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llvm-mirror/lib/CodeGen/DwarfWriter.cpp
Jim Laskey c73a56236e Switch back to using actual dwarf tags. Simplifies code without loss to other 
debug forms.

llvm-svn: 26455
2006-03-01 20:39:36 +00:00

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//===-- llvm/CodeGen/DwarfWriter.cpp - Dwarf Framework ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by James M. Laskey and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing dwarf debug info into asm files.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineDebugInfo.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Target/TargetMachine.h"
#include <iostream>
using namespace llvm;
using namespace llvm::dwarf;
static cl::opt<bool>
DwarfVerbose("dwarf-verbose", cl::Hidden,
cl::desc("Add comments to Dwarf directives."));
namespace llvm {
//===----------------------------------------------------------------------===//
// Forward declarations.
//
class CompileUnit;
class DIE;
//===----------------------------------------------------------------------===//
class CompileUnit {
private:
CompileUnitDesc *Desc; // Compile unit debug descriptor.
unsigned ID; // File ID for source.
DIE *Die; // Compile unit die.
std::map<std::string, DIE *> Globals; // A map of globally visible named
// entities for this unit.
public:
CompileUnit(CompileUnitDesc *CUD, unsigned I, DIE *D)
: Desc(CUD)
, ID(I)
, Die(D)
, Globals()
{}
~CompileUnit();
// Accessors.
CompileUnitDesc *getDesc() const { return Desc; }
unsigned getID() const { return ID; }
DIE* getDie() const { return Die; }
std::map<std::string, DIE *> &getGlobals() { return Globals; }
/// hasContent - Return true if this compile unit has something to write out.
///
bool hasContent() const;
/// AddGlobal - Add a new global entity to the compile unit.
///
void AddGlobal(const std::string &Name, DIE *Die);
};
//===----------------------------------------------------------------------===//
// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
// Dwarf abbreviation.
class DIEAbbrevData {
private:
unsigned Attribute; // Dwarf attribute code.
unsigned Form; // Dwarf form code.
public:
DIEAbbrevData(unsigned A, unsigned F)
: Attribute(A)
, Form(F)
{}
// Accessors.
unsigned getAttribute() const { return Attribute; }
unsigned getForm() const { return Form; }
/// operator== - Used by DIEAbbrev to locate entry.
///
bool operator==(const DIEAbbrevData &DAD) const {
return Attribute == DAD.Attribute && Form == DAD.Form;
}
/// operator!= - Used by DIEAbbrev to locate entry.
///
bool operator!=(const DIEAbbrevData &DAD) const {
return Attribute != DAD.Attribute || Form != DAD.Form;
}
/// operator< - Used by DIEAbbrev to locate entry.
///
bool operator<(const DIEAbbrevData &DAD) const {
return Attribute < DAD.Attribute ||
(Attribute == DAD.Attribute && Form < DAD.Form);
}
};
//===----------------------------------------------------------------------===//
// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
// information object.
class DIEAbbrev {
private:
unsigned Tag; // Dwarf tag code.
unsigned ChildrenFlag; // Dwarf children flag.
std::vector<DIEAbbrevData> Data; // Raw data bytes for abbreviation.
public:
DIEAbbrev(unsigned T, unsigned C)
: Tag(T)
, ChildrenFlag(C)
, Data()
{}
~DIEAbbrev() {}
// Accessors.
unsigned getTag() const { return Tag; }
unsigned getChildrenFlag() const { return ChildrenFlag; }
const std::vector<DIEAbbrevData> &getData() const { return Data; }
void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
/// operator== - Used by UniqueVector to locate entry.
///
bool operator==(const DIEAbbrev &DA) const;
/// operator< - Used by UniqueVector to locate entry.
///
bool operator<(const DIEAbbrev &DA) const;
/// AddAttribute - Adds another set of attribute information to the
/// abbreviation.
void AddAttribute(unsigned Attribute, unsigned Form) {
Data.push_back(DIEAbbrevData(Attribute, Form));
}
/// Emit - Print the abbreviation using the specified Dwarf writer.
///
void Emit(const DwarfWriter &DW) const;
#ifndef NDEBUG
void print(std::ostream &O);
void dump();
#endif
};
//===----------------------------------------------------------------------===//
// DIEValue - A debug information entry value.
//
class DIEValue {
public:
enum {
isInteger,
isString,
isLabel,
isAsIsLabel,
isDelta,
isEntry
};
unsigned Type; // Type of the value
DIEValue(unsigned T) : Type(T) {}
virtual ~DIEValue() {}
// Implement isa/cast/dyncast.
static bool classof(const DIEValue *) { return true; }
/// EmitValue - Emit value via the Dwarf writer.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const = 0;
/// SizeOf - Return the size of a value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const = 0;
};
//===----------------------------------------------------------------------===//
// DWInteger - An integer value DIE.
//
class DIEInteger : public DIEValue {
private:
uint64_t Integer;
public:
DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEInteger *) { return true; }
static bool classof(const DIEValue *I) { return I->Type == isInteger; }
/// EmitValue - Emit integer of appropriate size.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const;
/// SizeOf - Determine size of integer value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
// DIEString - A string value DIE.
//
struct DIEString : public DIEValue {
const std::string String;
DIEString(const std::string &S) : DIEValue(isString), String(S) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEString *) { return true; }
static bool classof(const DIEValue *S) { return S->Type == isString; }
/// EmitValue - Emit string value.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const;
/// SizeOf - Determine size of string value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
// DIEDwarfLabel - A Dwarf internal label expression DIE.
//
struct DIEDwarfLabel : public DIEValue {
const DWLabel Label;
DIEDwarfLabel(const DWLabel &L) : DIEValue(isLabel), Label(L) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEDwarfLabel *) { return true; }
static bool classof(const DIEValue *L) { return L->Type == isLabel; }
/// EmitValue - Emit label value.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const;
/// SizeOf - Determine size of label value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
// DIEObjectLabel - A label to an object in code or data.
//
struct DIEObjectLabel : public DIEValue {
const std::string Label;
DIEObjectLabel(const std::string &L) : DIEValue(isAsIsLabel), Label(L) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEObjectLabel *) { return true; }
static bool classof(const DIEValue *L) { return L->Type == isAsIsLabel; }
/// EmitValue - Emit label value.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const;
/// SizeOf - Determine size of label value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
// DIEDelta - A simple label difference DIE.
//
struct DIEDelta : public DIEValue {
const DWLabel LabelHi;
const DWLabel LabelLo;
DIEDelta(const DWLabel &Hi, const DWLabel &Lo)
: DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEDelta *) { return true; }
static bool classof(const DIEValue *D) { return D->Type == isDelta; }
/// EmitValue - Emit delta value.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const;
/// SizeOf - Determine size of delta value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
// DIEntry - A pointer to a debug information entry.
//
struct DIEntry : public DIEValue {
DIE *Entry;
DIEntry(DIE *E) : DIEValue(isEntry), Entry(E) {}
// Implement isa/cast/dyncast.
static bool classof(const DIEntry *) { return true; }
static bool classof(const DIEValue *E) { return E->Type == isEntry; }
/// EmitValue - Emit delta value.
///
virtual void EmitValue(const DwarfWriter &DW, unsigned Form) const;
/// SizeOf - Determine size of delta value in bytes.
///
virtual unsigned SizeOf(const DwarfWriter &DW, unsigned Form) const;
};
//===----------------------------------------------------------------------===//
// DIE - A structured debug information entry. Has an abbreviation which
// describes it's organization.
class DIE {
private:
DIEAbbrev *Abbrev; // Temporary buffer for abbreviation.
unsigned AbbrevID; // Decribing abbreviation ID.
unsigned Offset; // Offset in debug info section.
unsigned Size; // Size of instance + children.
std::vector<DIE *> Children; // Children DIEs.
std::vector<DIEValue *> Values; // Attributes values.
public:
DIE(unsigned Tag);
~DIE();
// Accessors.
unsigned getAbbrevID() const { return AbbrevID; }
unsigned getOffset() const { return Offset; }
unsigned getSize() const { return Size; }
const std::vector<DIE *> &getChildren() const { return Children; }
const std::vector<DIEValue *> &getValues() const { return Values; }
void setOffset(unsigned O) { Offset = O; }
void setSize(unsigned S) { Size = S; }
/// SiblingOffset - Return the offset of the debug information entry's
/// sibling.
unsigned SiblingOffset() const { return Offset + Size; }
/// AddUInt - Add an unsigned integer attribute data and value.
///
void AddUInt(unsigned Attribute, unsigned Form, uint64_t Integer);
/// AddSInt - Add an signed integer attribute data and value.
///
void AddSInt(unsigned Attribute, unsigned Form, int64_t Integer);
/// AddString - Add a std::string attribute data and value.
///
void AddString(unsigned Attribute, unsigned Form,
const std::string &String);
/// AddLabel - Add a Dwarf label attribute data and value.
///
void AddLabel(unsigned Attribute, unsigned Form, const DWLabel &Label);
/// AddObjectLabel - Add a non-Dwarf label attribute data and value.
///
void AddObjectLabel(unsigned Attribute, unsigned Form,
const std::string &Label);
/// AddDelta - Add a label delta attribute data and value.
///
void AddDelta(unsigned Attribute, unsigned Form,
const DWLabel &Hi, const DWLabel &Lo);
/// AddDIEntry - Add a DIE attribute data and value.
///
void AddDIEntry(unsigned Attribute, unsigned Form, DIE *Entry);
/// Complete - Indicate that all attributes have been added and
/// ready to get an abbreviation ID.
///
void Complete(DwarfWriter &DW);
/// AddChild - Add a child to the DIE.
void AddChild(DIE *Child);
};
} // End of namespace llvm
//===----------------------------------------------------------------------===//
CompileUnit::~CompileUnit() {
delete Die;
}
/// hasContent - Return true if this compile unit has something to write out.
///
bool CompileUnit::hasContent() const {
return !Die->getChildren().empty();
}
/// AddGlobal - Add a new global entity to the compile unit.
///
void CompileUnit::AddGlobal(const std::string &Name, DIE *Die) {
Globals[Name] = Die;
}
//===----------------------------------------------------------------------===//
/// operator== - Used by UniqueVector to locate entry.
///
bool DIEAbbrev::operator==(const DIEAbbrev &DA) const {
if (Tag != DA.Tag) return false;
if (ChildrenFlag != DA.ChildrenFlag) return false;
if (Data.size() != DA.Data.size()) return false;
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
if (Data[i] != DA.Data[i]) return false;
}
return true;
}
/// operator< - Used by UniqueVector to locate entry.
///
bool DIEAbbrev::operator<(const DIEAbbrev &DA) const {
if (Tag != DA.Tag) return Tag < DA.Tag;
if (ChildrenFlag != DA.ChildrenFlag) return ChildrenFlag < DA.ChildrenFlag;
if (Data.size() != DA.Data.size()) return Data.size() < DA.Data.size();
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
if (Data[i] != DA.Data[i]) return Data[i] < DA.Data[i];
}
return false;
}
/// Emit - Print the abbreviation using the specified Dwarf writer.
///
void DIEAbbrev::Emit(const DwarfWriter &DW) const {
// Emit its Dwarf tag type.
DW.EmitULEB128Bytes(Tag);
DW.EOL(TagString(Tag));
// Emit whether it has children DIEs.
DW.EmitULEB128Bytes(ChildrenFlag);
DW.EOL(ChildrenString(ChildrenFlag));
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
const DIEAbbrevData &AttrData = Data[i];
// Emit attribute type.
DW.EmitULEB128Bytes(AttrData.getAttribute());
DW.EOL(AttributeString(AttrData.getAttribute()));
// Emit form type.
DW.EmitULEB128Bytes(AttrData.getForm());
DW.EOL(FormEncodingString(AttrData.getForm()));
}
// Mark end of abbreviation.
DW.EmitULEB128Bytes(0); DW.EOL("EOM(1)");
DW.EmitULEB128Bytes(0); DW.EOL("EOM(2)");
}
#ifndef NDEBUG
void DIEAbbrev::print(std::ostream &O) {
O << "Abbreviation @"
<< std::hex << (intptr_t)this << std::dec
<< " "
<< TagString(Tag)
<< " "
<< ChildrenString(ChildrenFlag)
<< "\n";
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
O << " "
<< AttributeString(Data[i].getAttribute())
<< " "
<< FormEncodingString(Data[i].getForm())
<< "\n";
}
}
void DIEAbbrev::dump() { print(std::cerr); }
#endif
//===----------------------------------------------------------------------===//
/// EmitValue - Emit integer of appropriate size.
///
void DIEInteger::EmitValue(const DwarfWriter &DW, unsigned Form) const {
switch (Form) {
case DW_FORM_flag: // Fall thru
case DW_FORM_data1: DW.EmitInt8(Integer); break;
case DW_FORM_data2: DW.EmitInt16(Integer); break;
case DW_FORM_data4: DW.EmitInt32(Integer); break;
case DW_FORM_data8: DW.EmitInt64(Integer); break;
case DW_FORM_udata: DW.EmitULEB128Bytes(Integer); break;
case DW_FORM_sdata: DW.EmitSLEB128Bytes(Integer); break;
default: assert(0 && "DIE Value form not supported yet"); break;
}
}
/// SizeOf - Determine size of integer value in bytes.
///
unsigned DIEInteger::SizeOf(const DwarfWriter &DW, unsigned Form) const {
switch (Form) {
case DW_FORM_flag: // Fall thru
case DW_FORM_data1: return sizeof(int8_t);
case DW_FORM_data2: return sizeof(int16_t);
case DW_FORM_data4: return sizeof(int32_t);
case DW_FORM_data8: return sizeof(int64_t);
case DW_FORM_udata: return DW.SizeULEB128(Integer);
case DW_FORM_sdata: return DW.SizeSLEB128(Integer);
default: assert(0 && "DIE Value form not supported yet"); break;
}
return 0;
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit string value.
///
void DIEString::EmitValue(const DwarfWriter &DW, unsigned Form) const {
DW.EmitString(String);
}
/// SizeOf - Determine size of string value in bytes.
///
unsigned DIEString::SizeOf(const DwarfWriter &DW, unsigned Form) const {
return String.size() + sizeof(char); // sizeof('\0');
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIEDwarfLabel::EmitValue(const DwarfWriter &DW, unsigned Form) const {
DW.EmitReference(Label);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEDwarfLabel::SizeOf(const DwarfWriter &DW, unsigned Form) const {
return DW.getAddressSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIEObjectLabel::EmitValue(const DwarfWriter &DW, unsigned Form) const {
DW.EmitInt8(sizeof(int8_t) + DW.getAddressSize());
DW.EOL("DW_FORM_block1 length");
DW.EmitInt8(DW_OP_addr);
DW.EOL("DW_OP_addr");
DW.EmitReference(Label);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEObjectLabel::SizeOf(const DwarfWriter &DW, unsigned Form) const {
return sizeof(int8_t) + sizeof(int8_t) + DW.getAddressSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit delta value.
///
void DIEDelta::EmitValue(const DwarfWriter &DW, unsigned Form) const {
DW.EmitDifference(LabelHi, LabelLo);
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEDelta::SizeOf(const DwarfWriter &DW, unsigned Form) const {
return DW.getAddressSize();
}
//===----------------------------------------------------------------------===//
/// EmitValue - Emit extry offset.
///
void DIEntry::EmitValue(const DwarfWriter &DW, unsigned Form) const {
DW.EmitInt32(Entry->getOffset());
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIEntry::SizeOf(const DwarfWriter &DW, unsigned Form) const {
return sizeof(int32_t);
}
//===----------------------------------------------------------------------===//
DIE::DIE(unsigned Tag)
: Abbrev(new DIEAbbrev(Tag, DW_CHILDREN_no))
, AbbrevID(0)
, Offset(0)
, Size(0)
, Children()
, Values()
{}
DIE::~DIE() {
if (Abbrev) delete Abbrev;
for (unsigned i = 0, N = Children.size(); i < N; ++i) {
delete Children[i];
}
for (unsigned j = 0, M = Values.size(); j < M; ++j) {
delete Values[j];
}
}
/// AddUInt - Add an unsigned integer attribute data and value.
///
void DIE::AddUInt(unsigned Attribute, unsigned Form, uint64_t Integer) {
if (Form == 0) {
if ((unsigned char)Integer == Integer) Form = DW_FORM_data1;
else if ((unsigned short)Integer == Integer) Form = DW_FORM_data2;
else if ((unsigned int)Integer == Integer) Form = DW_FORM_data4;
else Form = DW_FORM_data8;
}
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEInteger(Integer));
}
/// AddSInt - Add an signed integer attribute data and value.
///
void DIE::AddSInt(unsigned Attribute, unsigned Form, int64_t Integer) {
if (Form == 0) {
if ((char)Integer == Integer) Form = DW_FORM_data1;
else if ((short)Integer == Integer) Form = DW_FORM_data2;
else if ((int)Integer == Integer) Form = DW_FORM_data4;
else Form = DW_FORM_data8;
}
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEInteger(Integer));
}
/// AddString - Add a std::string attribute data and value.
///
void DIE::AddString(unsigned Attribute, unsigned Form,
const std::string &String) {
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEString(String));
}
/// AddLabel - Add a Dwarf label attribute data and value.
///
void DIE::AddLabel(unsigned Attribute, unsigned Form,
const DWLabel &Label) {
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEDwarfLabel(Label));
}
/// AddObjectLabel - Add an non-Dwarf label attribute data and value.
///
void DIE::AddObjectLabel(unsigned Attribute, unsigned Form,
const std::string &Label) {
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEObjectLabel(Label));
}
/// AddDelta - Add a label delta attribute data and value.
///
void DIE::AddDelta(unsigned Attribute, unsigned Form,
const DWLabel &Hi, const DWLabel &Lo) {
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEDelta(Hi, Lo));
}
/// AddDIEntry - Add a DIE attribute data and value.
///
void DIE::AddDIEntry(unsigned Attribute,
unsigned Form, DIE *Entry) {
Abbrev->AddAttribute(Attribute, Form);
Values.push_back(new DIEntry(Entry));
}
/// Complete - Indicate that all attributes have been added and ready to get an
/// abbreviation ID.
void DIE::Complete(DwarfWriter &DW) {
AbbrevID = DW.NewAbbreviation(Abbrev);
delete Abbrev;
Abbrev = NULL;
}
/// AddChild - Add a child to the DIE.
///
void DIE::AddChild(DIE *Child) {
assert(Abbrev && "Adding children without an abbreviation");
Abbrev->setChildrenFlag(DW_CHILDREN_yes);
Children.push_back(Child);
}
//===----------------------------------------------------------------------===//
/// DWContext
//===----------------------------------------------------------------------===//
/// PrintHex - Print a value as a hexidecimal value.
///
void DwarfWriter::PrintHex(int Value) const {
O << "0x" << std::hex << Value << std::dec;
}
/// EOL - Print a newline character to asm stream. If a comment is present
/// then it will be printed first. Comments should not contain '\n'.
void DwarfWriter::EOL(const std::string &Comment) const {
if (DwarfVerbose) {
O << "\t"
<< Asm->CommentString
<< " "
<< Comment;
}
O << "\n";
}
/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
/// unsigned leb128 value.
void DwarfWriter::EmitULEB128Bytes(unsigned Value) const {
if (hasLEB128) {
O << "\t.uleb128\t"
<< Value;
} else {
O << Asm->Data8bitsDirective;
PrintULEB128(Value);
}
}
/// EmitSLEB128Bytes - Emit an assembler byte data directive to compose a
/// signed leb128 value.
void DwarfWriter::EmitSLEB128Bytes(int Value) const {
if (hasLEB128) {
O << "\t.sleb128\t"
<< Value;
} else {
O << Asm->Data8bitsDirective;
PrintSLEB128(Value);
}
}
/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
/// representing an unsigned leb128 value.
void DwarfWriter::PrintULEB128(unsigned Value) const {
do {
unsigned Byte = Value & 0x7f;
Value >>= 7;
if (Value) Byte |= 0x80;
PrintHex(Byte);
if (Value) O << ", ";
} while (Value);
}
/// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
/// value.
unsigned DwarfWriter::SizeULEB128(unsigned Value) {
unsigned Size = 0;
do {
Value >>= 7;
Size += sizeof(int8_t);
} while (Value);
return Size;
}
/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
/// representing a signed leb128 value.
void DwarfWriter::PrintSLEB128(int Value) const {
int Sign = Value >> (8 * sizeof(Value) - 1);
bool IsMore;
do {
unsigned Byte = Value & 0x7f;
Value >>= 7;
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
if (IsMore) Byte |= 0x80;
PrintHex(Byte);
if (IsMore) O << ", ";
} while (IsMore);
}
/// SizeSLEB128 - Compute the number of bytes required for a signed leb128
/// value.
unsigned DwarfWriter::SizeSLEB128(int Value) {
unsigned Size = 0;
int Sign = Value >> (8 * sizeof(Value) - 1);
bool IsMore;
do {
unsigned Byte = Value & 0x7f;
Value >>= 7;
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
Size += sizeof(int8_t);
} while (IsMore);
return Size;
}
/// EmitInt8 - Emit a byte directive and value.
///
void DwarfWriter::EmitInt8(int Value) const {
O << Asm->Data8bitsDirective;
PrintHex(Value & 0xFF);
}
/// EmitInt16 - Emit a short directive and value.
///
void DwarfWriter::EmitInt16(int Value) const {
O << Asm->Data16bitsDirective;
PrintHex(Value & 0xFFFF);
}
/// EmitInt32 - Emit a long directive and value.
///
void DwarfWriter::EmitInt32(int Value) const {
O << Asm->Data32bitsDirective;
PrintHex(Value);
}
/// EmitInt64 - Emit a long long directive and value.
///
void DwarfWriter::EmitInt64(uint64_t Value) const {
if (Asm->Data64bitsDirective) {
O << Asm->Data64bitsDirective << "0x" << std::hex << Value << std::dec;
} else {
const TargetData &TD = Asm->TM.getTargetData();
if (TD.isBigEndian()) {
EmitInt32(unsigned(Value >> 32)); O << "\n";
EmitInt32(unsigned(Value));
} else {
EmitInt32(unsigned(Value)); O << "\n";
EmitInt32(unsigned(Value >> 32));
}
}
}
/// EmitString - Emit a string with quotes and a null terminator.
/// Special characters are emitted properly. (Eg. '\t')
void DwarfWriter::EmitString(const std::string &String) const {
O << Asm->AsciiDirective
<< "\"";
for (unsigned i = 0, N = String.size(); i < N; ++i) {
unsigned char C = String[i];
if (!isascii(C) || iscntrl(C)) {
switch(C) {
case '\b': O << "\\b"; break;
case '\f': O << "\\f"; break;
case '\n': O << "\\n"; break;
case '\r': O << "\\r"; break;
case '\t': O << "\\t"; break;
default:
O << '\\';
O << char('0' + (C >> 6));
O << char('0' + (C >> 3));
O << char('0' + (C >> 0));
break;
}
} else if (C == '\"') {
O << "\\\"";
} else if (C == '\'') {
O << "\\\'";
} else {
O << C;
}
}
O << "\\0\"";
}
/// PrintLabelName - Print label name in form used by Dwarf writer.
///
void DwarfWriter::PrintLabelName(const char *Tag, unsigned Number) const {
O << Asm->PrivateGlobalPrefix
<< "debug_"
<< Tag;
if (Number) O << Number;
}
/// EmitLabel - Emit location label for internal use by Dwarf.
///
void DwarfWriter::EmitLabel(const char *Tag, unsigned Number) const {
PrintLabelName(Tag, Number);
O << ":\n";
}
/// EmitReference - Emit a reference to a label.
///
void DwarfWriter::EmitReference(const char *Tag, unsigned Number) const {
if (AddressSize == 4)
O << Asm->Data32bitsDirective;
else
O << Asm->Data64bitsDirective;
PrintLabelName(Tag, Number);
}
void DwarfWriter::EmitReference(const std::string &Name) const {
if (AddressSize == 4)
O << Asm->Data32bitsDirective;
else
O << Asm->Data64bitsDirective;
O << Name;
}
/// EmitDifference - Emit an label difference as sizeof(pointer) value. Some
/// assemblers do not accept absolute expressions with data directives, so there
/// is an option (needsSet) to use an intermediary 'set' expression.
void DwarfWriter::EmitDifference(const char *TagHi, unsigned NumberHi,
const char *TagLo, unsigned NumberLo) const {
if (needsSet) {
static unsigned SetCounter = 0;
O << "\t.set\t";
PrintLabelName("set", SetCounter);
O << ",";
PrintLabelName(TagHi, NumberHi);
O << "-";
PrintLabelName(TagLo, NumberLo);
O << "\n";
if (AddressSize == sizeof(int32_t))
O << Asm->Data32bitsDirective;
else
O << Asm->Data64bitsDirective;
PrintLabelName("set", SetCounter);
++SetCounter;
} else {
if (AddressSize == sizeof(int32_t))
O << Asm->Data32bitsDirective;
else
O << Asm->Data64bitsDirective;
PrintLabelName(TagHi, NumberHi);
O << "-";
PrintLabelName(TagLo, NumberLo);
}
}
/// NewAbbreviation - Add the abbreviation to the Abbreviation vector.
///
unsigned DwarfWriter::NewAbbreviation(DIEAbbrev *Abbrev) {
return Abbreviations.insert(*Abbrev);
}
/// NewString - Add a string to the constant pool and returns a label.
///
DWLabel DwarfWriter::NewString(const std::string &String) {
unsigned StringID = StringPool.insert(String);
return DWLabel("string", StringID);
}
/// NewBasicType - Creates a new basic type if necessary, then adds to the
/// owner.
/// FIXME - Should never be needed.
DIE *DwarfWriter::NewBasicType(DIE *Context, Type *Ty) {
DIE *&Slot = TypeToDieMap[Ty];
if (Slot) return Slot;
const char *Name;
unsigned Size;
unsigned Encoding = 0;
switch (Ty->getTypeID()) {
case Type::UByteTyID:
Name = "unsigned char";
Size = 1;
Encoding = DW_ATE_unsigned_char;
break;
case Type::SByteTyID:
Name = "char";
Size = 1;
Encoding = DW_ATE_signed_char;
break;
case Type::UShortTyID:
Name = "unsigned short";
Size = 2;
Encoding = DW_ATE_unsigned;
break;
case Type::ShortTyID:
Name = "short";
Size = 2;
Encoding = DW_ATE_signed;
break;
case Type::UIntTyID:
Name = "unsigned int";
Size = 4;
Encoding = DW_ATE_unsigned;
break;
case Type::IntTyID:
Name = "int";
Size = 4;
Encoding = DW_ATE_signed;
break;
case Type::ULongTyID:
Name = "unsigned long long";
Size = 7;
Encoding = DW_ATE_unsigned;
break;
case Type::LongTyID:
Name = "long long";
Size = 7;
Encoding = DW_ATE_signed;
break;
case Type::FloatTyID:
Name = "float";
Size = 4;
Encoding = DW_ATE_float;
break;
case Type::DoubleTyID:
Name = "double";
Size = 8;
Encoding = DW_ATE_float;
break;
default:
// FIXME - handle more complex types.
Name = "unknown";
Size = 1;
Encoding = DW_ATE_address;
break;
}
// construct the type DIE.
Slot = new DIE(DW_TAG_base_type);
Slot->AddString(DW_AT_name, DW_FORM_string, Name);
Slot->AddUInt (DW_AT_byte_size, 0, Size);
Slot->AddUInt (DW_AT_encoding, DW_FORM_data1, Encoding);
// Add to context.
Context->AddChild(Slot);
return Slot;
}
/// NewType - Create a new type DIE.
///
DIE *DwarfWriter::NewType(DIE *Context, TypeDesc *TyDesc) {
// FIXME - hack to get around NULL types short term.
if (!TyDesc) return NewBasicType(Context, Type::IntTy);
// FIXME - Should handle other contexts that compile units.
// Check for pre-existence.
DIE *&Slot = DescToDieMap[TyDesc];
if (Slot) return Slot;
// Get core information.
const std::string &Name = TyDesc->getName();
uint64_t Size = TyDesc->getSize() >> 3;
DIE *Ty = NULL;
if (BasicTypeDesc *BasicTy = dyn_cast<BasicTypeDesc>(TyDesc)) {
// Fundamental types like int, float, bool
Slot = Ty = new DIE(DW_TAG_base_type);
unsigned Encoding = BasicTy->getEncoding();
Ty->AddUInt (DW_AT_encoding, DW_FORM_data1, Encoding);
} else if (DerivedTypeDesc *DerivedTy = dyn_cast<DerivedTypeDesc>(TyDesc)) {
// Create specific DIE.
Slot = Ty = new DIE(DerivedTy->getTag());
// Map to main type, void will not have a type.
if (TypeDesc *FromTy = DerivedTy->getFromType()) {
Ty->AddDIEntry(DW_AT_type, DW_FORM_ref4, NewType(Context, FromTy));
}
} else if (CompositeTypeDesc *CompTy = dyn_cast<CompositeTypeDesc>(TyDesc)) {
// Create specific DIE.
Slot = Ty = new DIE(CompTy->getTag());
std::vector<DebugInfoDesc *> &Elements = CompTy->getElements();
switch (CompTy->getTag()) {
case DW_TAG_array_type: {
// Add element type.
if (TypeDesc *FromTy = CompTy->getFromType()) {
Ty->AddDIEntry(DW_AT_type, DW_FORM_ref4, NewType(Context, FromTy));
}
// Don't emit size attribute.
Size = 0;
// Construct an anonymous type for index type.
DIE *IndexTy = new DIE(DW_TAG_base_type);
IndexTy->AddUInt(DW_AT_byte_size, 0, 4);
IndexTy->AddUInt(DW_AT_encoding, DW_FORM_data1, DW_ATE_signed);
// Add to context.
Context->AddChild(IndexTy);
// Add subranges to array type.
for(unsigned i = 0, N = Elements.size(); i < N; ++i) {
SubrangeDesc *SRD = cast<SubrangeDesc>(Elements[i]);
int64_t Lo = SRD->getLo();
int64_t Hi = SRD->getHi();
DIE *Subrange = new DIE(DW_TAG_subrange_type);
// If a range is available.
if (Lo != Hi) {
Subrange->AddDIEntry(DW_AT_type, DW_FORM_ref4, IndexTy);
// Only add low if non-zero.
if (Lo) Subrange->AddUInt(DW_AT_lower_bound, 0, Lo);
Subrange->AddUInt(DW_AT_upper_bound, 0, Hi);
}
Ty->AddChild(Subrange);
}
break;
}
case DW_TAG_structure_type: {
break;
}
case DW_TAG_union_type: {
break;
}
case DW_TAG_enumeration_type: {
break;
}
default: break;
}
}
assert(Ty && "Type not supported yet");
// Add size if non-zero (derived types don't have a size.)
if (Size) Ty->AddUInt(DW_AT_byte_size, 0, Size);
// Add name if not anonymous or intermediate type.
if (!Name.empty()) Ty->AddString(DW_AT_name, DW_FORM_string, Name);
// Add source line info if present.
if (CompileUnitDesc *File = TyDesc->getFile()) {
CompileUnit *FileUnit = FindCompileUnit(File);
unsigned FileID = FileUnit->getID();
int Line = TyDesc->getLine();
Ty->AddUInt(DW_AT_decl_file, 0, FileID);
Ty->AddUInt(DW_AT_decl_line, 0, Line);
}
// Add to context owner.
Context->AddChild(Ty);
return Slot;
}
/// NewCompileUnit - Create new compile unit and it's die.
///
CompileUnit *DwarfWriter::NewCompileUnit(CompileUnitDesc *UnitDesc,
unsigned ID) {
// Construct debug information entry.
DIE *Die = new DIE(DW_TAG_compile_unit);
Die->AddLabel (DW_AT_stmt_list, DW_FORM_data4, DWLabel("line", 0));
Die->AddLabel (DW_AT_high_pc, DW_FORM_addr, DWLabel("text_end", 0));
Die->AddLabel (DW_AT_low_pc, DW_FORM_addr, DWLabel("text_begin", 0));
Die->AddString(DW_AT_producer, DW_FORM_string, UnitDesc->getProducer());
Die->AddUInt (DW_AT_language, DW_FORM_data1, UnitDesc->getLanguage());
Die->AddString(DW_AT_name, DW_FORM_string, UnitDesc->getFileName());
Die->AddString(DW_AT_comp_dir, DW_FORM_string, UnitDesc->getDirectory());
// Add die to descriptor map.
DescToDieMap[UnitDesc] = Die;
// Construct compile unit.
CompileUnit *Unit = new CompileUnit(UnitDesc, ID, Die);
// Add Unit to compile unit map.
DescToUnitMap[UnitDesc] = Unit;
return Unit;
}
/// FindCompileUnit - Get the compile unit for the given descriptor.
///
CompileUnit *DwarfWriter::FindCompileUnit(CompileUnitDesc *UnitDesc) {
CompileUnit *Unit = DescToUnitMap[UnitDesc];
assert(Unit && "Missing compile unit.");
return Unit;
}
/// NewGlobalVariable - Add a new global variable DIE.
///
DIE *DwarfWriter::NewGlobalVariable(GlobalVariableDesc *GVD) {
// Check for pre-existence.
DIE *&Slot = DescToDieMap[GVD];
if (Slot) return Slot;
// Get the compile unit context.
CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(GVD->getContext());
CompileUnit *Unit = FindCompileUnit(UnitDesc);
// Get the global variable itself.
GlobalVariable *GV = GVD->getGlobalVariable();
// Generate the mangled name.
std::string MangledName = Asm->Mang->getValueName(GV);
// Gather the details (simplify add attribute code.)
const std::string &Name = GVD->getName();
unsigned FileID = Unit->getID();
unsigned Line = GVD->getLine();
// Get the global's type.
DIE *Type = NewType(Unit->getDie(), GVD->getTypeDesc());
// Create the globale variable DIE.
DIE *VariableDie = new DIE(DW_TAG_variable);
VariableDie->AddString (DW_AT_name, DW_FORM_string, Name);
VariableDie->AddUInt (DW_AT_decl_file, 0, FileID);
VariableDie->AddUInt (DW_AT_decl_line, 0, Line);
VariableDie->AddDIEntry (DW_AT_type, DW_FORM_ref4, Type);
VariableDie->AddUInt (DW_AT_external, DW_FORM_flag, 1);
// FIXME - needs to be a proper expression.
VariableDie->AddObjectLabel(DW_AT_location, DW_FORM_block1, MangledName);
// Add to map.
Slot = VariableDie;
// Add to context owner.
Unit->getDie()->AddChild(VariableDie);
// Expose as global.
// FIXME - need to check external flag.
Unit->AddGlobal(Name, VariableDie);
return VariableDie;
}
/// NewSubprogram - Add a new subprogram DIE.
///
DIE *DwarfWriter::NewSubprogram(SubprogramDesc *SPD) {
// Check for pre-existence.
DIE *&Slot = DescToDieMap[SPD];
if (Slot) return Slot;
// Get the compile unit context.
CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(SPD->getContext());
CompileUnit *Unit = FindCompileUnit(UnitDesc);
// Gather the details (simplify add attribute code.)
const std::string &Name = SPD->getName();
unsigned FileID = Unit->getID();
// FIXME - faking the line for the time being.
unsigned Line = 1;
// FIXME - faking the type for the time being.
DIE *Type = NewBasicType(Unit->getDie(), Type::IntTy);
DIE *SubprogramDie = new DIE(DW_TAG_subprogram);
SubprogramDie->AddString (DW_AT_name, DW_FORM_string, Name);
SubprogramDie->AddUInt (DW_AT_decl_file, 0, FileID);
SubprogramDie->AddUInt (DW_AT_decl_line, 0, Line);
SubprogramDie->AddDIEntry (DW_AT_type, DW_FORM_ref4, Type);
SubprogramDie->AddUInt (DW_AT_external, DW_FORM_flag, 1);
// Add to map.
Slot = SubprogramDie;
// Add to context owner.
Unit->getDie()->AddChild(SubprogramDie);
// Expose as global.
Unit->AddGlobal(Name, SubprogramDie);
return SubprogramDie;
}
/// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
/// tools to recognize the object file contains Dwarf information.
///
void DwarfWriter::EmitInitial() const {
// Dwarf sections base addresses.
Asm->SwitchSection(DwarfFrameSection, 0);
EmitLabel("section_frame", 0);
Asm->SwitchSection(DwarfInfoSection, 0);
EmitLabel("section_info", 0);
EmitLabel("info", 0);
Asm->SwitchSection(DwarfAbbrevSection, 0);
EmitLabel("section_abbrev", 0);
EmitLabel("abbrev", 0);
Asm->SwitchSection(DwarfARangesSection, 0);
EmitLabel("section_aranges", 0);
Asm->SwitchSection(DwarfMacInfoSection, 0);
EmitLabel("section_macinfo", 0);
Asm->SwitchSection(DwarfLineSection, 0);
EmitLabel("section_line", 0);
EmitLabel("line", 0);
Asm->SwitchSection(DwarfLocSection, 0);
EmitLabel("section_loc", 0);
Asm->SwitchSection(DwarfPubNamesSection, 0);
EmitLabel("section_pubnames", 0);
Asm->SwitchSection(DwarfStrSection, 0);
EmitLabel("section_str", 0);
Asm->SwitchSection(DwarfRangesSection, 0);
EmitLabel("section_ranges", 0);
Asm->SwitchSection(TextSection, 0);
EmitLabel("text_begin", 0);
Asm->SwitchSection(DataSection, 0);
EmitLabel("data_begin", 0);
}
/// EmitDIE - Recusively Emits a debug information entry.
///
void DwarfWriter::EmitDIE(DIE *Die) const {
// Get the abbreviation for this DIE.
unsigned AbbrevID = Die->getAbbrevID();
const DIEAbbrev &Abbrev = Abbreviations[AbbrevID];
O << "\n";
// Emit the code (index) for the abbreviation.
EmitULEB128Bytes(AbbrevID);
EOL(std::string("Abbrev [" +
utostr(AbbrevID) +
"] 0x" + utohexstr(Die->getOffset()) +
":0x" + utohexstr(Die->getSize()) + " " +
TagString(Abbrev.getTag())));
const std::vector<DIEValue *> &Values = Die->getValues();
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev.getData();
// Emit the DIE attribute values.
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
unsigned Attr = AbbrevData[i].getAttribute();
unsigned Form = AbbrevData[i].getForm();
assert(Form && "Too many attributes for DIE (check abbreviation)");
switch (Attr) {
case DW_AT_sibling: {
EmitInt32(Die->SiblingOffset());
break;
}
default: {
// Emit an attribute using the defined form.
Values[i]->EmitValue(*this, Form);
break;
}
}
EOL(AttributeString(Attr));
}
// Emit the DIE children if any.
if (Abbrev.getChildrenFlag() == DW_CHILDREN_yes) {
const std::vector<DIE *> &Children = Die->getChildren();
for (unsigned j = 0, M = Children.size(); j < M; ++j) {
// FIXME - handle sibling offsets.
// FIXME - handle all DIE types.
EmitDIE(Children[j]);
}
EmitInt8(0); EOL("End Of Children Mark");
}
}
/// SizeAndOffsetDie - Compute the size and offset of a DIE.
///
unsigned DwarfWriter::SizeAndOffsetDie(DIE *Die, unsigned Offset) {
// Record the abbreviation.
Die->Complete(*this);
// Get the abbreviation for this DIE.
unsigned AbbrevID = Die->getAbbrevID();
const DIEAbbrev &Abbrev = Abbreviations[AbbrevID];
// Set DIE offset
Die->setOffset(Offset);
// Start the size with the size of abbreviation code.
Offset += SizeULEB128(AbbrevID);
const std::vector<DIEValue *> &Values = Die->getValues();
const std::vector<DIEAbbrevData> &AbbrevData = Abbrev.getData();
// Emit the DIE attribute values.
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
// Size attribute value.
Offset += Values[i]->SizeOf(*this, AbbrevData[i].getForm());
}
// Emit the DIE children if any.
if (Abbrev.getChildrenFlag() == DW_CHILDREN_yes) {
const std::vector<DIE *> &Children = Die->getChildren();
for (unsigned j = 0, M = Children.size(); j < M; ++j) {
// FIXME - handle sibling offsets.
// FIXME - handle all DIE types.
Offset = SizeAndOffsetDie(Children[j], Offset);
}
// 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 DwarfWriter::SizeAndOffsets() {
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
// Compute size of compile unit header
unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
sizeof(int16_t) + // DWARF version number
sizeof(int32_t) + // Offset Into Abbrev. Section
sizeof(int8_t); // Pointer Size (in bytes)
SizeAndOffsetDie(Unit->getDie(), Offset);
}
}
}
/// EmitDebugInfo - Emit the debug info section.
///
void DwarfWriter::EmitDebugInfo() const {
// Start debug info section.
Asm->SwitchSection(DwarfInfoSection, 0);
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
DIE *Die = Unit->getDie();
// Emit the compile units header.
EmitLabel("info_begin", Unit->getID());
// Emit size of content not including length itself
unsigned ContentSize = Die->getSize() +
sizeof(int16_t) + // DWARF version number
sizeof(int32_t) + // Offset Into Abbrev. Section
sizeof(int8_t); // Pointer Size (in bytes)
EmitInt32(ContentSize); EOL("Length of Compilation Unit Info");
EmitInt16(DWARF_VERSION); EOL("DWARF version number");
EmitReference("abbrev_begin", 0); EOL("Offset Into Abbrev. Section");
EmitInt8(AddressSize); EOL("Address Size (in bytes)");
EmitDIE(Die);
EmitLabel("info_end", Unit->getID());
}
O << "\n";
}
}
/// EmitAbbreviations - Emit the abbreviation section.
///
void DwarfWriter::EmitAbbreviations() const {
// Check to see if it is worth the effort.
if (!Abbreviations.empty()) {
// Start the debug abbrev section.
Asm->SwitchSection(DwarfAbbrevSection, 0);
EmitLabel("abbrev_begin", 0);
// For each abbrevation.
for (unsigned AbbrevID = 1, NAID = Abbreviations.size();
AbbrevID <= NAID; ++AbbrevID) {
// Get abbreviation data
const DIEAbbrev &Abbrev = Abbreviations[AbbrevID];
// Emit the abbrevations code (base 1 index.)
EmitULEB128Bytes(AbbrevID); EOL("Abbreviation Code");
// Emit the abbreviations data.
Abbrev.Emit(*this);
O << "\n";
}
EmitLabel("abbrev_end", 0);
O << "\n";
}
}
/// EmitDebugLines - Emit source line information.
///
void DwarfWriter::EmitDebugLines() const {
// Minimum line delta, thus ranging from -10..(255-10).
const int MinLineDelta = -(DW_LNS_fixed_advance_pc + 1);
// Maximum line delta, thus ranging from -10..(255-10).
const int MaxLineDelta = 255 + MinLineDelta;
// Start the dwarf line section.
Asm->SwitchSection(DwarfLineSection, 0);
// Construct the section header.
EmitDifference("line_end", 0, "line_begin", 0);
EOL("Length of Source Line Info");
EmitLabel("line_begin", 0);
EmitInt16(DWARF_VERSION); EOL("DWARF version number");
EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0);
EOL("Prolog Length");
EmitLabel("line_prolog_begin", 0);
EmitInt8(1); EOL("Minimum Instruction Length");
EmitInt8(1); EOL("Default is_stmt_start flag");
EmitInt8(MinLineDelta); EOL("Line Base Value (Special Opcodes)");
EmitInt8(MaxLineDelta); EOL("Line Range Value (Special Opcodes)");
EmitInt8(-MinLineDelta); EOL("Special Opcode Base");
// Line number standard opcode encodings argument count
EmitInt8(0); EOL("DW_LNS_copy arg count");
EmitInt8(1); EOL("DW_LNS_advance_pc arg count");
EmitInt8(1); EOL("DW_LNS_advance_line arg count");
EmitInt8(1); EOL("DW_LNS_set_file arg count");
EmitInt8(1); EOL("DW_LNS_set_column arg count");
EmitInt8(0); EOL("DW_LNS_negate_stmt arg count");
EmitInt8(0); EOL("DW_LNS_set_basic_block arg count");
EmitInt8(0); EOL("DW_LNS_const_add_pc arg count");
EmitInt8(1); EOL("DW_LNS_fixed_advance_pc arg count");
const UniqueVector<std::string> &Directories = DebugInfo->getDirectories();
const UniqueVector<SourceFileInfo> &SourceFiles = DebugInfo->getSourceFiles();
// Emit directories.
for (unsigned DirectoryID = 1, NDID = Directories.size();
DirectoryID <= NDID; ++DirectoryID) {
EmitString(Directories[DirectoryID]); EOL("Directory");
}
EmitInt8(0); EOL("End of directories");
// Emit files.
for (unsigned SourceID = 1, NSID = SourceFiles.size();
SourceID <= NSID; ++SourceID) {
const SourceFileInfo &SourceFile = SourceFiles[SourceID];
EmitString(SourceFile.getName()); EOL("Source");
EmitULEB128Bytes(SourceFile.getDirectoryID()); EOL("Directory #");
EmitULEB128Bytes(0); EOL("Mod date");
EmitULEB128Bytes(0); EOL("File size");
}
EmitInt8(0); EOL("End of files");
EmitLabel("line_prolog_end", 0);
// Emit line information
const std::vector<SourceLineInfo *> &LineInfos = DebugInfo->getSourceLines();
// 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) {
SourceLineInfo *LineInfo = LineInfos[i];
if (DwarfVerbose) {
unsigned SourceID = LineInfo->getSourceID();
const SourceFileInfo &SourceFile = SourceFiles[SourceID];
unsigned DirectoryID = SourceFile.getDirectoryID();
O << "\t"
<< Asm->CommentString << " "
<< Directories[DirectoryID]
<< SourceFile.getName() << ":"
<< LineInfo->getLine() << "\n";
}
// Define the line address.
EmitInt8(0); EOL("Extended Op");
EmitInt8(4 + 1); EOL("Op size");
EmitInt8(DW_LNE_set_address); EOL("DW_LNE_set_address");
EmitReference("loc", i + 1); EOL("Location label");
// If change of source, then switch to the new source.
if (Source != LineInfo->getSourceID()) {
Source = LineInfo->getSourceID();
EmitInt8(DW_LNS_set_file); EOL("DW_LNS_set_file");
EmitULEB128Bytes(Source); EOL("New Source");
}
// If change of line.
if (Line != LineInfo->getLine()) {
// Determine offset.
int Offset = LineInfo->getLine() - Line;
int Delta = Offset - MinLineDelta;
// Update line.
Line = LineInfo->getLine();
// If delta is small enough and in range...
if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
// ... then use fast opcode.
EmitInt8(Delta - MinLineDelta); EOL("Line Delta");
} else {
// ... otherwise use long hand.
EmitInt8(DW_LNS_advance_line); EOL("DW_LNS_advance_line");
EmitSLEB128Bytes(Offset); EOL("Line Offset");
EmitInt8(DW_LNS_copy); EOL("DW_LNS_copy");
}
} else {
// Copy the previous row (different address or source)
EmitInt8(DW_LNS_copy); EOL("DW_LNS_copy");
}
}
// Define last address.
EmitInt8(0); EOL("Extended Op");
EmitInt8(4 + 1); EOL("Op size");
EmitInt8(DW_LNE_set_address); EOL("DW_LNE_set_address");
EmitReference("text_end", 0); EOL("Location label");
// Mark end of matrix.
EmitInt8(0); EOL("DW_LNE_end_sequence");
EmitULEB128Bytes(1); O << "\n";
EmitInt8(1); O << "\n";
EmitLabel("line_end", 0);
O << "\n";
}
/// EmitDebugFrame - Emit visible names into a debug frame section.
///
void DwarfWriter::EmitDebugFrame() {
// FIXME - Should be per frame
}
/// EmitDebugPubNames - Emit visible names into a debug pubnames section.
///
void DwarfWriter::EmitDebugPubNames() {
// Start the dwarf pubnames section.
Asm->SwitchSection(DwarfPubNamesSection, 0);
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
EmitDifference("pubnames_end", Unit->getID(),
"pubnames_begin", Unit->getID());
EOL("Length of Public Names Info");
EmitLabel("pubnames_begin", Unit->getID());
EmitInt16(DWARF_VERSION); EOL("DWARF Version");
EmitReference("info_begin", Unit->getID());
EOL("Offset of Compilation Unit Info");
EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID());
EOL("Compilation Unit Length");
std::map<std::string, DIE *> &Globals = Unit->getGlobals();
for (std::map<std::string, DIE *>::iterator GI = Globals.begin(),
GE = Globals.end();
GI != GE; ++GI) {
const std::string &Name = GI->first;
DIE * Entity = GI->second;
EmitInt32(Entity->getOffset()); EOL("DIE offset");
EmitString(Name); EOL("External Name");
}
EmitInt32(0); EOL("End Mark");
EmitLabel("pubnames_end", Unit->getID());
O << "\n";
}
}
}
/// EmitDebugStr - Emit visible names into a debug str section.
///
void DwarfWriter::EmitDebugStr() {
// Check to see if it is worth the effort.
if (!StringPool.empty()) {
// Start the dwarf str section.
Asm->SwitchSection(DwarfStrSection, 0);
// For each of strings in teh string pool.
for (unsigned StringID = 1, N = StringPool.size();
StringID <= N; ++StringID) {
// Emit a label for reference from debug information entries.
EmitLabel("string", StringID);
// Emit the string itself.
const std::string &String = StringPool[StringID];
EmitString(String); O << "\n";
}
O << "\n";
}
}
/// EmitDebugLoc - Emit visible names into a debug loc section.
///
void DwarfWriter::EmitDebugLoc() {
// Start the dwarf loc section.
Asm->SwitchSection(DwarfLocSection, 0);
O << "\n";
}
/// EmitDebugARanges - Emit visible names into a debug aranges section.
///
void DwarfWriter::EmitDebugARanges() {
// Start the dwarf aranges section.
Asm->SwitchSection(DwarfARangesSection, 0);
// FIXME - Mock up
#if 0
// Process each compile unit.
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
CompileUnit *Unit = CompileUnits[i];
if (Unit->hasContent()) {
// Don't include size of length
EmitInt32(0x1c); EOL("Length of Address Ranges Info");
EmitInt16(DWARF_VERSION); EOL("Dwarf Version");
EmitReference("info_begin", Unit->getID());
EOL("Offset of Compilation Unit Info");
EmitInt8(AddressSize); EOL("Size of Address");
EmitInt8(0); EOL("Size of Segment Descriptor");
EmitInt16(0); EOL("Pad (1)");
EmitInt16(0); EOL("Pad (2)");
// Range 1
EmitReference("text_begin", 0); EOL("Address");
EmitDifference("text_end", 0, "text_begin", 0); EOL("Length");
EmitInt32(0); EOL("EOM (1)");
EmitInt32(0); EOL("EOM (2)");
O << "\n";
}
}
#endif
}
/// EmitDebugRanges - Emit visible names into a debug ranges section.
///
void DwarfWriter::EmitDebugRanges() {
// Start the dwarf ranges section.
Asm->SwitchSection(DwarfRangesSection, 0);
O << "\n";
}
/// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
///
void DwarfWriter::EmitDebugMacInfo() {
// Start the dwarf macinfo section.
Asm->SwitchSection(DwarfMacInfoSection, 0);
O << "\n";
}
/// ConstructCompileUnitDIEs - Create a compile unit DIE for each source and
/// header file.
void DwarfWriter::ConstructCompileUnitDIEs() {
const UniqueVector<CompileUnitDesc *> CUW = DebugInfo->getCompileUnits();
for (unsigned i = 1, N = CUW.size(); i <= N; ++i) {
CompileUnit *Unit = NewCompileUnit(CUW[i], i);
CompileUnits.push_back(Unit);
}
}
/// ConstructGlobalDIEs - Create DIEs for each of the externally visible global
/// variables.
void DwarfWriter::ConstructGlobalDIEs(Module &M) {
std::vector<GlobalVariableDesc *> GlobalVariables =
DebugInfo->getAnchoredDescriptors<GlobalVariableDesc>(M);
for (unsigned i = 0, N = GlobalVariables.size(); i < N; ++i) {
GlobalVariableDesc *GVD = GlobalVariables[i];
NewGlobalVariable(GVD);
}
}
/// ConstructSubprogramDIEs - Create DIEs for each of the externally visible
/// subprograms.
void DwarfWriter::ConstructSubprogramDIEs(Module &M) {
std::vector<SubprogramDesc *> Subprograms =
DebugInfo->getAnchoredDescriptors<SubprogramDesc>(M);
for (unsigned i = 0, N = Subprograms.size(); i < N; ++i) {
SubprogramDesc *SPD = Subprograms[i];
NewSubprogram(SPD);
}
}
/// ShouldEmitDwarf - Determine if Dwarf declarations should be made.
///
bool DwarfWriter::ShouldEmitDwarf() {
// Check if debug info is present.
if (!DebugInfo || !DebugInfo->hasInfo()) return false;
// Make sure initial declarations are made.
if (!didInitial) {
EmitInitial();
didInitial = true;
}
// Okay to emit.
return true;
}
//===----------------------------------------------------------------------===//
// Main entry points.
//
DwarfWriter::DwarfWriter(std::ostream &OS, AsmPrinter *A)
: O(OS)
, Asm(A)
, DebugInfo(NULL)
, didInitial(false)
, CompileUnits()
, Abbreviations()
, StringPool()
, DescToUnitMap()
, DescToDieMap()
, TypeToDieMap()
, AddressSize(sizeof(int32_t))
, hasLEB128(false)
, hasDotLoc(false)
, hasDotFile(false)
, needsSet(false)
, DwarfAbbrevSection(".debug_abbrev")
, DwarfInfoSection(".debug_info")
, DwarfLineSection(".debug_line")
, DwarfFrameSection(".debug_frame")
, DwarfPubNamesSection(".debug_pubnames")
, DwarfPubTypesSection(".debug_pubtypes")
, DwarfStrSection(".debug_str")
, DwarfLocSection(".debug_loc")
, DwarfARangesSection(".debug_aranges")
, DwarfRangesSection(".debug_ranges")
, DwarfMacInfoSection(".debug_macinfo")
, TextSection(".text")
, DataSection(".data")
{}
DwarfWriter::~DwarfWriter() {
for (unsigned i = 0, N = CompileUnits.size(); i < N; ++i) {
delete CompileUnits[i];
}
}
/// BeginModule - Emit all Dwarf sections that should come prior to the content.
///
void DwarfWriter::BeginModule(Module &M) {
if (!ShouldEmitDwarf()) return;
EOL("Dwarf Begin Module");
}
/// EndModule - Emit all Dwarf sections that should come after the content.
///
void DwarfWriter::EndModule(Module &M) {
if (!ShouldEmitDwarf()) return;
EOL("Dwarf End Module");
// Standard sections final addresses.
Asm->SwitchSection(TextSection, 0);
EmitLabel("text_end", 0);
Asm->SwitchSection(DataSection, 0);
EmitLabel("data_end", 0);
// Create all the compile unit DIEs.
ConstructCompileUnitDIEs();
// Create DIEs for each of the externally visible global variables.
ConstructGlobalDIEs(M);
// Create DIEs for each of the externally visible subprograms.
ConstructSubprogramDIEs(M);
// 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 frame section.
// EmitDebugFrame();
// 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.
///
void DwarfWriter::BeginFunction(MachineFunction &MF) {
if (!ShouldEmitDwarf()) return;
EOL("Dwarf Begin Function");
}
/// EndFunction - Gather and emit post-function debug information.
///
void DwarfWriter::EndFunction(MachineFunction &MF) {
if (!ShouldEmitDwarf()) return;
EOL("Dwarf End Function");
}
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