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f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
102 lines
4.1 KiB
C++
102 lines
4.1 KiB
C++
//===-- DWARFDebugArangeSet.cpp -------------------------------------------===//
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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 "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 DWARFDebugArangeSet::clear() {
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Offset = -1U;
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std::memset(&HeaderData, 0, sizeof(Header));
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ArangeDescriptors.clear();
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}
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bool
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DWARFDebugArangeSet::extract(DataExtractor data, uint32_t *offset_ptr) {
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if (data.isValidOffset(*offset_ptr)) {
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ArangeDescriptors.clear();
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Offset = *offset_ptr;
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// 7.20 Address Range Table
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//
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// Each set of entries in the table of address ranges contained in
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// the .debug_aranges section begins with a header consisting of: a
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// 4-byte length containing the length of the set of entries for this
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// compilation unit, not including the length field itself; a 2-byte
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// version identifier containing the value 2 for DWARF Version 2; a
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// 4-byte offset into the.debug_infosection; a 1-byte unsigned integer
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// containing the size in bytes of an address (or the offset portion of
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// an address for segmented addressing) on the target system; and a
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// 1-byte unsigned integer containing the size in bytes of a segment
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// descriptor on the target system. This header is followed by a series
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// of tuples. Each tuple consists of an address and a length, each in
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// the size appropriate for an address on the target architecture.
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HeaderData.Length = data.getU32(offset_ptr);
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HeaderData.Version = data.getU16(offset_ptr);
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HeaderData.CuOffset = data.getU32(offset_ptr);
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HeaderData.AddrSize = data.getU8(offset_ptr);
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HeaderData.SegSize = data.getU8(offset_ptr);
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// Perform basic validation of the header fields.
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if (!data.isValidOffsetForDataOfSize(Offset, HeaderData.Length) ||
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(HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8)) {
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clear();
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return false;
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}
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// The first tuple following the header in each set begins at an offset
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// that is a multiple of the size of a single tuple (that is, twice the
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// size of an address). The header is padded, if necessary, to the
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// appropriate boundary.
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const uint32_t header_size = *offset_ptr - Offset;
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const uint32_t tuple_size = HeaderData.AddrSize * 2;
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uint32_t first_tuple_offset = 0;
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while (first_tuple_offset < header_size)
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first_tuple_offset += tuple_size;
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*offset_ptr = Offset + first_tuple_offset;
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Descriptor arangeDescriptor;
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assert(sizeof(arangeDescriptor.Address) == sizeof(arangeDescriptor.Length));
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assert(sizeof(arangeDescriptor.Address) >= HeaderData.AddrSize);
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while (data.isValidOffset(*offset_ptr)) {
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arangeDescriptor.Address = data.getUnsigned(offset_ptr, HeaderData.AddrSize);
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arangeDescriptor.Length = data.getUnsigned(offset_ptr, HeaderData.AddrSize);
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// Each set of tuples is terminated by a 0 for the address and 0
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// for the length.
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if (arangeDescriptor.Address || arangeDescriptor.Length)
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ArangeDescriptors.push_back(arangeDescriptor);
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else
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break; // We are done if we get a zero address and length
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}
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return !ArangeDescriptors.empty();
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}
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return false;
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}
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void DWARFDebugArangeSet::dump(raw_ostream &OS) const {
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OS << format("Address Range Header: length = 0x%8.8x, version = 0x%4.4x, ",
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HeaderData.Length, HeaderData.Version)
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<< format("cu_offset = 0x%8.8x, addr_size = 0x%2.2x, seg_size = 0x%2.2x\n",
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HeaderData.CuOffset, HeaderData.AddrSize, HeaderData.SegSize);
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const uint32_t hex_width = HeaderData.AddrSize * 2;
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for (DescriptorConstIter pos = ArangeDescriptors.begin(),
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end = ArangeDescriptors.end(); pos != end; ++pos)
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OS << format("[0x%*.*" PRIx64 " -", hex_width, hex_width, pos->Address)
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<< format(" 0x%*.*" PRIx64 ")\n",
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hex_width, hex_width, pos->getEndAddress());
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}
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