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Tokenizer: simplify known variable value inside conditional block

This commit is contained in:
Daniel Marjamäki 2012-03-12 17:32:30 +01:00
parent 533db6421f
commit a9d56f2738
2 changed files with 31 additions and 0 deletions
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16
lib/tokenize.cpp
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@ -6115,6 +6115,22 @@ bool Tokenizer::simplifyKnownVariables()
ret |= simplifyKnownVariablesSimplify(&tok2, tok3, varid, structname, value, valueVarId, valueIsPointer, valueToken, indentlevel);
}
else if (Token::Match(tok2, "( %var% == %num% ) {")) {
const unsigned int varid = tok2->next()->varId();
if (varid == 0)
continue;
const std::string structname = "";
const Token *valueToken = tok2->tokAt(3);
std::string value(tok2->strAt(3));
const unsigned int valueVarId = 0;
const bool valueIsPointer = false;
Token *scopeStart = tok2->tokAt(6);
ret |= simplifyKnownVariablesSimplify(&scopeStart, scopeStart, varid, structname, value, valueIsPointer, valueVarId, valueToken, 0);
}
else if (Token::Match(tok2, "strcpy ( %var% , %str% ) ;")) {
const unsigned int varid(tok2->tokAt(2)->varId());
if (varid == 0)

15
test/testtokenize.cpp
View File

@ -149,6 +149,7 @@ private:
TEST_CASE(simplifyKnownVariables44); // ticket #3117 - don't simplify static variables
TEST_CASE(simplifyKnownVariables45); // ticket #3281 - static constant variable not simplified
TEST_CASE(simplifyKnownVariables46); // ticket #3587 - >>
TEST_CASE(simplifyKnownVariablesIfEq); // if (a==5) => a is 5 in the block
TEST_CASE(simplifyKnownVariablesBailOutAssign1);
TEST_CASE(simplifyKnownVariablesBailOutAssign2);
TEST_CASE(simplifyKnownVariablesBailOutFor1);
@ -2306,6 +2307,20 @@ private:
}
}
void simplifyKnownVariablesIfEq() {
const char code[] = "void f(int x) {\n"
" if (x==5) {\n"
" return x;\n"
" }\n"
"}";
const char expected[] = "void f ( int x ) {\n"
"if ( x == 5 ) {\n"
"return 5 ;\n"
"}\n"
"}";
ASSERT_EQUALS(expected, tokenizeAndStringify(code, true, true, Settings::Unspecified, "test.c"));
}
void simplifyKnownVariablesBailOutAssign1() {
const char code[] = "int foo() {\n"
" int i; i = 0;\n"