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f3ecbfc164
We use UUID::fromOptionalData to read UUID's from the Mach-O files, so UUID's of all 0's are invalid UUID's. We also get uuid's from debugserver, which need to match the file UUID's. So we need an API that treats "000000000" as invalid as well. Added that and use it. Differential Revision: https://reviews.llvm.org/D57195 llvm-svn: 352122
124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
//===-- UUID.cpp ------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/UUID.h"
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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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#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 { s->PutCString(GetAsString()); }
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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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size_t UUID::SetFromOptionalStringRef(llvm::StringRef str,
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uint32_t num_uuid_bytes) {
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size_t num_chars_consumed = SetFromStringRef(str, num_uuid_bytes);
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if (num_chars_consumed) {
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if (llvm::all_of(m_bytes, [](uint8_t b) { return b == 0; }))
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Clear();
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}
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return num_chars_consumed;
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}
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