1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jsopcodeinlines.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,119 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jsopcodeinlines_h
1.11 +#define jsopcodeinlines_h
1.12 +
1.13 +#include "jsopcode.h"
1.14 +
1.15 +#include "jsscript.h"
1.16 +
1.17 +namespace js {
1.18 +
1.19 +static inline unsigned
1.20 +GetDefCount(JSScript *script, unsigned offset)
1.21 +{
1.22 + jsbytecode *pc = script->offsetToPC(offset);
1.23 +
1.24 + /*
1.25 + * Add an extra pushed value for OR/AND opcodes, so that they are included
1.26 + * in the pushed array of stack values for type inference.
1.27 + */
1.28 + switch (JSOp(*pc)) {
1.29 + case JSOP_OR:
1.30 + case JSOP_AND:
1.31 + return 1;
1.32 + case JSOP_PICK:
1.33 + /*
1.34 + * Pick pops and pushes how deep it looks in the stack + 1
1.35 + * items. i.e. if the stack were |a b[2] c[1] d[0]|, pick 2
1.36 + * would pop b, c, and d to rearrange the stack to |a c[0]
1.37 + * d[1] b[2]|.
1.38 + */
1.39 + return pc[1] + 1;
1.40 + default:
1.41 + return StackDefs(script, pc);
1.42 + }
1.43 +}
1.44 +
1.45 +static inline unsigned
1.46 +GetUseCount(JSScript *script, unsigned offset)
1.47 +{
1.48 + jsbytecode *pc = script->offsetToPC(offset);
1.49 +
1.50 + if (JSOp(*pc) == JSOP_PICK)
1.51 + return pc[1] + 1;
1.52 + if (js_CodeSpec[*pc].nuses == -1)
1.53 + return StackUses(script, pc);
1.54 + return js_CodeSpec[*pc].nuses;
1.55 +}
1.56 +
1.57 +static inline JSOp
1.58 +ReverseCompareOp(JSOp op)
1.59 +{
1.60 + switch (op) {
1.61 + case JSOP_GT:
1.62 + return JSOP_LT;
1.63 + case JSOP_GE:
1.64 + return JSOP_LE;
1.65 + case JSOP_LT:
1.66 + return JSOP_GT;
1.67 + case JSOP_LE:
1.68 + return JSOP_GE;
1.69 + case JSOP_EQ:
1.70 + case JSOP_NE:
1.71 + case JSOP_STRICTEQ:
1.72 + case JSOP_STRICTNE:
1.73 + return op;
1.74 + default:
1.75 + MOZ_ASSUME_UNREACHABLE("unrecognized op");
1.76 + }
1.77 +}
1.78 +
1.79 +static inline JSOp
1.80 +NegateCompareOp(JSOp op)
1.81 +{
1.82 + switch (op) {
1.83 + case JSOP_GT:
1.84 + return JSOP_LE;
1.85 + case JSOP_GE:
1.86 + return JSOP_LT;
1.87 + case JSOP_LT:
1.88 + return JSOP_GE;
1.89 + case JSOP_LE:
1.90 + return JSOP_GT;
1.91 + case JSOP_EQ:
1.92 + return JSOP_NE;
1.93 + case JSOP_NE:
1.94 + return JSOP_EQ;
1.95 + case JSOP_STRICTNE:
1.96 + return JSOP_STRICTEQ;
1.97 + case JSOP_STRICTEQ:
1.98 + return JSOP_STRICTNE;
1.99 + default:
1.100 + MOZ_ASSUME_UNREACHABLE("unrecognized op");
1.101 + }
1.102 +}
1.103 +
1.104 +class BytecodeRange {
1.105 + public:
1.106 + BytecodeRange(JSContext *cx, JSScript *script)
1.107 + : script(cx, script), pc(script->code()), end(pc + script->length())
1.108 + {}
1.109 + bool empty() const { return pc == end; }
1.110 + jsbytecode *frontPC() const { return pc; }
1.111 + JSOp frontOpcode() const { return JSOp(*pc); }
1.112 + size_t frontOffset() const { return script->pcToOffset(pc); }
1.113 + void popFront() { pc += GetBytecodeLength(pc); }
1.114 +
1.115 + private:
1.116 + RootedScript script;
1.117 + jsbytecode *pc, *end;
1.118 +};
1.119 +
1.120 +}
1.121 +
1.122 +#endif /* jsopcodeinlines_h */
