
// Add elements to structure type.
for(unsigned i = 0, N = Elements.size(); i < N; ++i) {
DebugInfoDesc *Element = Elements[i];
if (DerivedTypeDesc *MemberDesc = dyn_cast<DerivedTypeDesc>(Element)) {
// Add field or base class.
unsigned Tag = MemberDesc->getTag();
// Extract the basic information.
const std::string &Name = MemberDesc->getName();
TypeDesc *MemTy = MemberDesc->getFromType();
uint64_t Size = MemberDesc->getSize();
uint64_t Align = MemberDesc->getAlign();
uint64_t Offset = MemberDesc->getOffset();
// Construct member debug information entry.
DIE *Member = new DIE(Tag);
// Add name if not "".
if (!Name.empty())Member->AddString(DW_AT_name, DW_FORM_string, Name);
// Add location if available.
AddSourceLine(Member, MemberDesc->getFile(), MemberDesc->getLine());
// Most of the time the field info is the same as the members.
uint64_t FieldSize = Size;
uint64_t FieldAlign = Align;
uint64_t FieldOffset = Offset;
if (TypeDesc *FromTy = MemberDesc->getFromType()) {
Member->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, FromTy, Unit));
FieldSize = FromTy->getSize();
FieldAlign = FromTy->getSize();
}
// Unless we have a bit field.
if (Tag == DW_TAG_member && FieldSize != Size) {
// Construct the alignment mask.
uint64_t AlignMask = ~(FieldAlign - 1);
// Determine the high bit + 1 of the declared size.
uint64_t HiMark = (Offset + FieldSize) & AlignMask;
// Work backwards to determine the base offset of the field.
FieldOffset = HiMark - FieldSize;
// Now normalize offset to the field.
Offset -= FieldOffset;
// Maybe we need to work from the other end.
if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
// Add size and offset.
Member->AddUInt(DW_AT_byte_size, 0, FieldSize >> 3);
Member->AddUInt(DW_AT_bit_size, 0, Size);
Member->AddUInt(DW_AT_bit_offset, 0, Offset);
}
// Add computation for offset.
DIEBlock *Block = new DIEBlock();
Block->AddUInt(DW_FORM_data1, DW_OP_plus_uconst);
Block->AddUInt(DW_FORM_udata, FieldOffset >> 3);
Block->ComputeSize(*this);
Member->AddBlock(DW_AT_data_member_location, 0, Block);
// Add accessibility (public default unless is base class.
if (MemberDesc->isProtected()) {
Member->AddUInt(DW_AT_accessibility, 0, DW_ACCESS_protected);
} else if (MemberDesc->isPrivate()) {
Member->AddUInt(DW_AT_accessibility, 0, DW_ACCESS_private);
} else if (Tag == DW_TAG_inheritance) {
Member->AddUInt(DW_AT_accessibility, 0, DW_ACCESS_public);
}
Ty->AddChild(Member);
} else if (GlobalVariableDesc *StaticDesc =
dyn_cast<GlobalVariableDesc>(Element)) {
// Add static member.
// Construct member debug information entry.
DIE *Static = new DIE(DW_TAG_variable);
// Add name and mangled name.
const std::string &Name = StaticDesc->getDisplayName();
const std::string &MangledName = StaticDesc->getName();
Static->AddString(DW_AT_name, DW_FORM_string, Name);
Static->AddString(DW_AT_MIPS_linkage_name, DW_FORM_string,
MangledName);
// Add location.
AddSourceLine(Static, StaticDesc->getFile(), StaticDesc->getLine());
// Add type.
if (TypeDesc *StaticTy = StaticDesc->getType()) {
Static->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, StaticTy, Unit));
}
// Add flags.
Static->AddUInt(DW_AT_external, DW_FORM_flag, 1);
Static->AddUInt(DW_AT_declaration, DW_FORM_flag, 1);
Ty->AddChild(Static);
} else if (SubprogramDesc *MethodDesc =
dyn_cast<SubprogramDesc>(Element)) {
// Add member function.
// Construct member debug information entry.
DIE *Method = new DIE(DW_TAG_subprogram);
// Add name and mangled name.
const std::string &Name = MethodDesc->getDisplayName();
const std::string &MangledName = MethodDesc->getName();
bool IsCTor = false;
if (Name.empty()) {
Method->AddString(DW_AT_name, DW_FORM_string, MangledName);
IsCTor = TyDesc->getName() == MangledName;
} else {
Method->AddString(DW_AT_name, DW_FORM_string, Name);
Method->AddString(DW_AT_MIPS_linkage_name, DW_FORM_string,
MangledName);
}
// Add location.
AddSourceLine(Method, MethodDesc->getFile(), MethodDesc->getLine());
// Add type.
if (CompositeTypeDesc *MethodTy =
dyn_cast_or_null<CompositeTypeDesc>(MethodDesc->getType())) {
// Get argument information.
std::vector<DebugInfoDesc *> &Args = MethodTy->getElements();
// If not a ctor.
if (!IsCTor) {
// Add return type.
Method->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, dyn_cast<TypeDesc>(Args[0]),
Unit));
}
// Add arguments.
for(unsigned i = 1, N = Args.size(); i < N; ++i) {
DIE *Arg = new DIE(DW_TAG_formal_parameter);
Arg->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, cast<TypeDesc>(Args[i]), Unit));
Arg->AddUInt(DW_AT_artificial, DW_FORM_flag, 1);
Method->AddChild(Arg);
}
}
// Add flags.
Method->AddUInt(DW_AT_external, DW_FORM_flag, 1);
Method->AddUInt(DW_AT_declaration, DW_FORM_flag, 1);
Ty->AddChild(Method);
}
}
break;
}
case DW_TAG_enumeration_type: {
// Add enumerators to enumeration type.
for(unsigned i = 0, N = Elements.size(); i < N; ++i) {
EnumeratorDesc *ED = cast<EnumeratorDesc>(Elements[i]);
const std::string &Name = ED->getName();
int64_t Value = ED->getValue();
DIE *Enumerator = new DIE(DW_TAG_enumerator);
Enumerator->AddString(DW_AT_name, DW_FORM_string, Name);
Enumerator->AddSInt(DW_AT_const_value, DW_FORM_sdata, Value);
Ty->AddChild(Enumerator);
}
break;
}
case DW_TAG_subroutine_type: {
// Add prototype flag.
Ty->AddUInt(DW_AT_prototyped, DW_FORM_flag, 1);
// Add return type.
Ty->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, dyn_cast<TypeDesc>(Elements[0]), Unit));
// Add arguments.
for(unsigned i = 1, N = Elements.size(); i < N; ++i) {
DIE *Arg = new DIE(DW_TAG_formal_parameter);
Arg->AddDIEntry(DW_AT_type, DW_FORM_ref4,
NewType(Context, cast<TypeDesc>(Elements[i]), Unit));
Ty->AddChild(Arg);
}
break;
}
default: break;
}
}
assert(Ty && "Type not supported yet");
// Add size if non-zero (derived types don't have a size.)
if (Size) Ty->AddUInt(DW_AT_byte_size, 0, Size);
// Add name if not anonymous or intermediate type.
if (!Name.empty()) Ty->AddString(DW_AT_name, DW_FORM_string, Name);
// Add source line info if available.
AddSourceLine(Ty, TyDesc->getFile(), TyDesc->getLine());
// Add to context owner.
Context->AddChild(Ty);
return Slot;
}
/// NewCompileUnit - Create new compile unit and it's debug information entry.
///
CompileUnit *Dwarf::NewCompileUnit(CompileUnitDesc *UnitDesc,
unsigned ID) {
// Construct debug information entry.
DIE *Die = new DIE(DW_TAG_compile_unit);
Die->AddDelta (DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0),
DWLabel("section_line", 0));
// Die->AddLabel (DW_AT_high_pc, DW_FORM_addr, DWLabel("text_end", 0));
// Die->AddLabel (DW_AT_low_pc, DW_FORM_addr, DWLabel("text_begin", 0));
Die->AddString(DW_AT_producer, DW_FORM_string, UnitDesc->getProducer());
Die->AddUInt (DW_AT_language, DW_FORM_data1, UnitDesc->getLanguage());
Die->AddString(DW_AT_name, DW_FORM_string, UnitDesc->getFileName());
Die->AddString(DW_AT_comp_dir, DW_FORM_string, UnitDesc->getDirectory());
// Add debug information entry to descriptor map.
DIE *&Slot = getDieMapSlotFor(UnitDesc);
Slot = Die;
// Construct compile unit.
CompileUnit *Unit = new CompileUnit(UnitDesc, ID, Die);
// Add Unit to compile unit map.
DescToUnitMap[UnitDesc] = Unit;
return Unit;
}
/// FindCompileUnit - Get the compile unit for the given descriptor.
///
CompileUnit *Dwarf::FindCompileUnit(CompileUnitDesc *UnitDesc) {
CompileUnit *Unit = DescToUnitMap[UnitDesc];
assert(Unit && "Missing compile unit.");
return Unit;
}
/// NewGlobalVariable - Add a new global variable DIE.
///
DIE *Dwarf::NewGlobalVariable(GlobalVariableDesc *GVD) {
// Get the compile unit context.
CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(GVD->getContext());
CompileUnit *Unit = FindCompileUnit(UnitDesc);
// Check for pre-existence.
DIE *&Slot = Unit->getDieMapSlotFor(GVD);
if (Slot) return Slot;
// Get the global variable itself.
GlobalVariable *GV = GVD->getGlobalVariable();
const std::string &Name = GVD->hasMangledName() ? GVD->getDisplayName()
: GVD->getName();
const std::string &MangledName = GVD->hasMangledName() ? GVD->getName()
: "";
// Get the global's type.
DIE *Type = NewType(Unit->getDie(), GVD->getType(), Unit);
// Create the globale variable DIE.
DIE *VariableDie = new DIE(DW_TAG_variable);
VariableDie->AddString(DW_AT_name, DW_FORM_string, Name);
if (!MangledName.empty()) {
VariableDie->AddString(DW_AT_MIPS_linkage_name, DW_FORM_string,
MangledName);
}
VariableDie->AddDIEntry(DW_AT_type, DW_FORM_ref4, Type);
VariableDie->AddUInt(DW_AT_external, DW_FORM_flag, 1);
// Add source line info if available.
AddSourceLine(VariableDie, UnitDesc, GVD->getLine());
// Work up linkage name.
const std::string LinkageName = Asm->getGlobalLinkName(GV);
// Add address.
DIEBlock *Block = new DIEBlock();
Block->AddUInt(DW_FORM_data1, DW_OP_addr);
Block->AddObjectLabel(DW_FORM_udata, LinkageName);
Block->ComputeSize(*this);
VariableDie->AddBlock(DW_AT_location, 0, Block);
// Add to map.
Slot = VariableDie;
// Add to context owner.
Unit->getDie()->AddChild(VariableDie);
// Expose as global.
// FIXME - need to check external flag.
Unit->AddGlobal(Name, VariableDie);
return VariableDie;
}
/// NewSubprogram - Add a new subprogram DIE.
///
DIE *Dwarf::NewSubprogram(SubprogramDesc *SPD) {
// Get the compile unit context.
CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(SPD->getContext());
CompileUnit *Unit = FindCompileUnit(UnitDesc);
// Check for pre-existence.
DIE *&Slot = Unit->getDieMapSlotFor(SPD);
if (Slot) return Slot;
// Gather the details (simplify add attribute code.)
const std::string &Name = SPD->hasMangledName() ? SPD->getDisplayName()
: SPD->getName();
const std::string &MangledName = SPD->hasMangledName() ? SPD->getName()
: "";
DIE *Type = NewType(Unit->getDie(), SPD->getType(), Unit);
unsigned IsExternal = SPD->isStatic() ? 0 : 1;
DIE *SubprogramDie = new DIE(DW_TAG_subprogram);
SubprogramDie->AddString(DW_AT_name, DW_FORM_string, Name);
if (!MangledName.empty()) {
SubprogramDie->AddString(DW_AT_MIPS_linkage_name, DW_FORM_string,
MangledName);
}
if (Type) {
SubprogramDie->AddDIEntry(DW_AT_type, DW_FORM_ref4, Type);
}
SubprogramDie->AddUInt(DW_AT_external, DW_FORM_flag, IsExternal);
SubprogramDie->AddUInt(DW_AT_prototyped, DW_FORM_flag, 1);
// Add source line info if available.
AddSourceLine(SubprogramDie, UnitDesc, SPD->getLine());
// Add to map.
Slot = SubprogramDie;
// Add to context owner.
Unit->getDie()->AddChild(SubprogramDie);
// Expose as global.
Unit->AddGlobal(Name, SubprogramDie);
return SubprogramDie;
}
/// NewScopeVariable - Create a new scope variable.
///
DIE *Dwarf::NewScopeVariable(DebugVariable *DV, CompileUnit *Unit) {
// Get the descriptor.
VariableDesc *VD = DV->getDesc();
// Translate tag to proper Dwarf tag. The result variable is dropped for now.
unsigned Tag;
switch (VD->getTag()) {
case DW_TAG_return_variable: return NULL;
case DW_TAG_arg_variable: Tag = DW_TAG_formal_parameter; break;
case DW_TAG_auto_variable: // fall thru
default: Tag = DW_TAG_variable; break;
}
// Define variable debug information entry.
DIE *VariableDie = new DIE(Tag);
VariableDie->AddString(DW_AT_name, DW_FORM_string, VD->getName());
// Add source line info if available.
AddSourceLine(VariableDie, VD->getFile(), VD->getLine());
// Add variable type.
DIE *Type = NewType(Unit->getDie(), VD->getType(), Unit);
VariableDie->AddDIEntry(DW_AT_type, DW_FORM_ref4, Type);
// Add variable address.
MachineLocation Location;
RI->getLocation(*MF, DV->getFrameIndex(), Location);
AddAddress(VariableDie, DW_AT_location, Location);
return VariableDie;
}
/// ConstructScope - Construct the components of a scope.
///
void Dwarf::ConstructScope(DebugScope *ParentScope,
DIE *ParentDie, CompileUnit *Unit) {
// Add variables to scope.
std::vector<DebugVariable *> &Variables = ParentScope->getVariables();
for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
DIE *VariableDie = NewScopeVariable(Variables[i], Unit);
if (VariableDie) ParentDie->AddChild(VariableDie);
}
// Add nested scopes.
std::vector<DebugScope *> &Scopes = ParentScope->getScopes();
for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
// Define the Scope debug information entry.
DebugScope *Scope = Scopes[j];
// FIXME - Ignore inlined functions for the time being.
if (!Scope->getParent()) continue;
unsigned StartID = Scope->getStartLabelID();
unsigned EndID = Scope->getEndLabelID();
// Throw out scope if block is discarded.
if (StartID && !DebugInfo->isLabelValid(StartID)) continue;
if (EndID && !DebugInfo->isLabelValid(EndID)) continue;
DIE *ScopeDie = new DIE(DW_TAG_lexical_block);
// Add the scope bounds.
if (StartID) {
ScopeDie->AddLabel(DW_AT_low_pc, DW_FORM_addr,
DWLabel("loc", StartID));
} else {
ScopeDie->AddLabel(DW_AT_low_pc, DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
}
if (EndID) {
ScopeDie->AddLabel(DW_AT_high_pc, DW_FORM_addr,
DWLabel("loc", EndID));
} else {
ScopeDie->AddLabel(DW_AT_high_pc, DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
}
// Add the scope contents.
ConstructScope(Scope, ScopeDie, Unit);
ParentDie->AddChild(ScopeDie);
}
}
/// ConstructRootScope - Construct the scope for the subprogram.
///
void Dwarf::ConstructRootScope(DebugScope *RootScope) {
// Exit if there is no root scope.
if (!RootScope) return;
// Get the subprogram debug information entry.
SubprogramDesc *SPD = cast<SubprogramDesc>(RootScope->getDesc());
// Get the compile unit context.
CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(SPD->getContext());
CompileUnit *Unit = FindCompileUnit(UnitDesc);
// Get the subprogram die.
DIE *SPDie = Unit->getDieMapSlotFor(SPD);
assert(SPDie && "Missing subprogram descriptor");
// Add the function bounds.
SPDie->AddLabel(DW_AT_low_pc, DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
SPDie->AddLabel(DW_AT_high_pc, DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
MachineLocation Location(RI->getFrameRegister(*MF));
AddAddress(SPDie, DW_AT_frame_base, Location);
ConstructScope(RootScope, SPDie, Unit);
}
/// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
/// tools to recognize the object file contains Dwarf information.
///
void Dwarf::EmitInitial() {
// Check to see if we already emitted intial headers.
if (didInitial) return;
didInitial = true;
// Dwarf sections base addresses.
if (TAI->getDwarfRequiresFrameSection()) {
Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
EmitLabel("section_frame", 0);
}
Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
EmitLabel("section_info", 0);
Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
EmitLabel("section_abbrev", 0);
Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
EmitLabel("section_aranges", 0);
Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
EmitLabel("section_macinfo", 0);
Asm->SwitchToDataSection(TAI->getDwarfLineSection());
EmitLabel("section_line", 0);
Asm->SwitchToDataSection(TAI->getDwarfLocSection());
EmitLabel("section_loc", 0);
Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
EmitLabel("section_pubnames", 0);
Asm->SwitchToDataSection(TAI->getDwarfStrSection());
EmitLabel("section_str", 0);
Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
EmitLabel("section_ranges", 0);
Asm->SwitchToTextSection(TAI->getTextSection());
EmitLabel("text_begin", 0);
Asm->SwitchToDataSection(TAI->getDataSection());
EmitLabel("data_begin", 0);
// Emit common frame information.
EmitInitialDebugFrame();
}
/// EmitDIE - Recusively Emits a debug information entry.
///
void Dwarf::EmitDIE(DIE *Die) const {
// Get the abbreviation for this DIE.
unsigned AbbrevNumber = Die->getAbbrevNumber();
const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
O << "\n";
// Emit the code (index) for the abbreviation.
EmitULEB128Bytes(AbbrevNumber);
EOL(std::string("Abbrev [" +
utostr(AbbrevNumber) +
"] 0x" + utohexstr(Die->getOffset()) +
":0x" + utohexstr(Die->getSize()) + " " +
TagString(Abbrev->getTag())));
const std::vector<DIEValue *> &Values = Die->getValues();
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev->getData();
// Emit the DIE attribute values.
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
unsigned Attr = AbbrevData[i].getAttribute();
unsigned Form = AbbrevData[i].getForm();
assert(Form && "Too many attributes for DIE (check abbreviation)");
switch (Attr) {
case DW_AT_sibling: {
EmitInt32(Die->SiblingOffset());
break;
}
default: {
// Emit an attribute using the defined form.
Values[i]->EmitValue(*this, Form);
break;
}
}
EOL(AttributeString(Attr));
}
// Emit the DIE children if any.
if (Abbrev->getChildrenFlag() == DW_CHILDREN_yes) {
const std::vector<DIE *> &Children = Die->getChildren();
for (unsigned j = 0, M = Children.size(); j < M; ++j) {
EmitDIE(Children[j]);
}
EmitInt8(0); EOL("End Of Children Mark");
}
}
/// SizeAndOffsetDie - Compute the size and offset of a DIE.
///
unsigned Dwarf::SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
// Get the children.
const std::vector<DIE *> &Children = Die->getChildren();
// If not last sibling and has children then add sibling offset attribute.
if (!Last && !Children.empty()) Die->AddSiblingOffset();
// Record the abbreviation.
Die->Complete(*this);
// Get the abbreviation for this DIE.
unsigned AbbrevNumber = Die->getAbbrevNumber();
const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
// Set DIE offset
Die->setOffset(Offset);
// Start the size with the size of abbreviation code.
Offset += SizeULEB128(AbbrevNumber);
const std::vector<DIEValue *> &Values = Die->getValues();
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev->getData();
// Emit the DIE attribute values.
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
// Size attribute value.
Offset += Values[i]->SizeOf(*this, AbbrevData[i].getForm());
}
// Emit the DIE children if any.
if (!Children.empty()) {
assert(Abbrev->getChildrenFlag() == DW_CHILDREN_yes &&
"Children flag not set");
for (unsigned j = 0, M = Children.size(); j < M; ++j) {
Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
}
// End of children marker.
Offset += sizeof(int8_t);
}
Die->setSize(Offset - Die->getOffset());
return Offset;
}
/// SizeAndOffsets - Compute the size and offset of all the DIEs.
///
void Dwarf::SizeAndOffsets() {
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
// Compute size of compile unit header
unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
sizeof(int16_t) + // DWARF version number
sizeof(int32_t) + // Offset Into Abbrev. Section
sizeof(int8_t); // Pointer Size (in bytes)
SizeAndOffsetDie(Unit->getDie(), Offset, (i + 1) == N);
}
}
}
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.
void Dwarf::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
std::vector<MachineMove *> &Moves) {
for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
MachineMove *Move = Moves[i];
unsigned LabelID = Move->getLabelID();
// Throw out move if the label is invalid.
if (LabelID && !DebugInfo->isLabelValid(LabelID)) continue;
const MachineLocation &Dst = Move->getDestination();
const MachineLocation &Src = Move->getSource();
// Advance row if new location.
if (BaseLabel && LabelID && BaseLabelID != LabelID) {
EmitInt8(DW_CFA_advance_loc4);
EOL("DW_CFA_advance_loc4");
EmitDifference("loc", LabelID, BaseLabel, BaseLabelID);
EOL("");
BaseLabelID = LabelID;
BaseLabel = "loc";
}
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TAI->getAddressSize() : -TAI->getAddressSize();
// If advancing cfa.
if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
if (!Src.isRegister()) {
if (Src.getRegister() == MachineLocation::VirtualFP) {
EmitInt8(DW_CFA_def_cfa_offset);
EOL("DW_CFA_def_cfa_offset");
} else {
EmitInt8(DW_CFA_def_cfa);
EOL("DW_CFA_def_cfa");
EmitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister()));
EOL("Register");
}
int Offset = Src.getOffset() / stackGrowth;
EmitULEB128Bytes(Offset);
EOL("Offset");
} else {
assert(0 && "Machine move no supported yet.");
}
} else {
unsigned Reg = RI->getDwarfRegNum(Src.getRegister());
int Offset = Dst.getOffset() / stackGrowth;
if (Offset < 0) {
EmitInt8(DW_CFA_offset_extended_sf);
EOL("DW_CFA_offset_extended_sf");
EmitULEB128Bytes(Reg);
EOL("Reg");
EmitSLEB128Bytes(Offset);
EOL("Offset");
} else if (Reg < 64) {
EmitInt8(DW_CFA_offset + Reg);
EOL("DW_CFA_offset + Reg");
EmitULEB128Bytes(Offset);
EOL("Offset");
} else {
EmitInt8(DW_CFA_offset_extended);
EOL("DW_CFA_offset_extended");
EmitULEB128Bytes(Reg);
EOL("Reg");
EmitULEB128Bytes(Offset);
EOL("Offset");
}
}
}
}
/// EmitDebugInfo - Emit the debug info section.
///
void Dwarf::EmitDebugInfo() const {
// Start debug info section.
Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
DIE *Die = Unit->getDie();
// Emit the compile units header.
EmitLabel("info_begin", Unit->getID());
// Emit size of content not including length itself
unsigned ContentSize = Die->getSize() +
sizeof(int16_t) + // DWARF version number
sizeof(int32_t) + // Offset Into Abbrev. Section
sizeof(int8_t); // Pointer Size (in bytes)
EmitInt32(ContentSize); EOL("Length of Compilation Unit Info");
EmitInt16(DWARF_VERSION); EOL("DWARF version number");
EmitDifference("abbrev_begin", 0, "section_abbrev", 0);
EOL("Offset Into Abbrev. Section");
EmitInt8(TAI->getAddressSize()); EOL("Address Size (in bytes)");
EmitDIE(Die);
EmitLabel("info_end", Unit->getID());
}
O << "\n";
}
}
/// EmitAbbreviations - Emit the abbreviation section.
///
void Dwarf::EmitAbbreviations() const {
// Check to see if it is worth the effort.
if (!Abbreviations.empty()) {
// Start the debug abbrev section.
Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
EmitLabel("abbrev_begin", 0);
// For each abbrevation.
for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
// Get abbreviation data
const DIEAbbrev *Abbrev = Abbreviations[i];
// Emit the abbrevations code (base 1 index.)
EmitULEB128Bytes(Abbrev->getNumber()); EOL("Abbreviation Code");
// Emit the abbreviations data.
Abbrev->Emit(*this);
O << "\n";
}
EmitLabel("abbrev_end", 0);
O << "\n";
}
}
/// EmitDebugLines - Emit source line information.
///
void Dwarf::EmitDebugLines() const {
// Minimum line delta, thus ranging from -10..(255-10).
const int MinLineDelta = -(DW_LNS_fixed_advance_pc + 1);
// Maximum line delta, thus ranging from -10..(255-10).
const int MaxLineDelta = 255 + MinLineDelta;
// Start the dwarf line section.
Asm->SwitchToDataSection(TAI->getDwarfLineSection());
// Construct the section header.
EmitDifference("line_end", 0, "line_begin", 0);
EOL("Length of Source Line Info");
EmitLabel("line_begin", 0);
EmitInt16(DWARF_VERSION); EOL("DWARF version number");
EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0);
EOL("Prolog Length");
EmitLabel("line_prolog_begin", 0);
EmitInt8(1); EOL("Minimum Instruction Length");
EmitInt8(1); EOL("Default is_stmt_start flag");
EmitInt8(MinLineDelta); EOL("Line Base Value (Special Opcodes)");
EmitInt8(MaxLineDelta); EOL("Line Range Value (Special Opcodes)");
EmitInt8(-MinLineDelta); EOL("Special Opcode Base");
// Line number standard opcode encodings argument count
EmitInt8(0); EOL("DW_LNS_copy arg count");
EmitInt8(1); EOL("DW_LNS_advance_pc arg count");
EmitInt8(1); EOL("DW_LNS_advance_line arg count");
EmitInt8(1); EOL("DW_LNS_set_file arg count");
EmitInt8(1); EOL("DW_LNS_set_column arg count");
EmitInt8(0); EOL("DW_LNS_negate_stmt arg count");
EmitInt8(0); EOL("DW_LNS_set_basic_block arg count");
EmitInt8(0); EOL("DW_LNS_const_add_pc arg count");
EmitInt8(1); EOL("DW_LNS_fixed_advance_pc arg count");
const UniqueVector<std::string> &Directories = DebugInfo->getDirectories();
const UniqueVector<SourceFileInfo> &SourceFiles = DebugInfo->getSourceFiles();
// Emit directories.
for (unsigned DirectoryID = 1, NDID = Directories.size();
DirectoryID <= NDID; ++DirectoryID) {
EmitString(Directories[DirectoryID]); EOL("Directory");
}
EmitInt8(0); EOL("End of directories");
// Emit files.
for (unsigned SourceID = 1, NSID = SourceFiles.size();
SourceID <= NSID; ++SourceID) {
const SourceFileInfo &SourceFile = SourceFiles[SourceID];
EmitString(SourceFile.getName()); EOL("Source");
EmitULEB128Bytes(SourceFile.getDirectoryID()); EOL("Directory #");
EmitULEB128Bytes(0); EOL("Mod date");
EmitULEB128Bytes(0); EOL("File size");
}
EmitInt8(0); EOL("End of files");
EmitLabel("line_prolog_end", 0);
// A sequence for each text section.
for (unsigned j = 0, M = SectionSourceLines.size(); j < M; ++j) {
// Isolate current sections line info.
const std::vector<SourceLineInfo> &LineInfos = SectionSourceLines[j];
if (DwarfVerbose) {
O << "\t"
<< TAI->getCommentString() << " "
<< "Section "
<< SectionMap[j + 1].c_str() << "\n";
}
// Dwarf assumes we start with first line of first source file.
unsigned Source = 1;
unsigned Line = 1;
// Construct rows of the address, source, line, column matrix.
for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
const SourceLineInfo &LineInfo = LineInfos[i];
unsigned LabelID = LineInfo.getLabelID();
// Source line labels are validated at the MachineDebugInfo level.
if (DwarfVerbose) {
unsigned SourceID = LineInfo.getSourceID();
const SourceFileInfo &SourceFile = SourceFiles[SourceID];
unsigned DirectoryID = SourceFile.getDirectoryID();
O << "\t"
<< TAI->getCommentString() << " "
<< Directories[DirectoryID]
<< SourceFile.getName() << ":"
<< LineInfo.getLine() << "\n";
}
// Define the line address.
EmitInt8(0); EOL("Extended Op");
EmitInt8(4 + 1); EOL("Op size");
EmitInt8(DW_LNE_set_address); EOL("DW_LNE_set_address");
EmitReference("loc", LabelID); EOL("Location label");
// If change of source, then switch to the new source.
if (Source != LineInfo.getSourceID()) {
Source = LineInfo.getSourceID();
EmitInt8(DW_LNS_set_file); EOL("DW_LNS_set_file");
EmitULEB128Bytes(Source); EOL("New Source");
}
// If change of line.
if (Line != LineInfo.getLine()) {
// Determine offset.
int Offset = LineInfo.getLine() - Line;
int Delta = Offset - MinLineDelta;
// Update line.
Line = LineInfo.getLine();
// If delta is small enough and in range...
if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
// ... then use fast opcode.
EmitInt8(Delta - MinLineDelta); EOL("Line Delta");
} else {
// ... otherwise use long hand.
EmitInt8(DW_LNS_advance_line); EOL("DW_LNS_advance_line");
EmitSLEB128Bytes(Offset); EOL("Line Offset");
EmitInt8(DW_LNS_copy); EOL("DW_LNS_copy");
}
} else {
// Copy the previous row (different address or source)
EmitInt8(DW_LNS_copy); EOL("DW_LNS_copy");
}
}
// Define last address of section.
EmitInt8(0); EOL("Extended Op");
EmitInt8(4 + 1); EOL("Op size");
EmitInt8(DW_LNE_set_address); EOL("DW_LNE_set_address");
EmitReference("section_end", j + 1); EOL("Section end label");
// Mark end of matrix.
EmitInt8(0); EOL("DW_LNE_end_sequence");
EmitULEB128Bytes(1); O << "\n";
EmitInt8(1); O << "\n";
}
EmitLabel("line_end", 0);
O << "\n";
}
/// EmitInitialDebugFrame - Emit common frame info into a debug frame section.
///
void Dwarf::EmitInitialDebugFrame() {
if (!TAI->getDwarfRequiresFrameSection())
return;
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TAI->getAddressSize() : -TAI->getAddressSize();
// Start the dwarf frame section.
Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
EmitLabel("frame_common", 0);
EmitDifference("frame_common_end", 0,
"frame_common_begin", 0);
EOL("Length of Common Information Entry");
EmitLabel("frame_common_begin", 0);
EmitInt32(DW_CIE_ID); EOL("CIE Identifier Tag");
EmitInt8(DW_CIE_VERSION); EOL("CIE Version");
EmitString(""); EOL("CIE Augmentation");
EmitULEB128Bytes(1); EOL("CIE Code Alignment Factor");
EmitSLEB128Bytes(stackGrowth); EOL("CIE Data Alignment Factor");
EmitInt8(RI->getDwarfRegNum(RI->getRARegister())); EOL("CIE RA Column");
std::vector<MachineMove *> Moves;
RI->getInitialFrameState(Moves);
EmitFrameMoves(NULL, 0, Moves);
for (unsigned i = 0, N = Moves.size(); i < N; ++i) delete Moves[i];
EmitAlign(2);
EmitLabel("frame_common_end", 0);
O << "\n";
}
/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void Dwarf::EmitFunctionDebugFrame() {
if (!TAI->getDwarfRequiresFrameSection())
return;
// Start the dwarf frame section.
Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
EmitDifference("frame_end", SubprogramCount,
"frame_begin", SubprogramCount);
EOL("Length of Frame Information Entry");
EmitLabel("frame_begin", SubprogramCount);
EmitDifference("frame_common", 0, "section_frame", 0);
EOL("FDE CIE offset");
EmitReference("func_begin", SubprogramCount); EOL("FDE initial location");
EmitDifference("func_end", SubprogramCount,
"func_begin", SubprogramCount);
EOL("FDE address range");
std::vector<MachineMove *> &Moves = DebugInfo->getFrameMoves();
EmitFrameMoves("func_begin", SubprogramCount, Moves);
EmitAlign(2);
EmitLabel("frame_end", SubprogramCount);
O << "\n";
}
/// EmitDebugPubNames - Emit visible names into a debug pubnames section.
///
void Dwarf::EmitDebugPubNames() {
// Start the dwarf pubnames section.
Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
EmitDifference("pubnames_end", Unit->getID(),
"pubnames_begin", Unit->getID());
EOL("Length of Public Names Info");
EmitLabel("pubnames_begin", Unit->getID());
EmitInt16(DWARF_VERSION); EOL("DWARF Version");
EmitDifference("info_begin", Unit->getID(), "section_info", 0);
EOL("Offset of Compilation Unit Info");
EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID());
EOL("Compilation Unit Length");
std::map<std::string, DIE *> &Globals = Unit->getGlobals();
for (std::map<std::string, DIE *>::iterator GI = Globals.begin(),
GE = Globals.end();
GI != GE; ++GI) {
const std::string &Name = GI->first;
DIE * Entity = GI->second;
EmitInt32(Entity->getOffset()); EOL("DIE offset");
EmitString(Name); EOL("External Name");
}
EmitInt32(0); EOL("End Mark");
EmitLabel("pubnames_end", Unit->getID());
O << "\n";
}
}
}
/// EmitDebugStr - Emit visible names into a debug str section.
///
void Dwarf::EmitDebugStr() {
// Check to see if it is worth the effort.
if (!StringPool.empty()) {
// Start the dwarf str section.
Asm->SwitchToDataSection(TAI->getDwarfStrSection());
// For each of strings in the string pool.
for (unsigned StringID = 1, N = StringPool.size();
StringID <= N; ++StringID) {
// Emit a label for reference from debug information entries.
EmitLabel("string", StringID);
// Emit the string itself.
const std::string &String = StringPool[StringID];
EmitString(String); O << "\n";
}
O << "\n";
}
}
/// EmitDebugLoc - Emit visible names into a debug loc section.
///
void Dwarf::EmitDebugLoc() {
// Start the dwarf loc section.
Asm->SwitchToDataSection(TAI->getDwarfLocSection());
O << "\n";
}
/// EmitDebugARanges - Emit visible names into a debug aranges section.
///
void Dwarf::EmitDebugARanges() {
// Start the dwarf aranges section.
Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
// FIXME - Mock up
#if 0
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
// Don't include size of length
EmitInt32(0x1c); EOL("Length of Address Ranges Info");
EmitInt16(DWARF_VERSION); EOL("Dwarf Version");
EmitReference("info_begin", Unit->getID());
EOL("Offset of Compilation Unit Info");
EmitInt8(TAI->getAddressSize()); EOL("Size of Address");
EmitInt8(0); EOL("Size of Segment Descriptor");
EmitInt16(0); EOL("Pad (1)");
EmitInt16(0); EOL("Pad (2)");
// Range 1
EmitReference("text_begin", 0); EOL("Address");
EmitDifference("text_end", 0, "text_begin", 0); EOL("Length");
EmitInt32(0); EOL("EOM (1)");
EmitInt32(0); EOL("EOM (2)");
O << "\n";
}
}
#endif
}
/// EmitDebugRanges - Emit visible names into a debug ranges section.
///
void Dwarf::EmitDebugRanges() {
// Start the dwarf ranges section.
Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
O << "\n";
}
/// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
///
void Dwarf::EmitDebugMacInfo() {
// Start the dwarf macinfo section.
Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
O << "\n";
}
/// ConstructCompileUnitDIEs - Create a compile unit DIE for each source and
/// header file.
void Dwarf::ConstructCompileUnitDIEs() {
const UniqueVector<CompileUnitDesc *> CUW = DebugInfo->getCompileUnits();
for (unsigned i = 1, N = CUW.size(); i <= N; ++i) {
CompileUnit *Unit = NewCompileUnit(CUW[i], i);
CompileUnits.push_back(Unit);
}
}
/// ConstructGlobalDIEs - Create DIEs for each of the externally visible global
/// variables.
void Dwarf::ConstructGlobalDIEs() {
std::vector<GlobalVariableDesc *> GlobalVariables =
DebugInfo->getAnchoredDescriptors<GlobalVariableDesc>(*M);
for (unsigned i = 0, N = GlobalVariables.size(); i < N; ++i) {
GlobalVariableDesc *GVD = GlobalVariables[i];
NewGlobalVariable(GVD);
}
}
/// ConstructSubprogramDIEs - Create DIEs for each of the externally visible
/// subprograms.
void Dwarf::ConstructSubprogramDIEs() {
std::vector<SubprogramDesc *> Subprograms =
DebugInfo->getAnchoredDescriptors<SubprogramDesc>(*M);
for (unsigned i = 0, N = Subprograms.size(); i < N; ++i) {
SubprogramDesc *SPD = Subprograms[i];
NewSubprogram(SPD);
}
}
//===----------------------------------------------------------------------===//
/// Dwarf implemenation.
//
Dwarf::Dwarf(std::ostream &OS, AsmPrinter *A,
const TargetAsmInfo *T)
: O(OS)
, Asm(A)
, TAI(T)
, TD(Asm->TM.getTargetData())
, RI(Asm->TM.getRegisterInfo())
, M(NULL)
, MF(NULL)
, DebugInfo(NULL)
, didInitial(false)
, shouldEmit(false)
, SubprogramCount(0)
, CompileUnits()
, AbbreviationsSet()
, Abbreviations()
, StringPool()
, DescToUnitMap()
, DescToDieMap()
, SectionMap()
, SectionSourceLines()
{
}
Dwarf::~Dwarf() {
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
delete CompileUnits[i];
}
}
/// SetDebugInfo - Set DebugInfo when it's known that pass manager has
/// created it. Set by the target AsmPrinter.
void Dwarf::SetDebugInfo(MachineDebugInfo *DI) {
// Make sure initial declarations are made.
if (!DebugInfo && DI->hasInfo()) {
DebugInfo = DI;
shouldEmit = true;
// Emit initial sections
EmitInitial();
// Create all the compile unit DIEs.
ConstructCompileUnitDIEs();
// Create DIEs for each of the externally visible global variables.
ConstructGlobalDIEs();
// Create DIEs for each of the externally visible subprograms.
ConstructSubprogramDIEs();
// Prime section data.
SectionMap.insert(std::string("\t") + TAI->getTextSection());
}
}
/// BeginModule - Emit all Dwarf sections that should come prior to the content.
///
void Dwarf::BeginModule(Module *M) {
this->M = M;
if (!ShouldEmitDwarf()) return;
EOL("Dwarf Begin Module");
}
/// EndModule - Emit all Dwarf sections that should come after the content.
///
void Dwarf::EndModule() {
if (!ShouldEmitDwarf()) return;
EOL("Dwarf End Module");
// Standard sections final addresses.
Asm->SwitchToTextSection(TAI->getTextSection());
EmitLabel("text_end", 0);
Asm->SwitchToDataSection(TAI->getDataSection());
EmitLabel("data_end", 0);
// End text sections.
for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
Asm->SwitchToTextSection(SectionMap[i].c_str());
EmitLabel("section_end", i);
}
// Compute DIE offsets and sizes.
SizeAndOffsets();
// Emit all the DIEs into a debug info section
EmitDebugInfo();
// Corresponding abbreviations into a abbrev section.
EmitAbbreviations();
// Emit source line correspondence into a debug line section.
EmitDebugLines();
// Emit info into a debug pubnames section.
EmitDebugPubNames();
// Emit info into a debug str section.
EmitDebugStr();
// Emit info into a debug loc section.
EmitDebugLoc();
// Emit info into a debug aranges section.
EmitDebugARanges();
// Emit info into a debug ranges section.
EmitDebugRanges();
// Emit info into a debug macinfo section.
EmitDebugMacInfo();
}
/// BeginFunction - Gather pre-function debug information. Assumes being
/// emitted immediately after the function entry point.
void Dwarf::BeginFunction(MachineFunction *MF) {
this->MF = MF;
if (!ShouldEmitDwarf()) return;
EOL("Dwarf Begin Function");
// Begin accumulating function debug information.
DebugInfo->BeginFunction(MF);
// Assumes in correct section after the entry point.
EmitLabel("func_begin", ++SubprogramCount);
}
/// EndFunction - Gather and emit post-function debug information.
///
void Dwarf::EndFunction() {
if (!ShouldEmitDwarf()) return;
EOL("Dwarf End Function");
// Define end label for subprogram.
EmitLabel("func_end", SubprogramCount);
// Get function line info.
const std::vector<SourceLineInfo> &LineInfos = DebugInfo->getSourceLines();
if (!LineInfos.empty()) {
// Get section line info.
unsigned ID = SectionMap.insert(Asm->CurrentSection);
if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
std::vector<SourceLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
// Append the function info to section info.
SectionLineInfos.insert(SectionLineInfos.end(),
LineInfos.begin(), LineInfos.end());
}
// Construct scopes for subprogram.
ConstructRootScope(DebugInfo->getRootScope());
// Emit function frame information.
EmitFunctionDebugFrame();
// Reset the line numbers for the next function.
DebugInfo->ClearLineInfo();
// Clear function debug information.
DebugInfo->EndFunction();
}
//===----------------------------------------------------------------------===//
/// DwarfWriter Implementation
DwarfWriter::DwarfWriter(std::ostream &OS, AsmPrinter *A,
const TargetAsmInfo *T) {
DW = new Dwarf(OS, A, T);
}
DwarfWriter::~DwarfWriter() {
delete DW;
}
/// SetDebugInfo - Set DebugInfo when it's known that pass manager has
/// created it. Set by the target AsmPrinter.
void DwarfWriter::SetDebugInfo(MachineDebugInfo *DI) {
DW->SetDebugInfo(DI);
}
/// BeginModule - Emit all Dwarf sections that should come prior to the
/// content.
void DwarfWriter::BeginModule(Module *M) {
DW->BeginModule(M);
}
/// EndModule - Emit all Dwarf sections that should come after the content.
///
void DwarfWriter::EndModule() {
DW->EndModule();
}
/// BeginFunction - Gather pre-function debug information. Assumes being
/// emitted immediately after the function entry point.
void DwarfWriter::BeginFunction(MachineFunction *MF) {
DW->BeginFunction(MF);
}
/// EndFunction - Gather and emit post-function debug information.
///
void DwarfWriter::EndFunction() {
DW->EndFunction();
}
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