if uvdelta == 0 && !first {
		return false
	}
	if uvdelta&1 != 0 {
		uvdelta = ^(uvdelta >> 1)
	} else {
		uvdelta >>= 1
	}
	vdelta := int32(uvdelta)
	pcdelta := t.readvarint(p) * t.quantum
	*pc += uint64(pcdelta)
	*val += vdelta
	return true
}

// pcvalue reports the value associated with the target pc.
// off is the offset to the beginning of the pc-value table,

Africa/Abidjan Africa/Accra Africa/Addis_Ababa Africa/Algiers Africa/Asmara Africa/Asmera Africa/Bamako Africa/Bangui Africa/Banjul Africa/Bissau Africa/Blantyre Africa/Brazzaville Africa/Bujumbura Africa/Cairo Africa/Casablanca Africa/Ceuta Africa/Conakry Africa/Dakar Africa/Dar_es_Salaam Africa/Djibouti Africa/Douala Africa/El_Aaiun Africa/Freetown Africa/Gaborone Africa/Harare Africa/Johannesburg Africa/Juba Africa/Kampala Africa/Khartoum Africa/Kigali Africa/Kinshasa Africa/Lagos Africa/Libreville...

		cgoCheckBits(src, typ.GCData, off, size)
		return
	}

	// The type has a GC program. Try to find GC bits somewhere else.
	for _, datap := range activeModules() {
		if cgoInRange(src, datap.data, datap.edata) {
			doff := uintptr(src) - datap.data
			cgoCheckBits(add(src, -doff), datap.gcdatamask.bytedata, off+doff, size)
			return
		}
		if cgoInRange(src, datap.bss, datap.ebss) {
			boff := uintptr(src) - datap.bss

	}

	f, err := pe.Open(objfile)
	if err != nil {
		t.Fatalf("pe.Open failed: %v", err)
	}
	defer f.Close()
	section := f.Section(".edata")
	if section == nil {
		t.Skip(".edata section is not present")
	}

	// TODO: deduplicate this struct from cmd/link/internal/ld/pe.go
	type IMAGE_EXPORT_DIRECTORY struct {
		_                 [2]uint32

			newattr(unit.DWInfo, dwarf.DW_AT_comp_dir, dwarf.DW_CLS_STRING, int64(len(compDir)), compDir)

			var peData []byte
			if producerExtra := d.ldr.Lookup(dwarf.CUInfoPrefix+"producer."+unit.Lib.Pkg, 0); producerExtra != 0 {
				peData = d.ldr.Data(producerExtra)
			}
			producer := "Go cmd/compile " + buildcfg.Version
			if len(peData) > 0 {
				// We put a semicolon before the flags to clearly

			if cgoIsGoPointer(pp) && !isPinned(pp) {
				panic(errorString(msg))
			}
		}
		return
	}

	for _, datap := range activeModules() {
		if cgoInRange(p, datap.data, datap.edata) || cgoInRange(p, datap.bss, datap.ebss) {
			// We have no way to know the size of the object.
			// We have to assume that it might contain a pointer.
			panic(errorString(msg))
		}

	ctxt.xdefine("runtime.etypes", sym.SRODATA, 0)
	ctxt.xdefine("runtime.noptrdata", sym.SNOPTRDATA, 0)
	ctxt.xdefine("runtime.enoptrdata", sym.SNOPTRDATA, 0)
	ctxt.xdefine("runtime.data", sym.SDATA, 0)
	ctxt.xdefine("runtime.edata", sym.SDATA, 0)
	ctxt.xdefine("runtime.bss", sym.SBSS, 0)
	ctxt.xdefine("runtime.ebss", sym.SBSS, 0)
	ctxt.xdefine("runtime.noptrbss", sym.SNOPTRBSS, 0)
	ctxt.xdefine("runtime.enoptrbss", sym.SNOPTRBSS, 0)

		{Address: 0x401595, File: file2C, Line: 6, IsStmt: true},
		{Address: 0x40159b, EndSequence: true},
	}
	files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}}

	testLineTable(t, want, files, peData(t, "testdata/line-gcc-win.bin"))
}

func TestLineELFClang(t *testing.T) {
	// Generated by:
	//   # clang --version | head -n1
	//   Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4)

	// TODO(mwhudson): dump datamask etc from all objects
	// data segment
	dumpint(tagData)
	dumpint(uint64(firstmoduledata.data))
	dumpmemrange(unsafe.Pointer(firstmoduledata.data), firstmoduledata.edata-firstmoduledata.data)
	dumpfields(firstmoduledata.gcdatamask)

	// bss segment
	dumpint(tagBSS)
	dumpint(uint64(firstmoduledata.bss))

Tornando al precedente esempio, **FastAPI**:

* Validerà che esiste un `item_id` nel percorso delle richieste `GET` e `PUT`.
* Validerà che `item_id` sia di tipo `int` per le richieste `GET` e `PUT`.
    * Se non lo è, il client vedrà un errore chiaro e utile.
* Controllerà se ci sia un parametro opzionale chiamato `q` (per esempio `http://127.0.0.1:8000/items/foo?q=somequery`) per le richieste `GET`.