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Updated Self Hosted Compiler Upgrade Guide (markdown)

Andrew Kelley 2022-08-19 22:01:59 -04:00
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Self-Hosted-Compiler-Upgrade-Guide.md

@ -200,7 +200,7 @@ const S = struct {
This test passes with stage1 despite having a critical bug: a temporary is created by taking the address of the the [pass-by-value parameter](https://ziglang.org/documentation/master/#Pass-by-value-Parameters) which is then returned from the function.
Meanwhile, the self-hosted compiler efficiently takes advantage of smaller arguments such as this, passing them truly by value, revealing the bug.
Stage1 is naive, always passing structs by pointer in code such as this. Meanwhile, the self-hosted compiler efficiently takes advantage of smaller arguments such as this, passing them truly by value, revealing the bug.
Hopefully in the future Zig will have [runtime safety for this](https://github.com/ziglang/zig/issues/3180), however, currently this will manifest as a use-after-free. So if you find a pointer to bogus data, double check that the pointer was not created this way.