#include "c-lex.h"
#include "toplev.h"
+#if USE_CPPLIB
+#include "cpplib.h"
+extern cpp_reader parse_in;
+extern cpp_options parse_options;
+static int cpp_initialized;
+#endif
+
/* In grokdeclarator, distinguish syntactic contexts of declarators. */
enum decl_context
{ NORMAL, /* Ordinary declaration */
tree intHI_type_node;
tree intSI_type_node;
tree intDI_type_node;
+#if HOST_BITS_PER_WIDE_INT >= 64
tree intTI_type_node;
+#endif
tree unsigned_intQI_type_node;
tree unsigned_intHI_type_node;
tree unsigned_intSI_type_node;
tree unsigned_intDI_type_node;
+#if HOST_BITS_PER_WIDE_INT >= 64
tree unsigned_intTI_type_node;
+#endif
/* a VOID_TYPE node. */
int flag_traditional;
+/* Nonzero means use the ISO C9x dialect of C. */
+
+int flag_isoc9x = 0;
+
/* Nonzero means that we have builtin functions, and main is an int */
int flag_hosted = 1;
int warn_implicit_int;
+/* Nonzero means warn about usage of long long when `-pedantic'. */
+
+int warn_long_long = 1;
+
/* Nonzero means message about use of implicit function declarations;
1 means warning; 2 means error. */
to get extra warnings from them. These warnings will be too numerous
to be useful, except in thoroughly ANSIfied programs. */
-int warn_write_strings;
+int flag_const_strings;
/* Nonzero means warn about pointer casts that can drop a type qualifier
from the pointer target type. */
int warn_bad_function_cast;
+/* Warn about functions which might be candidates for attribute noreturn. */
+
+int warn_missing_noreturn;
+
/* Warn about traditional constructs whose meanings changed in ANSI C. */
int warn_traditional;
int warn_sign_compare = -1;
+/* Nonzero means warn about use of multicharacter literals. */
+
+int warn_multichar = 1;
+
/* Nonzero means `$' can be in an identifier. */
#ifndef DOLLARS_IN_IDENTIFIERS
int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
/* Decode the string P as a language-specific option for C.
- Return 1 if it is recognized (and handle it);
- return 0 if not recognized. */
+ Return the number of strings consumed. */
int
-c_decode_option (p)
- char *p;
+c_decode_option (argc, argv)
+ int argc ATTRIBUTE_UNUSED;
+ char **argv;
{
+ int strings_processed;
+ char *p = argv[0];
+#if USE_CPPLIB
+ if (! cpp_initialized)
+ {
+ cpp_reader_init (&parse_in);
+ parse_in.data = &parse_options;
+ cpp_options_init (&parse_options);
+ cpp_initialized = 1;
+ }
+ strings_processed = cpp_handle_option (&parse_in, argc, argv);
+#else
+ strings_processed = 0;
+#endif /* ! USE_CPPLIB */
+
if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
{
flag_traditional = 1;
flag_traditional = 0;
flag_writable_strings = 0;
}
+ else if (!strcmp (p, "-flang-isoc9x"))
+ flag_isoc9x = 1;
else if (!strcmp (p, "-fdollars-in-identifiers"))
dollars_in_ident = 1;
else if (!strcmp (p, "-fno-dollars-in-identifiers"))
}
else if (!strcmp (p, "-Wno-implicit"))
warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
+ else if (!strcmp (p, "-Wlong-long"))
+ warn_long_long = 1;
+ else if (!strcmp (p, "-Wno-long-long"))
+ warn_long_long = 0;
else if (!strcmp (p, "-Wwrite-strings"))
- warn_write_strings = 1;
+ flag_const_strings = 1;
else if (!strcmp (p, "-Wno-write-strings"))
- warn_write_strings = 0;
+ flag_const_strings = 0;
else if (!strcmp (p, "-Wcast-qual"))
warn_cast_qual = 1;
else if (!strcmp (p, "-Wno-cast-qual"))
warn_bad_function_cast = 1;
else if (!strcmp (p, "-Wno-bad-function-cast"))
warn_bad_function_cast = 0;
+ else if (!strcmp (p, "-Wmissing-noreturn"))
+ warn_missing_noreturn = 1;
+ else if (!strcmp (p, "-Wno-missing-noreturn"))
+ warn_missing_noreturn = 0;
else if (!strcmp (p, "-Wpointer-arith"))
warn_pointer_arith = 1;
else if (!strcmp (p, "-Wno-pointer-arith"))
warn_sign_compare = 1;
else if (!strcmp (p, "-Wno-sign-compare"))
warn_sign_compare = 0;
+ else if (!strcmp (p, "-Wmultichar"))
+ warn_multichar = 1;
+ else if (!strcmp (p, "-Wno-multichar"))
+ warn_multichar = 0;
else if (!strcmp (p, "-Wunknown-pragmas"))
/* Set to greater than 1, so that even unknown pragmas in system
headers will be warned about. */
warn_unknown_pragmas = 1;
}
else
- return 0;
+ return strings_processed;
return 1;
}
void
declare_parm_level (definition_flag)
- int definition_flag;
+ int definition_flag ATTRIBUTE_UNUSED;
{
current_binding_level->parm_flag = 1;
}
{
DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
+
+ DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
+ |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
+ DECL_NO_CHECK_MEMORY_USAGE (newdecl)
+ |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
}
pop_obstacks ();
DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
if (DECL_INLINE (newdecl))
- DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
+ DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
}
}
if (different_binding_level)
{
/* Don't output a duplicate symbol or debugging information for this
- declaration. */
- TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
+ declaration.
+
+ Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
+ just have two declarations without a definition. VAR_DECLs may need
+ the same treatment, I'm not sure. */
+ if (TREE_CODE (newdecl) == FUNCTION_DECL)
+ DECL_IGNORED_P (newdecl) = 1;
+ else
+ TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
return 0;
}
DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
DECL_RESULT (x) = DECL_RESULT (oldglobal);
TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
- DECL_ABSTRACT_ORIGIN (x) = oldglobal;
+ DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
}
/* Inner extern decl is built-in if global one is. */
if (DECL_BUILT_IN (oldglobal))
intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
+#if HOST_BITS_PER_WIDE_INT >= 64
intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
- pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
+ pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
+#endif
unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
+#if HOST_BITS_PER_WIDE_INT >= 64
unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
+#endif
float_type_node = make_node (REAL_TYPE);
TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
builtin_function ("__builtin_unwind_init",
build_function_type (void_type_node, endlink),
BUILT_IN_UNWIND_INIT, NULL_PTR);
- builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
- builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
+ builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
+ BUILT_IN_DWARF_CFA, NULL_PTR);
builtin_function ("__builtin_dwarf_fp_regnum",
build_function_type (unsigned_type_node, endlink),
BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
- builtin_function ("__builtin_set_return_addr_reg",
- build_function_type (void_type_node,
- tree_cons (NULL_TREE,
- ptr_type_node,
- endlink)),
- BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
- builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
- BUILT_IN_EH_STUB_OLD, NULL_PTR);
- builtin_function ("__builtin_eh_stub", ptr_ftype_void,
- BUILT_IN_EH_STUB, NULL_PTR);
builtin_function
- ("__builtin_set_eh_regs",
+ ("__builtin_eh_return",
build_function_type (void_type_node,
tree_cons (NULL_TREE, ptr_type_node,
tree_cons (NULL_TREE,
type_for_mode (ptr_mode, 0),
- endlink))),
- BUILT_IN_SET_EH_REGS, NULL_PTR);
+ tree_cons (NULL_TREE,
+ ptr_type_node,
+ endlink)))),
+ BUILT_IN_EH_RETURN, NULL_PTR);
builtin_function ("__builtin_alloca",
build_function_type (ptr_type_node,
integer_type_node,
endlink))),
BUILT_IN_LONGJMP, NULL_PTR);
+ builtin_function ("__builtin_trap",
+ build_function_type (void_type_node, endlink),
+ BUILT_IN_TRAP, NULL_PTR);
/* In an ANSI C program, it is okay to supply built-in meanings
for these functions, since applications cannot validly use them
init_iterators ();
incomplete_decl_finalize_hook = finish_incomplete_decl;
+
+ lang_get_alias_set = c_get_alias_set;
}
/* Return a definition for a builtin function named NAME and whose data type
following code. */
split_specs_attrs (declspecs, &specs, &attrs);
- for (link = declspecs; link; link = TREE_CHAIN (link))
+ for (link = specs; link; link = TREE_CHAIN (link))
{
register tree value = TREE_VALUE (link);
register enum tree_code code = TREE_CODE (value);
/* The corresponding pop_obstacks is in finish_decl. */
push_obstacks_nochange ();
- if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main"))
+ if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
+ && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
warning_with_decl (decl, "`%s' is usually a function");
if (initialized)
if (! flag_no_common || ! TREE_PUBLIC (decl))
DECL_COMMON (decl) = 1;
+#ifdef SET_DEFAULT_DECL_ATTRIBUTES
+ SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
+#endif
+
/* Set attributes here so if duplicate decl, will have proper attributes. */
decl_attributes (decl, attributes, prefix_attributes);
tree type = NULL_TREE;
int longlong = 0;
int constp;
+ int restrictp;
int volatilep;
+ int type_quals = TYPE_UNQUALIFIED;
int inlinep;
int explicit_int = 0;
int explicit_char = 0;
error ("`long long long' is too long for GCC");
else
{
- if (pedantic && ! in_system_header)
+ if (pedantic && ! in_system_header && warn_long_long)
pedwarn ("ANSI C does not support `long long'");
longlong = 1;
}
if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
| (1 << (int) RID_SIGNED)
| (1 << (int) RID_UNSIGNED))))
+ /* Don't warn about typedef foo = bar. */
+ && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
&& ! (in_system_header && ! allocation_temporary_p ()))
{
/* C9x will probably require a diagnostic here.
type = build_complex_type (type);
}
- /* Set CONSTP if this declaration is `const', whether by
- explicit specification or via a typedef.
- Likewise for VOLATILEP. */
-
+ /* Figure out the type qualifiers for the declaration. There are
+ two ways a declaration can become qualified. One is something
+ like `const int i' where the `const' is explicit. Another is
+ something like `typedef const int CI; CI i' where the type of the
+ declaration contains the `const'. */
constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
+ restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
inlinep = !! (specbits & (1 << (int) RID_INLINE));
if (constp > 1)
pedwarn ("duplicate `const'");
+ if (restrictp > 1)
+ pedwarn ("duplicate `restrict'");
if (volatilep > 1)
pedwarn ("duplicate `volatile'");
- if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
+ if (! flag_gen_aux_info && (TYPE_QUALS (type)))
type = TYPE_MAIN_VARIANT (type);
+ type_quals = ((constp ? TYPE_QUAL_CONST : 0)
+ | (restrictp ? TYPE_QUAL_RESTRICT : 0)
+ | (volatilep ? TYPE_QUAL_VOLATILE : 0));
/* Warn if two storage classes are given. Default to `auto'. */
is set correctly. */
type = build_array_type (type, itype);
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
#if 0 /* don't clear these; leave them set so that the array type
or the variable is itself const or volatile. */
- constp = 0;
- volatilep = 0;
+ type_quals = TYPE_UNQUALIFIED;
#endif
if (size_varies)
flag_traditional
? NULL_TREE : arg_types);
#endif
- /* ANSI seems to say that `const int foo ();'
- does not make the function foo const. */
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
- constp = 0;
- volatilep = 0;
+ /* Type qualifiers before the return type of the function
+ qualify the return type, not the function type. */
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
+ type_quals = TYPE_UNQUALIFIED;
type = build_function_type (type, arg_types);
declarator = TREE_OPERAND (declarator, 0);
for the pointer. */
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
- && (constp || volatilep))
- pedwarn ("ANSI C forbids const or volatile function types");
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
- constp = 0;
- volatilep = 0;
+ && type_quals)
+ pedwarn ("ANSI C forbids qualified function types");
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
+ type_quals = TYPE_UNQUALIFIED;
size_varies = 0;
type = build_pointer_type (type);
{
register tree typemodlist;
int erred = 0;
+
+ constp = 0;
+ volatilep = 0;
+ restrictp = 0;
for (typemodlist = TREE_TYPE (declarator); typemodlist;
typemodlist = TREE_CHAIN (typemodlist))
{
- if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
+ tree qualifier = TREE_VALUE (typemodlist);
+
+ if (qualifier == ridpointers[(int) RID_CONST])
constp++;
- else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
+ else if (qualifier == ridpointers[(int) RID_VOLATILE])
volatilep++;
+ else if (qualifier == ridpointers[(int) RID_RESTRICT])
+ restrictp++;
else if (!erred)
{
erred = 1;
pedwarn ("duplicate `const'");
if (volatilep > 1)
pedwarn ("duplicate `volatile'");
+ if (restrictp > 1)
+ pedwarn ("duplicate `restrict'");
+
+ type_quals = ((constp ? TYPE_QUAL_CONST : 0)
+ | (restrictp ? TYPE_QUAL_RESTRICT : 0)
+ | (volatilep ? TYPE_QUAL_VOLATILE : 0));
}
declarator = TREE_OPERAND (declarator, 0);
/* Note that the grammar rejects storage classes
in typenames, fields or parameters */
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
- && (constp || volatilep))
- pedwarn ("ANSI C forbids const or volatile function types");
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
+ && type_quals)
+ pedwarn ("ANSI C forbids qualified function types");
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
decl = build_decl (TYPE_DECL, declarator, type);
if ((specbits & (1 << (int) RID_SIGNED))
|| (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
/* Note that the grammar rejects storage classes
in typenames, fields or parameters */
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
- && (constp || volatilep))
+ && type_quals)
pedwarn ("ANSI C forbids const or volatile function types");
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
pop_obstacks ();
return type;
}
{
/* Transfer const-ness of array into that of type pointed to. */
type = TREE_TYPE (type);
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
type = build_pointer_type (type);
- volatilep = constp = 0;
+ type_quals = TYPE_UNQUALIFIED;
size_varies = 0;
}
else if (TREE_CODE (type) == FUNCTION_TYPE)
{
- if (pedantic && (constp || volatilep))
- pedwarn ("ANSI C forbids const or volatile function types");
- if (constp || volatilep)
- type = c_build_type_variant (type, constp, volatilep);
+ if (pedantic && type_quals)
+ pedwarn ("ANSI C forbids qualified function types");
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
type = build_pointer_type (type);
- volatilep = constp = 0;
+ type_quals = TYPE_UNQUALIFIED;
}
decl = build_decl (PARM_DECL, declarator, type);
type = error_mark_node;
}
/* Move type qualifiers down to element of an array. */
- if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
+ if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
{
- type = build_array_type (c_build_type_variant (TREE_TYPE (type),
- constp, volatilep),
+ type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
+ type_quals),
TYPE_DOMAIN (type));
#if 0 /* Leave the field const or volatile as well. */
- constp = volatilep = 0;
+ type_quals = TYPE_UNQUALIFIED;
#endif
}
decl = build_decl (FIELD_DECL, declarator, type);
decl = build_decl (FUNCTION_DECL, declarator, type);
decl = build_decl_attribute_variant (decl, decl_machine_attr);
- if (pedantic && (constp || volatilep)
- && ! DECL_IN_SYSTEM_HEADER (decl))
- pedwarn ("ANSI C forbids const or volatile functions");
+ if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
+ pedwarn ("ANSI C forbids qualified function types");
if (pedantic
&& TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
- && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
- || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
+ && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
&& ! DECL_IN_SYSTEM_HEADER (decl))
- pedwarn ("ANSI C forbids const or volatile void function return type");
+ pedwarn ("ANSI C forbids qualified void function return type");
- if (volatilep
+ /* GNU C interprets a `volatile void' return type to indicate
+ that the function does not return. */
+ if ((type_quals & TYPE_QUAL_VOLATILE)
&& TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
warning ("`noreturn' function returns non-void value");
/* Record presence of `inline', if it is reasonable. */
if (inlinep)
{
- tree last = tree_last (TYPE_ARG_TYPES (type));
-
if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
warning ("cannot inline function `main'");
else
int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
/* Move type qualifiers down to element of an array. */
- if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
+ if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
{
- type = build_array_type (c_build_type_variant (TREE_TYPE (type),
- constp, volatilep),
+ type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
+ type_quals),
TYPE_DOMAIN (type));
#if 0 /* Leave the variable const or volatile as well. */
- constp = volatilep = 0;
+ type_quals = TYPE_UNQUALIFIED;
#endif
}
DECL_REGISTER (decl) = 1;
/* Record constancy and volatility. */
+ c_apply_type_quals_to_decl (type_quals, decl);
- if (constp)
- TREE_READONLY (decl) = 1;
- if (volatilep)
- {
- TREE_SIDE_EFFECTS (decl) = 1;
- TREE_THIS_VOLATILE (decl) = 1;
- }
/* If a type has volatile components, it should be stored in memory.
Otherwise, the fact that those components are volatile
will be ignored, and would even crash the compiler. */
TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
+ TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
TYPE_MODE (tem) = TYPE_MODE (enumtype);
TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
except for defining how to inline. So set DECL_EXTERNAL in that case. */
DECL_EXTERNAL (decl1) = current_extern_inline;
+#ifdef SET_DEFAULT_DECL_ATTRIBUTES
+ SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
+#endif
+
/* This function exists in static storage.
(This does not mean `static' in the C sense!) */
TREE_STATIC (decl1) = 1;
current_function_returns_null |= can_reach_end;
+ if (warn_missing_noreturn
+ && !TREE_THIS_VOLATILE (fndecl)
+ && !current_function_returns_null
+ && !current_function_returns_value)
+ warning ("function might be possible candidate for attribute `noreturn'");
+
if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
warning ("`noreturn' function does return");
else if (warn_return_type && can_reach_end
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