1 //===- OptEmitter.cpp - Helper for emitting options -------------*- 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 9 #include "OptEmitter.h" 10 #include "llvm/ADT/Twine.h" 11 #include "llvm/Support/OptionStrCmp.h" 12 #include "llvm/TableGen/Error.h" 13 #include "llvm/TableGen/Record.h" 14 15 // Returns true if A is ordered before B. 16 bool llvm::IsOptionRecordsLess(const Record *A, const Record *B) { 17 if (A == B) 18 return false; 19 20 // Sentinel options precede all others and are only ordered by precedence. 21 const Record *AKind = A->getValueAsDef("Kind"); 22 const Record *BKind = B->getValueAsDef("Kind"); 23 24 bool ASent = AKind->getValueAsBit("Sentinel"); 25 bool BSent = BKind->getValueAsBit("Sentinel"); 26 if (ASent != BSent) 27 return ASent; 28 29 std::vector<StringRef> APrefixes = A->getValueAsListOfStrings("Prefixes"); 30 std::vector<StringRef> BPrefixes = B->getValueAsListOfStrings("Prefixes"); 31 32 // Compare options by name, unless they are sentinels. 33 if (!ASent) { 34 if (int Cmp = StrCmpOptionName(A->getValueAsString("Name"), 35 B->getValueAsString("Name"))) 36 return Cmp < 0; 37 38 if (int Cmp = StrCmpOptionPrefixes(APrefixes, BPrefixes)) 39 return Cmp < 0; 40 } 41 42 // Then by the kind precedence; 43 int APrec = AKind->getValueAsInt("Precedence"); 44 int BPrec = BKind->getValueAsInt("Precedence"); 45 if (APrec == BPrec && APrefixes == BPrefixes) { 46 PrintError(A->getLoc(), Twine("Option is equivalent to")); 47 PrintError(B->getLoc(), Twine("Other defined here")); 48 PrintFatalError("Equivalent Options found."); 49 } 50 return APrec < BPrec; 51 } 52