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llvm-6502/lib/CodeGen/DwarfWriter.cpp
Dan Gohman d57c3884af Move the code that emits the .file directives so that it runs after the 
SourceFiles list is fully filled in so that it sees all of the files.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42506 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-01 22:40:20 +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 info into asm files.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/ADT/DenseMap.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/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Mangler.h"
#include "llvm/System/Path.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <ostream>
#include <string>
using namespace llvm;
using namespace llvm::dwarf;
namespace llvm {
//===----------------------------------------------------------------------===//
/// Configuration values for initial hash set sizes (log2).
///
static const unsigned InitDiesSetSize = 9; // 512
static const unsigned InitAbbreviationsSetSize = 9; // 512
static const unsigned InitValuesSetSize = 9; // 512
//===----------------------------------------------------------------------===//
/// Forward declarations.
///
class DIE;
class DIEValue;
//===----------------------------------------------------------------------===//
/// DWLabel - Labels are used to track locations in the assembler file.
/// Labels appear in the form @verbatim <prefix><Tag><Number> @endverbatim,
/// where the tag is a category of label (Ex. location) and number is a value
/// unique in that category.
class DWLabel {
public:
/// Tag - Label category tag. Should always be a staticly declared C string.
///
const char *Tag;
/// Number - Value to make label unique.
///
unsigned Number;
DWLabel(const char *T, unsigned N) : Tag(T), Number(N) {}
void Profile(FoldingSetNodeID &ID) const {
ID.AddString(std::string(Tag));
ID.AddInteger(Number);
}
#ifndef NDEBUG
void print(std::ostream *O) const {
if (O) print(*O);
}
void print(std::ostream &O) const {
O << "." << Tag;
if (Number) O << Number;
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
/// Dwarf abbreviation.
class DIEAbbrevData {
private:
/// Attribute - Dwarf attribute code.
///
unsigned Attribute;
/// Form - Dwarf form code.
///
unsigned Form;
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)const {
ID.AddInteger(Attribute);
ID.AddInteger(Form);
}
};
//===----------------------------------------------------------------------===//
/// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
/// information object.
class DIEAbbrev : public FoldingSetNode {
private:
/// Tag - Dwarf tag code.
///
unsigned Tag;
/// Unique number for node.
///
unsigned Number;
/// ChildrenFlag - Dwarf children flag.
///
unsigned ChildrenFlag;
/// Data - Raw data bytes for abbreviation.
///
std::vector<DIEAbbrevData> Data;
public:
DIEAbbrev(unsigned T, unsigned C)
: Tag(T)
, ChildrenFlag(C)
, Data()
{}
~DIEAbbrev() {}
// Accessors.
unsigned getTag() const { return Tag; }
unsigned getNumber() const { return Number; }
unsigned getChildrenFlag() const { return ChildrenFlag; }
const std::vector<DIEAbbrevData> &getData() const { return Data; }
void setTag(unsigned T) { Tag = T; }
void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
void setNumber(unsigned N) { Number = N; }
/// 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 DwarfDebug &DD) const;
#ifndef NDEBUG
void print(std::ostream *O) {
if (O) print(*O);
}
void print(std::ostream &O);
void dump();
#endif
};
//===----------------------------------------------------------------------===//
/// DIE - A structured debug information entry. Has an abbreviation which
/// describes it's organization.
class DIE : public FoldingSetNode {
protected:
/// Abbrev - Buffer for constructing abbreviation.
///
DIEAbbrev Abbrev;
/// Offset - Offset in debug info section.
///
unsigned Offset;
/// Size - Size of instance + children.
///
unsigned Size;
/// Children DIEs.
///
std::vector<DIE *> Children;
/// Attributes values.
///
std::vector<DIEValue *> Values;
public:
explicit DIE(unsigned Tag)
: Abbrev(Tag, DW_CHILDREN_no)
, Offset(0)
, Size(0)
, Children()
, Values()
{}
virtual ~DIE();
// Accessors.
DIEAbbrev &getAbbrev() { return Abbrev; }
unsigned getAbbrevNumber() const {
return Abbrev.getNumber();
}
unsigned getTag() const { return Abbrev.getTag(); }
unsigned getOffset() const { return Offset; }
unsigned getSize() const { return Size; }
const std::vector<DIE *> &getChildren() const { return Children; }
std::vector<DIEValue *> &getValues() { return Values; }
void setTag(unsigned Tag) { Abbrev.setTag(Tag); }
void setOffset(unsigned O) { Offset = O; }
void setSize(unsigned S) { Size = S; }
/// AddValue - Add a value and attributes to a DIE.
///
void AddValue(unsigned Attribute, unsigned Form, DIEValue *Value) {
Abbrev.AddAttribute(Attribute, Form);
Values.push_back(Value);
}
/// 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();
/// AddChild - Add a child to the DIE.
///
void AddChild(DIE *Child) {
Abbrev.setChildrenFlag(DW_CHILDREN_yes);
Children.push_back(Child);
}
/// Detach - Detaches objects connected to it after copying.
///
void Detach() {
Children.clear();
}
/// Profile - Used to gather unique data for the value folding set.
///
void Profile(FoldingSetNodeID &ID) ;
#ifndef NDEBUG
void print(std::ostream *O, unsigned IncIndent = 0) {
if (O) print(*O, IncIndent);
}
void print(std::ostream &O, unsigned IncIndent = 0);
void dump();
#endif
};
//===----------------------------------------------------------------------===//
/// DIEValue - A debug information entry value.
///
class DIEValue : public FoldingSetNode {
public:
enum {
isInteger,
isString,
isLabel,
isAsIsLabel,
isDelta,
isEntry,
isBlock
};
/// Type - Type of data stored in the value.
///
unsigned Type;
explicit DIEValue(unsigned T)
: Type(T)
{}
virtual ~DIEValue() {}
// Accessors
unsigned getType() const { return Type; }
// Implement isa/cast/dyncast.
static bool classof(const DIEValue *) { return true; }
/// EmitValue - Emit value via the Dwarf writer.
///
virtual void EmitValue(DwarfDebug &DD, unsigned Form) = 0;
/// SizeOf - Return the size of a value in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const = 0;
/// Profile - Used to gather unique data for the value folding set.
///
virtual void Profile(FoldingSetNodeID &ID) = 0;
#ifndef NDEBUG
void print(std::ostream *O) {
if (O) print(*O);
}
virtual void print(std::ostream &O) = 0;
void dump();
#endif
};
//===----------------------------------------------------------------------===//
/// DWInteger - An integer value DIE.
///
class DIEInteger : public DIEValue {
private:
uint64_t Integer;
public:
explicit 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.
///
static unsigned BestForm(bool IsSigned, uint64_t Integer) {
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.
///
virtual void EmitValue(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of integer value in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
/// Profile - Used to gather unique data for the value folding set.
///
static void Profile(FoldingSetNodeID &ID, unsigned Integer) {
ID.AddInteger(isInteger);
ID.AddInteger(Integer);
}
virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Integer); }
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Int: " << (int64_t)Integer
<< " 0x" << std::hex << Integer << std::dec;
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEString - A string value DIE.
///
class DIEString : public DIEValue {
public:
const std::string String;
explicit 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(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of string value in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const {
return String.size() + sizeof(char); // sizeof('\0');
}
/// Profile - Used to gather unique data for the value folding set.
///
static void Profile(FoldingSetNodeID &ID, const std::string &String) {
ID.AddInteger(isString);
ID.AddString(String);
}
virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, String); }
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Str: \"" << String << "\"";
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEDwarfLabel - A Dwarf internal label expression DIE.
//
class DIEDwarfLabel : public DIEValue {
public:
const DWLabel Label;
explicit 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(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of label value in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
/// Profile - Used to gather unique data for the value folding set.
///
static void Profile(FoldingSetNodeID &ID, const DWLabel &Label) {
ID.AddInteger(isLabel);
Label.Profile(ID);
}
virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label); }
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Lbl: ";
Label.print(O);
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEObjectLabel - A label to an object in code or data.
//
class DIEObjectLabel : public DIEValue {
public:
const std::string Label;
explicit 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(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of label value in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
/// Profile - Used to gather unique data for the value folding set.
///
static void Profile(FoldingSetNodeID &ID, const std::string &Label) {
ID.AddInteger(isAsIsLabel);
ID.AddString(Label);
}
virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label); }
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Obj: " << Label;
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEDelta - A simple label difference DIE.
///
class DIEDelta : public DIEValue {
public:
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(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of delta value in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
/// Profile - Used to gather unique data for the value folding set.
///
static void Profile(FoldingSetNodeID &ID, const DWLabel &LabelHi,
const DWLabel &LabelLo) {
ID.AddInteger(isDelta);
LabelHi.Profile(ID);
LabelLo.Profile(ID);
}
virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, LabelHi, LabelLo); }
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Del: ";
LabelHi.print(O);
O << "-";
LabelLo.print(O);
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEntry - A pointer to another debug information entry. An instance of this
/// class can also be used as a proxy for a debug information entry not yet
/// defined (ie. types.)
class DIEntry : public DIEValue {
public:
DIE *Entry;
explicit 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(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of debug information entry in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const {
return sizeof(int32_t);
}
/// Profile - Used to gather unique data for the value folding set.
///
static void Profile(FoldingSetNodeID &ID, DIE *Entry) {
ID.AddInteger(isEntry);
ID.AddPointer(Entry);
}
virtual void Profile(FoldingSetNodeID &ID) {
ID.AddInteger(isEntry);
if (Entry) {
ID.AddPointer(Entry);
} else {
ID.AddPointer(this);
}
}
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Die: 0x" << std::hex << (intptr_t)Entry << std::dec;
}
#endif
};
//===----------------------------------------------------------------------===//
/// DIEBlock - A block of values. Primarily used for location expressions.
//
class DIEBlock : public DIEValue, public DIE {
public:
unsigned Size; // Size in bytes excluding size header.
DIEBlock()
: DIEValue(isBlock)
, DIE(0)
, Size(0)
{}
~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(DwarfDebug &DD);
/// BestForm - Choose the best form for data.
///
unsigned BestForm() const {
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.
///
virtual void EmitValue(DwarfDebug &DD, unsigned Form);
/// SizeOf - Determine size of block data in bytes.
///
virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
/// Profile - Used to gather unique data for the value folding set.
///
virtual void Profile(FoldingSetNodeID &ID) {
ID.AddInteger(isBlock);
DIE::Profile(ID);
}
#ifndef NDEBUG
virtual void print(std::ostream &O) {
O << "Blk: ";
DIE::print(O, 5);
}
#endif
};
//===----------------------------------------------------------------------===//
/// CompileUnit - This dwarf writer support class manages information associate
/// with a source file.
class CompileUnit {
private:
/// Desc - Compile unit debug descriptor.
///
CompileUnitDesc *Desc;
/// ID - File identifier for source.
///
unsigned ID;
/// Die - Compile unit debug information entry.
///
DIE *Die;
/// DescToDieMap - Tracks the mapping of unit level debug informaton
/// descriptors to debug information entries.
std::map<DebugInfoDesc *, DIE *> DescToDieMap;
/// DescToDIEntryMap - Tracks the mapping of unit level debug informaton
/// descriptors to debug information entries using a DIEntry proxy.
std::map<DebugInfoDesc *, DIEntry *> DescToDIEntryMap;
/// Globals - A map of globally visible named entities for this unit.
///
std::map<std::string, DIE *> Globals;
/// DiesSet - Used to uniquely define dies within the compile unit.
///
FoldingSet<DIE> DiesSet;
/// Dies - List of all dies in the compile unit.
///
std::vector<DIE *> Dies;
public:
CompileUnit(CompileUnitDesc *CUD, unsigned I, DIE *D)
: Desc(CUD)
, ID(I)
, Die(D)
, DescToDieMap()
, DescToDIEntryMap()
, Globals()
, DiesSet(InitDiesSetSize)
, Dies()
{}
~CompileUnit() {
delete Die;
for (unsigned i = 0, N = Dies.size(); i < N; ++i)
delete Dies[i];
}
// 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 {
return !Die->getChildren().empty();
}
/// AddGlobal - Add a new global entity to the compile unit.
///
void AddGlobal(const std::string &Name, DIE *Die) {
Globals[Name] = Die;
}
/// getDieMapSlotFor - Returns the debug information entry map slot for the
/// specified debug descriptor.
DIE *&getDieMapSlotFor(DebugInfoDesc *DID) {
return DescToDieMap[DID];
}
/// getDIEntrySlotFor - Returns the debug information entry proxy slot for the
/// specified debug descriptor.
DIEntry *&getDIEntrySlotFor(DebugInfoDesc *DID) {
return DescToDIEntryMap[DID];
}
/// AddDie - Adds or interns the DIE to the compile unit.
///
DIE *AddDie(DIE &Buffer) {
FoldingSetNodeID ID;
Buffer.Profile(ID);
void *Where;
DIE *Die = DiesSet.FindNodeOrInsertPos(ID, Where);
if (!Die) {
Die = new DIE(Buffer);
DiesSet.InsertNode(Die, Where);
this->Die->AddChild(Die);
Buffer.Detach();
}
return Die;
}
};
//===----------------------------------------------------------------------===//
/// Dwarf - Emits general Dwarf directives.
///
class Dwarf {
protected:
//===--------------------------------------------------------------------===//
// 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;
/// MMI - Collected machine module information.
///
MachineModuleInfo *MMI;
/// SubprogramCount - The running count of functions being compiled.
///
unsigned SubprogramCount;
/// Flavor - A unique string indicating what dwarf producer this is, used to
/// unique labels.
const char * const Flavor;
unsigned SetCounter;
Dwarf(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
const char *flavor)
: O(OS)
, Asm(A)
, TAI(T)
, TD(Asm->TM.getTargetData())
, RI(Asm->TM.getRegisterInfo())
, M(NULL)
, MF(NULL)
, MMI(NULL)
, SubprogramCount(0)
, Flavor(flavor)
, SetCounter(1)
{
}
public:
//===--------------------------------------------------------------------===//
// Accessors.
//
AsmPrinter *getAsm() const { return Asm; }
MachineModuleInfo *getMMI() const { return MMI; }
const TargetAsmInfo *getTargetAsmInfo() const { return TAI; }
const TargetData *getTargetData() const { return TD; }
void PrintRelDirective(bool Force32Bit = false, bool isInSection = false)
const {
if (isInSection && TAI->getDwarfSectionOffsetDirective())
O << TAI->getDwarfSectionOffsetDirective();
else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
}
/// 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 {
O << TAI->getPrivateGlobalPrefix() << Tag;
if (Number) O << Number;
}
void PrintLabelName(const char *Tag, unsigned Number,
const char *Suffix) const {
O << TAI->getPrivateGlobalPrefix() << Tag;
if (Number) O << Number;
O << Suffix;
}
/// 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 {
PrintLabelName(Tag, Number);
O << ":\n";
}
/// EmitReference - Emit a reference to a label.
///
void EmitReference(DWLabel Label, bool IsPCRelative = false,
bool Force32Bit = false) const {
EmitReference(Label.Tag, Label.Number, IsPCRelative, Force32Bit);
}
void EmitReference(const char *Tag, unsigned Number,
bool IsPCRelative = false, bool Force32Bit = false) const {
PrintRelDirective(Force32Bit);
PrintLabelName(Tag, Number);
if (IsPCRelative) O << "-" << TAI->getPCSymbol();
}
void EmitReference(const std::string &Name, bool IsPCRelative = false,
bool Force32Bit = false) const {
PrintRelDirective(Force32Bit);
O << Name;
if (IsPCRelative) O << "-" << TAI->getPCSymbol();
}
/// 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,
bool IsSmall = false) {
EmitDifference(LabelHi.Tag, LabelHi.Number,
LabelLo.Tag, LabelLo.Number,
IsSmall);
}
void EmitDifference(const char *TagHi, unsigned NumberHi,
const char *TagLo, unsigned NumberLo,
bool IsSmall = false) {
if (TAI->needsSet()) {
O << "\t.set\t";
PrintLabelName("set", SetCounter, Flavor);
O << ",";
PrintLabelName(TagHi, NumberHi);
O << "-";
PrintLabelName(TagLo, NumberLo);
O << "\n";
PrintRelDirective(IsSmall);
PrintLabelName("set", SetCounter, Flavor);
++SetCounter;
} else {
PrintRelDirective(IsSmall);
PrintLabelName(TagHi, NumberHi);
O << "-";
PrintLabelName(TagLo, NumberLo);
}
}
void EmitSectionOffset(const char* Label, const char* Section,
unsigned LabelNumber, unsigned SectionNumber,
bool IsSmall = false, bool isEH = false) {
bool printAbsolute = false;
if (TAI->needsSet()) {
O << "\t.set\t";
PrintLabelName("set", SetCounter, Flavor);
O << ",";
PrintLabelName(Label, LabelNumber);
if (isEH)
printAbsolute = TAI->isAbsoluteEHSectionOffsets();
else
printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
if (!printAbsolute) {
O << "-";
PrintLabelName(Section, SectionNumber);
}
O << "\n";
PrintRelDirective(IsSmall);
PrintLabelName("set", SetCounter, Flavor);
++SetCounter;
} else {
PrintRelDirective(IsSmall, true);
PrintLabelName(Label, LabelNumber);
if (isEH)
printAbsolute = TAI->isAbsoluteEHSectionOffsets();
else
printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
if (!printAbsolute) {
O << "-";
PrintLabelName(Section, SectionNumber);
}
}
}
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.
void EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
const std::vector<MachineMove> &Moves) {
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize();
bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
const MachineMove &Move = Moves[i];
unsigned LabelID = Move.getLabelID();
if (LabelID) {
LabelID = MMI->MappedLabel(LabelID);
// Throw out move if the label is invalid.
if (!LabelID) continue;
}
const MachineLocation &Dst = Move.getDestination();
const MachineLocation &Src = Move.getSource();
// Advance row if new location.
if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
Asm->EmitInt8(DW_CFA_advance_loc4);
Asm->EOL("DW_CFA_advance_loc4");
EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
Asm->EOL();
BaseLabelID = LabelID;
BaseLabel = "label";
IsLocal = true;
}
// If advancing cfa.
if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
if (!Src.isRegister()) {
if (Src.getRegister() == MachineLocation::VirtualFP) {
Asm->EmitInt8(DW_CFA_def_cfa_offset);
Asm->EOL("DW_CFA_def_cfa_offset");
} else {
Asm->EmitInt8(DW_CFA_def_cfa);
Asm->EOL("DW_CFA_def_cfa");
Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister()));
Asm->EOL("Register");
}
int Offset = -Src.getOffset();
Asm->EmitULEB128Bytes(Offset);
Asm->EOL("Offset");
} else {
assert(0 && "Machine move no supported yet.");
}
} else if (Src.isRegister() &&
Src.getRegister() == MachineLocation::VirtualFP) {
if (Dst.isRegister()) {
Asm->EmitInt8(DW_CFA_def_cfa_register);
Asm->EOL("DW_CFA_def_cfa_register");
Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Dst.getRegister()));
Asm->EOL("Register");
} else {
assert(0 && "Machine move no supported yet.");
}
} else {
unsigned Reg = RI->getDwarfRegNum(Src.getRegister());
int Offset = Dst.getOffset() / stackGrowth;
if (Offset < 0) {
Asm->EmitInt8(DW_CFA_offset_extended_sf);
Asm->EOL("DW_CFA_offset_extended_sf");
Asm->EmitULEB128Bytes(Reg);
Asm->EOL("Reg");
Asm->EmitSLEB128Bytes(Offset);
Asm->EOL("Offset");
} else if (Reg < 64) {
Asm->EmitInt8(DW_CFA_offset + Reg);
Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
Asm->EmitULEB128Bytes(Offset);
Asm->EOL("Offset");
} else {
Asm->EmitInt8(DW_CFA_offset_extended);
Asm->EOL("DW_CFA_offset_extended");
Asm->EmitULEB128Bytes(Reg);
Asm->EOL("Reg");
Asm->EmitULEB128Bytes(Offset);
Asm->EOL("Offset");
}
}
}
}
};
//===----------------------------------------------------------------------===//
/// DwarfDebug - Emits Dwarf debug directives.
///
class DwarfDebug : public Dwarf {
private:
//===--------------------------------------------------------------------===//
// 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 MMI.
std::vector<CompileUnit *> CompileUnits;
/// AbbreviationsSet - Used to uniquely define abbreviations.
///
FoldingSet<DIEAbbrev> AbbreviationsSet;
/// Abbreviations - A list of all the unique abbreviations in use.
///
std::vector<DIEAbbrev *> Abbreviations;
/// ValuesSet - Used to uniquely define values.
///
FoldingSet<DIEValue> ValuesSet;
/// Values - A list of all the unique values in use.
///
std::vector<DIEValue *> Values;
/// StringPool - A UniqueVector of strings used by indirect references.
///
UniqueVector<std::string> StringPool;
/// UnitMap - Map debug information descriptor to compile unit.
///
std::map<DebugInfoDesc *, CompileUnit *> DescToUnitMap;
/// 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;
/// didInitial - Flag to indicate if initial emission has been done.
///
bool didInitial;
/// shouldEmit - Flag to indicate if debug information should be emitted.
///
bool shouldEmit;
struct FunctionDebugFrameInfo {
unsigned Number;
std::vector<MachineMove> Moves;
FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M):
Number(Num), Moves(M) { }
};
std::vector<FunctionDebugFrameInfo> DebugFrames;
public:
/// ShouldEmitDwarf - Returns true if Dwarf declarations should be made.
///
bool ShouldEmitDwarf() const { return shouldEmit; }
/// AssignAbbrevNumber - Define a unique number for the abbreviation.
///
void 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 NewString(const std::string &String) {
unsigned StringID = StringPool.insert(String);
return DWLabel("string", StringID);
}
/// NewDIEntry - Creates a new DIEntry to be a proxy for a debug information
/// entry.
DIEntry *NewDIEntry(DIE *Entry = NULL) {
DIEntry *Value;
if (Entry) {
FoldingSetNodeID ID;
DIEntry::Profile(ID, Entry);
void *Where;
Value = static_cast<DIEntry *>(ValuesSet.FindNodeOrInsertPos(ID, Where));
if (Value) return Value;
Value = new DIEntry(Entry);
ValuesSet.InsertNode(Value, Where);
} else {
Value = new DIEntry(Entry);
}
Values.push_back(Value);
return Value;
}
/// SetDIEntry - Set a DIEntry once the debug information entry is defined.
///
void SetDIEntry(DIEntry *Value, DIE *Entry) {
Value->Entry = Entry;
// Add to values set if not already there. If it is, we merely have a
// duplicate in the values list (no harm.)
ValuesSet.GetOrInsertNode(Value);
}
/// AddUInt - Add an unsigned integer attribute data and value.
///
void AddUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer) {
if (!Form) Form = DIEInteger::BestForm(false, Integer);
FoldingSetNodeID ID;
DIEInteger::Profile(ID, Integer);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIEInteger(Integer);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddSInt - Add an signed integer attribute data and value.
///
void AddSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer) {
if (!Form) Form = DIEInteger::BestForm(true, Integer);
FoldingSetNodeID ID;
DIEInteger::Profile(ID, (uint64_t)Integer);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIEInteger(Integer);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddString - Add a std::string attribute data and value.
///
void AddString(DIE *Die, unsigned Attribute, unsigned Form,
const std::string &String) {
FoldingSetNodeID ID;
DIEString::Profile(ID, String);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIEString(String);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddLabel - Add a Dwarf label attribute data and value.
///
void AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
const DWLabel &Label) {
FoldingSetNodeID ID;
DIEDwarfLabel::Profile(ID, Label);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIEDwarfLabel(Label);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddObjectLabel - Add an non-Dwarf label attribute data and value.
///
void AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
const std::string &Label) {
FoldingSetNodeID ID;
DIEObjectLabel::Profile(ID, Label);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIEObjectLabel(Label);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddDelta - Add a label delta attribute data and value.
///
void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
const DWLabel &Hi, const DWLabel &Lo) {
FoldingSetNodeID ID;
DIEDelta::Profile(ID, Hi, Lo);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIEDelta(Hi, Lo);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddDIEntry - Add a DIE attribute data and value.
///
void AddDIEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
Die->AddValue(Attribute, Form, NewDIEntry(Entry));
}
/// AddBlock - Add block data.
///
void AddBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block) {
Block->ComputeSize(*this);
FoldingSetNodeID ID;
Block->Profile(ID);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = Block;
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
} else {
// Already exists, reuse the previous one.
delete Block;
Block = cast<DIEBlock>(Value);
}
Die->AddValue(Attribute, Block->BestForm(), Value);
}
private:
/// AddSourceLine - Add location information to specified debug information
/// entry.
void AddSourceLine(DIE *Die, CompileUnitDesc *File, unsigned Line) {
if (File && Line) {
CompileUnit *FileUnit = FindCompileUnit(File);
unsigned FileID = FileUnit->getID();
AddUInt(Die, DW_AT_decl_file, 0, FileID);
AddUInt(Die, DW_AT_decl_line, 0, Line);
}
}
/// AddAddress - Add an address attribute to a die based on the location
/// provided.
void AddAddress(DIE *Die, unsigned Attribute,
const MachineLocation &Location) {
unsigned Reg = RI->getDwarfRegNum(Location.getRegister());
DIEBlock *Block = new DIEBlock();
if (Location.isRegister()) {
if (Reg < 32) {
AddUInt(Block, 0, DW_FORM_data1, DW_OP_reg0 + Reg);
} else {
AddUInt(Block, 0, DW_FORM_data1, DW_OP_regx);
AddUInt(Block, 0, DW_FORM_udata, Reg);
}
} else {
if (Reg < 32) {
AddUInt(Block, 0, DW_FORM_data1, DW_OP_breg0 + Reg);
} else {
AddUInt(Block, 0, DW_FORM_data1, DW_OP_bregx);
AddUInt(Block, 0, DW_FORM_udata, Reg);
}
AddUInt(Block, 0, DW_FORM_sdata, Location.getOffset());
}
AddBlock(Die, Attribute, 0, Block);
}
/// AddBasicType - Add a new basic type attribute to the specified entity.
///
void AddBasicType(DIE *Entity, CompileUnit *Unit,
const std::string &Name,
unsigned Encoding, unsigned Size) {
DIE *Die = ConstructBasicType(Unit, Name, Encoding, Size);
AddDIEntry(Entity, DW_AT_type, DW_FORM_ref4, Die);
}
/// ConstructBasicType - Construct a new basic type.
///
DIE *ConstructBasicType(CompileUnit *Unit,
const std::string &Name,
unsigned Encoding, unsigned Size) {
DIE Buffer(DW_TAG_base_type);
AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
AddUInt(&Buffer, DW_AT_encoding, DW_FORM_data1, Encoding);
if (!Name.empty()) AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
return Unit->AddDie(Buffer);
}
/// AddPointerType - Add a new pointer type attribute to the specified entity.
///
void AddPointerType(DIE *Entity, CompileUnit *Unit, const std::string &Name) {
DIE *Die = ConstructPointerType(Unit, Name);
AddDIEntry(Entity, DW_AT_type, DW_FORM_ref4, Die);
}
/// ConstructPointerType - Construct a new pointer type.
///
DIE *ConstructPointerType(CompileUnit *Unit, const std::string &Name) {
DIE Buffer(DW_TAG_pointer_type);
AddUInt(&Buffer, DW_AT_byte_size, 0, TD->getPointerSize());
if (!Name.empty()) AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
return Unit->AddDie(Buffer);
}
/// AddType - Add a new type attribute to the specified entity.
///
void AddType(DIE *Entity, TypeDesc *TyDesc, CompileUnit *Unit) {
if (!TyDesc) {
AddBasicType(Entity, Unit, "", DW_ATE_signed, sizeof(int32_t));
} else {
// Check for pre-existence.
DIEntry *&Slot = Unit->getDIEntrySlotFor(TyDesc);
// If it exists then use the existing value.
if (Slot) {
Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
return;
}
if (SubprogramDesc *SubprogramTy = dyn_cast<SubprogramDesc>(TyDesc)) {
// FIXME - Not sure why programs and variables are coming through here.
// Short cut for handling subprogram types (not really a TyDesc.)
AddPointerType(Entity, Unit, SubprogramTy->getName());
} else if (GlobalVariableDesc *GlobalTy =
dyn_cast<GlobalVariableDesc>(TyDesc)) {
// FIXME - Not sure why programs and variables are coming through here.
// Short cut for handling global variable types (not really a TyDesc.)
AddPointerType(Entity, Unit, GlobalTy->getName());
} else {
// Set up proxy.
Slot = NewDIEntry();
// Construct type.
DIE Buffer(DW_TAG_base_type);
ConstructType(Buffer, TyDesc, Unit);
// Add debug information entry to entity and unit.
DIE *Die = Unit->AddDie(Buffer);
SetDIEntry(Slot, Die);
Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
}
}
}
/// ConstructType - Adds all the required attributes to the type.
///
void ConstructType(DIE &Buffer, TypeDesc *TyDesc, CompileUnit *Unit) {
// 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
Buffer.setTag(DW_TAG_base_type);
AddUInt(&Buffer, DW_AT_encoding, DW_FORM_data1, BasicTy->getEncoding());
} else if (DerivedTypeDesc *DerivedTy = dyn_cast<DerivedTypeDesc>(TyDesc)) {
// Fetch tag.
unsigned Tag = DerivedTy->getTag();
// FIXME - Workaround for templates.
if (Tag == DW_TAG_inheritance) Tag = DW_TAG_reference_type;
// Pointers, typedefs et al.
Buffer.setTag(Tag);
// Map to main type, void will not have a type.
if (TypeDesc *FromTy = DerivedTy->getFromType())
AddType(&Buffer, FromTy, Unit);
} else if (CompositeTypeDesc *CompTy = dyn_cast<CompositeTypeDesc>(TyDesc)){
// Fetch tag.
unsigned Tag = CompTy->getTag();
// Set tag accordingly.
if (Tag == DW_TAG_vector_type)
Buffer.setTag(DW_TAG_array_type);
else
Buffer.setTag(Tag);
std::vector<DebugInfoDesc *> &Elements = CompTy->getElements();
switch (Tag) {
case DW_TAG_vector_type:
AddUInt(&Buffer, DW_AT_GNU_vector, DW_FORM_flag, 1);
// Fall thru
case DW_TAG_array_type: {
// Add element type.
if (TypeDesc *FromTy = CompTy->getFromType())
AddType(&Buffer, FromTy, Unit);
// Don't emit size attribute.
Size = 0;
// Construct an anonymous type for index type.
DIE *IndexTy = ConstructBasicType(Unit, "", DW_ATE_signed,
sizeof(int32_t));
// 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) {
AddDIEntry(Subrange, DW_AT_type, DW_FORM_ref4, IndexTy);
// Only add low if non-zero.
if (Lo) AddSInt(Subrange, DW_AT_lower_bound, 0, Lo);
AddSInt(Subrange, DW_AT_upper_bound, 0, Hi);
}
Buffer.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();
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())
AddString(Member, 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;
// Set the member type.
TypeDesc *FromTy = MemberDesc->getFromType();
AddType(Member, FromTy, Unit);
// Walk up typedefs until a real size is found.
while (FromTy) {
if (FromTy->getTag() != DW_TAG_typedef) {
FieldSize = FromTy->getSize();
FieldAlign = FromTy->getSize();
break;
}
FromTy = cast<DerivedTypeDesc>(FromTy)->getFromType();
}
// 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.
AddUInt(Member, DW_AT_byte_size, 0, FieldSize >> 3);
AddUInt(Member, DW_AT_bit_size, 0, Size);
AddUInt(Member, DW_AT_bit_offset, 0, Offset);
}
// Add computation for offset.
DIEBlock *Block = new DIEBlock();
AddUInt(Block, 0, DW_FORM_data1, DW_OP_plus_uconst);
AddUInt(Block, 0, DW_FORM_udata, FieldOffset >> 3);
AddBlock(Member, DW_AT_data_member_location, 0, Block);
// Add accessibility (public default unless is base class.
if (MemberDesc->isProtected()) {
AddUInt(Member, DW_AT_accessibility, 0, DW_ACCESS_protected);
} else if (MemberDesc->isPrivate()) {
AddUInt(Member, DW_AT_accessibility, 0, DW_ACCESS_private);
} else if (Tag == DW_TAG_inheritance) {
AddUInt(Member, DW_AT_accessibility, 0, DW_ACCESS_public);
}
Buffer.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->getName();
const std::string &LinkageName = StaticDesc->getLinkageName();
AddString(Static, DW_AT_name, DW_FORM_string, Name);
if (!LinkageName.empty()) {
AddString(Static, DW_AT_MIPS_linkage_name, DW_FORM_string,
LinkageName);
}
// Add location.
AddSourceLine(Static, StaticDesc->getFile(), StaticDesc->getLine());
// Add type.
if (TypeDesc *StaticTy = StaticDesc->getType())
AddType(Static, StaticTy, Unit);
// Add flags.
if (!StaticDesc->isStatic())
AddUInt(Static, DW_AT_external, DW_FORM_flag, 1);
AddUInt(Static, DW_AT_declaration, DW_FORM_flag, 1);
Buffer.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->getName();
const std::string &LinkageName = MethodDesc->getLinkageName();
AddString(Method, DW_AT_name, DW_FORM_string, Name);
bool IsCTor = TyDesc->getName() == Name;
if (!LinkageName.empty()) {
AddString(Method, DW_AT_MIPS_linkage_name, DW_FORM_string,
LinkageName);
}
// 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.
AddType(Method, 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);
AddType(Arg, cast<TypeDesc>(Args[i]), Unit);
AddUInt(Arg, DW_AT_artificial, DW_FORM_flag, 1);
Method->AddChild(Arg);
}
}
// Add flags.
if (!MethodDesc->isStatic())
AddUInt(Method, DW_AT_external, DW_FORM_flag, 1);
AddUInt(Method, DW_AT_declaration, DW_FORM_flag, 1);
Buffer.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);
AddString(Enumerator, DW_AT_name, DW_FORM_string, Name);
AddSInt(Enumerator, DW_AT_const_value, DW_FORM_sdata, Value);
Buffer.AddChild(Enumerator);
}
break;
}
case DW_TAG_subroutine_type: {
// Add prototype flag.
AddUInt(&Buffer, DW_AT_prototyped, DW_FORM_flag, 1);
// Add return type.
AddType(&Buffer, 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);
AddType(Arg, cast<TypeDesc>(Elements[i]), Unit);
Buffer.AddChild(Arg);
}
break;
}
default: break;
}
}
// Add size if non-zero (derived types don't have a size.)
if (Size) AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
// Add name if not anonymous or intermediate type.
if (!Name.empty()) AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
// Add source line info if available.
AddSourceLine(&Buffer, TyDesc->getFile(), TyDesc->getLine());
}
/// NewCompileUnit - Create new compile unit and it's debug information entry.
///
CompileUnit *NewCompileUnit(CompileUnitDesc *UnitDesc, unsigned ID) {
// Construct debug information entry.
DIE *Die = new DIE(DW_TAG_compile_unit);
if (TAI->isAbsoluteDebugSectionOffsets())
AddLabel(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0));
else
AddDelta(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0),
DWLabel("section_line", 0));
AddString(Die, DW_AT_producer, DW_FORM_string, UnitDesc->getProducer());
AddUInt (Die, DW_AT_language, DW_FORM_data1, UnitDesc->getLanguage());
AddString(Die, DW_AT_name, DW_FORM_string, UnitDesc->getFileName());
AddString(Die, DW_AT_comp_dir, DW_FORM_string, UnitDesc->getDirectory());
// Construct compile unit.
CompileUnit *Unit = new CompileUnit(UnitDesc, ID, Die);
// Add Unit to compile unit map.
DescToUnitMap[UnitDesc] = Unit;
return Unit;
}
/// GetBaseCompileUnit - Get the main compile unit.
///
CompileUnit *GetBaseCompileUnit() const {
CompileUnit *Unit = CompileUnits[0];
assert(Unit && "Missing compile unit.");
return Unit;
}
/// FindCompileUnit - Get the compile unit for the given descriptor.
///
CompileUnit *FindCompileUnit(CompileUnitDesc *UnitDesc) {
CompileUnit *Unit = DescToUnitMap[UnitDesc];
assert(Unit && "Missing compile unit.");
return Unit;
}
/// NewGlobalVariable - Add a new global variable DIE.
///
DIE *NewGlobalVariable(GlobalVariableDesc *GVD) {
// Get the compile unit context.
CompileUnitDesc *UnitDesc =
static_cast<CompileUnitDesc *>(GVD->getContext());
CompileUnit *Unit = GetBaseCompileUnit();
// 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->getName();
const std::string &FullName = GVD->getFullName();
const std::string &LinkageName = GVD->getLinkageName();
// Create the global's variable DIE.
DIE *VariableDie = new DIE(DW_TAG_variable);
AddString(VariableDie, DW_AT_name, DW_FORM_string, Name);
if (!LinkageName.empty()) {
AddString(VariableDie, DW_AT_MIPS_linkage_name, DW_FORM_string,
LinkageName);
}
AddType(VariableDie, GVD->getType(), Unit);
if (!GVD->isStatic())
AddUInt(VariableDie, DW_AT_external, DW_FORM_flag, 1);
// Add source line info if available.
AddSourceLine(VariableDie, UnitDesc, GVD->getLine());
// Add address.
DIEBlock *Block = new DIEBlock();
AddUInt(Block, 0, DW_FORM_data1, DW_OP_addr);
AddObjectLabel(Block, 0, DW_FORM_udata, Asm->getGlobalLinkName(GV));
AddBlock(VariableDie, 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(FullName, VariableDie);
return VariableDie;
}
/// NewSubprogram - Add a new subprogram DIE.
///
DIE *NewSubprogram(SubprogramDesc *SPD) {
// Get the compile unit context.
CompileUnitDesc *UnitDesc =
static_cast<CompileUnitDesc *>(SPD->getContext());
CompileUnit *Unit = GetBaseCompileUnit();
// 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->getName();
const std::string &FullName = SPD->getFullName();
const std::string &LinkageName = SPD->getLinkageName();
DIE *SubprogramDie = new DIE(DW_TAG_subprogram);
AddString(SubprogramDie, DW_AT_name, DW_FORM_string, Name);
if (!LinkageName.empty()) {
AddString(SubprogramDie, DW_AT_MIPS_linkage_name, DW_FORM_string,
LinkageName);
}
if (SPD->getType()) AddType(SubprogramDie, SPD->getType(), Unit);
if (!SPD->isStatic())
AddUInt(SubprogramDie, DW_AT_external, DW_FORM_flag, 1);
AddUInt(SubprogramDie, 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(FullName, SubprogramDie);
return SubprogramDie;
}
/// NewScopeVariable - Create a new scope variable.
///
DIE *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);
AddString(VariableDie, DW_AT_name, DW_FORM_string, VD->getName());
// Add source line info if available.
AddSourceLine(VariableDie, VD->getFile(), VD->getLine());
// Add variable type.
AddType(VariableDie, VD->getType(), Unit);
// 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 ConstructScope(DebugScope *ParentScope,
unsigned ParentStartID, unsigned ParentEndID,
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 = MMI->MappedLabel(Scope->getStartLabelID());
unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
// Ignore empty scopes.
if (StartID == EndID && StartID != 0) continue;
if (Scope->getScopes().empty() && Scope->getVariables().empty()) continue;
if (StartID == ParentStartID && EndID == ParentEndID) {
// Just add stuff to the parent scope.
ConstructScope(Scope, ParentStartID, ParentEndID, ParentDie, Unit);
} else {
DIE *ScopeDie = new DIE(DW_TAG_lexical_block);
// Add the scope bounds.
if (StartID) {
AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
DWLabel("label", StartID));
} else {
AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
}
if (EndID) {
AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
DWLabel("label", EndID));
} else {
AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
}
// Add the scope contents.
ConstructScope(Scope, StartID, EndID, ScopeDie, Unit);
ParentDie->AddChild(ScopeDie);
}
}
}
/// ConstructRootScope - Construct the scope for the subprogram.
///
void 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.
CompileUnit *Unit = GetBaseCompileUnit();
// Get the subprogram die.
DIE *SPDie = Unit->getDieMapSlotFor(SPD);
assert(SPDie && "Missing subprogram descriptor");
// Add the function bounds.
AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
AddLabel(SPDie, 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, 0, 0, SPDie, Unit);
}
/// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
/// tools to recognize the object file contains Dwarf information.
void EmitInitial() {
// Check to see if we already emitted intial headers.
if (didInitial) return;
didInitial = true;
// Dwarf sections base addresses.
if (TAI->doesDwarfRequireFrameSection()) {
Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
EmitLabel("section_debug_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);
}
/// EmitDIE - Recusively Emits a debug information entry.
///
void EmitDIE(DIE *Die) {
// Get the abbreviation for this DIE.
unsigned AbbrevNumber = Die->getAbbrevNumber();
const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
Asm->EOL();
// Emit the code (index) for the abbreviation.
Asm->EmitULEB128Bytes(AbbrevNumber);
Asm->EOL(std::string("Abbrev [" +
utostr(AbbrevNumber) +
"] 0x" + utohexstr(Die->getOffset()) +
":0x" + utohexstr(Die->getSize()) + " " +
TagString(Abbrev->getTag())));
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: {
Asm->EmitInt32(Die->SiblingOffset());
break;
}
default: {
// Emit an attribute using the defined form.
Values[i]->EmitValue(*this, Form);
break;
}
}
Asm->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]);
}
Asm->EmitInt8(0); Asm->EOL("End Of Children Mark");
}
}
/// SizeAndOffsetDie - Compute the size and offset of a DIE.
///
unsigned 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.
AssignAbbrevNumber(Die->getAbbrev());
// 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 += Asm->SizeULEB128(AbbrevNumber);
const std::vector<DIEValue *> &Values = Die->getValues();
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev->getData();
// Size 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());
}
// Size 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 SizeAndOffsets() {
// Process base compile unit.
CompileUnit *Unit = GetBaseCompileUnit();
// 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, true);
}
/// EmitDebugInfo - Emit the debug info section.
///
void EmitDebugInfo() {
// Start debug info section.
Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
CompileUnit *Unit = GetBaseCompileUnit();
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)
sizeof(int32_t); // FIXME - extra pad for gdb bug.
Asm->EmitInt32(ContentSize); Asm->EOL("Length of Compilation Unit Info");
Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
Asm->EOL("Offset Into Abbrev. Section");
Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
EmitDIE(Die);
// FIXME - extra padding for gdb bug.
Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
EmitLabel("info_end", Unit->getID());
Asm->EOL();
}
/// EmitAbbreviations - Emit the abbreviation section.
///
void 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.)
Asm->EmitULEB128Bytes(Abbrev->getNumber());
Asm->EOL("Abbreviation Code");
// Emit the abbreviations data.
Abbrev->Emit(*this);
Asm->EOL();
}
// Mark end of abbreviations.
Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
EmitLabel("abbrev_end", 0);
Asm->EOL();
}
}
/// EmitDebugLines - Emit source line information.
///
void EmitDebugLines() {
// If there are no lines to emit (such as when we're using .loc directives
// to emit .debug_line information) don't emit a .debug_line header.
if (SectionSourceLines.empty())
return;
// 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, true);
Asm->EOL("Length of Source Line Info");
EmitLabel("line_begin", 0);
Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
Asm->EOL("Prolog Length");
EmitLabel("line_prolog_begin", 0);
Asm->EmitInt8(1); Asm->EOL("Minimum Instruction Length");
Asm->EmitInt8(1); Asm->EOL("Default is_stmt_start flag");
Asm->EmitInt8(MinLineDelta); Asm->EOL("Line Base Value (Special Opcodes)");
Asm->EmitInt8(MaxLineDelta); Asm->EOL("Line Range Value (Special Opcodes)");
Asm->EmitInt8(-MinLineDelta); Asm->EOL("Special Opcode Base");
// Line number standard opcode encodings argument count
Asm->EmitInt8(0); Asm->EOL("DW_LNS_copy arg count");
Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_pc arg count");
Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_line arg count");
Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_file arg count");
Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_column arg count");
Asm->EmitInt8(0); Asm->EOL("DW_LNS_negate_stmt arg count");
Asm->EmitInt8(0); Asm->EOL("DW_LNS_set_basic_block arg count");
Asm->EmitInt8(0); Asm->EOL("DW_LNS_const_add_pc arg count");
Asm->EmitInt8(1); Asm->EOL("DW_LNS_fixed_advance_pc arg count");
const UniqueVector<std::string> &Directories = MMI->getDirectories();
const UniqueVector<SourceFileInfo>
&SourceFiles = MMI->getSourceFiles();
// Emit directories.
for (unsigned DirectoryID = 1, NDID = Directories.size();
DirectoryID <= NDID; ++DirectoryID) {
Asm->EmitString(Directories[DirectoryID]); Asm->EOL("Directory");
}
Asm->EmitInt8(0); Asm->EOL("End of directories");
// Emit files.
for (unsigned SourceID = 1, NSID = SourceFiles.size();
SourceID <= NSID; ++SourceID) {
const SourceFileInfo &SourceFile = SourceFiles[SourceID];
Asm->EmitString(SourceFile.getName());
Asm->EOL("Source");
Asm->EmitULEB128Bytes(SourceFile.getDirectoryID());
Asm->EOL("Directory #");
Asm->EmitULEB128Bytes(0);
Asm->EOL("Mod date");
Asm->EmitULEB128Bytes(0);
Asm->EOL("File size");
}
Asm->EmitInt8(0); Asm->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];
Asm->EOL(std::string("Section ") + SectionMap[j + 1]);
// 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 = MMI->MappedLabel(LineInfo.getLabelID());
if (!LabelID) continue;
unsigned SourceID = LineInfo.getSourceID();
const SourceFileInfo &SourceFile = SourceFiles[SourceID];
unsigned DirectoryID = SourceFile.getDirectoryID();
Asm->EOL(Directories[DirectoryID]
+ SourceFile.getName()
+ ":"
+ utostr_32(LineInfo.getLine()));
// Define the line address.
Asm->EmitInt8(0); Asm->EOL("Extended Op");
Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
EmitReference("label", LabelID); Asm->EOL("Location label");
// If change of source, then switch to the new source.
if (Source != LineInfo.getSourceID()) {
Source = LineInfo.getSourceID();
Asm->EmitInt8(DW_LNS_set_file); Asm->EOL("DW_LNS_set_file");
Asm->EmitULEB128Bytes(Source); Asm->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.
Asm->EmitInt8(Delta - MinLineDelta); Asm->EOL("Line Delta");
} else {
// ... otherwise use long hand.
Asm->EmitInt8(DW_LNS_advance_line); Asm->EOL("DW_LNS_advance_line");
Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
}
} else {
// Copy the previous row (different address or source)
Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
}
}
// Define last address of section.
Asm->EmitInt8(0); Asm->EOL("Extended Op");
Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
EmitReference("section_end", j + 1); Asm->EOL("Section end label");
// Mark end of matrix.
Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
Asm->EmitULEB128Bytes(1); Asm->EOL();
Asm->EmitInt8(1); Asm->EOL();
}
EmitLabel("line_end", 0);
Asm->EOL();
}
/// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
///
void EmitCommonDebugFrame() {
if (!TAI->doesDwarfRequireFrameSection())
return;
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize();
// Start the dwarf frame section.
Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
EmitLabel("debug_frame_common", 0);
EmitDifference("debug_frame_common_end", 0,
"debug_frame_common_begin", 0, true);
Asm->EOL("Length of Common Information Entry");
EmitLabel("debug_frame_common_begin", 0);
Asm->EmitInt32((int)DW_CIE_ID);
Asm->EOL("CIE Identifier Tag");
Asm->EmitInt8(DW_CIE_VERSION);
Asm->EOL("CIE Version");
Asm->EmitString("");
Asm->EOL("CIE Augmentation");
Asm->EmitULEB128Bytes(1);
Asm->EOL("CIE Code Alignment Factor");
Asm->EmitSLEB128Bytes(stackGrowth);
Asm->EOL("CIE Data Alignment Factor");
Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister()));
Asm->EOL("CIE RA Column");
std::vector<MachineMove> Moves;
RI->getInitialFrameState(Moves);
EmitFrameMoves(NULL, 0, Moves);
Asm->EmitAlignment(2);
EmitLabel("debug_frame_common_end", 0);
Asm->EOL();
}
/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void EmitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
if (!TAI->doesDwarfRequireFrameSection())
return;
// Start the dwarf frame section.
Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
EmitDifference("debug_frame_end", DebugFrameInfo.Number,
"debug_frame_begin", DebugFrameInfo.Number, true);
Asm->EOL("Length of Frame Information Entry");
EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
EmitSectionOffset("debug_frame_common", "section_debug_frame",
0, 0, true, false);
Asm->EOL("FDE CIE offset");
EmitReference("func_begin", DebugFrameInfo.Number);
Asm->EOL("FDE initial location");
EmitDifference("func_end", DebugFrameInfo.Number,
"func_begin", DebugFrameInfo.Number);
Asm->EOL("FDE address range");
EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves);
Asm->EmitAlignment(2);
EmitLabel("debug_frame_end", DebugFrameInfo.Number);
Asm->EOL();
}
/// EmitDebugPubNames - Emit visible names into a debug pubnames section.
///
void EmitDebugPubNames() {
// Start the dwarf pubnames section.
Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
CompileUnit *Unit = GetBaseCompileUnit();
EmitDifference("pubnames_end", Unit->getID(),
"pubnames_begin", Unit->getID(), true);
Asm->EOL("Length of Public Names Info");
EmitLabel("pubnames_begin", Unit->getID());
Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF Version");
EmitSectionOffset("info_begin", "section_info",
Unit->getID(), 0, true, false);
Asm->EOL("Offset of Compilation Unit Info");
EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),true);
Asm->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;
Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
Asm->EmitString(Name); Asm->EOL("External Name");
}
Asm->EmitInt32(0); Asm->EOL("End Mark");
EmitLabel("pubnames_end", Unit->getID());
Asm->EOL();
}
/// EmitDebugStr - Emit visible names into a debug str section.
///
void 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];
Asm->EmitString(String); Asm->EOL();
}
Asm->EOL();
}
}
/// EmitDebugLoc - Emit visible names into a debug loc section.
///
void EmitDebugLoc() {
// Start the dwarf loc section.
Asm->SwitchToDataSection(TAI->getDwarfLocSection());
Asm->EOL();
}
/// EmitDebugARanges - Emit visible names into a debug aranges section.
///
void EmitDebugARanges() {
// Start the dwarf aranges section.
Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
// FIXME - Mock up
#if 0
CompileUnit *Unit = GetBaseCompileUnit();
// Don't include size of length
Asm->EmitInt32(0x1c); Asm->EOL("Length of Address Ranges Info");
Asm->EmitInt16(DWARF_VERSION); Asm->EOL("Dwarf Version");
EmitReference("info_begin", Unit->getID());
Asm->EOL("Offset of Compilation Unit Info");
Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Size of Address");
Asm->EmitInt8(0); Asm->EOL("Size of Segment Descriptor");
Asm->EmitInt16(0); Asm->EOL("Pad (1)");
Asm->EmitInt16(0); Asm->EOL("Pad (2)");
// Range 1
EmitReference("text_begin", 0); Asm->EOL("Address");
EmitDifference("text_end", 0, "text_begin", 0, true); Asm->EOL("Length");
Asm->EmitInt32(0); Asm->EOL("EOM (1)");
Asm->EmitInt32(0); Asm->EOL("EOM (2)");
#endif
Asm->EOL();
}
/// EmitDebugRanges - Emit visible names into a debug ranges section.
///
void EmitDebugRanges() {
// Start the dwarf ranges section.
Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
Asm->EOL();
}
/// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
///
void EmitDebugMacInfo() {
// Start the dwarf macinfo section.
Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
Asm->EOL();
}
/// ConstructCompileUnitDIEs - Create a compile unit DIE for each source and
/// header file.
void ConstructCompileUnitDIEs() {
const UniqueVector<CompileUnitDesc *> CUW = MMI->getCompileUnits();
for (unsigned i = 1, N = CUW.size(); i <= N; ++i) {
unsigned ID = MMI->RecordSource(CUW[i]);
CompileUnit *Unit = NewCompileUnit(CUW[i], ID);
CompileUnits.push_back(Unit);
}
}
/// ConstructGlobalDIEs - Create DIEs for each of the externally visible
/// global variables.
void ConstructGlobalDIEs() {
std::vector<GlobalVariableDesc *> GlobalVariables =
MMI->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 ConstructSubprogramDIEs() {
std::vector<SubprogramDesc *> Subprograms =
MMI->getAnchoredDescriptors<SubprogramDesc>(*M);
for (unsigned i = 0, N = Subprograms.size(); i < N; ++i) {
SubprogramDesc *SPD = Subprograms[i];
NewSubprogram(SPD);
}
}
public:
//===--------------------------------------------------------------------===//
// Main entry points.
//
DwarfDebug(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
: Dwarf(OS, A, T, "dbg")
, CompileUnits()
, AbbreviationsSet(InitAbbreviationsSetSize)
, Abbreviations()
, ValuesSet(InitValuesSetSize)
, Values()
, StringPool()
, DescToUnitMap()
, SectionMap()
, SectionSourceLines()
, didInitial(false)
, shouldEmit(false)
{
}
virtual ~DwarfDebug() {
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i)
delete CompileUnits[i];
for (unsigned j = 0, M = Values.size(); j < M; ++j)
delete Values[j];
}
/// SetModuleInfo - Set machine module information when it's known that pass
/// manager has created it. Set by the target AsmPrinter.
void SetModuleInfo(MachineModuleInfo *mmi) {
// Make sure initial declarations are made.
if (!MMI && mmi->hasDebugInfo()) {
MMI = mmi;
shouldEmit = true;
// 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(TAI->getTextSection());
// Print out .file directives to specify files for .loc directives. These
// are printed out early so that they precede any .loc directives.
if (TAI->hasDotLocAndDotFile()) {
const UniqueVector<SourceFileInfo> &SourceFiles = MMI->getSourceFiles();
const UniqueVector<std::string> &Directories = MMI->getDirectories();
for (unsigned i = 1, e = SourceFiles.size(); i <= e; ++i) {
sys::Path FullPath(Directories[SourceFiles[i].getDirectoryID()]);
bool AppendOk = FullPath.appendComponent(SourceFiles[i].getName());
assert(AppendOk && "Could not append filename to directory!");
Asm->EmitFile(i, FullPath.toString());
Asm->EOL();
}
}
// Emit initial sections
EmitInitial();
}
}
/// BeginModule - Emit all Dwarf sections that should come prior to the
/// content.
void BeginModule(Module *M) {
this->M = M;
if (!ShouldEmitDwarf()) return;
}
/// EndModule - Emit all Dwarf sections that should come after the content.
///
void EndModule() {
if (!ShouldEmitDwarf()) return;
// 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);
}
// Emit common frame information.
EmitCommonDebugFrame();
// Emit function debug frame information
for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
E = DebugFrames.end(); I != E; ++I)
EmitFunctionDebugFrame(*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 BeginFunction(MachineFunction *MF) {
this->MF = MF;
if (!ShouldEmitDwarf()) return;
// Begin accumulating function debug information.
MMI->BeginFunction(MF);
// Assumes in correct section after the entry point.
EmitLabel("func_begin", ++SubprogramCount);
}
/// EndFunction - Gather and emit post-function debug information.
///
void EndFunction() {
if (!ShouldEmitDwarf()) return;
// Define end label for subprogram.
EmitLabel("func_end", SubprogramCount);
// Get function line info.
const std::vector<SourceLineInfo> &LineInfos = MMI->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(MMI->getRootScope());
DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
MMI->getFrameMoves()));
}
};
//===----------------------------------------------------------------------===//
/// DwarfException - Emits Dwarf exception handling directives.
///
class DwarfException : public Dwarf {
private:
struct FunctionEHFrameInfo {
std::string FnName;
unsigned Number;
unsigned PersonalityIndex;
bool hasCalls;
bool hasLandingPads;
std::vector<MachineMove> Moves;
FunctionEHFrameInfo(const std::string &FN, unsigned Num, unsigned P,
bool hC, bool hL,
const std::vector<MachineMove> &M):
FnName(FN), Number(Num), PersonalityIndex(P),
hasCalls(hC), hasLandingPads(hL), Moves(M) { }
};
std::vector<FunctionEHFrameInfo> EHFrames;
/// shouldEmit - Flag to indicate if debug information should be emitted.
///
bool shouldEmit;
/// EmitCommonEHFrame - Emit the common eh unwind frame.
///
void EmitCommonEHFrame(const Function *Personality, unsigned Index) {
// Size and sign of stack growth.
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize();
// Begin eh frame section.
Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
O << "EH_frame" << Index << ":\n";
EmitLabel("section_eh_frame", Index);
// Define base labels.
EmitLabel("eh_frame_common", Index);
// Define the eh frame length.
EmitDifference("eh_frame_common_end", Index,
"eh_frame_common_begin", Index, true);
Asm->EOL("Length of Common Information Entry");
// EH frame header.
EmitLabel("eh_frame_common_begin", Index);
Asm->EmitInt32((int)0);
Asm->EOL("CIE Identifier Tag");
Asm->EmitInt8(DW_CIE_VERSION);
Asm->EOL("CIE Version");
// The personality presence indicates that language specific information
// will show up in the eh frame.
Asm->EmitString(Personality ? "zPLR" : "zR");
Asm->EOL("CIE Augmentation");
// Round out reader.
Asm->EmitULEB128Bytes(1);
Asm->EOL("CIE Code Alignment Factor");
Asm->EmitSLEB128Bytes(stackGrowth);
Asm->EOL("CIE Data Alignment Factor");
Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister()));
Asm->EOL("CIE RA Column");
// If there is a personality, we need to indicate the functions location.
if (Personality) {
Asm->EmitULEB128Bytes(7);
Asm->EOL("Augmentation Size");
if (TAI->getNeedsIndirectEncoding())
Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect);
else
Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
Asm->EOL("Personality (pcrel sdata4 indirect)");
PrintRelDirective();
O << TAI->getPersonalityPrefix();
Asm->EmitExternalGlobal((const GlobalVariable *)(Personality));
O << TAI->getPersonalitySuffix();
O << "-" << TAI->getPCSymbol();
Asm->EOL("Personality");
Asm->EmitULEB128Bytes(DW_EH_PE_pcrel);
Asm->EOL("LSDA Encoding (pcrel)");
Asm->EmitULEB128Bytes(DW_EH_PE_pcrel);
Asm->EOL("FDE Encoding (pcrel)");
} else {
Asm->EmitULEB128Bytes(1);
Asm->EOL("Augmentation Size");
Asm->EmitULEB128Bytes(DW_EH_PE_pcrel);
Asm->EOL("FDE Encoding (pcrel)");
}
// Indicate locations of general callee saved registers in frame.
std::vector<MachineMove> Moves;
RI->getInitialFrameState(Moves);
EmitFrameMoves(NULL, 0, Moves);
Asm->EmitAlignment(2);
EmitLabel("eh_frame_common_end", Index);
Asm->EOL();
}
/// EmitEHFrame - Emit function exception frame information.
///
void EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
// Externally visible entry into the functions eh frame info.
if (const char *GlobalDirective = TAI->getGlobalDirective())
O << GlobalDirective << EHFrameInfo.FnName << "\n";
// If there are no calls then you can't unwind.
if (!EHFrameInfo.hasCalls) {
O << EHFrameInfo.FnName << " = 0\n";
} else {
O << EHFrameInfo.FnName << ":\n";
// EH frame header.
EmitDifference("eh_frame_end", EHFrameInfo.Number,
"eh_frame_begin", EHFrameInfo.Number, true);
Asm->EOL("Length of Frame Information Entry");
EmitLabel("eh_frame_begin", EHFrameInfo.Number);
EmitSectionOffset("eh_frame_begin", "eh_frame_common",
EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
true, true);
Asm->EOL("FDE CIE offset");
EmitReference("eh_func_begin", EHFrameInfo.Number, true);
Asm->EOL("FDE initial location");
EmitDifference("eh_func_end", EHFrameInfo.Number,
"eh_func_begin", EHFrameInfo.Number);
Asm->EOL("FDE address range");
// If there is a personality and landing pads then point to the language
// specific data area in the exception table.
if (EHFrameInfo.PersonalityIndex) {
Asm->EmitULEB128Bytes(4);
Asm->EOL("Augmentation size");
if (EHFrameInfo.hasLandingPads) {
EmitReference("exception", EHFrameInfo.Number, true);
} else if (TD->getPointerSize() == 8) {
Asm->EmitInt64((int)0);
} else {
Asm->EmitInt32((int)0);
}
Asm->EOL("Language Specific Data Area");
} else {
Asm->EmitULEB128Bytes(0);
Asm->EOL("Augmentation size");
}
// Indicate locations of function specific callee saved registers in
// frame.
EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves);
Asm->EmitAlignment(2);
EmitLabel("eh_frame_end", EHFrameInfo.Number);
}
if (const char *UsedDirective = TAI->getUsedDirective())
O << UsedDirective << EHFrameInfo.FnName << "\n\n";
}
/// EmitExceptionTable - Emit landing pads and actions.
///
/// The general organization of the table is complex, but the basic concepts
/// are easy. First there is a header which describes the location and
/// organization of the three components that follow.
/// 1. The landing pad site information describes the range of code covered
/// by the try. In our case it's an accumulation of the ranges covered
/// by the invokes in the try. There is also a reference to the landing
/// pad that handles the exception once processed. Finally an index into
/// the actions table.
/// 2. The action table, in our case, is composed of pairs of type ids
/// and next action offset. Starting with the action index from the
/// landing pad site, each type Id is checked for a match to the current
/// exception. If it matches then the exception and type id are passed
/// on to the landing pad. Otherwise the next action is looked up. This
/// chain is terminated with a next action of zero. If no type id is
/// found the the frame is unwound and handling continues.
/// 3. Type id table contains references to all the C++ typeinfo for all
/// catches in the function. This tables is reversed indexed base 1.
/// SharedTypeIds - How many leading type ids two landing pads have in common.
static unsigned SharedTypeIds(const LandingPadInfo *L,
const LandingPadInfo *R) {
const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
unsigned LSize = LIds.size(), RSize = RIds.size();
unsigned MinSize = LSize < RSize ? LSize : RSize;
unsigned Count = 0;
for (; Count != MinSize; ++Count)
if (LIds[Count] != RIds[Count])
return Count;
return Count;
}
/// PadLT - Order landing pads lexicographically by type id.
static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
unsigned LSize = LIds.size(), RSize = RIds.size();
unsigned MinSize = LSize < RSize ? LSize : RSize;
for (unsigned i = 0; i != MinSize; ++i)
if (LIds[i] != RIds[i])
return LIds[i] < RIds[i];
return LSize < RSize;
}
struct KeyInfo {
static inline unsigned getEmptyKey() { return -1U; }
static inline unsigned getTombstoneKey() { return -2U; }
static unsigned getHashValue(const unsigned &Key) { return Key; }
static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
static bool isPod() { return true; }
};
/// ActionEntry - Structure describing an entry in the actions table.
struct ActionEntry {
int ValueForTypeID; // The value to write - may not be equal to the type id.
int NextAction;
struct ActionEntry *Previous;
};
/// PadRange - Structure holding a try-range and the associated landing pad.
struct PadRange {
// The index of the landing pad.
unsigned PadIndex;
// The index of the begin and end labels in the landing pad's label lists.
unsigned RangeIndex;
};
typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
/// CallSiteEntry - Structure describing an entry in the call-site table.
struct CallSiteEntry {
unsigned BeginLabel; // zero indicates the start of the function.
unsigned EndLabel; // zero indicates the end of the function.
unsigned PadLabel; // zero indicates that there is no landing pad.
unsigned Action;
};
void EmitExceptionTable() {
// Map all labels and get rid of any dead landing pads.
MMI->TidyLandingPads();
const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
if (PadInfos.empty()) return;
// Sort the landing pads in order of their type ids. This is used to fold
// duplicate actions.
SmallVector<const LandingPadInfo *, 64> LandingPads;
LandingPads.reserve(PadInfos.size());
for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
LandingPads.push_back(&PadInfos[i]);
std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
// Negative type ids index into FilterIds, positive type ids index into
// TypeInfos. The value written for a positive type id is just the type
// id itself. For a negative type id, however, the value written is the
// (negative) byte offset of the corresponding FilterIds entry. The byte
// offset is usually equal to the type id, because the FilterIds entries
// are written using a variable width encoding which outputs one byte per
// entry as long as the value written is not too large, but can differ.
// This kind of complication does not occur for positive type ids because
// type infos are output using a fixed width encoding.
// FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
SmallVector<int, 16> FilterOffsets;
FilterOffsets.reserve(FilterIds.size());
int Offset = -1;
for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
E = FilterIds.end(); I != E; ++I) {
FilterOffsets.push_back(Offset);
Offset -= Asm->SizeULEB128(*I);
}
// Compute the actions table and gather the first action index for each
// landing pad site.
SmallVector<ActionEntry, 32> Actions;
SmallVector<unsigned, 64> FirstActions;
FirstActions.reserve(LandingPads.size());
int FirstAction = 0;
unsigned SizeActions = 0;
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
const LandingPadInfo *LP = LandingPads[i];
const std::vector<int> &TypeIds = LP->TypeIds;
const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
unsigned SizeSiteActions = 0;
if (NumShared < TypeIds.size()) {
unsigned SizeAction = 0;
ActionEntry *PrevAction = 0;
if (NumShared) {
const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
assert(Actions.size());
PrevAction = &Actions.back();
SizeAction = Asm->SizeSLEB128(PrevAction->NextAction) +
Asm->SizeSLEB128(PrevAction->ValueForTypeID);
for (unsigned j = NumShared; j != SizePrevIds; ++j) {
SizeAction -= Asm->SizeSLEB128(PrevAction->ValueForTypeID);
SizeAction += -PrevAction->NextAction;
PrevAction = PrevAction->Previous;
}
}
// Compute the actions.
for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
int TypeID = TypeIds[I];
assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
unsigned SizeTypeID = Asm->SizeSLEB128(ValueForTypeID);
int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
SizeAction = SizeTypeID + Asm->SizeSLEB128(NextAction);
SizeSiteActions += SizeAction;
ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
Actions.push_back(Action);
PrevAction = &Actions.back();
}
// Record the first action of the landing pad site.
FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
} // else identical - re-use previous FirstAction
FirstActions.push_back(FirstAction);
// Compute this sites contribution to size.
SizeActions += SizeSiteActions;
}
// Compute the call-site table. Entries must be ordered by address.
SmallVector<CallSiteEntry, 64> CallSites;
RangeMapType PadMap;
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
const LandingPadInfo *LandingPad = LandingPads[i];
for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
unsigned BeginLabel = LandingPad->BeginLabels[j];
assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
PadRange P = { i, j };
PadMap[BeginLabel] = P;
}
}
bool MayThrow = false;
unsigned LastLabel = 0;
const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
I != E; ++I) {
for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
MI != E; ++MI) {
if (MI->getOpcode() != TargetInstrInfo::LABEL) {
MayThrow |= TII->isCall(MI->getOpcode());
continue;
}
unsigned BeginLabel = MI->getOperand(0).getImmedValue();
assert(BeginLabel && "Invalid label!");
if (BeginLabel == LastLabel)
MayThrow = false;
RangeMapType::iterator L = PadMap.find(BeginLabel);
if (L == PadMap.end())
continue;
PadRange P = L->second;
const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
"Inconsistent landing pad map!");
// If some instruction between the previous try-range and this one may
// throw, create a call-site entry with no landing pad for the region
// between the try-ranges.
if (MayThrow) {
CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
CallSites.push_back(Site);
}
LastLabel = LandingPad->EndLabels[P.RangeIndex];
CallSiteEntry Site = {BeginLabel, LastLabel,
LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
"Invalid landing pad!");
// Try to merge with the previous call-site.
if (CallSites.size()) {
CallSiteEntry &Prev = CallSites[CallSites.size()-1];
if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
// Extend the range of the previous entry.
Prev.EndLabel = Site.EndLabel;
continue;
}
}
// Otherwise, create a new call-site.
CallSites.push_back(Site);
}
}
// If some instruction between the previous try-range and the end of the
// function may throw, create a call-site entry with no landing pad for the
// region following the try-range.
if (MayThrow) {
CallSiteEntry Site = {LastLabel, 0, 0, 0};
CallSites.push_back(Site);
}
// Final tallies.
unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
sizeof(int32_t) + // Site length.
sizeof(int32_t)); // Landing pad.
for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
SizeSites += Asm->SizeULEB128(CallSites[i].Action);
unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
unsigned TypeOffset = sizeof(int8_t) + // Call site format
Asm->SizeULEB128(SizeSites) + // Call-site table length
SizeSites + SizeActions + SizeTypes;
unsigned TotalSize = sizeof(int8_t) + // LPStart format
sizeof(int8_t) + // TType format
Asm->SizeULEB128(TypeOffset) + // TType base offset
TypeOffset;
unsigned SizeAlign = (4 - TotalSize) & 3;
// Begin the exception table.
Asm->SwitchToDataSection(TAI->getDwarfExceptionSection());
O << "GCC_except_table" << SubprogramCount << ":\n";
Asm->EmitAlignment(2);
for (unsigned i = 0; i != SizeAlign; ++i) {
Asm->EmitInt8(0);
Asm->EOL("Padding");
}
EmitLabel("exception", SubprogramCount);
// Emit the header.
Asm->EmitInt8(DW_EH_PE_omit);
Asm->EOL("LPStart format (DW_EH_PE_omit)");
Asm->EmitInt8(DW_EH_PE_absptr);
Asm->EOL("TType format (DW_EH_PE_absptr)");
Asm->EmitULEB128Bytes(TypeOffset);
Asm->EOL("TType base offset");
Asm->EmitInt8(DW_EH_PE_udata4);
Asm->EOL("Call site format (DW_EH_PE_udata4)");
Asm->EmitULEB128Bytes(SizeSites);
Asm->EOL("Call-site table length");
// Emit the landing pad site information.
for (unsigned i = 0; i < CallSites.size(); ++i) {
CallSiteEntry &S = CallSites[i];
const char *BeginTag;
unsigned BeginNumber;
if (!S.BeginLabel) {
BeginTag = "eh_func_begin";
BeginNumber = SubprogramCount;
} else {
BeginTag = "label";
BeginNumber = S.BeginLabel;
}
EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
false, true);
Asm->EOL("Region start");
if (!S.EndLabel) {
EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber);
} else {
EmitDifference("label", S.EndLabel, BeginTag, BeginNumber);
}
Asm->EOL("Region length");
if (!S.PadLabel) {
if (TD->getPointerSize() == sizeof(int32_t))
Asm->EmitInt32(0);
else
Asm->EmitInt64(0);
} else {
EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
false, true);
}
Asm->EOL("Landing pad");
Asm->EmitULEB128Bytes(S.Action);
Asm->EOL("Action");
}
// Emit the actions.
for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
ActionEntry &Action = Actions[I];
Asm->EmitSLEB128Bytes(Action.ValueForTypeID);
Asm->EOL("TypeInfo index");
Asm->EmitSLEB128Bytes(Action.NextAction);
Asm->EOL("Next action");
}
// Emit the type ids.
for (unsigned M = TypeInfos.size(); M; --M) {
GlobalVariable *GV = TypeInfos[M - 1];
PrintRelDirective();
if (GV)
O << Asm->getGlobalLinkName(GV);
else
O << "0";
Asm->EOL("TypeInfo");
}
// Emit the filter typeids.
for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
unsigned TypeID = FilterIds[j];
Asm->EmitULEB128Bytes(TypeID);
Asm->EOL("Filter TypeInfo index");
}
Asm->EmitAlignment(2);
}
public:
//===--------------------------------------------------------------------===//
// Main entry points.
//
DwarfException(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
: Dwarf(OS, A, T, "eh")
, shouldEmit(false)
{}
virtual ~DwarfException() {}
/// SetModuleInfo - Set machine module information when it's known that pass
/// manager has created it. Set by the target AsmPrinter.
void SetModuleInfo(MachineModuleInfo *mmi) {
MMI = mmi;
}
/// BeginModule - Emit all exception information that should come prior to the
/// content.
void BeginModule(Module *M) {
this->M = M;
}
/// EndModule - Emit all exception information that should come after the
/// content.
void EndModule() {
if (!shouldEmit) return;
const std::vector<Function *> Personalities = MMI->getPersonalities();
for (unsigned i =0; i < Personalities.size(); ++i)
EmitCommonEHFrame(Personalities[i], i);
for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
E = EHFrames.end(); I != E; ++I)
EmitEHFrame(*I);
}
/// BeginFunction - Gather pre-function exception information. Assumes being
/// emitted immediately after the function entry point.
void BeginFunction(MachineFunction *MF) {
this->MF = MF;
if (MMI &&
ExceptionHandling &&
TAI->doesSupportExceptionHandling()) {
shouldEmit = true;
// Assumes in correct section after the entry point.
EmitLabel("eh_func_begin", ++SubprogramCount);
}
}
/// EndFunction - Gather and emit post-function exception information.
///
void EndFunction() {
if (!shouldEmit) return;
EmitLabel("eh_func_end", SubprogramCount);
EmitExceptionTable();
// Save EH frame information
EHFrames.
push_back(FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF),
SubprogramCount,
MMI->getPersonalityIndex(),
MF->getFrameInfo()->hasCalls(),
!MMI->getLandingPads().empty(),
MMI->getFrameMoves()));
}
};
} // End of namespace llvm
//===----------------------------------------------------------------------===//
/// Emit - Print the abbreviation using the specified Dwarf writer.
///
void DIEAbbrev::Emit(const DwarfDebug &DD) const {
// Emit its Dwarf tag type.
DD.getAsm()->EmitULEB128Bytes(Tag);
DD.getAsm()->EOL(TagString(Tag));
// Emit whether it has children DIEs.
DD.getAsm()->EmitULEB128Bytes(ChildrenFlag);
DD.getAsm()->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.
DD.getAsm()->EmitULEB128Bytes(AttrData.getAttribute());
DD.getAsm()->EOL(AttributeString(AttrData.getAttribute()));
// Emit form type.
DD.getAsm()->EmitULEB128Bytes(AttrData.getForm());
DD.getAsm()->EOL(FormEncodingString(AttrData.getForm()));
}
// Mark end of abbreviation.
DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(1)");
DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->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(cerr); }
#endif
//===----------------------------------------------------------------------===//
#ifndef NDEBUG
void DIEValue::dump() {
print(cerr);
}
#endif
//===----------------------------------------------------------------------===//
/// EmitValue - Emit integer of appropriate size.
///
void DIEInteger::EmitValue(DwarfDebug &DD, unsigned Form) {
switch (Form) {
case DW_FORM_flag: // Fall thru
case DW_FORM_ref1: // Fall thru
case DW_FORM_data1: DD.getAsm()->EmitInt8(Integer); break;
case DW_FORM_ref2: // Fall thru
case DW_FORM_data2: DD.getAsm()->EmitInt16(Integer); break;
case DW_FORM_ref4: // Fall thru
case DW_FORM_data4: DD.getAsm()->EmitInt32(Integer); break;
case DW_FORM_ref8: // Fall thru
case DW_FORM_data8: DD.getAsm()->EmitInt64(Integer); break;
case DW_FORM_udata: DD.getAsm()->EmitULEB128Bytes(Integer); break;
case DW_FORM_sdata: DD.getAsm()->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 DwarfDebug &DD, 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 DD.getAsm()->SizeULEB128(Integer);
case DW_FORM_sdata: return DD.getAsm()->SizeSLEB128(Integer);
default: assert(0 && "DIE Value form not supported yet"); break;
}
return 0;
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit string value.
///
void DIEString::EmitValue(DwarfDebug &DD, unsigned Form) {
DD.getAsm()->EmitString(String);
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIEDwarfLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
bool IsSmall = Form == DW_FORM_data4;
DD.EmitReference(Label, false, IsSmall);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEDwarfLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
if (Form == DW_FORM_data4) return 4;
return DD.getTargetData()->getPointerSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIEObjectLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
bool IsSmall = Form == DW_FORM_data4;
DD.EmitReference(Label, false, IsSmall);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEObjectLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
if (Form == DW_FORM_data4) return 4;
return DD.getTargetData()->getPointerSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit delta value.
///
void DIEDelta::EmitValue(DwarfDebug &DD, unsigned Form) {
bool IsSmall = Form == DW_FORM_data4;
DD.EmitDifference(LabelHi, LabelLo, IsSmall);
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEDelta::SizeOf(const DwarfDebug &DD, unsigned Form) const {
if (Form == DW_FORM_data4) return 4;
return DD.getTargetData()->getPointerSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit debug information entry offset.
///
void DIEntry::EmitValue(DwarfDebug &DD, unsigned Form) {
DD.getAsm()->EmitInt32(Entry->getOffset());
}
//===----------------------------------------------------------------------===//
/// ComputeSize - calculate the size of the block.
///
unsigned DIEBlock::ComputeSize(DwarfDebug &DD) {
if (!Size) {
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
Size += Values[i]->SizeOf(DD, AbbrevData[i].getForm());
}
}
return Size;
}
/// EmitValue - Emit block data.
///
void DIEBlock::EmitValue(DwarfDebug &DD, unsigned Form) {
switch (Form) {
case DW_FORM_block1: DD.getAsm()->EmitInt8(Size); break;
case DW_FORM_block2: DD.getAsm()->EmitInt16(Size); break;
case DW_FORM_block4: DD.getAsm()->EmitInt32(Size); break;
case DW_FORM_block: DD.getAsm()->EmitULEB128Bytes(Size); break;
default: assert(0 && "Improper form for block"); break;
}
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
DD.getAsm()->EOL();
Values[i]->EmitValue(DD, AbbrevData[i].getForm());
}
}
/// SizeOf - Determine size of block data in bytes.
///
unsigned DIEBlock::SizeOf(const DwarfDebug &DD, 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 + DD.getAsm()->SizeULEB128(Size);
default: assert(0 && "Improper form for block"); break;
}
return 0;
}
//===----------------------------------------------------------------------===//
/// DIE Implementation
DIE::~DIE() {
for (unsigned i = 0, N = Children.size(); i < N; ++i)
delete Children[i];
}
/// 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);
}
/// Profile - Used to gather unique data for the value folding set.
///
void DIE::Profile(FoldingSetNodeID &ID) {
Abbrev.Profile(ID);
for (unsigned i = 0, N = Children.size(); i < N; ++i)
ID.AddPointer(Children[i]);
for (unsigned j = 0, M = Values.size(); j < M; ++j)
ID.AddPointer(Values[j]);
}
#ifndef NDEBUG
void DIE::print(std::ostream &O, unsigned IncIndent) {
static unsigned IndentCount = 0;
IndentCount += IncIndent;
const std::string Indent(IndentCount, ' ');
bool isBlock = Abbrev.getTag() == 0;
if (!isBlock) {
O << Indent
<< "Die: "
<< "0x" << std::hex << (intptr_t)this << std::dec
<< ", Offset: " << Offset
<< ", Size: " << Size
<< "\n";
O << Indent
<< TagString(Abbrev.getTag())
<< " "
<< ChildrenString(Abbrev.getChildrenFlag());
} else {
O << "Size: " << Size;
}
O << "\n";
const std::vector<DIEAbbrevData> &Data = Abbrev.getData();
IndentCount += 2;
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
O << Indent;
if (!isBlock) {
O << AttributeString(Data[i].getAttribute());
} else {
O << "Blk[" << i << "]";
}
O << " "
<< FormEncodingString(Data[i].getForm())
<< " ";
Values[i]->print(O);
O << "\n";
}
IndentCount -= 2;
for (unsigned j = 0, M = Children.size(); j < M; ++j) {
Children[j]->print(O, 4);
}
if (!isBlock) O << "\n";
IndentCount -= IncIndent;
}
void DIE::dump() {
print(cerr);
}
#endif
//===----------------------------------------------------------------------===//
/// DwarfWriter Implementation
///
DwarfWriter::DwarfWriter(std::ostream &OS, AsmPrinter *A,
const TargetAsmInfo *T) {
DE = new DwarfException(OS, A, T);
DD = new DwarfDebug(OS, A, T);
}
DwarfWriter::~DwarfWriter() {
delete DE;
delete DD;
}
/// SetModuleInfo - Set machine module info when it's known that pass manager
/// has created it. Set by the target AsmPrinter.
void DwarfWriter::SetModuleInfo(MachineModuleInfo *MMI) {
DD->SetModuleInfo(MMI);
DE->SetModuleInfo(MMI);
}
/// BeginModule - Emit all Dwarf sections that should come prior to the
/// content.
void DwarfWriter::BeginModule(Module *M) {
DE->BeginModule(M);
DD->BeginModule(M);
}
/// EndModule - Emit all Dwarf sections that should come after the content.
///
void DwarfWriter::EndModule() {
DE->EndModule();
DD->EndModule();
}
/// BeginFunction - Gather pre-function debug information. Assumes being
/// emitted immediately after the function entry point.
void DwarfWriter::BeginFunction(MachineFunction *MF) {
DE->BeginFunction(MF);
DD->BeginFunction(MF);
}
/// EndFunction - Gather and emit post-function debug information.
///
void DwarfWriter::EndFunction() {
DD->EndFunction();
DE->EndFunction();
if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI()) {
// Clear function debug information.
MMI->EndFunction();
}
}
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