[InstCombine] Signed saturation tests. NFC
[llvm-complete.git] / utils / TableGen / GlobalISel / CodeExpander.cpp
blobd59a9b8e3b65eb7f233965fa2a663af02d6f3e94
1 //===- CodeExpander.cpp - Expand variables in a string --------------------===//
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 /// \file Expand the variables in a string.
11 //===----------------------------------------------------------------------===//
13 #include "CodeExpander.h"
14 #include "CodeExpansions.h"
15 #include "llvm/Support/CommandLine.h"
16 #include "llvm/Support/raw_ostream.h"
17 #include "llvm/TableGen/Error.h"
19 using namespace llvm;
21 void CodeExpander::emit(raw_ostream &OS) const {
22 StringRef Current = Code;
24 while (!Current.empty()) {
25 size_t Pos = Current.find_first_of("$\n\\");
26 if (Pos == StringRef::npos) {
27 OS << Current;
28 Current = "";
29 continue;
32 OS << Current.substr(0, Pos);
33 Current = Current.substr(Pos);
35 if (Current.startswith("\n")) {
36 OS << "\n" << Indent;
37 Current = Current.drop_front(1);
38 continue;
41 if (Current.startswith("\\$") || Current.startswith("\\\\")) {
42 OS << Current[1];
43 Current = Current.drop_front(2);
44 continue;
47 if (Current.startswith("\\")) {
48 Current = Current.drop_front(1);
49 continue;
52 if (Current.startswith("${")) {
53 StringRef StartVar = Current;
54 Current = Current.drop_front(2);
55 StringRef Var;
56 std::tie(Var, Current) = Current.split("}");
58 // Warn if we split because no terminator was found.
59 StringRef EndVar = StartVar.drop_front(2 /* ${ */ + Var.size());
60 if (EndVar.empty()) {
61 size_t LocOffset = StartVar.data() - Code.data();
62 PrintWarning(
63 Loc.size() > 0 && Loc[0].isValid()
64 ? SMLoc::getFromPointer(Loc[0].getPointer() + LocOffset)
65 : SMLoc(),
66 "Unterminated expansion");
69 auto ValueI = Expansions.find(Var);
70 if (ValueI == Expansions.end()) {
71 size_t LocOffset = StartVar.data() - Code.data();
72 PrintError(Loc.size() > 0 && Loc[0].isValid()
73 ? SMLoc::getFromPointer(Loc[0].getPointer() + LocOffset)
74 : SMLoc(),
75 "Attempting to expand an undeclared variable " + Var);
77 if (ShowExpansions)
78 OS << "/*$" << Var << "{*/";
79 OS << Expansions.lookup(Var);
80 if (ShowExpansions)
81 OS << "/*}*/";
82 continue;
85 size_t LocOffset = Current.data() - Code.data();
86 PrintWarning(Loc.size() > 0 && Loc[0].isValid()
87 ? SMLoc::getFromPointer(Loc[0].getPointer() + LocOffset)
88 : SMLoc(),
89 "Assuming missing escape character");
90 OS << "$";
91 Current = Current.drop_front(1);