/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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_SafepointIndex_h
#define jit_SafepointIndex_h
#include "mozilla/Assertions.h"
#include <stdint.h>
#include "jit/IonTypes.h"
namespace js {
namespace jit {
class LSafepoint;
class CodegenSafepointIndex;
// Two-tuple that lets you look up the safepoint entry given the
// displacement of a call instruction within the JIT code.
class SafepointIndex {
// The displacement is the distance from the first byte of the JIT'd code
// to the return address (of the call that the safepoint was generated for).
uint32_t displacement_ = 0;
// Offset within the safepoint buffer.
uint32_t safepointOffset_ = 0;
public:
inline explicit SafepointIndex(
const CodegenSafepointIndex& csi);
uint32_t displacement()
const {
return displacement_; }
uint32_t safepointOffset()
const {
return safepointOffset_; }
};
class CodegenSafepointIndex {
uint32_t displacement_ = 0;
LSafepoint* safepoint_ = nullptr;
public:
CodegenSafepointIndex(uint32_t displacement, LSafepoint* safepoint)
: displacement_(displacement), safepoint_(safepoint) {}
LSafepoint* safepoint()
const {
return safepoint_; }
uint32_t displacement()
const {
return displacement_; }
inline SnapshotOffset snapshotOffset()
const;
inline bool hasSnapshotOffset()
const;
};
// The OSI point is patched to a call instruction. Therefore, the
// returnPoint for an OSI call is the address immediately following that
// call instruction. The displacement of that point within the assembly
// buffer is the |returnPointDisplacement|.
class OsiIndex {
uint32_t callPointDisplacement_;
uint32_t snapshotOffset_;
public:
OsiIndex(uint32_t callPointDisplacement, uint32_t snapshotOffset)
: callPointDisplacement_(callPointDisplacement),
snapshotOffset_(snapshotOffset) {}
uint32_t returnPointDisplacement()
const;
uint32_t callPointDisplacement()
const {
return callPointDisplacement_; }
uint32_t snapshotOffset()
const {
return snapshotOffset_; }
};
}
/* namespace jit */
}
/* namespace js */
#endif /* jit_SafepointIndex_h */
