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|
//go:build go1.16 && !go1.18
// +build go1.16,!go1.18
/*
* Copyright 2021 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 loader
import (
`unsafe`
)
type _Func struct {
entry uintptr // start pc
nameoff int32 // function name
args int32 // in/out args size
deferreturn uint32 // offset of start of a deferreturn call instruction from entry, if any.
pcsp uint32
pcfile uint32
pcln uint32
npcdata uint32
cuOffset uint32 // runtime.cutab offset of this function's CU
funcID uint8 // set for certain special runtime functions
_ [2]byte // pad
nfuncdata uint8 // must be last
argptrs uintptr
localptrs uintptr
}
type _FuncTab struct {
entry uintptr
funcoff uintptr
}
type _PCHeader struct {
magic uint32 // 0xFFFFFFFA
pad1, pad2 uint8 // 0,0
minLC uint8 // min instruction size
ptrSize uint8 // size of a ptr in bytes
nfunc int // number of functions in the module
nfiles uint // number of entries in the file tab.
funcnameOffset uintptr // offset to the funcnametab variable from _PCHeader
cuOffset uintptr // offset to the cutab variable from _PCHeader
filetabOffset uintptr // offset to the filetab variable from _PCHeader
pctabOffset uintptr // offset to the pctab varible from _PCHeader
pclnOffset uintptr // offset to the pclntab variable from _PCHeader
}
type _BitVector struct {
n int32 // # of bits
bytedata *uint8
}
type _PtabEntry struct {
name int32
typ int32
}
type _TextSection struct {
vaddr uintptr // prelinked section vaddr
length uintptr // section length
baseaddr uintptr // relocated section address
}
type _ModuleData struct {
pcHeader *_PCHeader
funcnametab []byte
cutab []uint32
filetab []byte
pctab []byte
pclntable []_Func
ftab []_FuncTab
findfunctab *_FindFuncBucket
minpc, maxpc uintptr
text, etext uintptr
noptrdata, enoptrdata uintptr
data, edata uintptr
bss, ebss uintptr
noptrbss, enoptrbss uintptr
end, gcdata, gcbss uintptr
types, etypes uintptr
textsectmap []_TextSection
typelinks []int32
itablinks []unsafe.Pointer
ptab []_PtabEntry
pluginpath string
pkghashes []struct{}
modulename string
modulehashes []struct{}
hasmain uint8
gcdatamask, gcbssmask _BitVector
typemap map[int32]unsafe.Pointer
bad bool
next *_ModuleData
}
type _FindFuncBucket struct {
idx uint32
subbuckets [16]byte
}
var modHeader = &_PCHeader {
magic : 0xfffffffa,
minLC : 1,
nfunc : 1,
ptrSize : 4 << (^uintptr(0) >> 63),
}
var findFuncTab = &_FindFuncBucket {
idx: 1,
}
func makePCtab(fp int) []byte {
return append([]byte{0}, encodeVariant((fp + 1) << 1)...)
}
func registerFunction(name string, pc uintptr, textSize uintptr, fp int, args int, size uintptr, argPtrs []bool, localPtrs []bool) {
mod := new(_ModuleData)
minpc := pc
maxpc := pc + size
// cache arg and local stackmap
argptrs, localptrs := cacheStackmap(argPtrs, localPtrs, mod)
/* function entry */
lnt := []_Func {{
entry : pc,
nameoff : 1,
args : int32(args),
pcsp : 1,
nfuncdata : 2,
argptrs : uintptr(argptrs),
localptrs : uintptr(localptrs),
}}
/* function table */
tab := []_FuncTab {
{entry: pc},
{entry: pc},
{entry: maxpc},
}
/* module data */
*mod = _ModuleData {
pcHeader : modHeader,
funcnametab : append(append([]byte{0}, name...), 0),
pctab : append(makePCtab(fp), encodeVariant(int(size))...),
pclntable : lnt,
ftab : tab,
findfunctab : findFuncTab,
minpc : minpc,
maxpc : maxpc,
modulename : name,
gcdata: uintptr(unsafe.Pointer(&emptyByte)),
gcbss: uintptr(unsafe.Pointer(&emptyByte)),
}
/* verify and register the new module */
moduledataverify1(mod)
registerModule(mod)
}
|
