1//===- OptParserEmitter.cpp - Table Driven Command Line Parsing -----------===//
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
9#include "Common/OptEmitter.h"
10#include "llvm/ADT/STLExtras.h"
11#include "llvm/ADT/StringMap.h"
12#include "llvm/TableGen/Record.h"
13#include "llvm/TableGen/TableGenBackend.h"
14
15using namespace llvm;
16
17/// OptParserEmitter - This tablegen backend takes an input .td file
18/// describing a list of options and emits a RST man page.
19static void EmitOptRST(RecordKeeper &Records, raw_ostream &OS) {
20 llvm::StringMap<std::vector<Record *>> OptionsByGroup;
21 std::vector<Record *> OptionsWithoutGroup;
22
23 // Get the options.
24 std::vector<Record *> Opts = Records.getAllDerivedDefinitions(ClassName: "Option");
25 array_pod_sort(Start: Opts.begin(), End: Opts.end(), Compare: CompareOptionRecords);
26
27 // Get the option groups.
28 const std::vector<Record *> &Groups =
29 Records.getAllDerivedDefinitions(ClassName: "OptionGroup");
30 for (unsigned i = 0, e = Groups.size(); i != e; ++i) {
31 const Record &R = *Groups[i];
32 OptionsByGroup.try_emplace(Key: R.getValueAsString(FieldName: "Name"));
33 }
34
35 // Map options to their group.
36 for (unsigned i = 0, e = Opts.size(); i != e; ++i) {
37 const Record &R = *Opts[i];
38 if (const DefInit *DI = dyn_cast<DefInit>(Val: R.getValueInit(FieldName: "Group"))) {
39 OptionsByGroup[DI->getDef()->getValueAsString(FieldName: "Name")].push_back(x: Opts[i]);
40 } else {
41 OptionsByGroup["options"].push_back(x: Opts[i]);
42 }
43 }
44
45 // Print options under their group.
46 for (const auto &KV : OptionsByGroup) {
47 std::string GroupName = KV.getKey().upper();
48 OS << GroupName << '\n';
49 OS << std::string(GroupName.size(), '-') << '\n';
50 OS << '\n';
51
52 for (Record *R : KV.getValue()) {
53 OS << ".. option:: ";
54
55 // Print the prefix.
56 std::vector<StringRef> Prefixes = R->getValueAsListOfStrings(FieldName: "Prefixes");
57 if (!Prefixes.empty())
58 OS << Prefixes[0];
59
60 // Print the option name.
61 OS << R->getValueAsString(FieldName: "Name");
62
63 StringRef MetaVarName;
64 // Print the meta-variable.
65 if (!isa<UnsetInit>(Val: R->getValueInit(FieldName: "MetaVarName"))) {
66 MetaVarName = R->getValueAsString(FieldName: "MetaVarName");
67 } else if (!isa<UnsetInit>(Val: R->getValueInit(FieldName: "Values")))
68 MetaVarName = "<value>";
69
70 if (!MetaVarName.empty()) {
71 OS << '=';
72 OS.write_escaped(Str: MetaVarName);
73 }
74
75 OS << "\n\n";
76
77 std::string HelpText;
78 // The option help text.
79 if (!isa<UnsetInit>(Val: R->getValueInit(FieldName: "HelpText"))) {
80 HelpText = R->getValueAsString(FieldName: "HelpText").trim().str();
81 if (!HelpText.empty() && HelpText.back() != '.')
82 HelpText.push_back(c: '.');
83 }
84
85 if (!isa<UnsetInit>(Val: R->getValueInit(FieldName: "Values"))) {
86 SmallVector<StringRef> Values;
87 SplitString(Source: R->getValueAsString(FieldName: "Values"), OutFragments&: Values, Delimiters: ",");
88 HelpText += (" " + MetaVarName + " must be '").str();
89
90 if (Values.size() > 1) {
91 HelpText += join(Begin: Values.begin(), End: Values.end() - 1, Separator: "', '");
92 HelpText += "' or '";
93 }
94 HelpText += (Values.back() + "'.").str();
95 }
96
97 if (!HelpText.empty()) {
98 OS << ' ';
99 OS.write_escaped(Str: HelpText);
100 OS << "\n\n";
101 }
102 }
103 }
104}
105
106static TableGen::Emitter::Opt X("gen-opt-rst", EmitOptRST,
107 "Generate option RST");
108

source code of llvm/utils/TableGen/OptRSTEmitter.cpp