mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-22 10:29:35 +00:00
b13d54f588
Implement debug_loc.dwo, as well as llvm-dwarfdump support for dumping this section. Outlined in the DWARF5 spec and http://gcc.gnu.org/wiki/DebugFission the debug_loc.dwo section has more variation than the standard debug_loc, allowing 3 different forms of entry (plus the end of list entry). GCC seems to, and Clang certainly, only use one form, so I've just implemented dumping support for that for now. It wasn't immediately obvious that there was a good refactoring to share the implementation of dumping support between debug_loc and debug_loc.dwo, so they're separate for now - ideas welcome or I may come back to it at some point. As per a comment in the code, we could choose different forms that may reduce the number of debug_addr entries we emit, but that will require further study. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204697 91177308-0d34-0410-b5e6-96231b3b80d8
129 lines
4.2 KiB
C++
129 lines
4.2 KiB
C++
//===-- DWARFDebugLoc.cpp -------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "DWARFDebugLoc.h"
|
|
#include "llvm/Support/Compiler.h"
|
|
#include "llvm/Support/Format.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
|
|
using namespace llvm;
|
|
|
|
void DWARFDebugLoc::dump(raw_ostream &OS) const {
|
|
for (const LocationList &L : Locations) {
|
|
OS << format("0x%8.8x: ", L.Offset);
|
|
const unsigned Indent = 12;
|
|
for (const Entry &E : L.Entries) {
|
|
if (&E != L.Entries.begin())
|
|
OS.indent(Indent);
|
|
OS << "Beginning address offset: " << format("0x%016" PRIx64, E.Begin)
|
|
<< '\n';
|
|
OS.indent(Indent) << " Ending address offset: "
|
|
<< format("0x%016" PRIx64, E.End) << '\n';
|
|
OS.indent(Indent) << " Location description: ";
|
|
for (unsigned char Loc : E.Loc) {
|
|
OS << format("%2.2x ", Loc);
|
|
}
|
|
OS << "\n\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
|
|
uint32_t Offset = 0;
|
|
while (data.isValidOffset(Offset+AddressSize-1)) {
|
|
Locations.resize(Locations.size() + 1);
|
|
LocationList &Loc = Locations.back();
|
|
Loc.Offset = Offset;
|
|
// 2.6.2 Location Lists
|
|
// A location list entry consists of:
|
|
while (true) {
|
|
Entry E;
|
|
RelocAddrMap::const_iterator AI = RelocMap.find(Offset);
|
|
// 1. A beginning address offset. ...
|
|
E.Begin = data.getUnsigned(&Offset, AddressSize);
|
|
if (AI != RelocMap.end())
|
|
E.Begin += AI->second.second;
|
|
|
|
AI = RelocMap.find(Offset);
|
|
// 2. An ending address offset. ...
|
|
E.End = data.getUnsigned(&Offset, AddressSize);
|
|
if (AI != RelocMap.end())
|
|
E.End += AI->second.second;
|
|
|
|
// The end of any given location 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.
|
|
if (E.Begin == 0 && E.End == 0)
|
|
break;
|
|
|
|
unsigned Bytes = data.getU16(&Offset);
|
|
// A single location description describing the location of the object...
|
|
StringRef str = data.getData().substr(Offset, Bytes);
|
|
Offset += Bytes;
|
|
E.Loc.reserve(str.size());
|
|
std::copy(str.begin(), str.end(), std::back_inserter(E.Loc));
|
|
Loc.Entries.push_back(std::move(E));
|
|
}
|
|
}
|
|
if (data.isValidOffset(Offset))
|
|
llvm::errs() << "error: failed to consume entire .debug_loc section\n";
|
|
}
|
|
|
|
void DWARFDebugLocDWO::parse(DataExtractor data) {
|
|
uint32_t Offset = 0;
|
|
while (data.isValidOffset(Offset)) {
|
|
Locations.resize(Locations.size() + 1);
|
|
LocationList &Loc = Locations.back();
|
|
Loc.Offset = Offset;
|
|
dwarf::LocationListEntry Kind;
|
|
while ((Kind = static_cast<dwarf::LocationListEntry>(
|
|
data.getU8(&Offset))) != dwarf::DW_LLE_end_of_list_entry) {
|
|
|
|
if (Kind != dwarf::DW_LLE_start_length_entry) {
|
|
llvm::errs() << "error: dumping support for LLE of kind " << (int)Kind
|
|
<< " not implemented\n";
|
|
return;
|
|
}
|
|
|
|
Entry E;
|
|
|
|
E.Start = data.getULEB128(&Offset);
|
|
E.Length = data.getU32(&Offset);
|
|
|
|
unsigned Bytes = data.getU16(&Offset);
|
|
// A single location description describing the location of the object...
|
|
StringRef str = data.getData().substr(Offset, Bytes);
|
|
Offset += Bytes;
|
|
E.Loc.resize(str.size());
|
|
std::copy(str.begin(), str.end(), E.Loc.begin());
|
|
|
|
Loc.Entries.push_back(std::move(E));
|
|
}
|
|
}
|
|
}
|
|
|
|
void DWARFDebugLocDWO::dump(raw_ostream &OS) const {
|
|
for (const LocationList &L : Locations) {
|
|
OS << format("0x%8.8x: ", L.Offset);
|
|
const unsigned Indent = 12;
|
|
for (const Entry &E : L.Entries) {
|
|
if (&E != L.Entries.begin())
|
|
OS.indent(Indent);
|
|
OS << "Beginning address index: " << E.Start << '\n';
|
|
OS.indent(Indent) << " Length: " << E.Length << '\n';
|
|
OS.indent(Indent) << " Location description: ";
|
|
for (unsigned char Loc : E.Loc)
|
|
OS << format("%2.2x ", Loc);
|
|
OS << "\n\n";
|
|
}
|
|
}
|
|
}
|
|
|