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llvm-project/llvm/lib/Analysis/DebugInfo.cpp

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//===--- DebugInfo.cpp - Debug Information Helper Classes -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the helper classes used to build and interpret debug
// information in LLVM IR form.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Instructions.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/DebugLoc.h"
#include "llvm/Support/Streams.h"
using namespace llvm;
using namespace llvm::dwarf;
//===----------------------------------------------------------------------===//
// DIDescriptor
//===----------------------------------------------------------------------===//
/// ValidDebugInfo - Return true if V represents valid debug info value.
bool DIDescriptor::ValidDebugInfo(Value *V, CodeGenOpt::Level OptLevel) {
if (!V)
return false;
GlobalVariable *GV = dyn_cast<GlobalVariable>(V->stripPointerCasts());
if (!GV)
return false;
if (!GV->hasInternalLinkage () && !GV->hasLinkOnceLinkage())
return false;
DIDescriptor DI(GV);
// Check current version. Allow Version6 for now.
unsigned Version = DI.getVersion();
if (Version != LLVMDebugVersion && Version != LLVMDebugVersion6)
return false;
unsigned Tag = DI.getTag();
switch (Tag) {
case DW_TAG_variable:
assert(DIVariable(GV).Verify() && "Invalid DebugInfo value");
break;
case DW_TAG_compile_unit:
assert(DICompileUnit(GV).Verify() && "Invalid DebugInfo value");
break;
case DW_TAG_subprogram:
assert(DISubprogram(GV).Verify() && "Invalid DebugInfo value");
break;
case DW_TAG_lexical_block:
// FIXME: This interfers with the quality of generated code during
// optimization.
if (OptLevel != CodeGenOpt::None)
return false;
// FALLTHROUGH
default:
break;
}
return true;
}
DIDescriptor::DIDescriptor(GlobalVariable *GV, unsigned RequiredTag) {
DbgGV = GV;
// If this is non-null, check to see if the Tag matches. If not, set to null.
if (GV && getTag() != RequiredTag)
DbgGV = 0;
}
const std::string &
DIDescriptor::getStringField(unsigned Elt, std::string &Result) const {
if (DbgGV == 0) {
Result.clear();
return Result;
}
Constant *C = DbgGV->getInitializer();
if (C == 0 || Elt >= C->getNumOperands()) {
Result.clear();
return Result;
}
// Fills in the string if it succeeds
if (!GetConstantStringInfo(C->getOperand(Elt), Result))
Result.clear();
return Result;
}
uint64_t DIDescriptor::getUInt64Field(unsigned Elt) const {
if (DbgGV == 0) return 0;
if (!DbgGV->hasInitializer()) return 0;
Constant *C = DbgGV->getInitializer();
if (C == 0 || Elt >= C->getNumOperands())
return 0;
if (ConstantInt *CI = dyn_cast<ConstantInt>(C->getOperand(Elt)))
return CI->getZExtValue();
return 0;
}
DIDescriptor DIDescriptor::getDescriptorField(unsigned Elt) const {
if (DbgGV == 0) return DIDescriptor();
Constant *C = DbgGV->getInitializer();
if (C == 0 || Elt >= C->getNumOperands())
return DIDescriptor();
C = C->getOperand(Elt);
return DIDescriptor(dyn_cast<GlobalVariable>(C->stripPointerCasts()));
}
GlobalVariable *DIDescriptor::getGlobalVariableField(unsigned Elt) const {
if (DbgGV == 0) return 0;
Constant *C = DbgGV->getInitializer();
if (C == 0 || Elt >= C->getNumOperands())
return 0;
C = C->getOperand(Elt);
return dyn_cast<GlobalVariable>(C->stripPointerCasts());
}
//===----------------------------------------------------------------------===//
// Simple Descriptor Constructors and other Methods
//===----------------------------------------------------------------------===//
// Needed by DIVariable::getType().
DIType::DIType(GlobalVariable *GV) : DIDescriptor(GV) {
if (!GV) return;
unsigned tag = getTag();
if (tag != dwarf::DW_TAG_base_type && !DIDerivedType::isDerivedType(tag) &&
!DICompositeType::isCompositeType(tag))
DbgGV = 0;
}
/// isDerivedType - Return true if the specified tag is legal for
/// DIDerivedType.
bool DIType::isDerivedType(unsigned Tag) {
switch (Tag) {
case dwarf::DW_TAG_typedef:
case dwarf::DW_TAG_pointer_type:
case dwarf::DW_TAG_reference_type:
case dwarf::DW_TAG_const_type:
case dwarf::DW_TAG_volatile_type:
case dwarf::DW_TAG_restrict_type:
case dwarf::DW_TAG_member:
case dwarf::DW_TAG_inheritance:
return true;
default:
// FIXME: Even though it doesn't make sense, CompositeTypes are current
// modelled as DerivedTypes, this should return true for them as well.
return false;
}
}
/// isCompositeType - Return true if the specified tag is legal for
/// DICompositeType.
bool DIType::isCompositeType(unsigned TAG) {
switch (TAG) {
case dwarf::DW_TAG_array_type:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_enumeration_type:
case dwarf::DW_TAG_vector_type:
case dwarf::DW_TAG_subroutine_type:
case dwarf::DW_TAG_class_type:
return true;
default:
return false;
}
}
/// isVariable - Return true if the specified tag is legal for DIVariable.
bool DIVariable::isVariable(unsigned Tag) {
switch (Tag) {
case dwarf::DW_TAG_auto_variable:
case dwarf::DW_TAG_arg_variable:
case dwarf::DW_TAG_return_variable:
return true;
default:
return false;
}
}
unsigned DIArray::getNumElements() const {
assert (DbgGV && "Invalid DIArray");
Constant *C = DbgGV->getInitializer();
assert (C && "Invalid DIArray initializer");
return C->getNumOperands();
}
/// replaceAllUsesWith - Replace all uses of debug info referenced by
/// this descriptor. After this completes, the current debug info value
/// is erased.
void DIDerivedType::replaceAllUsesWith(DIDescriptor &D) {
if (isNull())
return;
assert (!D.isNull() && "Can not replace with null");
getGV()->replaceAllUsesWith(D.getGV());
getGV()->eraseFromParent();
}
/// Verify - Verify that a compile unit is well formed.
bool DICompileUnit::Verify() const {
if (isNull())
return false;
std::string Res;
if (getFilename(Res).empty())
return false;
// It is possible that directory and produce string is empty.
return true;
}
/// Verify - Verify that a type descriptor is well formed.
bool DIType::Verify() const {
if (isNull())
return false;
if (getContext().isNull())
return false;
DICompileUnit CU = getCompileUnit();
if (!CU.isNull() && !CU.Verify())
return false;
return true;
}
/// Verify - Verify that a composite type descriptor is well formed.
bool DICompositeType::Verify() const {
if (isNull())
return false;
if (getContext().isNull())
return false;
DICompileUnit CU = getCompileUnit();
if (!CU.isNull() && !CU.Verify())
return false;
return true;
}
/// Verify - Verify that a subprogram descriptor is well formed.
bool DISubprogram::Verify() const {
if (isNull())
return false;
if (getContext().isNull())
return false;
DICompileUnit CU = getCompileUnit();
if (!CU.Verify())
return false;
DICompositeType Ty = getType();
if (!Ty.isNull() && !Ty.Verify())
return false;
return true;
}
/// Verify - Verify that a global variable descriptor is well formed.
bool DIGlobalVariable::Verify() const {
if (isNull())
return false;
if (getContext().isNull())
return false;
DICompileUnit CU = getCompileUnit();
if (!CU.isNull() && !CU.Verify())
return false;
DIType Ty = getType();
if (!Ty.Verify())
return false;
if (!getGlobal())
return false;
return true;
}
/// Verify - Verify that a variable descriptor is well formed.
bool DIVariable::Verify() const {
if (isNull())
return false;
if (getContext().isNull())
return false;
DIType Ty = getType();
if (!Ty.Verify())
return false;
return true;
}
/// getOriginalTypeSize - If this type is derived from a base type then
/// return base type size.
uint64_t DIDerivedType::getOriginalTypeSize() const {
if (getTag() != dwarf::DW_TAG_member)
return getSizeInBits();
DIType BT = getTypeDerivedFrom();
if (BT.getTag() != dwarf::DW_TAG_base_type)
return getSizeInBits();
return BT.getSizeInBits();
}
/// describes - Return true if this subprogram provides debugging
/// information for the function F.
bool DISubprogram::describes(const Function *F) {
assert (F && "Invalid function");
std::string Name;
getLinkageName(Name);
if (Name.empty())
getName(Name);
if (F->getName() == Name)
return true;
return false;
}
//===----------------------------------------------------------------------===//
// DIDescriptor: dump routines for all descriptors.
//===----------------------------------------------------------------------===//
/// dump - Print descriptor.
void DIDescriptor::dump() const {
cerr << "[" << dwarf::TagString(getTag()) << "] ";
cerr << std::hex << "[GV:" << DbgGV << "]" << std::dec;
}
/// dump - Print compile unit.
void DICompileUnit::dump() const {
if (getLanguage())
cerr << " [" << dwarf::LanguageString(getLanguage()) << "] ";
std::string Res1, Res2;
cerr << " [" << getDirectory(Res1) << "/" << getFilename(Res2) << " ]";
}
/// dump - Print type.
void DIType::dump() const {
if (isNull()) return;
std::string Res;
if (!getName(Res).empty())
cerr << " [" << Res << "] ";
unsigned Tag = getTag();
cerr << " [" << dwarf::TagString(Tag) << "] ";
// TODO : Print context
getCompileUnit().dump();
cerr << " ["
<< getLineNumber() << ", "
<< getSizeInBits() << ", "
<< getAlignInBits() << ", "
<< getOffsetInBits()
<< "] ";
if (isPrivate())
cerr << " [private] ";
else if (isProtected())
cerr << " [protected] ";
if (isForwardDecl())
cerr << " [fwd] ";
if (isBasicType(Tag))
DIBasicType(DbgGV).dump();
else if (isDerivedType(Tag))
DIDerivedType(DbgGV).dump();
else if (isCompositeType(Tag))
DICompositeType(DbgGV).dump();
else {
cerr << "Invalid DIType\n";
return;
}
cerr << "\n";
}
/// dump - Print basic type.
void DIBasicType::dump() const {
cerr << " [" << dwarf::AttributeEncodingString(getEncoding()) << "] ";
}
/// dump - Print derived type.
void DIDerivedType::dump() const {
cerr << "\n\t Derived From: "; getTypeDerivedFrom().dump();
}
/// dump - Print composite type.
void DICompositeType::dump() const {
DIArray A = getTypeArray();
if (A.isNull())
return;
cerr << " [" << A.getNumElements() << " elements]";
}
/// dump - Print global.
void DIGlobal::dump() const {
std::string Res;
if (!getName(Res).empty())
cerr << " [" << Res << "] ";
unsigned Tag = getTag();
cerr << " [" << dwarf::TagString(Tag) << "] ";
// TODO : Print context
getCompileUnit().dump();
cerr << " [" << getLineNumber() << "] ";
if (isLocalToUnit())
cerr << " [local] ";
if (isDefinition())
cerr << " [def] ";
if (isGlobalVariable(Tag))
DIGlobalVariable(DbgGV).dump();
cerr << "\n";
}
/// dump - Print subprogram.
void DISubprogram::dump() const {
DIGlobal::dump();
}
/// dump - Print global variable.
void DIGlobalVariable::dump() const {
cerr << " ["; getGlobal()->dump(); cerr << "] ";
}
/// dump - Print variable.
void DIVariable::dump() const {
std::string Res;
if (!getName(Res).empty())
cerr << " [" << Res << "] ";
getCompileUnit().dump();
cerr << " [" << getLineNumber() << "] ";
getType().dump();
cerr << "\n";
}
//===----------------------------------------------------------------------===//
// DIFactory: Basic Helpers
//===----------------------------------------------------------------------===//
DIFactory::DIFactory(Module &m)
: M(m), VMContext(M.getContext()), StopPointFn(0), FuncStartFn(0),
RegionStartFn(0), RegionEndFn(0),
DeclareFn(0) {
EmptyStructPtr = PointerType::getUnqual(StructType::get(VMContext));
}
/// getCastToEmpty - Return this descriptor as a Constant* with type '{}*'.
/// This is only valid when the descriptor is non-null.
Constant *DIFactory::getCastToEmpty(DIDescriptor D) {
if (D.isNull()) return llvm::Constant::getNullValue(EmptyStructPtr);
return ConstantExpr::getBitCast(D.getGV(), EmptyStructPtr);
}
Constant *DIFactory::GetTagConstant(unsigned TAG) {
assert((TAG & LLVMDebugVersionMask) == 0 &&
"Tag too large for debug encoding!");
return ConstantInt::get(Type::Int32Ty, TAG | LLVMDebugVersion);
}
Constant *DIFactory::GetStringConstant(const std::string &String) {
// Check string cache for previous edition.
Constant *&Slot = StringCache[String];
// Return Constant if previously defined.
if (Slot) return Slot;
const PointerType *DestTy = PointerType::getUnqual(Type::Int8Ty);
// If empty string then use a i8* null instead.
if (String.empty())
return Slot = ConstantPointerNull::get(DestTy);
// Construct string as an llvm constant.
Constant *ConstStr = ConstantArray::get(String);
// Otherwise create and return a new string global.
GlobalVariable *StrGV = new GlobalVariable(M, ConstStr->getType(), true,
GlobalVariable::InternalLinkage,
ConstStr, ".str");
StrGV->setSection("llvm.metadata");
return Slot = ConstantExpr::getBitCast(StrGV, DestTy);
}
//===----------------------------------------------------------------------===//
// DIFactory: Primary Constructors
//===----------------------------------------------------------------------===//
/// GetOrCreateArray - Create an descriptor for an array of descriptors.
/// This implicitly uniques the arrays created.
DIArray DIFactory::GetOrCreateArray(DIDescriptor *Tys, unsigned NumTys) {
SmallVector<Constant*, 16> Elts;
for (unsigned i = 0; i != NumTys; ++i)
Elts.push_back(getCastToEmpty(Tys[i]));
Constant *Init = ConstantArray::get(ArrayType::get(EmptyStructPtr,
Elts.size()),
Elts.data(), Elts.size());
// If we already have this array, just return the uniqued version.
DIDescriptor &Entry = SimpleConstantCache[Init];
if (!Entry.isNull()) return DIArray(Entry.getGV());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.array");
GV->setSection("llvm.metadata");
Entry = DIDescriptor(GV);
return DIArray(GV);
}
/// GetOrCreateSubrange - Create a descriptor for a value range. This
/// implicitly uniques the values returned.
DISubrange DIFactory::GetOrCreateSubrange(int64_t Lo, int64_t Hi) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_subrange_type),
ConstantInt::get(Type::Int64Ty, Lo),
ConstantInt::get(Type::Int64Ty, Hi)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
// If we already have this range, just return the uniqued version.
DIDescriptor &Entry = SimpleConstantCache[Init];
if (!Entry.isNull()) return DISubrange(Entry.getGV());
M.addTypeName("llvm.dbg.subrange.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.subrange");
GV->setSection("llvm.metadata");
Entry = DIDescriptor(GV);
return DISubrange(GV);
}
/// CreateCompileUnit - Create a new descriptor for the specified compile
/// unit. Note that this does not unique compile units within the module.
DICompileUnit DIFactory::CreateCompileUnit(unsigned LangID,
const std::string &Filename,
const std::string &Directory,
const std::string &Producer,
bool isMain,
bool isOptimized,
const char *Flags,
unsigned RunTimeVer) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_compile_unit),
llvm::Constant::getNullValue(EmptyStructPtr),
ConstantInt::get(Type::Int32Ty, LangID),
GetStringConstant(Filename),
GetStringConstant(Directory),
GetStringConstant(Producer),
ConstantInt::get(Type::Int1Ty, isMain),
ConstantInt::get(Type::Int1Ty, isOptimized),
GetStringConstant(Flags),
ConstantInt::get(Type::Int32Ty, RunTimeVer)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.compile_unit.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::LinkOnceAnyLinkage,
Init, "llvm.dbg.compile_unit");
GV->setSection("llvm.metadata");
return DICompileUnit(GV);
}
/// CreateEnumerator - Create a single enumerator value.
DIEnumerator DIFactory::CreateEnumerator(const std::string &Name, uint64_t Val){
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_enumerator),
GetStringConstant(Name),
ConstantInt::get(Type::Int64Ty, Val)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.enumerator.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.enumerator");
GV->setSection("llvm.metadata");
return DIEnumerator(GV);
}
/// CreateBasicType - Create a basic type like int, float, etc.
DIBasicType DIFactory::CreateBasicType(DIDescriptor Context,
const std::string &Name,
DICompileUnit CompileUnit,
unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
uint64_t OffsetInBits, unsigned Flags,
unsigned Encoding) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_base_type),
getCastToEmpty(Context),
GetStringConstant(Name),
getCastToEmpty(CompileUnit),
ConstantInt::get(Type::Int32Ty, LineNumber),
ConstantInt::get(Type::Int64Ty, SizeInBits),
ConstantInt::get(Type::Int64Ty, AlignInBits),
ConstantInt::get(Type::Int64Ty, OffsetInBits),
ConstantInt::get(Type::Int32Ty, Flags),
ConstantInt::get(Type::Int32Ty, Encoding)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.basictype.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.basictype");
GV->setSection("llvm.metadata");
return DIBasicType(GV);
}
/// CreateDerivedType - Create a derived type like const qualified type,
/// pointer, typedef, etc.
DIDerivedType DIFactory::CreateDerivedType(unsigned Tag,
DIDescriptor Context,
const std::string &Name,
DICompileUnit CompileUnit,
unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
uint64_t OffsetInBits,
unsigned Flags,
DIType DerivedFrom) {
Constant *Elts[] = {
GetTagConstant(Tag),
getCastToEmpty(Context),
GetStringConstant(Name),
getCastToEmpty(CompileUnit),
ConstantInt::get(Type::Int32Ty, LineNumber),
ConstantInt::get(Type::Int64Ty, SizeInBits),
ConstantInt::get(Type::Int64Ty, AlignInBits),
ConstantInt::get(Type::Int64Ty, OffsetInBits),
ConstantInt::get(Type::Int32Ty, Flags),
getCastToEmpty(DerivedFrom)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.derivedtype.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.derivedtype");
GV->setSection("llvm.metadata");
return DIDerivedType(GV);
}
/// CreateCompositeType - Create a composite type like array, struct, etc.
DICompositeType DIFactory::CreateCompositeType(unsigned Tag,
DIDescriptor Context,
const std::string &Name,
DICompileUnit CompileUnit,
unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
uint64_t OffsetInBits,
unsigned Flags,
DIType DerivedFrom,
DIArray Elements,
unsigned RuntimeLang) {
Constant *Elts[] = {
GetTagConstant(Tag),
getCastToEmpty(Context),
GetStringConstant(Name),
getCastToEmpty(CompileUnit),
ConstantInt::get(Type::Int32Ty, LineNumber),
ConstantInt::get(Type::Int64Ty, SizeInBits),
ConstantInt::get(Type::Int64Ty, AlignInBits),
ConstantInt::get(Type::Int64Ty, OffsetInBits),
ConstantInt::get(Type::Int32Ty, Flags),
getCastToEmpty(DerivedFrom),
getCastToEmpty(Elements),
ConstantInt::get(Type::Int32Ty, RuntimeLang)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.composite.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.composite");
GV->setSection("llvm.metadata");
return DICompositeType(GV);
}
/// CreateSubprogram - Create a new descriptor for the specified subprogram.
/// See comments in DISubprogram for descriptions of these fields. This
/// method does not unique the generated descriptors.
DISubprogram DIFactory::CreateSubprogram(DIDescriptor Context,
const std::string &Name,
const std::string &DisplayName,
const std::string &LinkageName,
DICompileUnit CompileUnit,
unsigned LineNo, DIType Type,
bool isLocalToUnit,
bool isDefinition) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_subprogram),
llvm::Constant::getNullValue(EmptyStructPtr),
getCastToEmpty(Context),
GetStringConstant(Name),
GetStringConstant(DisplayName),
GetStringConstant(LinkageName),
getCastToEmpty(CompileUnit),
ConstantInt::get(Type::Int32Ty, LineNo),
getCastToEmpty(Type),
ConstantInt::get(Type::Int1Ty, isLocalToUnit),
ConstantInt::get(Type::Int1Ty, isDefinition)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.subprogram.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::LinkOnceAnyLinkage,
Init, "llvm.dbg.subprogram");
GV->setSection("llvm.metadata");
return DISubprogram(GV);
}
/// CreateGlobalVariable - Create a new descriptor for the specified global.
DIGlobalVariable
DIFactory::CreateGlobalVariable(DIDescriptor Context, const std::string &Name,
const std::string &DisplayName,
const std::string &LinkageName,
DICompileUnit CompileUnit,
unsigned LineNo, DIType Type,bool isLocalToUnit,
bool isDefinition, llvm::GlobalVariable *Val) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_variable),
llvm::Constant::getNullValue(EmptyStructPtr),
getCastToEmpty(Context),
GetStringConstant(Name),
GetStringConstant(DisplayName),
GetStringConstant(LinkageName),
getCastToEmpty(CompileUnit),
ConstantInt::get(Type::Int32Ty, LineNo),
getCastToEmpty(Type),
ConstantInt::get(Type::Int1Ty, isLocalToUnit),
ConstantInt::get(Type::Int1Ty, isDefinition),
ConstantExpr::getBitCast(Val, EmptyStructPtr)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.global_variable.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::LinkOnceAnyLinkage,
Init, "llvm.dbg.global_variable");
GV->setSection("llvm.metadata");
return DIGlobalVariable(GV);
}
/// CreateVariable - Create a new descriptor for the specified variable.
DIVariable DIFactory::CreateVariable(unsigned Tag, DIDescriptor Context,
const std::string &Name,
DICompileUnit CompileUnit, unsigned LineNo,
DIType Type) {
Constant *Elts[] = {
GetTagConstant(Tag),
getCastToEmpty(Context),
GetStringConstant(Name),
getCastToEmpty(CompileUnit),
ConstantInt::get(Type::Int32Ty, LineNo),
getCastToEmpty(Type)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.variable.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.variable");
GV->setSection("llvm.metadata");
return DIVariable(GV);
}
/// CreateBlock - This creates a descriptor for a lexical block with the
/// specified parent VMContext.
DIBlock DIFactory::CreateBlock(DIDescriptor Context) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_lexical_block),
getCastToEmpty(Context)
};
Constant *Init = ConstantStruct::get(VMContext, Elts,
sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.block.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(M, Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.block");
GV->setSection("llvm.metadata");
return DIBlock(GV);
}
//===----------------------------------------------------------------------===//
// DIFactory: Routines for inserting code into a function
//===----------------------------------------------------------------------===//
/// InsertStopPoint - Create a new llvm.dbg.stoppoint intrinsic invocation,
/// inserting it at the end of the specified basic block.
void DIFactory::InsertStopPoint(DICompileUnit CU, unsigned LineNo,
unsigned ColNo, BasicBlock *BB) {
// Lazily construct llvm.dbg.stoppoint function.
if (!StopPointFn)
StopPointFn = llvm::Intrinsic::getDeclaration(&M,
llvm::Intrinsic::dbg_stoppoint);
// Invoke llvm.dbg.stoppoint
Value *Args[] = {
ConstantInt::get(llvm::Type::Int32Ty, LineNo),
ConstantInt::get(llvm::Type::Int32Ty, ColNo),
getCastToEmpty(CU)
};
CallInst::Create(StopPointFn, Args, Args+3, "", BB);
}
/// InsertSubprogramStart - Create a new llvm.dbg.func.start intrinsic to
/// mark the start of the specified subprogram.
void DIFactory::InsertSubprogramStart(DISubprogram SP, BasicBlock *BB) {
// Lazily construct llvm.dbg.func.start.
if (!FuncStartFn)
FuncStartFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_func_start);
// Call llvm.dbg.func.start which also implicitly sets a stoppoint.
CallInst::Create(FuncStartFn, getCastToEmpty(SP), "", BB);
}
/// InsertRegionStart - Insert a new llvm.dbg.region.start intrinsic call to
/// mark the start of a region for the specified scoping descriptor.
void DIFactory::InsertRegionStart(DIDescriptor D, BasicBlock *BB) {
// Lazily construct llvm.dbg.region.start function.
if (!RegionStartFn)
RegionStartFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_region_start);
// Call llvm.dbg.func.start.
CallInst::Create(RegionStartFn, getCastToEmpty(D), "", BB);
}
/// InsertRegionEnd - Insert a new llvm.dbg.region.end intrinsic call to
/// mark the end of a region for the specified scoping descriptor.
void DIFactory::InsertRegionEnd(DIDescriptor D, BasicBlock *BB) {
// Lazily construct llvm.dbg.region.end function.
if (!RegionEndFn)
RegionEndFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_region_end);
// Call llvm.dbg.region.end.
CallInst::Create(RegionEndFn, getCastToEmpty(D), "", BB);
}
/// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
void DIFactory::InsertDeclare(Value *Storage, DIVariable D, BasicBlock *BB) {
// Cast the storage to a {}* for the call to llvm.dbg.declare.
Storage = new BitCastInst(Storage, EmptyStructPtr, "", BB);
if (!DeclareFn)
DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
Value *Args[] = { Storage, getCastToEmpty(D) };
CallInst::Create(DeclareFn, Args, Args+2, "", BB);
}
//===----------------------------------------------------------------------===//
// DebugInfoFinder implementations.
//===----------------------------------------------------------------------===//
/// processModule - Process entire module and collect debug info.
void DebugInfoFinder::processModule(Module &M) {
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
for (Function::iterator FI = (*I).begin(), FE = (*I).end(); FI != FE; ++FI)
for (BasicBlock::iterator BI = (*FI).begin(), BE = (*FI).end(); BI != BE;
++BI) {
if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(BI))
processStopPoint(SPI);
else if (DbgFuncStartInst *FSI = dyn_cast<DbgFuncStartInst>(BI))
processFuncStart(FSI);
else if (DbgRegionStartInst *DRS = dyn_cast<DbgRegionStartInst>(BI))
processRegionStart(DRS);
else if (DbgRegionEndInst *DRE = dyn_cast<DbgRegionEndInst>(BI))
processRegionEnd(DRE);
else if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI))
processDeclare(DDI);
}
for (Module::global_iterator GVI = M.global_begin(), GVE = M.global_end();
GVI != GVE; ++GVI) {
GlobalVariable *GV = GVI;
if (!GV->hasName() || !GV->isConstant()
|| strcmp(GV->getName().data(), "llvm.dbg.global_variable")
|| !GV->hasInitializer())
continue;
DIGlobalVariable DIG(GV);
if (addGlobalVariable(DIG)) {
addCompileUnit(DIG.getCompileUnit());
processType(DIG.getType());
}
}
}
/// processType - Process DIType.
void DebugInfoFinder::processType(DIType DT) {
if (DT.isNull())
return;
if (!NodesSeen.insert(DT.getGV()))
return;
addCompileUnit(DT.getCompileUnit());
if (DT.isCompositeType(DT.getTag())) {
DICompositeType DCT(DT.getGV());
processType(DCT.getTypeDerivedFrom());
DIArray DA = DCT.getTypeArray();
if (!DA.isNull())
for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
DIDescriptor D = DA.getElement(i);
DIType TypeE = DIType(D.getGV());
if (!TypeE.isNull())
processType(TypeE);
else
processSubprogram(DISubprogram(D.getGV()));
}
} else if (DT.isDerivedType(DT.getTag())) {
DIDerivedType DDT(DT.getGV());
if (!DDT.isNull())
processType(DDT.getTypeDerivedFrom());
}
}
/// processSubprogram - Process DISubprogram.
void DebugInfoFinder::processSubprogram(DISubprogram SP) {
if (SP.isNull())
return;
if (!addSubprogram(SP))
return;
addCompileUnit(SP.getCompileUnit());
processType(SP.getType());
}
/// processStopPoint - Process DbgStopPointInst.
void DebugInfoFinder::processStopPoint(DbgStopPointInst *SPI) {
GlobalVariable *Context = dyn_cast<GlobalVariable>(SPI->getContext());
addCompileUnit(DICompileUnit(Context));
}
/// processFuncStart - Process DbgFuncStartInst.
void DebugInfoFinder::processFuncStart(DbgFuncStartInst *FSI) {
GlobalVariable *SP = dyn_cast<GlobalVariable>(FSI->getSubprogram());
processSubprogram(DISubprogram(SP));
}
/// processRegionStart - Process DbgRegionStart.
void DebugInfoFinder::processRegionStart(DbgRegionStartInst *DRS) {
GlobalVariable *SP = dyn_cast<GlobalVariable>(DRS->getContext());
processSubprogram(DISubprogram(SP));
}
/// processRegionEnd - Process DbgRegionEnd.
void DebugInfoFinder::processRegionEnd(DbgRegionEndInst *DRE) {
GlobalVariable *SP = dyn_cast<GlobalVariable>(DRE->getContext());
processSubprogram(DISubprogram(SP));
}
/// processDeclare - Process DbgDeclareInst.
void DebugInfoFinder::processDeclare(DbgDeclareInst *DDI) {
DIVariable DV(cast<GlobalVariable>(DDI->getVariable()));
if (DV.isNull())
return;
if (!NodesSeen.insert(DV.getGV()))
return;
addCompileUnit(DV.getCompileUnit());
processType(DV.getType());
}
/// addCompileUnit - Add compile unit into CUs.
bool DebugInfoFinder::addCompileUnit(DICompileUnit CU) {
if (CU.isNull())
return false;
if (!NodesSeen.insert(CU.getGV()))
return false;
CUs.push_back(CU.getGV());
return true;
}
/// addGlobalVariable - Add global variable into GVs.
bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable DIG) {
if (DIG.isNull())
return false;
if (!NodesSeen.insert(DIG.getGV()))
return false;
GVs.push_back(DIG.getGV());
return true;
}
// addSubprogram - Add subprgoram into SPs.
bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
if (SP.isNull())
return false;
if (!NodesSeen.insert(SP.getGV()))
return false;
SPs.push_back(SP.getGV());
return true;
}
namespace llvm {
/// findStopPoint - Find the stoppoint coressponding to this instruction, that
/// is the stoppoint that dominates this instruction.
const DbgStopPointInst *findStopPoint(const Instruction *Inst) {
if (const DbgStopPointInst *DSI = dyn_cast<DbgStopPointInst>(Inst))
return DSI;
const BasicBlock *BB = Inst->getParent();
BasicBlock::const_iterator I = Inst, B;
while (BB) {
B = BB->begin();
// A BB consisting only of a terminator can't have a stoppoint.
while (I != B) {
--I;
if (const DbgStopPointInst *DSI = dyn_cast<DbgStopPointInst>(I))
return DSI;
}
// This BB didn't have a stoppoint: if there is only one predecessor, look
// for a stoppoint there. We could use getIDom(), but that would require
// dominator info.
BB = I->getParent()->getUniquePredecessor();
if (BB)
I = BB->getTerminator();
}
return 0;
}
/// findBBStopPoint - Find the stoppoint corresponding to first real
/// (non-debug intrinsic) instruction in this Basic Block, and return the
/// stoppoint for it.
const DbgStopPointInst *findBBStopPoint(const BasicBlock *BB) {
for(BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (const DbgStopPointInst *DSI = dyn_cast<DbgStopPointInst>(I))
return DSI;
// Fallback to looking for stoppoint of unique predecessor. Useful if this
// BB contains no stoppoints, but unique predecessor does.
BB = BB->getUniquePredecessor();
if (BB)
return findStopPoint(BB->getTerminator());
return 0;
}
Value *findDbgGlobalDeclare(GlobalVariable *V) {
const Module *M = V->getParent();
const Type *Ty = M->getTypeByName("llvm.dbg.global_variable.type");
if (!Ty) return 0;
Ty = PointerType::get(Ty, 0);
Value *Val = V->stripPointerCasts();
for (Value::use_iterator I = Val->use_begin(), E = Val->use_end();
I != E; ++I) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(I)) {
if (CE->getOpcode() == Instruction::BitCast) {
Value *VV = CE;
while (VV->hasOneUse())
VV = *VV->use_begin();
if (VV->getType() == Ty)
return VV;
}
}
}
if (Val->getType() == Ty)
return Val;
return 0;
}
/// Finds the llvm.dbg.declare intrinsic corresponding to this value if any.
/// It looks through pointer casts too.
const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts) {
if (stripCasts) {
V = V->stripPointerCasts();
// Look for the bitcast.
for (Value::use_const_iterator I = V->use_begin(), E =V->use_end();
I != E; ++I)
if (isa<BitCastInst>(I))
return findDbgDeclare(*I, false);
return 0;
}
// Find llvm.dbg.declare among uses of the instruction.
for (Value::use_const_iterator I = V->use_begin(), E =V->use_end();
I != E; ++I)
if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I))
return DDI;
return 0;
}
bool getLocationInfo(const Value *V, std::string &DisplayName,
std::string &Type, unsigned &LineNo, std::string &File,
std::string &Dir) {
DICompileUnit Unit;
DIType TypeD;
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(const_cast<Value*>(V))) {
Value *DIGV = findDbgGlobalDeclare(GV);
if (!DIGV) return false;
DIGlobalVariable Var(cast<GlobalVariable>(DIGV));
Var.getDisplayName(DisplayName);
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
} else {
const DbgDeclareInst *DDI = findDbgDeclare(V);
if (!DDI) return false;
DIVariable Var(cast<GlobalVariable>(DDI->getVariable()));
Var.getName(DisplayName);
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
}
TypeD.getName(Type);
Unit.getFilename(File);
Unit.getDirectory(Dir);
return true;
}
/// isValidDebugInfoIntrinsic - Return true if SPI is a valid debug
/// info intrinsic.
bool isValidDebugInfoIntrinsic(DbgStopPointInst &SPI,
CodeGenOpt::Level OptLev) {
return DIDescriptor::ValidDebugInfo(SPI.getContext(), OptLev);
}
/// isValidDebugInfoIntrinsic - Return true if FSI is a valid debug
/// info intrinsic.
bool isValidDebugInfoIntrinsic(DbgFuncStartInst &FSI,
CodeGenOpt::Level OptLev) {
return DIDescriptor::ValidDebugInfo(FSI.getSubprogram(), OptLev);
}
/// isValidDebugInfoIntrinsic - Return true if RSI is a valid debug
/// info intrinsic.
bool isValidDebugInfoIntrinsic(DbgRegionStartInst &RSI,
CodeGenOpt::Level OptLev) {
return DIDescriptor::ValidDebugInfo(RSI.getContext(), OptLev);
}
/// isValidDebugInfoIntrinsic - Return true if REI is a valid debug
/// info intrinsic.
bool isValidDebugInfoIntrinsic(DbgRegionEndInst &REI,
CodeGenOpt::Level OptLev) {
return DIDescriptor::ValidDebugInfo(REI.getContext(), OptLev);
}
/// isValidDebugInfoIntrinsic - Return true if DI is a valid debug
/// info intrinsic.
bool isValidDebugInfoIntrinsic(DbgDeclareInst &DI,
CodeGenOpt::Level OptLev) {
return DIDescriptor::ValidDebugInfo(DI.getVariable(), OptLev);
}
/// ExtractDebugLocation - Extract debug location information
/// from llvm.dbg.stoppoint intrinsic.
DebugLoc ExtractDebugLocation(DbgStopPointInst &SPI,
DebugLocTracker &DebugLocInfo) {
DebugLoc DL;
Value *Context = SPI.getContext();
// If this location is already tracked then use it.
DebugLocTuple Tuple(cast<GlobalVariable>(Context), SPI.getLine(),
SPI.getColumn());
DenseMap<DebugLocTuple, unsigned>::iterator II
= DebugLocInfo.DebugIdMap.find(Tuple);
if (II != DebugLocInfo.DebugIdMap.end())
return DebugLoc::get(II->second);
// Add a new location entry.
unsigned Id = DebugLocInfo.DebugLocations.size();
DebugLocInfo.DebugLocations.push_back(Tuple);
DebugLocInfo.DebugIdMap[Tuple] = Id;
return DebugLoc::get(Id);
}
/// ExtractDebugLocation - Extract debug location information
/// from llvm.dbg.func_start intrinsic.
DebugLoc ExtractDebugLocation(DbgFuncStartInst &FSI,
DebugLocTracker &DebugLocInfo) {
DebugLoc DL;
Value *SP = FSI.getSubprogram();
DISubprogram Subprogram(cast<GlobalVariable>(SP));
unsigned Line = Subprogram.getLineNumber();
DICompileUnit CU(Subprogram.getCompileUnit());
// If this location is already tracked then use it.
DebugLocTuple Tuple(CU.getGV(), Line, /* Column */ 0);
DenseMap<DebugLocTuple, unsigned>::iterator II
= DebugLocInfo.DebugIdMap.find(Tuple);
if (II != DebugLocInfo.DebugIdMap.end())
return DebugLoc::get(II->second);
// Add a new location entry.
unsigned Id = DebugLocInfo.DebugLocations.size();
DebugLocInfo.DebugLocations.push_back(Tuple);
DebugLocInfo.DebugIdMap[Tuple] = Id;
return DebugLoc::get(Id);
}
/// isInlinedFnStart - Return true if FSI is starting an inlined function.
bool isInlinedFnStart(DbgFuncStartInst &FSI, const Function *CurrentFn) {
DISubprogram Subprogram(cast<GlobalVariable>(FSI.getSubprogram()));
if (Subprogram.describes(CurrentFn))
return false;
return true;
}
/// isInlinedFnEnd - Return true if REI is ending an inlined function.
bool isInlinedFnEnd(DbgRegionEndInst &REI, const Function *CurrentFn) {
DISubprogram Subprogram(cast<GlobalVariable>(REI.getContext()));
if (Subprogram.isNull() || Subprogram.describes(CurrentFn))
return false;
return true;
}
}
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