1//===--- CompileCommands.h - Manipulation of compile flags -------*- C++-*-===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_COMPILECOMMANDS_H
9#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_COMPILECOMMANDS_H
10
11#include "GlobalCompilationDatabase.h"
12#include "support/Threading.h"
13#include "llvm/ADT/StringMap.h"
14#include "llvm/ADT/StringRef.h"
15#include "llvm/Support/CommandLine.h"
16#include <deque>
17#include <optional>
18#include <string>
19#include <vector>
20
21namespace clang {
22namespace clangd {
23
24// CommandMangler transforms compile commands from some external source
25// for use in clangd. This means:
26// - running the frontend only, stripping args regarding output files etc
27// - forcing the use of clangd's builtin headers rather than clang's
28// - resolving argv0 as cc1 expects
29// - injecting -isysroot flags on mac as the system clang does
30struct CommandMangler {
31 // Absolute path to clang.
32 std::optional<std::string> ClangPath;
33 // Directory containing builtin headers.
34 std::optional<std::string> ResourceDir;
35 // Root for searching for standard library (passed to -isysroot).
36 std::optional<std::string> Sysroot;
37 SystemIncludeExtractorFn SystemIncludeExtractor;
38
39 // A command-mangler that doesn't know anything about the system.
40 // This is hermetic for unit-tests, but won't work well in production.
41 static CommandMangler forTests();
42 // Probe the system and build a command-mangler that knows the toolchain.
43 // - try to find clang on $PATH, otherwise fake a path near clangd
44 // - find the resource directory installed near clangd
45 // - on mac, find clang and isysroot by querying the `xcrun` launcher
46 static CommandMangler detect();
47
48 // `Cmd` may describe compilation of a different file, and will be updated
49 // for parsing `TargetFile`.
50 void operator()(tooling::CompileCommand &Cmd,
51 llvm::StringRef TargetFile) const;
52
53private:
54 Memoize<llvm::StringMap<std::string>> ResolvedDrivers;
55 Memoize<llvm::StringMap<std::string>> ResolvedDriversNoFollow;
56};
57
58// Removes args from a command-line in a semantically-aware way.
59//
60// Internally this builds a large (0.5MB) table of clang options on first use.
61// Both strip() and process() are fairly cheap after that.
62//
63// FIXME: this reimplements much of OptTable, it might be nice to expose more.
64// The table-building strategy may not make sense outside clangd.
65class ArgStripper {
66public:
67 ArgStripper() = default;
68 ArgStripper(ArgStripper &&) = default;
69 ArgStripper(const ArgStripper &) = delete;
70 ArgStripper &operator=(ArgStripper &&) = default;
71 ArgStripper &operator=(const ArgStripper &) = delete;
72
73 // Adds the arg to the set which should be removed.
74 //
75 // Recognized clang flags are stripped semantically. When "-I" is stripped:
76 // - so is its value (either as -Ifoo or -I foo)
77 // - aliases like --include-directory=foo are also stripped
78 // - CL-style /Ifoo will be removed if the args indicate MS-compatible mode
79 // Compile args not recognized as flags are removed literally, except:
80 // - strip("ABC*") will remove any arg with an ABC prefix.
81 //
82 // In either case, the -Xclang prefix will be dropped if present.
83 void strip(llvm::StringRef Arg);
84 // Remove the targets from a compile command, in-place.
85 void process(std::vector<std::string> &Args) const;
86
87private:
88 // Deletion rules, to be checked for each arg.
89 struct Rule {
90 llvm::StringRef Text; // Rule applies only if arg begins with Text.
91 unsigned char Modes = 0; // Rule applies only in specified driver modes.
92 uint16_t Priority = 0; // Lower is better.
93 uint16_t ExactArgs = 0; // Num args consumed when Arg == Text.
94 uint16_t PrefixArgs = 0; // Num args consumed when Arg starts with Text.
95 };
96 static llvm::ArrayRef<Rule> rulesFor(llvm::StringRef Arg);
97 const Rule *matchingRule(llvm::StringRef Arg, unsigned Mode,
98 unsigned &ArgCount) const;
99 llvm::SmallVector<Rule> Rules;
100 std::deque<std::string> Storage; // Store strings not found in option table.
101};
102
103// Renders an argv list, with arguments separated by spaces.
104// Where needed, arguments are "quoted" and escaped.
105std::string printArgv(llvm::ArrayRef<llvm::StringRef> Args);
106std::string printArgv(llvm::ArrayRef<std::string> Args);
107
108} // namespace clangd
109} // namespace clang
110
111#endif
112

source code of clang-tools-extra/clangd/CompileCommands.h