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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/Module.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/Dwarf.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 when
/// during optimization.
if (OptLevel != CodeGenOpt::None)
return false;
default:
break;
}
return true;
}
DIDescriptor::DIDescriptor(GlobalVariable *gv, unsigned RequiredTag) {
GV = gv;
// If this is non-null, check to see if the Tag matches. If not, set to null.
if (GV && getTag() != RequiredTag)
GV = 0;
}
const std::string &
DIDescriptor::getStringField(unsigned Elt, std::string &Result) const {
if (GV == 0) {
Result.clear();
return Result;
}
Constant *C = GV->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 (GV == 0) return 0;
Constant *C = GV->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 (GV == 0) return DIDescriptor();
Constant *C = GV->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 (GV == 0) return 0;
Constant *C = GV->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
//===----------------------------------------------------------------------===//
DIAnchor::DIAnchor(GlobalVariable *GV)
: DIDescriptor(GV, dwarf::DW_TAG_anchor) {}
DIEnumerator::DIEnumerator(GlobalVariable *GV)
: DIDescriptor(GV, dwarf::DW_TAG_enumerator) {}
DISubrange::DISubrange(GlobalVariable *GV)
: DIDescriptor(GV, dwarf::DW_TAG_subrange_type) {}
DICompileUnit::DICompileUnit(GlobalVariable *GV)
: DIDescriptor(GV, dwarf::DW_TAG_compile_unit) {}
DIBasicType::DIBasicType(GlobalVariable *GV)
: DIType(GV, dwarf::DW_TAG_base_type) {}
DISubprogram::DISubprogram(GlobalVariable *GV)
: DIGlobal(GV, dwarf::DW_TAG_subprogram) {}
DIGlobalVariable::DIGlobalVariable(GlobalVariable *GV)
: DIGlobal(GV, dwarf::DW_TAG_variable) {}
DIBlock::DIBlock(GlobalVariable *GV)
: DIDescriptor(GV, dwarf::DW_TAG_lexical_block) {}
// 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))
GV = 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;
}
}
DIDerivedType::DIDerivedType(GlobalVariable *GV) : DIType(GV, true, true) {
if (GV && !isDerivedType(getTag()))
GV = 0;
}
/// 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;
}
}
DICompositeType::DICompositeType(GlobalVariable *GV)
: DIDerivedType(GV, true, true) {
if (GV && !isCompositeType(getTag()))
GV = 0;
}
/// 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;
}
}
DIVariable::DIVariable(GlobalVariable *gv) : DIDescriptor(gv) {
if (gv && !isVariable(getTag()))
GV = 0;
}
unsigned DIArray::getNumElements() const {
assert (GV && "Invalid DIArray");
Constant *C = GV->getInitializer();
assert (C && "Invalid DIArray initializer");
return C->getNumOperands();
}
/// 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 (!Name.empty() && (strcmp(Name.c_str(), F->getNameStart()) == false))
return true;
return false;
}
//===----------------------------------------------------------------------===//
// DIFactory: Basic Helpers
//===----------------------------------------------------------------------===//
DIFactory::DIFactory(Module &m) : M(m) {
StopPointFn = FuncStartFn = RegionStartFn = RegionEndFn = DeclareFn = 0;
EmptyStructPtr = PointerType::getUnqual(StructType::get(NULL, NULL));
}
/// 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 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 sbyte* 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(ConstStr->getType(), true,
GlobalVariable::InternalLinkage,
ConstStr, ".str", &M);
StrGV->setSection("llvm.metadata");
return Slot = ConstantExpr::getBitCast(StrGV, DestTy);
}
/// GetOrCreateAnchor - Look up an anchor for the specified tag and name. If it
/// already exists, return it. If not, create a new one and return it.
DIAnchor DIFactory::GetOrCreateAnchor(unsigned TAG, const char *Name) {
const Type *EltTy = StructType::get(Type::Int32Ty, Type::Int32Ty, NULL);
// Otherwise, create the global or return it if already in the module.
Constant *C = M.getOrInsertGlobal(Name, EltTy);
assert(isa<GlobalVariable>(C) && "Incorrectly typed anchor?");
GlobalVariable *GV = cast<GlobalVariable>(C);
// If it has an initializer, it is already in the module.
if (GV->hasInitializer())
return SubProgramAnchor = DIAnchor(GV);
GV->setLinkage(GlobalValue::LinkOnceAnyLinkage);
GV->setSection("llvm.metadata");
GV->setConstant(true);
M.addTypeName("llvm.dbg.anchor.type", EltTy);
// Otherwise, set the initializer.
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_anchor),
ConstantInt::get(Type::Int32Ty, TAG)
};
GV->setInitializer(ConstantStruct::get(Elts, 2));
return DIAnchor(GV);
}
//===----------------------------------------------------------------------===//
// DIFactory: Primary Constructors
//===----------------------------------------------------------------------===//
/// GetOrCreateCompileUnitAnchor - Return the anchor for compile units,
/// creating a new one if there isn't already one in the module.
DIAnchor DIFactory::GetOrCreateCompileUnitAnchor() {
// If we already created one, just return it.
if (!CompileUnitAnchor.isNull())
return CompileUnitAnchor;
return CompileUnitAnchor = GetOrCreateAnchor(dwarf::DW_TAG_compile_unit,
"llvm.dbg.compile_units");
}
/// GetOrCreateSubprogramAnchor - Return the anchor for subprograms,
/// creating a new one if there isn't already one in the module.
DIAnchor DIFactory::GetOrCreateSubprogramAnchor() {
// If we already created one, just return it.
if (!SubProgramAnchor.isNull())
return SubProgramAnchor;
return SubProgramAnchor = GetOrCreateAnchor(dwarf::DW_TAG_subprogram,
"llvm.dbg.subprograms");
}
/// GetOrCreateGlobalVariableAnchor - Return the anchor for globals,
/// creating a new one if there isn't already one in the module.
DIAnchor DIFactory::GetOrCreateGlobalVariableAnchor() {
// If we already created one, just return it.
if (!GlobalVariableAnchor.isNull())
return GlobalVariableAnchor;
return GlobalVariableAnchor = GetOrCreateAnchor(dwarf::DW_TAG_variable,
"llvm.dbg.global_variables");
}
/// 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[0], 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(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.array", &M);
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(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(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.subrange", &M);
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),
getCastToEmpty(GetOrCreateCompileUnitAnchor()),
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.compile_unit.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.compile_unit", &M);
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.enumerator.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.enumerator", &M);
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.basictype.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.basictype", &M);
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.derivedtype.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.derivedtype", &M);
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.composite.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.composite", &M);
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),
getCastToEmpty(GetOrCreateSubprogramAnchor()),
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.subprogram.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.subprogram", &M);
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),
getCastToEmpty(GetOrCreateGlobalVariableAnchor()),
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.global_variable.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.global_variable", &M);
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(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.variable.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.variable", &M);
GV->setSection("llvm.metadata");
return DIVariable(GV);
}
/// CreateBlock - This creates a descriptor for a lexical block with the
/// specified parent context.
DIBlock DIFactory::CreateBlock(DIDescriptor Context) {
Constant *Elts[] = {
GetTagConstant(dwarf::DW_TAG_lexical_block),
getCastToEmpty(Context)
};
Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
M.addTypeName("llvm.dbg.block.type", Init->getType());
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalValue::InternalLinkage,
Init, "llvm.dbg.block", &M);
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[] = {
llvm::ConstantInt::get(llvm::Type::Int32Ty, LineNo),
llvm::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 = llvm::Intrinsic::getDeclaration(&M,
llvm::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 = llvm::Intrinsic::getDeclaration(&M,
llvm::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 = llvm::Intrinsic::getDeclaration(&M,
llvm::Intrinsic::dbg_region_end);
CallInst::Create(RegionEndFn, getCastToEmpty(D), "", BB);
}
/// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
void DIFactory::InsertDeclare(llvm::Value *Storage, DIVariable D,
BasicBlock *BB) {
// Cast the storage to a {}* for the call to llvm.dbg.declare.
Storage = new llvm::BitCastInst(Storage, EmptyStructPtr, "", BB);
if (!DeclareFn)
DeclareFn = llvm::Intrinsic::getDeclaration(&M,
llvm::Intrinsic::dbg_declare);
Value *Args[] = { Storage, getCastToEmpty(D) };
CallInst::Create(DeclareFn, Args, Args+2, "", BB);
}
namespace llvm {
/// Finds 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;
do {
B = BB->begin();
// A BB consisting only of a terminator can't have a stoppoint.
if (I != B) {
do {
--I;
if (const DbgStopPointInst *DSI = dyn_cast<DbgStopPointInst>(I))
return DSI;
} while (I != B);
}
// 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();
} while (BB != 0);
return 0;
}
/// Finds the stoppoint corresponding to first real (non-debug intrinsic)
/// instruction in this Basic Block, and returns 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 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 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;
}
}
/// dump - print descriptor.
void DIDescriptor::dump() const {
cerr << " [" << dwarf::TagString(getTag()) << "]\n";
}
/// 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(GV).dump();
else if (isDerivedType(Tag))
DIDerivedType(GV).dump();
else if (isCompositeType(Tag))
DICompositeType(GV).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(GV).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";
}
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