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ea5a42fe9c
Add a helper method to get address ranges specified in a DIE (either by DW_AT_low_pc/DW_AT_high_pc, or by DW_AT_ranges). Use it to untangle and simplify the code. No functionality change. llvm-svn: 206624
78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
//===-- DWARFDebugRangeList.h -----------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
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#define LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
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#include "llvm/Support/DataExtractor.h"
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#include <vector>
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namespace llvm {
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class raw_ostream;
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/// DWARFAddressRangesVector - represents a set of absolute address ranges.
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typedef std::vector<std::pair<uint64_t, uint64_t>> DWARFAddressRangesVector;
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class DWARFDebugRangeList {
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public:
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struct RangeListEntry {
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// A beginning address offset. This address offset has the size of an
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// address and is relative to the applicable base address of the
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// compilation unit referencing this range list. It marks the beginning
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// of an address range.
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uint64_t StartAddress;
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// An ending address offset. This address offset again has the size of
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// an address and is relative to the applicable base address of the
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// compilation unit referencing this range list. It marks the first
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// address past the end of the address range. The ending address must
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// be greater than or equal to the beginning address.
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uint64_t EndAddress;
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// The end of any given range list is marked by an end of list entry,
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// which consists of a 0 for the beginning address offset
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// and a 0 for the ending address offset.
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bool isEndOfListEntry() const {
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return (StartAddress == 0) && (EndAddress == 0);
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}
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// A base address selection entry consists of:
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// 1. The value of the largest representable address offset
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// (for example, 0xffffffff when the size of an address is 32 bits).
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// 2. An address, which defines the appropriate base address for
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// use in interpreting the beginning and ending address offsets of
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// subsequent entries of the location list.
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bool isBaseAddressSelectionEntry(uint8_t AddressSize) const {
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assert(AddressSize == 4 || AddressSize == 8);
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if (AddressSize == 4)
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return StartAddress == -1U;
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else
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return StartAddress == -1ULL;
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}
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};
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private:
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// Offset in .debug_ranges section.
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uint32_t Offset;
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uint8_t AddressSize;
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std::vector<RangeListEntry> Entries;
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public:
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DWARFDebugRangeList() { clear(); }
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void clear();
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void dump(raw_ostream &OS) const;
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bool extract(DataExtractor data, uint32_t *offset_ptr);
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/// getAbsoluteRanges - Returns absolute address ranges defined by this range
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/// list. Has to be passed base address of the compile unit referencing this
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/// range list.
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DWARFAddressRangesVector getAbsoluteRanges(uint64_t BaseAddress) const;
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};
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} // namespace llvm
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#endif // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
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