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30f2bb8464
When we're compiling compiler_rt for any WebAssembly target, we do not want to expose all the compiler-rt functions to the host runtime. By setting the visibility of all exports to `hidden`, we allow the linker to resolve the symbols during linktime, while not expose the functions to the host runtime. This also means the linker can properly garbage collect any compiler-rt function that does not get resolved. The symbol visibility for all target remains the same as before: `default`.
31 lines
873 B
Zig
31 lines
873 B
Zig
const std = @import("std");
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const common = @import("./common.zig");
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comptime {
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@export(bcmp, .{ .name = "bcmp", .linkage = common.linkage, .visibility = common.visibility });
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}
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pub fn bcmp(vl: [*]allowzero const u8, vr: [*]allowzero const u8, n: usize) callconv(.C) c_int {
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@setRuntimeSafety(false);
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var index: usize = 0;
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while (index != n) : (index += 1) {
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if (vl[index] != vr[index]) {
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return 1;
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}
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}
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return 0;
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}
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test "bcmp" {
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const base_arr = &[_]u8{ 1, 1, 1 };
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const arr1 = &[_]u8{ 1, 1, 1 };
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const arr2 = &[_]u8{ 1, 0, 1 };
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const arr3 = &[_]u8{ 1, 2, 1 };
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try std.testing.expect(bcmp(base_arr[0..], arr1[0..], base_arr.len) == 0);
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try std.testing.expect(bcmp(base_arr[0..], arr2[0..], base_arr.len) != 0);
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try std.testing.expect(bcmp(base_arr[0..], arr3[0..], base_arr.len) != 0);
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}
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