DIE.cpp revision 263508 
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 "DwarfDebug.h"
16#include "llvm/ADT/Twine.h"
17#include "llvm/CodeGen/AsmPrinter.h"
18#include "llvm/IR/DataLayout.h"
19#include "llvm/MC/MCAsmInfo.h"
20#include "llvm/MC/MCStreamer.h"
21#include "llvm/MC/MCSymbol.h"
22#include "llvm/Support/Allocator.h"
23#include "llvm/Support/Debug.h"
24#include "llvm/Support/ErrorHandling.h"
25#include "llvm/Support/Format.h"
26#include "llvm/Support/FormattedStream.h"
27#include "llvm/Support/MD5.h"
28using namespace llvm;
29
30//===----------------------------------------------------------------------===//
31// DIEAbbrevData Implementation
32//===----------------------------------------------------------------------===//
33
34/// Profile - Used to gather unique data for the abbreviation folding set.
35///
36void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
37  // Explicitly cast to an integer type for which FoldingSetNodeID has
38  // overloads.  Otherwise MSVC 2010 thinks this call is ambiguous.
39  ID.AddInteger(unsigned(Attribute));
40  ID.AddInteger(unsigned(Form));
41}
42
43//===----------------------------------------------------------------------===//
44// DIEAbbrev Implementation
45//===----------------------------------------------------------------------===//
46
47/// Profile - Used to gather unique data for the abbreviation folding set.
48///
49void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
50  ID.AddInteger(unsigned(Tag));
51  ID.AddInteger(ChildrenFlag);
52
53  // For each attribute description.
54  for (unsigned i = 0, N = Data.size(); i < N; ++i)
55    Data[i].Profile(ID);
56}
57
58/// Emit - Print the abbreviation using the specified asm printer.
59///
60void DIEAbbrev::Emit(AsmPrinter *AP) const {
61  // Emit its Dwarf tag type.
62  AP->EmitULEB128(Tag, dwarf::TagString(Tag));
63
64  // Emit whether it has children DIEs.
65  AP->EmitULEB128(ChildrenFlag, dwarf::ChildrenString(ChildrenFlag));
66
67  // For each attribute description.
68  for (unsigned i = 0, N = Data.size(); i < N; ++i) {
69    const DIEAbbrevData &AttrData = Data[i];
70
71    // Emit attribute type.
72    AP->EmitULEB128(AttrData.getAttribute(),
73                    dwarf::AttributeString(AttrData.getAttribute()));
74
75    // Emit form type.
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/// Climb up the parent chain to get the compile unit DIE to which this DIE
116/// belongs.
117const DIE *DIE::getCompileUnit() const {
118  const DIE *Cu = getCompileUnitOrNull();
119  assert(Cu && "We should not have orphaned DIEs.");
120  return Cu;
121}
122
123/// Climb up the parent chain to get the compile unit DIE this DIE belongs
124/// to. Return NULL if DIE is not added to an owner yet.
125const DIE *DIE::getCompileUnitOrNull() const {
126  const DIE *p = this;
127  while (p) {
128    if (p->getTag() == dwarf::DW_TAG_compile_unit)
129      return p;
130    p = p->getParent();
131  }
132  return NULL;
133}
134
135DIEValue *DIE::findAttribute(uint16_t Attribute) {
136  const SmallVectorImpl<DIEValue *> &Values = getValues();
137  const DIEAbbrev &Abbrevs = getAbbrev();
138
139  // Iterate through all the attributes until we find the one we're
140  // looking for, if we can't find it return NULL.
141  for (size_t i = 0; i < Values.size(); ++i)
142    if (Abbrevs.getData()[i].getAttribute() == Attribute)
143      return Values[i];
144  return NULL;
145}
146
147#ifndef NDEBUG
148void DIE::print(raw_ostream &O, unsigned IndentCount) const {
149  const std::string Indent(IndentCount, ' ');
150  bool isBlock = Abbrev.getTag() == 0;
151
152  if (!isBlock) {
153    O << Indent
154      << "Die: "
155      << format("0x%lx", (long)(intptr_t)this)
156      << ", Offset: " << Offset
157      << ", Size: " << Size << "\n";
158
159    O << Indent
160      << dwarf::TagString(Abbrev.getTag())
161      << " "
162      << dwarf::ChildrenString(Abbrev.getChildrenFlag()) << "\n";
163  } else {
164    O << "Size: " << Size << "\n";
165  }
166
167  const SmallVectorImpl<DIEAbbrevData> &Data = Abbrev.getData();
168
169  IndentCount += 2;
170  for (unsigned i = 0, N = Data.size(); i < N; ++i) {
171    O << Indent;
172
173    if (!isBlock)
174      O << dwarf::AttributeString(Data[i].getAttribute());
175    else
176      O << "Blk[" << i << "]";
177
178    O <<  "  "
179      << dwarf::FormEncodingString(Data[i].getForm())
180      << " ";
181    Values[i]->print(O);
182    O << "\n";
183  }
184  IndentCount -= 2;
185
186  for (unsigned j = 0, M = Children.size(); j < M; ++j) {
187    Children[j]->print(O, IndentCount+4);
188  }
189
190  if (!isBlock) O << "\n";
191}
192
193void DIE::dump() {
194  print(dbgs());
195}
196#endif
197
198void DIEValue::anchor() { }
199
200#ifndef NDEBUG
201void DIEValue::dump() const {
202  print(dbgs());
203}
204#endif
205
206//===----------------------------------------------------------------------===//
207// DIEInteger Implementation
208//===----------------------------------------------------------------------===//
209
210/// EmitValue - Emit integer of appropriate size.
211///
212void DIEInteger::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
213  unsigned Size = ~0U;
214  switch (Form) {
215  case dwarf::DW_FORM_flag_present:
216    // Emit something to keep the lines and comments in sync.
217    // FIXME: Is there a better way to do this?
218    if (Asm->OutStreamer.hasRawTextSupport())
219      Asm->OutStreamer.EmitRawText("");
220    return;
221  case dwarf::DW_FORM_flag:  // Fall thru
222  case dwarf::DW_FORM_ref1:  // Fall thru
223  case dwarf::DW_FORM_data1: Size = 1; break;
224  case dwarf::DW_FORM_ref2:  // Fall thru
225  case dwarf::DW_FORM_data2: Size = 2; break;
226  case dwarf::DW_FORM_sec_offset: // Fall thru
227  case dwarf::DW_FORM_ref4:  // Fall thru
228  case dwarf::DW_FORM_data4: Size = 4; break;
229  case dwarf::DW_FORM_ref8:  // Fall thru
230  case dwarf::DW_FORM_data8: Size = 8; break;
231  case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
232  case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
233  case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
234  case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
235  case dwarf::DW_FORM_addr:
236    Size = Asm->getDataLayout().getPointerSize(); break;
237  default: llvm_unreachable("DIE Value form not supported yet");
238  }
239  Asm->OutStreamer.EmitIntValue(Integer, Size);
240}
241
242/// SizeOf - Determine size of integer value in bytes.
243///
244unsigned DIEInteger::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
245  switch (Form) {
246  case dwarf::DW_FORM_flag_present: return 0;
247  case dwarf::DW_FORM_flag:  // Fall thru
248  case dwarf::DW_FORM_ref1:  // Fall thru
249  case dwarf::DW_FORM_data1: return sizeof(int8_t);
250  case dwarf::DW_FORM_ref2:  // Fall thru
251  case dwarf::DW_FORM_data2: return sizeof(int16_t);
252  case dwarf::DW_FORM_sec_offset: // Fall thru
253  case dwarf::DW_FORM_ref4:  // Fall thru
254  case dwarf::DW_FORM_data4: return sizeof(int32_t);
255  case dwarf::DW_FORM_ref8:  // Fall thru
256  case dwarf::DW_FORM_data8: return sizeof(int64_t);
257  case dwarf::DW_FORM_GNU_str_index: return MCAsmInfo::getULEB128Size(Integer);
258  case dwarf::DW_FORM_GNU_addr_index: return MCAsmInfo::getULEB128Size(Integer);
259  case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer);
260  case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer);
261  case dwarf::DW_FORM_addr:  return AP->getDataLayout().getPointerSize();
262  default: llvm_unreachable("DIE Value form not supported yet");
263  }
264}
265
266#ifndef NDEBUG
267void DIEInteger::print(raw_ostream &O) const {
268  O << "Int: " << (int64_t)Integer << "  0x";
269  O.write_hex(Integer);
270}
271#endif
272
273//===----------------------------------------------------------------------===//
274// DIEExpr Implementation
275//===----------------------------------------------------------------------===//
276
277/// EmitValue - Emit expression value.
278///
279void DIEExpr::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
280  AP->OutStreamer.EmitValue(Expr, SizeOf(AP, Form));
281}
282
283/// SizeOf - Determine size of expression value in bytes.
284///
285unsigned DIEExpr::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
286  if (Form == dwarf::DW_FORM_data4) return 4;
287  if (Form == dwarf::DW_FORM_sec_offset) return 4;
288  if (Form == dwarf::DW_FORM_strp) return 4;
289  return AP->getDataLayout().getPointerSize();
290}
291
292#ifndef NDEBUG
293void DIEExpr::print(raw_ostream &O) const {
294  O << "Expr: ";
295  Expr->print(O);
296}
297#endif
298
299//===----------------------------------------------------------------------===//
300// DIELabel Implementation
301//===----------------------------------------------------------------------===//
302
303/// EmitValue - Emit label value.
304///
305void DIELabel::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
306  AP->EmitLabelReference(Label, SizeOf(AP, Form),
307                         Form == dwarf::DW_FORM_strp ||
308                             Form == dwarf::DW_FORM_sec_offset ||
309                             Form == dwarf::DW_FORM_ref_addr);
310}
311
312/// SizeOf - Determine size of label value in bytes.
313///
314unsigned DIELabel::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
315  if (Form == dwarf::DW_FORM_data4) return 4;
316  if (Form == dwarf::DW_FORM_sec_offset) return 4;
317  if (Form == dwarf::DW_FORM_strp) return 4;
318  return AP->getDataLayout().getPointerSize();
319}
320
321#ifndef NDEBUG
322void DIELabel::print(raw_ostream &O) const {
323  O << "Lbl: " << Label->getName();
324}
325#endif
326
327//===----------------------------------------------------------------------===//
328// DIEDelta Implementation
329//===----------------------------------------------------------------------===//
330
331/// EmitValue - Emit delta value.
332///
333void DIEDelta::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
334  AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
335}
336
337/// SizeOf - Determine size of delta value in bytes.
338///
339unsigned DIEDelta::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
340  if (Form == dwarf::DW_FORM_data4) return 4;
341  if (Form == dwarf::DW_FORM_sec_offset) return 4;
342  if (Form == dwarf::DW_FORM_strp) return 4;
343  return AP->getDataLayout().getPointerSize();
344}
345
346#ifndef NDEBUG
347void DIEDelta::print(raw_ostream &O) const {
348  O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
349}
350#endif
351
352//===----------------------------------------------------------------------===//
353// DIEString Implementation
354//===----------------------------------------------------------------------===//
355
356/// EmitValue - Emit string value.
357///
358void DIEString::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
359  Access->EmitValue(AP, Form);
360}
361
362/// SizeOf - Determine size of delta value in bytes.
363///
364unsigned DIEString::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
365  return Access->SizeOf(AP, Form);
366}
367
368#ifndef NDEBUG
369void DIEString::print(raw_ostream &O) const {
370  O << "String: " << Str << "\tSymbol: ";
371  Access->print(O);
372}
373#endif
374
375//===----------------------------------------------------------------------===//
376// DIEEntry Implementation
377//===----------------------------------------------------------------------===//
378
379/// EmitValue - Emit debug information entry offset.
380///
381void DIEEntry::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
382  AP->EmitInt32(Entry->getOffset());
383}
384
385unsigned DIEEntry::getRefAddrSize(AsmPrinter *AP) {
386  // DWARF4: References that use the attribute form DW_FORM_ref_addr are
387  // specified to be four bytes in the DWARF 32-bit format and eight bytes
388  // in the DWARF 64-bit format, while DWARF Version 2 specifies that such
389  // references have the same size as an address on the target system.
390  if (AP->getDwarfDebug()->getDwarfVersion() == 2)
391    return AP->getDataLayout().getPointerSize();
392  return sizeof(int32_t);
393}
394
395#ifndef NDEBUG
396void DIEEntry::print(raw_ostream &O) const {
397  O << format("Die: 0x%lx", (long)(intptr_t)Entry);
398}
399#endif
400
401//===----------------------------------------------------------------------===//
402// DIEBlock Implementation
403//===----------------------------------------------------------------------===//
404
405/// ComputeSize - calculate the size of the block.
406///
407unsigned DIEBlock::ComputeSize(AsmPrinter *AP) {
408  if (!Size) {
409    const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
410    for (unsigned i = 0, N = Values.size(); i < N; ++i)
411      Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
412  }
413
414  return Size;
415}
416
417/// EmitValue - Emit block data.
418///
419void DIEBlock::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
420  switch (Form) {
421  default: llvm_unreachable("Improper form for block");
422  case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
423  case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
424  case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
425  case dwarf::DW_FORM_block:  Asm->EmitULEB128(Size); break;
426  }
427
428  const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
429  for (unsigned i = 0, N = Values.size(); i < N; ++i)
430    Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
431}
432
433/// SizeOf - Determine size of block data in bytes.
434///
435unsigned DIEBlock::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
436  switch (Form) {
437  case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
438  case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
439  case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
440  case dwarf::DW_FORM_block:  return Size + MCAsmInfo::getULEB128Size(Size);
441  default: llvm_unreachable("Improper form for block");
442  }
443}
444
445#ifndef NDEBUG
446void DIEBlock::print(raw_ostream &O) const {
447  O << "Blk: ";
448  DIE::print(O, 5);
449}
450#endif
451