The Tor Browser / file comparison
comparison: js/src/jsopcodeinlines.h
js/src/jsopcodeinlines.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:85662d328dc9 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef jsopcodeinlines_h | |
| 8 #define jsopcodeinlines_h | |
| 9 | |
| 10 #include "jsopcode.h" | |
| 11 | |
| 12 #include "jsscript.h" | |
| 13 | |
| 14 namespace js { | |
| 15 | |
| 16 static inline unsigned | |
| 17 GetDefCount(JSScript *script, unsigned offset) | |
| 18 { | |
| 19 jsbytecode *pc = script->offsetToPC(offset); | |
| 20 | |
| 21 /* | |
| 22 * Add an extra pushed value for OR/AND opcodes, so that they are included | |
| 23 * in the pushed array of stack values for type inference. | |
| 24 */ | |
| 25 switch (JSOp(*pc)) { | |
| 26 case JSOP_OR: | |
| 27 case JSOP_AND: | |
| 28 return 1; | |
| 29 case JSOP_PICK: | |
| 30 /* | |
| 31 * Pick pops and pushes how deep it looks in the stack + 1 | |
| 32 * items. i.e. if the stack were |a b[2] c[1] d[0]|, pick 2 | |
| 33 * would pop b, c, and d to rearrange the stack to |a c[0] | |
| 34 * d[1] b[2]|. | |
| 35 */ | |
| 36 return pc[1] + 1; | |
| 37 default: | |
| 38 return StackDefs(script, pc); | |
| 39 } | |
| 40 } | |
| 41 | |
| 42 static inline unsigned | |
| 43 GetUseCount(JSScript *script, unsigned offset) | |
| 44 { | |
| 45 jsbytecode *pc = script->offsetToPC(offset); | |
| 46 | |
| 47 if (JSOp(*pc) == JSOP_PICK) | |
| 48 return pc[1] + 1; | |
| 49 if (js_CodeSpec[*pc].nuses == -1) | |
| 50 return StackUses(script, pc); | |
| 51 return js_CodeSpec[*pc].nuses; | |
| 52 } | |
| 53 | |
| 54 static inline JSOp | |
| 55 ReverseCompareOp(JSOp op) | |
| 56 { | |
| 57 switch (op) { | |
| 58 case JSOP_GT: | |
| 59 return JSOP_LT; | |
| 60 case JSOP_GE: | |
| 61 return JSOP_LE; | |
| 62 case JSOP_LT: | |
| 63 return JSOP_GT; | |
| 64 case JSOP_LE: | |
| 65 return JSOP_GE; | |
| 66 case JSOP_EQ: | |
| 67 case JSOP_NE: | |
| 68 case JSOP_STRICTEQ: | |
| 69 case JSOP_STRICTNE: | |
| 70 return op; | |
| 71 default: | |
| 72 MOZ_ASSUME_UNREACHABLE("unrecognized op"); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 static inline JSOp | |
| 77 NegateCompareOp(JSOp op) | |
| 78 { | |
| 79 switch (op) { | |
| 80 case JSOP_GT: | |
| 81 return JSOP_LE; | |
| 82 case JSOP_GE: | |
| 83 return JSOP_LT; | |
| 84 case JSOP_LT: | |
| 85 return JSOP_GE; | |
| 86 case JSOP_LE: | |
| 87 return JSOP_GT; | |
| 88 case JSOP_EQ: | |
| 89 return JSOP_NE; | |
| 90 case JSOP_NE: | |
| 91 return JSOP_EQ; | |
| 92 case JSOP_STRICTNE: | |
| 93 return JSOP_STRICTEQ; | |
| 94 case JSOP_STRICTEQ: | |
| 95 return JSOP_STRICTNE; | |
| 96 default: | |
| 97 MOZ_ASSUME_UNREACHABLE("unrecognized op"); | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 class BytecodeRange { | |
| 102 public: | |
| 103 BytecodeRange(JSContext *cx, JSScript *script) | |
| 104 : script(cx, script), pc(script->code()), end(pc + script->length()) | |
| 105 {} | |
| 106 bool empty() const { return pc == end; } | |
| 107 jsbytecode *frontPC() const { return pc; } | |
| 108 JSOp frontOpcode() const { return JSOp(*pc); } | |
| 109 size_t frontOffset() const { return script->pcToOffset(pc); } | |
| 110 void popFront() { pc += GetBytecodeLength(pc); } | |
| 111 | |
| 112 private: | |
| 113 RootedScript script; | |
| 114 jsbytecode *pc, *end; | |
| 115 }; | |
| 116 | |
| 117 } | |
| 118 | |
| 119 #endif /* jsopcodeinlines_h */ |
