092dd2bc33
This doesn't change any actual code, it just starts using the Go
definition of the schedt type and the sched variable rather than the C
definitions.
The schedt type is tweaked slightly for gccgo. We aren't going to
release goroutine stacks, so we don't need separate gfreeStack and
gfreeNostack lists. We only have one size of defer function, so we
don't need a list of 5 different pools.
Reviewed-on: https://go-review.googlesource.com/33364
From-SVN: r242600
528 lines
16 KiB
Go
528 lines
16 KiB
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 (
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"runtime/internal/atomic"
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"runtime/internal/sys"
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"unsafe"
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)
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// Should be a built-in for unsafe.Pointer?
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//go:nosplit
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func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
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return unsafe.Pointer(uintptr(p) + x)
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}
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// getg returns the pointer to the current g.
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// The compiler rewrites calls to this function into instructions
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// that fetch the g directly (from TLS or from the dedicated register).
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func getg() *g
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// mcall switches from the g to the g0 stack and invokes fn(g),
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// where g is the goroutine that made the call.
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// mcall saves g's current PC/SP in g->sched so that it can be restored later.
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// It is up to fn to arrange for that later execution, typically by recording
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// g in a data structure, causing something to call ready(g) later.
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// mcall returns to the original goroutine g later, when g has been rescheduled.
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// fn must not return at all; typically it ends by calling schedule, to let the m
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// run other goroutines.
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//
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// mcall can only be called from g stacks (not g0, not gsignal).
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//
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// This must NOT be go:noescape: if fn is a stack-allocated closure,
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// fn puts g on a run queue, and g executes before fn returns, the
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// closure will be invalidated while it is still executing.
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func mcall(fn func(*g))
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// systemstack runs fn on a system stack.
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//
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// It is common to use a func literal as the argument, in order
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// to share inputs and outputs with the code around the call
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// to system stack:
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//
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// ... set up y ...
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// systemstack(func() {
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// x = bigcall(y)
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// })
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// ... use x ...
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//
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// For the gc toolchain this permits running a function that requires
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// additional stack space in a context where the stack can not be
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// split. For gccgo, however, stack splitting is not managed by the
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// Go runtime. In effect, all stacks are system stacks. So this gccgo
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// version just runs the function.
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func systemstack(fn func()) {
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fn()
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}
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func badsystemstack() {
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throw("systemstack called from unexpected goroutine")
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}
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// memclr clears n bytes starting at ptr.
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// in memclr_*.s
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//go:noescape
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func memclr(ptr unsafe.Pointer, n uintptr)
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//go:linkname reflect_memclr reflect.memclr
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func reflect_memclr(ptr unsafe.Pointer, n uintptr) {
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memclr(ptr, n)
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}
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// memmove copies n bytes from "from" to "to".
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//go:noescape
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func memmove(to, from unsafe.Pointer, n uintptr)
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//go:linkname reflect_memmove reflect.memmove
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func reflect_memmove(to, from unsafe.Pointer, n uintptr) {
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memmove(to, from, n)
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}
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//go:noescape
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//extern __builtin_memcmp
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func memcmp(a, b unsafe.Pointer, size uintptr) int32
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// exported value for testing
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var hashLoad = loadFactor
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// in asm_*.s
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func fastrand1() uint32
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// in asm_*.s
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//go:noescape
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func memequal(a, b unsafe.Pointer, size uintptr) bool
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// noescape hides a pointer from escape analysis. noescape is
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// the identity function but escape analysis doesn't think the
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// output depends on the input. noescape is inlined and currently
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// compiles down to a single xor instruction.
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// USE CAREFULLY!
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//go:nosplit
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func noescape(p unsafe.Pointer) unsafe.Pointer {
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x := uintptr(p)
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return unsafe.Pointer(x ^ 0)
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}
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func mincore(addr unsafe.Pointer, n uintptr, dst *byte) int32
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//go:noescape
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func jmpdefer(fv *funcval, argp uintptr)
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func exit1(code int32)
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func asminit()
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func setg(gg *g)
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func breakpoint()
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// reflectcall calls fn with a copy of the n argument bytes pointed at by arg.
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// After fn returns, reflectcall copies n-retoffset result bytes
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// back into arg+retoffset before returning. If copying result bytes back,
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// the caller should pass the argument frame type as argtype, so that
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// call can execute appropriate write barriers during the copy.
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// Package reflect passes a frame type. In package runtime, there is only
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// one call that copies results back, in cgocallbackg1, and it does NOT pass a
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// frame type, meaning there are no write barriers invoked. See that call
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// site for justification.
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func reflectcall(argtype *_type, fn, arg unsafe.Pointer, argsize uint32, retoffset uint32)
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func procyield(cycles uint32)
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type neverCallThisFunction struct{}
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// goexit is the return stub at the top of every goroutine call stack.
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// Each goroutine stack is constructed as if goexit called the
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// goroutine's entry point function, so that when the entry point
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// function returns, it will return to goexit, which will call goexit1
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// to perform the actual exit.
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//
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// This function must never be called directly. Call goexit1 instead.
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// gentraceback assumes that goexit terminates the stack. A direct
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// call on the stack will cause gentraceback to stop walking the stack
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// prematurely and if there are leftover stack barriers it may panic.
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func goexit(neverCallThisFunction)
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// publicationBarrier performs a store/store barrier (a "publication"
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// or "export" barrier). Some form of synchronization is required
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// between initializing an object and making that object accessible to
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// another processor. Without synchronization, the initialization
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// writes and the "publication" write may be reordered, allowing the
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// other processor to follow the pointer and observe an uninitialized
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// object. In general, higher-level synchronization should be used,
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// such as locking or an atomic pointer write. publicationBarrier is
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// for when those aren't an option, such as in the implementation of
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// the memory manager.
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//
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// There's no corresponding barrier for the read side because the read
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// side naturally has a data dependency order. All architectures that
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// Go supports or seems likely to ever support automatically enforce
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// data dependency ordering.
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func publicationBarrier()
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//go:noescape
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func setcallerpc(argp unsafe.Pointer, pc uintptr)
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// getcallerpc returns the program counter (PC) of its caller's caller.
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// getcallersp returns the stack pointer (SP) of its caller's caller.
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// For both, the argp must be a pointer to the caller's first function argument.
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// The implementation may or may not use argp, depending on
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// the architecture.
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//
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// For example:
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//
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// func f(arg1, arg2, arg3 int) {
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// pc := getcallerpc(unsafe.Pointer(&arg1))
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// sp := getcallersp(unsafe.Pointer(&arg1))
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// }
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//
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// These two lines find the PC and SP immediately following
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// the call to f (where f will return).
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//
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// The call to getcallerpc and getcallersp must be done in the
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// frame being asked about. It would not be correct for f to pass &arg1
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// to another function g and let g call getcallerpc/getcallersp.
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// The call inside g might return information about g's caller or
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// information about f's caller or complete garbage.
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//
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// The result of getcallersp is correct at the time of the return,
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// but it may be invalidated by any subsequent call to a function
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// that might relocate the stack in order to grow or shrink it.
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// A general rule is that the result of getcallersp should be used
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// immediately and can only be passed to nosplit functions.
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//go:noescape
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func getcallerpc(argp unsafe.Pointer) uintptr
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//go:noescape
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func getcallersp(argp unsafe.Pointer) uintptr
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// argp used in Defer structs when there is no argp.
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const _NoArgs = ^uintptr(0)
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//go:linkname time_now time.now
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func time_now() (sec int64, nsec int32)
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// For gccgo, expose this for C callers.
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//go:linkname unixnanotime runtime.unixnanotime
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func unixnanotime() int64 {
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sec, nsec := time_now()
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return sec*1e9 + int64(nsec)
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}
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// round n up to a multiple of a. a must be a power of 2.
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func round(n, a uintptr) uintptr {
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return (n + a - 1) &^ (a - 1)
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}
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// checkASM returns whether assembly runtime checks have passed.
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func checkASM() bool {
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return true
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}
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// For gccgo this is in the C code.
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func osyield()
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// For gccgo this can be called directly.
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//extern syscall
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func syscall(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) uintptr
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// throw crashes the program.
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// For gccgo unless and until we port panic.go.
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func throw(string)
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// newobject allocates a new object.
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// For gccgo unless and until we port malloc.go.
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func newobject(*_type) unsafe.Pointer
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// newarray allocates a new array of objects.
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// For gccgo unless and until we port malloc.go.
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func newarray(*_type, int) unsafe.Pointer
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// funcPC returns the entry PC of the function f.
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// It assumes that f is a func value. Otherwise the behavior is undefined.
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// For gccgo here unless and until we port proc.go.
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// Note that this differs from the gc implementation; the gc implementation
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// adds sys.PtrSize to the address of the interface value, but GCC's
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// alias analysis decides that that can not be a reference to the second
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// field of the interface, and in some cases it drops the initialization
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// of the second field as a dead store.
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//go:nosplit
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func funcPC(f interface{}) uintptr {
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i := (*iface)(unsafe.Pointer(&f))
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return **(**uintptr)(i.data)
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}
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// typedmemmove copies a typed value.
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// For gccgo for now.
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//go:nosplit
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func typedmemmove(typ *_type, dst, src unsafe.Pointer) {
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memmove(dst, src, typ.size)
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}
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// Temporary for gccgo until we port mbarrier.go.
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//go:linkname typedslicecopy runtime.typedslicecopy
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func typedslicecopy(typ *_type, dst, src slice) int {
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n := dst.len
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if n > src.len {
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n = src.len
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}
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if n == 0 {
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return 0
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}
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memmove(dst.array, src.array, uintptr(n)*typ.size)
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return n
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}
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// Here for gccgo until we port malloc.go.
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const (
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_64bit = 1 << (^uintptr(0) >> 63) / 2
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_MHeapMap_TotalBits = (_64bit*sys.GoosWindows)*35 + (_64bit*(1-sys.GoosWindows)*(1-sys.GoosDarwin*sys.GoarchArm64))*39 + sys.GoosDarwin*sys.GoarchArm64*31 + (1-_64bit)*32
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_MaxMem = uintptr(1<<_MHeapMap_TotalBits - 1)
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)
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// Here for gccgo until we port malloc.go.
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//extern runtime_mallocgc
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func c_mallocgc(size uintptr, typ uintptr, flag uint32) unsafe.Pointer
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func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
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flag := uint32(0)
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if !needzero {
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flag = 1 << 3
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}
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return c_mallocgc(size, uintptr(unsafe.Pointer(typ)), flag)
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}
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// Here for gccgo until we port mgc.go.
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var writeBarrier struct {
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enabled bool // compiler emits a check of this before calling write barrier
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needed bool // whether we need a write barrier for current GC phase
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cgo bool // whether we need a write barrier for a cgo check
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alignme uint64 // guarantee alignment so that compiler can use a 32 or 64-bit load
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}
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// Here for gccgo until we port atomic_pointer.go and mgc.go.
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//go:nosplit
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func casp(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool {
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if !atomic.Casp1((*unsafe.Pointer)(noescape(unsafe.Pointer(ptr))), noescape(old), new) {
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return false
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}
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return true
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}
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// Here for gccgo until we port lock_*.go.
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func lock(l *mutex)
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func unlock(l *mutex)
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// Here for gccgo for netpoll and Solaris.
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func errno() int
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// Temporary for gccgo until we port proc.go.
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func entersyscall(int32)
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func entersyscallblock(int32)
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func exitsyscall(int32)
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func gopark(func(*g, unsafe.Pointer) bool, unsafe.Pointer, string, byte, int)
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func goparkunlock(*mutex, string, byte, int)
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func goready(*g, int)
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// Temporary hack for gccgo until we port proc.go.
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//go:nosplit
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func acquireSudog() *sudog {
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mp := acquirem()
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pp := mp.p.ptr()
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if len(pp.sudogcache) == 0 {
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pp.sudogcache = append(pp.sudogcache, new(sudog))
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}
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n := len(pp.sudogcache)
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s := pp.sudogcache[n-1]
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pp.sudogcache[n-1] = nil
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pp.sudogcache = pp.sudogcache[:n-1]
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if s.elem != nil {
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throw("acquireSudog: found s.elem != nil in cache")
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}
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releasem(mp)
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return s
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}
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// Temporary hack for gccgo until we port proc.go.
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//go:nosplit
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func releaseSudog(s *sudog) {
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if s.elem != nil {
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throw("runtime: sudog with non-nil elem")
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}
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if s.selectdone != nil {
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throw("runtime: sudog with non-nil selectdone")
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}
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if s.next != nil {
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throw("runtime: sudog with non-nil next")
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}
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if s.prev != nil {
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throw("runtime: sudog with non-nil prev")
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}
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if s.waitlink != nil {
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throw("runtime: sudog with non-nil waitlink")
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}
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if s.c != nil {
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throw("runtime: sudog with non-nil c")
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}
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gp := getg()
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if gp.param != nil {
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throw("runtime: releaseSudog with non-nil gp.param")
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}
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mp := acquirem() // avoid rescheduling to another P
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pp := mp.p.ptr()
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pp.sudogcache = append(pp.sudogcache, s)
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releasem(mp)
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}
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// Temporary hack for gccgo until we port the garbage collector.
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func typeBitsBulkBarrier(typ *_type, p, size uintptr) {}
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// Here for gccgo until we port msize.go.
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func roundupsize(uintptr) uintptr
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// Here for gccgo until we port mgc.go.
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func GC()
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// Here for gccgo until we port proc.go.
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var worldsema uint32 = 1
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func stopTheWorldWithSema()
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func startTheWorldWithSema()
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// For gccgo to call from C code.
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//go:linkname acquireWorldsema runtime.acquireWorldsema
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func acquireWorldsema() {
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semacquire(&worldsema, false)
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}
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// For gccgo to call from C code.
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//go:linkname releaseWorldsema runtime.releaseWorldsema
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func releaseWorldsema() {
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semrelease(&worldsema)
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}
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// Here for gccgo until we port proc.go.
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func stopTheWorld(reason string) {
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semacquire(&worldsema, false)
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getg().m.preemptoff = reason
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getg().m.gcing = 1
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systemstack(stopTheWorldWithSema)
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}
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// Here for gccgo until we port proc.go.
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func startTheWorld() {
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getg().m.gcing = 0
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getg().m.locks++
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systemstack(startTheWorldWithSema)
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// worldsema must be held over startTheWorldWithSema to ensure
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// gomaxprocs cannot change while worldsema is held.
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semrelease(&worldsema)
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getg().m.preemptoff = ""
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getg().m.locks--
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}
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// For gccgo to call from C code, so that the C code and the Go code
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// can share the memstats variable for now.
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//go:linkname getMstats runtime.getMstats
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func getMstats() *mstats {
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return &memstats
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}
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// Temporary for gccgo until we port proc.go.
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|
func setcpuprofilerate_m(hz int32)
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// Temporary for gccgo until we port mem_GOOS.go.
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|
func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer
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// Temporary for gccgo until we port proc.go, so that the C signal
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// handler can call into cpuprof.
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//go:linkname cpuprofAdd runtime.cpuprofAdd
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func cpuprofAdd(stk []uintptr) {
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cpuprof.add(stk)
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}
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// For gccgo until we port proc.go.
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|
func Breakpoint()
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|
func LockOSThread()
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func UnlockOSThread()
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func allm() *m
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|
func allgs() []*g
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//go:nosplit
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func readgstatus(gp *g) uint32 {
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return atomic.Load(&gp.atomicstatus)
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}
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// Temporary for gccgo until we port malloc.go
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|
func persistentalloc(size, align uintptr, sysStat *uint64) unsafe.Pointer
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// Temporary for gccgo until we port mheap.go
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|
func setprofilebucket(p unsafe.Pointer, b *bucket)
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// Currently in proc.c.
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|
func tracebackothers(*g)
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// Temporary for gccgo until we port mgc.go.
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|
func setgcpercent(int32) int32
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//go:linkname setGCPercent runtime_debug.setGCPercent
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|
func setGCPercent(in int32) (out int32) {
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return setgcpercent(in)
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}
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// Temporary for gccgo until we port proc.go.
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|
func setmaxthreads(int) int
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//go:linkname setMaxThreads runtime_debug.setMaxThreads
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|
func setMaxThreads(in int) (out int) {
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return setmaxthreads(in)
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}
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// Temporary for gccgo until we port atomic_pointer.go.
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|
//go:nosplit
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|
func atomicstorep(ptr unsafe.Pointer, new unsafe.Pointer) {
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atomic.StorepNoWB(noescape(ptr), new)
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}
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// Temporary for gccgo until we port mbarrier.go
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|
func writebarrierptr(dst *uintptr, src uintptr) {
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*dst = src
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}
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|
|
// Temporary for gccgo until we port malloc.go
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|
var zerobase uintptr
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|
|
//go:linkname getZerobase runtime.getZerobase
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|
func getZerobase() *uintptr {
|
|
return &zerobase
|
|
}
|
|
|
|
// Temporary for gccgo until we port proc.go.
|
|
func needm()
|
|
func dropm()
|
|
func sigprof()
|
|
func mcount() int32
|
|
func gcount() int32
|
|
|
|
// Signal trampoline, written in C.
|
|
func sigtramp()
|
|
|
|
// The sa_handler field is generally hidden in a union, so use C accessors.
|
|
func getSigactionHandler(*_sigaction) uintptr
|
|
func setSigactionHandler(*_sigaction, uintptr)
|
|
|
|
// Retrieve fields from the siginfo_t and ucontext_t pointers passed
|
|
// to a signal handler using C, as they are often hidden in a union.
|
|
// Returns and, if available, PC where signal occurred.
|
|
func getSiginfo(*_siginfo_t, unsafe.Pointer) (sigaddr uintptr, sigpc uintptr)
|
|
|
|
// Implemented in C for gccgo.
|
|
func dumpregs(*_siginfo_t, unsafe.Pointer)
|
|
|
|
// Temporary for gccgo until we port panic.go.
|
|
func startpanic()
|
|
|
|
// Temporary for gccgo until we port proc.go.
|
|
//go:linkname getsched runtime.getsched
|
|
func getsched() *schedt {
|
|
return &sched
|
|
}
|