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
28 lines
790 B
Go
28 lines
790 B
Go
// Copyright 2014 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 _ "unsafe" // for go:linkname
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// Define maxstacksize here for gccgo. For gc it is defined in
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// stack.go, but gccgo doesn't use that file. Or, for that matter,
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// maxstacksize.
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var maxstacksize uintptr = 1 << 20 // enough until runtime.main sets it for real
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//go:linkname setMaxStack runtime..z2fdebug.setMaxStack
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func setMaxStack(in int) (out int) {
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out = int(maxstacksize)
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maxstacksize = uintptr(in)
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return out
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}
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//go:linkname setPanicOnFault runtime..z2fdebug.setPanicOnFault
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func setPanicOnFault(new bool) (old bool) {
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_g_ := getg()
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old = _g_.paniconfault
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_g_.paniconfault = new
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return old
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}
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