34489eb2af
The current implementation of Gogo::pkgpath_for_symbol was written in
a way that allowed two distinct package paths to map to the same
symbol, which could cause collisions at link- time or compile-time.
Switch to a better mangling scheme to insure that we get a unique
packagepath symbol for each package. In the new scheme instead of having
separate mangling schemes for identifiers and package paths, the
main identifier mangler ("go_encode_id") now handles mangling of
both packagepath characters and identifier characters.
The new mangling scheme is more intrusive: "foo/bar.Baz" is mangled as
"foo..z2fbar.Baz" instead of "foo_bar.Baz". To mitigate this, this
patch also adds a demangling capability so that function names
returned from runtime.CallersFrames are converted back to their
original unmangled form.
Changing the pkgpath_for_symbol scheme requires updating a number of
//go:linkname directives and C "__asm__" directives to match the new
scheme, as well as updating the 'gotest' driver (which makes
assumptions about the correct mapping from pkgpath symbol to package
name).
Fixes golang/go#27534.
Reviewed-on: https://go-review.googlesource.com/c/135455
From-SVN: r265510
30 lines
653 B
Go
30 lines
653 B
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import (
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_ "unsafe"
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)
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//go:linkname runtime_ignoreHangup internal..z2fpoll.runtime_ignoreHangup
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func runtime_ignoreHangup() {
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getg().m.ignoreHangup = true
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}
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//go:linkname runtime_unignoreHangup internal..z2fpoll.runtime_unignoreHangup
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func runtime_unignoreHangup(sig string) {
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getg().m.ignoreHangup = false
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}
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func ignoredNote(note *byte) bool {
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if note == nil {
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return false
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}
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if gostringnocopy(note) != "hangup" {
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return false
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}
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return getg().m.ignoreHangup
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}
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