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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`.
26 lines
637 B
Zig
26 lines
637 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(memmove, .{ .name = "memmove", .linkage = common.linkage, .visibility = common.visibility });
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}
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pub fn memmove(dest: ?[*]u8, src: ?[*]const u8, n: usize) callconv(.C) ?[*]u8 {
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@setRuntimeSafety(false);
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if (@ptrToInt(dest) < @ptrToInt(src)) {
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var index: usize = 0;
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while (index != n) : (index += 1) {
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dest.?[index] = src.?[index];
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}
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} else {
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var index = n;
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while (index != 0) {
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index -= 1;
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dest.?[index] = src.?[index];
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}
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}
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return dest;
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}
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