go objw 源码
golang objw 代码
文件路径：/src/cmd/compile/internal/objw/objw.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package objw
import (
"cmd/compile/internal/base"
"cmd/compile/internal/bitvec"
"cmd/compile/internal/types"
"cmd/internal/obj"
)
// Uint8 writes an unsigned byte v into s at offset off,
// and returns the next unused offset (i.e., off+1).
func Uint8(s *obj.LSym, off int, v uint8) int {
return UintN(s, off, uint64(v), 1)
}
func Uint16(s *obj.LSym, off int, v uint16) int {
return UintN(s, off, uint64(v), 2)
}
func Uint32(s *obj.LSym, off int, v uint32) int {
return UintN(s, off, uint64(v), 4)
}
func Uintptr(s *obj.LSym, off int, v uint64) int {
return UintN(s, off, v, types.PtrSize)
}
// UintN writes an unsigned integer v of size wid bytes into s at offset off,
// and returns the next unused offset.
func UintN(s *obj.LSym, off int, v uint64, wid int) int {
if off&(wid-1) != 0 {
base.Fatalf("duintxxLSym: misaligned: v=%d wid=%d off=%d", v, wid, off)
}
s.WriteInt(base.Ctxt, int64(off), wid, int64(v))
return off + wid
}
func SymPtr(s *obj.LSym, off int, x *obj.LSym, xoff int) int {
off = int(types.Rnd(int64(off), int64(types.PtrSize)))
s.WriteAddr(base.Ctxt, int64(off), types.PtrSize, x, int64(xoff))
off += types.PtrSize
return off
}
func SymPtrWeak(s *obj.LSym, off int, x *obj.LSym, xoff int) int {
off = int(types.Rnd(int64(off), int64(types.PtrSize)))
s.WriteWeakAddr(base.Ctxt, int64(off), types.PtrSize, x, int64(xoff))
off += types.PtrSize
return off
}
func SymPtrOff(s *obj.LSym, off int, x *obj.LSym) int {
s.WriteOff(base.Ctxt, int64(off), x, 0)
off += 4
return off
}
func SymPtrWeakOff(s *obj.LSym, off int, x *obj.LSym) int {
s.WriteWeakOff(base.Ctxt, int64(off), x, 0)
off += 4
return off
}
func Global(s *obj.LSym, width int32, flags int16) {
if flags&obj.LOCAL != 0 {
s.Set(obj.AttrLocal, true)
flags &^= obj.LOCAL
}
base.Ctxt.Globl(s, int64(width), int(flags))
}
// Bitvec writes the contents of bv into s as sequence of bytes
// in little-endian order, and returns the next unused offset.
func BitVec(s *obj.LSym, off int, bv bitvec.BitVec) int {
// Runtime reads the bitmaps as byte arrays. Oblige.
for j := 0; int32(j) < bv.N; j += 8 {
word := bv.B[j/32]
off = Uint8(s, off, uint8(word>>(uint(j)%32)))
}
return off
}
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