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dc9a4f7391
There is no need to keep the whole contents of .debug_aranges section in memory when we build address ranges table. Memory optimization that used to be in this code (precalculate the size of vector of ranges before filling it) is not really needed - later we will compact and resize this vector anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207457 91177308-0d34-0410-b5e6-96231b3b80d8
142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
//===-- DWARFDebugAranges.cpp -----------------------------------*- 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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#include "DWARFDebugAranges.h"
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#include "DWARFCompileUnit.h"
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#include "DWARFContext.h"
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#include "DWARFDebugArangeSet.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cassert>
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using namespace llvm;
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void DWARFDebugAranges::extract(DataExtractor DebugArangesData) {
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if (!DebugArangesData.isValidOffset(0))
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return;
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uint32_t Offset = 0;
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DWARFDebugArangeSet Set;
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while (Set.extract(DebugArangesData, &Offset)) {
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uint32_t CUOffset = Set.getCompileUnitDIEOffset();
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for (const auto &Desc : Set.descriptors()) {
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uint64_t LowPC = Desc.Address;
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uint64_t HighPC = Desc.getEndAddress();
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appendRange(CUOffset, LowPC, HighPC);
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}
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}
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}
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void DWARFDebugAranges::generate(DWARFContext *CTX) {
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clear();
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if (!CTX)
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return;
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// Extract aranges from .debug_aranges section.
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DataExtractor ArangesData(CTX->getARangeSection(), CTX->isLittleEndian(), 0);
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extract(ArangesData);
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// Generate aranges from DIEs: even if .debug_aranges section is present,
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// it may describe only a small subset of compilation units, so we need to
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// manually build aranges for the rest of them.
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for (const auto &CU : CTX->compile_units()) {
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uint32_t CUOffset = CU->getOffset();
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if (ParsedCUOffsets.insert(CUOffset).second) {
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DWARFAddressRangesVector CURanges;
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CU->collectAddressRanges(CURanges);
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for (const auto &R : CURanges) {
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appendRange(CUOffset, R.first, R.second);
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}
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}
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}
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sortAndMinimize();
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}
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void DWARFDebugAranges::clear() {
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Aranges.clear();
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ParsedCUOffsets.clear();
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}
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void DWARFDebugAranges::appendRange(uint32_t CUOffset, uint64_t LowPC,
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uint64_t HighPC) {
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if (!Aranges.empty()) {
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if (Aranges.back().CUOffset == CUOffset &&
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Aranges.back().HighPC() == LowPC) {
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Aranges.back().setHighPC(HighPC);
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return;
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}
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}
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Aranges.push_back(Range(LowPC, HighPC, CUOffset));
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}
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void DWARFDebugAranges::sortAndMinimize() {
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const size_t orig_arange_size = Aranges.size();
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// Size of one? If so, no sorting is needed
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if (orig_arange_size <= 1)
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return;
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// Sort our address range entries
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std::stable_sort(Aranges.begin(), Aranges.end());
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// Most address ranges are contiguous from function to function
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// so our new ranges will likely be smaller. We calculate the size
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// of the new ranges since although std::vector objects can be resized,
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// the will never reduce their allocated block size and free any excesss
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// memory, so we might as well start a brand new collection so it is as
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// small as possible.
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// First calculate the size of the new minimal arange vector
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// so we don't have to do a bunch of re-allocations as we
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// copy the new minimal stuff over to the new collection.
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size_t minimal_size = 1;
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for (size_t i = 1; i < orig_arange_size; ++i) {
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if (!Range::SortedOverlapCheck(Aranges[i-1], Aranges[i]))
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++minimal_size;
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}
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// Else, make a new RangeColl that _only_ contains what we need.
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RangeColl minimal_aranges;
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minimal_aranges.resize(minimal_size);
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uint32_t j = 0;
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minimal_aranges[j] = Aranges[0];
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for (size_t i = 1; i < orig_arange_size; ++i) {
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if (Range::SortedOverlapCheck(minimal_aranges[j], Aranges[i])) {
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minimal_aranges[j].setHighPC(Aranges[i].HighPC());
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} else {
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// Only increment j if we aren't merging
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minimal_aranges[++j] = Aranges[i];
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}
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}
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assert(j+1 == minimal_size);
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// Now swap our new minimal aranges into place. The local
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// minimal_aranges will then contian the old big collection
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// which will get freed.
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minimal_aranges.swap(Aranges);
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}
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uint32_t DWARFDebugAranges::findAddress(uint64_t Address) const {
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if (!Aranges.empty()) {
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Range range(Address);
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RangeCollIterator begin = Aranges.begin();
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RangeCollIterator end = Aranges.end();
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RangeCollIterator pos =
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std::lower_bound(begin, end, range);
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if (pos != end && pos->containsAddress(Address)) {
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return pos->CUOffset;
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} else if (pos != begin) {
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--pos;
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if (pos->containsAddress(Address))
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return pos->CUOffset;
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}
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}
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return -1U;
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}
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