// 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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"runtime/internal/sys"
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"unsafe"
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)
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// The code in this file implements stack trace walking for all architectures.
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// The most important fact about a given architecture is whether it uses a link register.
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// On systems with link registers, the prologue for a non-leaf function stores the
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// incoming value of LR at the bottom of the newly allocated stack frame.
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// On systems without link registers, the architecture pushes a return PC during
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// the call instruction, so the return PC ends up above the stack frame.
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// In this file, the return PC is always called LR, no matter how it was found.
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//
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// To date, the opposite of a link register architecture is an x86 architecture.
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// This code may need to change if some other kind of non-link-register
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// architecture comes along.
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//
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// The other important fact is the size of a pointer: on 32-bit systems the LR
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// takes up only 4 bytes on the stack, while on 64-bit systems it takes up 8 bytes.
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// Typically this is ptrSize.
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//
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// As an exception, amd64p32 has ptrSize == 4 but the CALL instruction still
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// stores an 8-byte return PC onto the stack. To accommodate this, we use regSize
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// as the size of the architecture-pushed return PC.
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//
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// usesLR is defined below in terms of minFrameSize, which is defined in
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// arch_$GOARCH.go. ptrSize and regSize are defined in stubs.go.
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const usesLR = sys.MinFrameSize > 0
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var skipPC uintptr
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func tracebackinit() {
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// Go variable initialization happens late during runtime startup.
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// Instead of initializing the variables above in the declarations,
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// schedinit calls this function so that the variables are
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// initialized and available earlier in the startup sequence.
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skipPC = funcPC(skipPleaseUseCallersFrames)
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}
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// Traceback over the deferred function calls.
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// Report them like calls that have been invoked but not started executing yet.
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func tracebackdefers(gp *g, callback func(*stkframe, unsafe.Pointer) bool, v unsafe.Pointer) {
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var frame stkframe
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for d := gp._defer; d != nil; d = d.link {
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fn := d.fn
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if fn == nil {
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// Defer of nil function. Args don't matter.
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frame.pc = 0
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frame.fn = funcInfo{}
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frame.argp = 0
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frame.arglen = 0
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frame.argmap = nil
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} else {
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frame.pc = fn.fn
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f := findfunc(frame.pc)
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if !f.valid() {
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print("runtime: unknown pc in defer ", hex(frame.pc), "\n")
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throw("unknown pc")
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}
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frame.fn = f
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frame.argp = uintptr(deferArgs(d))
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var ok bool
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frame.arglen, frame.argmap, ok = getArgInfoFast(f, true)
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if !ok {
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frame.arglen, frame.argmap = getArgInfo(&frame, f, true, fn)
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}
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}
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frame.continpc = frame.pc
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if !callback((*stkframe)(noescape(unsafe.Pointer(&frame))), v) {
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return
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}
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}
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}
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const sizeofSkipFunction = 256
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// This function is defined in asm.s to be sizeofSkipFunction bytes long.
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func skipPleaseUseCallersFrames()
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// Generic traceback. Handles runtime stack prints (pcbuf == nil),
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// the runtime.Callers function (pcbuf != nil), as well as the garbage
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// collector (callback != nil). A little clunky to merge these, but avoids
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// duplicating the code and all its subtlety.
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//
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// The skip argument is only valid with pcbuf != nil and counts the number
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// of logical frames to skip rather than physical frames (with inlining, a
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// PC in pcbuf can represent multiple calls). If a PC is partially skipped
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// and max > 1, pcbuf[1] will be runtime.skipPleaseUseCallersFrames+N where
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// N indicates the number of logical frames to skip in pcbuf[0].
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func gentraceback(pc0, sp0, lr0 uintptr, gp *g, skip int, pcbuf *uintptr, max int, callback func(*stkframe, unsafe.Pointer) bool, v unsafe.Pointer, flags uint) int {
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if skip > 0 && callback != nil {
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throw("gentraceback callback cannot be used with non-zero skip")
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}
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// Don't call this "g"; it's too easy get "g" and "gp" confused.
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if ourg := getg(); ourg == gp && ourg == ourg.m.curg {
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// The starting sp has been passed in as a uintptr, and the caller may
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// have other uintptr-typed stack references as well.
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// If during one of the calls that got us here or during one of the
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// callbacks below the stack must be grown, all these uintptr references
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// to the stack will not be updated, and gentraceback will continue
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// to inspect the old stack memory, which may no longer be valid.
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// Even if all the variables were updated correctly, it is not clear that
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// we want to expose a traceback that begins on one stack and ends
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// on another stack. That could confuse callers quite a bit.
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// Instead, we require that gentraceback and any other function that
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// accepts an sp for the current goroutine (typically obtained by
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// calling getcallersp) must not run on that goroutine's stack but
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// instead on the g0 stack.
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throw("gentraceback cannot trace user goroutine on its own stack")
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}
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level, _, _ := gotraceback()
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if pc0 == ^uintptr(0) && sp0 == ^uintptr(0) { // Signal to fetch saved values from gp.
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if gp.syscallsp != 0 {
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pc0 = gp.syscallpc
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sp0 = gp.syscallsp
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if usesLR {
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lr0 = 0
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}
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} else {
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pc0 = gp.sched.pc
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sp0 = gp.sched.sp
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if usesLR {
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lr0 = gp.sched.lr
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}
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}
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}
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nprint := 0
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var frame stkframe
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frame.pc = pc0
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frame.sp = sp0
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if usesLR {
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frame.lr = lr0
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}
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waspanic := false
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cgoCtxt := gp.cgoCtxt
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printing := pcbuf == nil && callback == nil
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_defer := gp._defer
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for _defer != nil && _defer.sp == _NoArgs {
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_defer = _defer.link
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}
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// If the PC is zero, it's likely a nil function call.
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// Start in the caller's frame.
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if frame.pc == 0 {
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if usesLR {
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frame.pc = *(*uintptr)(unsafe.Pointer(frame.sp))
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frame.lr = 0
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} else {
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frame.pc = uintptr(*(*sys.Uintreg)(unsafe.Pointer(frame.sp)))
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frame.sp += sys.RegSize
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}
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}
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f := findfunc(frame.pc)
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if !f.valid() {
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if callback != nil || printing {
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print("runtime: unknown pc ", hex(frame.pc), "\n")
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tracebackHexdump(gp.stack, &frame, 0)
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}
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if callback != nil {
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throw("unknown pc")
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}
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return 0
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}
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frame.fn = f
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var cache pcvalueCache
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lastFuncID := funcID_normal
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n := 0
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for n < max {
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// Typically:
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// pc is the PC of the running function.
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// sp is the stack pointer at that program counter.
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// fp is the frame pointer (caller's stack pointer) at that program counter, or nil if unknown.
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// stk is the stack containing sp.
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// The caller's program counter is lr, unless lr is zero, in which case it is *(uintptr*)sp.
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f = frame.fn
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if f.pcsp == 0 {
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// No frame information, must be external function, like race support.
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// See golang.org/issue/13568.
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break
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}
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// Found an actual function.
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// Derive frame pointer and link register.
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if frame.fp == 0 {
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// Jump over system stack transitions. If we're on g0 and there's a user
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// goroutine, try to jump. Otherwise this is a regular call.
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if flags&_TraceJumpStack != 0 && gp == gp.m.g0 && gp.m.curg != nil {
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switch f.funcID {
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case funcID_morestack:
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// morestack does not return normally -- newstack()
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// gogo's to curg.sched. Match that.
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// This keeps morestack() from showing up in the backtrace,
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// but that makes some sense since it'll never be returned
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// to.
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frame.pc = gp.m.curg.sched.pc
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frame.fn = findfunc(frame.pc)
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f = frame.fn
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frame.sp = gp.m.curg.sched.sp
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cgoCtxt = gp.m.curg.cgoCtxt
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case funcID_systemstack:
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// systemstack returns normally, so just follow the
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// stack transition.
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frame.sp = gp.m.curg.sched.sp
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cgoCtxt = gp.m.curg.cgoCtxt
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}
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}
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frame.fp = frame.sp + uintptr(funcspdelta(f, frame.pc, &cache))
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if !usesLR {
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// On x86, call instruction pushes return PC before entering new function.
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frame.fp += sys.RegSize
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}
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}
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var flr funcInfo
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if topofstack(f, gp.m != nil && gp == gp.m.g0) {
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frame.lr = 0
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flr = funcInfo{}
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} else if usesLR && f.funcID == funcID_jmpdefer {
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// jmpdefer modifies SP/LR/PC non-atomically.
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// If a profiling interrupt arrives during jmpdefer,
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// the stack unwind may see a mismatched register set
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// and get confused. Stop if we see PC within jmpdefer
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// to avoid that confusion.
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// See golang.org/issue/8153.
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if callback != nil {
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throw("traceback_arm: found jmpdefer when tracing with callback")
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}
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frame.lr = 0
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} else {
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var lrPtr uintptr
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if usesLR {
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if n == 0 && frame.sp < frame.fp || frame.lr == 0 {
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lrPtr = frame.sp
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frame.lr = *(*uintptr)(unsafe.Pointer(lrPtr))
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}
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} else {
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if frame.lr == 0 {
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lrPtr = frame.fp - sys.RegSize
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frame.lr = uintptr(*(*sys.Uintreg)(unsafe.Pointer(lrPtr)))
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}
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}
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flr = findfunc(frame.lr)
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if !flr.valid() {
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// This happens if you get a profiling interrupt at just the wrong time.
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// In that context it is okay to stop early.
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// But if callback is set, we're doing a garbage collection and must
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// get everything, so crash loudly.
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doPrint := printing
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if doPrint && gp.m.incgo && f.funcID == funcID_sigpanic {
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// We can inject sigpanic
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// calls directly into C code,
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// in which case we'll see a C
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// return PC. Don't complain.
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doPrint = false
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}
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if callback != nil || doPrint {
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print("runtime: unexpected return pc for ", funcname(f), " called from ", hex(frame.lr), "\n")
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tracebackHexdump(gp.stack, &frame, lrPtr)
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}
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if callback != nil {
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throw("unknown caller pc")
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}
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}
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}
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frame.varp = frame.fp
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if !usesLR {
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// On x86, call instruction pushes return PC before entering new function.
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frame.varp -= sys.RegSize
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}
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// If framepointer_enabled and there's a frame, then
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// there's a saved bp here.
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if frame.varp > frame.sp && (framepointer_enabled && GOARCH == "amd64" || GOARCH == "arm64") {
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frame.varp -= sys.RegSize
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}
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// Derive size of arguments.
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// Most functions have a fixed-size argument block,
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// so we can use metadata about the function f.
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// Not all, though: there are some variadic functions
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// in package runtime and reflect, and for those we use call-specific
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// metadata recorded by f's caller.
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if callback != nil || printing {
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frame.argp = frame.fp + sys.MinFrameSize
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var ok bool
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frame.arglen, frame.argmap, ok = getArgInfoFast(f, callback != nil)
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if !ok {
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frame.arglen, frame.argmap = getArgInfo(&frame, f, callback != nil, nil)
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}
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}
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// Determine frame's 'continuation PC', where it can continue.
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// Normally this is the return address on the stack, but if sigpanic
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// is immediately below this function on the stack, then the frame
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// stopped executing due to a trap, and frame.pc is probably not
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// a safe point for looking up liveness information. In this panicking case,
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// the function either doesn't return at all (if it has no defers or if the
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// defers do not recover) or it returns from one of the calls to
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// deferproc a second time (if the corresponding deferred func recovers).
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// In the latter case, use a deferreturn call site as the continuation pc.
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frame.continpc = frame.pc
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if waspanic {
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// We match up defers with frames using the SP.
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// However, if the function has an empty stack
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// frame, then it's possible (on LR machines)
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// for multiple call frames to have the same
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// SP. But, since a function with no frame
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// can't push a defer, the defer can't belong
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// to that frame.
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if _defer != nil && _defer.sp == frame.sp && frame.sp != frame.fp {
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frame.continpc = frame.fn.entry + uintptr(frame.fn.deferreturn) + 1
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// Note: the +1 is to offset the -1 that
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// stack.go:getStackMap does to back up a return
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// address make sure the pc is in the CALL instruction.
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} else {
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frame.continpc = 0
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}
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}
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// Unwind our local defer stack past this frame.
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for _defer != nil && ((_defer.sp == frame.sp && frame.sp != frame.fp) || _defer.sp == _NoArgs) {
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_defer = _defer.link
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}
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if callback != nil {
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if !callback((*stkframe)(noescape(unsafe.Pointer(&frame))), v) {
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return n
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}
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}
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if pcbuf != nil {
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pc := frame.pc
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// backup to CALL instruction to read inlining info (same logic as below)
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tracepc := pc
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if (n > 0 || flags&_TraceTrap == 0) && frame.pc > f.entry && !waspanic {
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tracepc--
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}
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// If there is inlining info, record the inner frames.
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if inldata := funcdata(f, _FUNCDATA_InlTree); inldata != nil {
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inltree := (*[1 << 20]inlinedCall)(inldata)
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for {
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ix := pcdatavalue(f, _PCDATA_InlTreeIndex, tracepc, &cache)
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if ix < 0 {
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break
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}
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if inltree[ix].funcID == funcID_wrapper && elideWrapperCalling(lastFuncID) {
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// ignore wrappers
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} else if skip > 0 {
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skip--
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} else if n < max {
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(*[1 << 20]uintptr)(unsafe.Pointer(pcbuf))[n] = pc
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n++
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}
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lastFuncID = inltree[ix].funcID
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// Back up to an instruction in the "caller".
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tracepc = frame.fn.entry + uintptr(inltree[ix].parentPc)
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pc = tracepc + 1
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}
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}
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// Record the main frame.
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if f.funcID == funcID_wrapper && elideWrapperCalling(lastFuncID) {
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// Ignore wrapper functions (except when they trigger panics).
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} else if skip > 0 {
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skip--
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} else if n < max {
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(*[1 << 20]uintptr)(unsafe.Pointer(pcbuf))[n] = pc
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n++
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}
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lastFuncID = f.funcID
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n-- // offset n++ below
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}
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if printing {
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// assume skip=0 for printing.
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//
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// Never elide wrappers if we haven't printed
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// any frames. And don't elide wrappers that
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// called panic rather than the wrapped
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// function. Otherwise, leave them out.
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// backup to CALL instruction to read inlining info (same logic as below)
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tracepc := frame.pc
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if (n > 0 || flags&_TraceTrap == 0) && frame.pc > f.entry && !waspanic {
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tracepc--
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}
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// If there is inlining info, print the inner frames.
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if inldata := funcdata(f, _FUNCDATA_InlTree); inldata != nil {
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inltree := (*[1 << 20]inlinedCall)(inldata)
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for {
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ix := pcdatavalue(f, _PCDATA_InlTreeIndex, tracepc, nil)
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if ix < 0 {
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break
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}
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if (flags&_TraceRuntimeFrames) != 0 || showframe(f, gp, nprint == 0, inltree[ix].funcID, lastFuncID) {
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name := funcnameFromNameoff(f, inltree[ix].func_)
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file, line := funcline(f, tracepc)
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print(name, "(...)\n")
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print("\t", file, ":", line, "\n")
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nprint++
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}
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lastFuncID = inltree[ix].funcID
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// Back up to an instruction in the "caller".
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tracepc = frame.fn.entry + uintptr(inltree[ix].parentPc)
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}
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}
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if (flags&_TraceRuntimeFrames) != 0 || showframe(f, gp, nprint == 0, f.funcID, lastFuncID) {
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// Print during crash.
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// main(0x1, 0x2, 0x3)
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// /home/rsc/go/src/runtime/x.go:23 +0xf
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//
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name := funcname(f)
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file, line := funcline(f, tracepc)
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if name == "runtime.gopanic" {
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name = "panic"
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}
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print(name, "(")
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argp := (*[100]uintptr)(unsafe.Pointer(frame.argp))
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for i := uintptr(0); i < frame.arglen/sys.PtrSize; i++ {
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if i >= 10 {
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print(", ...")
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break
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}
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if i != 0 {
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print(", ")
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}
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print(hex(argp[i]))
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}
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print(")\n")
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print("\t", file, ":", line)
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if frame.pc > f.entry {
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print(" +", hex(frame.pc-f.entry))
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}
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if gp.m != nil && gp.m.throwing > 0 && gp == gp.m.curg || level >= 2 {
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print(" fp=", hex(frame.fp), " sp=", hex(frame.sp), " pc=", hex(frame.pc))
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}
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print("\n")
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nprint++
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}
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lastFuncID = f.funcID
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}
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n++
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if f.funcID == funcID_cgocallback_gofunc && len(cgoCtxt) > 0 {
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ctxt := cgoCtxt[len(cgoCtxt)-1]
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cgoCtxt = cgoCtxt[:len(cgoCtxt)-1]
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// skip only applies to Go frames.
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// callback != nil only used when we only care
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// about Go frames.
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if skip == 0 && callback == nil {
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n = tracebackCgoContext(pcbuf, printing, ctxt, n, max)
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}
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}
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waspanic = f.funcID == funcID_sigpanic
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// Do not unwind past the bottom of the stack.
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if !flr.valid() {
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break
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}
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// Unwind to next frame.
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frame.fn = flr
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frame.pc = frame.lr
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frame.lr = 0
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frame.sp = frame.fp
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frame.fp = 0
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frame.argmap = nil
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// On link register architectures, sighandler saves the LR on stack
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// before faking a call to sigpanic.
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if usesLR && waspanic {
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x := *(*uintptr)(unsafe.Pointer(frame.sp))
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frame.sp += sys.MinFrameSize
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if GOARCH == "arm64" {
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// arm64 needs 16-byte aligned SP, always
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frame.sp += sys.PtrSize
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}
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f = findfunc(frame.pc)
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frame.fn = f
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if !f.valid() {
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frame.pc = x
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} else if funcspdelta(f, frame.pc, &cache) == 0 {
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frame.lr = x
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}
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}
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}
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if printing {
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n = nprint
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}
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// If callback != nil, we're being called to gather stack information during
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// garbage collection or stack growth. In that context, require that we used
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// up the entire defer stack. If not, then there is a bug somewhere and the
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// garbage collection or stack growth may not have seen the correct picture
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// of the stack. Crash now instead of silently executing the garbage collection
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// or stack copy incorrectly and setting up for a mysterious crash later.
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//
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// Note that panic != nil is okay here: there can be leftover panics,
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// because the defers on the panic stack do not nest in frame order as
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// they do on the defer stack. If you have:
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//
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// frame 1 defers d1
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// frame 2 defers d2
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// frame 3 defers d3
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// frame 4 panics
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// frame 4's panic starts running defers
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// frame 5, running d3, defers d4
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// frame 5 panics
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// frame 5's panic starts running defers
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// frame 6, running d4, garbage collects
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// frame 6, running d2, garbage collects
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//
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// During the execution of d4, the panic stack is d4 -> d3, which
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// is nested properly, and we'll treat frame 3 as resumable, because we
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// can find d3. (And in fact frame 3 is resumable. If d4 recovers
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// and frame 5 continues running, d3, d3 can recover and we'll
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// resume execution in (returning from) frame 3.)
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//
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// During the execution of d2, however, the panic stack is d2 -> d3,
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// which is inverted. The scan will match d2 to frame 2 but having
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// d2 on the stack until then means it will not match d3 to frame 3.
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// This is okay: if we're running d2, then all the defers after d2 have
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// completed and their corresponding frames are dead. Not finding d3
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// for frame 3 means we'll set frame 3's continpc == 0, which is correct
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// (frame 3 is dead). At the end of the walk the panic stack can thus
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// contain defers (d3 in this case) for dead frames. The inversion here
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// always indicates a dead frame, and the effect of the inversion on the
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// scan is to hide those dead frames, so the scan is still okay:
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// what's left on the panic stack are exactly (and only) the dead frames.
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//
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// We require callback != nil here because only when callback != nil
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// do we know that gentraceback is being called in a "must be correct"
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// context as opposed to a "best effort" context. The tracebacks with
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// callbacks only happen when everything is stopped nicely.
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// At other times, such as when gathering a stack for a profiling signal
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// or when printing a traceback during a crash, everything may not be
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// stopped nicely, and the stack walk may not be able to complete.
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// It's okay in those situations not to use up the entire defer stack:
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// incomplete information then is still better than nothing.
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if callback != nil && n < max && _defer != nil {
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print("runtime: g", gp.goid, ": leftover defer sp=", hex(_defer.sp), " pc=", hex(_defer.pc), "\n")
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for _defer = gp._defer; _defer != nil; _defer = _defer.link {
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print("\tdefer ", _defer, " sp=", hex(_defer.sp), " pc=", hex(_defer.pc), "\n")
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}
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throw("traceback has leftover defers")
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}
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if callback != nil && n < max && frame.sp != gp.stktopsp {
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print("runtime: g", gp.goid, ": frame.sp=", hex(frame.sp), " top=", hex(gp.stktopsp), "\n")
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print("\tstack=[", hex(gp.stack.lo), "-", hex(gp.stack.hi), "] n=", n, " max=", max, "\n")
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throw("traceback did not unwind completely")
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}
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return n
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}
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// reflectMethodValue is a partial duplicate of reflect.makeFuncImpl
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// and reflect.methodValue.
|
type reflectMethodValue struct {
|
fn uintptr
|
stack *bitvector // ptrmap for both args and results
|
argLen uintptr // just args
|
}
|
|
// getArgInfoFast returns the argument frame information for a call to f.
|
// It is short and inlineable. However, it does not handle all functions.
|
// If ok reports false, you must call getArgInfo instead.
|
// TODO(josharian): once we do mid-stack inlining,
|
// call getArgInfo directly from getArgInfoFast and stop returning an ok bool.
|
func getArgInfoFast(f funcInfo, needArgMap bool) (arglen uintptr, argmap *bitvector, ok bool) {
|
return uintptr(f.args), nil, !(needArgMap && f.args == _ArgsSizeUnknown)
|
}
|
|
// getArgInfo returns the argument frame information for a call to f
|
// with call frame frame.
|
//
|
// This is used for both actual calls with active stack frames and for
|
// deferred calls that are not yet executing. If this is an actual
|
// call, ctxt must be nil (getArgInfo will retrieve what it needs from
|
// the active stack frame). If this is a deferred call, ctxt must be
|
// the function object that was deferred.
|
func getArgInfo(frame *stkframe, f funcInfo, needArgMap bool, ctxt *funcval) (arglen uintptr, argmap *bitvector) {
|
arglen = uintptr(f.args)
|
if needArgMap && f.args == _ArgsSizeUnknown {
|
// Extract argument bitmaps for reflect stubs from the calls they made to reflect.
|
switch funcname(f) {
|
case "reflect.makeFuncStub", "reflect.methodValueCall":
|
// These take a *reflect.methodValue as their
|
// context register.
|
var mv *reflectMethodValue
|
var retValid bool
|
if ctxt != nil {
|
// This is not an actual call, but a
|
// deferred call. The function value
|
// is itself the *reflect.methodValue.
|
mv = (*reflectMethodValue)(unsafe.Pointer(ctxt))
|
} else {
|
// This is a real call that took the
|
// *reflect.methodValue as its context
|
// register and immediately saved it
|
// to 0(SP). Get the methodValue from
|
// 0(SP).
|
arg0 := frame.sp + sys.MinFrameSize
|
mv = *(**reflectMethodValue)(unsafe.Pointer(arg0))
|
// Figure out whether the return values are valid.
|
// Reflect will update this value after it copies
|
// in the return values.
|
retValid = *(*bool)(unsafe.Pointer(arg0 + 3*sys.PtrSize))
|
}
|
if mv.fn != f.entry {
|
print("runtime: confused by ", funcname(f), "\n")
|
throw("reflect mismatch")
|
}
|
bv := mv.stack
|
arglen = uintptr(bv.n * sys.PtrSize)
|
if !retValid {
|
arglen = uintptr(mv.argLen) &^ (sys.PtrSize - 1)
|
}
|
argmap = bv
|
}
|
}
|
return
|
}
|
|
// tracebackCgoContext handles tracing back a cgo context value, from
|
// the context argument to setCgoTraceback, for the gentraceback
|
// function. It returns the new value of n.
|
func tracebackCgoContext(pcbuf *uintptr, printing bool, ctxt uintptr, n, max int) int {
|
var cgoPCs [32]uintptr
|
cgoContextPCs(ctxt, cgoPCs[:])
|
var arg cgoSymbolizerArg
|
anySymbolized := false
|
for _, pc := range cgoPCs {
|
if pc == 0 || n >= max {
|
break
|
}
|
if pcbuf != nil {
|
(*[1 << 20]uintptr)(unsafe.Pointer(pcbuf))[n] = pc
|
}
|
if printing {
|
if cgoSymbolizer == nil {
|
print("non-Go function at pc=", hex(pc), "\n")
|
} else {
|
c := printOneCgoTraceback(pc, max-n, &arg)
|
n += c - 1 // +1 a few lines down
|
anySymbolized = true
|
}
|
}
|
n++
|
}
|
if anySymbolized {
|
arg.pc = 0
|
callCgoSymbolizer(&arg)
|
}
|
return n
|
}
|
|
func printcreatedby(gp *g) {
|
// Show what created goroutine, except main goroutine (goid 1).
|
pc := gp.gopc
|
f := findfunc(pc)
|
if f.valid() && showframe(f, gp, false, funcID_normal, funcID_normal) && gp.goid != 1 {
|
printcreatedby1(f, pc)
|
}
|
}
|
|
func printcreatedby1(f funcInfo, pc uintptr) {
|
print("created by ", funcname(f), "\n")
|
tracepc := pc // back up to CALL instruction for funcline.
|
if pc > f.entry {
|
tracepc -= sys.PCQuantum
|
}
|
file, line := funcline(f, tracepc)
|
print("\t", file, ":", line)
|
if pc > f.entry {
|
print(" +", hex(pc-f.entry))
|
}
|
print("\n")
|
}
|
|
func traceback(pc, sp, lr uintptr, gp *g) {
|
traceback1(pc, sp, lr, gp, 0)
|
}
|
|
// tracebacktrap is like traceback but expects that the PC and SP were obtained
|
// from a trap, not from gp->sched or gp->syscallpc/gp->syscallsp or getcallerpc/getcallersp.
|
// Because they are from a trap instead of from a saved pair,
|
// the initial PC must not be rewound to the previous instruction.
|
// (All the saved pairs record a PC that is a return address, so we
|
// rewind it into the CALL instruction.)
|
// If gp.m.libcall{g,pc,sp} information is available, it uses that information in preference to
|
// the pc/sp/lr passed in.
|
func tracebacktrap(pc, sp, lr uintptr, gp *g) {
|
if gp.m.libcallsp != 0 {
|
// We're in C code somewhere, traceback from the saved position.
|
traceback1(gp.m.libcallpc, gp.m.libcallsp, 0, gp.m.libcallg.ptr(), 0)
|
return
|
}
|
traceback1(pc, sp, lr, gp, _TraceTrap)
|
}
|
|
func traceback1(pc, sp, lr uintptr, gp *g, flags uint) {
|
// If the goroutine is in cgo, and we have a cgo traceback, print that.
|
if iscgo && gp.m != nil && gp.m.ncgo > 0 && gp.syscallsp != 0 && gp.m.cgoCallers != nil && gp.m.cgoCallers[0] != 0 {
|
// Lock cgoCallers so that a signal handler won't
|
// change it, copy the array, reset it, unlock it.
|
// We are locked to the thread and are not running
|
// concurrently with a signal handler.
|
// We just have to stop a signal handler from interrupting
|
// in the middle of our copy.
|
atomic.Store(&gp.m.cgoCallersUse, 1)
|
cgoCallers := *gp.m.cgoCallers
|
gp.m.cgoCallers[0] = 0
|
atomic.Store(&gp.m.cgoCallersUse, 0)
|
|
printCgoTraceback(&cgoCallers)
|
}
|
|
var n int
|
if readgstatus(gp)&^_Gscan == _Gsyscall {
|
// Override registers if blocked in system call.
|
pc = gp.syscallpc
|
sp = gp.syscallsp
|
flags &^= _TraceTrap
|
}
|
// Print traceback. By default, omits runtime frames.
|
// If that means we print nothing at all, repeat forcing all frames printed.
|
n = gentraceback(pc, sp, lr, gp, 0, nil, _TracebackMaxFrames, nil, nil, flags)
|
if n == 0 && (flags&_TraceRuntimeFrames) == 0 {
|
n = gentraceback(pc, sp, lr, gp, 0, nil, _TracebackMaxFrames, nil, nil, flags|_TraceRuntimeFrames)
|
}
|
if n == _TracebackMaxFrames {
|
print("...additional frames elided...\n")
|
}
|
printcreatedby(gp)
|
|
if gp.ancestors == nil {
|
return
|
}
|
for _, ancestor := range *gp.ancestors {
|
printAncestorTraceback(ancestor)
|
}
|
}
|
|
// printAncestorTraceback prints the traceback of the given ancestor.
|
// TODO: Unify this with gentraceback and CallersFrames.
|
func printAncestorTraceback(ancestor ancestorInfo) {
|
print("[originating from goroutine ", ancestor.goid, "]:\n")
|
for fidx, pc := range ancestor.pcs {
|
f := findfunc(pc) // f previously validated
|
if showfuncinfo(f, fidx == 0, funcID_normal, funcID_normal) {
|
printAncestorTracebackFuncInfo(f, pc)
|
}
|
}
|
if len(ancestor.pcs) == _TracebackMaxFrames {
|
print("...additional frames elided...\n")
|
}
|
// Show what created goroutine, except main goroutine (goid 1).
|
f := findfunc(ancestor.gopc)
|
if f.valid() && showfuncinfo(f, false, funcID_normal, funcID_normal) && ancestor.goid != 1 {
|
printcreatedby1(f, ancestor.gopc)
|
}
|
}
|
|
// printAncestorTraceback prints the given function info at a given pc
|
// within an ancestor traceback. The precision of this info is reduced
|
// due to only have access to the pcs at the time of the caller
|
// goroutine being created.
|
func printAncestorTracebackFuncInfo(f funcInfo, pc uintptr) {
|
name := funcname(f)
|
if inldata := funcdata(f, _FUNCDATA_InlTree); inldata != nil {
|
inltree := (*[1 << 20]inlinedCall)(inldata)
|
ix := pcdatavalue(f, _PCDATA_InlTreeIndex, pc, nil)
|
if ix >= 0 {
|
name = funcnameFromNameoff(f, inltree[ix].func_)
|
}
|
}
|
file, line := funcline(f, pc)
|
if name == "runtime.gopanic" {
|
name = "panic"
|
}
|
print(name, "(...)\n")
|
print("\t", file, ":", line)
|
if pc > f.entry {
|
print(" +", hex(pc-f.entry))
|
}
|
print("\n")
|
}
|
|
func callers(skip int, pcbuf []uintptr) int {
|
sp := getcallersp()
|
pc := getcallerpc()
|
gp := getg()
|
var n int
|
systemstack(func() {
|
n = gentraceback(pc, sp, 0, gp, skip, &pcbuf[0], len(pcbuf), nil, nil, 0)
|
})
|
return n
|
}
|
|
func gcallers(gp *g, skip int, pcbuf []uintptr) int {
|
return gentraceback(^uintptr(0), ^uintptr(0), 0, gp, skip, &pcbuf[0], len(pcbuf), nil, nil, 0)
|
}
|
|
// showframe reports whether the frame with the given characteristics should
|
// be printed during a traceback.
|
func showframe(f funcInfo, gp *g, firstFrame bool, funcID, childID funcID) bool {
|
g := getg()
|
if g.m.throwing > 0 && gp != nil && (gp == g.m.curg || gp == g.m.caughtsig.ptr()) {
|
return true
|
}
|
return showfuncinfo(f, firstFrame, funcID, childID)
|
}
|
|
// showfuncinfo reports whether a function with the given characteristics should
|
// be printed during a traceback.
|
func showfuncinfo(f funcInfo, firstFrame bool, funcID, childID funcID) bool {
|
level, _, _ := gotraceback()
|
if level > 1 {
|
// Show all frames.
|
return true
|
}
|
|
if !f.valid() {
|
return false
|
}
|
|
if funcID == funcID_wrapper && elideWrapperCalling(childID) {
|
return false
|
}
|
|
name := funcname(f)
|
|
// Special case: always show runtime.gopanic frame
|
// in the middle of a stack trace, so that we can
|
// see the boundary between ordinary code and
|
// panic-induced deferred code.
|
// See golang.org/issue/5832.
|
if name == "runtime.gopanic" && !firstFrame {
|
return true
|
}
|
|
return contains(name, ".") && (!hasPrefix(name, "runtime.") || isExportedRuntime(name))
|
}
|
|
// isExportedRuntime reports whether name is an exported runtime function.
|
// It is only for runtime functions, so ASCII A-Z is fine.
|
func isExportedRuntime(name string) bool {
|
const n = len("runtime.")
|
return len(name) > n && name[:n] == "runtime." && 'A' <= name[n] && name[n] <= 'Z'
|
}
|
|
// elideWrapperCalling reports whether a wrapper function that called
|
// function id should be elided from stack traces.
|
func elideWrapperCalling(id funcID) bool {
|
// If the wrapper called a panic function instead of the
|
// wrapped function, we want to include it in stacks.
|
return !(id == funcID_gopanic || id == funcID_sigpanic || id == funcID_panicwrap)
|
}
|
|
var gStatusStrings = [...]string{
|
_Gidle: "idle",
|
_Grunnable: "runnable",
|
_Grunning: "running",
|
_Gsyscall: "syscall",
|
_Gwaiting: "waiting",
|
_Gdead: "dead",
|
_Gcopystack: "copystack",
|
}
|
|
func goroutineheader(gp *g) {
|
gpstatus := readgstatus(gp)
|
|
isScan := gpstatus&_Gscan != 0
|
gpstatus &^= _Gscan // drop the scan bit
|
|
// Basic string status
|
var status string
|
if 0 <= gpstatus && gpstatus < uint32(len(gStatusStrings)) {
|
status = gStatusStrings[gpstatus]
|
} else {
|
status = "???"
|
}
|
|
// Override.
|
if gpstatus == _Gwaiting && gp.waitreason != waitReasonZero {
|
status = gp.waitreason.String()
|
}
|
|
// approx time the G is blocked, in minutes
|
var waitfor int64
|
if (gpstatus == _Gwaiting || gpstatus == _Gsyscall) && gp.waitsince != 0 {
|
waitfor = (nanotime() - gp.waitsince) / 60e9
|
}
|
print("goroutine ", gp.goid, " [", status)
|
if isScan {
|
print(" (scan)")
|
}
|
if waitfor >= 1 {
|
print(", ", waitfor, " minutes")
|
}
|
if gp.lockedm != 0 {
|
print(", locked to thread")
|
}
|
print("]:\n")
|
}
|
|
func tracebackothers(me *g) {
|
level, _, _ := gotraceback()
|
|
// Show the current goroutine first, if we haven't already.
|
g := getg()
|
gp := g.m.curg
|
if gp != nil && gp != me {
|
print("\n")
|
goroutineheader(gp)
|
traceback(^uintptr(0), ^uintptr(0), 0, gp)
|
}
|
|
lock(&allglock)
|
for _, gp := range allgs {
|
if gp == me || gp == g.m.curg || readgstatus(gp) == _Gdead || isSystemGoroutine(gp, false) && level < 2 {
|
continue
|
}
|
print("\n")
|
goroutineheader(gp)
|
// Note: gp.m == g.m occurs when tracebackothers is
|
// called from a signal handler initiated during a
|
// systemstack call. The original G is still in the
|
// running state, and we want to print its stack.
|
if gp.m != g.m && readgstatus(gp)&^_Gscan == _Grunning {
|
print("\tgoroutine running on other thread; stack unavailable\n")
|
printcreatedby(gp)
|
} else {
|
traceback(^uintptr(0), ^uintptr(0), 0, gp)
|
}
|
}
|
unlock(&allglock)
|
}
|
|
// tracebackHexdump hexdumps part of stk around frame.sp and frame.fp
|
// for debugging purposes. If the address bad is included in the
|
// hexdumped range, it will mark it as well.
|
func tracebackHexdump(stk stack, frame *stkframe, bad uintptr) {
|
const expand = 32 * sys.PtrSize
|
const maxExpand = 256 * sys.PtrSize
|
// Start around frame.sp.
|
lo, hi := frame.sp, frame.sp
|
// Expand to include frame.fp.
|
if frame.fp != 0 && frame.fp < lo {
|
lo = frame.fp
|
}
|
if frame.fp != 0 && frame.fp > hi {
|
hi = frame.fp
|
}
|
// Expand a bit more.
|
lo, hi = lo-expand, hi+expand
|
// But don't go too far from frame.sp.
|
if lo < frame.sp-maxExpand {
|
lo = frame.sp - maxExpand
|
}
|
if hi > frame.sp+maxExpand {
|
hi = frame.sp + maxExpand
|
}
|
// And don't go outside the stack bounds.
|
if lo < stk.lo {
|
lo = stk.lo
|
}
|
if hi > stk.hi {
|
hi = stk.hi
|
}
|
|
// Print the hex dump.
|
print("stack: frame={sp:", hex(frame.sp), ", fp:", hex(frame.fp), "} stack=[", hex(stk.lo), ",", hex(stk.hi), ")\n")
|
hexdumpWords(lo, hi, func(p uintptr) byte {
|
switch p {
|
case frame.fp:
|
return '>'
|
case frame.sp:
|
return '<'
|
case bad:
|
return '!'
|
}
|
return 0
|
})
|
}
|
|
// Does f mark the top of a goroutine stack?
|
func topofstack(f funcInfo, g0 bool) bool {
|
return f.funcID == funcID_goexit ||
|
f.funcID == funcID_mstart ||
|
f.funcID == funcID_mcall ||
|
f.funcID == funcID_morestack ||
|
f.funcID == funcID_rt0_go ||
|
f.funcID == funcID_externalthreadhandler ||
|
// asmcgocall is TOS on the system stack because it
|
// switches to the system stack, but in this case we
|
// can come back to the regular stack and still want
|
// to be able to unwind through the call that appeared
|
// on the regular stack.
|
(g0 && f.funcID == funcID_asmcgocall)
|
}
|
|
// isSystemGoroutine reports whether the goroutine g must be omitted
|
// in stack dumps and deadlock detector. This is any goroutine that
|
// starts at a runtime.* entry point, except for runtime.main and
|
// sometimes runtime.runfinq.
|
//
|
// If fixed is true, any goroutine that can vary between user and
|
// system (that is, the finalizer goroutine) is considered a user
|
// goroutine.
|
func isSystemGoroutine(gp *g, fixed bool) bool {
|
// Keep this in sync with cmd/trace/trace.go:isSystemGoroutine.
|
f := findfunc(gp.startpc)
|
if !f.valid() {
|
return false
|
}
|
if f.funcID == funcID_runtime_main {
|
return false
|
}
|
if f.funcID == funcID_runfinq {
|
// We include the finalizer goroutine if it's calling
|
// back into user code.
|
if fixed {
|
// This goroutine can vary. In fixed mode,
|
// always consider it a user goroutine.
|
return false
|
}
|
return !fingRunning
|
}
|
return hasPrefix(funcname(f), "runtime.")
|
}
|
|
// SetCgoTraceback records three C functions to use to gather
|
// traceback information from C code and to convert that traceback
|
// information into symbolic information. These are used when printing
|
// stack traces for a program that uses cgo.
|
//
|
// The traceback and context functions may be called from a signal
|
// handler, and must therefore use only async-signal safe functions.
|
// The symbolizer function may be called while the program is
|
// crashing, and so must be cautious about using memory. None of the
|
// functions may call back into Go.
|
//
|
// The context function will be called with a single argument, a
|
// pointer to a struct:
|
//
|
// struct {
|
// Context uintptr
|
// }
|
//
|
// In C syntax, this struct will be
|
//
|
// struct {
|
// uintptr_t Context;
|
// };
|
//
|
// If the Context field is 0, the context function is being called to
|
// record the current traceback context. It should record in the
|
// Context field whatever information is needed about the current
|
// point of execution to later produce a stack trace, probably the
|
// stack pointer and PC. In this case the context function will be
|
// called from C code.
|
//
|
// If the Context field is not 0, then it is a value returned by a
|
// previous call to the context function. This case is called when the
|
// context is no longer needed; that is, when the Go code is returning
|
// to its C code caller. This permits the context function to release
|
// any associated resources.
|
//
|
// While it would be correct for the context function to record a
|
// complete a stack trace whenever it is called, and simply copy that
|
// out in the traceback function, in a typical program the context
|
// function will be called many times without ever recording a
|
// traceback for that context. Recording a complete stack trace in a
|
// call to the context function is likely to be inefficient.
|
//
|
// The traceback function will be called with a single argument, a
|
// pointer to a struct:
|
//
|
// struct {
|
// Context uintptr
|
// SigContext uintptr
|
// Buf *uintptr
|
// Max uintptr
|
// }
|
//
|
// In C syntax, this struct will be
|
//
|
// struct {
|
// uintptr_t Context;
|
// uintptr_t SigContext;
|
// uintptr_t* Buf;
|
// uintptr_t Max;
|
// };
|
//
|
// The Context field will be zero to gather a traceback from the
|
// current program execution point. In this case, the traceback
|
// function will be called from C code.
|
//
|
// Otherwise Context will be a value previously returned by a call to
|
// the context function. The traceback function should gather a stack
|
// trace from that saved point in the program execution. The traceback
|
// function may be called from an execution thread other than the one
|
// that recorded the context, but only when the context is known to be
|
// valid and unchanging. The traceback function may also be called
|
// deeper in the call stack on the same thread that recorded the
|
// context. The traceback function may be called multiple times with
|
// the same Context value; it will usually be appropriate to cache the
|
// result, if possible, the first time this is called for a specific
|
// context value.
|
//
|
// If the traceback function is called from a signal handler on a Unix
|
// system, SigContext will be the signal context argument passed to
|
// the signal handler (a C ucontext_t* cast to uintptr_t). This may be
|
// used to start tracing at the point where the signal occurred. If
|
// the traceback function is not called from a signal handler,
|
// SigContext will be zero.
|
//
|
// Buf is where the traceback information should be stored. It should
|
// be PC values, such that Buf[0] is the PC of the caller, Buf[1] is
|
// the PC of that function's caller, and so on. Max is the maximum
|
// number of entries to store. The function should store a zero to
|
// indicate the top of the stack, or that the caller is on a different
|
// stack, presumably a Go stack.
|
//
|
// Unlike runtime.Callers, the PC values returned should, when passed
|
// to the symbolizer function, return the file/line of the call
|
// instruction. No additional subtraction is required or appropriate.
|
//
|
// On all platforms, the traceback function is invoked when a call from
|
// Go to C to Go requests a stack trace. On linux/amd64, linux/ppc64le,
|
// and freebsd/amd64, the traceback function is also invoked when a
|
// signal is received by a thread that is executing a cgo call. The
|
// traceback function should not make assumptions about when it is
|
// called, as future versions of Go may make additional calls.
|
//
|
// The symbolizer function will be called with a single argument, a
|
// pointer to a struct:
|
//
|
// struct {
|
// PC uintptr // program counter to fetch information for
|
// File *byte // file name (NUL terminated)
|
// Lineno uintptr // line number
|
// Func *byte // function name (NUL terminated)
|
// Entry uintptr // function entry point
|
// More uintptr // set non-zero if more info for this PC
|
// Data uintptr // unused by runtime, available for function
|
// }
|
//
|
// In C syntax, this struct will be
|
//
|
// struct {
|
// uintptr_t PC;
|
// char* File;
|
// uintptr_t Lineno;
|
// char* Func;
|
// uintptr_t Entry;
|
// uintptr_t More;
|
// uintptr_t Data;
|
// };
|
//
|
// The PC field will be a value returned by a call to the traceback
|
// function.
|
//
|
// The first time the function is called for a particular traceback,
|
// all the fields except PC will be 0. The function should fill in the
|
// other fields if possible, setting them to 0/nil if the information
|
// is not available. The Data field may be used to store any useful
|
// information across calls. The More field should be set to non-zero
|
// if there is more information for this PC, zero otherwise. If More
|
// is set non-zero, the function will be called again with the same
|
// PC, and may return different information (this is intended for use
|
// with inlined functions). If More is zero, the function will be
|
// called with the next PC value in the traceback. When the traceback
|
// is complete, the function will be called once more with PC set to
|
// zero; this may be used to free any information. Each call will
|
// leave the fields of the struct set to the same values they had upon
|
// return, except for the PC field when the More field is zero. The
|
// function must not keep a copy of the struct pointer between calls.
|
//
|
// When calling SetCgoTraceback, the version argument is the version
|
// number of the structs that the functions expect to receive.
|
// Currently this must be zero.
|
//
|
// The symbolizer function may be nil, in which case the results of
|
// the traceback function will be displayed as numbers. If the
|
// traceback function is nil, the symbolizer function will never be
|
// called. The context function may be nil, in which case the
|
// traceback function will only be called with the context field set
|
// to zero. If the context function is nil, then calls from Go to C
|
// to Go will not show a traceback for the C portion of the call stack.
|
//
|
// SetCgoTraceback should be called only once, ideally from an init function.
|
func SetCgoTraceback(version int, traceback, context, symbolizer unsafe.Pointer) {
|
if version != 0 {
|
panic("unsupported version")
|
}
|
|
if cgoTraceback != nil && cgoTraceback != traceback ||
|
cgoContext != nil && cgoContext != context ||
|
cgoSymbolizer != nil && cgoSymbolizer != symbolizer {
|
panic("call SetCgoTraceback only once")
|
}
|
|
cgoTraceback = traceback
|
cgoContext = context
|
cgoSymbolizer = symbolizer
|
|
// The context function is called when a C function calls a Go
|
// function. As such it is only called by C code in runtime/cgo.
|
if _cgo_set_context_function != nil {
|
cgocall(_cgo_set_context_function, context)
|
}
|
}
|
|
var cgoTraceback unsafe.Pointer
|
var cgoContext unsafe.Pointer
|
var cgoSymbolizer unsafe.Pointer
|
|
// cgoTracebackArg is the type passed to cgoTraceback.
|
type cgoTracebackArg struct {
|
context uintptr
|
sigContext uintptr
|
buf *uintptr
|
max uintptr
|
}
|
|
// cgoContextArg is the type passed to the context function.
|
type cgoContextArg struct {
|
context uintptr
|
}
|
|
// cgoSymbolizerArg is the type passed to cgoSymbolizer.
|
type cgoSymbolizerArg struct {
|
pc uintptr
|
file *byte
|
lineno uintptr
|
funcName *byte
|
entry uintptr
|
more uintptr
|
data uintptr
|
}
|
|
// cgoTraceback prints a traceback of callers.
|
func printCgoTraceback(callers *cgoCallers) {
|
if cgoSymbolizer == nil {
|
for _, c := range callers {
|
if c == 0 {
|
break
|
}
|
print("non-Go function at pc=", hex(c), "\n")
|
}
|
return
|
}
|
|
var arg cgoSymbolizerArg
|
for _, c := range callers {
|
if c == 0 {
|
break
|
}
|
printOneCgoTraceback(c, 0x7fffffff, &arg)
|
}
|
arg.pc = 0
|
callCgoSymbolizer(&arg)
|
}
|
|
// printOneCgoTraceback prints the traceback of a single cgo caller.
|
// This can print more than one line because of inlining.
|
// Returns the number of frames printed.
|
func printOneCgoTraceback(pc uintptr, max int, arg *cgoSymbolizerArg) int {
|
c := 0
|
arg.pc = pc
|
for {
|
if c > max {
|
break
|
}
|
callCgoSymbolizer(arg)
|
if arg.funcName != nil {
|
// Note that we don't print any argument
|
// information here, not even parentheses.
|
// The symbolizer must add that if appropriate.
|
println(gostringnocopy(arg.funcName))
|
} else {
|
println("non-Go function")
|
}
|
print("\t")
|
if arg.file != nil {
|
print(gostringnocopy(arg.file), ":", arg.lineno, " ")
|
}
|
print("pc=", hex(pc), "\n")
|
c++
|
if arg.more == 0 {
|
break
|
}
|
}
|
return c
|
}
|
|
// callCgoSymbolizer calls the cgoSymbolizer function.
|
func callCgoSymbolizer(arg *cgoSymbolizerArg) {
|
call := cgocall
|
if panicking > 0 || getg().m.curg != getg() {
|
// We do not want to call into the scheduler when panicking
|
// or when on the system stack.
|
call = asmcgocall
|
}
|
if msanenabled {
|
msanwrite(unsafe.Pointer(arg), unsafe.Sizeof(cgoSymbolizerArg{}))
|
}
|
call(cgoSymbolizer, noescape(unsafe.Pointer(arg)))
|
}
|
|
// cgoContextPCs gets the PC values from a cgo traceback.
|
func cgoContextPCs(ctxt uintptr, buf []uintptr) {
|
if cgoTraceback == nil {
|
return
|
}
|
call := cgocall
|
if panicking > 0 || getg().m.curg != getg() {
|
// We do not want to call into the scheduler when panicking
|
// or when on the system stack.
|
call = asmcgocall
|
}
|
arg := cgoTracebackArg{
|
context: ctxt,
|
buf: (*uintptr)(noescape(unsafe.Pointer(&buf[0]))),
|
max: uintptr(len(buf)),
|
}
|
if msanenabled {
|
msanwrite(unsafe.Pointer(&arg), unsafe.Sizeof(arg))
|
}
|
call(cgoTraceback, noescape(unsafe.Pointer(&arg)))
|
}
|
