michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef jsopcodeinlines_h
michael@0: #define jsopcodeinlines_h
michael@0: 
michael@0: #include "jsopcode.h"
michael@0: 
michael@0: #include "jsscript.h"
michael@0: 
michael@0: namespace js {
michael@0: 
michael@0: static inline unsigned
michael@0: GetDefCount(JSScript *script, unsigned offset)
michael@0: {
michael@0:     jsbytecode *pc = script->offsetToPC(offset);
michael@0: 
michael@0:     /*
michael@0:      * Add an extra pushed value for OR/AND opcodes, so that they are included
michael@0:      * in the pushed array of stack values for type inference.
michael@0:      */
michael@0:     switch (JSOp(*pc)) {
michael@0:       case JSOP_OR:
michael@0:       case JSOP_AND:
michael@0:         return 1;
michael@0:       case JSOP_PICK:
michael@0:         /*
michael@0:          * Pick pops and pushes how deep it looks in the stack + 1
michael@0:          * items. i.e. if the stack were |a b[2] c[1] d[0]|, pick 2
michael@0:          * would pop b, c, and d to rearrange the stack to |a c[0]
michael@0:          * d[1] b[2]|.
michael@0:          */
michael@0:         return pc[1] + 1;
michael@0:       default:
michael@0:         return StackDefs(script, pc);
michael@0:     }
michael@0: }
michael@0: 
michael@0: static inline unsigned
michael@0: GetUseCount(JSScript *script, unsigned offset)
michael@0: {
michael@0:     jsbytecode *pc = script->offsetToPC(offset);
michael@0: 
michael@0:     if (JSOp(*pc) == JSOP_PICK)
michael@0:         return pc[1] + 1;
michael@0:     if (js_CodeSpec[*pc].nuses == -1)
michael@0:         return StackUses(script, pc);
michael@0:     return js_CodeSpec[*pc].nuses;
michael@0: }
michael@0: 
michael@0: static inline JSOp
michael@0: ReverseCompareOp(JSOp op)
michael@0: {
michael@0:     switch (op) {
michael@0:       case JSOP_GT:
michael@0:         return JSOP_LT;
michael@0:       case JSOP_GE:
michael@0:         return JSOP_LE;
michael@0:       case JSOP_LT:
michael@0:         return JSOP_GT;
michael@0:       case JSOP_LE:
michael@0:         return JSOP_GE;
michael@0:       case JSOP_EQ:
michael@0:       case JSOP_NE:
michael@0:       case JSOP_STRICTEQ:
michael@0:       case JSOP_STRICTNE:
michael@0:         return op;
michael@0:       default:
michael@0:         MOZ_ASSUME_UNREACHABLE("unrecognized op");
michael@0:     }
michael@0: }
michael@0: 
michael@0: static inline JSOp
michael@0: NegateCompareOp(JSOp op)
michael@0: {
michael@0:     switch (op) {
michael@0:       case JSOP_GT:
michael@0:         return JSOP_LE;
michael@0:       case JSOP_GE:
michael@0:         return JSOP_LT;
michael@0:       case JSOP_LT:
michael@0:         return JSOP_GE;
michael@0:       case JSOP_LE:
michael@0:         return JSOP_GT;
michael@0:       case JSOP_EQ:
michael@0:         return JSOP_NE;
michael@0:       case JSOP_NE:
michael@0:         return JSOP_EQ;
michael@0:       case JSOP_STRICTNE:
michael@0:         return JSOP_STRICTEQ;
michael@0:       case JSOP_STRICTEQ:
michael@0:         return JSOP_STRICTNE;
michael@0:       default:
michael@0:         MOZ_ASSUME_UNREACHABLE("unrecognized op");
michael@0:     }
michael@0: }
michael@0: 
michael@0: class BytecodeRange {
michael@0:   public:
michael@0:     BytecodeRange(JSContext *cx, JSScript *script)
michael@0:       : script(cx, script), pc(script->code()), end(pc + script->length())
michael@0:     {}
michael@0:     bool empty() const { return pc == end; }
michael@0:     jsbytecode *frontPC() const { return pc; }
michael@0:     JSOp frontOpcode() const { return JSOp(*pc); }
michael@0:     size_t frontOffset() const { return script->pcToOffset(pc); }
michael@0:     void popFront() { pc += GetBytecodeLength(pc); }
michael@0: 
michael@0:   private:
michael@0:     RootedScript script;
michael@0:     jsbytecode *pc, *end;
michael@0: };
michael@0: 
michael@0: }
michael@0: 
michael@0: #endif /* jsopcodeinlines_h */