1//===- Formatters.cpp -----------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "llvm/DebugInfo/CodeView/Formatters.h"
10#include "llvm/ADT/ArrayRef.h"
11#include "llvm/DebugInfo/CodeView/GUID.h"
12#include "llvm/Support/Endian.h"
13#include "llvm/Support/ErrorHandling.h"
14#include "llvm/Support/Format.h"
15#include "llvm/Support/raw_ostream.h"
16#include <cassert>
17
18using namespace llvm;
19using namespace llvm::codeview;
20using namespace llvm::codeview::detail;
21
22GuidAdapter::GuidAdapter(StringRef Guid)
23 : FormatAdapter(ArrayRef(Guid.bytes_begin(), Guid.bytes_end())) {}
24
25GuidAdapter::GuidAdapter(ArrayRef<uint8_t> Guid)
26 : FormatAdapter(std::move(Guid)) {}
27
28// From https://docs.microsoft.com/en-us/windows/win32/msi/guid documentation:
29// The GUID data type is a text string representing a Class identifier (ID).
30// All GUIDs must be authored in uppercase.
31// The valid format for a GUID is {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX} where
32// X is a hex digit (0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F).
33//
34// The individual string components must be padded to comply with the specific
35// lengths of {8-4-4-4-12} characters.
36// The llvm-yaml2obj tool checks that a GUID follow that format:
37// - the total length to be 38 (including the curly braces.
38// - there is a dash at the positions: 8, 13, 18 and 23.
39void GuidAdapter::format(raw_ostream &Stream, StringRef Style) {
40 assert(Item.size() == 16 && "Expected 16-byte GUID");
41 struct MSGuid {
42 support::ulittle32_t Data1;
43 support::ulittle16_t Data2;
44 support::ulittle16_t Data3;
45 support::ubig64_t Data4;
46 };
47 const MSGuid *G = reinterpret_cast<const MSGuid *>(Item.data());
48 Stream
49 << '{' << format_hex_no_prefix(N: G->Data1, Width: 8, /*Upper=*/true)
50 << '-' << format_hex_no_prefix(N: G->Data2, Width: 4, /*Upper=*/true)
51 << '-' << format_hex_no_prefix(N: G->Data3, Width: 4, /*Upper=*/true)
52 << '-' << format_hex_no_prefix(N: G->Data4 >> 48, Width: 4, /*Upper=*/true) << '-'
53 << format_hex_no_prefix(N: G->Data4 & ((1ULL << 48) - 1), Width: 12, /*Upper=*/true)
54 << '}';
55}
56
57raw_ostream &llvm::codeview::operator<<(raw_ostream &OS, const GUID &Guid) {
58 codeview::detail::GuidAdapter A(Guid.Guid);
59 A.format(Stream&: OS, Style: "");
60 return OS;
61}
62

source code of llvm/lib/DebugInfo/CodeView/Formatters.cpp