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//go:build !go1.17
// +build !go1.17
/*
* Copyright 2022 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package abi
import (
`fmt`
`reflect`
`runtime`
. `github.com/chenzhuoyu/iasm/x86_64`
)
func ReservedRegs(callc bool) []Register {
return nil
}
func salloc(p []Parameter, sp uint32, vt reflect.Type) (uint32, []Parameter) {
switch vt.Kind() {
case reflect.Bool : return sp + 8, append(p, mkStack(reflect.TypeOf(false), sp))
case reflect.Int : return sp + 8, append(p, mkStack(intType, sp))
case reflect.Int8 : return sp + 8, append(p, mkStack(reflect.TypeOf(int8(0)), sp))
case reflect.Int16 : return sp + 8, append(p, mkStack(reflect.TypeOf(int16(0)), sp))
case reflect.Int32 : return sp + 8, append(p, mkStack(reflect.TypeOf(int32(0)), sp))
case reflect.Int64 : return sp + 8, append(p, mkStack(reflect.TypeOf(int64(0)), sp))
case reflect.Uint : return sp + 8, append(p, mkStack(reflect.TypeOf(uint(0)), sp))
case reflect.Uint8 : return sp + 8, append(p, mkStack(reflect.TypeOf(uint8(0)), sp))
case reflect.Uint16 : return sp + 8, append(p, mkStack(reflect.TypeOf(uint16(0)), sp))
case reflect.Uint32 : return sp + 8, append(p, mkStack(reflect.TypeOf(uint32(0)), sp))
case reflect.Uint64 : return sp + 8, append(p, mkStack(reflect.TypeOf(uint64(0)), sp))
case reflect.Uintptr : return sp + 8, append(p, mkStack(reflect.TypeOf(uintptr(0)), sp))
case reflect.Float32 : return sp + 8, append(p, mkStack(reflect.TypeOf(float32(0)), sp))
case reflect.Float64 : return sp + 8, append(p, mkStack(reflect.TypeOf(float64(0)), sp))
case reflect.Complex64 : panic("abi: go116: not implemented: complex64")
case reflect.Complex128 : panic("abi: go116: not implemented: complex128")
case reflect.Array : panic("abi: go116: not implemented: arrays")
case reflect.Chan : return sp + 8, append(p, mkStack(reflect.TypeOf((chan int)(nil)), sp))
case reflect.Func : return sp + 8, append(p, mkStack(reflect.TypeOf((func())(nil)), sp))
case reflect.Map : return sp + 8, append(p, mkStack(reflect.TypeOf((map[int]int)(nil)), sp))
case reflect.Ptr : return sp + 8, append(p, mkStack(reflect.TypeOf((*int)(nil)), sp))
case reflect.UnsafePointer : return sp + 8, append(p, mkStack(ptrType, sp))
case reflect.Interface : return sp + 16, append(p, mkStack(ptrType, sp), mkStack(ptrType, sp + 8))
case reflect.Slice : return sp + 24, append(p, mkStack(ptrType, sp), mkStack(intType, sp + 8), mkStack(intType, sp + 16))
case reflect.String : return sp + 16, append(p, mkStack(ptrType, sp), mkStack(intType, sp + 8))
case reflect.Struct : panic("abi: go116: not implemented: structs")
default : panic("abi: invalid value type")
}
}
func NewFunctionLayout(ft reflect.Type) FunctionLayout {
var sp uint32
var fn FunctionLayout
/* assign every arguments */
for i := 0; i < ft.NumIn(); i++ {
sp, fn.Args = salloc(fn.Args, sp, ft.In(i))
}
/* assign every return value */
for i := 0; i < ft.NumOut(); i++ {
sp, fn.Rets = salloc(fn.Rets, sp, ft.Out(i))
}
/* update function ID and stack pointer */
fn.FP = sp
return fn
}
func (self *Frame) emitExchangeArgs(p *Program) {
iregArgs, xregArgs := 0, 0
for _, v := range self.desc.Args {
if v.IsFloat != notFloatKind {
xregArgs += 1
} else {
iregArgs += 1
}
}
if iregArgs > len(iregOrderC) {
panic("too many arguments, only support at most 6 integer arguments now")
}
if xregArgs > len(xregOrderC) {
panic("too many arguments, only support at most 8 float arguments now")
}
ic, xc := iregArgs, xregArgs
for i := 0; i < len(self.desc.Args); i++ {
arg := self.desc.Args[i]
if arg.IsFloat == floatKind64 {
p.MOVSD(self.argv(i), xregOrderC[xregArgs - xc])
xc -= 1
} else if arg.IsFloat == floatKind32 {
p.MOVSS(self.argv(i), xregOrderC[xregArgs - xc])
xc -= 1
} else {
p.MOVQ(self.argv(i), iregOrderC[iregArgs - ic])
ic -= 1
}
}
}
func (self *Frame) emitStackCheck(p *Program, to *Label, maxStack uintptr) {
// get the current goroutine
switch runtime.GOOS {
case "linux" : p.MOVQ(Abs(-8), R14).FS()
case "darwin" : p.MOVQ(Abs(0x30), R14).GS()
case "windows": break // windows always stores G pointer at R14
default : panic("unsupported operating system")
}
// check the stack guard
p.LEAQ(Ptr(RSP, -int32(self.Size() + uint32(maxStack))), RAX)
p.CMPQ(Ptr(R14, _G_stackguard0), RAX)
p.JBE(to)
}
func (self *Frame) StackCheckTextSize() uint32 {
p := DefaultArch.CreateProgram()
// get the current goroutine
switch runtime.GOOS {
case "linux" : p.MOVQ(Abs(-8), R14).FS()
case "darwin" : p.MOVQ(Abs(0x30), R14).GS()
case "windows": break // windows always stores G pointer at R14
default : panic("unsupported operating system")
}
// check the stack guard
p.LEAQ(Ptr(RSP, -int32(self.Size())), RAX)
p.CMPQ(Ptr(R14, _G_stackguard0), RAX)
l := CreateLabel("")
p.Link(l)
p.JBE(l)
return uint32(len(p.Assemble(0)))
}
func (self *Frame) emitExchangeRets(p *Program) {
if len(self.desc.Rets) > 1 {
panic("too many results, only support one result now")
}
// store result
if len(self.desc.Rets) ==1 {
if self.desc.Rets[0].IsFloat == floatKind64 {
p.MOVSD(xregOrderC[0], self.retv(0))
} else if self.desc.Rets[0].IsFloat == floatKind32 {
p.MOVSS(xregOrderC[0], self.retv(0))
} else {
p.MOVQ(RAX, self.retv(0))
}
}
}
func (self *Frame) emitRestoreRegs(p *Program) {
// load reserved registers
for i, r := range ReservedRegs(self.ccall) {
switch r.(type) {
case Register64:
p.MOVQ(self.resv(i), r)
case XMMRegister:
p.MOVSD(self.resv(i), r)
default:
panic(fmt.Sprintf("unsupported register type %t to reserve", r))
}
}
}
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