about summary refs log tree commit diff stats
path: root/archive/1.vm/build4
blob: dec46810ed4158fae7e0cb31ec1340c17d811361 (plain) (blame)
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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
#!/bin/sh
# Experimental alternative to build2 that can run steps in parallel if their
# dependencies are met. Caveats:
#
#   1. We rely on the OS to schedule steps, so thousands of independent tasks
#      will likely be counter-productive.
#   2. Can run out of virtual memory if you spawn too many say $CC processes.
#   3. Compilation errors can cause the script to hang. We tag the most common
#      suspects with '|| quit', but can't eliminate the possibility entirely.
#   4. Ugly as heck! This version really benefits from comparisons with its
#      'upstream', build2. And even then, diff gets confused.
#   5. There's a mechanical difficulty: we use mktemp to reliably create
#      temporary filenames, which has the side effect of also creating the
#      files. So zero-size files are considered equivalent to non-existent
#      files. When some commands have trouble with this (e.g. ar) we need to
#      delete the empty file, which can expose us to a race condition wrt
#      mktemp.

set -e  # stop immediately on error

# Some environment variables that can be passed in. For example, to turn off
# optimization:
#   $ CFLAGS=-g ./build4
test "$CXX" || export CXX=c++
test "$CC" || export CC=cc
test "$CFLAGS" || export CFLAGS="-g -O2"
export CFLAGS="$CFLAGS -Wall -Wextra -ftrapv -fno-strict-aliasing"
export CXXFLAGS="-std=c++98 $CFLAGS"  # CI has an ancient version; don't expect recent dialects

# Outline:
# [0-9]*.cc -> mu.cc -> .build/*.cc -> .build/*.o -> .build/mu_bin
# (layers)   |        |              |             |
#          tangle  cleave          $CXX          $CXX

# can also be called with a layer to only build until
#   $ ./build4 --until 050
UNTIL_LAYER=${2:-zzz}

# there's two mechanisms for fast builds here:
# - if a command is quick to run, always run it but update the result only on any change
# - otherwise run it only if the output is 'older_than' the inputs
#
# avoid combining both mechanisms for a single file
# otherwise you'll see spurious messages about files being updated
# risk: a file may unnecessarily update without changes, causing unnecessary work downstream

# return 1 if $1 is older than _any_ of the remaining args
older_than() {
  local target=$1
  shift
  if [ ! -s $target ]
  then
#?     echo "$target has size zero"
#?     echo "updating $target" >&2
    return 0  # success
  fi
  local f
  for f in $*
  do
    if [ $f -nt $target ]
    then
#?       echo "updating $target" >&2
      return 0  # success
    fi
  done
  return 1  # failure
}

# redirect to $1, unless it's already identical
update() {
  if [ ! -e $1 ]
  then
    cat > $1
  else
    cat > $1.tmp
    diff -q $1 $1.tmp >/dev/null  &&  rm $1.tmp  ||  mv $1.tmp $1
  fi
}

update_cp() {
  if [ ! -e $2/$1 ]
  then
    cp $1 $2
  elif [ $1 -nt $2/$1 ]
  then
    cp $1 $2
  fi
}

noisy_cd() {
  cd $1
  echo "-- `pwd`" >&2
}

mv_if_exists() {
  test -e $1  &&  mv $1 $2
  return 0
}

# wait for all the given filenames to exist
# exit immediately if a special file called '.quit' exists
QUITFILE=`pwd`/.quit
rm -f $QUITFILE
wait_for_all() {
  # could use inotify on Linux
  while ! all_exist "$@"
  do
#?     echo waiting: $*
    test -e $QUITFILE  &&  return 1  # some step had an error; stop all waiting steps using errexit
    sleep 1
  done
  return 0
}
quit() {
  touch $QUITFILE
  exit 1
}

all_exist() {
  for f in "$@"
  do
    test -e $f  ||  return 1
  done
  return 0
}

TMP=`mktemp`
mv_if_exists ../../tools/enumerate $TMP
(
  wait_for_all ../../tools/enumerate.cc
  older_than $TMP ../../tools/enumerate.cc && {
    echo "building enumerate"
    $CXX $CXXFLAGS ../../tools/enumerate.cc -o $TMP  ||  quit
    echo "done building enumerate"
  }
  mv $TMP ../../tools/enumerate
) &

TMP=`mktemp`
mv_if_exists ../../tools/tangle $TMP
(
  wait_for_all ../../tools/tangle.cc
  older_than $TMP ../../tools/tangle.cc && {
    echo "building tangle"
    cd ../../tools
      # auto-generate various lists (ending in '_list' by convention) {
      # list of function declarations, so I can define them in any order
      grep -h "^[^ #].*) {" tangle.cc  |sed 's/ {.*/;/'  |update tangle.function_list
      # list of tests to run
      grep -h "^[[:space:]]*void test_" tangle.cc  |sed 's/^\s*void \(.*\)() {$/\1,/'  |update tangle.test_list
      grep -h "^\s*void test_" tangle.cc  |sed 's/^\s*void \(.*\)() {.*/"\1",/'  |update tangle.test_name_list
      # }
      # Now that we have all the _lists, compile 'tangle'
      $CXX $CXXFLAGS tangle.cc -o $TMP  ||  quit
      $TMP test
    cd ../archive/1.vm
    echo "done building tangle"
  }
  mv $TMP ../../tools/tangle
) &

wait_for_all ../../tools/enumerate
echo "enumerating layers"
LAYERS=$(../../tools/enumerate --until $UNTIL_LAYER  |grep '\.cc$')
echo "done enumerating layers"

TMP=`mktemp`
mv_if_exists mu.cc $TMP
(
  wait_for_all $LAYERS ../../tools/enumerate ../../tools/tangle
  older_than $TMP $LAYERS ../../tools/enumerate ../../tools/tangle && {
    echo "running tangle"
    # no update here; rely on 'update' calls downstream
    ../../tools/tangle $LAYERS >$TMP  ||  quit
    echo "done running tangle"
  }
  mv $TMP mu.cc
) &

TMP=`mktemp`
mv_if_exists cleave/cleave $TMP
(
  wait_for_all cleave/cleave.cc
  older_than $TMP cleave/cleave.cc && {
    echo "building cleave"
    $CXX $CXXFLAGS cleave/cleave.cc -o $TMP  ||  quit
    rm -rf .build
    echo "done building cleave"
  }
  mv $TMP cleave/cleave
) &

wait_for_all mu.cc cleave/cleave  # cleave/cleave just for the .build cleanup
mkdir -p .build
# auto-generate function declarations, so I can define them in any order
# functions start out unindented, have all args on the same line, and end in ') {'
#
#                                      \/ ignore struct/class methods
grep -h "^[^[:space:]#].*) {$" mu.cc  |grep -v ":.*("  |sed 's/ {.*/;/'  |update .build/function_list
# auto-generate list of tests to run
grep -h "^\s*void test_" mu.cc  |sed 's/^\s*void \(.*\)() {.*/\1,/'  |update .build/test_list
grep -h "^\s*void test_" mu.cc  |sed 's/^\s*void \(.*\)() {.*/"\1",/'  |update .build/test_name_list
mkdir -p .build/termbox
update_cp termbox/termbox.h .build/termbox

TMP=`mktemp`
mv_if_exists mu_bin $TMP
(
  wait_for_all mu.cc cleave/cleave termbox/*.c termbox/*.h termbox/*.inl
  older_than $TMP mu.cc *_list cleave/cleave termbox/* && {
    echo "building mu_bin"
    cleave/cleave mu.cc .build  ||  quit
    cd .build
      # create the list of global variable declarations from the corresponding definitions
      grep ';' global_definitions_list  |sed 's/[=(].*/;/'  |sed 's/^[^\/# ]/extern &/'  |sed 's/^extern extern /extern /'  |update global_declarations_list
      for f in mu_*.cc
      do
        OBJ=`echo $f |sed 's/\.cc$/.o/'`
        TMP=`mktemp`
        mv_if_exists $OBJ $TMP
        (
          older_than $TMP $f header global_declarations_list function_list test_list && {
            echo "building $OBJ"
            $CXX $CXXFLAGS -c $f -o $TMP  ||  quit
            echo "done building $OBJ"
          }
          mv $TMP $OBJ
        ) &
      done
    cd ../termbox
      TMP=`mktemp`
      mv_if_exists utf8.o $TMP
      (
        older_than $TMP utf8.c && {
          echo "building termbox/utf8.o"
          $CC $CFLAGS -c utf8.c -o $TMP  ||  quit
          echo "done building termbox/utf8.o"
        }
        mv $TMP utf8.o
      ) &
      TMP=`mktemp`
      mv_if_exists termbox.o $TMP
      (
        older_than $TMP termbox.c termbox.h input.inl output.inl bytebuffer.inl && {
          echo "building termbox/termbox.o"
          $CC $CFLAGS -c termbox.c -o $TMP  ||  quit
          echo "done building termbox/termbox.o"
        }
        mv $TMP termbox.o
      ) &
      TMP=`mktemp`
      mv_if_exists libtermbox.a $TMP
      (
        wait_for_all termbox.o utf8.o
        older_than $TMP termbox.o utf8.o && {
          echo "building termbox/libtermbox.a"
          rm $TMP;  ar rcs $TMP termbox.o utf8.o  ||  quit  # race condition; later mktemp may end up reusing this file
          echo "done building termbox/libtermbox.a"
        }
        mv $TMP libtermbox.a
      ) &
    cd ..
    MU_OBJS=`echo .build/mu_*.cc |sed 's/\.cc/.o/g'`
    echo wait_for_all $MU_OBJS termbox/libtermbox.a
    wait_for_all $MU_OBJS termbox/libtermbox.a
    echo "building .build/mu_bin"
    $CXX $CXXFLAGS $MU_OBJS termbox/libtermbox.a -o $TMP  ||  quit
    echo "done building .build/mu_bin"
    echo "done building mu_bin"
  }
  mv $TMP mu_bin
) &

## [0-9]*.mu -> core.mu

wait_for_all ../../tools/enumerate
echo "building core.mu"
MU_LAYERS=$(../../tools/enumerate --until $UNTIL_LAYER  |grep '\.mu$') || exit 0  # ok if no .mu files
cat $MU_LAYERS  |update core.mu
echo "done building core.mu"

wait_for_all mu_bin
exit 0

# scenarios considered:
#   0 status when nothing needs updating
#   only a single layer is recompiled when changing a C++ function
#   stop immediately after any failure