translate-c: move utility functions to a separate namespace

lib/std/c.zig

@@ -10,7 +10,6 @@ const page_size = std.mem.page_size;
 pub const tokenizer = @import("c/tokenizer.zig");
 pub const Token = tokenizer.Token;
 pub const Tokenizer = tokenizer.Tokenizer;
-pub const builtins = @import("c/builtins.zig");
 
 test {
     _ = tokenizer;

lib/std/meta.zig

@@ -884,319 +884,6 @@ pub fn Vector(comptime len: u32, comptime child: type) type {
     });
 }
 
-/// Given a type and value, cast the value to the type as c would.
-/// This is for translate-c and is not intended for general use.
-pub fn cast(comptime DestType: type, target: anytype) DestType {
-    // this function should behave like transCCast in translate-c, except it's for macros and enums
-    const SourceType = @TypeOf(target);
-    switch (@typeInfo(DestType)) {
-        .Pointer => return castToPtr(DestType, SourceType, target),
-        .Optional => |dest_opt| {
-            if (@typeInfo(dest_opt.child) == .Pointer) {
-                return castToPtr(DestType, SourceType, target);
-            }
-        },
-        .Enum => |enum_type| {
-            if (@typeInfo(SourceType) == .Int or @typeInfo(SourceType) == .ComptimeInt) {
-                const intermediate = cast(enum_type.tag_type, target);
-                return @intToEnum(DestType, intermediate);
-            }
-        },
-        .Int => {
-            switch (@typeInfo(SourceType)) {
-                .Pointer => {
-                    return castInt(DestType, @ptrToInt(target));
-                },
-                .Optional => |opt| {
-                    if (@typeInfo(opt.child) == .Pointer) {
-                        return castInt(DestType, @ptrToInt(target));
-                    }
-                },
-                .Enum => {
-                    return castInt(DestType, @enumToInt(target));
-                },
-                .Int => {
-                    return castInt(DestType, target);
-                },
-                else => {},
-            }
-        },
-        else => {},
-    }
-    return @as(DestType, target);
-}
-
-fn castInt(comptime DestType: type, target: anytype) DestType {
-    const dest = @typeInfo(DestType).Int;
-    const source = @typeInfo(@TypeOf(target)).Int;
-
-    if (dest.bits < source.bits)
-        return @bitCast(DestType, @truncate(Int(source.signedness, dest.bits), target))
-    else
-        return @bitCast(DestType, @as(Int(source.signedness, dest.bits), target));
-}
-
-fn castPtr(comptime DestType: type, target: anytype) DestType {
-    const dest = ptrInfo(DestType);
-    const source = ptrInfo(@TypeOf(target));
-
-    if (source.is_const and !dest.is_const or source.is_volatile and !dest.is_volatile)
-        return @intToPtr(DestType, @ptrToInt(target))
-    else if (@typeInfo(dest.child) == .Opaque)
-        // dest.alignment would error out
-        return @ptrCast(DestType, target)
-    else
-        return @ptrCast(DestType, @alignCast(dest.alignment, target));
-}
-
-fn castToPtr(comptime DestType: type, comptime SourceType: type, target: anytype) DestType {
-    switch (@typeInfo(SourceType)) {
-        .Int => {
-            return @intToPtr(DestType, castInt(usize, target));
-        },
-        .ComptimeInt => {
-            if (target < 0)
-                return @intToPtr(DestType, @bitCast(usize, @intCast(isize, target)))
-            else
-                return @intToPtr(DestType, @intCast(usize, target));
-        },
-        .Pointer => {
-            return castPtr(DestType, target);
-        },
-        .Optional => |target_opt| {
-            if (@typeInfo(target_opt.child) == .Pointer) {
-                return castPtr(DestType, target);
-            }
-        },
-        else => {},
-    }
-    return @as(DestType, target);
-}
-
-fn ptrInfo(comptime PtrType: type) TypeInfo.Pointer {
-    return switch (@typeInfo(PtrType)) {
-        .Optional => |opt_info| @typeInfo(opt_info.child).Pointer,
-        .Pointer => |ptr_info| ptr_info,
-        else => unreachable,
-    };
-}
-
-test "std.meta.cast" {
-    const E = enum(u2) {
-        Zero,
-        One,
-        Two,
-    };
-
-    var i = @as(i64, 10);
-
-    try testing.expect(cast(*u8, 16) == @intToPtr(*u8, 16));
-    try testing.expect(cast(*u64, &i).* == @as(u64, 10));
-    try testing.expect(cast(*i64, @as(?*align(1) i64, &i)) == &i);
-
-    try testing.expect(cast(?*u8, 2) == @intToPtr(*u8, 2));
-    try testing.expect(cast(?*i64, @as(*align(1) i64, &i)) == &i);
-    try testing.expect(cast(?*i64, @as(?*align(1) i64, &i)) == &i);
-
-    try testing.expect(cast(E, 1) == .One);
-
-    try testing.expectEqual(@as(u32, 4), cast(u32, @intToPtr(*u32, 4)));
-    try testing.expectEqual(@as(u32, 4), cast(u32, @intToPtr(?*u32, 4)));
-    try testing.expectEqual(@as(u32, 10), cast(u32, @as(u64, 10)));
-    try testing.expectEqual(@as(u8, 2), cast(u8, E.Two));
-
-    try testing.expectEqual(@bitCast(i32, @as(u32, 0x8000_0000)), cast(i32, @as(u32, 0x8000_0000)));
-
-    try testing.expectEqual(@intToPtr(*u8, 2), cast(*u8, @intToPtr(*const u8, 2)));
-    try testing.expectEqual(@intToPtr(*u8, 2), cast(*u8, @intToPtr(*volatile u8, 2)));
-
-    try testing.expectEqual(@intToPtr(?*c_void, 2), cast(?*c_void, @intToPtr(*u8, 2)));
-
-    const C_ENUM = enum(c_int) {
-        A = 0,
-        B,
-        C,
-        _,
-    };
-    try testing.expectEqual(cast(C_ENUM, @as(i64, -1)), @intToEnum(C_ENUM, -1));
-    try testing.expectEqual(cast(C_ENUM, @as(i8, 1)), .B);
-    try testing.expectEqual(cast(C_ENUM, @as(u64, 1)), .B);
-    try testing.expectEqual(cast(C_ENUM, @as(u64, 42)), @intToEnum(C_ENUM, 42));
-
-    var foo: c_int = -1;
-    try testing.expect(cast(*c_void, -1) == @intToPtr(*c_void, @bitCast(usize, @as(isize, -1))));
-    try testing.expect(cast(*c_void, foo) == @intToPtr(*c_void, @bitCast(usize, @as(isize, -1))));
-    try testing.expect(cast(?*c_void, -1) == @intToPtr(?*c_void, @bitCast(usize, @as(isize, -1))));
-    try testing.expect(cast(?*c_void, foo) == @intToPtr(?*c_void, @bitCast(usize, @as(isize, -1))));
-}
-
-/// Given a value returns its size as C's sizeof operator would.
-/// This is for translate-c and is not intended for general use.
-pub fn sizeof(target: anytype) usize {
-    const T: type = if (@TypeOf(target) == type) target else @TypeOf(target);
-    switch (@typeInfo(T)) {
-        .Float, .Int, .Struct, .Union, .Enum, .Array, .Bool, .Vector => return @sizeOf(T),
-        .Fn => {
-            // sizeof(main) returns 1, sizeof(&main) returns pointer size.
-            // We cannot distinguish those types in Zig, so use pointer size.
-            return @sizeOf(T);
-        },
-        .Null => return @sizeOf(*c_void),
-        .Void => {
-            // Note: sizeof(void) is 1 on clang/gcc and 0 on MSVC.
-            return 1;
-        },
-        .Opaque => {
-            if (T == c_void) {
-                // Note: sizeof(void) is 1 on clang/gcc and 0 on MSVC.
-                return 1;
-            } else {
-                @compileError("Cannot use C sizeof on opaque type " ++ @typeName(T));
-            }
-        },
-        .Optional => |opt| {
-            if (@typeInfo(opt.child) == .Pointer) {
-                return sizeof(opt.child);
-            } else {
-                @compileError("Cannot use C sizeof on non-pointer optional " ++ @typeName(T));
-            }
-        },
-        .Pointer => |ptr| {
-            if (ptr.size == .Slice) {
-                @compileError("Cannot use C sizeof on slice type " ++ @typeName(T));
-            }
-            // for strings, sizeof("a") returns 2.
-            // normal pointer decay scenarios from C are handled
-            // in the .Array case above, but strings remain literals
-            // and are therefore always pointers, so they need to be
-            // specially handled here.
-            if (ptr.size == .One and ptr.is_const and @typeInfo(ptr.child) == .Array) {
-                const array_info = @typeInfo(ptr.child).Array;
-                if ((array_info.child == u8 or array_info.child == u16) and
-                    array_info.sentinel != null and
-                    array_info.sentinel.? == 0)
-                {
-                    // length of the string plus one for the null terminator.
-                    return (array_info.len + 1) * @sizeOf(array_info.child);
-                }
-            }
-            // When zero sized pointers are removed, this case will no
-            // longer be reachable and can be deleted.
-            if (@sizeOf(T) == 0) {
-                return @sizeOf(*c_void);
-            }
-            return @sizeOf(T);
-        },
-        .ComptimeFloat => return @sizeOf(f64), // TODO c_double #3999
-        .ComptimeInt => {
-            // TODO to get the correct result we have to translate
-            // `1073741824 * 4` as `int(1073741824) *% int(4)` since
-            // sizeof(1073741824 * 4) != sizeof(4294967296).
-
-            // TODO test if target fits in int, long or long long
-            return @sizeOf(c_int);
-        },
-        else => @compileError("std.meta.sizeof does not support type " ++ @typeName(T)),
-    }
-}
-
-test "sizeof" {
-    const E = enum(c_int) { One, _ };
-    const S = extern struct { a: u32 };
-
-    const ptr_size = @sizeOf(*c_void);
-
-    try testing.expect(sizeof(u32) == 4);
-    try testing.expect(sizeof(@as(u32, 2)) == 4);
-    try testing.expect(sizeof(2) == @sizeOf(c_int));
-
-    try testing.expect(sizeof(2.0) == @sizeOf(f64));
-
-    try testing.expect(sizeof(E) == @sizeOf(c_int));
-    try testing.expect(sizeof(E.One) == @sizeOf(c_int));
-
-    try testing.expect(sizeof(S) == 4);
-
-    try testing.expect(sizeof([_]u32{ 4, 5, 6 }) == 12);
-    try testing.expect(sizeof([3]u32) == 12);
-    try testing.expect(sizeof([3:0]u32) == 16);
-    try testing.expect(sizeof(&[_]u32{ 4, 5, 6 }) == ptr_size);
-
-    try testing.expect(sizeof(*u32) == ptr_size);
-    try testing.expect(sizeof([*]u32) == ptr_size);
-    try testing.expect(sizeof([*c]u32) == ptr_size);
-    try testing.expect(sizeof(?*u32) == ptr_size);
-    try testing.expect(sizeof(?[*]u32) == ptr_size);
-    try testing.expect(sizeof(*c_void) == ptr_size);
-    try testing.expect(sizeof(*void) == ptr_size);
-    try testing.expect(sizeof(null) == ptr_size);
-
-    try testing.expect(sizeof("foobar") == 7);
-    try testing.expect(sizeof(&[_:0]u16{ 'f', 'o', 'o', 'b', 'a', 'r' }) == 14);
-    try testing.expect(sizeof(*const [4:0]u8) == 5);
-    try testing.expect(sizeof(*[4:0]u8) == ptr_size);
-    try testing.expect(sizeof([*]const [4:0]u8) == ptr_size);
-    try testing.expect(sizeof(*const *const [4:0]u8) == ptr_size);
-    try testing.expect(sizeof(*const [4]u8) == ptr_size);
-
-    try testing.expect(sizeof(sizeof) == @sizeOf(@TypeOf(sizeof)));
-
-    try testing.expect(sizeof(void) == 1);
-    try testing.expect(sizeof(c_void) == 1);
-}
-
-pub const CIntLiteralRadix = enum { decimal, octal, hexadecimal };
-
-fn PromoteIntLiteralReturnType(comptime SuffixType: type, comptime number: comptime_int, comptime radix: CIntLiteralRadix) type {
-    const signed_decimal = [_]type{ c_int, c_long, c_longlong };
-    const signed_oct_hex = [_]type{ c_int, c_uint, c_long, c_ulong, c_longlong, c_ulonglong };
-    const unsigned = [_]type{ c_uint, c_ulong, c_ulonglong };
-
-    const list: []const type = if (@typeInfo(SuffixType).Int.signedness == .unsigned)
-        &unsigned
-    else if (radix == .decimal)
-        &signed_decimal
-    else
-        &signed_oct_hex;
-
-    var pos = mem.indexOfScalar(type, list, SuffixType).?;
-
-    while (pos < list.len) : (pos += 1) {
-        if (number >= math.minInt(list[pos]) and number <= math.maxInt(list[pos])) {
-            return list[pos];
-        }
-    }
-    @compileError("Integer literal is too large");
-}
-
-/// Promote the type of an integer literal until it fits as C would.
-/// This is for translate-c and is not intended for general use.
-pub fn promoteIntLiteral(
-    comptime SuffixType: type,
-    comptime number: comptime_int,
-    comptime radix: CIntLiteralRadix,
-) PromoteIntLiteralReturnType(SuffixType, number, radix) {
-    return number;
-}
-
-test "promoteIntLiteral" {
-    const signed_hex = promoteIntLiteral(c_int, math.maxInt(c_int) + 1, .hexadecimal);
-    try testing.expectEqual(c_uint, @TypeOf(signed_hex));
-
-    if (math.maxInt(c_longlong) == math.maxInt(c_int)) return;
-
-    const signed_decimal = promoteIntLiteral(c_int, math.maxInt(c_int) + 1, .decimal);
-    const unsigned = promoteIntLiteral(c_uint, math.maxInt(c_uint) + 1, .hexadecimal);
-
-    if (math.maxInt(c_long) > math.maxInt(c_int)) {
-        try testing.expectEqual(c_long, @TypeOf(signed_decimal));
-        try testing.expectEqual(c_ulong, @TypeOf(unsigned));
-    } else {
-        try testing.expectEqual(c_longlong, @TypeOf(signed_decimal));
-        try testing.expectEqual(c_ulonglong, @TypeOf(unsigned));
-    }
-}
-
 /// For a given function type, returns a tuple type which fields will
 /// correspond to the argument types.
 ///
@@ -1316,38 +1003,6 @@ pub fn globalOption(comptime name: []const u8, comptime T: type) ?T {
     return @as(T, @field(root, name));
 }
 
-/// This function is for translate-c and is not intended for general use.
-/// Convert from clang __builtin_shufflevector index to Zig @shuffle index
-/// clang requires __builtin_shufflevector index arguments to be integer constants.
-/// negative values for `this_index` indicate "don't care" so we arbitrarily choose 0
-/// clang enforces that `this_index` is less than the total number of vector elements
-/// See https://ziglang.org/documentation/master/#shuffle
-/// See https://clang.llvm.org/docs/LanguageExtensions.html#langext-builtin-shufflevector
-pub fn shuffleVectorIndex(comptime this_index: c_int, comptime source_vector_len: usize) i32 {
-    if (this_index <= 0) return 0;
-
-    const positive_index = @intCast(usize, this_index);
-    if (positive_index < source_vector_len) return @intCast(i32, this_index);
-    const b_index = positive_index - source_vector_len;
-    return ~@intCast(i32, b_index);
-}
-
-test "shuffleVectorIndex" {
-    const vector_len: usize = 4;
-
-    try testing.expect(shuffleVectorIndex(-1, vector_len) == 0);
-
-    try testing.expect(shuffleVectorIndex(0, vector_len) == 0);
-    try testing.expect(shuffleVectorIndex(1, vector_len) == 1);
-    try testing.expect(shuffleVectorIndex(2, vector_len) == 2);
-    try testing.expect(shuffleVectorIndex(3, vector_len) == 3);
-
-    try testing.expect(shuffleVectorIndex(4, vector_len) == -1);
-    try testing.expect(shuffleVectorIndex(5, vector_len) == -2);
-    try testing.expect(shuffleVectorIndex(6, vector_len) == -3);
-    try testing.expect(shuffleVectorIndex(7, vector_len) == -4);
-}
-
 /// Returns whether `error_union` contains an error.
 pub fn isError(error_union: anytype) bool {
     return if (error_union) |_| false else |_| true;
@@ -1357,34 +1012,3 @@ test "isError" {
     try std.testing.expect(isError(math.absInt(@as(i8, -128))));
     try std.testing.expect(!isError(math.absInt(@as(i8, -127))));
 }
-
-/// This function is for translate-c and is not intended for general use.
-/// Constructs a [*c] pointer with the const and volatile annotations
-/// from SelfType for pointing to a C flexible array of ElementType.
-pub fn FlexibleArrayType(comptime SelfType: type, ElementType: type) type {
-    switch (@typeInfo(SelfType)) {
-        .Pointer => |ptr| {
-            return @Type(TypeInfo{ .Pointer = .{
-                .size = .C,
-                .is_const = ptr.is_const,
-                .is_volatile = ptr.is_volatile,
-                .alignment = @alignOf(ElementType),
-                .child = ElementType,
-                .is_allowzero = true,
-                .sentinel = null,
-            } });
-        },
-        else => |info| @compileError("Invalid self type \"" ++ @tagName(info) ++ "\" for flexible array getter: " ++ @typeName(SelfType)),
-    }
-}
-
-test "Flexible Array Type" {
-    const Container = extern struct {
-        size: usize,
-    };
-
-    try testing.expectEqual(FlexibleArrayType(*Container, c_int), [*c]c_int);
-    try testing.expectEqual(FlexibleArrayType(*const Container, c_int), [*c]const c_int);
-    try testing.expectEqual(FlexibleArrayType(*volatile Container, c_int), [*c]volatile c_int);
-    try testing.expectEqual(FlexibleArrayType(*const volatile Container, c_int), [*c]const volatile c_int);
-}

lib/std/zig.zig

@@ -16,6 +16,10 @@ pub const ast = @import("zig/ast.zig");
 pub const system = @import("zig/system.zig");
 pub const CrossTarget = @import("zig/cross_target.zig").CrossTarget;
 
+// Files needed by translate-c.
+pub const c_builtins = @import("zig/c_builtins.zig");
+pub const c_translation = @import("zig/c_translation.zig");
+
 pub const SrcHash = [16]u8;
 
 pub fn hashSrc(src: []const u8) SrcHash {

lib/std/zig/c_translation.zig

@@ -0,0 +1,385 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2021 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
+const std = @import("std");
+const testing = std.testing;
+const math = std.math;
+const mem = std.mem;
+
+/// Given a type and value, cast the value to the type as c would.
+pub fn cast(comptime DestType: type, target: anytype) DestType {
+    // this function should behave like transCCast in translate-c, except it's for macros and enums
+    const SourceType = @TypeOf(target);
+    switch (@typeInfo(DestType)) {
+        .Fn, .Pointer => return castToPtr(DestType, SourceType, target),
+        .Optional => |dest_opt| {
+            if (@typeInfo(dest_opt.child) == .Pointer or @typeInfo(dest_opt.child) == .Fn) {
+                return castToPtr(DestType, SourceType, target);
+            }
+        },
+        .Enum => |enum_type| {
+            if (@typeInfo(SourceType) == .Int or @typeInfo(SourceType) == .ComptimeInt) {
+                const intermediate = cast(enum_type.tag_type, target);
+                return @intToEnum(DestType, intermediate);
+            }
+        },
+        .Int => {
+            switch (@typeInfo(SourceType)) {
+                .Pointer => {
+                    return castInt(DestType, @ptrToInt(target));
+                },
+                .Optional => |opt| {
+                    if (@typeInfo(opt.child) == .Pointer) {
+                        return castInt(DestType, @ptrToInt(target));
+                    }
+                },
+                .Enum => {
+                    return castInt(DestType, @enumToInt(target));
+                },
+                .Int => {
+                    return castInt(DestType, target);
+                },
+                else => {},
+            }
+        },
+        else => {},
+    }
+    return @as(DestType, target);
+}
+
+fn castInt(comptime DestType: type, target: anytype) DestType {
+    const dest = @typeInfo(DestType).Int;
+    const source = @typeInfo(@TypeOf(target)).Int;
+
+    if (dest.bits < source.bits)
+        return @bitCast(DestType, @truncate(std.meta.Int(source.signedness, dest.bits), target))
+    else
+        return @bitCast(DestType, @as(std.meta.Int(source.signedness, dest.bits), target));
+}
+
+fn castPtr(comptime DestType: type, target: anytype) DestType {
+    const dest = ptrInfo(DestType);
+    const source = ptrInfo(@TypeOf(target));
+
+    if (source.is_const and !dest.is_const or source.is_volatile and !dest.is_volatile)
+        return @intToPtr(DestType, @ptrToInt(target))
+    else if (@typeInfo(dest.child) == .Opaque)
+        // dest.alignment would error out
+        return @ptrCast(DestType, target)
+    else
+        return @ptrCast(DestType, @alignCast(dest.alignment, target));
+}
+
+fn castToPtr(comptime DestType: type, comptime SourceType: type, target: anytype) DestType {
+    switch (@typeInfo(SourceType)) {
+        .Int => {
+            return @intToPtr(DestType, castInt(usize, target));
+        },
+        .ComptimeInt => {
+            if (target < 0)
+                return @intToPtr(DestType, @bitCast(usize, @intCast(isize, target)))
+            else
+                return @intToPtr(DestType, @intCast(usize, target));
+        },
+        .Pointer => {
+            return castPtr(DestType, target);
+        },
+        .Optional => |target_opt| {
+            if (@typeInfo(target_opt.child) == .Pointer) {
+                return castPtr(DestType, target);
+            }
+        },
+        else => {},
+    }
+    return @as(DestType, target);
+}
+
+fn ptrInfo(comptime PtrType: type) std.builtin.TypeInfo.Pointer {
+    return switch (@typeInfo(PtrType)) {
+        .Optional => |opt_info| @typeInfo(opt_info.child).Pointer,
+        .Pointer => |ptr_info| ptr_info,
+        else => unreachable,
+    };
+}
+
+test "cast" {
+    const E = enum(u2) {
+        Zero,
+        One,
+        Two,
+    };
+
+    var i = @as(i64, 10);
+
+    try testing.expect(cast(*u8, 16) == @intToPtr(*u8, 16));
+    try testing.expect(cast(*u64, &i).* == @as(u64, 10));
+    try testing.expect(cast(*i64, @as(?*align(1) i64, &i)) == &i);
+
+    try testing.expect(cast(?*u8, 2) == @intToPtr(*u8, 2));
+    try testing.expect(cast(?*i64, @as(*align(1) i64, &i)) == &i);
+    try testing.expect(cast(?*i64, @as(?*align(1) i64, &i)) == &i);
+
+    try testing.expect(cast(E, 1) == .One);
+
+    try testing.expectEqual(@as(u32, 4), cast(u32, @intToPtr(*u32, 4)));
+    try testing.expectEqual(@as(u32, 4), cast(u32, @intToPtr(?*u32, 4)));
+    try testing.expectEqual(@as(u32, 10), cast(u32, @as(u64, 10)));
+    try testing.expectEqual(@as(u8, 2), cast(u8, E.Two));
+
+    try testing.expectEqual(@bitCast(i32, @as(u32, 0x8000_0000)), cast(i32, @as(u32, 0x8000_0000)));
+
+    try testing.expectEqual(@intToPtr(*u8, 2), cast(*u8, @intToPtr(*const u8, 2)));
+    try testing.expectEqual(@intToPtr(*u8, 2), cast(*u8, @intToPtr(*volatile u8, 2)));
+
+    try testing.expectEqual(@intToPtr(?*c_void, 2), cast(?*c_void, @intToPtr(*u8, 2)));
+
+    const C_ENUM = enum(c_int) {
+        A = 0,
+        B,
+        C,
+        _,
+    };
+    try testing.expectEqual(cast(C_ENUM, @as(i64, -1)), @intToEnum(C_ENUM, -1));
+    try testing.expectEqual(cast(C_ENUM, @as(i8, 1)), .B);
+    try testing.expectEqual(cast(C_ENUM, @as(u64, 1)), .B);
+    try testing.expectEqual(cast(C_ENUM, @as(u64, 42)), @intToEnum(C_ENUM, 42));
+
+    var foo: c_int = -1;
+    try testing.expect(cast(*c_void, -1) == @intToPtr(*c_void, @bitCast(usize, @as(isize, -1))));
+    try testing.expect(cast(*c_void, foo) == @intToPtr(*c_void, @bitCast(usize, @as(isize, -1))));
+    try testing.expect(cast(?*c_void, -1) == @intToPtr(?*c_void, @bitCast(usize, @as(isize, -1))));
+    try testing.expect(cast(?*c_void, foo) == @intToPtr(?*c_void, @bitCast(usize, @as(isize, -1))));
+
+    const FnPtr = ?fn (*c_void) void;
+    try testing.expect(cast(FnPtr, 0) == @intToPtr(FnPtr, @as(usize, 0)));
+    try testing.expect(cast(FnPtr, foo) == @intToPtr(FnPtr, @bitCast(usize, @as(isize, -1))));
+}
+
+/// Given a value returns its size as C's sizeof operator would.
+pub fn sizeof(target: anytype) usize {
+    const T: type = if (@TypeOf(target) == type) target else @TypeOf(target);
+    switch (@typeInfo(T)) {
+        .Float, .Int, .Struct, .Union, .Enum, .Array, .Bool, .Vector => return @sizeOf(T),
+        .Fn => {
+            // sizeof(main) returns 1, sizeof(&main) returns pointer size.
+            // We cannot distinguish those types in Zig, so use pointer size.
+            return @sizeOf(T);
+        },
+        .Null => return @sizeOf(*c_void),
+        .Void => {
+            // Note: sizeof(void) is 1 on clang/gcc and 0 on MSVC.
+            return 1;
+        },
+        .Opaque => {
+            if (T == c_void) {
+                // Note: sizeof(void) is 1 on clang/gcc and 0 on MSVC.
+                return 1;
+            } else {
+                @compileError("Cannot use C sizeof on opaque type " ++ @typeName(T));
+            }
+        },
+        .Optional => |opt| {
+            if (@typeInfo(opt.child) == .Pointer) {
+                return sizeof(opt.child);
+            } else {
+                @compileError("Cannot use C sizeof on non-pointer optional " ++ @typeName(T));
+            }
+        },
+        .Pointer => |ptr| {
+            if (ptr.size == .Slice) {
+                @compileError("Cannot use C sizeof on slice type " ++ @typeName(T));
+            }
+            // for strings, sizeof("a") returns 2.
+            // normal pointer decay scenarios from C are handled
+            // in the .Array case above, but strings remain literals
+            // and are therefore always pointers, so they need to be
+            // specially handled here.
+            if (ptr.size == .One and ptr.is_const and @typeInfo(ptr.child) == .Array) {
+                const array_info = @typeInfo(ptr.child).Array;
+                if ((array_info.child == u8 or array_info.child == u16) and
+                    array_info.sentinel != null and
+                    array_info.sentinel.? == 0)
+                {
+                    // length of the string plus one for the null terminator.
+                    return (array_info.len + 1) * @sizeOf(array_info.child);
+                }
+            }
+            // When zero sized pointers are removed, this case will no
+            // longer be reachable and can be deleted.
+            if (@sizeOf(T) == 0) {
+                return @sizeOf(*c_void);
+            }
+            return @sizeOf(T);
+        },
+        .ComptimeFloat => return @sizeOf(f64), // TODO c_double #3999
+        .ComptimeInt => {
+            // TODO to get the correct result we have to translate
+            // `1073741824 * 4` as `int(1073741824) *% int(4)` since
+            // sizeof(1073741824 * 4) != sizeof(4294967296).
+
+            // TODO test if target fits in int, long or long long
+            return @sizeOf(c_int);
+        },
+        else => @compileError("std.meta.sizeof does not support type " ++ @typeName(T)),
+    }
+}
+
+test "sizeof" {
+    const E = enum(c_int) { One, _ };
+    const S = extern struct { a: u32 };
+
+    const ptr_size = @sizeOf(*c_void);
+
+    try testing.expect(sizeof(u32) == 4);
+    try testing.expect(sizeof(@as(u32, 2)) == 4);
+    try testing.expect(sizeof(2) == @sizeOf(c_int));
+
+    try testing.expect(sizeof(2.0) == @sizeOf(f64));
+
+    try testing.expect(sizeof(E) == @sizeOf(c_int));
+    try testing.expect(sizeof(E.One) == @sizeOf(c_int));
+
+    try testing.expect(sizeof(S) == 4);
+
+    try testing.expect(sizeof([_]u32{ 4, 5, 6 }) == 12);
+    try testing.expect(sizeof([3]u32) == 12);
+    try testing.expect(sizeof([3:0]u32) == 16);
+    try testing.expect(sizeof(&[_]u32{ 4, 5, 6 }) == ptr_size);
+
+    try testing.expect(sizeof(*u32) == ptr_size);
+    try testing.expect(sizeof([*]u32) == ptr_size);
+    try testing.expect(sizeof([*c]u32) == ptr_size);
+    try testing.expect(sizeof(?*u32) == ptr_size);
+    try testing.expect(sizeof(?[*]u32) == ptr_size);
+    try testing.expect(sizeof(*c_void) == ptr_size);
+    try testing.expect(sizeof(*void) == ptr_size);
+    try testing.expect(sizeof(null) == ptr_size);
+
+    try testing.expect(sizeof("foobar") == 7);
+    try testing.expect(sizeof(&[_:0]u16{ 'f', 'o', 'o', 'b', 'a', 'r' }) == 14);
+    try testing.expect(sizeof(*const [4:0]u8) == 5);
+    try testing.expect(sizeof(*[4:0]u8) == ptr_size);
+    try testing.expect(sizeof([*]const [4:0]u8) == ptr_size);
+    try testing.expect(sizeof(*const *const [4:0]u8) == ptr_size);
+    try testing.expect(sizeof(*const [4]u8) == ptr_size);
+
+    try testing.expect(sizeof(sizeof) == @sizeOf(@TypeOf(sizeof)));
+
+    try testing.expect(sizeof(void) == 1);
+    try testing.expect(sizeof(c_void) == 1);
+}
+
+pub const CIntLiteralRadix = enum { decimal, octal, hexadecimal };
+
+fn PromoteIntLiteralReturnType(comptime SuffixType: type, comptime number: comptime_int, comptime radix: CIntLiteralRadix) type {
+    const signed_decimal = [_]type{ c_int, c_long, c_longlong };
+    const signed_oct_hex = [_]type{ c_int, c_uint, c_long, c_ulong, c_longlong, c_ulonglong };
+    const unsigned = [_]type{ c_uint, c_ulong, c_ulonglong };
+
+    const list: []const type = if (@typeInfo(SuffixType).Int.signedness == .unsigned)
+        &unsigned
+    else if (radix == .decimal)
+        &signed_decimal
+    else
+        &signed_oct_hex;
+
+    var pos = mem.indexOfScalar(type, list, SuffixType).?;
+
+    while (pos < list.len) : (pos += 1) {
+        if (number >= math.minInt(list[pos]) and number <= math.maxInt(list[pos])) {
+            return list[pos];
+        }
+    }
+    @compileError("Integer literal is too large");
+}
+
+/// Promote the type of an integer literal until it fits as C would.
+pub fn promoteIntLiteral(
+    comptime SuffixType: type,
+    comptime number: comptime_int,
+    comptime radix: CIntLiteralRadix,
+) PromoteIntLiteralReturnType(SuffixType, number, radix) {
+    return number;
+}
+
+test "promoteIntLiteral" {
+    const signed_hex = promoteIntLiteral(c_int, math.maxInt(c_int) + 1, .hexadecimal);
+    try testing.expectEqual(c_uint, @TypeOf(signed_hex));
+
+    if (math.maxInt(c_longlong) == math.maxInt(c_int)) return;
+
+    const signed_decimal = promoteIntLiteral(c_int, math.maxInt(c_int) + 1, .decimal);
+    const unsigned = promoteIntLiteral(c_uint, math.maxInt(c_uint) + 1, .hexadecimal);
+
+    if (math.maxInt(c_long) > math.maxInt(c_int)) {
+        try testing.expectEqual(c_long, @TypeOf(signed_decimal));
+        try testing.expectEqual(c_ulong, @TypeOf(unsigned));
+    } else {
+        try testing.expectEqual(c_longlong, @TypeOf(signed_decimal));
+        try testing.expectEqual(c_ulonglong, @TypeOf(unsigned));
+    }
+}
+
+/// Convert from clang __builtin_shufflevector index to Zig @shuffle index
+/// clang requires __builtin_shufflevector index arguments to be integer constants.
+/// negative values for `this_index` indicate "don't care" so we arbitrarily choose 0
+/// clang enforces that `this_index` is less than the total number of vector elements
+/// See https://ziglang.org/documentation/master/#shuffle
+/// See https://clang.llvm.org/docs/LanguageExtensions.html#langext-builtin-shufflevector
+pub fn shuffleVectorIndex(comptime this_index: c_int, comptime source_vector_len: usize) i32 {
+    if (this_index <= 0) return 0;
+
+    const positive_index = @intCast(usize, this_index);
+    if (positive_index < source_vector_len) return @intCast(i32, this_index);
+    const b_index = positive_index - source_vector_len;
+    return ~@intCast(i32, b_index);
+}
+
+test "shuffleVectorIndex" {
+    const vector_len: usize = 4;
+
+    try testing.expect(shuffleVectorIndex(-1, vector_len) == 0);
+
+    try testing.expect(shuffleVectorIndex(0, vector_len) == 0);
+    try testing.expect(shuffleVectorIndex(1, vector_len) == 1);
+    try testing.expect(shuffleVectorIndex(2, vector_len) == 2);
+    try testing.expect(shuffleVectorIndex(3, vector_len) == 3);
+
+    try testing.expect(shuffleVectorIndex(4, vector_len) == -1);
+    try testing.expect(shuffleVectorIndex(5, vector_len) == -2);
+    try testing.expect(shuffleVectorIndex(6, vector_len) == -3);
+    try testing.expect(shuffleVectorIndex(7, vector_len) == -4);
+}
+
+/// Constructs a [*c] pointer with the const and volatile annotations
+/// from SelfType for pointing to a C flexible array of ElementType.
+pub fn FlexibleArrayType(comptime SelfType: type, ElementType: type) type {
+    switch (@typeInfo(SelfType)) {
+        .Pointer => |ptr| {
+            return @Type(.{ .Pointer = .{
+                .size = .C,
+                .is_const = ptr.is_const,
+                .is_volatile = ptr.is_volatile,
+                .alignment = @alignOf(ElementType),
+                .child = ElementType,
+                .is_allowzero = true,
+                .sentinel = null,
+            } });
+        },
+        else => |info| @compileError("Invalid self type \"" ++ @tagName(info) ++ "\" for flexible array getter: " ++ @typeName(SelfType)),
+    }
+}
+
+test "Flexible Array Type" {
+    const Container = extern struct {
+        size: usize,
+    };
+
+    try testing.expectEqual(FlexibleArrayType(*Container, c_int), [*c]c_int);
+    try testing.expectEqual(FlexibleArrayType(*const Container, c_int), [*c]const c_int);
+    try testing.expectEqual(FlexibleArrayType(*volatile Container, c_int), [*c]volatile c_int);
+    try testing.expectEqual(FlexibleArrayType(*const volatile Container, c_int), [*c]const volatile c_int);
+}

src/translate_c.zig

@@ -12,7 +12,6 @@ const meta = std.meta;
 const ast = @import("translate_c/ast.zig");
 const Node = ast.Node;
 const Tag = Node.Tag;
-const c_builtins = std.c.builtins;
 
 const CallingConvention = std.builtin.CallingConvention;
 
@@ -863,7 +862,7 @@ fn buildFlexibleArrayFn(
     defer block_scope.deinit();
 
     const intermediate_type_name = try block_scope.makeMangledName(c, "Intermediate");
-    const intermediate_type = try Tag.std_meta_flexible_array_type.create(c.arena, .{ .lhs = self_type, .rhs = u8_type });
+    const intermediate_type = try Tag.helpers_flexible_array_type.create(c.arena, .{ .lhs = self_type, .rhs = u8_type });
     const intermediate_type_decl = try Tag.var_simple.create(c.arena, .{
         .name = intermediate_type_name,
         .init = intermediate_type,
@@ -872,7 +871,7 @@ fn buildFlexibleArrayFn(
     const intermediate_type_ident = try Tag.identifier.create(c.arena, intermediate_type_name);
 
     const return_type_name = try block_scope.makeMangledName(c, "ReturnType");
-    const return_type = try Tag.std_meta_flexible_array_type.create(c.arena, .{ .lhs = self_type, .rhs = element_type });
+    const return_type = try Tag.helpers_flexible_array_type.create(c.arena, .{ .lhs = self_type, .rhs = element_type });
     const return_type_decl = try Tag.var_simple.create(c.arena, .{
         .name = return_type_name,
         .init = return_type,
@@ -1290,9 +1289,19 @@ fn transStmt(
             return maybeSuppressResult(c, scope, result_used, shuffle_vec_node);
         },
         // When adding new cases here, see comment for maybeBlockify()
-        else => {
+        .GCCAsmStmtClass,
-            return fail(c, error.UnsupportedTranslation, stmt.getBeginLoc(), "TODO implement translation of stmt class {s}", .{@tagName(sc)});
+        .GotoStmtClass,
-        },
+        .IndirectGotoStmtClass,
+        .AttributedStmtClass,
+        .AddrLabelExprClass,
+        .AtomicExprClass,
+        .BlockExprClass,
+        .UserDefinedLiteralClass,
+        .BuiltinBitCastExprClass,
+        .DesignatedInitExprClass,
+        .LabelStmtClass,
+        => return fail(c, error.UnsupportedTranslation, stmt.getBeginLoc(), "TODO implement translation of stmt class {s}", .{@tagName(sc)}),
+        else => return fail(c, error.UnsupportedTranslation, stmt.getBeginLoc(), "unsupported stmt class {s}", .{@tagName(sc)}),
     }
 }
 
@@ -1374,7 +1383,7 @@ fn makeShuffleMask(c: *Context, scope: *Scope, expr: *const clang.ShuffleVectorE
 
     for (init_list) |*init, i| {
         const index_expr = try transExprCoercing(c, scope, expr.getExpr(@intCast(c_uint, i + 2)), .used);
-        const converted_index = try Tag.std_meta_shuffle_vector_index.create(c.arena, .{ .lhs = index_expr, .rhs = vector_len });
+        const converted_index = try Tag.helpers_shuffle_vector_index.create(c.arena, .{ .lhs = index_expr, .rhs = vector_len });
         init.* = converted_index;
     }
 
@@ -1820,13 +1829,10 @@ fn transDeclStmtOne(
         .Function => {
             try visitFnDecl(c, @ptrCast(*const clang.FunctionDecl, decl));
         },
-        else => |kind| return fail(
+        else => {
-            c,
+            const decl_name = try c.str(decl.getDeclKindName());
-            error.UnsupportedTranslation,
+            try warn(c, &c.global_scope.base, decl.getLocation(), "ignoring {s} declaration", .{decl_name});
-            decl.getLocation(),
+        },
-            "TODO implement translation of DeclStmt kind {s}",
-            .{@tagName(kind)},
-        ),
     }
 }
 
@@ -1902,7 +1908,7 @@ fn transImplicitCastExpr(
             const ne = try Tag.not_equal.create(c.arena, .{ .lhs = ptr_to_int, .rhs = Tag.zero_literal.init() });
             return maybeSuppressResult(c, scope, result_used, ne);
         },
-        .IntegralToBoolean => {
+        .IntegralToBoolean, .FloatingToBoolean => {
             const sub_expr_node = try transExpr(c, scope, sub_expr, .used);
 
             // The expression is already a boolean one, return it as-is
@@ -1924,14 +1930,14 @@ fn transImplicitCastExpr(
             c,
             error.UnsupportedTranslation,
             @ptrCast(*const clang.Stmt, expr).getBeginLoc(),
-            "TODO implement translation of CastKind {s}",
+            "unsupported CastKind {s}",
             .{@tagName(kind)},
         ),
     }
 }
 
 fn isBuiltinDefined(name: []const u8) bool {
-    inline for (meta.declarations(c_builtins)) |decl| {
+    inline for (meta.declarations(std.zig.c_builtins)) |decl| {
         if (std.mem.eql(u8, name, decl.name)) return true;
     }
     return false;
@@ -2358,8 +2364,10 @@ fn transCCast(
         return Tag.float_to_int.create(c.arena, .{ .lhs = dst_node, .rhs = expr });
     }
     if (!cIsFloating(src_type) and cIsFloating(dst_type)) {
+        var rhs = expr;
+        if (qualTypeIsBoolean(src_type)) rhs = try Tag.bool_to_int.create(c.arena, expr);
         // @intToFloat(dest_type, val)
-        return Tag.int_to_float.create(c.arena, .{ .lhs = dst_node, .rhs = expr });
+        return Tag.int_to_float.create(c.arena, .{ .lhs = dst_node, .rhs = rhs });
     }
     if (qualTypeIsBoolean(src_type) and !qualTypeIsBoolean(dst_type)) {
         // @boolToInt returns either a comptime_int or a u1
@@ -2370,7 +2378,7 @@ fn transCCast(
     }
     if (cIsEnum(dst_type)) {
         // import("std").meta.cast(dest_type, val)
-        return Tag.std_meta_cast.create(c.arena, .{ .lhs = dst_node, .rhs = expr });
+        return Tag.helpers_cast.create(c.arena, .{ .lhs = dst_node, .rhs = expr });
     }
     if (cIsEnum(src_type) and !cIsEnum(dst_type)) {
         // @enumToInt(val)
@@ -4547,6 +4555,10 @@ fn transType(c: *Context, scope: *Scope, ty: *const clang.Type, source_loc: clan
                 .rhs = try transQualType(c, scope, element_qt, source_loc),
             });
         },
+        .ExtInt, .ExtVector => {
+            const type_name = c.str(ty.getTypeClassName());
+            return fail(c, error.UnsupportedType, source_loc, "TODO implement translation of type: '{s}'", .{type_name});
+        },
         else => {
             const type_name = c.str(ty.getTypeClassName());
             return fail(c, error.UnsupportedType, source_loc, "unsupported type: '{s}'", .{type_name});
@@ -4982,7 +4994,7 @@ fn transMacroFnDefine(c: *Context, m: *MacroCtx) ParseError!void {
         break :blk br.data.val;
     } else expr;
 
-    const return_type = if (typeof_arg.castTag(.std_meta_cast) orelse typeof_arg.castTag(.std_mem_zeroinit)) |some|
+    const return_type = if (typeof_arg.castTag(.helpers_cast) orelse typeof_arg.castTag(.std_mem_zeroinit)) |some|
         some.data.lhs
     else if (typeof_arg.castTag(.std_mem_zeroes)) |some|
         some.data
@@ -5095,7 +5107,7 @@ fn parseCNumLit(c: *Context, m: *MacroCtx) ParseError!Node {
             if (guaranteed_to_fit) {
                 return Tag.as.create(c.arena, .{ .lhs = type_node, .rhs = literal_node });
             } else {
-                return Tag.std_meta_promoteIntLiteral.create(c.arena, .{
+                return Tag.helpers_promoteIntLiteral.create(c.arena, .{
                     .type = type_node,
                     .value = literal_node,
                     .radix = try Tag.enum_literal.create(c.arena, radix),
@@ -5578,7 +5590,7 @@ fn parseCCastExpr(c: *Context, m: *MacroCtx, scope: *Scope) ParseError!Node {
                     return parseCPostfixExpr(c, m, scope, type_name);
                 }
                 const node_to_cast = try parseCCastExpr(c, m, scope);
-                return Tag.std_meta_cast.create(c.arena, .{ .lhs = type_name, .rhs = node_to_cast });
+                return Tag.helpers_cast.create(c.arena, .{ .lhs = type_name, .rhs = node_to_cast });
             }
         },
         else => {},
@@ -5925,7 +5937,7 @@ fn parseCUnaryExpr(c: *Context, m: *MacroCtx, scope: *Scope) ParseError!Node {
                 break :blk inner;
             } else try parseCUnaryExpr(c, m, scope);
 
-            return Tag.std_meta_sizeof.create(c.arena, operand);
+            return Tag.helpers_sizeof.create(c.arena, operand);
         },
         .Keyword_alignof => {
             // TODO this won't work if using <stdalign.h>'s

src/translate_c/ast.zig

@@ -74,7 +74,7 @@ pub const Node = extern union {
         tuple,
         container_init,
         container_init_dot,
-        std_meta_cast,
+        helpers_cast,
         /// _ = operand;
         discard,
 
@@ -124,8 +124,8 @@ pub const Node = extern union {
         std_math_Log2Int,
         /// @intCast(lhs, rhs)
         int_cast,
-        /// @import("std").meta.promoteIntLiteral(value, type, radix)
+        /// @import("std").zig.c_translation.promoteIntLiteral(value, type, radix)
-        std_meta_promoteIntLiteral,
+        helpers_promoteIntLiteral,
         /// @import("std").meta.alignment(value)
         std_meta_alignment,
         /// @rem(lhs, rhs)
@@ -193,12 +193,12 @@ pub const Node = extern union {
         array_type,
         null_sentinel_array_type,
 
-        /// @import("std").meta.sizeof(operand)
+        /// @import("std").zig.c_translation.sizeof(operand)
-        std_meta_sizeof,
+        helpers_sizeof,
-        /// @import("std").meta.FlexibleArrayType(lhs, rhs)
+        /// @import("std").zig.c_translation.FlexibleArrayType(lhs, rhs)
-        std_meta_flexible_array_type,
+        helpers_flexible_array_type,
-        /// @import("std").meta.shuffleVectorIndex(lhs, rhs)
+        /// @import("std").zig.c_translation.shuffleVectorIndex(lhs, rhs)
-        std_meta_shuffle_vector_index,
+        helpers_shuffle_vector_index,
         /// @import("std").meta.Vector(lhs, rhs)
         std_meta_vector,
         /// @import("std").mem.zeroes(operand)
@@ -272,7 +272,7 @@ pub const Node = extern union {
                 .if_not_break,
                 .switch_else,
                 .block_single,
-                .std_meta_sizeof,
+                .helpers_sizeof,
                 .std_meta_alignment,
                 .bool_to_int,
                 .sizeof,
@@ -332,13 +332,13 @@ pub const Node = extern union {
                 .align_cast,
                 .array_access,
                 .std_mem_zeroinit,
-                .std_meta_flexible_array_type,
+                .helpers_flexible_array_type,
-                .std_meta_shuffle_vector_index,
+                .helpers_shuffle_vector_index,
                 .std_meta_vector,
                 .ptr_cast,
                 .div_exact,
                 .offset_of,
-                .std_meta_cast,
+                .helpers_cast,
                 => Payload.BinOp,
 
                 .integer_literal,
@@ -362,7 +362,7 @@ pub const Node = extern union {
                 .tuple => Payload.TupleInit,
                 .container_init => Payload.ContainerInit,
                 .container_init_dot => Payload.ContainerInitDot,
-                .std_meta_promoteIntLiteral => Payload.PromoteIntLiteral,
+                .helpers_promoteIntLiteral => Payload.PromoteIntLiteral,
                 .block => Payload.Block,
                 .c_pointer, .single_pointer => Payload.Pointer,
                 .array_type, .null_sentinel_array_type => Payload.Array,
@@ -868,7 +868,7 @@ fn renderNode(c: *Context, node: Node) Allocator.Error!NodeIndex {
             // pub usingnamespace @import("std").c.builtins;
             _ = try c.addToken(.keyword_pub, "pub");
             const usingnamespace_token = try c.addToken(.keyword_usingnamespace, "usingnamespace");
-            const import_node = try renderStdImport(c, "c", "builtins");
+            const import_node = try renderStdImport(c, &.{ "zig", "c_builtins" });
             _ = try c.addToken(.semicolon, ";");
 
             return c.addNode(.{
@@ -882,52 +882,52 @@ fn renderNode(c: *Context, node: Node) Allocator.Error!NodeIndex {
         },
         .std_math_Log2Int => {
             const payload = node.castTag(.std_math_Log2Int).?.data;
-            const import_node = try renderStdImport(c, "math", "Log2Int");
+            const import_node = try renderStdImport(c, &.{ "math", "Log2Int" });
             return renderCall(c, import_node, &.{payload});
         },
-        .std_meta_cast => {
+        .helpers_cast => {
-            const payload = node.castTag(.std_meta_cast).?.data;
+            const payload = node.castTag(.helpers_cast).?.data;
-            const import_node = try renderStdImport(c, "meta", "cast");
+            const import_node = try renderStdImport(c, &.{ "zig", "c_translation", "cast" });
             return renderCall(c, import_node, &.{ payload.lhs, payload.rhs });
         },
-        .std_meta_promoteIntLiteral => {
+        .helpers_promoteIntLiteral => {
-            const payload = node.castTag(.std_meta_promoteIntLiteral).?.data;
+            const payload = node.castTag(.helpers_promoteIntLiteral).?.data;
-            const import_node = try renderStdImport(c, "meta", "promoteIntLiteral");
+            const import_node = try renderStdImport(c, &.{ "zig", "c_translation", "promoteIntLiteral" });
             return renderCall(c, import_node, &.{ payload.type, payload.value, payload.radix });
         },
         .std_meta_alignment => {
             const payload = node.castTag(.std_meta_alignment).?.data;
-            const import_node = try renderStdImport(c, "meta", "alignment");
+            const import_node = try renderStdImport(c, &.{ "meta", "alignment" });
             return renderCall(c, import_node, &.{payload});
         },
-        .std_meta_sizeof => {
+        .helpers_sizeof => {
-            const payload = node.castTag(.std_meta_sizeof).?.data;
+            const payload = node.castTag(.helpers_sizeof).?.data;
-            const import_node = try renderStdImport(c, "meta", "sizeof");
+            const import_node = try renderStdImport(c, &.{ "zig", "c_translation", "sizeof" });
             return renderCall(c, import_node, &.{payload});
         },
         .std_mem_zeroes => {
             const payload = node.castTag(.std_mem_zeroes).?.data;
-            const import_node = try renderStdImport(c, "mem", "zeroes");
+            const import_node = try renderStdImport(c, &.{ "mem", "zeroes" });
             return renderCall(c, import_node, &.{payload});
         },
         .std_mem_zeroinit => {
             const payload = node.castTag(.std_mem_zeroinit).?.data;
-            const import_node = try renderStdImport(c, "mem", "zeroInit");
+            const import_node = try renderStdImport(c, &.{ "mem", "zeroInit" });
             return renderCall(c, import_node, &.{ payload.lhs, payload.rhs });
         },
-        .std_meta_flexible_array_type => {
+        .helpers_flexible_array_type => {
-            const payload = node.castTag(.std_meta_flexible_array_type).?.data;
+            const payload = node.castTag(.helpers_flexible_array_type).?.data;
-            const import_node = try renderStdImport(c, "meta", "FlexibleArrayType");
+            const import_node = try renderStdImport(c, &.{ "zig", "c_translation", "FlexibleArrayType" });
             return renderCall(c, import_node, &.{ payload.lhs, payload.rhs });
         },
-        .std_meta_shuffle_vector_index => {
+        .helpers_shuffle_vector_index => {
-            const payload = node.castTag(.std_meta_shuffle_vector_index).?.data;
+            const payload = node.castTag(.helpers_shuffle_vector_index).?.data;
-            const import_node = try renderStdImport(c, "meta", "shuffleVectorIndex");
+            const import_node = try renderStdImport(c, &.{ "zig", "c_translation", "shuffleVectorIndex" });
             return renderCall(c, import_node, &.{ payload.lhs, payload.rhs });
         },
         .std_meta_vector => {
             const payload = node.castTag(.std_meta_vector).?.data;
-            const import_node = try renderStdImport(c, "meta", "Vector");
+            const import_node = try renderStdImport(c, &.{ "meta", "Vector" });
             return renderCall(c, import_node, &.{ payload.lhs, payload.rhs });
         },
         .call => {
@@ -2269,13 +2269,13 @@ fn renderNodeGrouped(c: *Context, node: Node) !NodeIndex {
         .alignof,
         .typeof,
         .typeinfo,
-        .std_meta_sizeof,
         .std_meta_alignment,
-        .std_meta_cast,
-        .std_meta_promoteIntLiteral,
         .std_meta_vector,
-        .std_meta_shuffle_vector_index,
+        .helpers_sizeof,
-        .std_meta_flexible_array_type,
+        .helpers_cast,
+        .helpers_promoteIntLiteral,
+        .helpers_shuffle_vector_index,
+        .helpers_flexible_array_type,
         .std_mem_zeroinit,
         .integer_literal,
         .float_literal,
@@ -2442,7 +2442,7 @@ fn renderBinOp(c: *Context, node: Node, tag: std.zig.ast.Node.Tag, tok_tag: Toke
     });
 }
 
-fn renderStdImport(c: *Context, first: []const u8, second: []const u8) !NodeIndex {
+fn renderStdImport(c: *Context, parts: []const []const u8) !NodeIndex {
     const import_tok = try c.addToken(.builtin, "@import");
     _ = try c.addToken(.l_paren, "(");
     const std_tok = try c.addToken(.string_literal, "\"std\"");
@@ -2463,8 +2463,9 @@ fn renderStdImport(c: *Context, first: []const u8, second: []const u8) !NodeInde
     });
 
     var access_chain = import_node;
-    access_chain = try renderFieldAccess(c, access_chain, first);
+    for (parts) |part| {
-    access_chain = try renderFieldAccess(c, access_chain, second);
+        access_chain = try renderFieldAccess(c, access_chain, part);
+    }
     return access_chain;
 }
 

test/translate_c.zig

@@ -133,7 +133,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
             \\    const A = @enumToInt(enum_Foo.A);
             \\    const B = @enumToInt(enum_Foo.B);
             \\    const C = @enumToInt(enum_Foo.C);
-            \\    var a: enum_Foo = @import("std").meta.cast(enum_Foo, B);
+            \\    var a: enum_Foo = @import("std").zig.c_translation.cast(enum_Foo, B);
             \\    {
             \\        const enum_Foo = extern enum(
         ++ default_enum_type ++
@@ -146,7 +146,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
             \\        const A_2 = @enumToInt(enum_Foo.A);
             \\        const B_3 = @enumToInt(enum_Foo.B);
             \\        const C_4 = @enumToInt(enum_Foo.C);
-            \\        var a_5: enum_Foo = @import("std").meta.cast(enum_Foo, B_3);
+            \\        var a_5: enum_Foo = @import("std").zig.c_translation.cast(enum_Foo, B_3);
             \\    }
             \\}
     });
@@ -242,7 +242,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\#define MEM_PHYSICAL_TO_K0(x) (void*)((uint32_t)(x) + SYS_BASE_CACHED)
     , &[_][]const u8{
         \\pub inline fn MEM_PHYSICAL_TO_K0(x: anytype) ?*c_void {
-        \\    return @import("std").meta.cast(?*c_void, @import("std").meta.cast(u32, x) + SYS_BASE_CACHED);
+        \\    return @import("std").zig.c_translation.cast(?*c_void, @import("std").zig.c_translation.cast(u32, x) + SYS_BASE_CACHED);
         \\}
     });
 
@@ -282,8 +282,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         ,
         \\pub const VALUE = ((((@as(c_int, 1) + (@as(c_int, 2) * @as(c_int, 3))) + (@as(c_int, 4) * @as(c_int, 5))) + @as(c_int, 6)) << @as(c_int, 7)) | @boolToInt(@as(c_int, 8) == @as(c_int, 9));
         ,
-        \\pub inline fn _AL_READ3BYTES(p: anytype) @TypeOf((@import("std").meta.cast([*c]u8, p).* | ((@import("std").meta.cast([*c]u8, p) + @as(c_int, 1)).* << @as(c_int, 8))) | ((@import("std").meta.cast([*c]u8, p) + @as(c_int, 2)).* << @as(c_int, 16))) {
+        \\pub inline fn _AL_READ3BYTES(p: anytype) @TypeOf((@import("std").zig.c_translation.cast([*c]u8, p).* | ((@import("std").zig.c_translation.cast([*c]u8, p) + @as(c_int, 1)).* << @as(c_int, 8))) | ((@import("std").zig.c_translation.cast([*c]u8, p) + @as(c_int, 2)).* << @as(c_int, 16))) {
-        \\    return (@import("std").meta.cast([*c]u8, p).* | ((@import("std").meta.cast([*c]u8, p) + @as(c_int, 1)).* << @as(c_int, 8))) | ((@import("std").meta.cast([*c]u8, p) + @as(c_int, 2)).* << @as(c_int, 16));
+        \\    return (@import("std").zig.c_translation.cast([*c]u8, p).* | ((@import("std").zig.c_translation.cast([*c]u8, p) + @as(c_int, 1)).* << @as(c_int, 8))) | ((@import("std").zig.c_translation.cast([*c]u8, p) + @as(c_int, 2)).* << @as(c_int, 16));
         \\}
     });
 
@@ -438,17 +438,17 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
     , &[_][]const u8{
         \\pub const struct_foo = extern struct {
         \\    x: c_int align(4),
-        \\    pub fn y(self: anytype) @import("std").meta.FlexibleArrayType(@TypeOf(self), c_int) {
+        \\    pub fn y(self: anytype) @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int) {
-        \\        const Intermediate = @import("std").meta.FlexibleArrayType(@TypeOf(self), u8);
+        \\        const Intermediate = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), u8);
-        \\        const ReturnType = @import("std").meta.FlexibleArrayType(@TypeOf(self), c_int);
+        \\        const ReturnType = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int);
         \\        return @ptrCast(ReturnType, @alignCast(@alignOf(c_int), @ptrCast(Intermediate, self) + 4));
         \\    }
         \\};
         \\pub const struct_bar = extern struct {
         \\    x: c_int align(4),
-        \\    pub fn y(self: anytype) @import("std").meta.FlexibleArrayType(@TypeOf(self), c_int) {
+        \\    pub fn y(self: anytype) @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int) {
-        \\        const Intermediate = @import("std").meta.FlexibleArrayType(@TypeOf(self), u8);
+        \\        const Intermediate = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), u8);
-        \\        const ReturnType = @import("std").meta.FlexibleArrayType(@TypeOf(self), c_int);
+        \\        const ReturnType = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int);
         \\        return @ptrCast(ReturnType, @alignCast(@alignOf(c_int), @ptrCast(Intermediate, self) + 4));
         \\    }
         \\};
@@ -583,7 +583,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
     cases.add("#define hex literal with capital X",
         \\#define VAL 0XF00D
     , &[_][]const u8{
-        \\pub const VAL = @import("std").meta.promoteIntLiteral(c_int, 0xF00D, .hexadecimal);
+        \\pub const VAL = @import("std").zig.c_translation.promoteIntLiteral(c_int, 0xF00D, .hexadecimal);
     });
 
     cases.add("anonymous struct & unions",
@@ -1738,7 +1738,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
             \\pub const e = @enumToInt(enum_unnamed_1.e);
             \\pub const f = @enumToInt(enum_unnamed_1.f);
             \\pub const g = @enumToInt(enum_unnamed_1.g);
-            \\pub export var h: enum_unnamed_1 = @import("std").meta.cast(enum_unnamed_1, e);
+            \\pub export var h: enum_unnamed_1 = @import("std").zig.c_translation.cast(enum_unnamed_1, e);
             \\const enum_unnamed_2 = extern enum(
         ++ default_enum_type ++
             \\) {
@@ -1882,7 +1882,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\typedef struct { int dummy; } NRF_GPIO_Type;
         \\#define NRF_GPIO ((NRF_GPIO_Type *) NRF_GPIO_BASE)
     , &[_][]const u8{
-        \\pub const NRF_GPIO = @import("std").meta.cast([*c]NRF_GPIO_Type, NRF_GPIO_BASE);
+        \\pub const NRF_GPIO = @import("std").zig.c_translation.cast([*c]NRF_GPIO_Type, NRF_GPIO_BASE);
     });
 
     cases.add("basic macro function",
@@ -2379,7 +2379,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
             \\    var a = arg_a;
             \\    var b = arg_b;
             \\    var c = arg_c;
-            \\    var d: enum_Foo = @import("std").meta.cast(enum_Foo, FooA);
+            \\    var d: enum_Foo = @import("std").zig.c_translation.cast(enum_Foo, FooA);
             \\    var e: c_int = @boolToInt((a != 0) and (b != 0));
             \\    var f: c_int = @boolToInt((b != 0) and (c != null));
             \\    var g: c_int = @boolToInt((a != 0) and (c != null));
@@ -3182,13 +3182,13 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\#define BAR (void*) a
         \\#define BAZ (uint32_t)(2)
     , &[_][]const u8{
-        \\pub inline fn FOO(bar: anytype) @TypeOf(baz(@import("std").meta.cast(?*c_void, baz))) {
+        \\pub inline fn FOO(bar: anytype) @TypeOf(baz(@import("std").zig.c_translation.cast(?*c_void, baz))) {
-        \\    return baz(@import("std").meta.cast(?*c_void, baz));
+        \\    return baz(@import("std").zig.c_translation.cast(?*c_void, baz));
         \\}
         ,
-        \\pub const BAR = @import("std").meta.cast(?*c_void, a);
+        \\pub const BAR = @import("std").zig.c_translation.cast(?*c_void, a);
         ,
-        \\pub const BAZ = @import("std").meta.cast(u32, @as(c_int, 2));
+        \\pub const BAZ = @import("std").zig.c_translation.cast(u32, @as(c_int, 2));
     });
 
     cases.add("macro with cast to unsigned short, long, and long long",
@@ -3196,9 +3196,9 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\#define CURLAUTH_BASIC ((unsigned long) 1)
         \\#define CURLAUTH_BASIC_BUT_ULONGLONG ((unsigned long long) 1)
     , &[_][]const u8{
-        \\pub const CURLAUTH_BASIC_BUT_USHORT = @import("std").meta.cast(c_ushort, @as(c_int, 1));
+        \\pub const CURLAUTH_BASIC_BUT_USHORT = @import("std").zig.c_translation.cast(c_ushort, @as(c_int, 1));
-        \\pub const CURLAUTH_BASIC = @import("std").meta.cast(c_ulong, @as(c_int, 1));
+        \\pub const CURLAUTH_BASIC = @import("std").zig.c_translation.cast(c_ulong, @as(c_int, 1));
-        \\pub const CURLAUTH_BASIC_BUT_ULONGLONG = @import("std").meta.cast(c_ulonglong, @as(c_int, 1));
+        \\pub const CURLAUTH_BASIC_BUT_ULONGLONG = @import("std").zig.c_translation.cast(c_ulonglong, @as(c_int, 1));
     });
 
     cases.add("macro conditional operator",
@@ -3413,8 +3413,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\#define DefaultScreen(dpy) (((_XPrivDisplay)(dpy))->default_screen)
         \\
     , &[_][]const u8{
-        \\pub inline fn DefaultScreen(dpy: anytype) @TypeOf(@import("std").meta.cast(_XPrivDisplay, dpy).*.default_screen) {
+        \\pub inline fn DefaultScreen(dpy: anytype) @TypeOf(@import("std").zig.c_translation.cast(_XPrivDisplay, dpy).*.default_screen) {
-        \\    return @import("std").meta.cast(_XPrivDisplay, dpy).*.default_screen;
+        \\    return @import("std").zig.c_translation.cast(_XPrivDisplay, dpy).*.default_screen;
         \\}
     });
 
@@ -3422,9 +3422,9 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\#define NULL ((void*)0)
         \\#define FOO ((int)0x8000)
     , &[_][]const u8{
-        \\pub const NULL = @import("std").meta.cast(?*c_void, @as(c_int, 0));
+        \\pub const NULL = @import("std").zig.c_translation.cast(?*c_void, @as(c_int, 0));
         ,
-        \\pub const FOO = @import("std").meta.cast(c_int, @import("std").meta.promoteIntLiteral(c_int, 0x8000, .hexadecimal));
+        \\pub const FOO = @import("std").zig.c_translation.cast(c_int, @import("std").zig.c_translation.promoteIntLiteral(c_int, 0x8000, .hexadecimal));
     });
 
     if (std.Target.current.abi == .msvc) {
@@ -3503,11 +3503,11 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\pub const GUARANTEED_TO_FIT_1 = @as(c_int, 1024);
         \\pub const GUARANTEED_TO_FIT_2 = @as(c_long, 10241024);
         \\pub const GUARANTEED_TO_FIT_3 = @as(c_ulong, 20482048);
-        \\pub const MAY_NEED_PROMOTION_1 = @import("std").meta.promoteIntLiteral(c_int, 10241024, .decimal);
+        \\pub const MAY_NEED_PROMOTION_1 = @import("std").zig.c_translation.promoteIntLiteral(c_int, 10241024, .decimal);
-        \\pub const MAY_NEED_PROMOTION_2 = @import("std").meta.promoteIntLiteral(c_long, 307230723072, .decimal);
+        \\pub const MAY_NEED_PROMOTION_2 = @import("std").zig.c_translation.promoteIntLiteral(c_long, 307230723072, .decimal);
-        \\pub const MAY_NEED_PROMOTION_3 = @import("std").meta.promoteIntLiteral(c_ulong, 819281928192, .decimal);
+        \\pub const MAY_NEED_PROMOTION_3 = @import("std").zig.c_translation.promoteIntLiteral(c_ulong, 819281928192, .decimal);
-        \\pub const MAY_NEED_PROMOTION_HEX = @import("std").meta.promoteIntLiteral(c_int, 0x80000000, .hexadecimal);
+        \\pub const MAY_NEED_PROMOTION_HEX = @import("std").zig.c_translation.promoteIntLiteral(c_int, 0x80000000, .hexadecimal);
-        \\pub const MAY_NEED_PROMOTION_OCT = @import("std").meta.promoteIntLiteral(c_int, 0o20000000000, .octal);
+        \\pub const MAY_NEED_PROMOTION_OCT = @import("std").zig.c_translation.promoteIntLiteral(c_int, 0o20000000000, .octal);
     });
 
     // See __builtin_alloca_with_align comment in std.c.builtins
@@ -3642,7 +3642,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
         \\typedef long long LONG_PTR;
         \\#define INVALID_HANDLE_VALUE ((void *)(LONG_PTR)-1)
     , &[_][]const u8{
-        \\pub const MAP_FAILED = @import("std").meta.cast(?*c_void, -@as(c_int, 1));
+        \\pub const MAP_FAILED = @import("std").zig.c_translation.cast(?*c_void, -@as(c_int, 1));
-        \\pub const INVALID_HANDLE_VALUE = @import("std").meta.cast(?*c_void, @import("std").meta.cast(LONG_PTR, -@as(c_int, 1)));
+        \\pub const INVALID_HANDLE_VALUE = @import("std").zig.c_translation.cast(?*c_void, @import("std").zig.c_translation.cast(LONG_PTR, -@as(c_int, 1)));
     });
 }