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`.
29 lines
663 B
Zig
29 lines
663 B
Zig
const std = @import("std");
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const common = @import("./common.zig");
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const builtin = @import("builtin");
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comptime {
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if (builtin.object_format != .c) {
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@export(memcpy, .{ .name = "memcpy", .linkage = common.linkage, .visibility = common.visibility });
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}
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}
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pub fn memcpy(noalias dest: ?[*]u8, noalias src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
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@setRuntimeSafety(false);
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if (len != 0) {
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var d = dest.?;
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var s = src.?;
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var n = len;
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while (true) {
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d[0] = s[0];
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n -= 1;
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if (n == 0) break;
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d += 1;
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s += 1;
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}
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}
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return dest;
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}
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