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
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
|
// Copyright (c) 1996 James Clark
// See the file copying.txt for copying permission.
#ifndef Expression_INCLUDED
#define Expression_INCLUDED 1
#include "ELObj.h"
#include <OpenSP/Owner.h>
#include <OpenSP/Vector.h>
#include <OpenSP/NCVector.h>
#include <OpenSP/Resource.h>
#include <OpenSP/Ptr.h>
#include "Insn.h"
#include <OpenSP/Named.h>
#include <OpenSP/Location.h>
#ifdef DSSSL_NAMESPACE
namespace DSSSL_NAMESPACE {
#endif
class Interpreter;
class Identifier;
struct BoundVar {
const Identifier *ident;
enum {
usedFlag = 01,
assignedFlag = 02,
sharedFlag = 04,
uninitFlag = 010,
boxedFlags = assignedFlag|sharedFlag
};
static bool flagsBoxed(unsigned f) { return (f & boxedFlags) == boxedFlags; }
bool boxed() const { return flagsBoxed(flags); }
unsigned flags;
unsigned reboundCount;
};
class BoundVarList : public Vector<BoundVar> {
public:
BoundVarList() { }
BoundVarList(const Vector<const Identifier *> &);
BoundVarList(const Vector<const Identifier *> &, size_t, unsigned flags = 0);
void append(const Identifier *, unsigned flags);
void mark(const Identifier *, unsigned flags);
void removeUnused();
void remove(const Vector<const Identifier *> &);
void rebind(const Vector<const Identifier *> &);
void unbind(const Vector<const Identifier *> &);
BoundVar *find(const Identifier *);
};
class Environment {
public:
Environment();
Environment(const BoundVarList &frameVars,
const BoundVarList &closureVars);
void boundVars(BoundVarList &) const;
bool lookup(const Identifier *var,
bool &isFrame, int &index, unsigned &flags) const;
void augmentFrame(const BoundVarList &,
int stackPos);
private:
struct FrameVarList : public Resource {
int stackPos;
const BoundVarList *vars;
ConstPtr<FrameVarList> next;
};
ConstPtr<FrameVarList> frameVarList_;
const BoundVarList *closureVars_;
};
class Expression {
public:
Expression(const Location &);
virtual ~Expression() { }
virtual InsnPtr compile(Interpreter &, const Environment &, int,
const InsnPtr &) = 0;
static
InsnPtr optimizeCompile(Owner<Expression> &, Interpreter &, const Environment &, int,
const InsnPtr &);
virtual void markBoundVars(BoundVarList &vars, bool);
virtual void optimize(Interpreter &, const Environment &, Owner<Expression> &);
virtual ELObj *constantValue() const;
virtual bool canEval(bool maybeCall) const = 0;
virtual const Identifier *keyword() const;
const Location &location() const;
protected:
static
InsnPtr compilePushVars(Interpreter &interp,
const Environment &env, int stackPos,
const BoundVarList &vars, size_t varIndex,
const InsnPtr &next);
private:
Location loc_;
};
class ConstantExpression : public Expression {
public:
ConstantExpression(ELObj *, const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
bool canEval(bool maybeCall) const;
const Identifier *keyword() const;
private:
ELObj *obj_; // must be permanent
};
class ResolvedConstantExpression : public Expression {
public:
ResolvedConstantExpression(ELObj *, const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
bool canEval(bool maybeCall) const;
ELObj *constantValue() const;
private:
ELObj *obj_;
};
class CallExpression : public Expression {
public:
CallExpression(Owner<Expression> &, NCVector<Owner<Expression> > &,
const Location &loc);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
int nArgs();
bool canEval(bool maybeCall) const;
private:
Owner<Expression> op_;
NCVector<Owner<Expression> > args_;
};
class VariableExpression : public Expression {
public:
VariableExpression(const Identifier *, const Location &loc);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
private:
const Identifier *ident_;
bool isTop_;
};
class IfExpression : public Expression {
public:
IfExpression(Owner<Expression> &,
Owner<Expression> &,
Owner<Expression> &,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
private:
Owner<Expression> test_;
Owner<Expression> consequent_;
Owner<Expression> alternate_;
};
class OrExpression : public Expression {
public:
OrExpression(Owner<Expression> &,
Owner<Expression> &,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
private:
Owner<Expression> test1_;
Owner<Expression> test2_;
};
class CondFailExpression : public Expression {
public:
CondFailExpression(const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
bool canEval(bool maybeCall) const;
};
class CaseExpression : public Expression {
public:
struct Case {
Vector<ELObj *> datums;
Owner<Expression> expr;
};
CaseExpression(Owner<Expression> &,
NCVector<Case> &,
Owner<Expression> &,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
private:
Owner<Expression> key_;
NCVector<Case> cases_;
Vector<unsigned> nResolved_;
Owner<Expression> else_;
};
class LambdaExpression : public Expression {
public:
LambdaExpression(Vector<const Identifier *> &vars,
NCVector<Owner<Expression> > &inits,
int nOptional,
bool hasRest,
int nKey,
Owner<Expression> &body,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
private:
Vector<const Identifier *> formals_;
NCVector<Owner<Expression> > inits_;
Signature sig_;
Owner<Expression> body_;
};
class LetExpression : public Expression {
public:
LetExpression(Vector<const Identifier *> &vars,
NCVector<Owner<Expression> > &inits,
Owner<Expression> &body,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
protected:
InsnPtr compileInits(Interpreter &interp, const Environment &env,
const BoundVarList &initVars,
size_t initIndex, int stackPos, const InsnPtr &next);
Vector<const Identifier *> vars_;
NCVector<Owner<Expression> > inits_;
Owner<Expression> body_;
};
class LetStarExpression : public LetExpression {
public:
LetStarExpression(Vector<const Identifier *> &vars,
NCVector<Owner<Expression> > &inits,
Owner<Expression> &body,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
private:
InsnPtr compileInits(Interpreter &interp, const Environment &env,
const BoundVarList &initVars,
size_t initIndex, int stackPos, const InsnPtr &next);
};
class LetrecExpression : public Expression {
public:
LetrecExpression(Vector<const Identifier *> &vars,
NCVector<Owner<Expression> > &inits,
Owner<Expression> &body,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
private:
InsnPtr compileInits(Interpreter &interp, const Environment &env,
size_t initIndex, int stackPos, const InsnPtr &next);
Vector<const Identifier *> vars_;
NCVector<Owner<Expression> > inits_;
Owner<Expression> body_;
};
class QuasiquoteExpression : public Expression {
public:
enum Type {
listType,
improperType,
vectorType
};
QuasiquoteExpression(NCVector<Owner<Expression> > &,
Vector<PackedBoolean> &spliced,
Type type,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
private:
NCVector<Owner<Expression> > members_;
Vector<PackedBoolean> spliced_;
Type type_;
};
class SequenceExpression : public Expression {
public:
SequenceExpression(NCVector<Owner<Expression> > &,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
void optimize(Interpreter &, const Environment &, Owner<Expression> &);
private:
NCVector<Owner<Expression> > sequence_;
};
class AssignmentExpression : public Expression {
public:
AssignmentExpression(const Identifier *,
Owner<Expression> &,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
private:
const Identifier *var_;
Owner<Expression> value_;
};
class ProcessingMode;
class WithModeExpression : public Expression {
public:
WithModeExpression(const ProcessingMode *, Owner<Expression> &,
const Location &);
InsnPtr compile(Interpreter &, const Environment &, int,
const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
private:
const ProcessingMode *mode_;
Owner<Expression> expr_;
};
class StyleExpression : public Expression {
public:
StyleExpression(Vector<const Identifier *> &,
NCVector<Owner<Expression> > &,
const Location &loc);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
void markBoundVars(BoundVarList &vars, bool);
bool canEval(bool maybeCall) const;
protected:
virtual void unknownStyleKeyword(const Identifier *ident, Interpreter &interp,
const Location &loc) const;
virtual bool maybeStyleKeyword(const Identifier *ident) const;
Vector<const Identifier *> keys_;
NCVector<Owner<Expression> > exprs_;
};
class FlowObj;
class MakeExpression : public StyleExpression {
public:
MakeExpression(const Identifier *,
Vector<const Identifier *> &,
NCVector<Owner<Expression> > &,
const Location &loc);
InsnPtr compile(Interpreter &, const Environment &, int, const InsnPtr &);
private:
InsnPtr compileNonInheritedCs(Interpreter &interp, const Environment &env,
int stackPos, const InsnPtr &next);
FlowObj *applyConstNonInheritedCs(FlowObj *, Interpreter &, const Environment &);
void unknownStyleKeyword(const Identifier *ident, Interpreter &interp,
const Location &loc) const;
bool maybeStyleKeyword(const Identifier *ident) const;
const Identifier *foc_;
};
inline
const Location &Expression::location() const
{
return loc_;
}
inline
InsnPtr Expression::optimizeCompile(Owner<Expression> &expr, Interpreter &interp,
const Environment &env, int stackPos,
const InsnPtr &next)
{
expr->optimize(interp, env, expr);
return expr->compile(interp, env, stackPos, next);
}
#ifdef DSSSL_NAMESPACE
}
#endif
#endif /* not Expression_INCLUDED */
|
