1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// Copyright 2013 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 obj
import (
"cmd/internal/objabi"
"fmt"
"strings"
)
type Plist struct {
Firstpc *Prog
Curfn interface{} // holds a *gc.Node, if non-nil
}
// ProgAlloc is a function that allocates Progs.
// It is used to provide access to cached/bulk-allocated Progs to the assemblers.
type ProgAlloc func() *Prog
func Flushplist(ctxt *Link, plist *Plist, newprog ProgAlloc) {
// Build list of symbols, and assign instructions to lists.
var curtext *LSym
var etext *Prog
var text []*LSym
var plink *Prog
for p := plist.Firstpc; p != nil; p = plink {
if ctxt.Debugasm && ctxt.Debugvlog {
fmt.Printf("obj: %v\n", p)
}
plink = p.Link
p.Link = nil
switch p.As {
case AEND:
continue
case ATEXT:
s := p.From.Sym
if s == nil {
// func _() { }
curtext = nil
continue
}
text = append(text, s)
etext = p
curtext = s
continue
case AFUNCDATA:
// Rewrite reference to go_args_stackmap(SB) to the Go-provided declaration information.
if curtext == nil { // func _() {}
continue
}
if p.To.Sym.Name == "go_args_stackmap" {
if p.From.Type != TYPE_CONST || p.From.Offset != objabi.FUNCDATA_ArgsPointerMaps {
ctxt.Diag("FUNCDATA use of go_args_stackmap(SB) without FUNCDATA_ArgsPointerMaps")
}
p.To.Sym = ctxt.LookupDerived(curtext, curtext.Name+".args_stackmap")
}
}
if curtext == nil {
etext = nil
continue
}
etext.Link = p
etext = p
}
if newprog == nil {
newprog = ctxt.NewProg
}
// Add reference to Go arguments for C or assembly functions without them.
for _, s := range text {
if !strings.HasPrefix(s.Name, "\"\".") {
continue
}
found := false
for p := s.Func.Text; p != nil; p = p.Link {
if p.As == AFUNCDATA && p.From.Type == TYPE_CONST && p.From.Offset == objabi.FUNCDATA_ArgsPointerMaps {
found = true
break
}
}
if !found {
p := Appendp(s.Func.Text, newprog)
p.As = AFUNCDATA
p.From.Type = TYPE_CONST
p.From.Offset = objabi.FUNCDATA_ArgsPointerMaps
p.To.Type = TYPE_MEM
p.To.Name = NAME_EXTERN
p.To.Sym = ctxt.LookupDerived(s, s.Name+".args_stackmap")
}
}
// Turn functions into machine code images.
for _, s := range text {
mkfwd(s)
linkpatch(ctxt, s, newprog)
ctxt.Arch.Preprocess(ctxt, s, newprog)
ctxt.Arch.Assemble(ctxt, s, newprog)
linkpcln(ctxt, s)
ctxt.populateDWARF(plist.Curfn, s)
}
}
func (ctxt *Link) InitTextSym(s *LSym, flag int) {
if s == nil {
// func _() { }
return
}
if s.Func != nil {
ctxt.Diag("InitTextSym double init for %s", s.Name)
}
s.Func = new(FuncInfo)
if s.Func.Text != nil {
ctxt.Diag("duplicate TEXT for %s", s.Name)
}
if s.OnList() {
ctxt.Diag("symbol %s listed multiple times", s.Name)
}
s.Set(AttrOnList, true)
s.Set(AttrDuplicateOK, flag&DUPOK != 0)
s.Set(AttrNoSplit, flag&NOSPLIT != 0)
s.Set(AttrReflectMethod, flag&REFLECTMETHOD != 0)
s.Set(AttrWrapper, flag&WRAPPER != 0)
s.Set(AttrNeedCtxt, flag&NEEDCTXT != 0)
s.Set(AttrNoFrame, flag&NOFRAME != 0)
s.Type = objabi.STEXT
ctxt.Text = append(ctxt.Text, s)
// Set up DWARF entries for s.
info, loc, ranges := ctxt.dwarfSym(s)
info.Type = objabi.SDWARFINFO
info.Set(AttrDuplicateOK, s.DuplicateOK())
if loc != nil {
loc.Type = objabi.SDWARFLOC
loc.Set(AttrDuplicateOK, s.DuplicateOK())
ctxt.Data = append(ctxt.Data, loc)
}
ranges.Type = objabi.SDWARFRANGE
ranges.Set(AttrDuplicateOK, s.DuplicateOK())
ctxt.Data = append(ctxt.Data, info, ranges)
// Set up the function's gcargs and gclocals.
// They will be filled in later if needed.
gcargs := &s.Func.GCArgs
gcargs.Set(AttrDuplicateOK, true)
gcargs.Type = objabi.SRODATA
gclocals := &s.Func.GCLocals
gclocals.Set(AttrDuplicateOK, true)
gclocals.Type = objabi.SRODATA
}
func (ctxt *Link) Globl(s *LSym, size int64, flag int) {
if s.SeenGlobl() {
fmt.Printf("duplicate %v\n", s)
}
s.Set(AttrSeenGlobl, true)
if s.OnList() {
ctxt.Diag("symbol %s listed multiple times", s.Name)
}
s.Set(AttrOnList, true)
ctxt.Data = append(ctxt.Data, s)
s.Size = size
if s.Type == 0 {
s.Type = objabi.SBSS
}
if flag&DUPOK != 0 {
s.Set(AttrDuplicateOK, true)
}
if flag&RODATA != 0 {
s.Type = objabi.SRODATA
} else if flag&NOPTR != 0 {
if s.Type == objabi.SDATA {
s.Type = objabi.SNOPTRDATA
} else {
s.Type = objabi.SNOPTRBSS
}
} else if flag&TLSBSS != 0 {
s.Type = objabi.STLSBSS
}
}
|