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Fix #10870 FN constStatement with arrays (#3904)

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chrchr-github 2022-03-25 11:32:16 +01:00 committed by GitHub
parent 796ad6c008
commit e54ad24d2c
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5 changed files with 64 additions and 13 deletions
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2
Makefile
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@ -407,7 +407,7 @@ validateRules:
$(libcppdir)/analyzerinfo.o: lib/analyzerinfo.cpp externals/tinyxml2/tinyxml2.h lib/analyzerinfo.h lib/color.h lib/config.h lib/errorlogger.h lib/errortypes.h lib/importproject.h lib/path.h lib/platform.h lib/suppressions.h lib/utils.h
$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CPPFILESDIR) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(libcppdir)/analyzerinfo.o $(libcppdir)/analyzerinfo.cpp
$(libcppdir)/astutils.o: lib/astutils.cpp lib/astutils.h lib/config.h lib/errortypes.h lib/importproject.h lib/infer.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)/astutils.o: lib/astutils.cpp lib/astutils.h lib/check.h lib/checkclass.h lib/config.h lib/errortypes.h lib/importproject.h lib/infer.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 lib/valueptr.h
$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CPPFILESDIR) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(libcppdir)/astutils.o $(libcppdir)/astutils.cpp
$(libcppdir)/bughuntingchecks.o: lib/bughuntingchecks.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/utils.h lib/valueflow.h

5
lib/astutils.cpp
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@ -31,6 +31,7 @@
#include "utils.h"
#include "valueflow.h"
#include "valueptr.h"
#include "checkclass.h"
#include <algorithm>
#include <functional>
@ -1747,7 +1748,7 @@ bool isConstExpression(const Token *tok, const Library& library, bool pure, bool
return isConstExpression(tok->astOperand1(), library, pure, cpp) && isConstExpression(tok->astOperand2(), library, pure, cpp);
}
bool isWithoutSideEffects(bool cpp, const Token* tok)
bool isWithoutSideEffects(bool cpp, const Token* tok, bool checkArrayAccess)
{
if (!cpp)
return true;
@ -1756,7 +1757,7 @@ bool isWithoutSideEffects(bool cpp, const Token* tok)
tok = tok->astOperand2();
if (tok && tok->varId()) {
const Variable* var = tok->variable();
return var && (!var->isClass() || var->isPointer() || var->isStlType());
return var && (!var->isClass() || var->isPointer() || (checkArrayAccess ? var->isStlType() && !var->isStlType(CheckClass::stl_containers_not_const) : var->isStlType()));
}
return true;
}

2
lib/astutils.h
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@ -227,7 +227,7 @@ bool isConstFunctionCall(const Token* ftok, const Library& library);
bool isConstExpression(const Token *tok, const Library& library, bool pure, bool cpp);
bool isWithoutSideEffects(bool cpp, const Token* tok);
bool isWithoutSideEffects(bool cpp, const Token* tok, bool checkArrayAccess = false);
bool isUniqueExpression(const Token* tok);

14
lib/checkother.cpp
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@ -1769,6 +1769,11 @@ static bool isConstStatement(const Token *tok, bool cpp)
return tok->astParent() ? isConstStatement(tok->astOperand1(), cpp) && isConstStatement(tok->astOperand2(), cpp) : isConstStatement(tok->astOperand2(), cpp);
if (Token::simpleMatch(tok, "?") && Token::simpleMatch(tok->astOperand2(), ":")) // ternary operator
return isConstStatement(tok->astOperand1(), cpp) && isConstStatement(tok->astOperand2()->astOperand1(), cpp) && isConstStatement(tok->astOperand2()->astOperand2(), cpp);
if (Token::simpleMatch(tok, "[") && !Token::Match(tok->tokAt(-2), "%type% %name%") && isWithoutSideEffects(cpp, tok->astOperand1(), /*checkArrayAccess*/ true)) {
if (Token::simpleMatch(tok->astParent(), "["))
return isConstStatement(tok->astOperand2(), cpp) && isConstStatement(tok->astParent(), cpp);
return isConstStatement(tok->astOperand2(), cpp);
}
return false;
}
@ -1801,6 +1806,13 @@ static bool isConstTop(const Token *tok)
else
return tok->astParent()->astOperand1() == tok;
}
if (Token::simpleMatch(tok, "[")) {
const Token* bracTok = tok;
while (Token::simpleMatch(bracTok->astParent(), "["))
bracTok = bracTok->astParent();
if (!bracTok->astParent())
return true;
}
return false;
}
@ -1894,6 +1906,8 @@ void CheckOther::constStatementError(const Token *tok, const std::string &type,
msg = "Redundant code: Found unused result of ternary operator.";
else if (tok->str() == "." && tok->tokType() == Token::Type::eOther)
msg = "Redundant code: Found unused member access.";
else if (tok->str() == "[" && tok->tokType() == Token::Type::eExtendedOp)
msg = "Redundant code: Found unused array access.";
else {
reportError(tok, Severity::debug, "debug", "constStatementError not handled.");
return;

36
test/testincompletestatement.cpp
View File

@ -498,6 +498,42 @@ private:
"[test.cpp:15]: (warning) Redundant code: Found unused member access.\n",
errout.str());
check("struct S { int a[2]{}; };\n"
"struct T { S s; };\n"
"void f() {\n"
" int i[2];\n"
" i[0] = 0;\n"
" i[0];\n" // <--
" S s[1];\n"
" s[0].a[1];\n" // <--
" T t;\n"
" t.s.a[1];\n" // <--
" int j[2][2][1] = {};\n"
" j[0][0][0];\n" // <--
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (warning) Redundant code: Found unused array access.\n"
"[test.cpp:8]: (warning) Redundant code: Found unused array access.\n"
"[test.cpp:10]: (warning) Redundant code: Found unused array access.\n"
"[test.cpp:12]: (warning) Redundant code: Found unused array access.\n",
errout.str());
check("void g() {\n"
" int j[2]{};\n"
" int k[2] = {};\n"
" int l[]{ 1, 2 };\n"
" int m[] = { 1, 2 };\n"
" h(0, j[0], 1);\n"
" C c{ 0, j[0], 1 };\n"
" c[0];\n"
" int j[2][2][2] = {};\n"
" j[h()][0][0];\n"
" j[0][h()][0];\n"
" j[0][0][h()];\n"
" std::map<std::string, int> M;\n"
" M[\"abc\"];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { void* p; };\n" // #10875
"void f(S s) {\n"
" delete (int*)s.p;\n"