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//===-- DWARFDebugAranges.cpp -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugAranges.h"
#include "DWARFCompileUnit.h"
#include "DWARFContext.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
using namespace llvm;
namespace {
class CountArangeDescriptors {
public:
CountArangeDescriptors(uint32_t &count_ref) : Count(count_ref) {}
void operator()(const DWARFDebugArangeSet &Set) {
Count += Set.getNumDescriptors();
}
uint32_t &Count;
};
class AddArangeDescriptors {
public:
AddArangeDescriptors(DWARFDebugAranges::RangeColl &Ranges,
DWARFDebugAranges::ParsedCUOffsetColl &CUOffsets)
: RangeCollection(Ranges),
CUOffsetCollection(CUOffsets) {}
void operator()(const DWARFDebugArangeSet &Set) {
DWARFDebugAranges::Range Range;
Range.CUOffset = Set.getCompileUnitDIEOffset();
CUOffsetCollection.insert(Range.CUOffset);
for (uint32_t i = 0, n = Set.getNumDescriptors(); i < n; ++i) {
const DWARFDebugArangeSet::Descriptor *ArangeDescPtr =
Set.getDescriptor(i);
Range.LowPC = ArangeDescPtr->Address;
Range.Length = ArangeDescPtr->Length;
// Insert each item in increasing address order so binary searching
// can later be done!
DWARFDebugAranges::RangeColl::iterator InsertPos =
std::lower_bound(RangeCollection.begin(), RangeCollection.end(),
Range);
RangeCollection.insert(InsertPos, Range);
}
}
DWARFDebugAranges::RangeColl &RangeCollection;
DWARFDebugAranges::ParsedCUOffsetColl &CUOffsetCollection;
};
}
void DWARFDebugAranges::extract(DataExtractor DebugArangesData) {
if (!DebugArangesData.isValidOffset(0))
return;
uint32_t offset = 0;
typedef std::vector<DWARFDebugArangeSet> SetCollection;
SetCollection sets;
DWARFDebugArangeSet set;
Range range;
while (set.extract(DebugArangesData, &offset))
sets.push_back(set);
uint32_t count = 0;
std::for_each(sets.begin(), sets.end(), CountArangeDescriptors(count));
if (count > 0) {
Aranges.reserve(count);
AddArangeDescriptors range_adder(Aranges, ParsedCUOffsets);
std::for_each(sets.begin(), sets.end(), range_adder);
}
}
void DWARFDebugAranges::generate(DWARFContext *CTX) {
if (CTX) {
const uint32_t num_compile_units = CTX->getNumCompileUnits();
for (uint32_t cu_idx = 0; cu_idx < num_compile_units; ++cu_idx) {
if (DWARFCompileUnit *cu = CTX->getCompileUnitAtIndex(cu_idx)) {
uint32_t CUOffset = cu->getOffset();
if (ParsedCUOffsets.insert(CUOffset).second)
cu->buildAddressRangeTable(this, true, CUOffset);
}
}
}
sortAndMinimize();
}
void DWARFDebugAranges::dump(raw_ostream &OS) const {
for (RangeCollIterator I = Aranges.begin(), E = Aranges.end(); I != E; ++I) {
I->dump(OS);
}
}
void DWARFDebugAranges::Range::dump(raw_ostream &OS) const {
OS << format("{0x%8.8x}: [0x%8.8" PRIx64 " - 0x%8.8" PRIx64 ")\n",
CUOffset, LowPC, HighPC());
}
void DWARFDebugAranges::appendRange(uint32_t CUOffset, uint64_t LowPC,
uint64_t HighPC) {
if (!Aranges.empty()) {
if (Aranges.back().CUOffset == CUOffset &&
Aranges.back().HighPC() == LowPC) {
Aranges.back().setHighPC(HighPC);
return;
}
}
Aranges.push_back(Range(LowPC, HighPC, CUOffset));
}
void DWARFDebugAranges::sortAndMinimize() {
const size_t orig_arange_size = Aranges.size();
// Size of one? If so, no sorting is needed
if (orig_arange_size <= 1)
return;
// Sort our address range entries
std::stable_sort(Aranges.begin(), Aranges.end());
// Most address ranges are contiguous from function to function
// so our new ranges will likely be smaller. We calculate the size
// of the new ranges since although std::vector objects can be resized,
// the will never reduce their allocated block size and free any excesss
// memory, so we might as well start a brand new collection so it is as
// small as possible.
// First calculate the size of the new minimal arange vector
// so we don't have to do a bunch of re-allocations as we
// copy the new minimal stuff over to the new collection.
size_t minimal_size = 1;
for (size_t i = 1; i < orig_arange_size; ++i) {
if (!Range::SortedOverlapCheck(Aranges[i-1], Aranges[i]))
++minimal_size;
}
// If the sizes are the same, then no consecutive aranges can be
// combined, we are done.
if (minimal_size == orig_arange_size)
return;
// Else, make a new RangeColl that _only_ contains what we need.
RangeColl minimal_aranges;
minimal_aranges.resize(minimal_size);
uint32_t j = 0;
minimal_aranges[j] = Aranges[0];
for (size_t i = 1; i < orig_arange_size; ++i) {
if (Range::SortedOverlapCheck(minimal_aranges[j], Aranges[i])) {
minimal_aranges[j].setHighPC(Aranges[i].HighPC());
} else {
// Only increment j if we aren't merging
minimal_aranges[++j] = Aranges[i];
}
}
assert(j+1 == minimal_size);
// Now swap our new minimal aranges into place. The local
// minimal_aranges will then contian the old big collection
// which will get freed.
minimal_aranges.swap(Aranges);
}
uint32_t DWARFDebugAranges::findAddress(uint64_t Address) const {
if (!Aranges.empty()) {
Range range(Address);
RangeCollIterator begin = Aranges.begin();
RangeCollIterator end = Aranges.end();
RangeCollIterator pos =
std::lower_bound(begin, end, range);
if (pos != end && pos->containsAddress(Address)) {
return pos->CUOffset;
} else if (pos != begin) {
--pos;
if (pos->containsAddress(Address))
return pos->CUOffset;
}
}
return -1U;
}
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