misra: Fix crash in misra_9x when there is unknown constant used as array size (#5229)

.github/workflows/CI-unixish.yml

@@ -392,7 +392,7 @@ jobs:
         run: |
           ./cppcheck --error-exitcode=1 --inline-suppr --addon=threadsafety addons/test/threadsafety
           ./cppcheck --error-exitcode=1 --inline-suppr --addon=threadsafety --std=c++03 addons/test/threadsafety
-          ./cppcheck --error-exitcode=1 --addon=misra addons/test/misra/crash*.c
+          ./cppcheck --error-exitcode=1 --inline-suppr --addon=misra addons/test/misra/crash*.c
           ./cppcheck --addon=misra --enable=style --inline-suppr --enable=information --error-exitcode=1 addons/test/misra/misra-ctu-*-test.c
           pushd addons/test
           # We'll force C89 standard to enable an additional verification for

addons/misra_9.py

@@ -1,3 +1,5 @@
+import cppcheckdata
+
 # Holds information about an array, struct or union's element definition.
 class ElementDef:
     def __init__(self, elementType, name, valueType, dimensions = None):
@@ -381,6 +383,39 @@ class InitializerParser:
                     break
 
 def misra_9_x(self, data, rule, rawTokens = None):
+    # If there are arrays with unknown size constants then we need to warn about missing configuration
+    # and bailout
+    has_config_errors = False
+    for var in data.variables:
+        if not var.isArray or var.nameToken is None or not cppcheckdata.simpleMatch(var.nameToken.next,'['):
+            continue
+        tok = var.nameToken.next
+        while tok.str == '[':
+            sz = tok.astOperand2
+            if sz and sz.getKnownIntValue() is None:
+                has_var = False
+                unknown_constant = False
+                tokens = [sz]
+                while len(tokens) > 0:
+                    t = tokens[-1]
+                    tokens = tokens[:-1]
+                    if t:
+                        if t.isName and t.getKnownIntValue() is None:
+                            if t.varId or t.variable:
+                                has_var = True
+                                continue
+                            unknown_constant = True
+                            cppcheckdata.reportError(sz, 'error', f'Unknown constant {t.str}, please review configuration', 'misra', 'config')
+                            has_config_errors = True
+                        if t.isArithmeticalOp:
+                            tokens += [t.astOperand1, t.astOperand2]
+                if not unknown_constant and not has_var:
+                    cppcheckdata.reportError(sz, 'error', 'Unknown array size, please review configuration', 'misra', 'config')
+                    has_config_errors = True
+            tok = tok.link.next
+    if has_config_errors:
+        return
+
     parser = InitializerParser()
 
     for variable in data.variables:

addons/test/misra/crash4.c

@@ -4,6 +4,7 @@ struct ConDesDesc {
     unsigned   Import;
 };
 
+// cppcheck-suppress misra-config
 static ConDesDesc ConDes[CD_TYPE_COUNT] = {
     { 0, 0 },
     { 0, 0 },

addons/test/misra/crash5.c

@@ -0,0 +1,23 @@
+
+struct _boardcnf_ch {
+    // cppcheck-suppress misra-config
+    uint8_t ddr_density[CS_CNT];
+    uint64_t ca_swap;
+};
+
+struct _boardcnf {
+
+    uint16_t dqdm_dly_r;
+    // cppcheck-suppress misra-config
+    struct _boardcnf_ch ch[DRAM_CH_CNT];
+};
+
+static const struct _boardcnf boardcnfs[1] = {
+    {
+        0x0a0,
+        {
+            { {0x02, 0x02}, 0x00345201 },
+            { {0x02, 0x02}, 0x00302154 }
+        }
+    },
+};

addons/test/misra/misra-test.c

@@ -586,10 +586,6 @@ static void misra_9_struct_initializers(void) {
     struct1 os1 = { i1: 1, i2: 2 }; // 10.4 13.4
 }
 
-static void misra_9_broken_initializers(void) {
-    char a[UNKNOWN_MACRO] = { 19, 23, 0 };             // 18.8
-}
-
 static void misra_9_2(void) {
     union misra_9_2_union {     // 19.2
         char c;