-
Notifications
You must be signed in to change notification settings - Fork 610
/
symbol_table.cpp
221 lines (182 loc) · 6.36 KB
/
symbol_table.cpp
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
#include "symbol_table.hpp"
#include "exception.hpp"
#include "configuration.hpp"
#include "builtin/array.hpp"
#include "builtin/encoding.hpp"
#include "builtin/exception.hpp"
#include "builtin/string.hpp"
#include "builtin/symbol.hpp"
#include <iostream>
#include <iomanip>
namespace rubinius {
SymbolTable::Kind SymbolTable::detect_kind(const char* str, size_t size) {
const char one = str[0];
// A constant begins with an uppercase letter.
if(one >= 'A' && one <= 'Z') {
// Make sure that the rest of it is only alphanumerics
for(size_t i = 1; i < size; i++) {
if((isalnum(str[i]) || str[i] == '_') == false)
return SymbolTable::Normal;
}
return SymbolTable::Constant;
}
if(one == '@') {
// A class variable begins with @@
if(size > 1 && str[1] == '@') {
return SymbolTable::CVar;
}
// An instance variable can't start with a digit and can't be just @.
if((size == 1) || (size > 1 && ISDIGIT(str[1]))) {
return SymbolTable::Normal;
}
// An instance variable begins with @
return SymbolTable::IVar;
}
// A system variable begins with __
if(size > 2 && one == '_' && str[1] == '_') {
return SymbolTable::System;
}
// Everything else is normal
return SymbolTable::Normal;
}
SymbolTable::Kind SymbolTable::kind(STATE, const Symbol* sym) {
utilities::thread::SpinLock::LockGuard guard(lock_);
return kinds[sym->index()];
}
size_t SymbolTable::add(std::string str, int enc) {
bytes_used_ += (str.size() + sizeof(std::string) + sizeof(int) + sizeof(Kind));
strings.push_back(str);
encodings.push_back(enc);
kinds.push_back(detect_kind(str.data(), str.size()));
return strings.size() - 1;
}
Symbol* SymbolTable::lookup(STATE, const char* str, size_t length) {
return lookup(str, length, Encoding::eAscii, state->hash_seed());
}
struct SpecialOperator {
const char* name;
const char* symbol;
};
// These are a set of special operators that MRI
// changes the symbol value of.
static SpecialOperator SpecialOperators[] = {
{"+(binary)", "+"},
{"-(binary)", "-"},
{"+(unary)", "+@"},
{"-(unary)", "-@"},
{"!(unary)", "!"},
{"~(unary)", "~"},
{"!@", "!"},
{"~@", "~"}
};
const static int cNumSpecialOperators = 8;
static const char* find_special(const char* check, size_t length) {
for(int i = 0; i < cNumSpecialOperators; i++) {
SpecialOperator* op = &SpecialOperators[i];
if(*op->name == *check && strncmp(op->name, check, length) == 0) {
return op->symbol;
}
}
return 0;
}
Symbol* SymbolTable::lookup(SharedState* shared, const std::string& str) {
return lookup(str.data(), str.size(), Encoding::eAscii, shared->hash_seed);
}
Symbol* SymbolTable::lookup(STATE, const std::string& str) {
return lookup(str.data(), str.size(), Encoding::eAscii, state->hash_seed());
}
Symbol* SymbolTable::lookup(const char* str, size_t length, int enc, uint32_t seed) {
size_t sym;
if(const char* op = find_special(str, length)) {
str = op;
length = strlen(str);
}
hashval hash = String::hash_str((unsigned char*)str, length, seed);
// Symbols can be looked up by multiple threads at the same time.
// This is fast operation, so we protect this with a spinlock.
{
utilities::thread::SpinLock::LockGuard guard(lock_);
SymbolMap::iterator entry = symbols.find(hash);
if(entry == symbols.end()) {
sym = add(std::string(str, length), enc);
SymbolIds v(1, sym);
symbols[hash] = v;
} else {
SymbolIds& v = entry->second;
for(SymbolIds::const_iterator i = v.begin(); i != v.end(); ++i) {
std::string& s = strings[*i];
int e = encodings[*i];
if(!strncmp(s.data(), str, length) && e == enc) return Symbol::from_index(*i);
}
sym = add(std::string(str, length), enc);
v.push_back(sym);
}
}
return Symbol::from_index(sym);
}
Symbol* SymbolTable::lookup(STATE, String* str) {
if(str->nil_p()) {
Exception::argument_error(state, "Cannot look up Symbol from nil");
return NULL;
}
// Since we also explicitly use the size, we can safely
// use byte_address() here.
const char* bytes = (const char*) str->byte_address();
size_t size = str->byte_size();
int enc = str->encoding(state)->index();
if(CBOOL(str->ascii_only_p(state))) {
enc = Encoding::eAscii;
}
return lookup(bytes, size, enc, state->hash_seed());
}
String* SymbolTable::lookup_string(STATE, const Symbol* sym) {
utilities::thread::SpinLock::LockGuard guard(lock_);
if(sym->nil_p()) {
Exception::argument_error(state, "Cannot look up Symbol from nil");
return NULL;
}
size_t sym_index = sym->index();
if(sym_index >= strings.size()) {
return NULL;
}
std::string& str = strings[sym_index];
int enc = encodings[sym_index];
String* s = String::create(state, str.data(), str.size());
s->encoding(state, Encoding::from_index(state, enc));
return s;
}
std::string& SymbolTable::lookup_cppstring(const Symbol* sym) {
utilities::thread::SpinLock::LockGuard guard(lock_);
return strings[sym->index()];
}
int SymbolTable::lookup_encoding(const Symbol* sym) {
utilities::thread::SpinLock::LockGuard guard(lock_);
return encodings[sym->index()];
}
std::string SymbolTable::lookup_debug_string(const Symbol* sym) {
utilities::thread::SpinLock::LockGuard guard(lock_);
std::string str = strings[sym->index()];
std::ostringstream os;
unsigned char* cstr = (unsigned char*) str.data();
size_t size = str.size();
for(size_t i = 0; i < size; ++i) {
if(isprint(cstr[i]) && isascii(cstr[i])) {
os << cstr[i];
} else {
os << "\\x" << std::setw(2) << std::setfill('0') << std::hex << (unsigned int)cstr[i];
}
}
return os.str();
}
Array* SymbolTable::all_as_array(STATE) {
utilities::thread::SpinLock::LockGuard guard(lock_);
size_t idx = 0;
Array* ary = Array::create(state, strings.size());
for(SymbolMap::iterator s = symbols.begin(); s != symbols.end(); ++s) {
for(SymbolIds::iterator i = s->second.begin(); i != s->second.end(); ++i) {
ary->set(state, idx++, Symbol::from_index(state, *i));
}
}
return ary;
}
}