DIE.cpp revision 6a7efcfc02ea5370fb0da66d750165a3ffe93ab7 
1//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Data structures for DWARF info entries.
11//
12//===----------------------------------------------------------------------===//
13
14#include "DIE.h"
15#include "llvm/ADT/Twine.h"
16#include "llvm/CodeGen/AsmPrinter.h"
17#include "llvm/MC/MCAsmInfo.h"
18#include "llvm/MC/MCStreamer.h"
19#include "llvm/MC/MCSymbol.h"
20#include "llvm/Target/TargetData.h"
21#include "llvm/Support/Allocator.h"
22#include "llvm/Support/Debug.h"
23#include "llvm/Support/ErrorHandling.h"
24#include "llvm/Support/Format.h"
25#include "llvm/Support/FormattedStream.h"
26using namespace llvm;
27
28//===----------------------------------------------------------------------===//
29// DIEAbbrevData Implementation
30//===----------------------------------------------------------------------===//
31
32/// Profile - Used to gather unique data for the abbreviation folding set.
33///
34void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
35  ID.AddInteger(Attribute);
36  ID.AddInteger(Form);
37}
38
39//===----------------------------------------------------------------------===//
40// DIEAbbrev Implementation
41//===----------------------------------------------------------------------===//
42
43/// Profile - Used to gather unique data for the abbreviation folding set.
44///
45void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
46  ID.AddInteger(Tag);
47  ID.AddInteger(ChildrenFlag);
48
49  // For each attribute description.
50  for (unsigned i = 0, N = Data.size(); i < N; ++i)
51    Data[i].Profile(ID);
52}
53
54/// Emit - Print the abbreviation using the specified asm printer.
55///
56void DIEAbbrev::Emit(AsmPrinter *AP) const {
57  // Emit its Dwarf tag type.
58  // FIXME: Doing work even in non-asm-verbose runs.
59  AP->EmitULEB128(Tag, dwarf::TagString(Tag));
60
61  // Emit whether it has children DIEs.
62  // FIXME: Doing work even in non-asm-verbose runs.
63  AP->EmitULEB128(ChildrenFlag, dwarf::ChildrenString(ChildrenFlag));
64
65  // For each attribute description.
66  for (unsigned i = 0, N = Data.size(); i < N; ++i) {
67    const DIEAbbrevData &AttrData = Data[i];
68
69    // Emit attribute type.
70    // FIXME: Doing work even in non-asm-verbose runs.
71    AP->EmitULEB128(AttrData.getAttribute(),
72                    dwarf::AttributeString(AttrData.getAttribute()));
73
74    // Emit form type.
75    // FIXME: Doing work even in non-asm-verbose runs.
76    AP->EmitULEB128(AttrData.getForm(),
77                    dwarf::FormEncodingString(AttrData.getForm()));
78  }
79
80  // Mark end of abbreviation.
81  AP->EmitULEB128(0, "EOM(1)");
82  AP->EmitULEB128(0, "EOM(2)");
83}
84
85#ifndef NDEBUG
86void DIEAbbrev::print(raw_ostream &O) {
87  O << "Abbreviation @"
88    << format("0x%lx", (long)(intptr_t)this)
89    << "  "
90    << dwarf::TagString(Tag)
91    << " "
92    << dwarf::ChildrenString(ChildrenFlag)
93    << '\n';
94
95  for (unsigned i = 0, N = Data.size(); i < N; ++i) {
96    O << "  "
97      << dwarf::AttributeString(Data[i].getAttribute())
98      << "  "
99      << dwarf::FormEncodingString(Data[i].getForm())
100      << '\n';
101  }
102}
103void DIEAbbrev::dump() { print(dbgs()); }
104#endif
105
106//===----------------------------------------------------------------------===//
107// DIE Implementation
108//===----------------------------------------------------------------------===//
109
110DIE::~DIE() {
111  for (unsigned i = 0, N = Children.size(); i < N; ++i)
112    delete Children[i];
113}
114
115/// addSiblingOffset - Add a sibling offset field to the front of the DIE.
116///
117DIEValue *DIE::addSiblingOffset(BumpPtrAllocator &A) {
118  DIEInteger *DI = new (A) DIEInteger(0);
119  Values.insert(Values.begin(), DI);
120  Abbrev.AddFirstAttribute(dwarf::DW_AT_sibling, dwarf::DW_FORM_ref4);
121  return DI;
122}
123
124#ifndef NDEBUG
125void DIE::print(raw_ostream &O, unsigned IncIndent) {
126  IndentCount += IncIndent;
127  const std::string Indent(IndentCount, ' ');
128  bool isBlock = Abbrev.getTag() == 0;
129
130  if (!isBlock) {
131    O << Indent
132      << "Die: "
133      << format("0x%lx", (long)(intptr_t)this)
134      << ", Offset: " << Offset
135      << ", Size: " << Size << "\n";
136
137    O << Indent
138      << dwarf::TagString(Abbrev.getTag())
139      << " "
140      << dwarf::ChildrenString(Abbrev.getChildrenFlag()) << "\n";
141  } else {
142    O << "Size: " << Size << "\n";
143  }
144
145  const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData();
146
147  IndentCount += 2;
148  for (unsigned i = 0, N = Data.size(); i < N; ++i) {
149    O << Indent;
150
151    if (!isBlock)
152      O << dwarf::AttributeString(Data[i].getAttribute());
153    else
154      O << "Blk[" << i << "]";
155
156    O <<  "  "
157      << dwarf::FormEncodingString(Data[i].getForm())
158      << " ";
159    Values[i]->print(O);
160    O << "\n";
161  }
162  IndentCount -= 2;
163
164  for (unsigned j = 0, M = Children.size(); j < M; ++j) {
165    Children[j]->print(O, 4);
166  }
167
168  if (!isBlock) O << "\n";
169  IndentCount -= IncIndent;
170}
171
172void DIE::dump() {
173  print(dbgs());
174}
175#endif
176
177
178#ifndef NDEBUG
179void DIEValue::dump() {
180  print(dbgs());
181}
182#endif
183
184//===----------------------------------------------------------------------===//
185// DIEInteger Implementation
186//===----------------------------------------------------------------------===//
187
188/// EmitValue - Emit integer of appropriate size.
189///
190void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const {
191  unsigned Size = ~0U;
192  switch (Form) {
193  case dwarf::DW_FORM_flag:  // Fall thru
194  case dwarf::DW_FORM_ref1:  // Fall thru
195  case dwarf::DW_FORM_data1: Size = 1; break;
196  case dwarf::DW_FORM_ref2:  // Fall thru
197  case dwarf::DW_FORM_data2: Size = 2; break;
198  case dwarf::DW_FORM_ref4:  // Fall thru
199  case dwarf::DW_FORM_data4: Size = 4; break;
200  case dwarf::DW_FORM_ref8:  // Fall thru
201  case dwarf::DW_FORM_data8: Size = 8; break;
202  case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
203  case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
204  case dwarf::DW_FORM_addr:  Size = Asm->getTargetData().getPointerSize(); break;
205  default: llvm_unreachable("DIE Value form not supported yet");
206  }
207  Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/);
208}
209
210/// SizeOf - Determine size of integer value in bytes.
211///
212unsigned DIEInteger::SizeOf(AsmPrinter *AP, unsigned Form) const {
213  switch (Form) {
214  case dwarf::DW_FORM_flag:  // Fall thru
215  case dwarf::DW_FORM_ref1:  // Fall thru
216  case dwarf::DW_FORM_data1: return sizeof(int8_t);
217  case dwarf::DW_FORM_ref2:  // Fall thru
218  case dwarf::DW_FORM_data2: return sizeof(int16_t);
219  case dwarf::DW_FORM_ref4:  // Fall thru
220  case dwarf::DW_FORM_data4: return sizeof(int32_t);
221  case dwarf::DW_FORM_ref8:  // Fall thru
222  case dwarf::DW_FORM_data8: return sizeof(int64_t);
223  case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer);
224  case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer);
225  case dwarf::DW_FORM_addr:  return AP->getTargetData().getPointerSize();
226  default: llvm_unreachable("DIE Value form not supported yet"); break;
227  }
228  return 0;
229}
230
231#ifndef NDEBUG
232void DIEInteger::print(raw_ostream &O) {
233  O << "Int: " << (int64_t)Integer
234    << format("  0x%llx", (unsigned long long)Integer);
235}
236#endif
237
238//===----------------------------------------------------------------------===//
239// DIELabel Implementation
240//===----------------------------------------------------------------------===//
241
242/// EmitValue - Emit label value.
243///
244void DIELabel::EmitValue(AsmPrinter *AP, unsigned Form) const {
245  AP->OutStreamer.EmitSymbolValue(Label, SizeOf(AP, Form), 0/*AddrSpace*/);
246}
247
248/// SizeOf - Determine size of label value in bytes.
249///
250unsigned DIELabel::SizeOf(AsmPrinter *AP, unsigned Form) const {
251  if (Form == dwarf::DW_FORM_data4) return 4;
252  if (Form == dwarf::DW_FORM_strp) return 4;
253  return AP->getTargetData().getPointerSize();
254}
255
256#ifndef NDEBUG
257void DIELabel::print(raw_ostream &O) {
258  O << "Lbl: " << Label->getName();
259}
260#endif
261
262//===----------------------------------------------------------------------===//
263// DIEDelta Implementation
264//===----------------------------------------------------------------------===//
265
266/// EmitValue - Emit delta value.
267///
268void DIEDelta::EmitValue(AsmPrinter *AP, unsigned Form) const {
269  AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
270}
271
272/// SizeOf - Determine size of delta value in bytes.
273///
274unsigned DIEDelta::SizeOf(AsmPrinter *AP, unsigned Form) const {
275  if (Form == dwarf::DW_FORM_data4) return 4;
276  if (Form == dwarf::DW_FORM_strp) return 4;
277  return AP->getTargetData().getPointerSize();
278}
279
280#ifndef NDEBUG
281void DIEDelta::print(raw_ostream &O) {
282  O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
283}
284#endif
285
286//===----------------------------------------------------------------------===//
287// DIEEntry Implementation
288//===----------------------------------------------------------------------===//
289
290/// EmitValue - Emit debug information entry offset.
291///
292void DIEEntry::EmitValue(AsmPrinter *AP, unsigned Form) const {
293  AP->EmitInt32(Entry->getOffset());
294}
295
296#ifndef NDEBUG
297void DIEEntry::print(raw_ostream &O) {
298  O << format("Die: 0x%lx", (long)(intptr_t)Entry);
299}
300#endif
301
302//===----------------------------------------------------------------------===//
303// DIEBlock Implementation
304//===----------------------------------------------------------------------===//
305
306/// ComputeSize - calculate the size of the block.
307///
308unsigned DIEBlock::ComputeSize(AsmPrinter *AP) {
309  if (!Size) {
310    const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
311    for (unsigned i = 0, N = Values.size(); i < N; ++i)
312      Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
313  }
314
315  return Size;
316}
317
318/// EmitValue - Emit block data.
319///
320void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const {
321  switch (Form) {
322  default: assert(0 && "Improper form for block");    break;
323  case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
324  case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
325  case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
326  case dwarf::DW_FORM_block:  Asm->EmitULEB128(Size); break;
327  }
328
329  const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
330  for (unsigned i = 0, N = Values.size(); i < N; ++i)
331    Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
332}
333
334/// SizeOf - Determine size of block data in bytes.
335///
336unsigned DIEBlock::SizeOf(AsmPrinter *AP, unsigned Form) const {
337  switch (Form) {
338  case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
339  case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
340  case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
341  case dwarf::DW_FORM_block:  return Size + MCAsmInfo::getULEB128Size(Size);
342  default: llvm_unreachable("Improper form for block"); break;
343  }
344  return 0;
345}
346
347#ifndef NDEBUG
348void DIEBlock::print(raw_ostream &O) {
349  O << "Blk: ";
350  DIE::print(O, 5);
351}
352#endif
353