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Revert "Optimize usage of TemplateSimplifier::simplifyCalculations" 

This reverts commit 3044612fe9.

I got a report about a significant slowdown for a code.
This commit is contained in:
Daniel Marjamäki 2018-05-11 21:26:28 +02:00
parent a3f1d28fa5
commit 98e3f373e9
3 changed files with 6 additions and 8 deletions
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7
lib/templatesimplifier.cpp
View File

@ -1241,10 +1241,10 @@ bool TemplateSimplifier::simplifyNumericCalculations(Token *tok)
// TODO: This is not the correct class for simplifyCalculations(), so it
// should be moved away.
bool TemplateSimplifier::simplifyCalculations(Token *start, const Token * const end)
bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
{
bool ret = false, goback = false;
for (Token *tok = start; tok != end; tok = tok->next()) {
for (Token *tok = _tokens; tok; tok = tok->next()) {
if (goback) {
tok = tok->previous();
goback = false;
@ -1527,6 +1527,7 @@ bool TemplateSimplifier::simplifyTemplateInstantiations(
for (std::list<TokenAndName>::const_iterator iter2 = templateInstantiations.begin(); iter2 != templateInstantiations.end(); ++iter2) {
if (numberOfTemplateInstantiations != templateInstantiations.size()) {
numberOfTemplateInstantiations = templateInstantiations.size();
simplifyCalculations(tokenlist.front());
++recursiveCount;
if (recursiveCount > 100) {
// bail out..
@ -1541,8 +1542,6 @@ bool TemplateSimplifier::simplifyTemplateInstantiations(
if (iter2->name != templateDeclaration.name)
continue;
simplifyCalculations(iter2->token->next(), iter2->token->linkAt(1));
if (!matchSpecialization(tok->tokAt(namepos), iter2->token, specializations))
continue;

5
lib/templatesimplifier.h
View File

@ -224,12 +224,11 @@ public:
/**
* Simplify constant calculations such as "1+2" => "3".
* This also performs simple cleanup of parentheses etc.
* @param start start token
* @param end end token
* @param _tokens start token
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
static bool simplifyCalculations(Token *start, const Token *end = nullptr);
static bool simplifyCalculations(Token *_tokens);
private:
/**

2
test/testsimplifytemplate.cpp
View File

@ -1097,7 +1097,7 @@ private:
"struct Factorial<4> { enum FacHelper { value = 4 * Factorial<3> :: value } ; } ; "
"struct Factorial<3> { enum FacHelper { value = 3 * Factorial<2> :: value } ; } ; "
"struct Factorial<2> { enum FacHelper { value = 2 * Factorial<1> :: value } ; } ; "
"struct Factorial<1> { enum FacHelper { value = Factorial<0> :: value } ; } ;";
"struct Factorial<1> { enum FacHelper { value = Factorial < 0 > :: value } ; } ;";
ASSERT_EQUALS(exp, tok(code));
}