On Nov 22, 2023, Alexandre Oliva <ol...@adacore.com> wrote:
Ah, nice, that's a great idea, I wish I'd thought of that! Will
do.
Sorry it took me so long, here it is. I added two tests, so that,
regardless of the defaults, we get both circumstances tested, without
repetition.
Regstrapped on x86_64-linux-gnu. Also tested on arm-eabi. Ok to
install?
analyzer: deal with -fshort-enums
On platforms that enable -fshort-enums by default, various switch-
enum
analyzer tests fail, because apply_constraints_for_gswitch doesn't
expect the integral promotion type cast. I've arranged for the code
to cope with those casts.
for gcc/analyzer/ChangeLog
* region-model.cc (has_nondefault_case_for_value_p): Take
enumerate type as a parameter.
(region_model::apply_constraints_for_gswitch): Cope with
integral promotion type casts.
for gcc/testsuite/ChangeLog
* gcc.dg/analyzer/switch-short-enum-1.c: New.
* gcc.dg/analyzer/switch-no-short-enum-1.c: New.
---
gcc/analyzer/region-model.cc | 27 +++-
.../gcc.dg/analyzer/switch-no-short-enum-1.c | 141
++++++++++++++++++++
.../gcc.dg/analyzer/switch-short-enum-1.c | 140
++++++++++++++++++++
3 files changed, 304 insertions(+), 4 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/analyzer/switch-no-short-
enum-1.c
create mode 100644 gcc/testsuite/gcc.dg/analyzer/switch-short-enum-
1.c
diff --git a/gcc/analyzer/region-model.cc b/gcc/analyzer/region-
model.cc
index 2157ad2578b85..6a7a8bc9f4884 100644
--- a/gcc/analyzer/region-model.cc
+++ b/gcc/analyzer/region-model.cc
@@ -5387,10 +5387,10 @@ has_nondefault_case_for_value_p (const
gswitch *switch_stmt, tree int_cst)
has nondefault cases handling all values in the enum. */
static bool
-has_nondefault_cases_for_all_enum_values_p (const gswitch
*switch_stmt)
+has_nondefault_cases_for_all_enum_values_p (const gswitch
*switch_stmt,
+ tree type)
{
gcc_assert (switch_stmt);
- tree type = TREE_TYPE (gimple_switch_index (switch_stmt));
gcc_assert (TREE_CODE (type) == ENUMERAL_TYPE);
for (tree enum_val_iter = TYPE_VALUES (type);
@@ -5426,6 +5426,23 @@ apply_constraints_for_gswitch (const
switch_cfg_superedge &edge,
{
tree index = gimple_switch_index (switch_stmt);
const svalue *index_sval = get_rvalue (index, ctxt);
+ bool check_index_type = true;
+
+ /* With -fshort-enum, there may be a type cast. */
+ if (ctxt && index_sval->get_kind () == SK_UNARYOP
+ && TREE_CODE (index_sval->get_type ()) == INTEGER_TYPE)
+ {
+ const unaryop_svalue *unaryop = as_a <const unaryop_svalue *>
(index_sval);
+ if (unaryop->get_op () == NOP_EXPR
+ && is_a <const initial_svalue *> (unaryop->get_arg ()))
+ if (const initial_svalue *initvalop = (as_a <const
initial_svalue *>
+ (unaryop->get_arg
())))
+ if (TREE_CODE (initvalop->get_type ()) == ENUMERAL_TYPE)
+ {
+ index_sval = initvalop;
+ check_index_type = false;
+ }
+ }
/* If we're switching based on an enum type, assume that the user
is only
working with values from the enum. Hence if this is an
@@ -5437,12 +5454,14 @@ apply_constraints_for_gswitch (const
switch_cfg_superedge &edge,
ctxt
/* Must be an enum value. */
&& index_sval->get_type ()
- && TREE_CODE (TREE_TYPE (index)) == ENUMERAL_TYPE
+ && (!check_index_type
+ || TREE_CODE (TREE_TYPE (index)) == ENUMERAL_TYPE)
&& TREE_CODE (index_sval->get_type ()) == ENUMERAL_TYPE
/* If we have a constant, then we can check it directly. */
&& index_sval->get_kind () != SK_CONSTANT
&& edge.implicitly_created_default_p ()
- && has_nondefault_cases_for_all_enum_values_p (switch_stmt)
+ && has_nondefault_cases_for_all_enum_values_p (switch_stmt,
+ index_sval-
get_type ())
/* Don't do this if there's a chance that the index is
attacker-controlled. */
&& !ctxt->possibly_tainted_p (index_sval))
diff --git a/gcc/testsuite/gcc.dg/analyzer/switch-no-short-enum-1.c
b/gcc/testsuite/gcc.dg/analyzer/switch-no-short-enum-1.c
new file mode 100644
index 0000000000000..98f6d91f97481
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/switch-no-short-enum-1.c
@@ -0,0 +1,141 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fno-short-enums" } */
+/* { dg-skip-if "default" { ! short_enums } } */
+
+#include "analyzer-decls.h"
+
+/* Verify the handling of "switch (enum_value)". */
+
+enum e
+{
+ E_VAL0,
+ E_VAL1,
+ E_VAL2
+};
+
+/* Verify that we assume that "switch (enum)" doesn't follow
implicit
+ "default" if all enum values have cases */
+
+int test_all_values_covered_implicit_default_1 (enum e x)
+{
+ switch (x)
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ case E_VAL2:
+ return 1945;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+}
+
+int test_all_values_covered_implicit_default_2 (enum e x)
+{
+ int result;
+ switch (x)
+ {
+ case E_VAL0:
+ result = 1066;
+ break;
+ case E_VAL1:
+ result = 1776;
+ break;
+ case E_VAL2:
+ result = 1945;
+ break;
+ }
+ return result; /* { dg-bogus "uninitialized" } */
+}
+
+/* Verify that we consider paths that use the implicit default when
not
+ all enum values are covered by cases. */
+
+int test_missing_values_implicit_default_1 (enum e x)
+{
+ switch (x) /* { dg-message "following 'default:' branch" } */
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ }
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 0;
+}
+
+int test_missing_values_implicit_default_2 (enum e x)
+{
+ int result;
+ switch (x) /* { dg-message "following 'default:' branch" } */
+ {
+ case E_VAL0:
+ result = 1066;
+ break;
+ case E_VAL1:
+ result = 1776;
+ break;
+ }
+ return result; /* { dg-warning "uninitialized" } */
+}
+
+/* Verify that explicit "default" isn't rejected. */
+
+int test_all_values_covered_explicit_default_1 (enum e x)
+{
+ switch (x)
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ case E_VAL2:
+ return 1945;
+ default:
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 0;
+ }
+}
+
+int test_missing_values_explicit_default_1 (enum e x)
+{
+ switch (x)
+ {
+ default:
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+ return 0;
+}
+
+int test_missing_values_explicit_default_2 (enum e x)
+{
+ switch (x)
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ default:
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 1945;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+ return 0;
+}
+
+int test_just_default (enum e x)
+{
+ switch (x)
+ {
+ default:
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 42;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+ return 0;
+}
+
diff --git a/gcc/testsuite/gcc.dg/analyzer/switch-short-enum-1.c
b/gcc/testsuite/gcc.dg/analyzer/switch-short-enum-1.c
new file mode 100644
index 0000000000000..384113fde5cbf
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/switch-short-enum-1.c
@@ -0,0 +1,140 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fshort-enums" } */
+/* { dg-skip-if "default" { short_enums } } */
+
+#include "analyzer-decls.h"
+
+/* Verify the handling of "switch (enum_value)". */
+
+enum e
+{
+ E_VAL0,
+ E_VAL1,
+ E_VAL2
+};
+
+/* Verify that we assume that "switch (enum)" doesn't follow
implicit
+ "default" if all enum values have cases */
+
+int test_all_values_covered_implicit_default_1 (enum e x)
+{
+ switch (x)
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ case E_VAL2:
+ return 1945;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+}
+
+int test_all_values_covered_implicit_default_2 (enum e x)
+{
+ int result;
+ switch (x)
+ {
+ case E_VAL0:
+ result = 1066;
+ break;
+ case E_VAL1:
+ result = 1776;
+ break;
+ case E_VAL2:
+ result = 1945;
+ break;
+ }
+ return result; /* { dg-bogus "uninitialized" } */
+}
+
+/* Verify that we consider paths that use the implicit default when
not
+ all enum values are covered by cases. */
+
+int test_missing_values_implicit_default_1 (enum e x)
+{
+ switch (x) /* { dg-message "following 'default:' branch" } */
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ }
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 0;
+}
+
+int test_missing_values_implicit_default_2 (enum e x)
+{
+ int result;
+ switch (x) /* { dg-message "following 'default:' branch" } */
+ {
+ case E_VAL0:
+ result = 1066;
+ break;
+ case E_VAL1:
+ result = 1776;
+ break;
+ }
+ return result; /* { dg-warning "uninitialized" } */
+}
+
+/* Verify that explicit "default" isn't rejected. */
+
+int test_all_values_covered_explicit_default_1 (enum e x)
+{
+ switch (x)
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ case E_VAL2:
+ return 1945;
+ default:
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 0;
+ }
+}
+
+int test_missing_values_explicit_default_1 (enum e x)
+{
+ switch (x)
+ {
+ default:
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+ return 0;
+}
+
+int test_missing_values_explicit_default_2 (enum e x)
+{
+ switch (x)
+ {
+ case E_VAL0:
+ return 1066;
+ case E_VAL1:
+ return 1776;
+ default:
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 1945;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+ return 0;
+}
+
+int test_just_default (enum e x)
+{
+ switch (x)
+ {
+ default:
+ __analyzer_dump_path (); /* { dg-message "path" } */
+ return 42;
+ }
+ __analyzer_dump_path (); /* { dg-bogus "path" } */
+ return 0;
+}
