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llvm-6502/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
Devang Patel e4b275610a Reapply 79977. 
Use MDNodes to encode debug info in llvm IR.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80406 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-28 23:24:31 +00:00

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//===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing dwarf debug info into asm files.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "dwarfdebug"
#include "DwarfDebug.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/Debug.h"
#include "llvm/System/Path.h"
using namespace llvm;
static TimerGroup &getDwarfTimerGroup() {
static TimerGroup DwarfTimerGroup("Dwarf Debugging");
return DwarfTimerGroup;
}
//===----------------------------------------------------------------------===//
/// Configuration values for initial hash set sizes (log2).
///
static const unsigned InitDiesSetSize = 9; // log2(512)
static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
static const unsigned InitValuesSetSize = 9; // log2(512)
namespace llvm {
//===----------------------------------------------------------------------===//
/// CompileUnit - This dwarf writer support class manages information associate
/// with a source file.
class VISIBILITY_HIDDEN CompileUnit {
/// ID - File identifier for source.
///
unsigned ID;
/// Die - Compile unit debug information entry.
///
DIE *Die;
/// GVToDieMap - Tracks the mapping of unit level debug informaton
/// variables to debug information entries.
/// FIXME : Rename GVToDieMap -> NodeToDieMap
std::map<MDNode *, DIE *> GVToDieMap;
/// GVToDIEEntryMap - Tracks the mapping of unit level debug informaton
/// descriptors to debug information entries using a DIEEntry proxy.
/// FIXME : Rename
std::map<MDNode *, DIEEntry *> GVToDIEEntryMap;
/// Globals - A map of globally visible named entities for this unit.
///
StringMap<DIE*> Globals;
/// DiesSet - Used to uniquely define dies within the compile unit.
///
FoldingSet<DIE> DiesSet;
public:
CompileUnit(unsigned I, DIE *D)
: ID(I), Die(D), DiesSet(InitDiesSetSize) {}
~CompileUnit() { delete Die; }
// Accessors.
unsigned getID() const { return ID; }
DIE* getDie() const { return Die; }
StringMap<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 variable.
DIE *&getDieMapSlotFor(MDNode *N) { return GVToDieMap[N]; }
/// getDIEEntrySlotFor - Returns the debug information entry proxy slot for
/// the specified debug variable.
DIEEntry *&getDIEEntrySlotFor(MDNode *N) {
return GVToDIEEntryMap[N];
}
/// 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;
}
};
//===----------------------------------------------------------------------===//
/// DbgVariable - This class is used to track local variable information.
///
class VISIBILITY_HIDDEN DbgVariable {
DIVariable Var; // Variable Descriptor.
unsigned FrameIndex; // Variable frame index.
bool InlinedFnVar; // Variable for an inlined function.
public:
DbgVariable(DIVariable V, unsigned I, bool IFV)
: Var(V), FrameIndex(I), InlinedFnVar(IFV) {}
// Accessors.
DIVariable getVariable() const { return Var; }
unsigned getFrameIndex() const { return FrameIndex; }
bool isInlinedFnVar() const { return InlinedFnVar; }
};
//===----------------------------------------------------------------------===//
/// DbgScope - This class is used to track scope information.
///
class DbgConcreteScope;
class VISIBILITY_HIDDEN DbgScope {
DbgScope *Parent; // Parent to this scope.
DIDescriptor Desc; // Debug info descriptor for scope.
// Either subprogram or block.
unsigned StartLabelID; // Label ID of the beginning of scope.
unsigned EndLabelID; // Label ID of the end of scope.
SmallVector<DbgScope *, 4> Scopes; // Scopes defined in scope.
SmallVector<DbgVariable *, 8> Variables;// Variables declared in scope.
SmallVector<DbgConcreteScope *, 8> ConcreteInsts;// Concrete insts of funcs.
// Private state for dump()
mutable unsigned IndentLevel;
public:
DbgScope(DbgScope *P, DIDescriptor D)
: Parent(P), Desc(D), StartLabelID(0), EndLabelID(0), IndentLevel(0) {}
virtual ~DbgScope();
// Accessors.
DbgScope *getParent() const { return Parent; }
DIDescriptor getDesc() const { return Desc; }
unsigned getStartLabelID() const { return StartLabelID; }
unsigned getEndLabelID() const { return EndLabelID; }
SmallVector<DbgScope *, 4> &getScopes() { return Scopes; }
SmallVector<DbgVariable *, 8> &getVariables() { return Variables; }
SmallVector<DbgConcreteScope*,8> &getConcreteInsts() { return ConcreteInsts; }
void setStartLabelID(unsigned S) { StartLabelID = S; }
void setEndLabelID(unsigned E) { EndLabelID = E; }
/// AddScope - Add a scope to the scope.
///
void AddScope(DbgScope *S) { Scopes.push_back(S); }
/// AddVariable - Add a variable to the scope.
///
void AddVariable(DbgVariable *V) { Variables.push_back(V); }
/// AddConcreteInst - Add a concrete instance to the scope.
///
void AddConcreteInst(DbgConcreteScope *C) { ConcreteInsts.push_back(C); }
#ifndef NDEBUG
void dump() const;
#endif
};
#ifndef NDEBUG
void DbgScope::dump() const {
raw_ostream &err = errs();
err.indent(IndentLevel);
Desc.dump();
err << " [" << StartLabelID << ", " << EndLabelID << "]\n";
IndentLevel += 2;
for (unsigned i = 0, e = Scopes.size(); i != e; ++i)
if (Scopes[i] != this)
Scopes[i]->dump();
IndentLevel -= 2;
}
#endif
//===----------------------------------------------------------------------===//
/// DbgConcreteScope - This class is used to track a scope that holds concrete
/// instance information.
///
class VISIBILITY_HIDDEN DbgConcreteScope : public DbgScope {
CompileUnit *Unit;
DIE *Die; // Debug info for this concrete scope.
public:
DbgConcreteScope(DIDescriptor D) : DbgScope(NULL, D) {}
// Accessors.
DIE *getDie() const { return Die; }
void setDie(DIE *D) { Die = D; }
};
DbgScope::~DbgScope() {
for (unsigned i = 0, N = Scopes.size(); i < N; ++i)
delete Scopes[i];
for (unsigned j = 0, M = Variables.size(); j < M; ++j)
delete Variables[j];
for (unsigned k = 0, O = ConcreteInsts.size(); k < O; ++k)
delete ConcreteInsts[k];
}
} // end llvm namespace
DwarfDebug::DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T)
: Dwarf(OS, A, T, "dbg"), ModuleCU(0),
AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(),
ValuesSet(InitValuesSetSize), Values(), StringPool(),
SectionSourceLines(), didInitial(false), shouldEmit(false),
FunctionDbgScope(0), DebugTimer(0) {
if (TimePassesIsEnabled)
DebugTimer = new Timer("Dwarf Debug Writer",
getDwarfTimerGroup());
}
DwarfDebug::~DwarfDebug() {
for (unsigned j = 0, M = Values.size(); j < M; ++j)
delete Values[j];
for (DenseMap<const MDNode *, DbgScope *>::iterator
I = AbstractInstanceRootMap.begin(),
E = AbstractInstanceRootMap.end(); I != E;++I)
delete I->second;
delete DebugTimer;
}
/// AssignAbbrevNumber - Define a unique number for the abbreviation.
///
void DwarfDebug::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());
}
}
/// CreateDIEEntry - Creates a new DIEEntry to be a proxy for a debug
/// information entry.
DIEEntry *DwarfDebug::CreateDIEEntry(DIE *Entry) {
DIEEntry *Value;
if (Entry) {
FoldingSetNodeID ID;
DIEEntry::Profile(ID, Entry);
void *Where;
Value = static_cast<DIEEntry *>(ValuesSet.FindNodeOrInsertPos(ID, Where));
if (Value) return Value;
Value = new DIEEntry(Entry);
ValuesSet.InsertNode(Value, Where);
} else {
Value = new DIEEntry(Entry);
}
Values.push_back(Value);
return Value;
}
/// SetDIEEntry - Set a DIEEntry once the debug information entry is defined.
///
void DwarfDebug::SetDIEEntry(DIEEntry *Value, DIE *Entry) {
Value->setEntry(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 DwarfDebug::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 DwarfDebug::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 string attribute data and value.
///
void DwarfDebug::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 DwarfDebug::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 DwarfDebug::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);
}
/// AddSectionOffset - Add a section offset label attribute data and value.
///
void DwarfDebug::AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
const DWLabel &Label, const DWLabel &Section,
bool isEH, bool useSet) {
FoldingSetNodeID ID;
DIESectionOffset::Profile(ID, Label, Section);
void *Where;
DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
if (!Value) {
Value = new DIESectionOffset(Label, Section, isEH, useSet);
ValuesSet.InsertNode(Value, Where);
Values.push_back(Value);
}
Die->AddValue(Attribute, Form, Value);
}
/// AddDelta - Add a label delta attribute data and value.
///
void DwarfDebug::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);
}
/// AddBlock - Add block data.
///
void DwarfDebug::AddBlock(DIE *Die, unsigned Attribute, unsigned Form,
DIEBlock *Block) {
Block->ComputeSize(TD);
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);
}
/// AddSourceLine - Add location information to specified debug information
/// entry.
void DwarfDebug::AddSourceLine(DIE *Die, const DIVariable *V) {
// If there is no compile unit specified, don't add a line #.
if (V->getCompileUnit().isNull())
return;
unsigned Line = V->getLineNumber();
unsigned FileID = FindCompileUnit(V->getCompileUnit()).getID();
assert(FileID && "Invalid file id");
AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
}
/// AddSourceLine - Add location information to specified debug information
/// entry.
void DwarfDebug::AddSourceLine(DIE *Die, const DIGlobal *G) {
// If there is no compile unit specified, don't add a line #.
if (G->getCompileUnit().isNull())
return;
unsigned Line = G->getLineNumber();
unsigned FileID = FindCompileUnit(G->getCompileUnit()).getID();
assert(FileID && "Invalid file id");
AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
}
void DwarfDebug::AddSourceLine(DIE *Die, const DIType *Ty) {
// If there is no compile unit specified, don't add a line #.
DICompileUnit CU = Ty->getCompileUnit();
if (CU.isNull())
return;
unsigned Line = Ty->getLineNumber();
unsigned FileID = FindCompileUnit(CU).getID();
assert(FileID && "Invalid file id");
AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
}
/// AddAddress - Add an address attribute to a die based on the location
/// provided.
void DwarfDebug::AddAddress(DIE *Die, unsigned Attribute,
const MachineLocation &Location) {
unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
DIEBlock *Block = new DIEBlock();
if (Location.isReg()) {
if (Reg < 32) {
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
} else {
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
}
} else {
if (Reg < 32) {
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
} else {
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
}
AddUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
}
AddBlock(Die, Attribute, 0, Block);
}
/// AddType - Add a new type attribute to the specified entity.
void DwarfDebug::AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty) {
if (Ty.isNull())
return;
// Check for pre-existence.
DIEEntry *&Slot = DW_Unit->getDIEEntrySlotFor(Ty.getNode());
// If it exists then use the existing value.
if (Slot) {
Entity->AddValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Slot);
return;
}
// Set up proxy.
Slot = CreateDIEEntry();
// Construct type.
DIE Buffer(dwarf::DW_TAG_base_type);
if (Ty.isBasicType(Ty.getTag()))
ConstructTypeDIE(DW_Unit, Buffer, DIBasicType(Ty.getNode()));
else if (Ty.isCompositeType(Ty.getTag()))
ConstructTypeDIE(DW_Unit, Buffer, DICompositeType(Ty.getNode()));
else {
assert(Ty.isDerivedType(Ty.getTag()) && "Unknown kind of DIType");
ConstructTypeDIE(DW_Unit, Buffer, DIDerivedType(Ty.getNode()));
}
// Add debug information entry to entity and appropriate context.
DIE *Die = NULL;
DIDescriptor Context = Ty.getContext();
if (!Context.isNull())
Die = DW_Unit->getDieMapSlotFor(Context.getNode());
if (Die) {
DIE *Child = new DIE(Buffer);
Die->AddChild(Child);
Buffer.Detach();
SetDIEEntry(Slot, Child);
} else {
Die = DW_Unit->AddDie(Buffer);
SetDIEEntry(Slot, Die);
}
Entity->AddValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Slot);
}
/// ConstructTypeDIE - Construct basic type die from DIBasicType.
void DwarfDebug::ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
DIBasicType BTy) {
// Get core information.
std::string Name;
BTy.getName(Name);
Buffer.setTag(dwarf::DW_TAG_base_type);
AddUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
BTy.getEncoding());
// Add name if not anonymous or intermediate type.
if (!Name.empty())
AddString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
uint64_t Size = BTy.getSizeInBits() >> 3;
AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
}
/// ConstructTypeDIE - Construct derived type die from DIDerivedType.
void DwarfDebug::ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
DIDerivedType DTy) {
// Get core information.
std::string Name;
DTy.getName(Name);
uint64_t Size = DTy.getSizeInBits() >> 3;
unsigned Tag = DTy.getTag();
// FIXME - Workaround for templates.
if (Tag == dwarf::DW_TAG_inheritance) Tag = dwarf::DW_TAG_reference_type;
Buffer.setTag(Tag);
// Map to main type, void will not have a type.
DIType FromTy = DTy.getTypeDerivedFrom();
AddType(DW_Unit, &Buffer, FromTy);
// Add name if not anonymous or intermediate type.
if (!Name.empty())
AddString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
// Add size if non-zero (derived types might be zero-sized.)
if (Size)
AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
// Add source line info if available and TyDesc is not a forward declaration.
if (!DTy.isForwardDecl())
AddSourceLine(&Buffer, &DTy);
}
/// ConstructTypeDIE - Construct type DIE from DICompositeType.
void DwarfDebug::ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
DICompositeType CTy) {
// Get core information.
std::string Name;
CTy.getName(Name);
uint64_t Size = CTy.getSizeInBits() >> 3;
unsigned Tag = CTy.getTag();
Buffer.setTag(Tag);
switch (Tag) {
case dwarf::DW_TAG_vector_type:
case dwarf::DW_TAG_array_type:
ConstructArrayTypeDIE(DW_Unit, Buffer, &CTy);
break;
case dwarf::DW_TAG_enumeration_type: {
DIArray Elements = CTy.getTypeArray();
// Add enumerators to enumeration type.
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
DIE *ElemDie = NULL;
DIEnumerator Enum(Elements.getElement(i).getNode());
ElemDie = ConstructEnumTypeDIE(DW_Unit, &Enum);
Buffer.AddChild(ElemDie);
}
}
break;
case dwarf::DW_TAG_subroutine_type: {
// Add return type.
DIArray Elements = CTy.getTypeArray();
DIDescriptor RTy = Elements.getElement(0);
AddType(DW_Unit, &Buffer, DIType(RTy.getNode()));
// Add prototype flag.
AddUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
// Add arguments.
for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
DIDescriptor Ty = Elements.getElement(i);
AddType(DW_Unit, Arg, DIType(Ty.getNode()));
Buffer.AddChild(Arg);
}
}
break;
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_class_type: {
// Add elements to structure type.
DIArray Elements = CTy.getTypeArray();
// A forward struct declared type may not have elements available.
if (Elements.isNull())
break;
// Add elements to structure type.
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
DIDescriptor Element = Elements.getElement(i);
if (Element.isNull())
continue;
DIE *ElemDie = NULL;
if (Element.getTag() == dwarf::DW_TAG_subprogram)
ElemDie = CreateSubprogramDIE(DW_Unit,
DISubprogram(Element.getNode()));
else
ElemDie = CreateMemberDIE(DW_Unit,
DIDerivedType(Element.getNode()));
Buffer.AddChild(ElemDie);
}
if (CTy.isAppleBlockExtension())
AddUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1);
unsigned RLang = CTy.getRunTimeLang();
if (RLang)
AddUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class,
dwarf::DW_FORM_data1, RLang);
break;
}
default:
break;
}
// Add name if not anonymous or intermediate type.
if (!Name.empty())
AddString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
if (Tag == dwarf::DW_TAG_enumeration_type ||
Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type) {
// Add size if non-zero (derived types might be zero-sized.)
if (Size)
AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
else {
// Add zero size if it is not a forward declaration.
if (CTy.isForwardDecl())
AddUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
else
AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0);
}
// Add source line info if available.
if (!CTy.isForwardDecl())
AddSourceLine(&Buffer, &CTy);
}
}
/// ConstructSubrangeDIE - Construct subrange DIE from DISubrange.
void DwarfDebug::ConstructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){
int64_t L = SR.getLo();
int64_t H = SR.getHi();
DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type);
AddDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy);
if (L)
AddSInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
if (H)
AddSInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
Buffer.AddChild(DW_Subrange);
}
/// ConstructArrayTypeDIE - Construct array type DIE from DICompositeType.
void DwarfDebug::ConstructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
DICompositeType *CTy) {
Buffer.setTag(dwarf::DW_TAG_array_type);
if (CTy->getTag() == dwarf::DW_TAG_vector_type)
AddUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1);
// Emit derived type.
AddType(DW_Unit, &Buffer, CTy->getTypeDerivedFrom());
DIArray Elements = CTy->getTypeArray();
// Construct an anonymous type for index type.
DIE IdxBuffer(dwarf::DW_TAG_base_type);
AddUInt(&IdxBuffer, dwarf::DW_AT_byte_size, 0, sizeof(int32_t));
AddUInt(&IdxBuffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
dwarf::DW_ATE_signed);
DIE *IndexTy = DW_Unit->AddDie(IdxBuffer);
// Add subranges to array type.
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
DIDescriptor Element = Elements.getElement(i);
if (Element.getTag() == dwarf::DW_TAG_subrange_type)
ConstructSubrangeDIE(Buffer, DISubrange(Element.getNode()), IndexTy);
}
}
/// ConstructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
DIE *DwarfDebug::ConstructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy) {
DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator);
std::string Name;
ETy->getName(Name);
AddString(Enumerator, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
int64_t Value = ETy->getEnumValue();
AddSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
return Enumerator;
}
/// CreateGlobalVariableDIE - Create new DIE using GV.
DIE *DwarfDebug::CreateGlobalVariableDIE(CompileUnit *DW_Unit,
const DIGlobalVariable &GV) {
DIE *GVDie = new DIE(dwarf::DW_TAG_variable);
std::string Name;
GV.getDisplayName(Name);
AddString(GVDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
std::string LinkageName;
GV.getLinkageName(LinkageName);
if (!LinkageName.empty()) {
// Skip special LLVM prefix that is used to inform the asm printer to not
// emit usual symbol prefix before the symbol name. This happens for
// Objective-C symbol names and symbol whose name is replaced using GCC's
// __asm__ attribute.
if (LinkageName[0] == 1)
LinkageName = &LinkageName[1];
AddString(GVDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
LinkageName);
}
AddType(DW_Unit, GVDie, GV.getType());
if (!GV.isLocalToUnit())
AddUInt(GVDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
AddSourceLine(GVDie, &GV);
return GVDie;
}
/// CreateMemberDIE - Create new member DIE.
DIE *DwarfDebug::CreateMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT){
DIE *MemberDie = new DIE(DT.getTag());
std::string Name;
DT.getName(Name);
if (!Name.empty())
AddString(MemberDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
AddType(DW_Unit, MemberDie, DT.getTypeDerivedFrom());
AddSourceLine(MemberDie, &DT);
uint64_t Size = DT.getSizeInBits();
uint64_t FieldSize = DT.getOriginalTypeSize();
if (Size != FieldSize) {
// Handle bitfield.
AddUInt(MemberDie, dwarf::DW_AT_byte_size, 0, DT.getOriginalTypeSize()>>3);
AddUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits());
uint64_t Offset = DT.getOffsetInBits();
uint64_t FieldOffset = Offset;
uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
uint64_t HiMark = (Offset + FieldSize) & AlignMask;
FieldOffset = (HiMark - FieldSize);
Offset -= FieldOffset;
// Maybe we need to work from the other end.
if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
AddUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset);
}
DIEBlock *Block = new DIEBlock();
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
AddUInt(Block, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
AddBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, Block);
if (DT.isProtected())
AddUInt(MemberDie, dwarf::DW_AT_accessibility, 0,
dwarf::DW_ACCESS_protected);
else if (DT.isPrivate())
AddUInt(MemberDie, dwarf::DW_AT_accessibility, 0,
dwarf::DW_ACCESS_private);
return MemberDie;
}
/// CreateSubprogramDIE - Create new DIE using SP.
DIE *DwarfDebug::CreateSubprogramDIE(CompileUnit *DW_Unit,
const DISubprogram &SP,
bool IsConstructor,
bool IsInlined) {
DIE *SPDie = new DIE(dwarf::DW_TAG_subprogram);
std::string Name;
SP.getName(Name);
AddString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
std::string LinkageName;
SP.getLinkageName(LinkageName);
if (!LinkageName.empty()) {
// Skip special LLVM prefix that is used to inform the asm printer to not emit
// usual symbol prefix before the symbol name. This happens for Objective-C
// symbol names and symbol whose name is replaced using GCC's __asm__ attribute.
if (LinkageName[0] == 1)
LinkageName = &LinkageName[1];
AddString(SPDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
LinkageName);
}
AddSourceLine(SPDie, &SP);
DICompositeType SPTy = SP.getType();
DIArray Args = SPTy.getTypeArray();
// Add prototyped tag, if C or ObjC.
unsigned Lang = SP.getCompileUnit().getLanguage();
if (Lang == dwarf::DW_LANG_C99 || Lang == dwarf::DW_LANG_C89 ||
Lang == dwarf::DW_LANG_ObjC)
AddUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
// Add Return Type.
unsigned SPTag = SPTy.getTag();
if (!IsConstructor) {
if (Args.isNull() || SPTag != dwarf::DW_TAG_subroutine_type)
AddType(DW_Unit, SPDie, SPTy);
else
AddType(DW_Unit, SPDie, DIType(Args.getElement(0).getNode()));
}
if (!SP.isDefinition()) {
AddUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
// Add arguments. Do not add arguments for subprogram definition. They will
// be handled through RecordVariable.
if (SPTag == dwarf::DW_TAG_subroutine_type)
for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
AddType(DW_Unit, Arg, DIType(Args.getElement(i).getNode()));
AddUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); // ??
SPDie->AddChild(Arg);
}
}
if (!SP.isLocalToUnit() && !IsInlined)
AddUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
// DW_TAG_inlined_subroutine may refer to this DIE.
DIE *&Slot = DW_Unit->getDieMapSlotFor(SP.getNode());
Slot = SPDie;
return SPDie;
}
/// FindCompileUnit - Get the compile unit for the given descriptor.
///
CompileUnit &DwarfDebug::FindCompileUnit(DICompileUnit Unit) const {
DenseMap<Value *, CompileUnit *>::const_iterator I =
CompileUnitMap.find(Unit.getNode());
assert(I != CompileUnitMap.end() && "Missing compile unit.");
return *I->second;
}
/// CreateDbgScopeVariable - Create a new scope variable.
///
DIE *DwarfDebug::CreateDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
// Get the descriptor.
const DIVariable &VD = DV->getVariable();
// Translate tag to proper Dwarf tag. The result variable is dropped for
// now.
unsigned Tag;
switch (VD.getTag()) {
case dwarf::DW_TAG_return_variable:
return NULL;
case dwarf::DW_TAG_arg_variable:
Tag = dwarf::DW_TAG_formal_parameter;
break;
case dwarf::DW_TAG_auto_variable: // fall thru
default:
Tag = dwarf::DW_TAG_variable;
break;
}
// Define variable debug information entry.
DIE *VariableDie = new DIE(Tag);
std::string Name;
VD.getName(Name);
AddString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
// Add source line info if available.
AddSourceLine(VariableDie, &VD);
// Add variable type.
AddType(Unit, VariableDie, VD.getType());
// Add variable address.
if (!DV->isInlinedFnVar()) {
// Variables for abstract instances of inlined functions don't get a
// location.
MachineLocation Location;
Location.set(RI->getFrameRegister(*MF),
RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
AddAddress(VariableDie, dwarf::DW_AT_location, Location);
}
return VariableDie;
}
/// getOrCreateScope - Returns the scope associated with the given descriptor.
///
DbgScope *DwarfDebug::getOrCreateScope(MDNode *N) {
DbgScope *&Slot = DbgScopeMap[N];
if (Slot) return Slot;
DbgScope *Parent = NULL;
DIBlock Block(N);
// Don't create a new scope if we already created one for an inlined function.
DenseMap<const MDNode *, DbgScope *>::iterator
II = AbstractInstanceRootMap.find(N);
if (II != AbstractInstanceRootMap.end())
return LexicalScopeStack.back();
if (!Block.isNull()) {
DIDescriptor ParentDesc = Block.getContext();
Parent =
ParentDesc.isNull() ? NULL : getOrCreateScope(ParentDesc.getNode());
}
Slot = new DbgScope(Parent, DIDescriptor(N));
if (Parent)
Parent->AddScope(Slot);
else
// First function is top level function.
FunctionDbgScope = Slot;
return Slot;
}
/// ConstructDbgScope - Construct the components of a scope.
///
void DwarfDebug::ConstructDbgScope(DbgScope *ParentScope,
unsigned ParentStartID,
unsigned ParentEndID,
DIE *ParentDie, CompileUnit *Unit) {
// Add variables to scope.
SmallVector<DbgVariable *, 8> &Variables = ParentScope->getVariables();
for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
DIE *VariableDie = CreateDbgScopeVariable(Variables[i], Unit);
if (VariableDie) ParentDie->AddChild(VariableDie);
}
// Add concrete instances to scope.
SmallVector<DbgConcreteScope *, 8> &ConcreteInsts =
ParentScope->getConcreteInsts();
for (unsigned i = 0, N = ConcreteInsts.size(); i < N; ++i) {
DbgConcreteScope *ConcreteInst = ConcreteInsts[i];
DIE *Die = ConcreteInst->getDie();
unsigned StartID = ConcreteInst->getStartLabelID();
unsigned EndID = ConcreteInst->getEndLabelID();
// Add the scope bounds.
if (StartID)
AddLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
DWLabel("label", StartID));
else
AddLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
if (EndID)
AddLabel(Die, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
DWLabel("label", EndID));
else
AddLabel(Die, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
ParentDie->AddChild(Die);
}
// Add nested scopes.
SmallVector<DbgScope *, 4> &Scopes = ParentScope->getScopes();
for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
// Define the Scope debug information entry.
DbgScope *Scope = Scopes[j];
unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
// Ignore empty scopes.
if (StartID == EndID && StartID != 0) continue;
// Do not ignore inlined scopes even if they don't have any variables or
// scopes.
if (Scope->getScopes().empty() && Scope->getVariables().empty() &&
Scope->getConcreteInsts().empty())
continue;
if (StartID == ParentStartID && EndID == ParentEndID) {
// Just add stuff to the parent scope.
ConstructDbgScope(Scope, ParentStartID, ParentEndID, ParentDie, Unit);
} else {
DIE *ScopeDie = new DIE(dwarf::DW_TAG_lexical_block);
// Add the scope bounds.
if (StartID)
AddLabel(ScopeDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
DWLabel("label", StartID));
else
AddLabel(ScopeDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
if (EndID)
AddLabel(ScopeDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
DWLabel("label", EndID));
else
AddLabel(ScopeDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
// Add the scope's contents.
ConstructDbgScope(Scope, StartID, EndID, ScopeDie, Unit);
ParentDie->AddChild(ScopeDie);
}
}
}
/// ConstructFunctionDbgScope - Construct the scope for the subprogram.
///
void DwarfDebug::ConstructFunctionDbgScope(DbgScope *RootScope,
bool AbstractScope) {
// Exit if there is no root scope.
if (!RootScope) return;
DIDescriptor Desc = RootScope->getDesc();
if (Desc.isNull())
return;
// Get the subprogram debug information entry.
DISubprogram SPD(Desc.getNode());
// Get the subprogram die.
DIE *SPDie = ModuleCU->getDieMapSlotFor(SPD.getNode());
assert(SPDie && "Missing subprogram descriptor");
if (!AbstractScope) {
// Add the function bounds.
AddLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
AddLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
MachineLocation Location(RI->getFrameRegister(*MF));
AddAddress(SPDie, dwarf::DW_AT_frame_base, Location);
}
ConstructDbgScope(RootScope, 0, 0, SPDie, ModuleCU);
}
/// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
///
void DwarfDebug::ConstructDefaultDbgScope(MachineFunction *MF) {
StringMap<DIE*> &Globals = ModuleCU->getGlobals();
StringMap<DIE*>::iterator GI = Globals.find(MF->getFunction()->getName());
if (GI != Globals.end()) {
DIE *SPDie = GI->second;
// Add the function bounds.
AddLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
AddLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
MachineLocation Location(RI->getFrameRegister(*MF));
AddAddress(SPDie, dwarf::DW_AT_frame_base, Location);
}
}
/// GetOrCreateSourceID - Look up the source id with the given directory and
/// source file names. If none currently exists, create a new id and insert it
/// in the SourceIds map. This can update DirectoryNames and SourceFileNames
/// maps as well.
unsigned DwarfDebug::GetOrCreateSourceID(const std::string &DirName,
const std::string &FileName) {
unsigned DId;
StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName);
if (DI != DirectoryIdMap.end()) {
DId = DI->getValue();
} else {
DId = DirectoryNames.size() + 1;
DirectoryIdMap[DirName] = DId;
DirectoryNames.push_back(DirName);
}
unsigned FId;
StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName);
if (FI != SourceFileIdMap.end()) {
FId = FI->getValue();
} else {
FId = SourceFileNames.size() + 1;
SourceFileIdMap[FileName] = FId;
SourceFileNames.push_back(FileName);
}
DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI =
SourceIdMap.find(std::make_pair(DId, FId));
if (SI != SourceIdMap.end())
return SI->second;
unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0.
SourceIdMap[std::make_pair(DId, FId)] = SrcId;
SourceIds.push_back(std::make_pair(DId, FId));
return SrcId;
}
void DwarfDebug::ConstructCompileUnit(MDNode *N) {
DICompileUnit DIUnit(N);
std::string Dir, FN, Prod;
unsigned ID = GetOrCreateSourceID(DIUnit.getDirectory(Dir),
DIUnit.getFilename(FN));
DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
AddSectionOffset(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
DWLabel("section_line", 0), DWLabel("section_line", 0),
false);
AddString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string,
DIUnit.getProducer(Prod));
AddUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data1,
DIUnit.getLanguage());
AddString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
if (!Dir.empty())
AddString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir);
if (DIUnit.isOptimized())
AddUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
std::string Flags;
DIUnit.getFlags(Flags);
if (!Flags.empty())
AddString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags);
unsigned RVer = DIUnit.getRunTimeVersion();
if (RVer)
AddUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
dwarf::DW_FORM_data1, RVer);
CompileUnit *Unit = new CompileUnit(ID, Die);
if (!ModuleCU && DIUnit.isMain()) {
// Use first compile unit marked as isMain as the compile unit
// for this module.
ModuleCU = Unit;
}
CompileUnitMap[DIUnit.getNode()] = Unit;
CompileUnits.push_back(Unit);
}
void DwarfDebug::ConstructGlobalVariableDIE(MDNode *N) {
DIGlobalVariable DI_GV(N);
// Check for pre-existence.
DIE *&Slot = ModuleCU->getDieMapSlotFor(DI_GV.getNode());
if (Slot)
return;
DIE *VariableDie = CreateGlobalVariableDIE(ModuleCU, DI_GV);
// Add address.
DIEBlock *Block = new DIEBlock();
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
std::string GLN;
AddObjectLabel(Block, 0, dwarf::DW_FORM_udata,
Asm->getGlobalLinkName(DI_GV.getGlobal(), GLN));
AddBlock(VariableDie, dwarf::DW_AT_location, 0, Block);
// Add to map.
Slot = VariableDie;
// Add to context owner.
ModuleCU->getDie()->AddChild(VariableDie);
// Expose as global. FIXME - need to check external flag.
std::string Name;
ModuleCU->AddGlobal(DI_GV.getName(Name), VariableDie);
return;
}
void DwarfDebug::ConstructSubprogram(MDNode *N) {
DISubprogram SP(N);
// Check for pre-existence.
DIE *&Slot = ModuleCU->getDieMapSlotFor(N);
if (Slot)
return;
if (!SP.isDefinition())
// This is a method declaration which will be handled while constructing
// class type.
return;
DIE *SubprogramDie = CreateSubprogramDIE(ModuleCU, SP);
// Add to map.
Slot = SubprogramDie;
// Add to context owner.
ModuleCU->getDie()->AddChild(SubprogramDie);
// Expose as global.
std::string Name;
ModuleCU->AddGlobal(SP.getName(Name), SubprogramDie);
return;
}
/// BeginModule - Emit all Dwarf sections that should come prior to the
/// content. Create global DIEs and emit initial debug info sections.
/// This is inovked by the target AsmPrinter.
void DwarfDebug::BeginModule(Module *M, MachineModuleInfo *mmi) {
this->M = M;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
DebugInfoFinder DbgFinder;
DbgFinder.processModule(*M);
// Create all the compile unit DIEs.
for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
E = DbgFinder.compile_unit_end(); I != E; ++I)
ConstructCompileUnit(*I);
if (CompileUnits.empty()) {
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return;
}
// If main compile unit for this module is not seen than randomly
// select first compile unit.
if (!ModuleCU)
ModuleCU = CompileUnits[0];
// If there is not any debug info available for any global variables and any
// subprograms then there is not any debug info to emit.
if (DbgFinder.global_variable_count() == 0
&& DbgFinder.subprogram_count() == 0) {
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return;
}
// Create DIEs for each of the externally visible global variables.
for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
E = DbgFinder.global_variable_end(); I != E; ++I)
ConstructGlobalVariableDIE(*I);
// Create DIEs for each of the externally visible subprograms.
for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
E = DbgFinder.subprogram_end(); I != E; ++I)
ConstructSubprogram(*I);
MMI = mmi;
shouldEmit = true;
MMI->setDebugInfoAvailability(true);
// Prime section data.
SectionMap.insert(Asm->getObjFileLowering().getTextSection());
// Print out .file directives to specify files for .loc directives. These are
// printed out early so that they precede any .loc directives.
if (MAI->hasDotLocAndDotFile()) {
for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) {
// Remember source id starts at 1.
std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(i);
sys::Path FullPath(getSourceDirectoryName(Id.first));
bool AppendOk =
FullPath.appendComponent(getSourceFileName(Id.second));
assert(AppendOk && "Could not append filename to directory!");
AppendOk = false;
Asm->EmitFile(i, FullPath.str());
Asm->EOL();
}
}
// Emit initial sections
EmitInitial();
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
}
/// EndModule - Emit all Dwarf sections that should come after the content.
///
void DwarfDebug::EndModule() {
if (!ShouldEmitDwarfDebug())
return;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
// Standard sections final addresses.
Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
EmitLabel("text_end", 0);
Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
EmitLabel("data_end", 0);
// End text sections.
for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
Asm->OutStreamer.SwitchSection(SectionMap[i]);
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();
// Emit inline info.
EmitDebugInlineInfo();
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
}
/// BeginFunction - Gather pre-function debug information. Assumes being
/// emitted immediately after the function entry point.
void DwarfDebug::BeginFunction(MachineFunction *MF) {
this->MF = MF;
if (!ShouldEmitDwarfDebug()) return;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
// Begin accumulating function debug information.
MMI->BeginFunction(MF);
// Assumes in correct section after the entry point.
EmitLabel("func_begin", ++SubprogramCount);
// Emit label for the implicitly defined dbg.stoppoint at the start of the
// function.
DebugLoc FDL = MF->getDefaultDebugLoc();
if (!FDL.isUnknown()) {
DebugLocTuple DLT = MF->getDebugLocTuple(FDL);
unsigned LabelID = RecordSourceLine(DLT.Line, DLT.Col,
DICompileUnit(DLT.CompileUnit));
Asm->printLabel(LabelID);
}
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
}
/// EndFunction - Gather and emit post-function debug information.
///
void DwarfDebug::EndFunction(MachineFunction *MF) {
if (!ShouldEmitDwarfDebug()) return;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
// Define end label for subprogram.
EmitLabel("func_end", SubprogramCount);
// Get function line info.
if (!Lines.empty()) {
// Get section line info.
unsigned ID = SectionMap.insert(Asm->getCurrentSection());
if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
// Append the function info to section info.
SectionLineInfos.insert(SectionLineInfos.end(),
Lines.begin(), Lines.end());
}
// Construct the DbgScope for abstract instances.
for (SmallVector<DbgScope *, 32>::iterator
I = AbstractInstanceRootList.begin(),
E = AbstractInstanceRootList.end(); I != E; ++I)
ConstructFunctionDbgScope(*I);
// Construct scopes for subprogram.
if (FunctionDbgScope)
ConstructFunctionDbgScope(FunctionDbgScope);
else
// FIXME: This is wrong. We are essentially getting past a problem with
// debug information not being able to handle unreachable blocks that have
// debug information in them. In particular, those unreachable blocks that
// have "region end" info in them. That situation results in the "root
// scope" not being created. If that's the case, then emit a "default"
// scope, i.e., one that encompasses the whole function. This isn't
// desirable. And a better way of handling this (and all of the debugging
// information) needs to be explored.
ConstructDefaultDbgScope(MF);
DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
MMI->getFrameMoves()));
// Clear debug info
if (FunctionDbgScope) {
delete FunctionDbgScope;
DbgScopeMap.clear();
DbgAbstractScopeMap.clear();
DbgConcreteScopeMap.clear();
FunctionDbgScope = NULL;
LexicalScopeStack.clear();
AbstractInstanceRootList.clear();
AbstractInstanceRootMap.clear();
}
Lines.clear();
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
}
/// RecordSourceLine - Records location information and associates it with a
/// label. Returns a unique label ID used to generate a label and provide
/// correspondence to the source line list.
unsigned DwarfDebug::RecordSourceLine(Value *V, unsigned Line, unsigned Col) {
if (TimePassesIsEnabled)
DebugTimer->startTimer();
CompileUnit *Unit = CompileUnitMap[V];
assert(Unit && "Unable to find CompileUnit");
unsigned ID = MMI->NextLabelID();
Lines.push_back(SrcLineInfo(Line, Col, Unit->getID(), ID));
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return ID;
}
/// RecordSourceLine - Records location information and associates it with a
/// label. Returns a unique label ID used to generate a label and provide
/// correspondence to the source line list.
unsigned DwarfDebug::RecordSourceLine(unsigned Line, unsigned Col,
DICompileUnit CU) {
if (!MMI)
return 0;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
std::string Dir, Fn;
unsigned Src = GetOrCreateSourceID(CU.getDirectory(Dir),
CU.getFilename(Fn));
unsigned ID = MMI->NextLabelID();
Lines.push_back(SrcLineInfo(Line, Col, Src, ID));
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return ID;
}
/// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
/// timed. Look up the source id with the given directory and source file
/// names. If none currently exists, create a new id and insert it in the
/// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
/// well.
unsigned DwarfDebug::getOrCreateSourceID(const std::string &DirName,
const std::string &FileName) {
if (TimePassesIsEnabled)
DebugTimer->startTimer();
unsigned SrcId = GetOrCreateSourceID(DirName, FileName);
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return SrcId;
}
/// RecordRegionStart - Indicate the start of a region.
unsigned DwarfDebug::RecordRegionStart(MDNode *N) {
if (TimePassesIsEnabled)
DebugTimer->startTimer();
DbgScope *Scope = getOrCreateScope(N);
unsigned ID = MMI->NextLabelID();
if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
LexicalScopeStack.push_back(Scope);
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return ID;
}
/// RecordRegionEnd - Indicate the end of a region.
unsigned DwarfDebug::RecordRegionEnd(MDNode *N) {
if (TimePassesIsEnabled)
DebugTimer->startTimer();
DbgScope *Scope = getOrCreateScope(N);
unsigned ID = MMI->NextLabelID();
Scope->setEndLabelID(ID);
// FIXME : region.end() may not be in the last basic block.
// For now, do not pop last lexical scope because next basic
// block may start new inlined function's body.
unsigned LSSize = LexicalScopeStack.size();
if (LSSize != 0 && LSSize != 1)
LexicalScopeStack.pop_back();
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return ID;
}
/// RecordVariable - Indicate the declaration of a local variable.
void DwarfDebug::RecordVariable(MDNode *N, unsigned FrameIndex) {
if (TimePassesIsEnabled)
DebugTimer->startTimer();
DIDescriptor Desc(N);
DbgScope *Scope = NULL;
bool InlinedFnVar = false;
if (Desc.getTag() == dwarf::DW_TAG_variable)
Scope = getOrCreateScope(DIGlobalVariable(N).getContext().getNode());
else {
bool InlinedVar = false;
MDNode *Context = DIVariable(N).getContext().getNode();
DISubprogram SP(Context);
if (!SP.isNull()) {
// SP is inserted into DbgAbstractScopeMap when inlined function
// start was recorded by RecordInlineFnStart.
DenseMap<MDNode *, DbgScope *>::iterator
I = DbgAbstractScopeMap.find(SP.getNode());
if (I != DbgAbstractScopeMap.end()) {
InlinedVar = true;
Scope = I->second;
}
}
if (!InlinedVar)
Scope = getOrCreateScope(Context);
}
assert(Scope && "Unable to find the variable's scope");
DbgVariable *DV = new DbgVariable(DIVariable(N), FrameIndex, InlinedFnVar);
Scope->AddVariable(DV);
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
}
//// RecordInlinedFnStart - Indicate the start of inlined subroutine.
unsigned DwarfDebug::RecordInlinedFnStart(DISubprogram &SP, DICompileUnit CU,
unsigned Line, unsigned Col) {
unsigned LabelID = MMI->NextLabelID();
if (!MAI->doesDwarfUsesInlineInfoSection())
return LabelID;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
MDNode *Node = SP.getNode();
DenseMap<const MDNode *, DbgScope *>::iterator
II = AbstractInstanceRootMap.find(Node);
if (II == AbstractInstanceRootMap.end()) {
// Create an abstract instance entry for this inlined function if it doesn't
// already exist.
DbgScope *Scope = new DbgScope(NULL, DIDescriptor(Node));
// Get the compile unit context.
DIE *SPDie = ModuleCU->getDieMapSlotFor(Node);
if (!SPDie)
SPDie = CreateSubprogramDIE(ModuleCU, SP, false, true);
// Mark as being inlined. This makes this subprogram entry an abstract
// instance root.
// FIXME: Our debugger doesn't care about the value of DW_AT_inline, only
// that it's defined. That probably won't change in the future. However,
// this could be more elegant.
AddUInt(SPDie, dwarf::DW_AT_inline, 0, dwarf::DW_INL_declared_not_inlined);
// Keep track of the abstract scope for this function.
DbgAbstractScopeMap[Node] = Scope;
AbstractInstanceRootMap[Node] = Scope;
AbstractInstanceRootList.push_back(Scope);
}
// Create a concrete inlined instance for this inlined function.
DbgConcreteScope *ConcreteScope = new DbgConcreteScope(DIDescriptor(Node));
DIE *ScopeDie = new DIE(dwarf::DW_TAG_inlined_subroutine);
ScopeDie->setAbstractCompileUnit(ModuleCU);
DIE *Origin = ModuleCU->getDieMapSlotFor(Node);
AddDIEEntry(ScopeDie, dwarf::DW_AT_abstract_origin,
dwarf::DW_FORM_ref4, Origin);
AddUInt(ScopeDie, dwarf::DW_AT_call_file, 0, ModuleCU->getID());
AddUInt(ScopeDie, dwarf::DW_AT_call_line, 0, Line);
AddUInt(ScopeDie, dwarf::DW_AT_call_column, 0, Col);
ConcreteScope->setDie(ScopeDie);
ConcreteScope->setStartLabelID(LabelID);
MMI->RecordUsedDbgLabel(LabelID);
LexicalScopeStack.back()->AddConcreteInst(ConcreteScope);
// Keep track of the concrete scope that's inlined into this function.
DenseMap<MDNode *, SmallVector<DbgScope *, 8> >::iterator
SI = DbgConcreteScopeMap.find(Node);
if (SI == DbgConcreteScopeMap.end())
DbgConcreteScopeMap[Node].push_back(ConcreteScope);
else
SI->second.push_back(ConcreteScope);
// Track the start label for this inlined function.
DenseMap<MDNode *, SmallVector<unsigned, 4> >::iterator
I = InlineInfo.find(Node);
if (I == InlineInfo.end())
InlineInfo[Node].push_back(LabelID);
else
I->second.push_back(LabelID);
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return LabelID;
}
/// RecordInlinedFnEnd - Indicate the end of inlined subroutine.
unsigned DwarfDebug::RecordInlinedFnEnd(DISubprogram &SP) {
if (!MAI->doesDwarfUsesInlineInfoSection())
return 0;
if (TimePassesIsEnabled)
DebugTimer->startTimer();
MDNode *Node = SP.getNode();
DenseMap<MDNode *, SmallVector<DbgScope *, 8> >::iterator
I = DbgConcreteScopeMap.find(Node);
if (I == DbgConcreteScopeMap.end()) {
// FIXME: Can this situation actually happen? And if so, should it?
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return 0;
}
SmallVector<DbgScope *, 8> &Scopes = I->second;
if (Scopes.empty()) {
// Returned ID is 0 if this is unbalanced "end of inlined
// scope". This could happen if optimizer eats dbg intrinsics
// or "beginning of inlined scope" is not recoginized due to
// missing location info. In such cases, ignore this region.end.
return 0;
}
DbgScope *Scope = Scopes.back(); Scopes.pop_back();
unsigned ID = MMI->NextLabelID();
MMI->RecordUsedDbgLabel(ID);
Scope->setEndLabelID(ID);
if (TimePassesIsEnabled)
DebugTimer->stopTimer();
return ID;
}
//===----------------------------------------------------------------------===//
// Emit Methods
//===----------------------------------------------------------------------===//
/// SizeAndOffsetDie - Compute the size and offset of a DIE.
///
unsigned DwarfDebug::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 += MCAsmInfo::getULEB128Size(AbbrevNumber);
const SmallVector<DIEValue*, 32> &Values = Die->getValues();
const SmallVector<DIEAbbrevData, 8> &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(TD, AbbrevData[i].getForm());
// Size the DIE children if any.
if (!Children.empty()) {
assert(Abbrev->getChildrenFlag() == dwarf::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 DwarfDebug::SizeAndOffsets() {
// Compute size of compile unit header.
static 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(ModuleCU->getDie(), Offset, true);
CompileUnitOffsets[ModuleCU] = 0;
}
/// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
/// tools to recognize the object file contains Dwarf information.
void DwarfDebug::EmitInitial() {
// Check to see if we already emitted intial headers.
if (didInitial) return;
didInitial = true;
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
// Dwarf sections base addresses.
if (MAI->doesDwarfRequireFrameSection()) {
Asm->OutStreamer.SwitchSection(TLOF.getDwarfFrameSection());
EmitLabel("section_debug_frame", 0);
}
Asm->OutStreamer.SwitchSection(TLOF.getDwarfInfoSection());
EmitLabel("section_info", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDwarfAbbrevSection());
EmitLabel("section_abbrev", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDwarfARangesSection());
EmitLabel("section_aranges", 0);
if (const MCSection *LineInfoDirective = TLOF.getDwarfMacroInfoSection()) {
Asm->OutStreamer.SwitchSection(LineInfoDirective);
EmitLabel("section_macinfo", 0);
}
Asm->OutStreamer.SwitchSection(TLOF.getDwarfLineSection());
EmitLabel("section_line", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDwarfLocSection());
EmitLabel("section_loc", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubNamesSection());
EmitLabel("section_pubnames", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDwarfStrSection());
EmitLabel("section_str", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDwarfRangesSection());
EmitLabel("section_ranges", 0);
Asm->OutStreamer.SwitchSection(TLOF.getTextSection());
EmitLabel("text_begin", 0);
Asm->OutStreamer.SwitchSection(TLOF.getDataSection());
EmitLabel("data_begin", 0);
}
/// EmitDIE - Recusively Emits a debug information entry.
///
void DwarfDebug::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);
if (Asm->isVerbose())
Asm->EOL(std::string("Abbrev [" +
utostr(AbbrevNumber) +
"] 0x" + utohexstr(Die->getOffset()) +
":0x" + utohexstr(Die->getSize()) + " " +
dwarf::TagString(Abbrev->getTag())));
else
Asm->EOL();
SmallVector<DIEValue*, 32> &Values = Die->getValues();
const SmallVector<DIEAbbrevData, 8> &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 dwarf::DW_AT_sibling:
Asm->EmitInt32(Die->SiblingOffset());
break;
case dwarf::DW_AT_abstract_origin: {
DIEEntry *E = cast<DIEEntry>(Values[i]);
DIE *Origin = E->getEntry();
unsigned Addr =
CompileUnitOffsets[Die->getAbstractCompileUnit()] +
Origin->getOffset();
Asm->EmitInt32(Addr);
break;
}
default:
// Emit an attribute using the defined form.
Values[i]->EmitValue(this, Form);
break;
}
Asm->EOL(dwarf::AttributeString(Attr));
}
// Emit the DIE children if any.
if (Abbrev->getChildrenFlag() == dwarf::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");
}
}
/// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
///
void DwarfDebug::EmitDebugInfoPerCU(CompileUnit *Unit) {
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::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();
}
void DwarfDebug::EmitDebugInfo() {
// Start debug info section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfInfoSection());
EmitDebugInfoPerCU(ModuleCU);
}
/// EmitAbbreviations - Emit the abbreviation section.
///
void DwarfDebug::EmitAbbreviations() const {
// Check to see if it is worth the effort.
if (!Abbreviations.empty()) {
// Start the debug abbrev section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().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(Asm);
Asm->EOL();
}
// Mark end of abbreviations.
Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
EmitLabel("abbrev_end", 0);
Asm->EOL();
}
}
/// EmitEndOfLineMatrix - Emit the last address of the section and the end of
/// the line matrix.
///
void DwarfDebug::EmitEndOfLineMatrix(unsigned SectionEnd) {
// Define last address of section.
Asm->EmitInt8(0); Asm->EOL("Extended Op");
Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
Asm->EmitInt8(dwarf::DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
EmitReference("section_end", SectionEnd); 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();
}
/// EmitDebugLines - Emit source line information.
///
void DwarfDebug::EmitDebugLines() {
// If the target is using .loc/.file, the assembler will be emitting the
// .debug_line table automatically.
if (MAI->hasDotLocAndDotFile())
return;
// Minimum line delta, thus ranging from -10..(255-10).
const int MinLineDelta = -(dwarf::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->OutStreamer.SwitchSection(
Asm->getObjFileLowering().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::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");
// Emit directories.
for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
Asm->EmitString(getSourceDirectoryName(DI));
Asm->EOL("Directory");
}
Asm->EmitInt8(0); Asm->EOL("End of directories");
// Emit files.
for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
// Remember source id starts at 1.
std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI);
Asm->EmitString(getSourceFileName(Id.second));
Asm->EOL("Source");
Asm->EmitULEB128Bytes(Id.first);
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.
unsigned SecSrcLinesSize = SectionSourceLines.size();
for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
// Isolate current sections line info.
const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
/*if (Asm->isVerbose()) {
const MCSection *S = SectionMap[j + 1];
O << '\t' << MAI->getCommentString() << " Section"
<< S->getName() << '\n';
}*/
Asm->EOL();
// 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 SrcLineInfo &LineInfo = LineInfos[i];
unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
if (!LabelID) continue;
if (!Asm->isVerbose())
Asm->EOL();
else {
std::pair<unsigned, unsigned> SourceID =
getSourceDirectoryAndFileIds(LineInfo.getSourceID());
O << '\t' << MAI->getCommentString() << ' '
<< getSourceDirectoryName(SourceID.first) << ' '
<< getSourceFileName(SourceID.second)
<<" :" << utostr_32(LineInfo.getLine()) << '\n';
}
// Define the line address.
Asm->EmitInt8(0); Asm->EOL("Extended Op");
Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
Asm->EmitInt8(dwarf::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(dwarf::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(dwarf::DW_LNS_advance_line);
Asm->EOL("DW_LNS_advance_line");
Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
Asm->EmitInt8(dwarf::DW_LNS_copy); Asm->EOL("DW_LNS_copy");
}
} else {
// Copy the previous row (different address or source)
Asm->EmitInt8(dwarf::DW_LNS_copy); Asm->EOL("DW_LNS_copy");
}
}
EmitEndOfLineMatrix(j + 1);
}
if (SecSrcLinesSize == 0)
// Because we're emitting a debug_line section, we still need a line
// table. The linker and friends expect it to exist. If there's nothing to
// put into it, emit an empty table.
EmitEndOfLineMatrix(1);
EmitLabel("line_end", 0);
Asm->EOL();
}
/// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
///
void DwarfDebug::EmitCommonDebugFrame() {
if (!MAI->doesDwarfRequireFrameSection())
return;
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize();
// Start the dwarf frame section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().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)dwarf::DW_CIE_ID);
Asm->EOL("CIE Identifier Tag");
Asm->EmitInt8(dwarf::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(), false));
Asm->EOL("CIE RA Column");
std::vector<MachineMove> Moves;
RI->getInitialFrameState(Moves);
EmitFrameMoves(NULL, 0, Moves, false);
Asm->EmitAlignment(2, 0, 0, false);
EmitLabel("debug_frame_common_end", 0);
Asm->EOL();
}
/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void
DwarfDebug::EmitFunctionDebugFrame(const FunctionDebugFrameInfo&DebugFrameInfo){
if (!MAI->doesDwarfRequireFrameSection())
return;
// Start the dwarf frame section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().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,
false);
Asm->EmitAlignment(2, 0, 0, false);
EmitLabel("debug_frame_end", DebugFrameInfo.Number);
Asm->EOL();
}
void DwarfDebug::EmitDebugPubNamesPerCU(CompileUnit *Unit) {
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::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");
StringMap<DIE*> &Globals = Unit->getGlobals();
for (StringMap<DIE*>::const_iterator
GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
const char *Name = GI->getKeyData();
DIE * Entity = GI->second;
Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
Asm->EmitString(Name, strlen(Name)); Asm->EOL("External Name");
}
Asm->EmitInt32(0); Asm->EOL("End Mark");
EmitLabel("pubnames_end", Unit->getID());
Asm->EOL();
}
/// EmitDebugPubNames - Emit visible names into a debug pubnames section.
///
void DwarfDebug::EmitDebugPubNames() {
// Start the dwarf pubnames section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfPubNamesSection());
EmitDebugPubNamesPerCU(ModuleCU);
}
/// EmitDebugStr - Emit visible names into a debug str section.
///
void DwarfDebug::EmitDebugStr() {
// Check to see if it is worth the effort.
if (!StringPool.empty()) {
// Start the dwarf str section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().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 DwarfDebug::EmitDebugLoc() {
// Start the dwarf loc section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfLocSection());
Asm->EOL();
}
/// EmitDebugARanges - Emit visible names into a debug aranges section.
///
void DwarfDebug::EmitDebugARanges() {
// Start the dwarf aranges section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().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::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 DwarfDebug::EmitDebugRanges() {
// Start the dwarf ranges section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfRangesSection());
Asm->EOL();
}
/// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
///
void DwarfDebug::EmitDebugMacInfo() {
if (const MCSection *LineInfo =
Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
// Start the dwarf macinfo section.
Asm->OutStreamer.SwitchSection(LineInfo);
Asm->EOL();
}
}
/// EmitDebugInlineInfo - Emit inline info using following format.
/// Section Header:
/// 1. length of section
/// 2. Dwarf version number
/// 3. address size.
///
/// Entries (one "entry" for each function that was inlined):
///
/// 1. offset into __debug_str section for MIPS linkage name, if exists;
/// otherwise offset into __debug_str for regular function name.
/// 2. offset into __debug_str section for regular function name.
/// 3. an unsigned LEB128 number indicating the number of distinct inlining
/// instances for the function.
///
/// The rest of the entry consists of a {die_offset, low_pc} pair for each
/// inlined instance; the die_offset points to the inlined_subroutine die in the
/// __debug_info section, and the low_pc is the starting address for the
/// inlining instance.
void DwarfDebug::EmitDebugInlineInfo() {
if (!MAI->doesDwarfUsesInlineInfoSection())
return;
if (!ModuleCU)
return;
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfDebugInlineSection());
Asm->EOL();
EmitDifference("debug_inlined_end", 1,
"debug_inlined_begin", 1, true);
Asm->EOL("Length of Debug Inlined Information Entry");
EmitLabel("debug_inlined_begin", 1);
Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("Dwarf Version");
Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
for (DenseMap<MDNode *, SmallVector<unsigned, 4> >::iterator
I = InlineInfo.begin(), E = InlineInfo.end(); I != E; ++I) {
MDNode *Node = I->first;
SmallVector<unsigned, 4> &Labels = I->second;
DISubprogram SP(Node);
std::string Name;
std::string LName;
SP.getLinkageName(LName);
SP.getName(Name);
if (LName.empty())
Asm->EmitString(Name);
else {
// Skip special LLVM prefix that is used to inform the asm printer to not
// emit usual symbol prefix before the symbol name. This happens for
// Objective-C symbol names and symbol whose name is replaced using GCC's
// __asm__ attribute.
if (LName[0] == 1)
LName = &LName[1];
Asm->EmitString(LName);
}
Asm->EOL("MIPS linkage name");
Asm->EmitString(Name); Asm->EOL("Function name");
Asm->EmitULEB128Bytes(Labels.size()); Asm->EOL("Inline count");
for (SmallVector<unsigned, 4>::iterator LI = Labels.begin(),
LE = Labels.end(); LI != LE; ++LI) {
DIE *SP = ModuleCU->getDieMapSlotFor(Node);
Asm->EmitInt32(SP->getOffset()); Asm->EOL("DIE offset");
if (TD->getPointerSize() == sizeof(int32_t))
O << MAI->getData32bitsDirective();
else
O << MAI->getData64bitsDirective();
PrintLabelName("label", *LI); Asm->EOL("low_pc");
}
}
EmitLabel("debug_inlined_end", 1);
Asm->EOL();
}
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