ExprEngine: sizeof()

lib/exprengine.cpp

@@ -1170,6 +1170,18 @@ static ExprEngine::ValuePtr executeAssign(const Token *tok, Data &data)
 
 static ExprEngine::ValuePtr executeFunctionCall(const Token *tok, Data &data)
 {
+    if (Token::simpleMatch(tok->previous(), "sizeof (")) {
+        ExprEngine::ValuePtr retVal;
+        if (tok->hasKnownIntValue()) {
+            const MathLib::bigint value = tok->getKnownIntValue();
+            retVal = std::make_shared<ExprEngine::IntRange>(std::to_string(value), value, value);
+        } else {
+            retVal = std::make_shared<ExprEngine::IntRange>(data.getNewSymbolName(), 1, 0x7fffffff);
+        }
+        call(data.callbacks, tok, retVal, &data);
+        return retVal;
+    }
+
     std::vector<ExprEngine::ValuePtr> argValues;
     for (const Token *argtok : getArguments(tok)) {
         auto val = executeExpression(argtok, data);

test/testexprengine.cpp

@@ -72,6 +72,7 @@ private:
         TEST_CASE(functionCall1);
         TEST_CASE(functionCall2);
         TEST_CASE(functionCall3);
+        TEST_CASE(functionCall4);
 
         TEST_CASE(int1);
 
@@ -435,6 +436,10 @@ private:
         ASSERT_EQUALS("-2147483648:2147483647", getRange("int fgets(int, const char *, void *); void f() { int x = -1; fgets(stdin, \"%d\", &x); x=x; }", "x=x"));
     }
 
+    void functionCall4() {
+        ASSERT_EQUALS("1:2147483647", getRange("void f() { sizeof(data); }", "sizeof(data)"));
+    }
+
 
     void int1() {
         ASSERT_EQUALS("(declare-fun $1 () Int)\n"