}

		// Mark the stack bound check and morestack call async nonpreemptible.
		// If we get preempted here, when resumed the preemption request is
		// cleared, but we'll still call morestack, which will double the stack
		// unnecessarily. See issue #35470.
		p = ctxt.StartUnsafePoint(p, newprog)
	} else if framesize <= abi.StackBig {
		// large stack: SP-framesize <= stackguard-StackSmall

		}
		if gotLog == "" {
			if d > 0 {
				t.Logf("wanted a stack trace logged; got nothing after %v", d)
			}
			return false
		}
		if !strings.Contains(gotLog, "created by ") && strings.Count(gotLog, "\n") < 6 {
			if d > 0 {
				t.Logf("output doesn't look like a panic stack trace after %v. Got: %s", d, gotLog)
			}
			return false
		}
		return true
	})
}

package runtime

import (
	"internal/runtime/atomic"
	"unsafe"
)

// Trace state.

// trace is global tracing context.
var trace struct {
	// trace.lock must only be acquired on the system stack where
	// stack splits cannot happen while it is held.
	lock mutex

	// Trace buffer management.
	//
	// First we check the empty list for any free buffers. If not, buffers

	}

	// Common individual register masks
	var (
		gp         = buildReg("R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R23 R24 R25 R26 R27 R28 R29 R31") // R1 is LR, R2 is thread pointer, R3 is stack pointer, R22 is g, R30 is REGTMP
		gpg        = gp | buildReg("g")
		gpsp       = gp | buildReg("SP")
		gpspg      = gpg | buildReg("SP")
		gpspsbg    = gpspg | buildReg("SB")

	}
	if !strings.Contains(o, "Exception 0xbad") {
		t.Fatalf("No stack trace: %v", o)
	}
}

func TestZeroDivisionException(t *testing.T) {
	o := runTestProg(t, "testprog", "ZeroDivisionException")
	if !strings.Contains(o, "panic: runtime error: integer divide by zero") {
		t.Fatalf("No stack trace: %v", o)
	}
}

func TestWERDialogue(t *testing.T) {

// needing different casings of a file path, but it would be fairly illegible
// to most programmers when those paths appeared in the file system
// (including in file paths in compiler errors and stack traces)
// in web server logs, and so on. Instead, we want a safe escaped form that
// leaves most paths unaltered.
//
// The safe escaped form is to replace every uppercase letter

		// n is a readonly global; use it directly.
		value = n
	case conv.Esc() == ir.EscNone && fromType.Size() <= 1024:
		// n does not escape. Use a stack temporary initialized to n.
		value = typecheck.TempAt(base.Pos, ir.CurFunc, fromType)
		init.Append(typecheck.Stmt(ir.NewAssignStmt(base.Pos, value, n)))
	}
	if value != nil {
		// The interface data word is &value.

					}) {
						// stk is a call stack that is still on the user stack when
						// it calls runtime.unlock. Add the extra function that
						// we'll see, when the static lock ranking implementation of
						// runtime.unlockWithRank switches to the system stack.
						stk = append([]string{"runtime.unlockWithRank"}, stk...)
					}
				}

	return unsafe.String((*byte)(p), n)
}

// stringDataOnStack reports whether the string's data is
// stored on the current goroutine's stack.
func stringDataOnStack(s string) bool {
	ptr := uintptr(unsafe.Pointer(unsafe.StringData(s)))
	stk := getg().stack
	return stk.lo <= ptr && ptr < stk.hi
}

func rawstringtmp(buf *tmpBuf, l int) (s string, b []byte) {
	if buf != nil && l <= len(buf) {
		b = buf[:l]

	cv := mkCounterVarName(len(f.pkg.counterLengths))
	f.fn.counterVar = cv
}

func (f *File) postFunc(fn ast.Node, funcname string, flit bool, body *ast.BlockStmt) {

	// Tack on single counter write if we are in "perfunc" mode.
	singleCtr := ""
	if pkgconfig.Granularity == "perfunc" {
		singleCtr = "; " + f.newCounter(fn.Pos(), fn.Pos(), 1)
	}