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318 lines
9.7 KiB
318 lines
9.7 KiB
//===-- PathMappingList.cpp -----------------------------------------------===//
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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 <climits>
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#include <cstring>
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#include "lldb/Host/FileSystem.h"
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#include "lldb/Host/PosixApi.h"
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#include "lldb/Target/PathMappingList.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/Stream.h"
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#include "lldb/lldb-private-enumerations.h"
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using namespace lldb;
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using namespace lldb_private;
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namespace {
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// We must normalize our path pairs that we store because if we don't then
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// things won't always work. We found a case where if we did:
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// (lldb) settings set target.source-map . /tmp
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// We would store a path pairs of "." and "/tmp" as raw strings. If the debug
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// info contains "./foo/bar.c", the path will get normalized to "foo/bar.c".
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// When PathMappingList::RemapPath() is called, it expects the path to start
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// with the raw path pair, which doesn't work anymore because the paths have
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// been normalized when the debug info was loaded. So we need to store
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// nomalized path pairs to ensure things match up.
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ConstString NormalizePath(ConstString path) {
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// If we use "path" to construct a FileSpec, it will normalize the path for
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// us. We then grab the string and turn it back into a ConstString.
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return ConstString(FileSpec(path.GetStringRef()).GetPath());
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}
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}
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// PathMappingList constructor
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PathMappingList::PathMappingList()
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: m_pairs(), m_callback(nullptr), m_callback_baton(nullptr), m_mod_id(0) {}
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PathMappingList::PathMappingList(ChangedCallback callback, void *callback_baton)
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: m_pairs(), m_callback(callback), m_callback_baton(callback_baton),
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m_mod_id(0) {}
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PathMappingList::PathMappingList(const PathMappingList &rhs)
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: m_pairs(rhs.m_pairs), m_callback(nullptr), m_callback_baton(nullptr),
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m_mod_id(0) {}
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const PathMappingList &PathMappingList::operator=(const PathMappingList &rhs) {
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if (this != &rhs) {
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m_pairs = rhs.m_pairs;
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m_callback = nullptr;
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m_callback_baton = nullptr;
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m_mod_id = rhs.m_mod_id;
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}
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return *this;
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}
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PathMappingList::~PathMappingList() = default;
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void PathMappingList::Append(ConstString path,
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ConstString replacement, bool notify) {
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++m_mod_id;
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m_pairs.emplace_back(pair(NormalizePath(path), NormalizePath(replacement)));
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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}
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void PathMappingList::Append(const PathMappingList &rhs, bool notify) {
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++m_mod_id;
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if (!rhs.m_pairs.empty()) {
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const_iterator pos, end = rhs.m_pairs.end();
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for (pos = rhs.m_pairs.begin(); pos != end; ++pos)
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m_pairs.push_back(*pos);
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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}
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}
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void PathMappingList::Insert(ConstString path,
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ConstString replacement, uint32_t index,
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bool notify) {
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++m_mod_id;
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iterator insert_iter;
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if (index >= m_pairs.size())
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insert_iter = m_pairs.end();
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else
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insert_iter = m_pairs.begin() + index;
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m_pairs.emplace(insert_iter, pair(NormalizePath(path),
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NormalizePath(replacement)));
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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}
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bool PathMappingList::Replace(ConstString path,
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ConstString replacement, uint32_t index,
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bool notify) {
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if (index >= m_pairs.size())
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return false;
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++m_mod_id;
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m_pairs[index] = pair(NormalizePath(path), NormalizePath(replacement));
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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return true;
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}
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bool PathMappingList::Remove(size_t index, bool notify) {
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if (index >= m_pairs.size())
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return false;
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++m_mod_id;
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iterator iter = m_pairs.begin() + index;
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m_pairs.erase(iter);
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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return true;
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}
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// For clients which do not need the pair index dumped, pass a pair_index >= 0
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// to only dump the indicated pair.
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void PathMappingList::Dump(Stream *s, int pair_index) {
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unsigned int numPairs = m_pairs.size();
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if (pair_index < 0) {
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unsigned int index;
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for (index = 0; index < numPairs; ++index)
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s->Printf("[%d] \"%s\" -> \"%s\"\n", index,
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m_pairs[index].first.GetCString(),
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m_pairs[index].second.GetCString());
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} else {
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if (static_cast<unsigned int>(pair_index) < numPairs)
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s->Printf("%s -> %s", m_pairs[pair_index].first.GetCString(),
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m_pairs[pair_index].second.GetCString());
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}
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}
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void PathMappingList::Clear(bool notify) {
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if (!m_pairs.empty())
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++m_mod_id;
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m_pairs.clear();
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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}
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bool PathMappingList::RemapPath(ConstString path,
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ConstString &new_path) const {
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std::string remapped;
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if (RemapPath(path.GetStringRef(), remapped)) {
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new_path.SetString(remapped);
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return true;
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}
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return false;
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}
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bool PathMappingList::RemapPath(llvm::StringRef path,
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std::string &new_path) const {
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if (m_pairs.empty() || path.empty())
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return false;
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LazyBool path_is_relative = eLazyBoolCalculate;
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for (const auto &it : m_pairs) {
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auto prefix = it.first.GetStringRef();
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if (!path.consume_front(prefix)) {
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// Relative paths won't have a leading "./" in them unless "." is the
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// only thing in the relative path so we need to work around "."
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// carefully.
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if (prefix != ".")
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continue;
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// We need to figure out if the "path" argument is relative. If it is,
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// then we should remap, else skip this entry.
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if (path_is_relative == eLazyBoolCalculate) {
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path_is_relative =
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FileSpec(path).IsRelative() ? eLazyBoolYes : eLazyBoolNo;
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}
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if (!path_is_relative)
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continue;
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}
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FileSpec remapped(it.second.GetStringRef());
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remapped.AppendPathComponent(path);
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new_path = remapped.GetPath();
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return true;
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}
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return false;
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}
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bool PathMappingList::ReverseRemapPath(const FileSpec &file, FileSpec &fixed) const {
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std::string path = file.GetPath();
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llvm::StringRef path_ref(path);
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for (const auto &it : m_pairs) {
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if (!path_ref.consume_front(it.second.GetStringRef()))
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continue;
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fixed.SetFile(it.first.GetStringRef(), FileSpec::Style::native);
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fixed.AppendPathComponent(path_ref);
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return true;
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}
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return false;
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}
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bool PathMappingList::FindFile(const FileSpec &orig_spec,
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FileSpec &new_spec) const {
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if (m_pairs.empty())
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return false;
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std::string orig_path = orig_spec.GetPath();
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if (orig_path.empty())
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return false;
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bool orig_is_relative = orig_spec.IsRelative();
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for (auto entry : m_pairs) {
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llvm::StringRef orig_ref(orig_path);
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llvm::StringRef prefix_ref = entry.first.GetStringRef();
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if (orig_ref.size() < prefix_ref.size())
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continue;
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// We consider a relative prefix or one of just "." to
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// mean "only apply to relative paths".
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bool prefix_is_relative = false;
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if (prefix_ref == ".") {
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prefix_is_relative = true;
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// Remove the "." since it will have been removed from the
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// FileSpec paths already.
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prefix_ref = prefix_ref.drop_front();
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} else {
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FileSpec prefix_spec(prefix_ref, FileSpec::Style::native);
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prefix_is_relative = prefix_spec.IsRelative();
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}
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if (prefix_is_relative != orig_is_relative)
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continue;
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if (orig_ref.consume_front(prefix_ref)) {
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new_spec.SetFile(entry.second.GetCString(), FileSpec::Style::native);
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new_spec.AppendPathComponent(orig_ref);
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if (FileSystem::Instance().Exists(new_spec))
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return true;
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}
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}
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new_spec.Clear();
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return false;
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}
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bool PathMappingList::Replace(ConstString path,
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ConstString new_path, bool notify) {
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uint32_t idx = FindIndexForPath(path);
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if (idx < m_pairs.size()) {
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++m_mod_id;
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m_pairs[idx].second = new_path;
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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return true;
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}
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return false;
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}
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bool PathMappingList::Remove(ConstString path, bool notify) {
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iterator pos = FindIteratorForPath(path);
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if (pos != m_pairs.end()) {
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++m_mod_id;
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m_pairs.erase(pos);
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if (notify && m_callback)
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m_callback(*this, m_callback_baton);
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return true;
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}
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return false;
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}
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PathMappingList::const_iterator
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PathMappingList::FindIteratorForPath(ConstString path) const {
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const_iterator pos;
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const_iterator begin = m_pairs.begin();
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const_iterator end = m_pairs.end();
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for (pos = begin; pos != end; ++pos) {
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if (pos->first == path)
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break;
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}
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return pos;
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}
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PathMappingList::iterator
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PathMappingList::FindIteratorForPath(ConstString path) {
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iterator pos;
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iterator begin = m_pairs.begin();
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iterator end = m_pairs.end();
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for (pos = begin; pos != end; ++pos) {
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if (pos->first == path)
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break;
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}
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return pos;
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}
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bool PathMappingList::GetPathsAtIndex(uint32_t idx, ConstString &path,
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ConstString &new_path) const {
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if (idx < m_pairs.size()) {
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path = m_pairs[idx].first;
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new_path = m_pairs[idx].second;
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return true;
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}
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return false;
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}
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uint32_t PathMappingList::FindIndexForPath(ConstString orig_path) const {
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const ConstString path = NormalizePath(orig_path);
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const_iterator pos;
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const_iterator begin = m_pairs.begin();
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const_iterator end = m_pairs.end();
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for (pos = begin; pos != end; ++pos) {
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if (pos->first == path)
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return std::distance(begin, pos);
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}
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return UINT32_MAX;
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}
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