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5a992b5fc4
A number of architectures re-use the same register names (e.g. for both 32-bit FPRs and 64-bit FPRs). They are currently unable to use the tablegen'erated MatchRegisterName and MatchRegisterAltName, as tablegen (when built with asserts enabled) will fail. When the AllowDuplicateRegisterNames in AsmParser is set, duplicated register names will be tolerated. A backend can then coerce registers to the desired register class by (for instance) implementing validateTargetOperandClass. At least the in-tree Sparc backend could benefit from this, as does RISC-V (single and double precision floating point registers). Differential Revision: https://reviews.llvm.org/D39845 llvm-svn: 320018
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
//===- StringMatcher.h - Generate a matcher for input strings ---*- 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 StringMatcher class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TABLEGEN_STRINGMATCHER_H
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#define LLVM_TABLEGEN_STRINGMATCHER_H
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#include "llvm/ADT/StringRef.h"
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#include <string>
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#include <utility>
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#include <vector>
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namespace llvm {
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class raw_ostream;
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/// StringMatcher - Given a list of strings and code to execute when they match,
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/// output a simple switch tree to classify the input string.
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///
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/// If a match is found, the code in Vals[i].second is executed; control must
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/// not exit this code fragment. If nothing matches, execution falls through.
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///
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class StringMatcher {
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public:
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using StringPair = std::pair<std::string, std::string>;
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private:
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StringRef StrVariableName;
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const std::vector<StringPair> &Matches;
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raw_ostream &OS;
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public:
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StringMatcher(StringRef strVariableName,
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const std::vector<StringPair> &matches, raw_ostream &os)
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: StrVariableName(strVariableName), Matches(matches), OS(os) {}
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void Emit(unsigned Indent = 0, bool IgnoreDuplicates = false) const;
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private:
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bool EmitStringMatcherForChar(const std::vector<const StringPair *> &Matches,
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unsigned CharNo, unsigned IndentCount,
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bool IgnoreDuplicates) const;
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};
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} // end namespace llvm
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#endif // LLVM_TABLEGEN_STRINGMATCHER_H
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