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compiler-rt: move strlen from libzigc to here

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LLVM 21 has started recognizing strlen-like idioms and optimizing them to strlen
calls, so we need this function provided in compiler-rt for libc-less
compilations.
This commit is contained in:
Alex Rønne Petersen 2025-07-16 18:33:15 +02:00
parent dfa55e193d
commit e9ac2ce116
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3 changed files with 12 additions and 5 deletions
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5
lib/c/string.zig
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@ -4,7 +4,6 @@ const common = @import("common.zig");
comptime { comptime {
@export(&strcmp, .{ .name = "strcmp", .linkage = common.linkage, .visibility = common.visibility }); @export(&strcmp, .{ .name = "strcmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&strlen, .{ .name = "strlen", .linkage = common.linkage, .visibility = common.visibility });
@export(&strncmp, .{ .name = "strncmp", .linkage = common.linkage, .visibility = common.visibility }); @export(&strncmp, .{ .name = "strncmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&strcasecmp, .{ .name = "strcasecmp", .linkage = common.linkage, .visibility = common.visibility }); @export(&strcasecmp, .{ .name = "strcasecmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&strncasecmp, .{ .name = "strncasecmp", .linkage = common.linkage, .visibility = common.visibility }); @export(&strncasecmp, .{ .name = "strncasecmp", .linkage = common.linkage, .visibility = common.visibility });
@ -103,7 +102,3 @@ test strncmp {
try std.testing.expect(strncmp(@ptrCast("b"), @ptrCast("a"), 1) > 0); try std.testing.expect(strncmp(@ptrCast("b"), @ptrCast("a"), 1) > 0);
try std.testing.expect(strncmp(@ptrCast("\xff"), @ptrCast("\x02"), 1) > 0); try std.testing.expect(strncmp(@ptrCast("\xff"), @ptrCast("\x02"), 1) > 0);
} }
fn strlen(s: [*:0]const c_char) callconv(.c) usize {
return std.mem.len(s);
}

2
lib/compiler_rt.zig
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@ -263,6 +263,8 @@ comptime {
_ = @import("compiler_rt/memcmp.zig"); _ = @import("compiler_rt/memcmp.zig");
_ = @import("compiler_rt/bcmp.zig"); _ = @import("compiler_rt/bcmp.zig");
_ = @import("compiler_rt/ssp.zig"); _ = @import("compiler_rt/ssp.zig");
_ = @import("compiler_rt/strlen.zig");
} }
// Temporarily used for uefi until https://github.com/ziglang/zig/issues/21630 is addressed. // Temporarily used for uefi until https://github.com/ziglang/zig/issues/21630 is addressed.

10
lib/compiler_rt/strlen.zig Normal file
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@ -0,0 +1,10 @@
const std = @import("std");
const common = @import("common.zig");
comptime {
@export(&strlen, .{ .name = "strlen", .linkage = common.linkage, .visibility = common.visibility });
}
fn strlen(s: [*:0]const c_char) callconv(.c) usize {
return std.mem.len(s);
}