diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /js/src/jit/SafepointIndex.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/jit/SafepointIndex.h')
-rw-r--r-- | js/src/jit/SafepointIndex.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/js/src/jit/SafepointIndex.h b/js/src/jit/SafepointIndex.h new file mode 100644 index 0000000000..ab8ebcb785 --- /dev/null +++ b/js/src/jit/SafepointIndex.h @@ -0,0 +1,76 @@ +/* -*- 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 */ |