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Fixed #6309 (FP: checkRedundantAssignment should not warn for pointer alias)

This commit is contained in:
Daniel Marjamäki 2016-08-08 21:43:00 +02:00
parent b0a502227c
commit bd21cd7c85
2 changed files with 35 additions and 24 deletions
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4
lib/checkother.cpp
View File

@ -627,8 +627,8 @@ void CheckOther::checkRedundantAssignment()
if (memfunc && tok->strAt(-1) != "(" && tok->strAt(-1) != "=") {
const Token* param1 = tok->tokAt(2);
writtenArgumentsEnd = param1->next();
if (param1->varId() && param1->strAt(1) == "," && !Token::Match(tok, "strcat|strncat|wcscat|wcsncat")) {
if (tok->str() == "memset" && initialized.find(param1->varId()) == initialized.end() && param1->variable() && param1->variable()->isLocal() && param1->variable()->isArray())
if (param1->varId() && param1->strAt(1) == "," && !Token::Match(tok, "strcat|strncat|wcscat|wcsncat") && param1->variable() && param1->variable()->isLocal() && param1->variable()->isArray()) {
if (tok->str() == "memset" && initialized.find(param1->varId()) == initialized.end())
initialized.insert(param1->varId());
else {
const std::map<unsigned int, const Token*>::const_iterator it = memAssignments.find(param1->varId());

55
test/testother.cpp
View File

@ -1637,8 +1637,8 @@ private:
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (warning) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo(char *str, int a)\n"
"{\n"
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
@ -1649,8 +1649,8 @@ private:
"}", 0, false, false, false);
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:8]: (warning) Buffer 'str' is being written before its old content has been used. 'break;' missing?\n", errout.str());
check("void foo(char *str, int a)\n"
"{\n"
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
@ -1661,8 +1661,8 @@ private:
"}");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:8]: (warning) Buffer 'str' is being written before its old content has been used. 'break;' missing?\n", errout.str());
check("void foo(char *str, int a)\n"
"{\n"
check("void foo(int a) {\n"
" char str[10];\n"
" int z = 0;\n"
" switch (a)\n"
" {\n"
@ -1676,8 +1676,8 @@ private:
"}", nullptr, false, false, false);
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:10]: (warning) Buffer 'str' is being written before its old content has been used. 'break;' missing?\n", errout.str());
check("void foo(char *str, int a)\n"
"{\n"
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
@ -1690,8 +1690,8 @@ private:
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char *str, int a)\n"
"{\n"
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
@ -5089,26 +5089,35 @@ private:
void redundantMemWrite() {
// Simple tests
check("void f(void* a) {\n"
check("void f() {\n"
" char a[10];\n"
" memcpy(a, foo, bar);\n"
" memset(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void* a;\n"
"void f() {\n"
check("void f() {\n"
" char a[10];\n"
" strcpy(a, foo);\n"
" strncpy(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void f() {\n"
" void* a = foo();\n"
" sprintf(a, foo);\n"
" char a[10];\n"
" sprintf(a, \"foo\");\n"
" memmove(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void f(char *filename) {\n"
" char *p = strrchr(filename,'.');\n"
" strcpy(p, \"foo\");\n"
" dostuff(filename);\n"
" strcpy(p, \"foo\");\n"
"}");
ASSERT_EQUALS("", errout.str());
// Writing to different parts of a buffer
check("void f(void* a) {\n"
" memcpy(a, foo, bar);\n"
@ -5125,20 +5134,22 @@ private:
ASSERT_EQUALS("", errout.str());
// strcat is special
check("void f(void* a) {\n"
check("void f() {\n"
" char a[10];\n"
" strcpy(a, foo);\n"
" strcat(a, bar);\n" // Not redundant
" strcpy(a, x);\n" // Redundant
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
// Tests with function call between copy
check("void f(void* a) {\n"
check("void f() {\n"
" char a[10];\n"
" snprintf(a, foo, bar);\n"
" bar();\n"
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void* a;\n"
"void f() {\n"
@ -5149,12 +5160,12 @@ private:
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" void* a = foo();\n"
" char a[10];\n"
" memset(a, 0, size);\n"
" bar();\n"
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", "", errout.str());
check("void bar(void* a) {}\n"
"void f(void* a) {\n"