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llvm-mirror/lib/DebugInfo/DWARFDebugRangeList.h
Alexey Samsonov 0dd3d6f49e Add support for fetching inlining context (stack of source code locations)
by instruction address from DWARF.

Add --inlining flag to llvm-dwarfdump to demonstrate and test this functionality,
so that "llvm-dwarfdump --inlining --address=0x..." now works much like
"addr2line -i 0x...", provided that the binary has debug info
(Clang's -gline-tables-only *is* enough).

llvm-svn: 163128
2012-09-04 08:12:33 +00:00

79 lines
2.9 KiB
C++

//===-- DWARFDebugRangeList.h -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
#define LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
#include "llvm/Support/DataExtractor.h"
#include <vector>
namespace llvm {
class raw_ostream;
class DWARFDebugRangeList {
public:
struct RangeListEntry {
// A beginning address offset. This address offset has the size of an
// address and is relative to the applicable base address of the
// compilation unit referencing this range list. It marks the beginning
// of an address range.
uint64_t StartAddress;
// An ending address offset. This address offset again has the size of
// an address and is relative to the applicable base address of the
// compilation unit referencing this range list. It marks the first
// address past the end of the address range. The ending address must
// be greater than or equal to the beginning address.
uint64_t EndAddress;
// The end of any given range list is marked by an end of list entry,
// which consists of a 0 for the beginning address offset
// and a 0 for the ending address offset.
bool isEndOfListEntry() const {
return (StartAddress == 0) && (EndAddress == 0);
}
// A base address selection entry consists of:
// 1. The value of the largest representable address offset
// (for example, 0xffffffff when the size of an address is 32 bits).
// 2. An address, which defines the appropriate base address for
// use in interpreting the beginning and ending address offsets of
// subsequent entries of the location list.
bool isBaseAddressSelectionEntry(uint8_t AddressSize) const {
assert(AddressSize == 4 || AddressSize == 8);
if (AddressSize == 4)
return StartAddress == -1U;
else
return StartAddress == -1ULL;
}
bool containsAddress(uint64_t BaseAddress, uint64_t Address) const {
return (BaseAddress + StartAddress <= Address) &&
(Address < BaseAddress + EndAddress);
}
};
private:
// Offset in .debug_ranges section.
uint32_t Offset;
uint8_t AddressSize;
std::vector<RangeListEntry> Entries;
public:
DWARFDebugRangeList() { clear(); }
void clear();
void dump(raw_ostream &OS) const;
bool extract(DataExtractor data, uint32_t *offset_ptr);
/// containsAddress - Returns true if range list contains the given
/// address. Has to be passed base address of the compile unit that
/// references this range list.
bool containsAddress(uint64_t BaseAddress, uint64_t Address) const;
};
} // namespace llvm
#endif // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H