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https://github.com/golang/go
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193daab988
In linker, refuse to write conservative (array of pointers) as the garbage collection type for any variable in the data/bss GC program. In the linker, attach the Go type to an already-read C declaration during dedup. This gives us Go types for C globals for free as long as the cmd/dist-generated Go code contains the declaration. (Most runtime C declarations have a corresponding Go declaration. Both are bss declarations and so the linker dedups them.) In cmd/dist, add a few more C files to the auto-Go-declaration list in order to get Go type information for the C declarations into the linker. In C compiler, mark all non-pointer-containing global declarations and all string data as NOPTR. This allows them to exist in C files without any corresponding Go declaration. Count C function pointers as "non-pointer-containing", since we have no heap-allocated C functions. In runtime, add NOPTR to the remaining pointer-containing declarations, none of which refer to Go heap objects. In runtime, also move os.Args and syscall.envs data into runtime-owned variables. Otherwise, in programs that do not import os or syscall, the runtime variables named os.Args and syscall.envs will be missing type information. I believe that this CL eliminates the final source of conservative GC scanning in non-SWIG Go programs, and therefore... Fixes #909. LGTM=iant R=iant CC=golang-codereviews https://golang.org/cl/149770043
61 lines
1.2 KiB
Go
61 lines
1.2 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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var ticks struct {
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lock mutex
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val uint64
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}
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var tls0 [8]uintptr // available storage for m0's TLS; not necessarily used; opaque to GC
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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(atomicload64(&ticks.val))
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if r != 0 {
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return r
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}
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lock(&ticks.lock)
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r = int64(ticks.val)
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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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atomicstore64(&ticks.val, uint64(r))
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}
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unlock(&ticks.lock)
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return r
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}
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func makeStringSlice(n int) []string {
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return make([]string, n)
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}
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// TODO: Move to parfor.go when parfor.c becomes parfor.go.
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func parforalloc(nthrmax uint32) *parfor {
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return &parfor{
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thr: &make([]parforthread, nthrmax)[0],
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nthrmax: nthrmax,
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}
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}
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var envs []string
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var argslice []string
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// called from syscall
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func runtime_envs() []string { return envs }
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// called from os
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func runtime_args() []string { return argslice }
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