c70ff9f9be
The gc compiler has started permitting go:linkname comments with a
single argument to mean that a function should be externally visible
outside the package. Implement this in the Go frontend.
Change the libgo runtime package to use it, rather than repeating the
name just to export a function.
Remove a couple of unnecessary go:linkname comments on declarations.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/192197
From-SVN: r275239
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// Copyright 2009 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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"runtime/internal/atomic"
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_ "unsafe" // for go:linkname
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)
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//go:generate go run wincallback.go
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//go:generate go run mkduff.go
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//go:generate go run mkfastlog2table.go
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// For gccgo, while we still have C runtime code, use go:linkname to
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// export some functions.
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//
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//go:linkname tickspersecond
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var ticksLock mutex
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var ticksVal uint64
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// Note: Called by runtime/pprof in addition to runtime code.
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func tickspersecond() int64 {
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r := int64(atomic.Load64(&ticksVal))
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if r != 0 {
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return r
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}
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lock(&ticksLock)
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r = int64(ticksVal)
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if r == 0 {
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t0 := nanotime()
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c0 := cputicks()
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usleep(100 * 1000)
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t1 := nanotime()
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c1 := cputicks()
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if t1 == t0 {
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t1++
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}
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r = (c1 - c0) * 1000 * 1000 * 1000 / (t1 - t0)
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if r == 0 {
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r++
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}
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atomic.Store64(&ticksVal, uint64(r))
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}
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unlock(&ticksLock)
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return r
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}
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var envs []string
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var argslice []string
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//go:linkname syscall_runtime_envs syscall.runtime_envs
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func syscall_runtime_envs() []string { return append([]string{}, envs...) }
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//go:linkname syscall_Getpagesize syscall.Getpagesize
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func syscall_Getpagesize() int { return int(physPageSize) }
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//go:linkname os_runtime_args os.runtime_args
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func os_runtime_args() []string { return append([]string{}, argslice...) }
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//go:linkname syscall_Exit syscall.Exit
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//go:nosplit
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func syscall_Exit(code int) {
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exit(int32(code))
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}
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// Temporary, for the gccgo runtime code written in C.
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//go:linkname get_envs runtime_get_envs
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func get_envs() []string { return envs }
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//go:linkname get_args runtime_get_args
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func get_args() []string { return argslice }
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