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template simplifier: remove explicit instantiations after instantiation (#1523) 

* template simplifier: remove explicit instantiations after instantiation

* Fix use after free crash in clang test suite.
This commit is contained in:
IOBYTE 2018-12-16 23:58:48 -05:00 committed by Daniel Marjamäki
parent 357e2fbfb3
commit 2090866cd0
4 changed files with 147 additions and 107 deletions
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224
lib/templatesimplifier.cpp
View File

@ -368,6 +368,12 @@ void TemplateSimplifier::eraseTokens(Token *begin, const Token *end)
mTypesUsedInTemplateInstantiation[i] = nullptr;
}
}
for (size_t i = 0; i < mExplicitInstantiationsToDelete.size(); ++i) {
if (mExplicitInstantiationsToDelete[i] == begin->next()) {
mExplicitInstantiationsToDelete[i]->hasTemplateSimplifierPointer(false);
mExplicitInstantiationsToDelete[i] = nullptr;
}
}
}
begin->deleteNext();
}
@ -1023,109 +1029,112 @@ void TemplateSimplifier::expandTemplate(
templateDeclaration.token->insertToken(newName, "", true);
templateDeclaration.token->insertToken(";", "", true);
} else if (copy && isFunction) {
// check if this is an explicit instantiation
Token * temp = templateInstantiation.token;
while (temp && !Token::Match(temp->previous(), "}|;|extern"))
temp = temp->previous();
if (Token::Match(temp, "template !!<")) {
// just delete "template"
deleteToken(temp);
Token * dst = templateDeclaration.token;
Token * start;
Token * end;
auto it = mTemplateForwardDeclarationsMap.find(dst);
if (it != mTemplateForwardDeclarationsMap.end()) {
dst = it->second;
const Token * temp1 = dst->tokAt(1)->findClosingBracket();
const Token * temp2 = temp1->tokAt(getTemplateNamePosition(temp1));
start = temp1->next();
end = temp2->linkAt(1)->next();
} else {
// add forward declaration
Token * dst = templateDeclaration.token;
Token * start;
Token * end;
auto it = mTemplateForwardDeclarationsMap.find(dst);
if (it != mTemplateForwardDeclarationsMap.end()) {
dst = it->second;
const Token * temp1 = dst->tokAt(1)->findClosingBracket();
const Token * temp2 = temp1->tokAt(getTemplateNamePosition(temp1));
start = temp1->next();
end = temp2->linkAt(1)->next();
start = templateDeclarationToken->next();
end = templateDeclarationNameToken->linkAt(1)->next();
}
unsigned int typeindentlevel = 0;
while (!(typeindentlevel == 0 && Token::Match(end, ";|{|:"))) {
if (Token::Match(end, "<|(|{"))
++typeindentlevel;
else if (Token::Match(end, ">|)|}"))
--typeindentlevel;
end = end->next();
}
std::map<const Token *, Token *> links;
while (start && start != end) {
unsigned int itype = 0;
while (itype < typeParametersInDeclaration.size() && typeParametersInDeclaration[itype]->str() != start->str())
++itype;
if (itype < typeParametersInDeclaration.size()) {
typeindentlevel = 0;
for (const Token *typetok = mTypesUsedInTemplateInstantiation[itype];
typetok && (typeindentlevel > 0 || !Token::Match(typetok, ",|>"));
typetok = typetok->next()) {
if (Token::simpleMatch(typetok, ". . .")) {
typetok = typetok->tokAt(2);
continue;
}
if (Token::Match(typetok, "%name% <") && templateParameters(typetok->next()) > 0)
++typeindentlevel;
else if (typeindentlevel > 0 && typetok->str() == ">")
--typeindentlevel;
dst->insertToken(typetok->str(), typetok->originalName(), true);
dst->previous()->isTemplateArg(true);
dst->previous()->isSigned(typetok->isSigned());
dst->previous()->isUnsigned(typetok->isUnsigned());
dst->previous()->isLong(typetok->isLong());
}
} else {
start = templateDeclarationToken->next();
end = templateDeclarationNameToken->linkAt(1)->next();
}
unsigned int typeindentlevel = 0;
while (!(typeindentlevel == 0 && Token::Match(end, ";|{|:"))) {
if (Token::Match(end, "<|(|{"))
++typeindentlevel;
else if (Token::Match(end, ">|)|}"))
--typeindentlevel;
end = end->next();
}
std::map<const Token *, Token *> links;
while (start && start != end) {
unsigned int itype = 0;
while (itype < typeParametersInDeclaration.size() && typeParametersInDeclaration[itype]->str() != start->str())
++itype;
if (itype < typeParametersInDeclaration.size()) {
typeindentlevel = 0;
for (const Token *typetok = mTypesUsedInTemplateInstantiation[itype];
typetok && (typeindentlevel > 0 || !Token::Match(typetok, ",|>"));
typetok = typetok->next()) {
if (Token::simpleMatch(typetok, ". . .")) {
typetok = typetok->tokAt(2);
continue;
}
if (Token::Match(typetok, "%name% <") && templateParameters(typetok->next()) > 0)
++typeindentlevel;
else if (typeindentlevel > 0 && typetok->str() == ">")
--typeindentlevel;
dst->insertToken(typetok->str(), typetok->originalName(), true);
dst->previous()->isTemplateArg(true);
dst->previous()->isSigned(typetok->isSigned());
dst->previous()->isUnsigned(typetok->isUnsigned());
dst->previous()->isLong(typetok->isLong());
}
if (start->str() == templateDeclarationNameToken->str()) {
dst->insertToken(newName, "", true);
if (start->strAt(1) == "<")
start = start->next()->findClosingBracket();
} else {
if (start->str() == templateDeclarationNameToken->str()) {
dst->insertToken(newName, "", true);
if (start->strAt(1) == "<")
start = start->next()->findClosingBracket();
} else {
// check if type is a template
if (start->strAt(1) == "<") {
// get the instantiated name
Token * closing = start->next()->findClosingBracket();
std::string name;
const Token * type = start;
while (type && type != closing->next()) {
if (!name.empty())
name += " ";
name += type->str();
type = type->next();
}
// check if type is instantiated
for (const auto & inst : mTemplateInstantiations) {
if (Token::simpleMatch(inst.nameToken, name.c_str())) {
// use the instantiated name
dst->insertToken(name, "", true);
start = closing;
break;
}
}
// just copy the token if it wasn't instantiated
if (start != closing)
dst->insertToken(start->str(), "", true);
} else
dst->insertToken(start->str(), "", true);
}
if (start->link()) {
if (Token::Match(start, "[|{|(")) {
links[start->link()] = dst->previous();
} else if (Token::Match(start, "]|}|)")) {
Token::createMutualLinks(links[start], dst->previous());
links.erase(start);
// check if type is a template
if (start->strAt(1) == "<") {
// get the instantiated name
Token * closing = start->next()->findClosingBracket();
std::string name;
const Token * type = start;
while (type && type != closing->next()) {
if (!name.empty())
name += " ";
name += type->str();
type = type->next();
}
// check if type is instantiated
for (const auto & inst : mTemplateInstantiations) {
if (Token::simpleMatch(inst.nameToken, name.c_str())) {
// use the instantiated name
dst->insertToken(name, "", true);
start = closing;
break;
}
}
// just copy the token if it wasn't instantiated
if (start != closing)
dst->insertToken(start->str(), "", true);
} else
dst->insertToken(start->str(), "", true);
}
if (start->link()) {
if (Token::Match(start, "[|{|(")) {
links[start->link()] = dst->previous();
} else if (Token::Match(start, "]|}|)")) {
Token::createMutualLinks(links[start], dst->previous());
links.erase(start);
}
}
start = start->next();
}
dst->insertToken(";", "", true);
start = start->next();
}
dst->insertToken(";", "", true);
}
if (copy && (isClass || isFunction)) {
// check if this is an explicit instantiation
Token * start = templateInstantiation.token;
while (start && !Token::Match(start->previous(), "}|;|extern"))
start = start->previous();
if (Token::Match(start, "template !!<")) {
if (start->strAt(-1) == "extern")
start = start->previous();
start->hasTemplateSimplifierPointer(true);
mExplicitInstantiationsToDelete.push_back(start);
}
}
@ -1781,7 +1790,8 @@ bool TemplateSimplifier::simplifyTemplateInstantiations(
// Contains tokens such as "T"
std::vector<const Token *> typeParametersInDeclaration;
const Token * const tok = getTemplateParametersInDeclaration(templateDeclaration.token->tokAt(2), typeParametersInDeclaration);
getTemplateParametersInDeclaration(templateDeclaration.token->tokAt(2), typeParametersInDeclaration);
const Token * const tok = templateDeclaration.token->next()->findClosingBracket();
// bail out if the end of the file was reached
if (!tok)
@ -2084,12 +2094,12 @@ void TemplateSimplifier::fixForwardDeclaredDefaultArgumentValues()
for (const auto & forwardDecl : mTemplateForwardDeclarations) {
std::vector<const Token *> params1;
getTemplateParametersInDeclaration(forwardDecl.token, params1);
getTemplateParametersInDeclaration(forwardDecl.token->tokAt(2), params1);
for (auto & decl : mTemplateDeclarations) {
std::vector<const Token *> params2;
getTemplateParametersInDeclaration(decl.token, params2);
getTemplateParametersInDeclaration(decl.token->tokAt(2), params2);
// make sure the number of arguments match
if (params1.size() == params2.size()) {
@ -2153,6 +2163,7 @@ void TemplateSimplifier::simplifyTemplates(
mTemplateForwardDeclarationsMap.clear();
mTemplateInstantiations.clear();
mInstantiatedTemplates.clear();
mExplicitInstantiationsToDelete.clear();
}
bool hasTemplates = getTemplateDeclarations();
@ -2244,6 +2255,21 @@ void TemplateSimplifier::simplifyTemplates(
}
mMemberFunctionsToDelete.erase(mMemberFunctionsToDelete.begin());
}
// remove explicit instantiations
for (size_t j = 0; j < mExplicitInstantiationsToDelete.size(); ++j) {
Token * start = mExplicitInstantiationsToDelete[j];
if (start) {
Token * end = start->next();
while (end && end->str() != ";")
end = end->next();
if (start->previous())
start = start->previous();
if (end->next())
end = end->next();
eraseTokens(start, end);
}
}
}
}

1
lib/templatesimplifier.h
View File

@ -269,6 +269,7 @@ private:
std::list<TokenAndName> mTemplateInstantiations;
std::list<TokenAndName> mInstantiatedTemplates;
std::list<TokenAndName> mMemberFunctionsToDelete;
std::vector<Token *> mExplicitInstantiationsToDelete;
std::vector<Token *> mTypesUsedInTemplateInstantiation;
};

27
test/testsimplifytemplate.cpp
View File

@ -123,6 +123,7 @@ private:
TEST_CASE(template83);
TEST_CASE(template84); // #8880
TEST_CASE(template85); // #8902 crash
TEST_CASE(template86); // crash
TEST_CASE(template_specialization_1); // #7868 - template specialization template <typename T> struct S<C<T>> {..};
TEST_CASE(template_specialization_2); // #7868 - template specialization template <typename T> struct S<C<T>> {..};
TEST_CASE(template_enum); // #6299 Syntax error in complex enum declaration (including template)
@ -1020,8 +1021,6 @@ private:
const char expected[] = "class Fred<float> ; "
"class Fred<int> ; "
"template void Fred<float> :: f ( ) ; "
"template void Fred<int> :: g ( ) ; "
"class Fred<float> { void f ( ) ; void g ( ) ; } ; "
"void Fred<float> :: f ( ) { } "
"void Fred<float> :: g ( ) { } "
@ -1419,8 +1418,8 @@ private:
"void keep_range(T& value, const T mini, const T maxi){}\n"
"template void keep_range<float>(float& v, const float l, const float u);\n"
"template void keep_range<int>(int& v, const int l, const int u);";
const char exp[] = "void keep_range<float> ( float & v , const float l , const float u ) ; "
"void keep_range<int> ( int & v , const int l , const int u ) ; "
const char exp[] = "void keep_range<float> ( float & value , const float mini , const float maxi ) ; "
"void keep_range<int> ( int & value , const int mini , const int maxi ) ; "
"void keep_range<float> ( float & value , const float mini , const float maxi ) { } "
"void keep_range<int> ( int & value , const int mini , const int maxi ) { }";
ASSERT_EQUALS(exp, tok(code));
@ -1445,7 +1444,7 @@ private:
const char code[] = "template<typename T>\n"
"T foo(T& value){ return value; }\n"
"template std::vector<std::vector<int>> foo<std::vector<std::vector<int>>>(std::vector<std::vector<int>>& v);";
const char exp[] = "std :: vector < std :: vector < int > > foo<std::vector<std::vector<int>>> ( std :: vector < std :: vector < int > > & v ) ; "
const char exp[] = "std :: vector < std :: vector < int > > foo<std::vector<std::vector<int>>> ( std :: vector < std :: vector < int > > & value ) ; "
"std :: vector < std :: vector < int > > foo<std::vector<std::vector<int>>> ( std :: vector < std :: vector < int > > & value ) { return value ; }";
ASSERT_EQUALS(exp, tok(code));
}
@ -1458,7 +1457,7 @@ private:
"std::vector<std::vector<int>> v;\n"
"v = foo<std::vector<std::vector<int>>>(v);\n";
const char exp[] = "namespace NS { "
"std :: vector < std :: vector < int > > foo<std::vector<std::vector<int>>> ( std :: vector < std :: vector < int > > & v ) ; "
"std :: vector < std :: vector < int > > foo<std::vector<std::vector<int>>> ( std :: vector < std :: vector < int > > & value ) ; "
"} "
"std :: vector < std :: vector < int > > v ; "
"v = foo<std::vector<std::vector<int>>> ( v ) ; "
@ -1637,6 +1636,21 @@ private:
tok(code);
}
void template86() { // crash
const char code[] = "struct S {\n"
" S();\n"
"};\n"
"template <typename T>\n"
"struct U {\n"
" static S<T> u;\n"
"};\n"
"template <typename T>\n"
"S<T> U<T>::u;\n"
"template S<int> U<int>::u;\n"
"S<int> &i = U<int>::u;";
tok(code);
}
void template_specialization_1() { // #7868 - template specialization template <typename T> struct S<C<T>> {..};
const char code[] = "template <typename T> struct C {};\n"
"template <typename T> struct S {a};\n"
@ -2206,7 +2220,6 @@ private:
"template < int type > struct Barney ; "
"struct Barney<1> { } ; "
"class Fred<1> ; "
"template class Fred<1> ; "
"} "
"class NS :: Fred<1> { "
"public: "

2
test/testsymboldatabase.cpp
View File

@ -2391,7 +2391,7 @@ private:
"public:\n"
" int f() { return C< ::D,int>::f(); }\n"
"};");
ASSERT_EQUALS("[test.cpp:1]: (debug) simplifyTemplates: bailing out\n", errout.str());
ASSERT_EQUALS("[test.cpp:6]: (debug) Failed to instantiate template \"C\". The checking continues anyway.\n", errout.str());
}
void symboldatabase8() {