LLVM  8.0.0svn
DWARFDebugRangeList.cpp
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1 //===- DWARFDebugRangesList.cpp -------------------------------------------===//
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 
12 #include "llvm/Support/Errc.h"
13 #include "llvm/Support/Format.h"
15 #include <cinttypes>
16 #include <cstdint>
17 
18 using namespace llvm;
19 
21  Offset = -1U;
22  AddressSize = 0;
23  Entries.clear();
24 }
25 
27  uint32_t *offset_ptr) {
28  clear();
29  if (!data.isValidOffset(*offset_ptr))
31  "invalid range list offset 0x%" PRIx32, *offset_ptr);
32 
33  AddressSize = data.getAddressSize();
34  if (AddressSize != 4 && AddressSize != 8)
36  "invalid address size: %" PRIu8, AddressSize);
37  Offset = *offset_ptr;
38  while (true) {
39  RangeListEntry Entry;
40  Entry.SectionIndex = -1ULL;
41 
42  uint32_t prev_offset = *offset_ptr;
43  Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
44  Entry.EndAddress =
45  data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);
46 
47  // Check that both values were extracted correctly.
48  if (*offset_ptr != prev_offset + 2 * AddressSize) {
49  clear();
51  "invalid range list entry at offset 0x%" PRIx32,
52  prev_offset);
53  }
54  if (Entry.isEndOfListEntry())
55  break;
56  Entries.push_back(Entry);
57  }
58  return Error::success();
59 }
60 
62  for (const RangeListEntry &RLE : Entries) {
63  const char *format_str = (AddressSize == 4
64  ? "%08x %08" PRIx64 " %08" PRIx64 "\n"
65  : "%08x %016" PRIx64 " %016" PRIx64 "\n");
66  OS << format(format_str, Offset, RLE.StartAddress, RLE.EndAddress);
67  }
68  OS << format("%08x <End of list>\n", Offset);
69 }
70 
72  llvm::Optional<SectionedAddress> BaseAddr) const {
74  for (const RangeListEntry &RLE : Entries) {
75  if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
76  BaseAddr = {RLE.EndAddress, RLE.SectionIndex};
77  continue;
78  }
79 
81  E.LowPC = RLE.StartAddress;
82  E.HighPC = RLE.EndAddress;
83  E.SectionIndex = RLE.SectionIndex;
84  // Base address of a range list entry is determined by the closest preceding
85  // base address selection entry in the same range list. It defaults to the
86  // base address of the compilation unit if there is no such entry.
87  if (BaseAddr) {
88  E.LowPC += BaseAddr->Address;
89  E.HighPC += BaseAddr->Address;
90  if (E.SectionIndex == -1ULL)
91  E.SectionIndex = BaseAddr->SectionIndex;
92  }
93  Res.push_back(E);
94  }
95  return Res;
96 }
This class represents lattice values for constants.
Definition: AllocatorList.h:24
uint64_t SectionIndex
A section index this range belongs to.
void dump(raw_ostream &OS) const
format_object< Ts... > format(const char *Fmt, const Ts &... Vals)
These are helper functions used to produce formatted output.
Definition: Format.h:124
uint64_t getRelocatedAddress(uint32_t *Off, uint64_t *SecIx=nullptr) const
Extracts an address-sized value and applies a relocation to the result if one exists for the given of...
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
uint8_t getAddressSize() const
Get the address size for this extractor.
Definition: DataExtractor.h:59
DWARFAddressRangesVector getAbsoluteRanges(llvm::Optional< SectionedAddress > BaseAddr) const
getAbsoluteRanges - Returns absolute address ranges defined by this range list.
A DataExtractor (typically for an in-memory copy of an object-file section) plus a relocation map for...
static ErrorSuccess success()
Create a success value.
Definition: Error.h:327
uint64_t EndAddress
An ending address offset.
bool isEndOfListEntry() const
The end of any given range list is marked by an end of list entry, which consists of a 0 for the begi...
bool isValidOffset(uint32_t offset) const
Test the validity of offset.
std::vector< DWARFAddressRange > DWARFAddressRangesVector
DWARFAddressRangesVector - represents a set of absolute address ranges.
Lightweight error class with error context and mandatory checking.
Definition: Error.h:158
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
uint64_t StartAddress
A beginning address offset.
Error createStringError(std::error_code EC, char const *Fmt, const Ts &... Vals)
Create formatted StringError object.
Definition: Error.h:1162
Error extract(const DWARFDataExtractor &data, uint32_t *offset_ptr)