4cf99cfdc7
A new Clang-based tool which converts for loops to use the range-based syntax new to C++11. Three kinds of loops can be converted: - Loops over statically allocated arrays - Loops over containers, using iterators - Loops over array-like containers, using operator[] and at() Each transformation is assigned a confidence level by the tool. The minimum require confidence level to actually apply the transformation can be specified on the command line, but the default level should be fine for most code. Like other tools based on RefactoringTool, it is easiest to use this tool with a compilation database. llvm-svn: 162627
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
//===-- loop-convert/VariableNaming.h - Gererate variable names -*- 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 contains the definitino of the VariableNamer class, which is
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// responsible for generating new variable names and ensuring that they do not
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// conflict with existing ones.
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//
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//===----------------------------------------------------------------------===//
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#include "VariableNaming.h"
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namespace clang {
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namespace loop_migrate {
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std::string VariableNamer::createIndexName() {
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// FIXME: Add in naming conventions to handle:
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// - Uppercase/lowercase indices
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// - How to handle conflicts
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// - An interactive process for naming
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std::string IteratorName;
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std::string ContainerName;
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if (TheContainer)
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ContainerName = TheContainer->getName().str();
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size_t Len = ContainerName.length();
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if (Len > 1 && ContainerName[Len - 1] == 's')
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IteratorName = ContainerName.substr(0, Len - 1);
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else
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IteratorName = "elem";
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if (!declarationExists(IteratorName))
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return IteratorName;
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IteratorName = ContainerName + "_" + OldIndex->getName().str();
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if (!declarationExists(IteratorName))
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return IteratorName;
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IteratorName = ContainerName + "_elem";
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if (!declarationExists(IteratorName))
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return IteratorName;
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IteratorName += "_elem";
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if (!declarationExists(IteratorName))
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return IteratorName;
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IteratorName = "_elem_";
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// Someone defeated my naming scheme...
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while (declarationExists(IteratorName))
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IteratorName += "i";
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return IteratorName;
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}
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/// \brief Determines whether or not the the name Symbol exists in LoopContext,
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/// any of its parent contexts, or any of its child statements.
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///
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/// We also check to see if the same identifier was generated by this loop
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/// converter in a loop nested within SourceStmt.
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bool VariableNamer::declarationExists(const StringRef Symbol) {
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// Determine if the symbol was generated in a parent context.
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for (const Stmt *S = SourceStmt; S != NULL; S = ReverseAST->lookup(S)) {
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StmtGeneratedVarNameMap::const_iterator I = GeneratedDecls->find(S);
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if (I != GeneratedDecls->end() && I->second == Symbol)
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return true;
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}
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// FIXME: Rather than detecting conflicts at their usages, we should check the
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// parent context.
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// For some reason, lookup() always returns the pair (NULL, NULL) because its
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// StoredDeclsMap is not initialized (i.e. LookupPtr.getInt() is false inside
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// of DeclContext::lookup()). Why is this?
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// Finally, determine if the symbol was used in the loop or a child context.
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DeclFinderASTVisitor DeclFinder(Symbol, GeneratedDecls);
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return DeclFinder.findUsages(SourceStmt);
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}
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} // namespace loop_migrate
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} // namespace clang
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