1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <string>
#include <set>
#include <iostream>
#include <fstream>

#include "clang/AST/Attr.h"

#include "plugin.hxx"
#include "compat.hxx"

/*
  Count call sites that are actually using the defaulted values on params on methods that declare such.

  The process goes something like this:
    $ make check
    $ make FORCE_COMPILE_ALL=1 COMPILER_PLUGIN_TOOL='countusersofdefaultparams' check
    $ ./compilerplugins/clang/countusersofdefaultparams.py
*/

namespace {

struct MyFuncInfo
{
    std::string access;
    std::string returnType;
    std::string nameAndParams;
    std::string sourceLocation;
};
bool operator < (const MyFuncInfo &lhs, const MyFuncInfo &rhs)
{
    return std::tie(lhs.returnType, lhs.nameAndParams)
         < std::tie(rhs.returnType, rhs.nameAndParams);
}
struct MyCallInfo : public MyFuncInfo
{
    std::string sourceLocationOfCall;
};
bool operator < (const MyCallInfo &lhs, const MyCallInfo &rhs)
{
    return std::tie(lhs.returnType, lhs.nameAndParams, lhs.sourceLocationOfCall)
         < std::tie(rhs.returnType, rhs.nameAndParams, rhs.sourceLocationOfCall);
}


// try to limit the voluminous output a little
static std::set<MyCallInfo> callSet;
static std::set<MyFuncInfo> definitionSet;

class CountUsersOfDefaultParams:
    public RecursiveASTVisitor<CountUsersOfDefaultParams>, public loplugin::Plugin
{
public:
    explicit CountUsersOfDefaultParams(loplugin::InstantiationData const & data): Plugin(data) {}

    virtual void run() override
    {
        TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());

        // dump all our output in one write call - this is to try and limit IO "crosstalk" between multiple processes
        // writing to the same logfile

        std::string output;
        for (const MyFuncInfo & s : definitionSet)
            output += "defn:\t" + s.access + "\t" + s.returnType + "\t" + s.nameAndParams + "\t" + s.sourceLocation + "\n";<--- Consider using std::accumulate algorithm instead of a raw loop.
        for (const MyCallInfo & s : callSet)
            output += "call:\t" + s.returnType + "\t" + s.nameAndParams + "\t" + s.sourceLocationOfCall + "\n";<--- Consider using std::accumulate algorithm instead of a raw loop.
        std::ofstream myfile;
        myfile.open( WORKDIR "/loplugin.countusersofdefaultparams.log", std::ios::app | std::ios::out);
        myfile << output;
        myfile.close();
    }

    bool shouldVisitTemplateInstantiations () const { return true; }

    bool VisitCallExpr( const CallExpr * );
    bool VisitFunctionDecl( const FunctionDecl* );
    bool VisitCXXConstructExpr( const CXXConstructExpr * );
private:
    void niceName(const FunctionDecl* functionDecl, MyFuncInfo&);
    std::string locationToString(const SourceLocation&);
};

void CountUsersOfDefaultParams::niceName(const FunctionDecl* functionDecl, MyFuncInfo& aInfo)
{
    if (functionDecl->getInstantiatedFromMemberFunction())
        functionDecl = functionDecl->getInstantiatedFromMemberFunction();
    else if (functionDecl->getClassScopeSpecializationPattern())
        functionDecl = functionDecl->getClassScopeSpecializationPattern();
    else if (functionDecl->getTemplateInstantiationPattern())
        functionDecl = functionDecl->getTemplateInstantiationPattern();

    switch (functionDecl->getAccess())
    {
    case AS_public: aInfo.access = "public"; break;
    case AS_private: aInfo.access = "private"; break;
    case AS_protected: aInfo.access = "protected"; break;
    default: aInfo.access = "unknown"; break;
    }
    aInfo.returnType = functionDecl->getReturnType().getCanonicalType().getAsString();

    if (isa<CXXMethodDecl>(functionDecl)) {
        const CXXRecordDecl* recordDecl = dyn_cast<CXXMethodDecl>(functionDecl)->getParent();
        aInfo.nameAndParams += recordDecl->getQualifiedNameAsString();
        aInfo.nameAndParams += "::";
    }
    aInfo.nameAndParams += functionDecl->getNameAsString() + "(";
    bool bFirst = true;
    for (const ParmVarDecl *pParmVarDecl : compat::parameters(*functionDecl)) {
        if (bFirst)
            bFirst = false;
        else
            aInfo.nameAndParams += ",";
        aInfo.nameAndParams += pParmVarDecl->getType().getCanonicalType().getAsString();
    }
    aInfo.nameAndParams += ")";
    if (isa<CXXMethodDecl>(functionDecl) && dyn_cast<CXXMethodDecl>(functionDecl)->isConst()) {
        aInfo.nameAndParams += " const";
    }

    aInfo.sourceLocation = locationToString(functionDecl->getLocation());
    loplugin::normalizeDotDotInFilePath(aInfo.sourceLocation);
}

bool CountUsersOfDefaultParams::VisitCallExpr(const CallExpr * callExpr) {
    if (ignoreLocation(callExpr)) {
        return true;
    }
    const FunctionDecl* functionDecl;
    if (isa<CXXMemberCallExpr>(callExpr)) {
        functionDecl = dyn_cast<CXXMemberCallExpr>(callExpr)->getMethodDecl();
    }
    else {
        functionDecl = callExpr->getDirectCallee();
    }
    if (functionDecl == nullptr) {
        return true;
    }
    functionDecl = functionDecl->getCanonicalDecl();
    // work our way up to the root method
    while (isa<CXXMethodDecl>(functionDecl)) {
        const CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(functionDecl);
        if (methodDecl->size_overridden_methods()==0)
            break;
        functionDecl = *methodDecl->begin_overridden_methods();
    }
    // work our way back to the root definition for template methods
    if (functionDecl->getInstantiatedFromMemberFunction())
        functionDecl = functionDecl->getInstantiatedFromMemberFunction();
    else if (functionDecl->getClassScopeSpecializationPattern())
        functionDecl = functionDecl->getClassScopeSpecializationPattern();
    else if (functionDecl->getTemplateInstantiationPattern())
        functionDecl = functionDecl->getTemplateInstantiationPattern();
    int n = functionDecl->getNumParams() - 1;
    if (n < 0 || !functionDecl->getParamDecl(n)->hasDefaultArg()) {
        return true;
    }
    while (n > 0 && functionDecl->getParamDecl(n-1)->hasDefaultArg()) {
        --n;
    }
    // look for callsites that are actually using the defaulted values
    if ( n < (int)callExpr->getNumArgs() && callExpr->getArg(n)->isDefaultArgument()) {
        MyCallInfo callInfo;
        niceName(functionDecl, callInfo);
        callInfo.sourceLocationOfCall = locationToString(compat::getBeginLoc(callExpr));
        callSet.insert(callInfo);
    }
    return true;
}

bool CountUsersOfDefaultParams::VisitCXXConstructExpr(const CXXConstructExpr * constructExpr) {
    if (ignoreLocation(constructExpr)) {
        return true;
    }
    const CXXConstructorDecl* constructorDecl = constructExpr->getConstructor()->getCanonicalDecl();
    // work our way back to the root definition for template methods
    if (constructorDecl->getInstantiatedFromMemberFunction())
        constructorDecl = dyn_cast<CXXConstructorDecl>(constructorDecl->getInstantiatedFromMemberFunction());
    else if (constructorDecl->getClassScopeSpecializationPattern())
        constructorDecl = dyn_cast<CXXConstructorDecl>(constructorDecl->getClassScopeSpecializationPattern());
    else if (constructorDecl->getTemplateInstantiationPattern())
        constructorDecl = dyn_cast<CXXConstructorDecl>(constructorDecl->getTemplateInstantiationPattern());
    int n = constructorDecl->getNumParams() - 1;
    if (n < 0 || !constructorDecl->getParamDecl(n)->hasDefaultArg()) {
        return true;
    }
    while (n > 0 && constructorDecl->getParamDecl(n-1)->hasDefaultArg()) {
        --n;
    }
    // look for callsites that are actually using the defaulted values
    if ( n < (int)constructExpr->getNumArgs() && constructExpr->getArg(n)->isDefaultArgument()) {
        MyCallInfo callInfo;
        niceName(constructorDecl, callInfo);
        callInfo.sourceLocationOfCall = locationToString(compat::getBeginLoc(constructExpr));
        callSet.insert(callInfo);
    }
    return true;
}

std::string CountUsersOfDefaultParams::locationToString(const SourceLocation& sourceLoc)
{
    SourceLocation expansionLoc = compiler.getSourceManager().getExpansionLoc( sourceLoc );
    StringRef name = compiler.getSourceManager().getFilename(expansionLoc);
    return std::string(name.substr(strlen(SRCDIR)+1)) + ":" + std::to_string(compiler.getSourceManager().getSpellingLineNumber(expansionLoc));
}

bool CountUsersOfDefaultParams::VisitFunctionDecl( const FunctionDecl* functionDecl )
{
    functionDecl = functionDecl->getCanonicalDecl();
    if( !functionDecl || !functionDecl->getLocation().isValid() || ignoreLocation( functionDecl )) {
        return true;
    }
    const CXXMethodDecl* methodDecl = dyn_cast_or_null<CXXMethodDecl>(functionDecl);

    // ignore method overrides, since the call will show up as being directed to the root method
    if (methodDecl && (methodDecl->size_overridden_methods() != 0 || methodDecl->hasAttr<OverrideAttr>())) {
        return true;
    }
    // ignore stuff that forms part of the stable URE interface
    if (isInUnoIncludeFile(functionDecl)) {
        return true;
    }
    if (isa<CXXDestructorDecl>(functionDecl)) {
        return true;
    }
    if (functionDecl->isDeleted()) {
        return true;
    }
    auto n = functionDecl->getNumParams();
    if (n == 0 || !functionDecl->getParamDecl(n - 1)->hasDefaultArg()) {
        return true;
    }

    if( functionDecl->getLocation().isValid() )
    {
        MyFuncInfo funcInfo;
        niceName(functionDecl, funcInfo);
        definitionSet.insert(funcInfo);
    }
    return true;
}

loplugin::Plugin::Registration< CountUsersOfDefaultParams > X("countusersofdefaultparams", false);

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */