Implement more C23 changes

include/stddef.h

@@ -19,7 +19,7 @@ typedef struct {
 
 #if __STDC_VERSION__ >= 202311L
 #  pragma GCC diagnostic push
-#  pragma GCC diagnostic ignored "-Wpre-c2x-compat"
+#  pragma GCC diagnostic ignored "-Wpre-c23-compat"
    typedef typeof(nullptr) nullptr_t;
 #  pragma GCC diagnostic pop
 

src/Attribute.zig

@@ -18,20 +18,20 @@ syntax: Syntax,
 args: Arguments,
 
 pub const Syntax = enum {
-    c2x,
+    c23,
     declspec,
     gnu,
     keyword,
 };
 
 pub const Kind = enum {
-    c2x,
+    c23,
     declspec,
     gnu,
 
     pub fn toSyntax(kind: Kind) Syntax {
         return switch (kind) {
-            .c2x => .c2x,
+            .c23 => .c23,
             .declspec => .declspec,
             .gnu => .gnu,
         };
@@ -684,7 +684,7 @@ pub fn fromString(kind: Kind, namespace: ?[]const u8, name: []const u8) ?Tag {
         tag: Tag,
         gnu: bool = false,
         declspec: bool = false,
-        c2x: bool = false,
+        c23: bool = false,
     };
     const attribute_names = @import("Attribute/names.def").with(Properties);
 
@@ -707,7 +707,7 @@ pub fn fromString(kind: Kind, namespace: ?[]const u8, name: []const u8) ?Tag {
     return null;
 }
 
-fn normalize(name: []const u8) []const u8 {
+pub fn normalize(name: []const u8) []const u8 {
     if (name.len >= 4 and mem.startsWith(u8, name, "__") and mem.endsWith(u8, name, "__")) {
         return name[2 .. name.len - 2];
     }

src/Attribute/names.def

@@ -1,18 +1,18 @@
 # multiple
 deprecated
     .tag = .deprecated
-    .c2x = true
+    .c23 = true
     .gnu = true
     .declspec = true
 
 fallthrough
     .tag = .fallthrough
-    .c2x = true
+    .c23 = true
     .gnu = true
 
 noreturn
     .tag = .@"noreturn"
-    .c2x = true
+    .c23 = true
     .gnu = true
     .declspec = true
 
@@ -26,22 +26,22 @@ noinline
     .gnu = true
     .declspec = true
 
-# c2x only
+# c23 only
 nodiscard
     .tag = .nodiscard
-    .c2x = true
+    .c23 = true
 
 reproducible
     .tag = .reproducible
-    .c2x = true
+    .c23 = true
 
 unsequenced
     .tag = .unsequenced
-    .c2x = true
+    .c23 = true
 
 maybe_unused
     .tag = .unused
-    .c2x = true
+    .c23 = true
 
 # gnu only
 access

src/CodeGen.zig

@@ -1001,6 +1001,9 @@ fn genLval(c: *CodeGen, node: NodeIndex) Error!Ir.Ref {
         .member_access_expr,
         .member_access_ptr_expr,
         .array_access_expr,
+        .static_compound_literal_expr,
+        .thread_local_compound_literal_expr,
+        .static_thread_local_compound_literal_expr,
         => return c.comp.diag.fatalNoSrc("TODO CodeGen.genLval {}\n", .{c.node_tag[@intFromEnum(node)]}),
         else => unreachable, // Not an lval expression.
     }

src/Compilation.zig

@@ -1259,15 +1259,24 @@ pub const IncludeType = enum {
     angle_brackets,
 };
 
-fn getFileContents(comp: *Compilation, path: []const u8) ![]const u8 {
+fn getFileContents(comp: *Compilation, path: []const u8, limit: ?u32) ![]const u8 {
     if (mem.indexOfScalar(u8, path, 0) != null) {
         return error.FileNotFound;
     }
 
     const file = try std.fs.cwd().openFile(path, .{});
     defer file.close();
 
-    return file.readToEndAlloc(comp.gpa, std.math.maxInt(u32));
+    var buf = std.ArrayList(u8).init(comp.gpa);
+    defer buf.deinit();
+
+    const max = limit orelse std.math.maxInt(u32);
+    file.reader().readAllArrayList(&buf, max) catch |e| switch (e) {
+        error.StreamTooLong => if (limit == null) return e,
+        else => return e,
+    };
+
+    return buf.toOwnedSlice();
 }
 
 pub fn findEmbed(
@@ -1276,9 +1285,10 @@ pub fn findEmbed(
     includer_token_source: Source.Id,
     /// angle bracket vs quotes
     include_type: IncludeType,
+    limit: ?u32,
 ) !?[]const u8 {
     if (std.fs.path.isAbsolute(filename)) {
-        return if (comp.getFileContents(filename)) |some|
+        return if (comp.getFileContents(filename, limit)) |some|
             some
         else |err| switch (err) {
             error.OutOfMemory => |e| return e,
@@ -1295,7 +1305,7 @@ pub fn findEmbed(
 
     while (try it.nextWithFile(filename, stack_fallback.get())) |found| {
         defer stack_fallback.get().free(found.path);
-        if (comp.getFileContents(found.path)) |some|
+        if (comp.getFileContents(found.path, limit)) |some|
             return some
         else |err| switch (err) {
             error.OutOfMemory => return error.OutOfMemory,

src/Diagnostics.zig

@@ -100,7 +100,7 @@ pub const Options = struct {
     @"array-bounds": Kind = .default,
     @"int-conversion": Kind = .default,
     @"pointer-type-mismatch": Kind = .default,
-    @"c2x-extensions": Kind = .default,
+    @"c23-extensions": Kind = .default,
     @"incompatible-pointer-types": Kind = .default,
     @"excess-initializers": Kind = .default,
     @"division-by-zero": Kind = .default,
@@ -164,7 +164,7 @@ pub const Options = struct {
     @"keyword-macro": Kind = .default,
     @"pointer-arith": Kind = .default,
     @"sizeof-array-argument": Kind = .default,
-    @"pre-c2x-compat": Kind = .default,
+    @"pre-c23-compat": Kind = .default,
     @"pointer-bool-conversion": Kind = .default,
     @"string-conversion": Kind = .default,
     @"gnu-auto-type": Kind = .default,
@@ -179,6 +179,9 @@ pub const Options = struct {
     @"four-char-constants": Kind = .default,
     @"unknown-escape-sequence": Kind = .default,
     @"invalid-pp-token": Kind = .default,
+    @"deprecated-non-prototype": Kind = .default,
+    @"duplicate-embed-param": Kind = .default,
+    @"unsupported-embed-param": Kind = .default,
 };
 
 const messages = struct {
@@ -383,7 +386,7 @@ const messages = struct {
         const kind = .warning;
         const all = true;
     };
-    pub const missing_type_specifier_c2x = struct {
+    pub const missing_type_specifier_c23 = struct {
         const msg = "a type specifier is required for all declarations";
         const kind = .@"error";
     };
@@ -521,10 +524,10 @@ const messages = struct {
         const kind = .@"error";
     };
     pub const implicit_func_decl = struct {
-        const msg = "implicit declaration of function '{s}' is invalid in C99";
+        const msg = "call to undeclared function '{s}'; ISO C99 and later do not support implicit function declarations";
         const extra = .str;
         const opt = "implicit-function-declaration";
-        const kind = .warning;
+        const kind = .@"error";
         const all = true;
     };
     pub const unknown_builtin = struct {
@@ -1136,17 +1139,17 @@ const messages = struct {
         const kind = .@"error";
     };
     pub const static_assert_missing_message = struct {
-        const msg = "static_assert with no message is a C2X extension";
-        const opt = "c2x-extensions";
+        const msg = "static_assert with no message is a C23 extension";
+        const opt = "c23-extensions";
         const kind = .warning;
-        const suppress_version = .c2x;
+        const suppress_version = .c23;
     };
-    pub const pre_c2x_compat = struct {
-        const msg = "{s} is incompatible with C standards before C2x";
+    pub const pre_c23_compat = struct {
+        const msg = "{s} is incompatible with C standards before C23";
         const extra = .str;
         const kind = .off;
-        const suppress_unless_version = .c2x;
-        const opt = "pre-c2x-compat";
+        const suppress_unless_version = .c23;
+        const opt = "pre-c23-compat";
     };
     pub const unbound_vla = struct {
         const msg = "variable length array must be bound in function definition";
@@ -1449,10 +1452,10 @@ const messages = struct {
         const pedantic = true;
     };
     pub const omitting_parameter_name = struct {
-        const msg = "omitting the parameter name in a function definition is a C2x extension";
-        const opt = "c2x-extensions";
+        const msg = "omitting the parameter name in a function definition is a C23 extension";
+        const opt = "c23-extensions";
         const kind = .warning;
-        const suppress_version = .c2x;
+        const suppress_version = .c23;
     };
     pub const non_int_bitfield = struct {
         const msg = "bit-field has non-integer type '{s}'";
@@ -2226,7 +2229,7 @@ const messages = struct {
         const kind = .off;
         const pedantic = true;
         const opt = "bit-int-extension";
-        const suppress_version = .c2x;
+        const suppress_version = .c23;
     };
     pub const unsigned_bit_int_too_small = struct {
         const msg = "{s} must have a bit size of at least 1";
@@ -2305,10 +2308,10 @@ const messages = struct {
         const kind = .@"error";
     };
     pub const bitint_suffix = struct {
-        const msg = "'_BitInt' suffix for literals is a C2x extension";
-        const opt = "c2x-extensions";
+        const msg = "'_BitInt' suffix for literals is a C23 extension";
+        const opt = "c23-extensions";
         const kind = .warning;
-        const suppress_version = .c2x;
+        const suppress_version = .c23;
     };
     pub const auto_type_extension = struct {
         const msg = "'__auto_type' is a GNU extension";
@@ -2468,21 +2471,21 @@ const messages = struct {
         const extra = .ascii;
     };
     pub const ucn_basic_char_warning = struct {
-        const msg = "specifying character '{c}' with a universal character name is incompatible with C standards before C2x";
+        const msg = "specifying character '{c}' with a universal character name is incompatible with C standards before C23";
         const kind = .off;
         const extra = .ascii;
-        const suppress_unless_version = .c2x;
-        const opt = "pre-c2x-compat";
+        const suppress_unless_version = .c23;
+        const opt = "pre-c23-compat";
     };
     pub const ucn_control_char_error = struct {
         const msg = "universal character name refers to a control character";
         const kind = .@"error";
     };
     pub const ucn_control_char_warning = struct {
-        const msg = "universal character name referring to a control character is incompatible with C standards before C2x";
+        const msg = "universal character name referring to a control character is incompatible with C standards before C23";
         const kind = .off;
-        const suppress_unless_version = .c2x;
-        const opt = "pre-c2x-compat";
+        const suppress_unless_version = .c23;
+        const opt = "pre-c23-compat";
     };
     pub const c89_ucn_in_literal = struct {
         const msg = "universal character names are only valid in C99 or later";
@@ -2546,6 +2549,66 @@ const messages = struct {
         const msg = "unterminated comment";
         const kind = .@"error";
     };
+    pub const def_no_proto_deprecated = struct {
+        const msg = "a function definition without a prototype is deprecated in all versions of C and is not supported in C23";
+        const kind = .warning;
+        const opt = "deprecated-non-prototype";
+    };
+    pub const passing_args_to_kr = struct {
+        const msg = "passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C23";
+        const kind = .warning;
+        const opt = "deprecated-non-prototype";
+    };
+    pub const unknown_type_name = struct {
+        const msg = "unknown type name '{s}'";
+        const kind = .@"error";
+        const extra = .str;
+    };
+    pub const label_compound_end = struct {
+        const msg = "label at end of compound statement is a C23 extension";
+        const opt = "c23-extensions";
+        const kind = .warning;
+        const suppress_version = .c23;
+    };
+    pub const u8_char_lit = struct {
+        const msg = "UTF-8 character literal is a C23 extension";
+        const opt = "c23-extensions";
+        const kind = .warning;
+        const suppress_version = .c23;
+    };
+    pub const malformed_embed_param = struct {
+        const msg = "unexpected token in embed parameter";
+        const kind = .@"error";
+    };
+    pub const malformed_embed_limit = struct {
+        const msg = "the limit parameter expects one non-negative integer as a parameter";
+        const kind = .@"error";
+    };
+    pub const duplicate_embed_param = struct {
+        const msg = "duplicate embed parameter '{s}'";
+        const kind = .warning;
+        const extra = .str;
+        const opt = "duplicate-embed-param";
+    };
+    pub const unsupported_embed_param = struct {
+        const msg = "unsupported embed parameter '{s}' embed parameter";
+        const kind = .warning;
+        const extra = .str;
+        const opt = "unsupported-embed-param";
+    };
+    pub const invalid_compound_literal_storage_class = struct {
+        const msg = "compound literal cannot have {s} storage class";
+        const kind = .@"error";
+        const extra = .str;
+    };
+    pub const va_opt_lparen = struct {
+        const msg = "missing '(' following __VA_OPT__";
+        const kind = .@"error";
+    };
+    pub const va_opt_rparen = struct {
+        const msg = "unterminated __VA_OPT__ argument list";
+        const kind = .@"error";
+    };
 };
 
 list: std.ArrayListUnmanaged(Message) = .{},

src/Driver.zig

@@ -87,8 +87,8 @@ pub const usage =
     \\  -c, --compile           Only run preprocess, compile, and assemble steps
     \\  -D <macro>=<value>      Define <macro> to <value> (defaults to 1)
     \\  -E                      Only run the preprocessor
-    \\  -fchar8_t               Enable char8_t (enabled by default in C2X and later)
-    \\  -fno-char8_t            Disable char8_t (disabled by default for pre-C2X)
+    \\  -fchar8_t               Enable char8_t (enabled by default in C23 and later)
+    \\  -fno-char8_t            Disable char8_t (disabled by default for pre-C23)
     \\  -fcolor-diagnostics     Enable colors in diagnostics
     \\  -fno-color-diagnostics  Disable colors in diagnostics
     \\  -fdeclspec              Enable support for __declspec attributes