77c397f465
Summary: The data structure is optimized for the case where the UUID size is <= 20 bytes (standard length emitted by the GNU linkers), but larger sizes are also possible. I've modified the string conversion function to support the new sizes as well. For standard UUIDs it maintains the traditional formatting (4-2-2-2-6). If a UUID is shorter, we just cut this sequence short, and for longer UUIDs it will just repeat the last 6-byte block as long as necessary. I've also modified ObjectFileELF to take advantage of the new UUIDs and avoid manually padding the UUID to 16 bytes. While there, I also made sure the computed UUID does not depend on host endianness. Reviewers: clayborg, lemo, sas, davide, espindola Subscribers: emaste, arichardson, lldb-commits Differential Revision: https://reviews.llvm.org/D48633 llvm-svn: 335963
118 lines
3.0 KiB
C++
118 lines
3.0 KiB
C++
//===-- UUID.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 "lldb/Utility/UUID.h"
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Utility/Stream.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Format.h"
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// C Includes
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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using namespace lldb_private;
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// Whether to put a separator after count uuid bytes.
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// For the first 16 bytes we follow the traditional UUID format. After that, we
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// simply put a dash after every 6 bytes.
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static inline bool separate(size_t count) {
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if (count >= 10)
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return (count - 10) % 6 == 0;
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switch (count) {
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case 4:
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case 6:
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case 8:
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return true;
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default:
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return false;
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}
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}
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std::string UUID::GetAsString(llvm::StringRef separator) const {
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std::string result;
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llvm::raw_string_ostream os(result);
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for (auto B : llvm::enumerate(GetBytes())) {
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if (separate(B.index()))
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os << separator;
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os << llvm::format_hex_no_prefix(B.value(), 2, true);
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}
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os.flush();
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return result;
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}
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void UUID::Dump(Stream *s) const {
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s->PutCString(GetAsString().c_str());
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}
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static inline int xdigit_to_int(char ch) {
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ch = tolower(ch);
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if (ch >= 'a' && ch <= 'f')
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return 10 + ch - 'a';
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return ch - '0';
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}
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llvm::StringRef
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UUID::DecodeUUIDBytesFromString(llvm::StringRef p,
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llvm::SmallVectorImpl<uint8_t> &uuid_bytes,
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uint32_t num_uuid_bytes) {
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uuid_bytes.clear();
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while (!p.empty()) {
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if (isxdigit(p[0]) && isxdigit(p[1])) {
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int hi_nibble = xdigit_to_int(p[0]);
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int lo_nibble = xdigit_to_int(p[1]);
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// Translate the two hex nibble characters into a byte
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uuid_bytes.push_back((hi_nibble << 4) + lo_nibble);
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// Skip both hex digits
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p = p.drop_front(2);
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// Increment the byte that we are decoding within the UUID value and
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// break out if we are done
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if (uuid_bytes.size() == num_uuid_bytes)
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break;
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} else if (p.front() == '-') {
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// Skip dashes
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p = p.drop_front();
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} else {
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// UUID values can only consist of hex characters and '-' chars
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break;
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}
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}
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return p;
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}
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size_t UUID::SetFromStringRef(llvm::StringRef str, uint32_t num_uuid_bytes) {
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llvm::StringRef p = str;
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// Skip leading whitespace characters
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p = p.ltrim();
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llvm::SmallVector<uint8_t, 20> bytes;
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llvm::StringRef rest =
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UUID::DecodeUUIDBytesFromString(p, bytes, num_uuid_bytes);
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// If we successfully decoded a UUID, return the amount of characters that
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// were consumed
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if (bytes.size() == num_uuid_bytes) {
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*this = fromData(bytes);
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return str.size() - rest.size();
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}
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// Else return zero to indicate we were not able to parse a UUID value
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return 0;
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}
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