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Remove duplicate uninit warnings (#3478)

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Paul Fultz II 2021-10-04 00:50:23 -05:00 committed by GitHub
parent eb50d19657
commit 2ca2abdf0e
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4 changed files with 67 additions and 71 deletions
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2
Makefile
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@ -515,7 +515,7 @@ $(libcppdir)/errortypes.o: lib/errortypes.cpp lib/config.h lib/errortypes.h
$(libcppdir)/exprengine.o: lib/exprengine.cpp lib/astutils.h lib/bughuntingchecks.h lib/color.h lib/config.h lib/errorlogger.h lib/errortypes.h lib/exprengine.h lib/importproject.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/timer.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/valueflow.h $(libcppdir)/exprengine.o: lib/exprengine.cpp lib/astutils.h lib/bughuntingchecks.h lib/color.h lib/config.h lib/errorlogger.h lib/errortypes.h lib/exprengine.h lib/importproject.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/timer.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/valueflow.h
$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CPPFILESDIR) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(libcppdir)/exprengine.o $(libcppdir)/exprengine.cpp $(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CPPFILESDIR) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(libcppdir)/exprengine.o $(libcppdir)/exprengine.cpp
$(libcppdir)/forwardanalyzer.o: lib/forwardanalyzer.cpp lib/analyzer.h lib/astutils.h lib/check.h lib/checknullpointer.h lib/color.h lib/config.h lib/ctu.h lib/errorlogger.h lib/errortypes.h lib/forwardanalyzer.h lib/importproject.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/timer.h lib/token.h lib/utils.h lib/valueflow.h lib/valueptr.h $(libcppdir)/forwardanalyzer.o: lib/forwardanalyzer.cpp lib/analyzer.h lib/astutils.h lib/config.h lib/errortypes.h lib/forwardanalyzer.h lib/importproject.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/timer.h lib/token.h lib/utils.h lib/valueflow.h lib/valueptr.h
$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CPPFILESDIR) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(libcppdir)/forwardanalyzer.o $(libcppdir)/forwardanalyzer.cpp $(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CPPFILESDIR) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(libcppdir)/forwardanalyzer.o $(libcppdir)/forwardanalyzer.cpp
$(libcppdir)/importproject.o: lib/importproject.cpp externals/picojson/picojson.h externals/tinyxml2/tinyxml2.h lib/astutils.h lib/config.h lib/errortypes.h lib/importproject.h lib/library.h lib/mathlib.h lib/path.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/templatesimplifier.h lib/timer.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/valueflow.h $(libcppdir)/importproject.o: lib/importproject.cpp externals/picojson/picojson.h externals/tinyxml2/tinyxml2.h lib/astutils.h lib/config.h lib/errortypes.h lib/importproject.h lib/library.h lib/mathlib.h lib/path.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/templatesimplifier.h lib/timer.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/valueflow.h

15
lib/checkuninitvar.cpp
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@ -1508,6 +1508,8 @@ void CheckUninitVar::valueFlowUninit()
{ {
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase(); const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
std::unordered_set<nonneg int> ids;
for (bool subfunction : {false, true}) {
// check every executable scope // check every executable scope
for (const Scope* scope : symbolDatabase->functionScopes) { for (const Scope* scope : symbolDatabase->functionScopes) {
for (const Token* tok = scope->bodyStart; tok != scope->bodyEnd; tok = tok->next()) { for (const Token* tok = scope->bodyStart; tok != scope->bodyEnd; tok = tok->next()) {
@ -1515,6 +1517,8 @@ void CheckUninitVar::valueFlowUninit()
tok = tok->linkAt(1); tok = tok->linkAt(1);
continue; continue;
} }
if (ids.count(tok->exprId()) > 0)
continue;
if (!tok->variable() && !tok->isUnaryOp("*")) if (!tok->variable() && !tok->isUnaryOp("*"))
continue; continue;
if (Token::Match(tok, "%name% (")) if (Token::Match(tok, "%name% ("))
@ -1526,9 +1530,14 @@ void CheckUninitVar::valueFlowUninit()
continue; continue;
if (isVoidCast(parent)) if (isVoidCast(parent))
continue; continue;
auto v = std::find_if(tok->values().begin(), tok->values().end(), std::mem_fn(&ValueFlow::Value::isUninitValue)); auto v = std::find_if(
tok->values().begin(), tok->values().end(), std::mem_fn(&ValueFlow::Value::isUninitValue));
if (v == tok->values().end()) if (v == tok->values().end())
continue; continue;
if (v->tokvalue && ids.count(v->tokvalue->exprId()) > 0)
continue;
if (subfunction == (v->path == 0))
continue;
if (v->isInconclusive()) if (v->isInconclusive())
continue; continue;
if (v->indirect > 1 || v->indirect < 0) if (v->indirect > 1 || v->indirect < 0)
@ -1555,6 +1564,9 @@ void CheckUninitVar::valueFlowUninit()
if (isVariableChangedByFunctionCall(tok, v->indirect, mSettings, &inconclusive) || inconclusive) if (isVariableChangedByFunctionCall(tok, v->indirect, mSettings, &inconclusive) || inconclusive)
continue; continue;
uninitvarError(tok, tok->expressionString(), v->errorPath); uninitvarError(tok, tok->expressionString(), v->errorPath);
ids.insert(tok->exprId());
if (v->tokvalue)
ids.insert(v->tokvalue->exprId());
const Token* nextTok = nextAfterAstRightmostLeaf(parent); const Token* nextTok = nextAfterAstRightmostLeaf(parent);
if (nextTok == scope->bodyEnd) if (nextTok == scope->bodyEnd)
break; break;
@ -1562,6 +1574,7 @@ void CheckUninitVar::valueFlowUninit()
} }
} }
} }
}
std::string CheckUninitVar::MyFileInfo::toString() const std::string CheckUninitVar::MyFileInfo::toString() const
{ {

16
lib/forwardanalyzer.cpp
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@ -5,7 +5,6 @@
#include "symboldatabase.h" #include "symboldatabase.h"
#include "token.h" #include "token.h"
#include "valueptr.h" #include "valueptr.h"
#include "checknullpointer.h" // UninitValue => isPointerDeref
#include <algorithm> #include <algorithm>
#include <cstdio> #include <cstdio>
@ -193,21 +192,8 @@ struct ForwardTraversal {
Progress update(Token* tok) { Progress update(Token* tok) {
Analyzer::Action action = analyzer->analyze(tok, Analyzer::Direction::Forward); Analyzer::Action action = analyzer->analyze(tok, Analyzer::Direction::Forward);
actions |= action; actions |= action;
if (!action.isNone() && !analyzeOnly) { if (!action.isNone() && !analyzeOnly)
analyzer->update(tok, action, Analyzer::Direction::Forward); analyzer->update(tok, action, Analyzer::Direction::Forward);
// uninit value => skip further analysis
auto v = std::find_if(tok->values().begin(), tok->values().end(), std::mem_fn(&ValueFlow::Value::isUninitValue));
if (v != tok->values().end()) {
if (tok->valueType() && tok->valueType()->pointer > 0) {
bool unknown = false;
if (CheckNullPointer::isPointerDeRef(tok, unknown, settings))
return Break(Analyzer::Terminate::Modified);
}
if (Token::Match(tok->astParent(), "[,(]") && !isSizeOfEtc(tok->astParent()->previous()))
return Break(Analyzer::Terminate::Modified);
}
}
if (action.isInconclusive() && !analyzer->lowerToInconclusive()) if (action.isInconclusive() && !analyzer->lowerToInconclusive())
return Break(Analyzer::Terminate::Inconclusive); return Break(Analyzer::Terminate::Inconclusive);
if (action.isInvalid()) if (action.isInvalid())

7
test/testuninitvar.cpp
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@ -4563,8 +4563,7 @@ private:
" arc << p;\n" // <- TODO initialization? " arc << p;\n" // <- TODO initialization?
" return *p;\n" " return *p;\n"
"}"); "}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n" ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str());
"[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
// #4320 // #4320
valueFlowUninit("void f() {\n" valueFlowUninit("void f() {\n"
@ -4572,9 +4571,7 @@ private:
" a << 1;\n" " a << 1;\n"
" return a;\n" " return a;\n"
"}"); "}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n" ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
"[test.cpp:4]: (error) Uninitialized variable: a\n",
errout.str());
// #9750 // #9750
valueFlowUninit("struct S {\n" valueFlowUninit("struct S {\n"