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/* -*- 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 <cassert>
#include <string>
#include <iostream>
#include <fstream>
#include <set>
#include "plugin.hxx"
#include "compat.hxx"
/**
if a field is
- a pointer
- only assigned to in the constructor via a new expression
- unconditionally deleted in the destructor
then it can probably just be allocated inline in the parent object
TODO check for cases where the pointer is passed by non-const reference
Be warned that it produces around 5G of log file.
The process goes something like this:
$ make check
$ make FORCE_COMPILE_ALL=1 COMPILER_PLUGIN_TOOL='inlinefields' check
$ ./compilerplugins/clang/inlinefields.py
and then
$ for dir in *; do make FORCE_COMPILE_ALL=1 UPDATE_FILES=$dir COMPILER_PLUGIN_TOOL='inlinefieldsremove' $dir; done
to auto-remove the method declarations
Note that the actual process may involve a fair amount of undoing, hand editing, and general messing around
to get it to work :-)
*/
namespace {
struct MyFieldInfo
{
std::string parentClass;
std::string fieldName;
std::string sourceLocation;
};
bool operator < (const MyFieldInfo &lhs, const MyFieldInfo &rhs)
{
return std::tie(lhs.parentClass, lhs.fieldName)
< std::tie(rhs.parentClass, rhs.fieldName);
}
// try to limit the voluminous output a little
static std::set<MyFieldInfo> excludedSet;
static std::set<MyFieldInfo> definitionSet;
static std::set<MyFieldInfo> deletedInDestructorSet;
static std::set<MyFieldInfo> newedInConstructorSet;
class InlineFields:
public RecursiveASTVisitor<InlineFields>, public loplugin::Plugin
{
public:
explicit InlineFields(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 MyFieldInfo & s : definitionSet)
output += "definition:\t" + s.parentClass + "\t" + s.fieldName + "\t" + s.sourceLocation + "\n";
for (const MyFieldInfo & s : excludedSet)
output += "excluded:\t" + s.parentClass + "\t" + s.fieldName + "\n";
for (const MyFieldInfo & s : deletedInDestructorSet)
output += "deletedInDestructor:\t" + s.parentClass + "\t" + s.fieldName + "\n";
for (const MyFieldInfo & s : newedInConstructorSet)
output += "newedInConstructor:\t" + s.parentClass + "\t" + s.fieldName + "\n";
std::ofstream myfile;
myfile.open( WORKDIR "/loplugin.inlinefields.log", std::ios::app | std::ios::out);
myfile << output;
myfile.close();
}
bool shouldVisitTemplateInstantiations () const { return true; }
bool shouldVisitImplicitCode() const { return true; }
bool VisitFieldDecl( const FieldDecl* );
bool VisitCXXConstructorDecl( const CXXConstructorDecl* );
bool VisitCXXDeleteExpr( const CXXDeleteExpr* );
bool VisitBinAssign( const BinaryOperator* );
private:
MyFieldInfo niceName(const FieldDecl*);
void checkTouched(const FieldDecl* fieldDecl, const Expr* memberExpr);
};
MyFieldInfo InlineFields::niceName(const FieldDecl* fieldDecl)
{
MyFieldInfo aInfo;
const RecordDecl* recordDecl = fieldDecl->getParent();
if (const CXXRecordDecl* cxxRecordDecl = dyn_cast<CXXRecordDecl>(recordDecl))
{
if (cxxRecordDecl->getTemplateInstantiationPattern())
cxxRecordDecl = cxxRecordDecl->getTemplateInstantiationPattern();
aInfo.parentClass = cxxRecordDecl->getQualifiedNameAsString();
}
else
aInfo.parentClass = recordDecl->getQualifiedNameAsString();
aInfo.fieldName = fieldDecl->getNameAsString();
SourceLocation expansionLoc = compiler.getSourceManager().getExpansionLoc( fieldDecl->getLocation() );
StringRef name = getFilenameOfLocation(expansionLoc);
aInfo.sourceLocation = std::string(name.substr(strlen(SRCDIR)+1)) + ":" + std::to_string(compiler.getSourceManager().getSpellingLineNumber(expansionLoc));
loplugin::normalizeDotDotInFilePath(aInfo.sourceLocation);
return aInfo;
}
bool InlineFields::VisitFieldDecl( const FieldDecl* fieldDecl )
{
fieldDecl = fieldDecl->getCanonicalDecl();
if (ignoreLocation( fieldDecl )) {
return true;
}
// ignore stuff that forms part of the stable URE interface
if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(fieldDecl->getLocation()))) {
return true;
}
QualType type = fieldDecl->getType();
if (!type->isPointerType())
return true;
definitionSet.insert(niceName(fieldDecl));
return true;
}
bool InlineFields::VisitCXXConstructorDecl( const CXXConstructorDecl* decl )
{
if( ignoreLocation( decl ) )
return true;
if (decl->isCopyOrMoveConstructor())
return true;
for(auto it = decl->init_begin(); it != decl->init_end(); ++it)
{
const CXXCtorInitializer* init = *it;
const FieldDecl* fieldDecl = init->getMember();
if( !fieldDecl || !fieldDecl->getType()->isPointerType() )
continue;
auto e = init->getInit();
if (auto parentListExpr = dyn_cast<ParenListExpr>(e))
e = parentListExpr->getExpr(0);
e = e->IgnoreParenImpCasts();
if( isa<CXXNewExpr>(e) )
newedInConstructorSet.insert(niceName(fieldDecl));
else if( isa<CXXNullPtrLiteralExpr>(e) || isa<GNUNullExpr>(e))
; // ignore
else
excludedSet.insert(niceName(fieldDecl));
}
return true;
}
static bool isSameParent(const CXXMethodDecl* cxxMethodDecl, const FieldDecl* fieldDecl)
{
return cxxMethodDecl->getParent() == dyn_cast<CXXRecordDecl>(fieldDecl->getParent());
}
bool InlineFields::VisitBinAssign(const BinaryOperator * binaryOp)
{
if( ignoreLocation( binaryOp ) )
return true;
auto memberExpr = dyn_cast<MemberExpr>(binaryOp->getLHS());
if (!memberExpr)
return true;
auto fieldDecl = dyn_cast<FieldDecl>(memberExpr->getMemberDecl());
if (!fieldDecl || !fieldDecl->getType()->isPointerType()) {
return true;
}
const FunctionDecl* parentFunction = getParentFunctionDecl(binaryOp);
if (!parentFunction) {
return true;
}
// if the field is being assigned from outside its own constructor or destructor, exclude
auto constructorDecl = dyn_cast<CXXConstructorDecl>(parentFunction);
if (constructorDecl && isSameParent(constructorDecl, fieldDecl)) {
if( isa<CXXNewExpr>(binaryOp->getRHS()) )
newedInConstructorSet.insert(niceName(fieldDecl));
else {
excludedSet.insert(niceName(fieldDecl));
std::cout << "assign in constructor:" << std::endl;
binaryOp->getRHS()->dump();
}
return true;
}
auto destructorDecl = dyn_cast<CXXDestructorDecl>(parentFunction);
if (destructorDecl && isSameParent(destructorDecl, fieldDecl)) {
auto e = binaryOp->getRHS()->IgnoreParenImpCasts();
if( !isa<CXXNullPtrLiteralExpr>(e) && !isa<GNUNullExpr>(e)) {
excludedSet.insert(niceName(fieldDecl));
std::cout << "assign in destructor:" << std::endl;
e->dump();
}
return true;
}
excludedSet.insert(niceName(fieldDecl));
return true;
}
bool InlineFields::VisitCXXDeleteExpr(const CXXDeleteExpr * deleteExpr)
{
if( ignoreLocation( deleteExpr ) )
return true;
auto memberExpr = dyn_cast<MemberExpr>(deleteExpr->getArgument()->IgnoreParenImpCasts());
if (!memberExpr)
return true;
auto fieldDecl = dyn_cast<FieldDecl>(memberExpr->getMemberDecl());
if (!fieldDecl || !fieldDecl->getType()->isPointerType()) {
return true;
}
// TODO for some reason, this part is not working properly, it doesn't find the parent
// function for delete statements properly
const FunctionDecl* parentFunction = getParentFunctionDecl(deleteExpr);
if (!parentFunction) {
return true;
}
auto destructorDecl = dyn_cast<CXXDestructorDecl>(parentFunction);
if (destructorDecl && isSameParent(destructorDecl, fieldDecl)) {
deletedInDestructorSet.insert(niceName(fieldDecl));
return true;
}
excludedSet.insert(niceName(fieldDecl));
return true;
}
loplugin::Plugin::Registration< InlineFields > X("inlinefields", false);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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