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
|
#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module implements the passes functionality. A pass must implement the
## `TPass` interface.
import
options, ast, llstream, msgs,
idents,
syntaxes, idgen, modulegraphs, reorder, rod,
lineinfos, pathutils
type
TPassData* = tuple[input: PNode, closeOutput: PNode]
# a pass is a tuple of procedure vars ``TPass.close`` may produce additional
# nodes. These are passed to the other close procedures.
# This mechanism used to be used for the instantiation of generics.
proc makePass*(open: TPassOpen = nil,
process: TPassProcess = nil,
close: TPassClose = nil,
isFrontend = false): TPass =
result.open = open
result.close = close
result.process = process
result.isFrontend = isFrontend
proc skipCodegen*(config: ConfigRef; n: PNode): bool {.inline.} =
# can be used by codegen passes to determine whether they should do
# something with `n`. Currently, this ignores `n` and uses the global
# error count instead.
result = config.errorCounter > 0
const
maxPasses = 10
type
TPassContextArray = array[0..maxPasses - 1, PPassContext]
proc clearPasses*(g: ModuleGraph) =
g.passes.setLen(0)
proc registerPass*(g: ModuleGraph; p: TPass) =
internalAssert g.config, g.passes.len < maxPasses
g.passes.add(p)
proc carryPass*(g: ModuleGraph; p: TPass, module: PSym;
m: TPassData): TPassData =
var c = p.open(g, module)
result.input = p.process(c, m.input)
result.closeOutput = if p.close != nil: p.close(g, c, m.closeOutput)
else: m.closeOutput
proc carryPasses*(g: ModuleGraph; nodes: PNode, module: PSym;
passes: openArray[TPass]) =
var passdata: TPassData
passdata.input = nodes
for pass in passes:
passdata = carryPass(g, pass, module, passdata)
proc openPasses(g: ModuleGraph; a: var TPassContextArray;
module: PSym) =
for i in 0..<g.passes.len:
if not isNil(g.passes[i].open):
a[i] = g.passes[i].open(g, module)
else: a[i] = nil
proc closePasses(graph: ModuleGraph; a: var TPassContextArray) =
var m: PNode = nil
for i in 0..<graph.passes.len:
if not isNil(graph.passes[i].close): m = graph.passes[i].close(graph, a[i], m)
a[i] = nil # free the memory here
proc processTopLevelStmt(graph: ModuleGraph, n: PNode, a: var TPassContextArray): bool =
# this implements the code transformation pipeline
var m = n
for i in 0..<graph.passes.len:
if not isNil(graph.passes[i].process):
m = graph.passes[i].process(a[i], m)
if isNil(m): return false
result = true
proc resolveMod(conf: ConfigRef; module, relativeTo: string): FileIndex =
let fullPath = findModule(conf, module, relativeTo)
if fullPath.isEmpty:
result = InvalidFileIdx
else:
result = fileInfoIdx(conf, fullPath)
proc processImplicits(graph: ModuleGraph; implicits: seq[string], nodeKind: TNodeKind,
a: var TPassContextArray; m: PSym) =
# XXX fixme this should actually be relative to the config file!
let relativeTo = toFullPath(graph.config, m.info)
for module in items(implicits):
# implicit imports should not lead to a module importing itself
if m.position != resolveMod(graph.config, module, relativeTo).int32:
var importStmt = newNodeI(nodeKind, m.info)
var str = newStrNode(nkStrLit, module)
str.info = m.info
importStmt.add str
if not processTopLevelStmt(graph, importStmt, a): break
const
imperativeCode = {low(TNodeKind)..high(TNodeKind)} - {nkTemplateDef, nkProcDef, nkMethodDef,
nkMacroDef, nkConverterDef, nkIteratorDef, nkFuncDef, nkPragma,
nkExportStmt, nkExportExceptStmt, nkFromStmt, nkImportStmt, nkImportExceptStmt}
proc prepareConfigNotes(graph: ModuleGraph; module: PSym) =
# don't be verbose unless the module belongs to the main package:
if module.getnimblePkgId == graph.config.mainPackageId:
graph.config.notes = graph.config.mainPackageNotes
else:
if graph.config.mainPackageNotes == {}: graph.config.mainPackageNotes = graph.config.notes
graph.config.notes = graph.config.foreignPackageNotes
proc moduleHasChanged*(graph: ModuleGraph; module: PSym): bool {.inline.} =
result = module.id >= 0 or isDefined(graph.config, "nimBackendAssumesChange")
proc processModule*(graph: ModuleGraph; module: PSym, stream: PLLStream): bool {.discardable.} =
if graph.stopCompile(): return true
var
p: Parser
a: TPassContextArray
s: PLLStream
fileIdx = module.fileIdx
prepareConfigNotes(graph, module)
if module.id < 0:
# new module caching mechanism:
for i in 0..<graph.passes.len:
if not isNil(graph.passes[i].open) and not graph.passes[i].isFrontend:
a[i] = graph.passes[i].open(graph, module)
else:
a[i] = nil
if not graph.stopCompile():
let n = loadNode(graph, module)
var m = n
for i in 0..<graph.passes.len:
if not isNil(graph.passes[i].process) and not graph.passes[i].isFrontend:
m = graph.passes[i].process(a[i], m)
if isNil(m):
break
var m: PNode = nil
for i in 0..<graph.passes.len:
if not isNil(graph.passes[i].close) and not graph.passes[i].isFrontend:
m = graph.passes[i].close(graph, a[i], m)
a[i] = nil
else:
openPasses(graph, a, module)
if stream == nil:
let filename = toFullPathConsiderDirty(graph.config, fileIdx)
s = llStreamOpen(filename, fmRead)
if s == nil:
rawMessage(graph.config, errCannotOpenFile, filename.string)
return false
else:
s = stream
while true:
openParser(p, fileIdx, s, graph.cache, graph.config)
if module.owner == nil or module.owner.name.s != "stdlib" or module.name.s == "distros":
# XXX what about caching? no processing then? what if I change the
# modules to include between compilation runs? we'd need to track that
# in ROD files. I think we should enable this feature only
# for the interactive mode.
if module.name.s != "nimscriptapi":
processImplicits graph, graph.config.implicitImports, nkImportStmt, a, module
processImplicits graph, graph.config.implicitIncludes, nkIncludeStmt, a, module
while true:
if graph.stopCompile(): break
var n = parseTopLevelStmt(p)
if n.kind == nkEmpty: break
if (sfSystemModule notin module.flags and
({sfNoForward, sfReorder} * module.flags != {} or
codeReordering in graph.config.features)):
# read everything, no streaming possible
var sl = newNodeI(nkStmtList, n.info)
sl.add n
while true:
var n = parseTopLevelStmt(p)
if n.kind == nkEmpty: break
sl.add n
if sfReorder in module.flags or codeReordering in graph.config.features:
sl = reorder(graph, sl, module)
discard processTopLevelStmt(graph, sl, a)
break
elif n.kind in imperativeCode:
# read everything until the next proc declaration etc.
var sl = newNodeI(nkStmtList, n.info)
sl.add n
var rest: PNode = nil
while true:
var n = parseTopLevelStmt(p)
if n.kind == nkEmpty or n.kind notin imperativeCode:
rest = n
break
sl.add n
#echo "-----\n", sl
if not processTopLevelStmt(graph, sl, a): break
if rest != nil:
#echo "-----\n", rest
if not processTopLevelStmt(graph, rest, a): break
else:
#echo "----- single\n", n
if not processTopLevelStmt(graph, n, a): break
closeParser(p)
if s.kind != llsStdIn: break
closePasses(graph, a)
# id synchronization point for more consistent code generation:
idSynchronizationPoint(1000)
result = true
|
