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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/ADT/SmallPtrSet.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/DebugLoc.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::dwarf;
//===----------------------------------------------------------------------===//
// DIDescriptor
//===----------------------------------------------------------------------===//
/// ValidDebugInfo - Return true if V represents valid debug info value.
/// FIXME : Add DIDescriptor.isValid()
bool DIDescriptor::ValidDebugInfo(MDNode *N, CodeGenOpt::Level OptLevel) {
if (!N)
return false;
DIDescriptor DI(N);
// 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(N).Verify() && "Invalid DebugInfo value");
break;
case DW_TAG_compile_unit:
assert(DICompileUnit(N).Verify() && "Invalid DebugInfo value");
break;
case DW_TAG_subprogram:
assert(DISubprogram(N).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(MDNode *N, unsigned RequiredTag) {
DbgNode = N;
// If this is non-null, check to see if the Tag matches. If not, set to null.
if (N && getTag() != RequiredTag) {
DbgNode = 0;
}
}
const std::string &
DIDescriptor::getStringField(unsigned Elt, std::string &Result) const {
Result.clear();
if (DbgNode == 0)
return Result;
if (Elt < DbgNode->getNumElements())
if (MDString *MDS = dyn_cast_or_null<MDString>(DbgNode->getElement(Elt))) {
Result.assign(MDS->begin(), MDS->begin() + MDS->length());
return Result;
}
return Result;
}
uint64_t DIDescriptor::getUInt64Field(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumElements())
if (ConstantInt *CI = dyn_cast<ConstantInt>(DbgNode->getElement(Elt)))
return CI->getZExtValue();
return 0;
}
DIDescriptor DIDescriptor::getDescriptorField(unsigned Elt) const {
if (DbgNode == 0)
return DIDescriptor();
if (Elt < DbgNode->getNumElements() && DbgNode->getElement(Elt))
return DIDescriptor(dyn_cast<MDNode>(DbgNode->getElement(Elt)));
return DIDescriptor();
}
GlobalVariable *DIDescriptor::getGlobalVariableField(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumElements())
return dyn_cast<GlobalVariable>(DbgNode->getElement(Elt));
return 0;
}
//===----------------------------------------------------------------------===//
// Simple Descriptor Constructors and other Methods
//===----------------------------------------------------------------------===//
// Needed by DIVariable::getType().
DIType::DIType(MDNode *N) : DIDescriptor(N) {
if (!N) return;
unsigned tag = getTag();
if (tag != dwarf::DW_TAG_base_type && !DIDerivedType::isDerivedType(tag) &&
!DICompositeType::isCompositeType(tag)) {
DbgNode = 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:
// CompositeTypes are currently modelled as DerivedTypes.
return isCompositeType(Tag);
}
}
/// 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 (DbgNode && "Invalid DIArray");
return DbgNode->getNumElements();
}
/// 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");
DbgNode->replaceAllUsesWith(D.getNode());
delete DbgNode;
}
/// 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 {
errs() << "[" << dwarf::TagString(getTag()) << "] ";
errs().write_hex((intptr_t)DbgNode) << ']';
}
/// dump - Print compile unit.
void DICompileUnit::dump() const {
if (getLanguage())
errs() << " [" << dwarf::LanguageString(getLanguage()) << "] ";
std::string Res1, Res2;
errs() << " [" << getDirectory(Res1) << "/" << getFilename(Res2) << " ]";
}
/// dump - Print type.
void DIType::dump() const {
if (isNull()) return;
std::string Res;
if (!getName(Res).empty())
errs() << " [" << Res << "] ";
unsigned Tag = getTag();
errs() << " [" << dwarf::TagString(Tag) << "] ";
// TODO : Print context
getCompileUnit().dump();
errs() << " ["
<< getLineNumber() << ", "
<< getSizeInBits() << ", "
<< getAlignInBits() << ", "
<< getOffsetInBits()
<< "] ";
if (isPrivate())
errs() << " [private] ";
else if (isProtected())
errs() << " [protected] ";
if (isForwardDecl())
errs() << " [fwd] ";
if (isBasicType(Tag))
DIBasicType(DbgNode).dump();
else if (isDerivedType(Tag))
DIDerivedType(DbgNode).dump();
else if (isCompositeType(Tag))
DICompositeType(DbgNode).dump();
else {
errs() << "Invalid DIType\n";
return;
}
errs() << "\n";
}
/// dump - Print basic type.
void DIBasicType::dump() const {
errs() << " [" << dwarf::AttributeEncodingString(getEncoding()) << "] ";
}
/// dump - Print derived type.
void DIDerivedType::dump() const {
errs() << "\n\t Derived From: "; getTypeDerivedFrom().dump();
}
/// dump - Print composite type.
void DICompositeType::dump() const {
DIArray A = getTypeArray();
if (A.isNull())
return;
errs() << " [" << A.getNumElements() << " elements]";
}
/// dump - Print global.
void DIGlobal::dump() const {
std::string Res;
if (!getName(Res).empty())
errs() << " [" << Res << "] ";
unsigned Tag = getTag();
errs() << " [" << dwarf::TagString(Tag) << "] ";
// TODO : Print context
getCompileUnit().dump();
errs() << " [" << getLineNumber() << "] ";
if (isLocalToUnit())
errs() << " [local] ";
if (isDefinition())
errs() << " [def] ";
if (isGlobalVariable(Tag))
DIGlobalVariable(DbgNode).dump();
errs() << "\n";
}
/// dump - Print subprogram.
void DISubprogram::dump() const {
DIGlobal::dump();
}
/// dump - Print global variable.
void DIGlobalVariable::dump() const {
errs() << " [";
getGlobal()->dump();
errs() << "] ";
}
/// dump - Print variable.
void DIVariable::dump() const {
std::string Res;
if (!getName(Res).empty())
errs() << " [" << Res << "] ";
getCompileUnit().dump();
errs() << " [" << getLineNumber() << "] ";
getType().dump();
errs() << "\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));
}
Constant *DIFactory::GetTagConstant(unsigned TAG) {
assert((TAG & LLVMDebugVersionMask) == 0 &&
"Tag too large for debug encoding!");
return ConstantInt::get(Type::getInt32Ty(VMContext), TAG | LLVMDebugVersion);
}
//===----------------------------------------------------------------------===//
// 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<Value*, 16> Elts;
if (NumTys == 0)
Elts.push_back(llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)));
else
for (unsigned i = 0; i != NumTys; ++i)
Elts.push_back(Tys[i].getNode());
return DIArray(MDNode::get(VMContext,Elts.data(), Elts.size()));
}
/// GetOrCreateSubrange - Create a descriptor for a value range. This
/// implicitly uniques the values returned.
DISubrange DIFactory::GetOrCreateSubrange(int64_t Lo, int64_t Hi) {
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_subrange_type),
ConstantInt::get(Type::getInt64Ty(VMContext), Lo),
ConstantInt::get(Type::getInt64Ty(VMContext), Hi)
};
return DISubrange(MDNode::get(VMContext, &Elts[0], 3));
}
/// 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) {
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_compile_unit),
llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),
ConstantInt::get(Type::getInt32Ty(VMContext), LangID),
MDString::get(VMContext, Filename),
MDString::get(VMContext, Directory),
MDString::get(VMContext, Producer),
ConstantInt::get(Type::getInt1Ty(VMContext), isMain),
ConstantInt::get(Type::getInt1Ty(VMContext), isOptimized),
MDString::get(VMContext, Flags),
ConstantInt::get(Type::getInt32Ty(VMContext), RunTimeVer)
};
return DICompileUnit(MDNode::get(VMContext, &Elts[0], 10));
}
/// CreateEnumerator - Create a single enumerator value.
DIEnumerator DIFactory::CreateEnumerator(const std::string &Name, uint64_t Val){
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_enumerator),
MDString::get(VMContext, Name),
ConstantInt::get(Type::getInt64Ty(VMContext), Val)
};
return DIEnumerator(MDNode::get(VMContext, &Elts[0], 3));
}
/// 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) {
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_base_type),
Context.getNode(),
MDString::get(VMContext, Name),
CompileUnit.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), OffsetInBits),
ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
ConstantInt::get(Type::getInt32Ty(VMContext), Encoding)
};
return DIBasicType(MDNode::get(VMContext, &Elts[0], 10));
}
/// 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) {
Value *Elts[] = {
GetTagConstant(Tag),
Context.getNode(),
MDString::get(VMContext, Name),
CompileUnit.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), OffsetInBits),
ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
DerivedFrom.getNode(),
};
return DIDerivedType(MDNode::get(VMContext, &Elts[0], 10));
}
/// 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) {
Value *Elts[] = {
GetTagConstant(Tag),
Context.getNode(),
MDString::get(VMContext, Name),
CompileUnit.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), OffsetInBits),
ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
DerivedFrom.getNode(),
Elements.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), RuntimeLang)
};
return DICompositeType(MDNode::get(VMContext, &Elts[0], 12));
}
/// 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) {
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_subprogram),
llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),
Context.getNode(),
MDString::get(VMContext, Name),
MDString::get(VMContext, DisplayName),
MDString::get(VMContext, LinkageName),
CompileUnit.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
Type.getNode(),
ConstantInt::get(Type::getInt1Ty(VMContext), isLocalToUnit),
ConstantInt::get(Type::getInt1Ty(VMContext), isDefinition)
};
return DISubprogram(MDNode::get(VMContext, &Elts[0], 11));
}
/// 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) {
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_variable),
llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),
Context.getNode(),
MDString::get(VMContext, Name),
MDString::get(VMContext, DisplayName),
MDString::get(VMContext, LinkageName),
CompileUnit.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
Type.getNode(),
ConstantInt::get(Type::getInt1Ty(VMContext), isLocalToUnit),
ConstantInt::get(Type::getInt1Ty(VMContext), isDefinition),
Val
};
Value *const *Vs = &Elts[0];
MDNode *Node = MDNode::get(VMContext,Vs, 12);
// Create a named metadata so that we do not lose this mdnode.
NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.gv");
NMD->addElement(Node);
return DIGlobalVariable(Node);
}
/// 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) {
Value *Elts[] = {
GetTagConstant(Tag),
Context.getNode(),
MDString::get(VMContext, Name),
CompileUnit.getNode(),
ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
Type.getNode(),
};
return DIVariable(MDNode::get(VMContext, &Elts[0], 6));
}
/// CreateBlock - This creates a descriptor for a lexical block with the
/// specified parent VMContext.
DIBlock DIFactory::CreateBlock(DIDescriptor Context) {
Value *Elts[] = {
GetTagConstant(dwarf::DW_TAG_lexical_block),
Context.getNode()
};
return DIBlock(MDNode::get(VMContext, &Elts[0], 2));
}
//===----------------------------------------------------------------------===//
// 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::getInt32Ty(VMContext), LineNo),
ConstantInt::get(llvm::Type::getInt32Ty(VMContext), ColNo),
CU.getNode()
};
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, SP.getNode(), "", 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, D.getNode(), "", 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, D.getNode(), "", 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, D.getNode() };
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);
}
NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.gv");
if (!NMD)
return;
for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
DIGlobalVariable DIG(cast<MDNode>(NMD->getElement(i)));
if (addGlobalVariable(DIG)) {
addCompileUnit(DIG.getCompileUnit());
processType(DIG.getType());
}
}
}
/// processType - Process DIType.
void DebugInfoFinder::processType(DIType DT) {
if (!addType(DT))
return;
addCompileUnit(DT.getCompileUnit());
if (DT.isCompositeType(DT.getTag())) {
DICompositeType DCT(DT.getNode());
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.getNode());
if (!TypeE.isNull())
processType(TypeE);
else
processSubprogram(DISubprogram(D.getNode()));
}
} else if (DT.isDerivedType(DT.getTag())) {
DIDerivedType DDT(DT.getNode());
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) {
MDNode *Context = dyn_cast<MDNode>(SPI->getContext());
addCompileUnit(DICompileUnit(Context));
}
/// processFuncStart - Process DbgFuncStartInst.
void DebugInfoFinder::processFuncStart(DbgFuncStartInst *FSI) {
MDNode *SP = dyn_cast<MDNode>(FSI->getSubprogram());
processSubprogram(DISubprogram(SP));
}
/// processRegionStart - Process DbgRegionStart.
void DebugInfoFinder::processRegionStart(DbgRegionStartInst *DRS) {
MDNode *SP = dyn_cast<MDNode>(DRS->getContext());
processSubprogram(DISubprogram(SP));
}
/// processRegionEnd - Process DbgRegionEnd.
void DebugInfoFinder::processRegionEnd(DbgRegionEndInst *DRE) {
MDNode *SP = dyn_cast<MDNode>(DRE->getContext());
processSubprogram(DISubprogram(SP));
}
/// processDeclare - Process DbgDeclareInst.
void DebugInfoFinder::processDeclare(DbgDeclareInst *DDI) {
DIVariable DV(cast<MDNode>(DDI->getVariable()));
if (DV.isNull())
return;
if (!NodesSeen.insert(DV.getNode()))
return;
addCompileUnit(DV.getCompileUnit());
processType(DV.getType());
}
/// addType - Add type into Tys.
bool DebugInfoFinder::addType(DIType DT) {
if (DT.isNull())
return false;
if (!NodesSeen.insert(DT.getNode()))
return false;
TYs.push_back(DT.getNode());
return true;
}
/// addCompileUnit - Add compile unit into CUs.
bool DebugInfoFinder::addCompileUnit(DICompileUnit CU) {
if (CU.isNull())
return false;
if (!NodesSeen.insert(CU.getNode()))
return false;
CUs.push_back(CU.getNode());
return true;
}
/// addGlobalVariable - Add global variable into GVs.
bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable DIG) {
if (DIG.isNull())
return false;
if (!NodesSeen.insert(DIG.getNode()))
return false;
GVs.push_back(DIG.getNode());
return true;
}
// addSubprogram - Add subprgoram into SPs.
bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
if (SP.isNull())
return false;
if (!NodesSeen.insert(SP.getNode()))
return false;
SPs.push_back(SP.getNode());
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();
NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.gv");
if (!NMD)
return 0;
for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
DIGlobalVariable DIG(cast_or_null<MDNode>(NMD->getElement(i)));
if (DIG.isNull())
continue;
if (DIG.getGlobal() == V)
return DIG.getNode();
}
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<MDNode>(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<MDNode>(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<MDNode>(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<MDNode>(SP));
unsigned Line = Subprogram.getLineNumber();
DICompileUnit CU(Subprogram.getCompileUnit());
// If this location is already tracked then use it.
DebugLocTuple Tuple(CU.getNode(), 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<MDNode>(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<MDNode>(REI.getContext()));
if (Subprogram.isNull() || Subprogram.describes(CurrentFn))
return false;
return true;
}
}
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