C23 keywords

This adds scanner, parser and typechecker support for the new C23 keywords.

Author: kroening

README.md

@@ -6,13 +6,14 @@
 About
 =====
 
-CBMC is a Bounded Model Checker for C and C++ programs. It supports C89, C99,
-most of C11 and most compiler extensions provided by gcc and Visual Studio. It
-also supports SystemC using Scoot. It allows verifying array bounds (buffer
-overflows), pointer safety, exceptions and user-specified assertions.
-Furthermore, it can check C and C++ for consistency with other languages, such
-as Verilog. The verification is performed by unwinding the loops in the program
-and passing the resulting equation to a decision procedure.
+CBMC is a Bounded Model Checker for C and C++ programs.  It supports C89,
+C99, most of C11, C17, C23 and most compiler extensions provided by gcc and
+Visual Studio.  It also supports SystemC using Scoot.  It allows verifying
+array bounds (buffer overflows), pointer safety, exceptions and
+user-specified assertions.  Furthermore, it can check C and C++ for
+consistency with other languages, such as Verilog.  The verification is
+performed by unwinding the loops in the program and passing the resulting
+equation to a decision procedure.
 
 For full information see [cprover.org](http://www.cprover.org/cbmc).
 

doc/architectural/front-page.md

@@ -8,13 +8,14 @@ website</a>; contributors should use the
 <a href="https://github.com/diffblue/cbmc">repository</a> hosted on GitHub. CBMC
 is part of CProver.
 
-CBMC is a Bounded Model Checker for C and C++ programs. It supports C89, C99,
-most of C11 and most compiler extensions provided by gcc and Visual Studio. It
-also supports SystemC using Scoot. It allows verifying array bounds (buffer
-overflows), pointer safety, arithmetic exceptions and user-specified assertions.
-Furthermore, it can check C and C++ for consistency with other languages, such
-as Verilog. The verification is performed by unwinding the loops in the program
-and passing the resulting equation to a decision procedure.
+CBMC is a Bounded Model Checker for C and C++ programs.  It supports C89,
+C99, most of C11, C17, C23 and most compiler extensions provided by gcc and
+Visual Studio.  It also supports SystemC using Scoot.  It allows verifying
+array bounds (buffer overflows), pointer safety, arithmetic exceptions and
+user-specified assertions.  Furthermore, it can check C and C++ for
+consistency with other languages, such as Verilog.  The verification is
+performed by unwinding the loops in the program and passing the resulting
+equation to a decision procedure.
 
 For further information see [cprover.org](http://www.cprover.org/cbmc).
 

doc/man/cbmc.1

@@ -154,7 +154,7 @@ set include file (C/C++)
 \fB\-D\fR macro
 define preprocessor macro (C/C++)
 .TP
-\fB\-\-c89\fR, \fB\-\-c99\fR, \fB\-\-c11\fR
+\fB\-\-c89\fR, \fB\-\-c99\fR, \fB\-\-c11\fR, \fB\-\-c17\fR, \fB\-\-c23\fR
 set C language standard (default: c11)
 .TP
 \fB\-\-cpp98\fR, \fB\-\-cpp03\fR, \fB\-\-cpp11\fR

doc/man/goto-analyzer.1

@@ -425,7 +425,7 @@ set include file (C/C++)
 \fB\-D\fR macro
 define preprocessor macro (C/C++)
 .TP
-\fB\-\-c89\fR, \fB\-\-c99\fR, \fB\-\-c11\fR
+\fB\-\-c89\fR, \fB\-\-c99\fR, \fB\-\-c11\fR, \fB\-\-c17\fR, \fB\-\-c23\fR
 set C language standard (default: c11)
 .TP
 \fB\-\-cpp98\fR, \fB\-\-cpp03\fR, \fB\-\-cpp11\fR

regression/cbmc/_BitInt/_BitInt1.c

@@ -0,0 +1,13 @@
+// _BitInt is a C23 feature
+
+// sizeof
+static_assert(sizeof(unsigned _BitInt(1)) == 1);
+static_assert(sizeof(_BitInt(32)) == 4);
+static_assert(sizeof(_BitInt(33)) == 8);
+static_assert(sizeof(_BitInt(65)) == 16);
+static_assert(sizeof(_BitInt(128)) == 16);
+
+int main()
+{
+  return 0;
+}

regression/cbmc/_BitInt/_BitInt1.desc

@@ -0,0 +1,8 @@
+CORE
+_BitInt1.c
+--c23
+^EXIT=0$
+^SIGNAL=0$
+--
+^warning: ignoring
+^CONVERSION ERROR$

regression/cbmc/_BitInt/_BitInt2.c

@@ -0,0 +1,18 @@
+// _BitInt is a C23 feature
+#include <assert.h>
+
+int main()
+{
+  // casts
+  // assert((_BitInt(4))17 == 1);
+  // assert((_BitInt(4)) - 1 == -1);
+  // assert((unsigned _BitInt(4)) - 1 == 15);
+
+  // promotion (or lack thereof)
+  // assert((unsigned _BitInt(4))15 + (unsigned _BitInt(4))1 == 0);
+  // assert((unsigned _BitInt(4))15 + (unsigned _BitInt(5))1 == 16);
+  // assert((unsigned _BitInt(4))15 + (signed _BitInt(5))1 == -16);
+  // assert((unsigned _BitInt(4))15 + 1 == 16);
+
+  return 0;
+}

regression/cbmc/_BitInt/_BitInt2.desc

@@ -0,0 +1,10 @@
+KNOWNBUG
+_BitInt2.c
+--c23
+^EXIT=0$
+^SIGNAL=0$
+--
+^warning: ignoring
+^CONVERSION ERROR$
+--
+_BitInt implementation is missing.

regression/cbmc/_BitInt/_BitInt3.c

@@ -0,0 +1,11 @@
+// _BitInt is a C23 feature
+#include <assert.h>
+
+int main()
+{
+  // pointers
+  _BitInt(3) x, *p = &x;
+  *p = 1;
+
+  return 0;
+}

regression/cbmc/_BitInt/_BitInt3.desc

@@ -0,0 +1,10 @@
+KNOWNBUG
+_BitInt3.c
+--c23
+^EXIT=0$
+^SIGNAL=0$
+--
+^warning: ignoring
+^CONVERSION ERROR$
+--
+_BitInt implementation is missing.