}

// tracebackPCs populates pcBuf with the return addresses for each frame from u
// and returns the number of PCs written to pcBuf. The returned PCs correspond
// to "logical frames" rather than "physical frames"; that is if A is inlined
// into B, this will still return a PCs for both A and B. This also includes PCs
// generated by the cgo unwinder, if one is registered.
//
// If skip != 0, this skips this many logical frames.
//

   https://docs.google.com/document/d/131vjr4DH6JFnb-blm_uRdaC0_Nv3OUwjEY5qVCxCup4/edit#heading=h.mjo1bish3xni

   PCs:

   Wasm doesn't have PCs in the normal sense that you can jump
   to or call to. Instead, we simulate these PCs using our own construct.

   A PC in the Wasm implementation is the combination of a function
   ID and a block ID within that function. The function ID is an index

	case debugLogPC:
		printDebugLogPC(uintptr(r.uvarint()), false)

	case debugLogTraceback:
		n := int(r.uvarint())
		for i := 0; i < n; i++ {
			print("\n\t")
			// gentraceback PCs are always return PCs.
			// Convert them to call PCs.
			//
			// TODO(austin): Expand inlined frames.
			printDebugLogPC(uintptr(r.uvarint()), true)
		}
	}

	return true
}

// printDebugLog prints the debug log.

//
// To translate these PCs into symbolic information such as function
// names and line numbers, use [CallersFrames]. CallersFrames accounts
// for inlined functions and adjusts the return program counters into
// call program counters. Iterating over the returned slice of PCs
// directly is discouraged, as is using [FuncForPC] on any of the
// returned PCs, since these cannot account for inlining or return

			EnvironmentVariables: map[string]string{
				fmt.Sprintf("VAR_%d", i): fmt.Sprint(i),
			},
		}))
	}
	pcs := model.GetProxyConfigs(store, m)
	env := model.Environment{
		Watcher:     mesh.NewFixedWatcher(m),
		ConfigStore: store,
	}
	env.SetPushContext(&model.PushContext{
		ProxyConfigs: pcs,
	})
	watcher, err := NewFileWatcher(configFile, valuesFile)
	if err != nil {

		// different units.
		sval := d.ldr.SymValue(sym)
		u0val := d.ldr.SymValue(loader.Sym(unit.Textp[0]))
		if prevUnit != unit {
			unit.PCs = append(unit.PCs, dwarf.Range{Start: sval - u0val})
			prevUnit = unit
		}
		unit.PCs[len(unit.PCs)-1].End = sval - u0val + int64(len(d.ldr.Data(sym)))
	}
}

func movetomodule(ctxt *Link, parent *dwarf.DWDie) {
	die := ctxt.runtimeCU.DWInfo.Child

			return nil, err
		}
		if e == nil || e.Tag == 0 {
			return nil, ErrUnknownPC
		}
		ranges, err := r.d.Ranges(e)
		if err != nil {
			return nil, err
		}
		for _, pcs := range ranges {
			if pcs[0] <= pc && pc < pcs[1] {
				return e, nil
			}
		}
		unit++
	}
	return nil, ErrUnknownPC
}

// Ranges returns the PC ranges covered by e, a slice of [low,high) pairs.

func (m *Matcher) stack(w Writer) bool {
	const maxStack = 16
	var stk [maxStack]uintptr
	n := runtime.Callers(2, stk[:])
	// caller #2 is not for printing; need it to normalize PCs if ASLR.
	if n <= 1 {
		return false
	}

	base := stk[0]
	// normalize PCs
	for i := range stk[:n] {
		stk[i] -= base
	}

	h := Hash(stk[:n])
	if m.ShouldPrint(h) {
		var d *dedup
		for {
			d = m.dedup.Load()

// stack ID for it.
//
// It then returns a traceArg representing that stack which may be
// passed to write.
func (tl traceLocker) startPC(pc uintptr) traceArg {
	// +PCQuantum because makeTraceFrame expects return PCs and subtracts PCQuantum.
	return traceArg(trace.stackTab[tl.gen%2].put([]uintptr{
		logicalStackSentinel,
		startPCForTrace(pc) + sys.PCQuantum,
	}))
}

	// - at least one row has the correct line number (8)
	pcs := make(map[uint64]bool)
	line8seen := false
	for _, r := range rows {
		pcs[r.Address] = true
		if r.Line == 8 {
			line8seen = true
		}
	}
	failed := false
	if len(pcs) < 2 {
		failed = true
		t.Errorf("not enough line table rows for main.singleInstruction (got %d, wanted > 1", len(pcs))
	}
	if !line8seen {
		failed = true