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
|
//===- attribute.go - attribute processor ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file processes llgo and //extern attributes.
//
//===----------------------------------------------------------------------===//
package irgen
import (
"fmt"
"go/ast"
"llvm.org/llvm/bindings/go/llvm"
"strings"
)
const AttributeCommentPrefix = "#llgo "
// Attribute represents an attribute associated with a
// global variable or function.
type Attribute interface {
Apply(llvm.Value)
}
// parseAttribute parses zero or more #llgo comment attributes associated with
// a global variable or function. The comment group provided will be processed
// one line at a time using parseAttribute.
func parseAttributes(doc *ast.CommentGroup) []Attribute {
var attributes []Attribute
if doc == nil {
return attributes
}
for _, comment := range doc.List {
if strings.HasPrefix(comment.Text, "//extern ") {
nameattr := nameAttribute(strings.TrimSpace(comment.Text[9:]))
attributes = append(attributes, nameattr)
continue
}
text := comment.Text[2:]
if strings.HasPrefix(comment.Text, "/*") {
text = text[:len(text)-2]
}
attr := parseAttribute(strings.TrimSpace(text))
if attr != nil {
attributes = append(attributes, attr)
}
}
return attributes
}
// parseAttribute parses a single #llgo comment attribute associated with
// a global variable or function. The string provided will be parsed
// if it begins with AttributeCommentPrefix, otherwise nil is returned.
func parseAttribute(line string) Attribute {
if !strings.HasPrefix(line, AttributeCommentPrefix) {
return nil
}
line = strings.TrimSpace(line[len(AttributeCommentPrefix):])
colon := strings.IndexRune(line, ':')
var key, value string
if colon == -1 {
key = line
} else {
key, value = line[:colon], line[colon+1:]
}
switch key {
case "linkage":
return parseLinkageAttribute(value)
case "name":
return nameAttribute(strings.TrimSpace(value))
case "thread_local":
return tlsAttribute{}
default:
// FIXME decide what to do here. return error? log warning?
panic("unknown attribute key: " + key)
}
return nil
}
type linkageAttribute llvm.Linkage
func (a linkageAttribute) Apply(v llvm.Value) {
v.SetLinkage(llvm.Linkage(a))
}
func parseLinkageAttribute(value string) linkageAttribute {
var result linkageAttribute
value = strings.Replace(value, ",", " ", -1)
for _, field := range strings.Fields(value) {
switch strings.ToLower(field) {
case "private":
result |= linkageAttribute(llvm.PrivateLinkage)
case "internal":
result |= linkageAttribute(llvm.InternalLinkage)
case "available_externally":
result |= linkageAttribute(llvm.AvailableExternallyLinkage)
case "linkonce":
result |= linkageAttribute(llvm.LinkOnceAnyLinkage)
case "common":
result |= linkageAttribute(llvm.CommonLinkage)
case "weak":
result |= linkageAttribute(llvm.WeakAnyLinkage)
case "appending":
result |= linkageAttribute(llvm.AppendingLinkage)
case "extern_weak":
result |= linkageAttribute(llvm.ExternalWeakLinkage)
case "linkonce_odr":
result |= linkageAttribute(llvm.LinkOnceODRLinkage)
case "weak_odr":
result |= linkageAttribute(llvm.WeakODRLinkage)
case "external":
result |= linkageAttribute(llvm.ExternalLinkage)
}
}
return result
}
type nameAttribute string
func (a nameAttribute) Apply(v llvm.Value) {
if !v.IsAFunction().IsNil() {
name := string(a)
curr := v.GlobalParent().NamedFunction(name)
if !curr.IsNil() && curr != v {
if curr.BasicBlocksCount() != 0 {
panic(fmt.Errorf("Want to take the name %s from a function that has a body!", name))
}
curr.SetName(name + "_llgo_replaced")
curr.ReplaceAllUsesWith(llvm.ConstBitCast(v, curr.Type()))
}
v.SetName(name)
} else {
v.SetName(string(a))
}
}
type tlsAttribute struct{}
func (tlsAttribute) Apply(v llvm.Value) {
v.SetThreadLocal(true)
}
|
GitWeb