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information output. However, many target specific tool chains prefer to encode only one compile unit in an object file. In this situation, the LLVM code generator will include debugging information entities in the compile unit that is marked as main compile unit. The code generator accepts maximum one main compile unit per module. If a module does not contain any main compile unit then the code generator will emit multiple compile units in the output object file. [Part 1] Update DebugInfo APIs to accept optional boolean value while creating DICompileUnit to mark the unit as "main" unit. By defaults all units are considered non-main. Update SourceLevelDebugging.html to document "main" compile unit. Update DebugInfo APIs to not accept and encode separate source file/directory entries while creating various llvm.dbg.* entities. There was a recent, yet to be documented, change to include this additional information so no documentation changes are required here. Update DwarfDebug to handle "main" compile unit. If "main" compile unit is seen then all DIEs are inserted into "main" compile unit. All other compile units are used to find source location for llvm.dbg.* values. If there is not any "main" compile unit then create unique compile unit DIEs for each llvm.dbg.compile_unit. [Part 2] Create separate llvm.dbg.compile_unit for each input file. Mark compile unit create for main_input_filename as "main" compile unit. Use appropriate compile unit, based on source location information collected from the tree node, while creating llvm.dbg.* values using DebugInfo APIs. --- This is Part 1. llvm-svn: 63400
485 lines
19 KiB
C++
485 lines
19 KiB
C++
//===--- llvm/Analysis/DebugInfo.h - Debug Information Helpers --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a bunch of datatypes that are useful for creating and
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// walking debug info in LLVM IR form.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_DEBUGINFO_H
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#define LLVM_ANALYSIS_DEBUGINFO_H
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/Dwarf.h"
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namespace llvm {
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class BasicBlock;
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class Constant;
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class Function;
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class GlobalVariable;
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class Module;
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class Type;
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class Value;
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class DbgStopPointInst;
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class DbgDeclareInst;
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class Instruction;
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class DIDescriptor {
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protected:
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GlobalVariable *GV;
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/// DIDescriptor constructor. If the specified GV is non-null, this checks
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/// to make sure that the tag in the descriptor matches 'RequiredTag'. If
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/// not, the debug info is corrupt and we ignore it.
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DIDescriptor(GlobalVariable *GV, unsigned RequiredTag);
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std::string getStringField(unsigned Elt) const;
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unsigned getUnsignedField(unsigned Elt) const {
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return (unsigned)getUInt64Field(Elt);
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}
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uint64_t getUInt64Field(unsigned Elt) const;
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DIDescriptor getDescriptorField(unsigned Elt) const;
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template <typename DescTy>
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DescTy getFieldAs(unsigned Elt) const {
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return DescTy(getDescriptorField(Elt).getGV());
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}
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GlobalVariable *getGlobalVariableField(unsigned Elt) const;
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public:
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explicit DIDescriptor() : GV(0) {}
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explicit DIDescriptor(GlobalVariable *gv) : GV(gv) {}
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bool isNull() const { return GV == 0; }
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GlobalVariable *getGV() const { return GV; }
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unsigned getVersion() const {
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return getUnsignedField(0) & LLVMDebugVersionMask;
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}
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unsigned getTag() const {
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return getUnsignedField(0) & ~LLVMDebugVersionMask;
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}
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};
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/// DIAnchor - A wrapper for various anchor descriptors.
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class DIAnchor : public DIDescriptor {
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public:
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explicit DIAnchor(GlobalVariable *GV = 0);
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unsigned getAnchorTag() const { return getUnsignedField(1); }
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};
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/// DISubrange - This is used to represent ranges, for array bounds.
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class DISubrange : public DIDescriptor {
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public:
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explicit DISubrange(GlobalVariable *GV = 0);
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int64_t getLo() const { return (int64_t)getUInt64Field(1); }
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int64_t getHi() const { return (int64_t)getUInt64Field(2); }
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};
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/// DIArray - This descriptor holds an array of descriptors.
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class DIArray : public DIDescriptor {
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public:
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explicit DIArray(GlobalVariable *GV = 0) : DIDescriptor(GV) {}
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unsigned getNumElements() const;
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DIDescriptor getElement(unsigned Idx) const {
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return getDescriptorField(Idx);
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}
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};
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/// DICompileUnit - A wrapper for a compile unit.
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class DICompileUnit : public DIDescriptor {
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public:
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explicit DICompileUnit(GlobalVariable *GV = 0);
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unsigned getLanguage() const { return getUnsignedField(2); }
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std::string getFilename() const { return getStringField(3); }
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std::string getDirectory() const { return getStringField(4); }
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std::string getProducer() const { return getStringField(5); }
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/// isMain - Each input file is encoded as a separate compile unit in LLVM
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/// debugging information output. However, many target specific tool chains
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/// prefer to encode only one compile unit in an object file. In this
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/// situation, the LLVM code generator will include debugging information
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/// entities in the compile unit that is marked as main compile unit. The
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/// code generator accepts maximum one main compile unit per module. If a
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/// module does not contain any main compile unit then the code generator
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/// will emit multiple compile units in the output object file.
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bool isMain() const { return getUnsignedField(6); }
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bool isOptimized() const { return getUnsignedField(7); }
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std::string getFlags() const { return getStringField(8); }
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/// Verify - Verify that a compile unit is well formed.
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bool Verify() const;
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/// dump - print compile unit.
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void dump() const;
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};
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/// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
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/// FIXME: it seems strange that this doesn't have either a reference to the
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/// type/precision or a file/line pair for location info.
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class DIEnumerator : public DIDescriptor {
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public:
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explicit DIEnumerator(GlobalVariable *GV = 0);
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std::string getName() const { return getStringField(1); }
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uint64_t getEnumValue() const { return getUInt64Field(2); }
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};
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/// DIType - This is a wrapper for a type.
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/// FIXME: Types should be factored much better so that CV qualifiers and
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/// others do not require a huge and empty descriptor full of zeros.
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class DIType : public DIDescriptor {
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public:
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enum {
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FlagPrivate = 1 << 0,
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FlagProtected = 1 << 1,
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FlagFwdDecl = 1 << 2
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};
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protected:
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DIType(GlobalVariable *GV, unsigned Tag) : DIDescriptor(GV, Tag) {}
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// This ctor is used when the Tag has already been validated by a derived
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// ctor.
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DIType(GlobalVariable *GV, bool, bool) : DIDescriptor(GV) {}
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public:
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/// isDerivedType - Return true if the specified tag is legal for
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/// DIDerivedType.
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static bool isDerivedType(unsigned TAG);
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/// isCompositeType - Return true if the specified tag is legal for
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/// DICompositeType.
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static bool isCompositeType(unsigned TAG);
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/// isBasicType - Return true if the specified tag is legal for
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/// DIBasicType.
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static bool isBasicType(unsigned TAG) {
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return TAG == dwarf::DW_TAG_base_type;
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}
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/// Verify - Verify that a type descriptor is well formed.
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bool Verify() const;
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public:
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explicit DIType(GlobalVariable *GV);
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explicit DIType() {}
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virtual ~DIType() {}
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DIDescriptor getContext() const { return getDescriptorField(1); }
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std::string getName() const { return getStringField(2); }
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DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
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unsigned getLineNumber() const { return getUnsignedField(4); }
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uint64_t getSizeInBits() const { return getUInt64Field(5); }
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uint64_t getAlignInBits() const { return getUInt64Field(6); }
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// FIXME: Offset is only used for DW_TAG_member nodes. Making every type
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// carry this is just plain insane.
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uint64_t getOffsetInBits() const { return getUInt64Field(7); }
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unsigned getFlags() const { return getUnsignedField(8); }
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bool isPrivate() const { return (getFlags() & FlagPrivate) != 0; }
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bool isProtected() const { return (getFlags() & FlagProtected) != 0; }
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bool isForwardDecl() const { return (getFlags() & FlagFwdDecl) != 0; }
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/// dump - print type.
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void dump() const;
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};
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/// DIBasicType - A basic type, like 'int' or 'float'.
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class DIBasicType : public DIType {
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public:
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explicit DIBasicType(GlobalVariable *GV);
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unsigned getEncoding() const { return getUnsignedField(9); }
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/// dump - print basic type.
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void dump() const;
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};
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/// DIDerivedType - A simple derived type, like a const qualified type,
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/// a typedef, a pointer or reference, etc.
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class DIDerivedType : public DIType {
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protected:
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explicit DIDerivedType(GlobalVariable *GV, bool, bool)
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: DIType(GV, true, true) {}
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public:
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explicit DIDerivedType(GlobalVariable *GV);
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DIType getTypeDerivedFrom() const { return getFieldAs<DIType>(9); }
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/// dump - print derived type.
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void dump() const;
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};
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/// DICompositeType - This descriptor holds a type that can refer to multiple
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/// other types, like a function or struct.
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/// FIXME: Why is this a DIDerivedType??
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class DICompositeType : public DIDerivedType {
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public:
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explicit DICompositeType(GlobalVariable *GV);
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DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
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/// Verify - Verify that a composite type descriptor is well formed.
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bool Verify() const;
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/// dump - print composite type.
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void dump() const;
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};
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/// DIGlobal - This is a common class for global variables and subprograms.
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class DIGlobal : public DIDescriptor {
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protected:
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explicit DIGlobal(GlobalVariable *GV, unsigned RequiredTag)
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: DIDescriptor(GV, RequiredTag) {}
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/// isSubprogram - Return true if the specified tag is legal for
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/// DISubprogram.
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static bool isSubprogram(unsigned TAG) {
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return TAG == dwarf::DW_TAG_subprogram;
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}
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/// isGlobalVariable - Return true if the specified tag is legal for
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/// DIGlobalVariable.
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static bool isGlobalVariable(unsigned TAG) {
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return TAG == dwarf::DW_TAG_variable;
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}
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public:
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virtual ~DIGlobal() {}
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DIDescriptor getContext() const { return getDescriptorField(2); }
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std::string getName() const { return getStringField(3); }
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std::string getDisplayName() const { return getStringField(4); }
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std::string getLinkageName() const { return getStringField(5); }
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DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(6); }
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unsigned getLineNumber() const { return getUnsignedField(7); }
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DIType getType() const { return getFieldAs<DIType>(8); }
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/// isLocalToUnit - Return true if this subprogram is local to the current
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/// compile unit, like 'static' in C.
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unsigned isLocalToUnit() const { return getUnsignedField(9); }
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unsigned isDefinition() const { return getUnsignedField(10); }
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/// dump - print global.
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void dump() const;
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};
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/// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
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class DISubprogram : public DIGlobal {
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public:
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explicit DISubprogram(GlobalVariable *GV = 0);
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DICompositeType getType() const { return getFieldAs<DICompositeType>(8); }
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/// Verify - Verify that a subprogram descriptor is well formed.
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bool Verify() const;
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/// dump - print subprogram.
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void dump() const;
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};
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/// DIGlobalVariable - This is a wrapper for a global variable.
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class DIGlobalVariable : public DIGlobal {
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public:
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explicit DIGlobalVariable(GlobalVariable *GV = 0);
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GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
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/// Verify - Verify that a global variable descriptor is well formed.
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bool Verify() const;
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/// dump - print global variable.
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void dump() const;
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};
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/// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
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/// global etc).
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class DIVariable : public DIDescriptor {
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public:
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explicit DIVariable(GlobalVariable *GV = 0);
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DIDescriptor getContext() const { return getDescriptorField(1); }
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std::string getName() const { return getStringField(2); }
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DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
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unsigned getLineNumber() const { return getUnsignedField(4); }
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DIType getType() const { return getFieldAs<DIType>(5); }
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/// isVariable - Return true if the specified tag is legal for DIVariable.
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static bool isVariable(unsigned Tag);
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/// Verify - Verify that a variable descriptor is well formed.
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bool Verify() const;
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/// dump - print variable.
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void dump() const;
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};
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/// DIBlock - This is a wrapper for a block (e.g. a function, scope, etc).
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class DIBlock : public DIDescriptor {
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public:
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explicit DIBlock(GlobalVariable *GV = 0);
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DIDescriptor getContext() const { return getDescriptorField(1); }
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};
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/// DIFactory - This object assists with the construction of the various
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/// descriptors.
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class DIFactory {
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Module &M;
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// Cached values for uniquing and faster lookups.
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DIAnchor CompileUnitAnchor, SubProgramAnchor, GlobalVariableAnchor;
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const Type *EmptyStructPtr; // "{}*".
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Function *StopPointFn; // llvm.dbg.stoppoint
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Function *FuncStartFn; // llvm.dbg.func.start
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Function *RegionStartFn; // llvm.dbg.region.start
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Function *RegionEndFn; // llvm.dbg.region.end
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Function *DeclareFn; // llvm.dbg.declare
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StringMap<Constant*> StringCache;
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DenseMap<Constant*, DIDescriptor> SimpleConstantCache;
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DIFactory(const DIFactory &); // DO NOT IMPLEMENT
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void operator=(const DIFactory&); // DO NOT IMPLEMENT
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public:
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explicit DIFactory(Module &m);
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/// GetOrCreateCompileUnitAnchor - Return the anchor for compile units,
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/// creating a new one if there isn't already one in the module.
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DIAnchor GetOrCreateCompileUnitAnchor();
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/// GetOrCreateSubprogramAnchor - Return the anchor for subprograms,
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/// creating a new one if there isn't already one in the module.
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DIAnchor GetOrCreateSubprogramAnchor();
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/// GetOrCreateGlobalVariableAnchor - Return the anchor for globals,
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/// creating a new one if there isn't already one in the module.
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DIAnchor GetOrCreateGlobalVariableAnchor();
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/// GetOrCreateArray - Create an descriptor for an array of descriptors.
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/// This implicitly uniques the arrays created.
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DIArray GetOrCreateArray(DIDescriptor *Tys, unsigned NumTys);
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/// GetOrCreateSubrange - Create a descriptor for a value range. This
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/// implicitly uniques the values returned.
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DISubrange GetOrCreateSubrange(int64_t Lo, int64_t Hi);
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/// CreateCompileUnit - Create a new descriptor for the specified compile
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/// unit.
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DICompileUnit CreateCompileUnit(unsigned LangID,
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const std::string &Filename,
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const std::string &Directory,
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const std::string &Producer,
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bool isMain = false,
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bool isOptimized = false,
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const char *Flags = "");
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/// CreateEnumerator - Create a single enumerator value.
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DIEnumerator CreateEnumerator(const std::string &Name, uint64_t Val);
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/// CreateBasicType - Create a basic type like int, float, etc.
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DIBasicType CreateBasicType(DIDescriptor Context, const std::string &Name,
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DICompileUnit CompileUnit, unsigned LineNumber,
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uint64_t SizeInBits, uint64_t AlignInBits,
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uint64_t OffsetInBits, unsigned Flags,
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unsigned Encoding);
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/// CreateDerivedType - Create a derived type like const qualified type,
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/// pointer, typedef, etc.
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DIDerivedType CreateDerivedType(unsigned Tag, DIDescriptor Context,
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const std::string &Name,
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DICompileUnit CompileUnit,
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unsigned LineNumber,
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uint64_t SizeInBits, uint64_t AlignInBits,
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uint64_t OffsetInBits, unsigned Flags,
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DIType DerivedFrom);
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/// CreateCompositeType - Create a composite type like array, struct, etc.
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DICompositeType CreateCompositeType(unsigned Tag, DIDescriptor Context,
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const std::string &Name,
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DICompileUnit CompileUnit,
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unsigned LineNumber,
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uint64_t SizeInBits,
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uint64_t AlignInBits,
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uint64_t OffsetInBits, unsigned Flags,
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DIType DerivedFrom,
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DIArray Elements);
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/// CreateSubprogram - Create a new descriptor for the specified subprogram.
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/// See comments in DISubprogram for descriptions of these fields.
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DISubprogram CreateSubprogram(DIDescriptor Context, const std::string &Name,
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const std::string &DisplayName,
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const std::string &LinkageName,
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DICompileUnit CompileUnit, unsigned LineNo,
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DIType Type, bool isLocalToUnit,
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bool isDefinition);
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/// CreateGlobalVariable - Create a new descriptor for the specified global.
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DIGlobalVariable
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CreateGlobalVariable(DIDescriptor Context, const std::string &Name,
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const std::string &DisplayName,
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const std::string &LinkageName,
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DICompileUnit CompileUnit,
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unsigned LineNo, DIType Type, bool isLocalToUnit,
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bool isDefinition, llvm::GlobalVariable *GV);
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/// CreateVariable - Create a new descriptor for the specified variable.
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DIVariable CreateVariable(unsigned Tag, DIDescriptor Context,
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const std::string &Name,
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DICompileUnit CompileUnit, unsigned LineNo,
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DIType Type);
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/// CreateBlock - This creates a descriptor for a lexical block with the
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/// specified parent context.
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DIBlock CreateBlock(DIDescriptor Context);
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/// InsertStopPoint - Create a new llvm.dbg.stoppoint intrinsic invocation,
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/// inserting it at the end of the specified basic block.
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void InsertStopPoint(DICompileUnit CU, unsigned LineNo, unsigned ColNo,
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BasicBlock *BB);
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/// InsertSubprogramStart - Create a new llvm.dbg.func.start intrinsic to
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/// mark the start of the specified subprogram.
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void InsertSubprogramStart(DISubprogram SP, BasicBlock *BB);
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/// InsertRegionStart - Insert a new llvm.dbg.region.start intrinsic call to
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/// mark the start of a region for the specified scoping descriptor.
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void InsertRegionStart(DIDescriptor D, BasicBlock *BB);
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/// InsertRegionEnd - Insert a new llvm.dbg.region.end intrinsic call to
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/// mark the end of a region for the specified scoping descriptor.
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void InsertRegionEnd(DIDescriptor D, BasicBlock *BB);
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/// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
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void InsertDeclare(llvm::Value *Storage, DIVariable D, BasicBlock *BB);
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private:
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Constant *GetTagConstant(unsigned TAG);
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Constant *GetStringConstant(const std::string &String);
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DIAnchor GetOrCreateAnchor(unsigned TAG, const char *Name);
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/// getCastToEmpty - Return the descriptor as a Constant* with type '{}*'.
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Constant *getCastToEmpty(DIDescriptor D);
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};
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/// Finds the stoppoint coressponding to this instruction, that is the
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/// stoppoint that dominates this instruction
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const DbgStopPointInst *findStopPoint(const Instruction *Inst);
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/// Finds the stoppoint corresponding to first real (non-debug intrinsic)
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/// instruction in this Basic Block, and returns the stoppoint for it.
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const DbgStopPointInst *findBBStopPoint(const BasicBlock *BB);
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/// Finds the dbg.declare intrinsic corresponding to this value if any.
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/// It looks through pointer casts too.
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const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
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} // end namespace llvm
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#endif
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