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compiler: support file-level //go:linkname directives

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Modern golang.org/x/sys/unix (v0.36+) declares its linknames
detached from function declarations, e.g.:

    func syscall_syscall(...)
    //go:linkname syscall_syscall syscall.syscall

TinyGo's pragma parser only inspected function doc comments and
therefore missed these, producing link errors like:

    undefined symbol: _golang.org/x/sys/unix.syscall_syscall

Extend parsePragmas to also walk the enclosing *ast.File's
free-standing comments for //go:linkname directives matching the
function's name. Function-attached directives still take
precedence. The existing 'unsafe' import gate is preserved.

Fixes #4395, #5365
This commit is contained in:
Evan Wies
2026-05-14 18:42:02 -04:00
committed by Ron Evans
parent c1a4ed1489
commit 35a61ac8c5
4 changed files with 124 additions and 1 deletions
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compiler/testdata/pragma.ll
Vendored
+20
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@@ -102,6 +102,26 @@ entry:
; Function Attrs: allockind("alloc,zeroed") allocsize(0)
declare noalias nonnull ptr @runtime.alloc_noheap(i32, ptr, ptr) #9
; Function Attrs: nounwind
define hidden void @somepkg.someFileLevelFunction1(ptr %context) unnamed_addr #1 {
entry:
ret void
}
declare void @somepkg.someFileLevelFunction2(ptr) #0
; Function Attrs: nounwind
define hidden void @somepkg.someAdjacentFunction(ptr %context) unnamed_addr #1 {
entry:
ret void
}
; Function Attrs: nounwind
define hidden void @main.sentinelAfterAdjacentLinkname(ptr %context) unnamed_addr #1 {
entry:
ret void
}
attributes #0 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
attributes #1 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "wasm-export-name"="extern_func" }