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
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%% Purpose: Maintain atom, import, export, and other tables for assembler.
-module(beam_dict).
-export([new/0,opcode/2,highest_opcode/1,
atom/2,local/4,export/4,import/4,
string/2,lambda/5,literal/2,
atom_table/1,local_table/1,export_table/1,import_table/1,
string_table/1,lambda_table/1,literal_table/1]).
-type label() :: non_neg_integer().
-record(asm,
{atoms = gb_trees:empty() :: gb_tree(), %{Atom,Index}
exports = [] :: [{label(), arity(), label()}],
locals = [] :: [{label(), arity(), label()}],
imports = gb_trees:empty() :: gb_tree(), %{{M,F,A},Index}
strings = <<>> :: binary(), %String pool
lambdas = [], %[{...}]
literals = dict:new() :: dict(), %Format: {Literal,Number}
next_atom = 1 :: pos_integer(),
next_import = 0 :: non_neg_integer(),
string_offset = 0 :: non_neg_integer(),
next_literal = 0 :: non_neg_integer(),
highest_opcode = 0 :: non_neg_integer()
}).
-type bdict() :: #asm{}.
%%-----------------------------------------------------------------------------
-spec new() -> bdict().
new() ->
#asm{}.
%% Remember the highest opcode.
-spec opcode(non_neg_integer(), bdict()) -> bdict().
opcode(Op, Dict) when Dict#asm.highest_opcode > Op -> Dict;
opcode(Op, Dict) -> Dict#asm{highest_opcode=Op}.
%% Returns the highest opcode encountered.
-spec highest_opcode(bdict()) -> non_neg_integer().
highest_opcode(#asm{highest_opcode=Op}) -> Op.
%% Returns the index for an atom (adding it to the atom table if necessary).
%% atom(Atom, Dict) -> {Index,Dict'}
-spec atom(atom(), bdict()) -> {pos_integer(), bdict()}.
atom(Atom, #asm{atoms=Atoms0,next_atom=NextIndex}=Dict) when is_atom(Atom) ->
case gb_trees:lookup(Atom, Atoms0) of
{value,Index} ->
{Index,Dict};
none ->
Atoms = gb_trees:insert(Atom, NextIndex, Atoms0),
{NextIndex,Dict#asm{atoms=Atoms,next_atom=NextIndex+1}}
end.
%% Remembers an exported function.
%% export(Func, Arity, Label, Dict) -> Dict'
-spec export(atom(), arity(), label(), bdict()) -> bdict().
export(Func, Arity, Label, Dict0) when is_atom(Func),
is_integer(Arity),
is_integer(Label) ->
{Index, Dict1} = atom(Func, Dict0),
Dict1#asm{exports = [{Index, Arity, Label}| Dict1#asm.exports]}.
%% Remembers a local function.
%% local(Func, Arity, Label, Dict) -> Dict'
-spec local(atom(), arity(), label(), bdict()) -> bdict().
local(Func, Arity, Label, Dict0) when is_atom(Func),
is_integer(Arity),
is_integer(Label) ->
{Index,Dict1} = atom(Func, Dict0),
Dict1#asm{locals=[{Index,Arity,Label}|Dict1#asm.locals]}.
%% Returns the index for an import entry (adding it to the import table if necessary).
%% import(Mod, Func, Arity, Dict) -> {Index,Dict'}
-spec import(atom(), atom(), arity(), bdict()) -> {non_neg_integer(), bdict()}.
import(Mod0, Name0, Arity, #asm{imports=Imp0,next_import=NextIndex}=D0)
when is_atom(Mod0), is_atom(Name0), is_integer(Arity) ->
{Mod,D1} = atom(Mod0, D0),
{Name,D2} = atom(Name0, D1),
MFA = {Mod,Name,Arity},
case gb_trees:lookup(MFA, Imp0) of
{value,Index} ->
{Index,D2};
none ->
Imp = gb_trees:insert(MFA, NextIndex, Imp0),
{NextIndex,D2#asm{imports=Imp,next_import=NextIndex+1}}
end.
%% Returns the index for a string in the string table (adding the string to the
%% table if necessary).
%% string(String, Dict) -> {Offset, Dict'}
-spec string(string(), bdict()) -> {non_neg_integer(), bdict()}.
string(Str, Dict) when is_list(Str) ->
#asm{strings=Strings,string_offset=NextOffset} = Dict,
StrBin = list_to_binary(Str),
case old_string(StrBin, Strings) of
none ->
NewDict = Dict#asm{strings = <<Strings/binary,StrBin/binary>>,
string_offset=NextOffset+byte_size(StrBin)},
{NextOffset,NewDict};
Offset when is_integer(Offset) ->
{NextOffset-Offset,Dict}
end.
%% Returns the index for a funentry (adding it to the table if necessary).
%% lambda(Lbl, Index, Uniq, NumFree, Dict) -> {Index,Dict'}
-spec lambda(label(), non_neg_integer(), integer(), non_neg_integer(), bdict()) ->
{non_neg_integer(), bdict()}.
lambda(Lbl, Index, OldUniq, NumFree, #asm{lambdas=Lambdas0}=Dict) ->
OldIndex = length(Lambdas0),
Lambdas = [{Lbl,{OldIndex,Lbl,Index,NumFree,OldUniq}}|Lambdas0],
{OldIndex,Dict#asm{lambdas=Lambdas}}.
%% Returns the index for a literal (adding it to the atom table if necessary).
%% literal(Literal, Dict) -> {Index,Dict'}
-spec literal(term(), bdict()) -> {non_neg_integer(), bdict()}.
literal(Lit, #asm{literals=Tab0,next_literal=NextIndex}=Dict) ->
case dict:find(Lit, Tab0) of
{ok,Index} ->
{Index,Dict};
error ->
Tab = dict:store(Lit, NextIndex, Tab0),
{NextIndex,Dict#asm{literals=Tab,next_literal=NextIndex+1}}
end.
%% Returns the atom table.
%% atom_table(Dict) -> {LastIndex,[Length,AtomString...]}
-spec atom_table(bdict()) -> {non_neg_integer(), [[non_neg_integer(),...]]}.
atom_table(#asm{atoms=Atoms,next_atom=NumAtoms}) ->
Sorted = lists:keysort(2, gb_trees:to_list(Atoms)),
Fun = fun({A,_}) ->
L = atom_to_list(A),
[length(L)|L]
end,
AtomTab = lists:map(Fun, Sorted),
{NumAtoms-1,AtomTab}.
%% Returns the table of local functions.
%% local_table(Dict) -> {NumLocals, [{Function, Arity, Label}...]}
-spec local_table(bdict()) -> {non_neg_integer(), [{label(),arity(),label()}]}.
local_table(#asm{locals = Locals}) ->
{length(Locals),Locals}.
%% Returns the export table.
%% export_table(Dict) -> {NumExports, [{Function, Arity, Label}...]}
-spec export_table(bdict()) -> {non_neg_integer(), [{label(),arity(),label()}]}.
export_table(#asm{exports = Exports}) ->
{length(Exports),Exports}.
%% Returns the import table.
%% import_table(Dict) -> {NumImports, [{Module, Function, Arity}...]}
-spec import_table(bdict()) -> {non_neg_integer(), [{label(),label(),arity()}]}.
import_table(#asm{imports=Imp,next_import=NumImports}) ->
Sorted = lists:keysort(2, gb_trees:to_list(Imp)),
ImpTab = [MFA || {MFA,_} <- Sorted],
{NumImports,ImpTab}.
-spec string_table(bdict()) -> {non_neg_integer(), binary()}.
string_table(#asm{strings=Strings,string_offset=Size}) ->
{Size,Strings}.
-spec lambda_table(bdict()) -> {non_neg_integer(), [<<_:192>>]}.
lambda_table(#asm{locals=Loc0,lambdas=Lambdas0}) ->
Lambdas1 = sofs:relation(Lambdas0),
Loc = sofs:relation([{Lbl,{F,A}} || {F,A,Lbl} <- Loc0]),
Lambdas2 = sofs:relative_product1(Lambdas1, Loc),
Lambdas = [<<F:32,A:32,Lbl:32,Index:32,NumFree:32,OldUniq:32>> ||
{{_,Lbl,Index,NumFree,OldUniq},{F,A}} <- sofs:to_external(Lambdas2)],
{length(Lambdas),Lambdas}.
%% Returns the literal table.
%% literal_table(Dict) -> {NumLiterals, [<<TermSize>>,TermInExternalFormat]}
-spec literal_table(bdict()) -> {non_neg_integer(), [[binary(),...]]}.
literal_table(#asm{literals=Tab,next_literal=NumLiterals}) ->
L0 = dict:fold(fun(Lit, Num, Acc) ->
[{Num,my_term_to_binary(Lit)}|Acc]
end, [], Tab),
L1 = lists:sort(L0),
L = [[<<(byte_size(Term)):32>>,Term] || {_,Term} <- L1],
{NumLiterals,L}.
my_term_to_binary(Term) ->
term_to_binary(Term, [{minor_version,1}]).
%% Search for binary string Str in the binary string pool Pool.
%% old_string(Str, Pool) -> none | Index
-spec old_string(binary(), binary()) -> 'none' | pos_integer().
old_string(Str, Pool) ->
case binary:match(Pool, Str) of
nomatch -> none;
{Start,_Length} -> byte_size(Pool) - Start
end.
|
