1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
//===-- ClangHost.cpp -------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ClangHost.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Threading.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/Log.h"
#include <string>
using namespace lldb_private;
static bool VerifyClangPath(const llvm::Twine &clang_path) {
if (FileSystem::Instance().IsDirectory(clang_path))
return true;
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
LLDB_LOGF(log,
"VerifyClangPath(): "
"failed to stat clang resource directory at \"%s\"",
clang_path.str().c_str());
return false;
}
///
/// This will compute the clang resource directory assuming that clang was
/// installed with the same prefix as lldb.
///
/// If verify is true, the first candidate resource directory will be returned.
/// This mode is only used for testing.
///
static bool DefaultComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
FileSpec &file_spec,
bool verify) {
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
std::string raw_path = lldb_shlib_spec.GetPath();
llvm::StringRef parent_dir = llvm::sys::path::parent_path(raw_path);
static const llvm::StringRef kResourceDirSuffixes[] = {
// LLVM.org's build of LLDB uses the clang resource directory placed
// in $install_dir/lib{,64}/clang/$clang_version.
"lib" CLANG_LIBDIR_SUFFIX "/clang/" CLANG_VERSION_STRING,
// swift-lldb uses the clang resource directory copied from swift, which
// by default is placed in $install_dir/lib{,64}/lldb/clang. LLDB places
// it there, so we use LLDB_LIBDIR_SUFFIX.
"lib" LLDB_LIBDIR_SUFFIX "/lldb/clang",
};
for (const auto &Suffix : kResourceDirSuffixes) {
llvm::SmallString<256> clang_dir(parent_dir);
llvm::SmallString<32> relative_path(Suffix);
llvm::sys::path::native(relative_path);
llvm::sys::path::append(clang_dir, relative_path);
if (!verify || VerifyClangPath(clang_dir)) {
LLDB_LOGF(log,
"DefaultComputeClangResourceDir: Setting ClangResourceDir "
"to \"%s\", verify = %s",
clang_dir.str().str().c_str(), verify ? "true" : "false");
file_spec.GetDirectory().SetString(clang_dir);
FileSystem::Instance().Resolve(file_spec);
return true;
}
}
return false;
}
bool lldb_private::ComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
FileSpec &file_spec, bool verify) {
#if !defined(__APPLE__)
return DefaultComputeClangResourceDirectory(lldb_shlib_spec, file_spec,
verify);
#else
std::string raw_path = lldb_shlib_spec.GetPath();
auto rev_it = llvm::sys::path::rbegin(raw_path);
auto r_end = llvm::sys::path::rend(raw_path);
// Check for a Posix-style build of LLDB.
while (rev_it != r_end) {
if (*rev_it == "LLDB.framework")
break;
++rev_it;
}
// We found a non-framework build of LLDB
if (rev_it == r_end)
return DefaultComputeClangResourceDirectory(lldb_shlib_spec, file_spec,
verify);
// Inside Xcode and in Xcode toolchains LLDB is always in lockstep
// with the Swift compiler, so it can reuse its Clang resource
// directory. This allows LLDB and the Swift compiler to share the
// same Clang module cache.
llvm::SmallString<256> clang_path;
const char *swift_clang_resource_dir = "usr/lib/swift/clang";
auto parent = std::next(rev_it);
if (parent != r_end && *parent == "SharedFrameworks") {
// This is the top-level LLDB in the Xcode.app bundle.
// E.g., "Xcode.app/Contents/SharedFrameworks/LLDB.framework/Versions/A"
raw_path.resize(parent - r_end);
llvm::sys::path::append(clang_path, raw_path,
"Developer/Toolchains/XcodeDefault.xctoolchain",
swift_clang_resource_dir);
if (!verify || VerifyClangPath(clang_path)) {
file_spec.GetDirectory().SetString(clang_path.c_str());
FileSystem::Instance().Resolve(file_spec);
return true;
}
} else if (parent != r_end && *parent == "PrivateFrameworks" &&
std::distance(parent, r_end) > 2) {
++parent;
++parent;
if (*parent == "System") {
// This is LLDB inside an Xcode toolchain.
// E.g., "Xcode.app/Contents/Developer/Toolchains/" \
// "My.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework"
raw_path.resize(parent - r_end);
llvm::sys::path::append(clang_path, raw_path, swift_clang_resource_dir);
if (!verify || VerifyClangPath(clang_path)) {
file_spec.GetDirectory().SetString(clang_path.c_str());
FileSystem::Instance().Resolve(file_spec);
return true;
}
raw_path = lldb_shlib_spec.GetPath();
}
raw_path.resize(rev_it - r_end);
} else {
raw_path.resize(rev_it - r_end);
}
// Fall back to the Clang resource directory inside the framework.
raw_path.append("LLDB.framework/Resources/Clang");
file_spec.GetDirectory().SetString(raw_path.c_str());
FileSystem::Instance().Resolve(file_spec);
return true;
#endif // __APPLE__
}
FileSpec lldb_private::GetClangResourceDir() {
static FileSpec g_cached_resource_dir;
static llvm::once_flag g_once_flag;
llvm::call_once(g_once_flag, []() {
if (FileSpec lldb_file_spec = HostInfo::GetShlibDir())
ComputeClangResourceDirectory(lldb_file_spec, g_cached_resource_dir,
true);
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
LLDB_LOGF(log, "GetClangResourceDir() => '%s'",
g_cached_resource_dir.GetPath().c_str());
});
return g_cached_resource_dir;
}
|
