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1 //===--- Quality.cpp ---------------------------------------------*- C++-*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "Quality.h"
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10 #include "AST.h"
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11 #include "FileDistance.h"
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12 #include "SourceCode.h"
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13 #include "URI.h"
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14 #include "index/Symbol.h"
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15 #include "clang/AST/ASTContext.h"
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16 #include "clang/AST/Decl.h"
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17 #include "clang/AST/DeclCXX.h"
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18 #include "clang/AST/DeclTemplate.h"
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19 #include "clang/AST/DeclVisitor.h"
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20 #include "clang/Basic/CharInfo.h"
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21 #include "clang/Basic/SourceManager.h"
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22 #include "clang/Sema/CodeCompleteConsumer.h"
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23 #include "llvm/ADT/ArrayRef.h"
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24 #include "llvm/ADT/SmallString.h"
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25 #include "llvm/ADT/SmallVector.h"
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26 #include "llvm/ADT/StringExtras.h"
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27 #include "llvm/ADT/StringRef.h"
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28 #include "llvm/Support/Casting.h"
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29 #include "llvm/Support/FormatVariadic.h"
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30 #include "llvm/Support/MathExtras.h"
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31 #include "llvm/Support/raw_ostream.h"
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32 #include <algorithm>
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33 #include <cmath>
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34
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35 namespace clang {
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36 namespace clangd {
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37 static bool isReserved(llvm::StringRef Name) {
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38 // FIXME: Should we exclude _Bool and others recognized by the standard?
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39 return Name.size() >= 2 && Name[0] == '_' &&
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40 (isUppercase(Name[1]) || Name[1] == '_');
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41 }
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42
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43 static bool hasDeclInMainFile(const Decl &D) {
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44 auto &SourceMgr = D.getASTContext().getSourceManager();
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45 for (auto *Redecl : D.redecls()) {
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46 if (isInsideMainFile(Redecl->getLocation(), SourceMgr))
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47 return true;
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48 }
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49 return false;
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50 }
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51
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52 static bool hasUsingDeclInMainFile(const CodeCompletionResult &R) {
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53 const auto &Context = R.Declaration->getASTContext();
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54 const auto &SourceMgr = Context.getSourceManager();
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55 if (R.ShadowDecl) {
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56 if (isInsideMainFile(R.ShadowDecl->getLocation(), SourceMgr))
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57 return true;
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58 }
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59 return false;
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60 }
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61
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62 static SymbolQualitySignals::SymbolCategory categorize(const NamedDecl &ND) {
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63 if (const auto *FD = dyn_cast<FunctionDecl>(&ND)) {
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64 if (FD->isOverloadedOperator())
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65 return SymbolQualitySignals::Operator;
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66 }
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67 class Switch
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68 : public ConstDeclVisitor<Switch, SymbolQualitySignals::SymbolCategory> {
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69 public:
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70 #define MAP(DeclType, Category) \
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71 SymbolQualitySignals::SymbolCategory Visit##DeclType(const DeclType *) { \
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72 return SymbolQualitySignals::Category; \
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73 }
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74 MAP(NamespaceDecl, Namespace);
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75 MAP(NamespaceAliasDecl, Namespace);
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76 MAP(TypeDecl, Type);
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77 MAP(TypeAliasTemplateDecl, Type);
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78 MAP(ClassTemplateDecl, Type);
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79 MAP(CXXConstructorDecl, Constructor);
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80 MAP(CXXDestructorDecl, Destructor);
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81 MAP(ValueDecl, Variable);
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82 MAP(VarTemplateDecl, Variable);
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83 MAP(FunctionDecl, Function);
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84 MAP(FunctionTemplateDecl, Function);
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85 MAP(Decl, Unknown);
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86 #undef MAP
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87 };
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88 return Switch().Visit(&ND);
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89 }
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90
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91 static SymbolQualitySignals::SymbolCategory
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92 categorize(const CodeCompletionResult &R) {
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93 if (R.Declaration)
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94 return categorize(*R.Declaration);
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95 if (R.Kind == CodeCompletionResult::RK_Macro)
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96 return SymbolQualitySignals::Macro;
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97 // Everything else is a keyword or a pattern. Patterns are mostly keywords
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98 // too, except a few which we recognize by cursor kind.
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99 switch (R.CursorKind) {
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100 case CXCursor_CXXMethod:
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101 return SymbolQualitySignals::Function;
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102 case CXCursor_ModuleImportDecl:
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103 return SymbolQualitySignals::Namespace;
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104 case CXCursor_MacroDefinition:
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105 return SymbolQualitySignals::Macro;
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106 case CXCursor_TypeRef:
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107 return SymbolQualitySignals::Type;
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108 case CXCursor_MemberRef:
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109 return SymbolQualitySignals::Variable;
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110 case CXCursor_Constructor:
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111 return SymbolQualitySignals::Constructor;
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112 default:
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113 return SymbolQualitySignals::Keyword;
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114 }
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115 }
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116
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117 static SymbolQualitySignals::SymbolCategory
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118 categorize(const index::SymbolInfo &D) {
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119 switch (D.Kind) {
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120 case index::SymbolKind::Namespace:
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121 case index::SymbolKind::NamespaceAlias:
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122 return SymbolQualitySignals::Namespace;
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123 case index::SymbolKind::Macro:
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124 return SymbolQualitySignals::Macro;
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125 case index::SymbolKind::Enum:
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126 case index::SymbolKind::Struct:
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127 case index::SymbolKind::Class:
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128 case index::SymbolKind::Protocol:
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129 case index::SymbolKind::Extension:
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130 case index::SymbolKind::Union:
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131 case index::SymbolKind::TypeAlias:
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132 return SymbolQualitySignals::Type;
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133 case index::SymbolKind::Function:
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134 case index::SymbolKind::ClassMethod:
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135 case index::SymbolKind::InstanceMethod:
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136 case index::SymbolKind::StaticMethod:
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137 case index::SymbolKind::InstanceProperty:
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138 case index::SymbolKind::ClassProperty:
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139 case index::SymbolKind::StaticProperty:
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140 case index::SymbolKind::ConversionFunction:
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141 return SymbolQualitySignals::Function;
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142 case index::SymbolKind::Destructor:
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143 return SymbolQualitySignals::Destructor;
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144 case index::SymbolKind::Constructor:
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145 return SymbolQualitySignals::Constructor;
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146 case index::SymbolKind::Variable:
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147 case index::SymbolKind::Field:
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148 case index::SymbolKind::EnumConstant:
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149 case index::SymbolKind::Parameter:
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150 return SymbolQualitySignals::Variable;
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151 case index::SymbolKind::Using:
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152 case index::SymbolKind::Module:
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153 case index::SymbolKind::Unknown:
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154 return SymbolQualitySignals::Unknown;
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155 }
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156 llvm_unreachable("Unknown index::SymbolKind");
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157 }
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158
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159 static bool isInstanceMember(const NamedDecl *ND) {
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160 if (!ND)
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161 return false;
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162 if (const auto *TP = dyn_cast<FunctionTemplateDecl>(ND))
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163 ND = TP->TemplateDecl::getTemplatedDecl();
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164 if (const auto *CM = dyn_cast<CXXMethodDecl>(ND))
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165 return !CM->isStatic();
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166 return isa<FieldDecl>(ND); // Note that static fields are VarDecl.
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167 }
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168
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169 static bool isInstanceMember(const index::SymbolInfo &D) {
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170 switch (D.Kind) {
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171 case index::SymbolKind::InstanceMethod:
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172 case index::SymbolKind::InstanceProperty:
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173 case index::SymbolKind::Field:
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174 return true;
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175 default:
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176 return false;
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177 }
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178 }
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179
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180 void SymbolQualitySignals::merge(const CodeCompletionResult &SemaCCResult) {
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181 Deprecated |= (SemaCCResult.Availability == CXAvailability_Deprecated);
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182 Category = categorize(SemaCCResult);
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183
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184 if (SemaCCResult.Declaration) {
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185 ImplementationDetail |= isImplementationDetail(SemaCCResult.Declaration);
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186 if (auto *ID = SemaCCResult.Declaration->getIdentifier())
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187 ReservedName = ReservedName || isReserved(ID->getName());
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188 } else if (SemaCCResult.Kind == CodeCompletionResult::RK_Macro)
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189 ReservedName = ReservedName || isReserved(SemaCCResult.Macro->getName());
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190 }
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191
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192 void SymbolQualitySignals::merge(const Symbol &IndexResult) {
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193 Deprecated |= (IndexResult.Flags & Symbol::Deprecated);
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194 ImplementationDetail |= (IndexResult.Flags & Symbol::ImplementationDetail);
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195 References = std::max(IndexResult.References, References);
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196 Category = categorize(IndexResult.SymInfo);
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197 ReservedName = ReservedName || isReserved(IndexResult.Name);
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198 }
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199
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200 float SymbolQualitySignals::evaluate() const {
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201 float Score = 1;
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202
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203 // This avoids a sharp gradient for tail symbols, and also neatly avoids the
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204 // question of whether 0 references means a bad symbol or missing data.
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205 if (References >= 10) {
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206 // Use a sigmoid style boosting function, which flats out nicely for large
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207 // numbers (e.g. 2.58 for 1M refererences).
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208 // The following boosting function is equivalent to:
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209 // m = 0.06
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210 // f = 12.0
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211 // boost = f * sigmoid(m * std::log(References)) - 0.5 * f + 0.59
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212 // Sample data points: (10, 1.00), (100, 1.41), (1000, 1.82),
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213 // (10K, 2.21), (100K, 2.58), (1M, 2.94)
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214 float S = std::pow(References, -0.06);
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215 Score *= 6.0 * (1 - S) / (1 + S) + 0.59;
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216 }
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217
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218 if (Deprecated)
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219 Score *= 0.1f;
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220 if (ReservedName)
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221 Score *= 0.1f;
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222 if (ImplementationDetail)
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223 Score *= 0.2f;
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224
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225 switch (Category) {
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226 case Keyword: // Often relevant, but misses most signals.
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227 Score *= 4; // FIXME: important keywords should have specific boosts.
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228 break;
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229 case Type:
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230 case Function:
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231 case Variable:
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232 Score *= 1.1f;
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233 break;
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234 case Namespace:
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235 Score *= 0.8f;
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236 break;
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237 case Macro:
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238 case Destructor:
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239 case Operator:
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240 Score *= 0.5f;
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241 break;
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242 case Constructor: // No boost constructors so they are after class types.
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243 case Unknown:
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244 break;
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245 }
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246
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247 return Score;
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248 }
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249
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250 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
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251 const SymbolQualitySignals &S) {
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252 OS << llvm::formatv("=== Symbol quality: {0}\n", S.evaluate());
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253 OS << llvm::formatv("\tReferences: {0}\n", S.References);
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254 OS << llvm::formatv("\tDeprecated: {0}\n", S.Deprecated);
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255 OS << llvm::formatv("\tReserved name: {0}\n", S.ReservedName);
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256 OS << llvm::formatv("\tCategory: {0}\n", static_cast<int>(S.Category));
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257 return OS;
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258 }
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259
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260 static SymbolRelevanceSignals::AccessibleScope
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261 computeScope(const NamedDecl *D) {
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262 // Injected "Foo" within the class "Foo" has file scope, not class scope.
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263 const DeclContext *DC = D->getDeclContext();
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264 if (auto *R = dyn_cast_or_null<RecordDecl>(D))
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265 if (R->isInjectedClassName())
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266 DC = DC->getParent();
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267 // Class constructor should have the same scope as the class.
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268 if (isa<CXXConstructorDecl>(D))
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269 DC = DC->getParent();
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270 bool InClass = false;
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271 for (; !DC->isFileContext(); DC = DC->getParent()) {
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272 if (DC->isFunctionOrMethod())
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273 return SymbolRelevanceSignals::FunctionScope;
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274 InClass = InClass || DC->isRecord();
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275 }
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276 if (InClass)
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277 return SymbolRelevanceSignals::ClassScope;
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278 // ExternalLinkage threshold could be tweaked, e.g. module-visible as global.
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279 // Avoid caching linkage if it may change after enclosing code completion.
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280 if (hasUnstableLinkage(D) || D->getLinkageInternal() < ExternalLinkage)
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281 return SymbolRelevanceSignals::FileScope;
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282 return SymbolRelevanceSignals::GlobalScope;
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283 }
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284
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285 void SymbolRelevanceSignals::merge(const Symbol &IndexResult) {
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286 SymbolURI = IndexResult.CanonicalDeclaration.FileURI;
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287 SymbolScope = IndexResult.Scope;
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288 IsInstanceMember |= isInstanceMember(IndexResult.SymInfo);
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289 if (!(IndexResult.Flags & Symbol::VisibleOutsideFile)) {
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290 Scope = AccessibleScope::FileScope;
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291 }
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292 }
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293
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294 void SymbolRelevanceSignals::merge(const CodeCompletionResult &SemaCCResult) {
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295 if (SemaCCResult.Availability == CXAvailability_NotAvailable ||
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296 SemaCCResult.Availability == CXAvailability_NotAccessible)
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297 Forbidden = true;
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298
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299 if (SemaCCResult.Declaration) {
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300 SemaSaysInScope = true;
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301 // We boost things that have decls in the main file. We give a fixed score
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302 // for all other declarations in sema as they are already included in the
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303 // translation unit.
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304 float DeclProximity = (hasDeclInMainFile(*SemaCCResult.Declaration) ||
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305 hasUsingDeclInMainFile(SemaCCResult))
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306 ? 1.0
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307 : 0.6;
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308 SemaFileProximityScore = std::max(DeclProximity, SemaFileProximityScore);
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309 IsInstanceMember |= isInstanceMember(SemaCCResult.Declaration);
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310 InBaseClass |= SemaCCResult.InBaseClass;
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311 }
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312
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313 // Declarations are scoped, others (like macros) are assumed global.
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314 if (SemaCCResult.Declaration)
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315 Scope = std::min(Scope, computeScope(SemaCCResult.Declaration));
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316
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317 NeedsFixIts = !SemaCCResult.FixIts.empty();
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318 }
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319
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320 static std::pair<float, unsigned> uriProximity(llvm::StringRef SymbolURI,
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321 URIDistance *D) {
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322 if (!D || SymbolURI.empty())
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323 return {0.f, 0u};
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324 unsigned Distance = D->distance(SymbolURI);
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325 // Assume approximately default options are used for sensible scoring.
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326 return {std::exp(Distance * -0.4f / FileDistanceOptions().UpCost), Distance};
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327 }
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328
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329 static float scopeBoost(ScopeDistance &Distance,
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330 llvm::Optional<llvm::StringRef> SymbolScope) {
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331 if (!SymbolScope)
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332 return 1;
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333 auto D = Distance.distance(*SymbolScope);
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334 if (D == FileDistance::Unreachable)
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335 return 0.6f;
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336 return std::max(0.65, 2.0 * std::pow(0.6, D / 2.0));
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337 }
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338
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339 static llvm::Optional<llvm::StringRef>
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340 wordMatching(llvm::StringRef Name, const llvm::StringSet<> *ContextWords) {
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341 if (ContextWords)
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342 for (const auto& Word : ContextWords->keys())
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343 if (Name.contains_lower(Word))
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344 return Word;
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345 return llvm::None;
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346 }
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347
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348 float SymbolRelevanceSignals::evaluate() const {
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349 float Score = 1;
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350
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351 if (Forbidden)
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352 return 0;
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353
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354 Score *= NameMatch;
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355
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356 // File proximity scores are [0,1] and we translate them into a multiplier in
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357 // the range from 1 to 3.
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358 Score *= 1 + 2 * std::max(uriProximity(SymbolURI, FileProximityMatch).first,
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359 SemaFileProximityScore);
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360
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361 if (ScopeProximityMatch)
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362 // Use a constant scope boost for sema results, as scopes of sema results
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363 // can be tricky (e.g. class/function scope). Set to the max boost as we
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364 // don't load top-level symbols from the preamble and sema results are
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365 // always in the accessible scope.
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366 Score *=
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367 SemaSaysInScope ? 2.0 : scopeBoost(*ScopeProximityMatch, SymbolScope);
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368
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369 if (wordMatching(Name, ContextWords))
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370 Score *= 1.5;
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371
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372 // Symbols like local variables may only be referenced within their scope.
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373 // Conversely if we're in that scope, it's likely we'll reference them.
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374 if (Query == CodeComplete) {
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375 // The narrower the scope where a symbol is visible, the more likely it is
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376 // to be relevant when it is available.
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377 switch (Scope) {
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378 case GlobalScope:
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379 break;
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380 case FileScope:
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381 Score *= 1.5f;
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382 break;
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383 case ClassScope:
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384 Score *= 2;
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385 break;
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386 case FunctionScope:
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387 Score *= 4;
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388 break;
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389 }
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390 } else {
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391 // For non-completion queries, the wider the scope where a symbol is
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392 // visible, the more likely it is to be relevant.
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393 switch (Scope) {
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394 case GlobalScope:
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395 break;
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396 case FileScope:
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397 Score *= 0.5f;
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398 break;
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399 default:
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400 // TODO: Handle other scopes as we start to use them for index results.
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401 break;
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402 }
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403 }
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404
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405 if (TypeMatchesPreferred)
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406 Score *= 5.0;
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407
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408 // Penalize non-instance members when they are accessed via a class instance.
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409 if (!IsInstanceMember &&
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410 (Context == CodeCompletionContext::CCC_DotMemberAccess ||
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411 Context == CodeCompletionContext::CCC_ArrowMemberAccess)) {
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412 Score *= 0.2f;
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413 }
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414
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415 if (InBaseClass)
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416 Score *= 0.5f;
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417
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418 // Penalize for FixIts.
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419 if (NeedsFixIts)
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420 Score *= 0.5f;
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421
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422 return Score;
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423 }
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424
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425 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
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426 const SymbolRelevanceSignals &S) {
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427 OS << llvm::formatv("=== Symbol relevance: {0}\n", S.evaluate());
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428 OS << llvm::formatv("\tName: {0}\n", S.Name);
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429 OS << llvm::formatv("\tName match: {0}\n", S.NameMatch);
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430 if (S.ContextWords)
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431 OS << llvm::formatv(
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432 "\tMatching context word: {0}\n",
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433 wordMatching(S.Name, S.ContextWords).getValueOr("<none>"));
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434 OS << llvm::formatv("\tForbidden: {0}\n", S.Forbidden);
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435 OS << llvm::formatv("\tNeedsFixIts: {0}\n", S.NeedsFixIts);
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436 OS << llvm::formatv("\tIsInstanceMember: {0}\n", S.IsInstanceMember);
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437 OS << llvm::formatv("\tContext: {0}\n", getCompletionKindString(S.Context));
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438 OS << llvm::formatv("\tQuery type: {0}\n", static_cast<int>(S.Query));
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439 OS << llvm::formatv("\tScope: {0}\n", static_cast<int>(S.Scope));
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440
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441 OS << llvm::formatv("\tSymbol URI: {0}\n", S.SymbolURI);
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442 OS << llvm::formatv("\tSymbol scope: {0}\n",
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443 S.SymbolScope ? *S.SymbolScope : "<None>");
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444
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445 if (S.FileProximityMatch) {
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446 auto Score = uriProximity(S.SymbolURI, S.FileProximityMatch);
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|
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447 OS << llvm::formatv("\tIndex URI proximity: {0} (distance={1})\n",
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|
|
448 Score.first, Score.second);
|
|
|
449 }
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|
|
450 OS << llvm::formatv("\tSema file proximity: {0}\n", S.SemaFileProximityScore);
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|
|
451
|
|
|
452 OS << llvm::formatv("\tSema says in scope: {0}\n", S.SemaSaysInScope);
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|
|
453 if (S.ScopeProximityMatch)
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|
|
454 OS << llvm::formatv("\tIndex scope boost: {0}\n",
|
|
|
455 scopeBoost(*S.ScopeProximityMatch, S.SymbolScope));
|
|
|
456
|
|
|
457 OS << llvm::formatv(
|
|
|
458 "\tType matched preferred: {0} (Context type: {1}, Symbol type: {2}\n",
|
|
|
459 S.TypeMatchesPreferred, S.HadContextType, S.HadSymbolType);
|
|
|
460
|
|
|
461 return OS;
|
|
|
462 }
|
|
|
463
|
|
|
464 float evaluateSymbolAndRelevance(float SymbolQuality, float SymbolRelevance) {
|
|
|
465 return SymbolQuality * SymbolRelevance;
|
|
|
466 }
|
|
|
467
|
|
|
468 // Produces an integer that sorts in the same order as F.
|
|
|
469 // That is: a < b <==> encodeFloat(a) < encodeFloat(b).
|
|
|
470 static uint32_t encodeFloat(float F) {
|
|
|
471 static_assert(std::numeric_limits<float>::is_iec559, "");
|
|
|
472 constexpr uint32_t TopBit = ~(~uint32_t{0} >> 1);
|
|
|
473
|
|
|
474 // Get the bits of the float. Endianness is the same as for integers.
|
|
|
475 uint32_t U = llvm::FloatToBits(F);
|
|
|
476 // IEEE 754 floats compare like sign-magnitude integers.
|
|
|
477 if (U & TopBit) // Negative float.
|
|
|
478 return 0 - U; // Map onto the low half of integers, order reversed.
|
|
|
479 return U + TopBit; // Positive floats map onto the high half of integers.
|
|
|
480 }
|
|
|
481
|
|
|
482 std::string sortText(float Score, llvm::StringRef Name) {
|
|
|
483 // We convert -Score to an integer, and hex-encode for readability.
|
|
|
484 // Example: [0.5, "foo"] -> "41000000foo"
|
|
|
485 std::string S;
|
|
|
486 llvm::raw_string_ostream OS(S);
|
|
|
487 llvm::write_hex(OS, encodeFloat(-Score), llvm::HexPrintStyle::Lower,
|
|
|
488 /*Width=*/2 * sizeof(Score));
|
|
|
489 OS << Name;
|
|
|
490 OS.flush();
|
|
|
491 return S;
|
|
|
492 }
|
|
|
493
|
|
|
494 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
|
|
|
495 const SignatureQualitySignals &S) {
|
|
|
496 OS << llvm::formatv("=== Signature Quality:\n");
|
|
|
497 OS << llvm::formatv("\tNumber of parameters: {0}\n", S.NumberOfParameters);
|
|
|
498 OS << llvm::formatv("\tNumber of optional parameters: {0}\n",
|
|
|
499 S.NumberOfOptionalParameters);
|
|
|
500 OS << llvm::formatv("\tKind: {0}\n", S.Kind);
|
|
|
501 return OS;
|
|
|
502 }
|
|
|
503
|
|
|
504 } // namespace clangd
|
|
|
505 } // namespace clang
|
