1 //===-- DWARFFormValue.cpp ------------------------------------------------===//
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 #include "DWARFFormValue.h"
11 #include "DWARFCompileUnit.h"
12 #include "DWARFContext.h"
13 #include "llvm/Support/Dwarf.h"
14 #include "llvm/Support/Format.h"
15 #include "llvm/Support/raw_ostream.h"
18 using namespace dwarf;
20 static const uint8_t form_sizes_addr4[] = {
22 4, // 0x01 DW_FORM_addr
24 0, // 0x03 DW_FORM_block2
25 0, // 0x04 DW_FORM_block4
26 2, // 0x05 DW_FORM_data2
27 4, // 0x06 DW_FORM_data4
28 8, // 0x07 DW_FORM_data8
29 0, // 0x08 DW_FORM_string
30 0, // 0x09 DW_FORM_block
31 0, // 0x0a DW_FORM_block1
32 1, // 0x0b DW_FORM_data1
33 1, // 0x0c DW_FORM_flag
34 0, // 0x0d DW_FORM_sdata
35 4, // 0x0e DW_FORM_strp
36 0, // 0x0f DW_FORM_udata
37 4, // 0x10 DW_FORM_ref_addr
38 1, // 0x11 DW_FORM_ref1
39 2, // 0x12 DW_FORM_ref2
40 4, // 0x13 DW_FORM_ref4
41 8, // 0x14 DW_FORM_ref8
42 0, // 0x15 DW_FORM_ref_udata
43 0, // 0x16 DW_FORM_indirect
44 4, // 0x17 DW_FORM_sec_offset
45 0, // 0x18 DW_FORM_exprloc
46 0, // 0x19 DW_FORM_flag_present
47 8, // 0x20 DW_FORM_ref_sig8
50 static const uint8_t form_sizes_addr8[] = {
52 8, // 0x01 DW_FORM_addr
54 0, // 0x03 DW_FORM_block2
55 0, // 0x04 DW_FORM_block4
56 2, // 0x05 DW_FORM_data2
57 4, // 0x06 DW_FORM_data4
58 8, // 0x07 DW_FORM_data8
59 0, // 0x08 DW_FORM_string
60 0, // 0x09 DW_FORM_block
61 0, // 0x0a DW_FORM_block1
62 1, // 0x0b DW_FORM_data1
63 1, // 0x0c DW_FORM_flag
64 0, // 0x0d DW_FORM_sdata
65 4, // 0x0e DW_FORM_strp
66 0, // 0x0f DW_FORM_udata
67 8, // 0x10 DW_FORM_ref_addr
68 1, // 0x11 DW_FORM_ref1
69 2, // 0x12 DW_FORM_ref2
70 4, // 0x13 DW_FORM_ref4
71 8, // 0x14 DW_FORM_ref8
72 0, // 0x15 DW_FORM_ref_udata
73 0, // 0x16 DW_FORM_indirect
74 8, // 0x17 DW_FORM_sec_offset
75 0, // 0x18 DW_FORM_exprloc
76 0, // 0x19 DW_FORM_flag_present
77 8, // 0x20 DW_FORM_ref_sig8
81 DWARFFormValue::getFixedFormSizesForAddressSize(uint8_t addr_size) {
83 case 4: return form_sizes_addr4;
84 case 8: return form_sizes_addr8;
90 DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
91 const DWARFCompileUnit *cu) {
92 bool indirect = false;
93 bool is_block = false;
95 // Read the value for the form into value and follow and DW_FORM_indirect
96 // instances we run into
101 case DW_FORM_ref_addr:
102 Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize());
104 case DW_FORM_exprloc:
106 Value.uval = data.getULEB128(offset_ptr);
110 Value.uval = data.getU8(offset_ptr);
114 Value.uval = data.getU16(offset_ptr);
118 Value.uval = data.getU32(offset_ptr);
124 Value.uval = data.getU8(offset_ptr);
128 Value.uval = data.getU16(offset_ptr);
132 Value.uval = data.getU32(offset_ptr);
136 Value.uval = data.getU64(offset_ptr);
139 Value.sval = data.getSLEB128(offset_ptr);
142 Value.uval = data.getU32(offset_ptr);
145 case DW_FORM_ref_udata:
146 Value.uval = data.getULEB128(offset_ptr);
149 Value.cstr = data.getCStr(offset_ptr);
150 // Set the string value to also be the data for inlined cstr form
151 // values only so we can tell the differnence between DW_FORM_string
152 // and DW_FORM_strp form values
153 Value.data = (const uint8_t*)Value.cstr;
155 case DW_FORM_indirect:
156 Form = data.getULEB128(offset_ptr);
159 case DW_FORM_sec_offset:
160 if (cu->getAddressByteSize() == 4)
161 Value.uval = data.getU32(offset_ptr);
163 Value.uval = data.getU64(offset_ptr);
165 case DW_FORM_flag_present:
168 case DW_FORM_ref_sig8:
169 Value.uval = data.getU64(offset_ptr);
177 StringRef str = data.getData().substr(*offset_ptr, Value.uval);
180 Value.data = reinterpret_cast<const uint8_t *>(str.data());
181 *offset_ptr += Value.uval;
189 DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr,
190 const DWARFCompileUnit *cu) const {
191 return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, cu);
195 DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
196 uint32_t *offset_ptr, const DWARFCompileUnit *cu) {
197 bool indirect = false;
201 // Blocks if inlined data that have a length field and the data bytes
202 // inlined in the .debug_info
203 case DW_FORM_exprloc:
204 case DW_FORM_block: {
205 uint64_t size = debug_info_data.getULEB128(offset_ptr);
209 case DW_FORM_block1: {
210 uint8_t size = debug_info_data.getU8(offset_ptr);
214 case DW_FORM_block2: {
215 uint16_t size = debug_info_data.getU16(offset_ptr);
219 case DW_FORM_block4: {
220 uint32_t size = debug_info_data.getU32(offset_ptr);
225 // Inlined NULL terminated C-strings
227 debug_info_data.getCStr(offset_ptr);
230 // Compile unit address sized values
232 case DW_FORM_ref_addr:
233 *offset_ptr += cu->getAddressByteSize();
236 // 0 byte values - implied from the form.
237 case DW_FORM_flag_present:
263 case DW_FORM_ref_sig8:
267 // signed or unsigned LEB 128 values
268 // case DW_FORM_APPLE_db_str:
271 case DW_FORM_ref_udata:
272 debug_info_data.getULEB128(offset_ptr);
275 case DW_FORM_indirect:
277 form = debug_info_data.getULEB128(offset_ptr);
280 // 4 for DWARF32, 8 for DWARF64.
281 case DW_FORM_sec_offset:
282 if (cu->getAddressByteSize() == 4)
296 DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const {
297 DataExtractor debug_str_data(cu->getContext().getStringSection(), true, 0);
298 uint64_t uvalue = getUnsigned();
299 bool cu_relative_offset = false;
302 case DW_FORM_addr: OS << format("0x%016" PRIx64, uvalue); break;
303 case DW_FORM_flag_present: OS << "true"; break;
305 case DW_FORM_data1: OS << format("0x%02x", (uint8_t)uvalue); break;
306 case DW_FORM_data2: OS << format("0x%04x", (uint16_t)uvalue); break;
307 case DW_FORM_data4: OS << format("0x%08x", (uint32_t)uvalue); break;
308 case DW_FORM_ref_sig8:
309 case DW_FORM_data8: OS << format("0x%016" PRIx64, uvalue); break;
312 OS.write_escaped(getAsCString(NULL));
315 case DW_FORM_exprloc:
322 case DW_FORM_exprloc:
323 case DW_FORM_block: OS << format("<0x%" PRIx64 "> ", uvalue); break;
324 case DW_FORM_block1: OS << format("<0x%2.2x> ", (uint8_t)uvalue); break;
325 case DW_FORM_block2: OS << format("<0x%4.4x> ", (uint16_t)uvalue); break;
326 case DW_FORM_block4: OS << format("<0x%8.8x> ", (uint32_t)uvalue); break;
330 const uint8_t* data_ptr = Value.data;
332 // uvalue contains size of block
333 const uint8_t* end_data_ptr = data_ptr + uvalue;
334 while (data_ptr < end_data_ptr) {
335 OS << format("%2.2x ", *data_ptr);
344 case DW_FORM_sdata: OS << getSigned(); break;
345 case DW_FORM_udata: OS << getUnsigned(); break;
347 OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue);
348 const char* dbg_str = getAsCString(&debug_str_data);
351 OS.write_escaped(dbg_str);
356 case DW_FORM_ref_addr:
357 OS << format("0x%016" PRIx64, uvalue);
360 cu_relative_offset = true;
361 OS << format("cu + 0x%2.2x", (uint8_t)uvalue);
364 cu_relative_offset = true;
365 OS << format("cu + 0x%4.4x", (uint16_t)uvalue);
368 cu_relative_offset = true;
369 OS << format("cu + 0x%4.4x", (uint32_t)uvalue);
372 cu_relative_offset = true;
373 OS << format("cu + 0x%8.8" PRIx64, uvalue);
375 case DW_FORM_ref_udata:
376 cu_relative_offset = true;
377 OS << format("cu + 0x%" PRIx64, uvalue);
380 // All DW_FORM_indirect attributes should be resolved prior to calling
382 case DW_FORM_indirect:
383 OS << "DW_FORM_indirect";
386 case DW_FORM_sec_offset:
387 if (cu->getAddressByteSize() == 4)
388 OS << format("0x%08x", (uint32_t)uvalue);
390 OS << format("0x%016" PRIx64, uvalue);
394 OS << format("DW_FORM(0x%4.4x)", Form);
398 if (cu_relative_offset)
399 OS << format(" => {0x%8.8" PRIx64 "}", uvalue + (cu ? cu->getOffset() : 0));
403 DWARFFormValue::getAsCString(const DataExtractor *debug_str_data_ptr) const {
404 if (isInlinedCStr()) {
406 } else if (debug_str_data_ptr) {
407 uint32_t offset = Value.uval;
408 return debug_str_data_ptr->getCStr(&offset);
413 uint64_t DWARFFormValue::getReference(const DWARFCompileUnit *cu) const {
414 uint64_t die_offset = Value.uval;
420 case DW_FORM_ref_udata:
421 die_offset += (cu ? cu->getOffset() : 0);
431 DWARFFormValue::resolveCompileUnitReferences(const DWARFCompileUnit *cu) {
437 case DW_FORM_ref_udata:
438 Value.uval += cu->getOffset();
439 Form = DW_FORM_ref_addr;
447 const uint8_t *DWARFFormValue::BlockData() const {
448 if (!isInlinedCStr())
453 bool DWARFFormValue::isBlockForm(uint16_t form) {
455 case DW_FORM_exprloc:
465 bool DWARFFormValue::isDataForm(uint16_t form) {