gecko/js/src/methodjit/BytecodeAnalyzer.h

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
 * May 28, 2008.
 *
 * The Initial Developer of the Original Code is
 *   Brendan Eich <brendan@mozilla.org>
 *
 * Contributor(s):
 *   David Anderson <danderson@mozilla.com>
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#if !defined jsjaeger_bytecodeAnalyzer_h__ && defined JS_METHODJIT
#define jsjaeger_bytecodeAnalyzer_h__

#include "jsapi.h"
#include "jscntxt.h"
#include "jsscript.h"
#include "jsopcode.h"

namespace js
{
    struct OpcodeStatus
    {
        bool   visited;         /* flag for CFG traversal */
        bool   exceptionEntry;  /* true iff this is a catch/finally entry point */
        bool   safePoint;       /* false by default */
        bool   trap;            /* It's a trap! */
        bool   inTryBlock;      /* true if in try block */
        uint32 nincoming;       /* number of CFG inedges here */
        uint32 stackDepth;      /* stack depth before this opcode */
    };

    class BytecodeAnalyzer
    {
        JSContext    *cx;
        JSScript     *script;
        OpcodeStatus *ops;
        Vector<jsbytecode *, 16, ContextAllocPolicy> doList;

      public:
        BytecodeAnalyzer(JSContext *cx, JSScript *script)
          : cx(cx), script(script), ops(NULL),
            doList(ContextAllocPolicy(cx))
        {
        }
        ~BytecodeAnalyzer();

        bool analyze(uint32 offs);
        bool addEdge(jsbytecode *pc, int32 offset, uint32 stackDepth);

      public:

        inline const OpcodeStatus & operator [](uint32 offs) const {
            JS_ASSERT(offs < script->length);
            return ops[offs];
        }

        inline OpcodeStatus & operator [](uint32 offs) {
            JS_ASSERT(offs < script->length);
            return ops[offs];
        }

        inline const OpcodeStatus & operator [](jsbytecode *pc) const {
            JS_ASSERT(pc < script->code + script->length);
            return ops[pc - script->code];
        }

        inline OpcodeStatus & operator [](jsbytecode *pc) {
            JS_ASSERT(pc < script->code + script->length);
            return ops[pc - script->code];
        }

        inline bool OOM() { return !ops; }

        bool analyze();
    };
}

#endif /* jsjaeger_bytecodeAnalyzer_h__ */