-
Notifications
You must be signed in to change notification settings - Fork 131
/
ModuleLoader.pm
195 lines (177 loc) · 7.41 KB
/
ModuleLoader.pm
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
knowhow ModuleLoader {
my %modules_loaded;
my %settings_loaded;
method search_path($explicit_path) {
my @search_paths;
# Put any explicitly specified path on the start of the list.
# Otherwise see if --library was passed.
my $explicit;
try { $explicit := %*COMPILING<%?OPTIONS>{$explicit_path}; }
if !nqp::isnull($explicit) && $explicit {
@search_paths.push($explicit);
}
else {
my @lib_paths := pir::getinterp__P()[pir::const::IGLOBALS_LIB_PATHS][1];
if +@lib_paths > 3 {
@search_paths.push(@lib_paths[0]);
}
}
# Add CWD and blib.
@search_paths.push('.');
@search_paths.push('blib');
# Add NQP langauge directory.
my %conf := pir::getinterp__P()[pir::const::IGLOBALS_CONFIG_HASH];
@search_paths.push(%conf<libdir> ~ %conf<versiondir> ~
'/languages/nqp/lib');
@search_paths
}
method ctxsave() {
$*MAIN_CTX := nqp::ctxcaller(nqp::ctx());
$*CTXSAVE := 0;
}
method load_module($module_name, *@global_merge_target) {
# If we didn't already do so, load the module and capture
# its mainline. Otherwise, we already loaded it so go on
# with what we already have.
my $module_ctx;
my $path := nqp::join('/', nqp::split('::', $module_name)) ~ '.pbc';
my @prefixes := self.search_path('module-path');
for @prefixes -> $prefix {
if nqp::stat("$prefix/$path", 0) {
$path := "$prefix/$path";
last;
}
}
if nqp::existskey(%modules_loaded, $path) {
$module_ctx := %modules_loaded{$path};
}
else {
my $*CTXSAVE := self;
my $*MAIN_CTX := ModuleLoader;
my $preserve_global := pir::get_hll_global__Ps('GLOBAL');
pir::load_bytecode__vs($path);
pir::set_hll_global__vsP('GLOBAL', $preserve_global);
%modules_loaded{$path} := $module_ctx := $*MAIN_CTX;
}
# Provided we have a mainline...
if nqp::defined($module_ctx) {
# Merge any globals.
my $UNIT := pir::getattribute__PPs($module_ctx, 'lex_pad');
unless nqp::isnull($UNIT<GLOBALish>) {
if +@global_merge_target {
merge_globals(@global_merge_target[0], $UNIT<GLOBALish>);
}
}
}
return $module_ctx;
}
# XXX This is a really dumb and minimalistic GLOBAL merger.
# For a much more complete one, see sorear++'s work in
# Niecza. This one will likely evolve towards that, but for
# now I just need something that's just good enough for the
# immediate needs of NQP bootstrapping.
my $stub_how := 'KnowHOW';
sub merge_globals($target, $source) {
# XXX For now just merge the top level symbols;
# if there's a conflict then don't dig any deeper.
# Obviously, just a first cut at this. :-)
my %known_symbols;
for $target.WHO {
%known_symbols{$_.key} := 1;
}
for $source.WHO {
my $sym := $_.key;
if !nqp::existskey(%known_symbols, $sym) {
my $source_is_stub := 0;
try {
my $source_mo := $_.value.HOW;
$source_is_stub := $source_mo.WHAT.HOW.name($source_mo) eq $stub_how &&
!nqp::isnull(nqp::who($_.value)) && nqp::who($_.value);
}
if $source_is_stub {
my $source := $_.value;
my $source_clone := $source.HOW.new_type(:name($source.HOW.name($source)));
$source_clone.HOW.compose($source_clone);
my %WHO_clone;
for nqp::who($source) {
%WHO_clone{$_.key} := $_.value;
}
nqp::setwho($source_clone, %WHO_clone);
($target.WHO){$sym} := $source_clone;
}
else {
($target.WHO){$sym} := $_.value;
}
}
elsif ($target.WHO){$sym} =:= $_.value {
# No problemo; a symbol can't conflict with itself.
}
else {
my $source_mo := $_.value.HOW;
my $source_is_stub := $source_mo.WHAT.HOW.name($source_mo) eq $stub_how;
my $target_mo := ($target.WHO){$sym}.HOW;
my $target_is_stub := $target_mo.WHAT.HOW.name($target_mo) eq $stub_how;
if $source_is_stub && $target_is_stub {
# Leave target as is, and merge the nested symbols.
merge_globals(($target.WHO){$sym}, $_.value);
}
else {
nqp::die("Merging GLOBAL symbols failed: duplicate definition of symbol $sym");
}
}
}
}
method load_setting($setting_name) {
my $setting;
if $setting_name ne 'NULL' {
# Add path prefix and .setting suffix.
my $path := "$setting_name.setting.pbc";
my @prefixes := self.search_path('setting-path');
for @prefixes -> $prefix {
if nqp::stat("$prefix/$path", 0) {
$path := "$prefix/$path";
last;
}
}
# Unless we already did so, load the setting.
unless nqp::existskey(%settings_loaded, $path) {
my $*CTXSAVE := self;
my $*MAIN_CTX := ModuleLoader;
my $preserve_global := pir::get_hll_global__Ps('GLOBAL');
pir::load_bytecode__vs($path);
pir::set_hll_global__vsP('GLOBAL', $preserve_global);
unless nqp::defined($*MAIN_CTX) {
nqp::die("Unable to load setting $setting_name; maybe it is missing a YOU_ARE_HERE?");
}
%settings_loaded{$path} := $*MAIN_CTX;
}
$setting := %settings_loaded{$path};
}
return $setting;
}
# Called by the mainline of the module that we started execution in.
# Registers it as a module so we don't duplicate-load it.
method set_mainline_module($mainline_ctx) {
# May be fake executable, so may not end in .pbc. If so, add it.
# Strip any .exe.
my $module_name := ((pir::getinterp__P())[2])[0];
if nqp::substr($module_name, 0, 2) eq './' {
$module_name := nqp::substr($module_name, 2, nqp::chars($module_name) - 2);
}
if nqp::substr($module_name, nqp::chars($module_name) - 4, 4) eq '.pbc' {
# Fine as it is.
}
elsif nqp::substr($module_name, nqp::chars($module_name) - 4, 4) eq '.exe' {
# Replace exe with pbc.
$module_name := nqp::substr($module_name, 0, nqp::chars($module_name) - 3) ~ 'pbc';
}
else {
$module_name := $module_name ~ '.pbc';
}
# Store context under this name.
%modules_loaded{$module_name} := $mainline_ctx;
}
}
# Since this *is* the module loader, we can't locate it the normal way by
# GLOBAL merging. So instead we stash it away in the Parrot namespace tree.
pir::set_hll_global__vsP('ModuleLoader', ModuleLoader);