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call.go
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call.go
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package hir
import (
`fmt`
`runtime`
`unsafe`
`github.com/chenzhuoyu/jitkit/internal/abi`
`github.com/chenzhuoyu/jitkit/internal/rt`
)
type (
CallType uint8
)
const (
CCall CallType = iota
GCall
ICall
)
type CallState interface {
Gr(id GenericRegister) uint64
Pr(id PointerRegister) unsafe.Pointer
SetGr(id GenericRegister, val uint64)
SetPr(id PointerRegister, val unsafe.Pointer)
}
type CallHandle struct {
Id int
Slot int
Type CallType
Func unsafe.Pointer
proxy func(CallContext)
}
func (self *CallHandle) Name() string {
return runtime.FuncForPC(uintptr(self.Func)).Name()
}
func (self *CallHandle) Call(r CallState, p *Ir) {
self.proxy(CallContext {
repo: r,
kind: self.Type,
argc: p.An,
retc: p.Rn,
argv: p.Ar,
retv: p.Rr,
itab: p.Ps,
data: p.Pd,
})
}
func (self *CallHandle) String() string {
return fmt.Sprintf("*%#x[%s]", self.Func, self.Name())
}
type CallContext struct {
kind CallType
repo CallState
itab PointerRegister
data PointerRegister
argc uint8
retc uint8
argv [8]uint8
retv [8]uint8
}
func (self CallContext) Au(i int) uint64 {
if p := self.argv[i]; p &ArgPointer != 0 {
panic("invoke: invalid int argument")
} else {
return self.repo.Gr(GenericRegister(p & ArgMask))
}
}
func (self CallContext) Ap(i int) unsafe.Pointer {
if p := self.argv[i]; p &ArgPointer == 0 {
panic("invoke: invalid pointer argument")
} else {
return self.repo.Pr(PointerRegister(p & ArgMask))
}
}
func (self CallContext) Ru(i int, v uint64) {
if p := self.retv[i]; p &ArgPointer != 0 {
panic("invoke: invalid int return value")
} else {
self.repo.SetGr(GenericRegister(p &ArgMask), v)
}
}
func (self CallContext) Rp(i int, v unsafe.Pointer) {
if p := self.retv[i]; p &ArgPointer == 0 {
panic("invoke: invalid pointer return value")
} else {
self.repo.SetPr(PointerRegister(p &ArgMask), v)
}
}
func (self CallContext) Itab() *rt.GoItab {
if self.kind != ICall {
panic("invoke: itab is not available")
} else {
return (*rt.GoItab)(self.repo.Pr(self.itab))
}
}
func (self CallContext) Data() unsafe.Pointer {
if self.kind != ICall {
panic("invoke: data is not available")
} else {
return self.repo.Pr(self.data)
}
}
func (self CallContext) Verify(args string, rets string) bool {
return self.verifySeq(args, self.argc, self.argv) && self.verifySeq(rets, self.retc, self.retv)
}
func (self CallContext) verifySeq(s string, n uint8, v [8]uint8) bool {
nb := int(n)
ne := len(s)
/* sanity check */
if ne > len(v) {
panic("invoke: invalid descriptor")
}
/* check for value count */
if nb != ne {
return false
}
/* check for every argument */
for i := 0; i < nb; i++ {
switch s[i] {
case 'i' : if v[i] &ArgPointer != 0 { return false }
case '*' : if v[i] &ArgPointer == 0 { return false }
default : panic("invoke: invalid descriptor char: " + s[i:i + 1])
}
}
/* all checked ok */
return true
}
var (
funcTab []*CallHandle
)
func LookupCall(id int64) *CallHandle {
if id < 0 || id >= int64(len(funcTab)) {
panic("invalid function ID")
} else {
return funcTab[id]
}
}
func RegisterICall(mt rt.Method, proxy func(CallContext)) (h *CallHandle) {
h = new(CallHandle)
h.Id = len(funcTab)
h.Type = ICall
h.Slot = abi.ABI.RegisterMethod(h.Id, mt)
h.proxy = proxy
funcTab = append(funcTab, h)
return
}
func RegisterGCall(fn interface{}, proxy func(CallContext)) (h *CallHandle) {
h = new(CallHandle)
h.Id = len(funcTab)
h.Type = GCall
h.Func = abi.ABI.RegisterFunction(h.Id, fn)
h.proxy = proxy
funcTab = append(funcTab, h)
return
}
func RegisterCCall(fn unsafe.Pointer, proxy func(CallContext)) (h *CallHandle) {
h = new(CallHandle)
h.Id = len(funcTab)
h.Type = CCall
h.Func = fn
h.proxy = proxy
funcTab = append(funcTab, h)
return
}