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"
26 using namespace llvm;
27 
28 //===----------------------------------------------------------------------===//
29 // DIEAbbrevData Implementation
30 //===----------------------------------------------------------------------===//
31 
32 /// Profile - Used to gather unique data for the abbreviation folding set.
33 ///
34 void 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 ///
45 void 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 ///
56 void 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
86 void 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 }
103 void DIEAbbrev::dump() { print(dbgs()); }
104 #endif
105 
106 //===----------------------------------------------------------------------===//
107 // DIE Implementation
108 //===----------------------------------------------------------------------===//
109 
110 DIE::~DIE() {
111   for (unsigned i = 0, N = Children.size(); i < N; ++i)
112     delete Children[i];
113 }
114 
115 #ifndef NDEBUG
116 void DIE::print(raw_ostream &O, unsigned IncIndent) {
117   IndentCount += IncIndent;
118   const std::string Indent(IndentCount, ' ');
119   bool isBlock = Abbrev.getTag() == 0;
120 
121   if (!isBlock) {
122     O << Indent
123       << "Die: "
124       << format("0x%lx", (long)(intptr_t)this)
125       << ", Offset: " << Offset
126       << ", Size: " << Size << "\n";
127 
128     O << Indent
129       << dwarf::TagString(Abbrev.getTag())
130       << " "
131       << dwarf::ChildrenString(Abbrev.getChildrenFlag()) << "\n";
132   } else {
133     O << "Size: " << Size << "\n";
134   }
135 
136   const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData();
137 
138   IndentCount += 2;
139   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
140     O << Indent;
141 
142     if (!isBlock)
143       O << dwarf::AttributeString(Data[i].getAttribute());
144     else
145       O << "Blk[" << i << "]";
146 
147     O <<  "  "
148       << dwarf::FormEncodingString(Data[i].getForm())
149       << " ";
150     Values[i]->print(O);
151     O << "\n";
152   }
153   IndentCount -= 2;
154 
155   for (unsigned j = 0, M = Children.size(); j < M; ++j) {
156     Children[j]->print(O, 4);
157   }
158 
159   if (!isBlock) O << "\n";
160   IndentCount -= IncIndent;
161 }
162 
163 void DIE::dump() {
164   print(dbgs());
165 }
166 #endif
167 
168 void DIEValue::anchor() { }
169 
170 #ifndef NDEBUG
171 void DIEValue::dump() {
172   print(dbgs());
173 }
174 #endif
175 
176 //===----------------------------------------------------------------------===//
177 // DIEInteger Implementation
178 //===----------------------------------------------------------------------===//
179 
180 /// EmitValue - Emit integer of appropriate size.
181 ///
182 void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const {
183   unsigned Size = ~0U;
184   switch (Form) {
185   case dwarf::DW_FORM_flag_present:
186     // Emit something to keep the lines and comments in sync.
187     // FIXME: Is there a better way to do this?
188     if (Asm->OutStreamer.hasRawTextSupport())
189       Asm->OutStreamer.EmitRawText(StringRef(""));
190     return;
191   case dwarf::DW_FORM_flag:  // Fall thru
192   case dwarf::DW_FORM_ref1:  // Fall thru
193   case dwarf::DW_FORM_data1: Size = 1; break;
194   case dwarf::DW_FORM_ref2:  // Fall thru
195   case dwarf::DW_FORM_data2: Size = 2; break;
196   case dwarf::DW_FORM_ref4:  // Fall thru
197   case dwarf::DW_FORM_data4: Size = 4; break;
198   case dwarf::DW_FORM_ref8:  // Fall thru
199   case dwarf::DW_FORM_data8: Size = 8; break;
200   case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
201   case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
202   case dwarf::DW_FORM_addr:  Size = Asm->getTargetData().getPointerSize(); break;
203   default: llvm_unreachable("DIE Value form not supported yet");
204   }
205   Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/);
206 }
207 
208 /// SizeOf - Determine size of integer value in bytes.
209 ///
210 unsigned DIEInteger::SizeOf(AsmPrinter *AP, unsigned Form) const {
211   switch (Form) {
212   case dwarf::DW_FORM_flag_present: return 0;
213   case dwarf::DW_FORM_flag:  // Fall thru
214   case dwarf::DW_FORM_ref1:  // Fall thru
215   case dwarf::DW_FORM_data1: return sizeof(int8_t);
216   case dwarf::DW_FORM_ref2:  // Fall thru
217   case dwarf::DW_FORM_data2: return sizeof(int16_t);
218   case dwarf::DW_FORM_ref4:  // Fall thru
219   case dwarf::DW_FORM_data4: return sizeof(int32_t);
220   case dwarf::DW_FORM_ref8:  // Fall thru
221   case dwarf::DW_FORM_data8: return sizeof(int64_t);
222   case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer);
223   case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer);
224   case dwarf::DW_FORM_addr:  return AP->getTargetData().getPointerSize();
225   default: llvm_unreachable("DIE Value form not supported yet");
226   }
227 }
228 
229 #ifndef NDEBUG
230 void DIEInteger::print(raw_ostream &O) {
231   O << "Int: " << (int64_t)Integer << "  0x";
232   O.write_hex(Integer);
233 }
234 #endif
235 
236 //===----------------------------------------------------------------------===//
237 // DIELabel Implementation
238 //===----------------------------------------------------------------------===//
239 
240 /// EmitValue - Emit label value.
241 ///
242 void DIELabel::EmitValue(AsmPrinter *AP, unsigned Form) const {
243   AP->OutStreamer.EmitSymbolValue(Label, SizeOf(AP, Form), 0/*AddrSpace*/);
244 }
245 
246 /// SizeOf - Determine size of label value in bytes.
247 ///
248 unsigned DIELabel::SizeOf(AsmPrinter *AP, unsigned Form) const {
249   if (Form == dwarf::DW_FORM_data4) return 4;
250   if (Form == dwarf::DW_FORM_strp) return 4;
251   return AP->getTargetData().getPointerSize();
252 }
253 
254 #ifndef NDEBUG
255 void DIELabel::print(raw_ostream &O) {
256   O << "Lbl: " << Label->getName();
257 }
258 #endif
259 
260 //===----------------------------------------------------------------------===//
261 // DIEDelta Implementation
262 //===----------------------------------------------------------------------===//
263 
264 /// EmitValue - Emit delta value.
265 ///
266 void DIEDelta::EmitValue(AsmPrinter *AP, unsigned Form) const {
267   AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
268 }
269 
270 /// SizeOf - Determine size of delta value in bytes.
271 ///
272 unsigned DIEDelta::SizeOf(AsmPrinter *AP, unsigned Form) const {
273   if (Form == dwarf::DW_FORM_data4) return 4;
274   if (Form == dwarf::DW_FORM_strp) return 4;
275   return AP->getTargetData().getPointerSize();
276 }
277 
278 #ifndef NDEBUG
279 void DIEDelta::print(raw_ostream &O) {
280   O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
281 }
282 #endif
283 
284 //===----------------------------------------------------------------------===//
285 // DIEEntry Implementation
286 //===----------------------------------------------------------------------===//
287 
288 /// EmitValue - Emit debug information entry offset.
289 ///
290 void DIEEntry::EmitValue(AsmPrinter *AP, unsigned Form) const {
291   AP->EmitInt32(Entry->getOffset());
292 }
293 
294 #ifndef NDEBUG
295 void DIEEntry::print(raw_ostream &O) {
296   O << format("Die: 0x%lx", (long)(intptr_t)Entry);
297 }
298 #endif
299 
300 //===----------------------------------------------------------------------===//
301 // DIEBlock Implementation
302 //===----------------------------------------------------------------------===//
303 
304 /// ComputeSize - calculate the size of the block.
305 ///
306 unsigned DIEBlock::ComputeSize(AsmPrinter *AP) {
307   if (!Size) {
308     const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
309     for (unsigned i = 0, N = Values.size(); i < N; ++i)
310       Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
311   }
312 
313   return Size;
314 }
315 
316 /// EmitValue - Emit block data.
317 ///
318 void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const {
319   switch (Form) {
320   default: llvm_unreachable("Improper form for block");
321   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
322   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
323   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
324   case dwarf::DW_FORM_block:  Asm->EmitULEB128(Size); break;
325   }
326 
327   const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
328   for (unsigned i = 0, N = Values.size(); i < N; ++i)
329     Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
330 }
331 
332 /// SizeOf - Determine size of block data in bytes.
333 ///
334 unsigned DIEBlock::SizeOf(AsmPrinter *AP, unsigned Form) const {
335   switch (Form) {
336   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
337   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
338   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
339   case dwarf::DW_FORM_block:  return Size + MCAsmInfo::getULEB128Size(Size);
340   default: llvm_unreachable("Improper form for block");
341   }
342 }
343 
344 #ifndef NDEBUG
345 void DIEBlock::print(raw_ostream &O) {
346   O << "Blk: ";
347   DIE::print(O, 5);
348 }
349 #endif
350