1 //===--- lib/CodeGen/DIE.h - DWARF Info Entries -----------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Data structures for DWARF info entries.
12 //===----------------------------------------------------------------------===//
14 #ifndef CODEGEN_ASMPRINTER_DIE_H__
15 #define CODEGEN_ASMPRINTER_DIE_H__
17 #include "llvm/ADT/FoldingSet.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/Support/Compiler.h"
20 #include "llvm/Support/Dwarf.h"
28 //===--------------------------------------------------------------------===//
29 /// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
30 /// Dwarf abbreviation.
32 /// Attribute - Dwarf attribute code.
36 /// Form - Dwarf form code.
40 DIEAbbrevData(unsigned A, unsigned F) : Attribute(A), Form(F) {}
43 unsigned getAttribute() const { return Attribute; }
44 unsigned getForm() const { return Form; }
46 /// Profile - Used to gather unique data for the abbreviation folding set.
48 void Profile(FoldingSetNodeID &ID) const;
51 //===--------------------------------------------------------------------===//
52 /// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
53 /// information object.
54 class DIEAbbrev : public FoldingSetNode {
55 /// Tag - Dwarf tag code.
59 /// Unique number for node.
63 /// ChildrenFlag - Dwarf children flag.
65 unsigned ChildrenFlag;
67 /// Data - Raw data bytes for abbreviation.
69 SmallVector<DIEAbbrevData, 8> Data;
72 DIEAbbrev(unsigned T, unsigned C) : Tag(T), ChildrenFlag(C), Data() {}
75 unsigned getTag() const { return Tag; }
76 unsigned getNumber() const { return Number; }
77 unsigned getChildrenFlag() const { return ChildrenFlag; }
78 const SmallVector<DIEAbbrevData, 8> &getData() const { return Data; }
79 void setTag(unsigned T) { Tag = T; }
80 void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
81 void setNumber(unsigned N) { Number = N; }
83 /// AddAttribute - Adds another set of attribute information to the
85 void AddAttribute(unsigned Attribute, unsigned Form) {
86 Data.push_back(DIEAbbrevData(Attribute, Form));
89 /// AddFirstAttribute - Adds a set of attribute information to the front
90 /// of the abbreviation.
91 void AddFirstAttribute(unsigned Attribute, unsigned Form) {
92 Data.insert(Data.begin(), DIEAbbrevData(Attribute, Form));
95 /// Profile - Used to gather unique data for the abbreviation folding set.
97 void Profile(FoldingSetNodeID &ID) const;
99 /// Emit - Print the abbreviation using the specified asm printer.
101 void Emit(AsmPrinter *AP) const;
104 void print(raw_ostream &O);
109 //===--------------------------------------------------------------------===//
110 /// DIE - A structured debug information entry. Has an abbreviation which
111 /// describes it's organization.
116 /// Abbrev - Buffer for constructing abbreviation.
120 /// Offset - Offset in debug info section.
124 /// Size - Size of instance + children.
130 std::vector<DIE *> Children;
134 /// Attributes values.
136 SmallVector<DIEValue*, 32> Values;
138 // Private data for print()
139 mutable unsigned IndentCount;
141 explicit DIE(unsigned Tag)
142 : Abbrev(Tag, dwarf::DW_CHILDREN_no), Offset(0),
143 Size(0), Parent(0), IndentCount(0) {}
147 DIEAbbrev &getAbbrev() { return Abbrev; }
148 unsigned getAbbrevNumber() const { return Abbrev.getNumber(); }
149 unsigned getTag() const { return Abbrev.getTag(); }
150 unsigned getOffset() const { return Offset; }
151 unsigned getSize() const { return Size; }
152 const std::vector<DIE *> &getChildren() const { return Children; }
153 const SmallVector<DIEValue*, 32> &getValues() const { return Values; }
154 DIE *getParent() const { return Parent; }
155 void setTag(unsigned Tag) { Abbrev.setTag(Tag); }
156 void setOffset(unsigned O) { Offset = O; }
157 void setSize(unsigned S) { Size = S; }
159 /// addValue - Add a value and attributes to a DIE.
161 void addValue(unsigned Attribute, unsigned Form, DIEValue *Value) {
162 Abbrev.AddAttribute(Attribute, Form);
163 Values.push_back(Value);
166 /// SiblingOffset - Return the offset of the debug information entry's
168 unsigned getSiblingOffset() const { return Offset + Size; }
170 /// addSiblingOffset - Add a sibling offset field to the front of the DIE.
171 /// The caller is responsible for deleting the return value at or after the
172 /// same time it destroys this DIE.
174 DIEValue *addSiblingOffset(BumpPtrAllocator &A);
176 /// addChild - Add a child to the DIE.
178 void addChild(DIE *Child) {
179 if (Child->getParent()) {
180 assert (Child->getParent() == this && "Unexpected DIE Parent!");
183 Abbrev.setChildrenFlag(dwarf::DW_CHILDREN_yes);
184 Children.push_back(Child);
185 Child->Parent = this;
189 void print(raw_ostream &O, unsigned IncIndent = 0);
194 //===--------------------------------------------------------------------===//
195 /// DIEValue - A debug information entry value.
208 /// Type - Type of data stored in the value.
212 explicit DIEValue(unsigned T) : Type(T) {}
213 virtual ~DIEValue() {}
216 unsigned getType() const { return Type; }
218 /// EmitValue - Emit value via the Dwarf writer.
220 virtual void EmitValue(AsmPrinter *AP, unsigned Form) const = 0;
222 /// SizeOf - Return the size of a value in bytes.
224 virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const = 0;
226 // Implement isa/cast/dyncast.
227 static bool classof(const DIEValue *) { return true; }
230 virtual void print(raw_ostream &O) = 0;
235 //===--------------------------------------------------------------------===//
236 /// DIEInteger - An integer value DIE.
238 class DIEInteger : public DIEValue {
241 explicit DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
243 /// BestForm - Choose the best form for integer.
245 static unsigned BestForm(bool IsSigned, uint64_t Int) {
247 if ((char)Int == (signed)Int) return dwarf::DW_FORM_data1;
248 if ((short)Int == (signed)Int) return dwarf::DW_FORM_data2;
249 if ((int)Int == (signed)Int) return dwarf::DW_FORM_data4;
251 if ((unsigned char)Int == Int) return dwarf::DW_FORM_data1;
252 if ((unsigned short)Int == Int) return dwarf::DW_FORM_data2;
253 if ((unsigned int)Int == Int) return dwarf::DW_FORM_data4;
255 return dwarf::DW_FORM_data8;
258 /// EmitValue - Emit integer of appropriate size.
260 virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
262 uint64_t getValue() const { return Integer; }
264 /// SizeOf - Determine size of integer value in bytes.
266 virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const;
268 // Implement isa/cast/dyncast.
269 static bool classof(const DIEInteger *) { return true; }
270 static bool classof(const DIEValue *I) { return I->getType() == isInteger; }
273 virtual void print(raw_ostream &O);
277 //===--------------------------------------------------------------------===//
278 /// DIELabel - A label expression DIE.
280 class DIELabel : public DIEValue {
281 const MCSymbol *Label;
283 explicit DIELabel(const MCSymbol *L) : DIEValue(isLabel), Label(L) {}
285 /// EmitValue - Emit label value.
287 virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
289 /// getValue - Get MCSymbol.
291 const MCSymbol *getValue() const { return Label; }
293 /// SizeOf - Determine size of label value in bytes.
295 virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const;
297 // Implement isa/cast/dyncast.
298 static bool classof(const DIELabel *) { return true; }
299 static bool classof(const DIEValue *L) { return L->getType() == isLabel; }
302 virtual void print(raw_ostream &O);
306 //===--------------------------------------------------------------------===//
307 /// DIEDelta - A simple label difference DIE.
309 class DIEDelta : public DIEValue {
310 const MCSymbol *LabelHi;
311 const MCSymbol *LabelLo;
313 DIEDelta(const MCSymbol *Hi, const MCSymbol *Lo)
314 : DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
316 /// EmitValue - Emit delta value.
318 virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
320 /// SizeOf - Determine size of delta value in bytes.
322 virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const;
324 // Implement isa/cast/dyncast.
325 static bool classof(const DIEDelta *) { return true; }
326 static bool classof(const DIEValue *D) { return D->getType() == isDelta; }
329 virtual void print(raw_ostream &O);
333 //===--------------------------------------------------------------------===//
334 /// DIEEntry - A pointer to another debug information entry. An instance of
335 /// this class can also be used as a proxy for a debug information entry not
336 /// yet defined (ie. types.)
337 class DIEEntry : public DIEValue {
340 explicit DIEEntry(DIE *E) : DIEValue(isEntry), Entry(E) {}
342 DIE *getEntry() const { return Entry; }
344 /// EmitValue - Emit debug information entry offset.
346 virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
348 /// SizeOf - Determine size of debug information entry in bytes.
350 virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const {
351 return sizeof(int32_t);
354 // Implement isa/cast/dyncast.
355 static bool classof(const DIEEntry *) { return true; }
356 static bool classof(const DIEValue *E) { return E->getType() == isEntry; }
359 virtual void print(raw_ostream &O);
363 //===--------------------------------------------------------------------===//
364 /// DIEBlock - A block of values. Primarily used for location expressions.
366 class DIEBlock : public DIEValue, public DIE {
367 unsigned Size; // Size in bytes excluding size header.
370 : DIEValue(isBlock), DIE(0), Size(0) {}
371 virtual ~DIEBlock() {}
373 /// ComputeSize - calculate the size of the block.
375 unsigned ComputeSize(AsmPrinter *AP);
377 /// BestForm - Choose the best form for data.
379 unsigned BestForm() const {
380 if ((unsigned char)Size == Size) return dwarf::DW_FORM_block1;
381 if ((unsigned short)Size == Size) return dwarf::DW_FORM_block2;
382 if ((unsigned int)Size == Size) return dwarf::DW_FORM_block4;
383 return dwarf::DW_FORM_block;
386 /// EmitValue - Emit block data.
388 virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
390 /// SizeOf - Determine size of block data in bytes.
392 virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const;
394 // Implement isa/cast/dyncast.
395 static bool classof(const DIEBlock *) { return true; }
396 static bool classof(const DIEValue *E) { return E->getType() == isBlock; }
399 virtual void print(raw_ostream &O);
403 } // end llvm namespace