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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef jit_BaselineInspector_h
#define jit_BaselineInspector_h

#ifdef JS_ION

#include "jit/BaselineIC.h"
#include "jit/BaselineJIT.h"
#include "jit/MIR.h"

namespace js {
namespace jit {

class BaselineInspector;

class ICInspector
{
  protected:
    BaselineInspector* inspector_;
    jsbytecode* pc_;
    ICEntry* icEntry_;

    ICInspector(BaselineInspector* inspector, jsbytecode* pc, ICEntry* icEntry)
      : inspector_(inspector), pc_(pc), icEntry_(icEntry)
    { }
};

class SetElemICInspector : public ICInspector
{
  public:
    SetElemICInspector(BaselineInspector* inspector, jsbytecode* pc, ICEntry* icEntry)
      : ICInspector(inspector, pc, icEntry)
    { }

    bool sawOOBDenseWrite() const;
    bool sawOOBTypedArrayWrite() const;
    bool sawDenseWrite() const;
    bool sawTypedArrayWrite() const;
};

class BaselineInspector
{
  private:
    JSScript* script;
    ICEntry* prevLookedUpEntry;

  public:
    BaselineInspector(JSScript* script)
      : script(script), prevLookedUpEntry(nullptr)
    {
        JS_ASSERT(script);
    }

    bool hasBaselineScript() const {
        return script->hasBaselineScript();
    }

    BaselineScript* baselineScript() const {
        return script->baselineScript();
    }

  private:
#ifdef DEBUG
    bool isValidPC(jsbytecode* pc) {
        return script->containsPC(pc);
    }
#endif

    ICEntry& icEntryFromPC(jsbytecode* pc) {
        JS_ASSERT(hasBaselineScript());
        JS_ASSERT(isValidPC(pc));
        ICEntry& ent = baselineScript()->icEntryFromPCOffset(script->pcToOffset(pc), prevLookedUpEntry);
        JS_ASSERT(ent.isForOp());
        prevLookedUpEntry = &ent;
        return ent;
    }

    template <typename ICInspectorType>
    ICInspectorType makeICInspector(jsbytecode* pc, ICStub::Kind expectedFallbackKind) {
        ICEntry* ent = nullptr;
        if (hasBaselineScript()) {
            ent = &icEntryFromPC(pc);
            JS_ASSERT(ent->fallbackStub()->kind() == expectedFallbackKind);
        }
        return ICInspectorType(this, pc, ent);
    }

    ICStub* monomorphicStub(jsbytecode* pc);
    bool dimorphicStub(jsbytecode* pc, ICStub** pfirst, ICStub** psecond);

  public:
    typedef Vector<Shape*, 4, IonAllocPolicy> ShapeVector;
    bool maybeShapesForPropertyOp(jsbytecode* pc, ShapeVector& shapes);

    SetElemICInspector setElemICInspector(jsbytecode* pc) {
        return makeICInspector<SetElemICInspector>(pc, ICStub::SetElem_Fallback);
    }

    MIRType expectedResultType(jsbytecode* pc);
    MCompare::CompareType expectedCompareType(jsbytecode* pc);
    MIRType expectedBinaryArithSpecialization(jsbytecode* pc);

    bool hasSeenNonNativeGetElement(jsbytecode* pc);
    bool hasSeenNegativeIndexGetElement(jsbytecode* pc);
    bool hasSeenAccessedGetter(jsbytecode* pc);
    bool hasSeenDoubleResult(jsbytecode* pc);
    bool hasSeenNonStringIterNext(jsbytecode* pc);

    JSObject* getTemplateObject(jsbytecode* pc);
    JSObject* getTemplateObjectForNative(jsbytecode* pc, Native native);

    DeclEnvObject* templateDeclEnvObject();
    CallObject* templateCallObject();

    JSObject* commonGetPropFunction(jsbytecode* pc, Shape** lastProperty, JSFunction** commonGetter);
    JSObject* commonSetPropFunction(jsbytecode* pc, Shape** lastProperty, JSFunction** commonSetter);
};

} // namespace jit
} // namespace js

#endif // JS_ION

#endif /* jit_BaselineInspector_h */