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Optimization: Improved performance of ForwardAnalyzer by adding some pre-checks and combining conditions

This commit is contained in:
PKEuS 2020-05-18 08:00:01 +02:00
parent c155062cf2
commit 22884888fb
1 changed files with 34 additions and 30 deletions
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64
lib/forwardanalyzer.cpp
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@ -36,7 +36,7 @@ struct ForwardTraversal {
if (out)
*out = tok->link();
return Progress::Skip;
} else if (Token::Match(tok, "?|&&|%oror%") && tok->astOperand1() && tok->astOperand2()) {
} else if (tok->astOperand1() && tok->astOperand2() && Token::Match(tok, "?|&&|%oror%")) {
if (traverseConditional(tok, f, traverseUnknown) == Progress::Break)
return Progress::Break;
if (out)
@ -49,7 +49,7 @@ struct ForwardTraversal {
if (out)
*out = lambdaEndToken;
// Skip class scope
} else if (Token::simpleMatch(tok, "{") && tok->scope() && tok->scope()->isClassOrStruct()) {
} else if (tok->str() == "{" && tok->scope() && tok->scope()->isClassOrStruct()) {
if (out)
*out = tok->link();
} else {
@ -239,15 +239,17 @@ struct ForwardTraversal {
for (Token* tok = start; tok && tok != end; tok = tok->next()) {
Token* next = nullptr;
// Skip casts..
if (tok->str() == "(" && !tok->astOperand2() && tok->isCast()) {
tok = tok->link();
continue;
}
// Skip template arguments..
if (tok->str() == "<" && tok->link()) {
tok = tok->link();
continue;
if (tok->link()) {
// Skip casts..
if (tok->str() == "(" && !tok->astOperand2() && tok->isCast()) {
tok = tok->link();
continue;
}
// Skip template arguments..
if (tok->str() == "<") {
tok = tok->link();
continue;
}
}
// Evaluate RHS of assignment before LHS
@ -261,7 +263,7 @@ struct ForwardTraversal {
tok = nextAfterAstRightmostLeaf(assignTok);
if (!tok)
return Progress::Break;
} else if (Token::simpleMatch(tok, "break")) {
} else if (tok->str() == "break") {
const Scope* scope = findBreakScope(tok->scope());
if (!scope)
return Progress::Break;
@ -271,27 +273,31 @@ struct ForwardTraversal {
// TODO: Don't break, instead move to the outer scope
if (!tok)
return Progress::Break;
} else if (Token::Match(tok, "%name% :") || Token::simpleMatch(tok, "case")) {
} else if (Token::Match(tok, "%name% :") || tok->str() == "case") {
if (!analyzer->lowerToPossible())
return Progress::Break;
} else if (Token::simpleMatch(tok, "}") && Token::Match(tok->link()->previous(), ")|else {")) {
const bool inElse = Token::simpleMatch(tok->link()->previous(), "else {");
const Token* condTok = getCondTokFromEnd(tok);
if (!condTok)
return Progress::Break;
if (!condTok->hasKnownIntValue()) {
} else if (tok->link() && tok->str() == "}") {
if (Token::Match(tok->link()->previous(), ")|else {")) {
const bool inElse = Token::simpleMatch(tok->link()->previous(), "else {");
const Token* condTok = getCondTokFromEnd(tok);
if (!condTok)
return Progress::Break;
if (!condTok->hasKnownIntValue()) {
if (!analyzer->lowerToPossible())
return Progress::Break;
} else if (condTok->values().front().intvalue == !inElse) {
return Progress::Break;
}
analyzer->assume(condTok, !inElse, tok);
if (Token::simpleMatch(tok, "} else {"))
tok = tok->linkAt(2);
} else if (Token::simpleMatch(tok->link()->previous(), "try {")) {
if (!analyzer->lowerToPossible())
return Progress::Break;
} else if (condTok->values().front().intvalue == !inElse) {
return Progress::Break;
}
analyzer->assume(condTok, !inElse, tok);
if (Token::simpleMatch(tok, "} else {"))
} else if (Token::simpleMatch(tok->next(), "else {")) {
tok = tok->linkAt(2);
} else if (Token::simpleMatch(tok, "}") && Token::simpleMatch(tok->link()->previous(), "try {")) {
if (!analyzer->lowerToPossible())
return Progress::Break;
} else if (Token::Match(tok, "if|while|for (") && Token::simpleMatch(tok->next()->link(), ") {")) {
}
} else if (tok->isControlFlowKeyword() && Token::Match(tok, "if|while|for (") && Token::simpleMatch(tok->next()->link(), ") {")) {
Token* endCond = tok->next()->link();
Token* endBlock = endCond->next()->link();
Token* condTok = getCondTok(tok);
@ -373,8 +379,6 @@ struct ForwardTraversal {
analyzer->assume(condTok, elseAction.isModified());
}
}
} else if (Token::simpleMatch(tok, "} else {")) {
tok = tok->linkAt(2);
} else if (Token::simpleMatch(tok, "try {")) {
Token* endBlock = tok->next()->link();
ForwardAnalyzer::Action a = analyzeScope(endBlock);