forked from go-llvm/llgo
/
attribute.go
155 lines (141 loc) · 4.39 KB
/
attribute.go
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
// Copyright 2012 The llgo Authors.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package llgo
import (
"code.google.com/p/go.tools/go/types"
"github.com/axw/gollvm/llvm"
"go/ast"
"strings"
)
const AttributeCommentPrefix = "#llgo "
// Attribute represents an attribute associated with a
// global variable or function.
type Attribute interface {
Apply(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 {
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, ':')
key, value := line[:colon], line[colon+1:]
switch key {
case "linkage":
return parseLinkageAttribute(value)
case "name":
return nameAttribute(strings.TrimSpace(value))
case "attr":
return parseLLVMAttribute(strings.TrimSpace(value))
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 Value) {
global := v.(*LLVMValue).pointer.value
global.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 "linker_private":
result |= linkageAttribute(llvm.LinkerPrivateLinkage)
case "linker_private_weak":
result |= linkageAttribute(llvm.LinkerPrivateWeakLinkage)
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)
case "dllimport":
result |= linkageAttribute(llvm.DLLImportLinkage)
case "dllexport":
result |= linkageAttribute(llvm.DLLExportLinkage)
}
}
return result
}
type nameAttribute string
func (a nameAttribute) Apply(v Value) {
if _, isfunc := v.Type().(*types.Signature); isfunc {
fn := v.LLVMValue()
fn = llvm.ConstExtractValue(fn, []uint32{0})
fn.SetName(string(a))
} else {
global := v.(*LLVMValue).pointer.value
global.SetName(string(a))
}
}
func parseLLVMAttribute(value string) llvmAttribute {
var result llvmAttribute
value = strings.Replace(value, ",", " ", -1)
for _, field := range strings.Fields(value) {
switch strings.ToLower(field) {
case "noreturn":
result |= llvmAttribute(llvm.NoReturnAttribute)
case "nounwind":
result |= llvmAttribute(llvm.NoUnwindAttribute)
case "noinline":
result |= llvmAttribute(llvm.NoInlineAttribute)
case "alwaysinline":
result |= llvmAttribute(llvm.AlwaysInlineAttribute)
}
}
return result
}
type llvmAttribute llvm.Attribute
func (a llvmAttribute) Apply(v Value) {
if _, isfunc := v.Type().(*types.Signature); isfunc {
fn := v.LLVMValue()
fn = llvm.ConstExtractValue(fn, []uint32{0})
fn.AddFunctionAttr(llvm.Attribute(a))
} else {
v.LLVMValue().AddAttribute(llvm.Attribute(a))
}
}