This repository was archived by the owner on Jun 24, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2k
Expand file tree
/
Copy pathsettings.rb
More file actions
248 lines (212 loc) · 7.55 KB
/
settings.rb
File metadata and controls
248 lines (212 loc) · 7.55 KB
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
# Copyright (C) 2011 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
require "config"
require "ast"
require "backends"
require "parser"
require "transform"
#
# computeSettingsCombinations(ast) -> settingsCombiations
#
# Computes an array of settings maps, where a settings map constitutes
# a configuration for the assembly code being generated. The map
# contains key value pairs where keys are settings names (strings) and
# the values are booleans (true for enabled, false for disabled).
#
def computeSettingsCombinations(ast)
settingsCombinations = []
def settingsCombinator(settingsCombinations, mapSoFar, remaining)
if remaining.empty?
settingsCombinations << mapSoFar
return
end
newMap = mapSoFar.dup
newMap[remaining[0]] = true
settingsCombinator(settingsCombinations, newMap, remaining[1..-1])
newMap = mapSoFar.dup
newMap[remaining[0]] = false
settingsCombinator(settingsCombinations, newMap, remaining[1..-1])
end
nonBackendSettings = ast.filter(Setting).uniq.collect{ |v| v.name }
nonBackendSettings.delete_if {
| setting |
isBackend? setting
}
allBackendsFalse = {}
BACKENDS.each {
| backend |
allBackendsFalse[backend] = false
}
# This will create entries for invalid backends. That's fine. It's necessary
# because it ensures that generate_offsets_extractor (which knows about valid
# backends) has settings indices that are compatible with what asm will see
# (asm doesn't know about valid backends).
BACKENDS.each {
| backend |
map = allBackendsFalse.clone
map[backend] = true
settingsCombinator(settingsCombinations, map, nonBackendSettings)
}
settingsCombinations
end
#
# forSettings(concreteSettings, ast) {
# | concreteSettings, lowLevelAST, backend | ... }
#
# Determines if the settings combination is valid, and if so, calls
# the block with the information you need to generate code.
#
def forSettings(concreteSettings, ast)
# Check which architectures this combinator claims to support.
selectedBackend = nil
BACKENDS.each {
| backend |
if concreteSettings[backend]
raise if selectedBackend
selectedBackend = backend
end
}
return unless isValidBackend? selectedBackend
# Resolve the AST down to a low-level form (no macros or conditionals).
lowLevelAST = ast.resolveSettings(concreteSettings)
yield concreteSettings, lowLevelAST, selectedBackend
end
#
# forEachValidSettingsCombination(ast) {
# | concreteSettings, ast, backend, index | ... }
#
# forEachValidSettingsCombination(ast, settingsCombinations) {
# | concreteSettings, ast, backend, index | ... }
#
# Executes the given block for each valid settings combination in the
# settings map. The ast passed into the block is resolved
# (ast.resolve) against the settings.
#
# The first form will call computeSettingsCombinations(ast) for you.
#
def forEachValidSettingsCombination(ast, *optionalSettingsCombinations)
raise if optionalSettingsCombinations.size > 1
if optionalSettingsCombinations.empty?
settingsCombinations = computeSettingsCombinations(ast)
else
settingsCombinations = optionalSettingsCombiations[0]
end
settingsCombinations.each_with_index {
| concreteSettings, index |
forSettings(concreteSettings, ast) {
| concreteSettings_, lowLevelAST, backend |
yield concreteSettings, lowLevelAST, backend, index
}
}
end
#
# cppSettingsTest(concreteSettings)
#
# Returns the C++ code used to test if we are in a configuration that
# corresponds to the given concrete settings.
#
def cppSettingsTest(concreteSettings)
"#if " + concreteSettings.to_a.collect{
| pair |
(if pair[1]
""
else
"!"
end) + "OFFLINE_ASM_" + pair[0]
}.join(" && ")
end
#
# isASTErroneous(ast)
#
# Tests to see if the AST claims that there is an error - i.e. if the
# user's code, after settings resolution, has Error nodes.
#
def isASTErroneous(ast)
not ast.demacroify({}).filter(Error).empty?
end
#
# assertConfiguration(concreteSettings)
#
# Emits a check that asserts that we're using the given configuration.
#
def assertConfiguration(concreteSettings)
$output.puts cppSettingsTest(concreteSettings)
$output.puts "#else"
$output.puts "#error \"Configuration mismatch.\""
$output.puts "#endif"
end
#
# emitCodeInConfiguration(concreteSettings, ast, backend) {
# | concreteSettings, ast, backend | ... }
#
# Emits all relevant guards to see if the configuration holds and
# calls the block if the configuration is not erroneous.
#
def emitCodeInConfiguration(concreteSettings, ast, backend)
Label.resetReferenced
if !$emitWinAsm
$output.puts cppSettingsTest(concreteSettings)
else
if backend == "X86_WIN"
$output.puts ".MODEL FLAT, C"
end
$output.puts "INCLUDE #{File.basename($output.path)}.sym"
$output.puts "_TEXT SEGMENT"
end
if isASTErroneous(ast)
$output.puts "#error \"Invalid configuration. Error at: #{ast.filter(Error)[0].codeOrigin}\""
elsif not WORKING_BACKENDS.include? backend
$output.puts "#error \"This backend is not supported yet.\""
else
yield concreteSettings, ast, backend
end
if !$emitWinAsm
$output.puts "#endif"
else
$output.puts "_TEXT ENDS"
$output.puts "END"
# Write symbols needed by MASM
File.open("#{File.basename($output.path)}.sym", "w") {
| outp |
Label.forReferencedExtern {
| name |
outp.puts "EXTERN #{name[1..-1]} : near"
}
}
end
end
#
# emitCodeInAllConfigurations(ast) {
# | concreteSettings, ast, backend, index | ... }
#
# Emits guard codes for all valid configurations, and calls the block
# for those configurations that are valid and not erroneous.
#
def emitCodeInAllConfigurations(ast)
forEachValidSettingsCombination(ast) {
| concreteSettings, lowLevelAST, backend, index |
$output.puts cppSettingsTest(concreteSettings)
yield concreteSettings, lowLevelAST, backend, index
$output.puts "#endif"
}
end