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//===-- RealpathPrefixes.cpp ----------------------------------------------===//
//
// 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 "lldb/Utility/RealpathPrefixes.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/FileSpecList.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/lldb-private-types.h"
using namespace lldb_private;
RealpathPrefixes::RealpathPrefixes(
const FileSpecList &file_spec_list,
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs)
: m_fs(fs) {
m_prefixes.reserve(file_spec_list.GetSize());
for (const FileSpec &file_spec : file_spec_list) {
m_prefixes.emplace_back(file_spec.GetPath());
}
}
std::optional<FileSpec>
RealpathPrefixes::ResolveSymlinks(const FileSpec &file_spec) {
if (m_prefixes.empty())
return std::nullopt;
// Test if `b` is a *path* prefix of `a` (not just *string* prefix).
// E.g. "/foo/bar" is a path prefix of "/foo/bar/baz" but not "/foo/barbaz".
auto is_path_prefix = [](llvm::StringRef a, llvm::StringRef b,
bool case_sensitive,
llvm::sys::path::Style style) -> bool {
if (case_sensitive ? a.consume_front(b) : a.consume_front_insensitive(b))
// If `b` isn't "/", then it won't end with "/" because it comes from
// `FileSpec`. After `a` consumes `b`, `a` should either be empty (i.e.
// `a` == `b`) or end with "/" (the remainder of `a` is a subdirectory).
return b == "/" || a.empty() ||
llvm::sys::path::is_separator(a[0], style);
return false;
};
std::string file_spec_path = file_spec.GetPath();
for (const std::string &prefix : m_prefixes) {
if (is_path_prefix(file_spec_path, prefix, file_spec.IsCaseSensitive(),
file_spec.GetPathStyle())) {
// Stats and logging.
IncreaseSourceRealpathAttemptCount();
Log *log = GetLog(LLDBLog::Source);
LLDB_LOGF(log, "Realpath'ing support file %s", file_spec_path.c_str());
// One prefix matched. Try to realpath.
PathSmallString buff;
std::error_code ec = m_fs->getRealPath(file_spec_path, buff);
if (ec)
return std::nullopt;
FileSpec realpath(buff, file_spec.GetPathStyle());
// Only return realpath if it is different from the original file_spec.
if (realpath != file_spec)
return realpath;
return std::nullopt;
}
}
// No prefix matched
return std::nullopt;
}
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