diff options
Diffstat (limited to 'source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp')
| -rw-r--r-- | source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp | 178 |
1 files changed, 174 insertions, 4 deletions
diff --git a/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp b/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp index 89e27efb3cc28..a0436dd7ffad4 100644 --- a/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp +++ b/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp @@ -8,6 +8,7 @@ //===----------------------------------------------------------------------===// #include "DWARFDebugRanges.h" +#include "DWARFUnit.h" #include "SymbolFileDWARF.h" #include "lldb/Utility/Stream.h" #include <assert.h> @@ -29,8 +30,6 @@ static dw_addr_t GetBaseAddressMarker(uint32_t addr_size) { DWARFDebugRanges::DWARFDebugRanges() : m_range_map() {} -DWARFDebugRanges::~DWARFDebugRanges() {} - void DWARFDebugRanges::Extract(SymbolFileDWARF *dwarf2Data) { DWARFRangeList range_list; lldb::offset_t offset = 0; @@ -112,14 +111,185 @@ void DWARFDebugRanges::Dump(Stream &s, } } -bool DWARFDebugRanges::FindRanges(dw_addr_t debug_ranges_base, +bool DWARFDebugRanges::FindRanges(const DWARFUnit *cu, dw_offset_t debug_ranges_offset, DWARFRangeList &range_list) const { - dw_addr_t debug_ranges_address = debug_ranges_base + debug_ranges_offset; + dw_addr_t debug_ranges_address = cu->GetRangesBase() + debug_ranges_offset; range_map_const_iterator pos = m_range_map.find(debug_ranges_address); if (pos != m_range_map.end()) { range_list = pos->second; + + // All DW_AT_ranges are relative to the base address of the compile + // unit. We add the compile unit base address to make sure all the + // addresses are properly fixed up. + range_list.Slide(cu->GetBaseAddress()); + return true; + } + return false; +} + +uint64_t DWARFDebugRanges::GetOffset(size_t Index) const { + lldbassert(false && "DW_FORM_rnglistx is not present before DWARF5"); + return 0; +} + +bool DWARFDebugRngLists::ExtractRangeList( + const DWARFDataExtractor &data, uint8_t addrSize, + lldb::offset_t *offset_ptr, std::vector<RngListEntry> &rangeList) { + rangeList.clear(); + + bool error = false; + while (!error) { + switch (data.GetU8(offset_ptr)) { + case DW_RLE_end_of_list: + return true; + + case DW_RLE_start_length: { + dw_addr_t begin = data.GetMaxU64(offset_ptr, addrSize); + dw_addr_t len = data.GetULEB128(offset_ptr); + rangeList.push_back({DW_RLE_start_length, begin, len}); + break; + } + + case DW_RLE_start_end: { + dw_addr_t begin = data.GetMaxU64(offset_ptr, addrSize); + dw_addr_t end = data.GetMaxU64(offset_ptr, addrSize); + rangeList.push_back({DW_RLE_start_end, begin, end}); + break; + } + + case DW_RLE_base_address: { + dw_addr_t base = data.GetMaxU64(offset_ptr, addrSize); + rangeList.push_back({DW_RLE_base_address, base, 0}); + break; + } + + case DW_RLE_offset_pair: { + dw_addr_t begin = data.GetULEB128(offset_ptr); + dw_addr_t end = data.GetULEB128(offset_ptr); + rangeList.push_back({DW_RLE_offset_pair, begin, end}); + break; + } + + case DW_RLE_base_addressx: { + dw_addr_t base = data.GetULEB128(offset_ptr); + rangeList.push_back({DW_RLE_base_addressx, base, 0}); + break; + } + + case DW_RLE_startx_endx: { + dw_addr_t start = data.GetULEB128(offset_ptr); + dw_addr_t end = data.GetULEB128(offset_ptr); + rangeList.push_back({DW_RLE_startx_endx, start, end}); + break; + } + + case DW_RLE_startx_length: { + dw_addr_t start = data.GetULEB128(offset_ptr); + dw_addr_t length = data.GetULEB128(offset_ptr); + rangeList.push_back({DW_RLE_startx_length, start, length}); + break; + } + + default: + lldbassert(0 && "unknown range list entry encoding"); + error = true; + } + } + + return false; +} + +static uint64_t ReadAddressFromDebugAddrSection(const DWARFUnit *cu, + uint32_t index) { + uint32_t index_size = cu->GetAddressByteSize(); + dw_offset_t addr_base = cu->GetAddrBase(); + lldb::offset_t offset = addr_base + index * index_size; + return cu->GetSymbolFileDWARF()->get_debug_addr_data().GetMaxU64(&offset, + index_size); +} + +bool DWARFDebugRngLists::FindRanges(const DWARFUnit *cu, + dw_offset_t debug_ranges_offset, + DWARFRangeList &range_list) const { + range_list.Clear(); + dw_addr_t debug_ranges_address = cu->GetRangesBase() + debug_ranges_offset; + auto pos = m_range_map.find(debug_ranges_address); + if (pos != m_range_map.end()) { + dw_addr_t BaseAddr = cu->GetBaseAddress(); + for (const RngListEntry &E : pos->second) { + switch (E.encoding) { + case DW_RLE_start_length: + range_list.Append(DWARFRangeList::Entry(E.value0, E.value1)); + break; + case DW_RLE_base_address: + BaseAddr = E.value0; + break; + case DW_RLE_start_end: + range_list.Append(DWARFRangeList::Entry(E.value0, E.value1 - E.value0)); + break; + case DW_RLE_offset_pair: + range_list.Append( + DWARFRangeList::Entry(BaseAddr + E.value0, E.value1 - E.value0)); + break; + case DW_RLE_base_addressx: { + BaseAddr = ReadAddressFromDebugAddrSection(cu, E.value0); + break; + } + case DW_RLE_startx_endx: { + dw_addr_t start = ReadAddressFromDebugAddrSection(cu, E.value0); + dw_addr_t end = ReadAddressFromDebugAddrSection(cu, E.value1); + range_list.Append(DWARFRangeList::Entry(start, end - start)); + break; + } + case DW_RLE_startx_length: { + dw_addr_t start = ReadAddressFromDebugAddrSection(cu, E.value0); + range_list.Append(DWARFRangeList::Entry(start, E.value1)); + break; + } + default: + llvm_unreachable("unexpected encoding"); + } + } return true; } return false; } + +void DWARFDebugRngLists::Extract(SymbolFileDWARF *dwarf2Data) { + const DWARFDataExtractor &data = dwarf2Data->get_debug_rnglists_data(); + lldb::offset_t offset = 0; + + uint64_t length = data.GetU32(&offset); + bool isDwarf64 = (length == 0xffffffff); + if (isDwarf64) + length = data.GetU64(&offset); + lldb::offset_t end = offset + length; + + // Check version. + if (data.GetU16(&offset) < 5) + return; + + uint8_t addrSize = data.GetU8(&offset); + + // We do not support non-zero segment selector size. + if (data.GetU8(&offset) != 0) { + lldbassert(0 && "not implemented"); + return; + } + + uint32_t offsetsAmount = data.GetU32(&offset); + for (uint32_t i = 0; i < offsetsAmount; ++i) + Offsets.push_back(data.GetMaxU64(&offset, isDwarf64 ? 8 : 4)); + + lldb::offset_t listOffset = offset; + std::vector<RngListEntry> rangeList; + while (offset < end && ExtractRangeList(data, addrSize, &offset, rangeList)) { + m_range_map[listOffset] = rangeList; + listOffset = offset; + } +} + +uint64_t DWARFDebugRngLists::GetOffset(size_t Index) const { + return Offsets[Index]; +} |