a0b20b5d1f
This contains many improvements, primarily better C++ support, an integrated assembler for x86 and support for -pg.
775 lines
19 KiB
C++
775 lines
19 KiB
C++
//===-- PathV2.cpp - Implement OS Path Concept ------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the operating system PathV2 API.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/PathV2.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cctype>
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#include <cstdio>
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#include <cstring>
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namespace {
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using llvm::StringRef;
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using llvm::sys::path::is_separator;
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#ifdef LLVM_ON_WIN32
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const StringRef separators = "\\/";
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const char prefered_separator = '\\';
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#else
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const StringRef separators = "/";
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const char prefered_separator = '/';
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#endif
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const llvm::error_code success;
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StringRef find_first_component(StringRef path) {
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// Look for this first component in the following order.
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// * empty (in this case we return an empty string)
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// * either C: or {//,\\}net.
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// * {/,\}
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// * {.,..}
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// * {file,directory}name
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if (path.empty())
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return path;
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#ifdef LLVM_ON_WIN32
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// C:
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if (path.size() >= 2 && std::isalpha(path[0]) && path[1] == ':')
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return path.substr(0, 2);
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#endif
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// //net
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if ((path.size() > 2) &&
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is_separator(path[0]) &&
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path[0] == path[1] &&
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!is_separator(path[2])) {
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// Find the next directory separator.
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size_t end = path.find_first_of(separators, 2);
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return path.substr(0, end);
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}
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// {/,\}
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if (is_separator(path[0]))
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return path.substr(0, 1);
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if (path.startswith(".."))
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return path.substr(0, 2);
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if (path[0] == '.')
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return path.substr(0, 1);
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// * {file,directory}name
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size_t end = path.find_first_of(separators, 2);
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return path.substr(0, end);
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}
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size_t filename_pos(StringRef str) {
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if (str.size() == 2 &&
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is_separator(str[0]) &&
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str[0] == str[1])
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return 0;
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if (str.size() > 0 && is_separator(str[str.size() - 1]))
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return str.size() - 1;
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size_t pos = str.find_last_of(separators, str.size() - 1);
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#ifdef LLVM_ON_WIN32
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if (pos == StringRef::npos)
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pos = str.find_last_of(':', str.size() - 2);
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#endif
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if (pos == StringRef::npos ||
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(pos == 1 && is_separator(str[0])))
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return 0;
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return pos + 1;
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}
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size_t root_dir_start(StringRef str) {
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// case "c:/"
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#ifdef LLVM_ON_WIN32
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if (str.size() > 2 &&
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str[1] == ':' &&
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is_separator(str[2]))
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return 2;
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#endif
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// case "//"
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if (str.size() == 2 &&
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is_separator(str[0]) &&
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str[0] == str[1])
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return StringRef::npos;
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// case "//net"
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if (str.size() > 3 &&
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is_separator(str[0]) &&
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str[0] == str[1] &&
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!is_separator(str[2])) {
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return str.find_first_of(separators, 2);
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}
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// case "/"
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if (str.size() > 0 && is_separator(str[0]))
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return 0;
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return StringRef::npos;
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}
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size_t parent_path_end(StringRef path) {
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size_t end_pos = filename_pos(path);
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bool filename_was_sep = path.size() > 0 && is_separator(path[end_pos]);
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// Skip separators except for root dir.
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size_t root_dir_pos = root_dir_start(path.substr(0, end_pos));
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while(end_pos > 0 &&
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(end_pos - 1) != root_dir_pos &&
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is_separator(path[end_pos - 1]))
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--end_pos;
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if (end_pos == 1 && root_dir_pos == 0 && filename_was_sep)
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return StringRef::npos;
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return end_pos;
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}
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} // end unnamed namespace
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namespace llvm {
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namespace sys {
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namespace path {
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const_iterator begin(StringRef path) {
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const_iterator i;
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i.Path = path;
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i.Component = find_first_component(path);
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i.Position = 0;
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return i;
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}
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const_iterator end(StringRef path) {
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const_iterator i;
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i.Path = path;
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i.Position = path.size();
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return i;
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}
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const_iterator &const_iterator::operator++() {
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assert(Position < Path.size() && "Tried to increment past end!");
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// Increment Position to past the current component
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Position += Component.size();
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// Check for end.
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if (Position == Path.size()) {
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Component = StringRef();
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return *this;
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}
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// Both POSIX and Windows treat paths that begin with exactly two separators
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// specially.
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bool was_net = Component.size() > 2 &&
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is_separator(Component[0]) &&
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Component[1] == Component[0] &&
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!is_separator(Component[2]);
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// Handle separators.
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if (is_separator(Path[Position])) {
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// Root dir.
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if (was_net
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#ifdef LLVM_ON_WIN32
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// c:/
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|| Component.endswith(":")
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#endif
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) {
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Component = Path.substr(Position, 1);
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return *this;
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}
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// Skip extra separators.
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while (Position != Path.size() &&
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is_separator(Path[Position])) {
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++Position;
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}
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// Treat trailing '/' as a '.'.
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if (Position == Path.size()) {
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--Position;
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Component = ".";
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return *this;
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}
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}
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// Find next component.
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size_t end_pos = Path.find_first_of(separators, Position);
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Component = Path.slice(Position, end_pos);
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return *this;
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}
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const_iterator &const_iterator::operator--() {
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// If we're at the end and the previous char was a '/', return '.'.
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if (Position == Path.size() &&
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Path.size() > 1 &&
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is_separator(Path[Position - 1])
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#ifdef LLVM_ON_WIN32
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&& Path[Position - 2] != ':'
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#endif
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) {
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--Position;
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Component = ".";
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return *this;
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}
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// Skip separators unless it's the root directory.
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size_t root_dir_pos = root_dir_start(Path);
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size_t end_pos = Position;
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while(end_pos > 0 &&
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(end_pos - 1) != root_dir_pos &&
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is_separator(Path[end_pos - 1]))
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--end_pos;
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// Find next separator.
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size_t start_pos = filename_pos(Path.substr(0, end_pos));
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Component = Path.slice(start_pos, end_pos);
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Position = start_pos;
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return *this;
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}
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bool const_iterator::operator==(const const_iterator &RHS) const {
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return Path.begin() == RHS.Path.begin() &&
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Position == RHS.Position;
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}
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bool const_iterator::operator!=(const const_iterator &RHS) const {
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return !(*this == RHS);
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}
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ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const {
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return Position - RHS.Position;
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}
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const StringRef root_path(StringRef path) {
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const_iterator b = begin(path),
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pos = b,
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e = end(path);
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if (b != e) {
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bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
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bool has_drive =
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#ifdef LLVM_ON_WIN32
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b->endswith(":");
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#else
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false;
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#endif
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if (has_net || has_drive) {
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if ((++pos != e) && is_separator((*pos)[0])) {
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// {C:/,//net/}, so get the first two components.
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return path.substr(0, b->size() + pos->size());
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} else {
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// just {C:,//net}, return the first component.
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return *b;
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}
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}
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// POSIX style root directory.
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if (is_separator((*b)[0])) {
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return *b;
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}
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}
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return StringRef();
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}
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const StringRef root_name(StringRef path) {
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const_iterator b = begin(path),
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e = end(path);
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if (b != e) {
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bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
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bool has_drive =
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#ifdef LLVM_ON_WIN32
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b->endswith(":");
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#else
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false;
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#endif
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if (has_net || has_drive) {
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// just {C:,//net}, return the first component.
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return *b;
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}
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}
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// No path or no name.
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return StringRef();
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}
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const StringRef root_directory(StringRef path) {
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const_iterator b = begin(path),
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pos = b,
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e = end(path);
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if (b != e) {
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bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
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bool has_drive =
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#ifdef LLVM_ON_WIN32
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b->endswith(":");
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#else
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false;
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#endif
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if ((has_net || has_drive) &&
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// {C:,//net}, skip to the next component.
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(++pos != e) && is_separator((*pos)[0])) {
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return *pos;
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}
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// POSIX style root directory.
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if (!has_net && is_separator((*b)[0])) {
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return *b;
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}
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}
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// No path or no root.
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return StringRef();
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}
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const StringRef relative_path(StringRef path) {
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StringRef root = root_path(path);
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return root.substr(root.size());
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}
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void append(SmallVectorImpl<char> &path, const Twine &a,
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const Twine &b,
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const Twine &c,
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const Twine &d) {
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SmallString<32> a_storage;
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SmallString<32> b_storage;
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SmallString<32> c_storage;
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SmallString<32> d_storage;
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SmallVector<StringRef, 4> components;
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if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage));
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if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage));
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if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage));
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if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage));
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for (SmallVectorImpl<StringRef>::const_iterator i = components.begin(),
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e = components.end();
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i != e; ++i) {
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bool path_has_sep = !path.empty() && is_separator(path[path.size() - 1]);
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bool component_has_sep = !i->empty() && is_separator((*i)[0]);
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bool is_root_name = has_root_name(*i);
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if (path_has_sep) {
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// Strip separators from beginning of component.
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size_t loc = i->find_first_not_of(separators);
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StringRef c = i->substr(loc);
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// Append it.
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path.append(c.begin(), c.end());
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continue;
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}
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if (!component_has_sep && !(path.empty() || is_root_name)) {
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// Add a separator.
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path.push_back(prefered_separator);
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}
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path.append(i->begin(), i->end());
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}
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}
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void append(SmallVectorImpl<char> &path,
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const_iterator begin, const_iterator end) {
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for (; begin != end; ++begin)
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path::append(path, *begin);
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}
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const StringRef parent_path(StringRef path) {
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size_t end_pos = parent_path_end(path);
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if (end_pos == StringRef::npos)
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return StringRef();
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else
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return path.substr(0, end_pos);
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}
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void remove_filename(SmallVectorImpl<char> &path) {
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size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()));
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if (end_pos != StringRef::npos)
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path.set_size(end_pos);
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}
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void replace_extension(SmallVectorImpl<char> &path, const Twine &extension) {
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StringRef p(path.begin(), path.size());
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SmallString<32> ext_storage;
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StringRef ext = extension.toStringRef(ext_storage);
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// Erase existing extension.
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size_t pos = p.find_last_of('.');
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if (pos != StringRef::npos && pos >= filename_pos(p))
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path.set_size(pos);
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// Append '.' if needed.
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if (ext.size() > 0 && ext[0] != '.')
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path.push_back('.');
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// Append extension.
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path.append(ext.begin(), ext.end());
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}
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void native(const Twine &path, SmallVectorImpl<char> &result) {
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// Clear result.
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result.clear();
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#ifdef LLVM_ON_WIN32
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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result.reserve(p.size());
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for (StringRef::const_iterator i = p.begin(),
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e = p.end();
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i != e;
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++i) {
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if (*i == '/')
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result.push_back('\\');
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else
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result.push_back(*i);
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}
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#else
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path.toVector(result);
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#endif
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}
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const StringRef filename(StringRef path) {
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return *(--end(path));
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}
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const StringRef stem(StringRef path) {
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StringRef fname = filename(path);
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size_t pos = fname.find_last_of('.');
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if (pos == StringRef::npos)
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return fname;
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else
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if ((fname.size() == 1 && fname == ".") ||
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(fname.size() == 2 && fname == ".."))
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return fname;
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else
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return fname.substr(0, pos);
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}
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const StringRef extension(StringRef path) {
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StringRef fname = filename(path);
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size_t pos = fname.find_last_of('.');
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if (pos == StringRef::npos)
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return StringRef();
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else
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if ((fname.size() == 1 && fname == ".") ||
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(fname.size() == 2 && fname == ".."))
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return StringRef();
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else
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return fname.substr(pos);
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}
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bool is_separator(char value) {
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switch(value) {
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#ifdef LLVM_ON_WIN32
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case '\\': // fall through
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#endif
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case '/': return true;
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default: return false;
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}
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}
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bool has_root_name(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !root_name(p).empty();
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}
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bool has_root_directory(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !root_directory(p).empty();
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}
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bool has_root_path(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !root_path(p).empty();
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}
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bool has_relative_path(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !relative_path(p).empty();
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}
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bool has_filename(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !filename(p).empty();
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}
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bool has_parent_path(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !parent_path(p).empty();
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}
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bool has_stem(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !stem(p).empty();
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}
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bool has_extension(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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return !extension(p).empty();
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}
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bool is_absolute(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toStringRef(path_storage);
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bool rootDir = has_root_directory(p),
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#ifdef LLVM_ON_WIN32
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rootName = has_root_name(p);
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#else
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rootName = true;
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#endif
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return rootDir && rootName;
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}
|
|
|
|
bool is_relative(const Twine &path) {
|
|
return !is_absolute(path);
|
|
}
|
|
|
|
} // end namespace path
|
|
|
|
namespace fs {
|
|
|
|
error_code make_absolute(SmallVectorImpl<char> &path) {
|
|
StringRef p(path.data(), path.size());
|
|
|
|
bool rootName = path::has_root_name(p),
|
|
rootDirectory = path::has_root_directory(p);
|
|
|
|
// Already absolute.
|
|
if (rootName && rootDirectory)
|
|
return success;
|
|
|
|
// All of the following conditions will need the current directory.
|
|
SmallString<128> current_dir;
|
|
if (error_code ec = current_path(current_dir)) return ec;
|
|
|
|
// Relative path. Prepend the current directory.
|
|
if (!rootName && !rootDirectory) {
|
|
// Append path to the current directory.
|
|
path::append(current_dir, p);
|
|
// Set path to the result.
|
|
path.swap(current_dir);
|
|
return success;
|
|
}
|
|
|
|
if (!rootName && rootDirectory) {
|
|
StringRef cdrn = path::root_name(current_dir);
|
|
SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
|
|
path::append(curDirRootName, p);
|
|
// Set path to the result.
|
|
path.swap(curDirRootName);
|
|
return success;
|
|
}
|
|
|
|
if (rootName && !rootDirectory) {
|
|
StringRef pRootName = path::root_name(p);
|
|
StringRef bRootDirectory = path::root_directory(current_dir);
|
|
StringRef bRelativePath = path::relative_path(current_dir);
|
|
StringRef pRelativePath = path::relative_path(p);
|
|
|
|
SmallString<128> res;
|
|
path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
|
|
path.swap(res);
|
|
return success;
|
|
}
|
|
|
|
llvm_unreachable("All rootName and rootDirectory combinations should have "
|
|
"occurred above!");
|
|
}
|
|
|
|
error_code create_directories(const Twine &path, bool &existed) {
|
|
SmallString<128> path_storage;
|
|
StringRef p = path.toStringRef(path_storage);
|
|
|
|
StringRef parent = path::parent_path(p);
|
|
bool parent_exists;
|
|
|
|
if (error_code ec = fs::exists(parent, parent_exists)) return ec;
|
|
|
|
if (!parent_exists)
|
|
return create_directories(parent, existed);
|
|
|
|
return create_directory(p, existed);
|
|
}
|
|
|
|
bool exists(file_status status) {
|
|
return status_known(status) && status.type() != file_type::file_not_found;
|
|
}
|
|
|
|
bool status_known(file_status s) {
|
|
return s.type() != file_type::status_error;
|
|
}
|
|
|
|
bool is_directory(file_status status) {
|
|
return status.type() == file_type::directory_file;
|
|
}
|
|
|
|
error_code is_directory(const Twine &path, bool &result) {
|
|
file_status st;
|
|
if (error_code ec = status(path, st))
|
|
return ec;
|
|
result = is_directory(st);
|
|
return success;
|
|
}
|
|
|
|
bool is_regular_file(file_status status) {
|
|
return status.type() == file_type::regular_file;
|
|
}
|
|
|
|
error_code is_regular_file(const Twine &path, bool &result) {
|
|
file_status st;
|
|
if (error_code ec = status(path, st))
|
|
return ec;
|
|
result = is_regular_file(st);
|
|
return success;
|
|
}
|
|
|
|
bool is_symlink(file_status status) {
|
|
return status.type() == file_type::symlink_file;
|
|
}
|
|
|
|
error_code is_symlink(const Twine &path, bool &result) {
|
|
file_status st;
|
|
if (error_code ec = status(path, st))
|
|
return ec;
|
|
result = is_symlink(st);
|
|
return success;
|
|
}
|
|
|
|
bool is_other(file_status status) {
|
|
return exists(status) &&
|
|
!is_regular_file(status) &&
|
|
!is_directory(status) &&
|
|
!is_symlink(status);
|
|
}
|
|
|
|
void directory_entry::replace_filename(const Twine &filename, file_status st,
|
|
file_status symlink_st) {
|
|
SmallString<128> path(Path.begin(), Path.end());
|
|
path::remove_filename(path);
|
|
path::append(path, filename);
|
|
Path = path.str();
|
|
Status = st;
|
|
SymlinkStatus = symlink_st;
|
|
}
|
|
|
|
error_code has_magic(const Twine &path, const Twine &magic, bool &result) {
|
|
SmallString<32> MagicStorage;
|
|
StringRef Magic = magic.toStringRef(MagicStorage);
|
|
SmallString<32> Buffer;
|
|
|
|
if (error_code ec = get_magic(path, Magic.size(), Buffer)) {
|
|
if (ec == errc::value_too_large) {
|
|
// Magic.size() > file_size(Path).
|
|
result = false;
|
|
return success;
|
|
}
|
|
return ec;
|
|
}
|
|
|
|
result = Magic == Buffer;
|
|
return success;
|
|
}
|
|
|
|
error_code identify_magic(const Twine &path, LLVMFileType &result) {
|
|
SmallString<32> Magic;
|
|
error_code ec = get_magic(path, Magic.capacity(), Magic);
|
|
if (ec && ec != errc::value_too_large)
|
|
return ec;
|
|
|
|
result = IdentifyFileType(Magic.data(), Magic.size());
|
|
return success;
|
|
}
|
|
|
|
namespace {
|
|
error_code remove_all_r(StringRef path, file_type ft, uint32_t &count) {
|
|
if (ft == file_type::directory_file) {
|
|
// This code would be a lot better with exceptions ;/.
|
|
error_code ec;
|
|
for (directory_iterator i(path, ec), e; i != e; i.increment(ec)) {
|
|
if (ec) return ec;
|
|
file_status st;
|
|
if (error_code ec = i->status(st)) return ec;
|
|
if (error_code ec = remove_all_r(i->path(), st.type(), count)) return ec;
|
|
}
|
|
bool obviously_this_exists;
|
|
if (error_code ec = remove(path, obviously_this_exists)) return ec;
|
|
assert(obviously_this_exists);
|
|
++count; // Include the directory itself in the items removed.
|
|
} else {
|
|
bool obviously_this_exists;
|
|
if (error_code ec = remove(path, obviously_this_exists)) return ec;
|
|
assert(obviously_this_exists);
|
|
++count;
|
|
}
|
|
|
|
return success;
|
|
}
|
|
} // end unnamed namespace
|
|
|
|
error_code remove_all(const Twine &path, uint32_t &num_removed) {
|
|
SmallString<128> path_storage;
|
|
StringRef p = path.toStringRef(path_storage);
|
|
|
|
file_status fs;
|
|
if (error_code ec = status(path, fs))
|
|
return ec;
|
|
num_removed = 0;
|
|
return remove_all_r(p, fs.type(), num_removed);
|
|
}
|
|
|
|
error_code directory_entry::status(file_status &result) const {
|
|
return fs::status(Path, result);
|
|
}
|
|
|
|
} // end namespace fs
|
|
} // end namespace sys
|
|
} // end namespace llvm
|
|
|
|
// Include the truly platform-specific parts.
|
|
#if defined(LLVM_ON_UNIX)
|
|
#include "Unix/PathV2.inc"
|
|
#endif
|
|
#if defined(LLVM_ON_WIN32)
|
|
#include "Windows/PathV2.inc"
|
|
#endif
|