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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /js/src/jit/BytecodeAnalysis.h
parentInitial commit. (diff)
downloadfirefox-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/BytecodeAnalysis.h')
-rw-r--r--js/src/jit/BytecodeAnalysis.h83
1 files changed, 83 insertions, 0 deletions
diff --git a/js/src/jit/BytecodeAnalysis.h b/js/src/jit/BytecodeAnalysis.h
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+/* -*- 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_BytecodeAnalysis_h
+#define jit_BytecodeAnalysis_h
+
+#include "jit/JitAllocPolicy.h"
+#include "js/Vector.h"
+#include "vm/JSScript.h"
+
+namespace js {
+namespace jit {
+
+// Basic information about bytecodes in the script. Used to help baseline
+// compilation.
+struct BytecodeInfo {
+ static const uint16_t MAX_STACK_DEPTH = 0xffffU;
+ uint16_t stackDepth;
+ bool initialized : 1;
+ bool jumpTarget : 1;
+
+ // If true, this is a JSOp::LoopHead where we can OSR into Ion/Warp code.
+ bool loopHeadCanOsr : 1;
+
+ // See the comment above normallyReachable in BytecodeAnalysis.cpp for how
+ // this works.
+ bool jumpTargetNormallyReachable : 1;
+
+ // True if the script has a resume offset for this bytecode op.
+ bool hasResumeOffset : 1;
+
+ void init(unsigned depth) {
+ MOZ_ASSERT(depth <= MAX_STACK_DEPTH);
+ MOZ_ASSERT_IF(initialized, stackDepth == depth);
+ initialized = true;
+ stackDepth = depth;
+ }
+
+ void setJumpTarget(bool normallyReachable) {
+ jumpTarget = true;
+ if (normallyReachable) {
+ jumpTargetNormallyReachable = true;
+ }
+ }
+};
+
+class BytecodeAnalysis {
+ JSScript* script_;
+ Vector<BytecodeInfo, 0, JitAllocPolicy> infos_;
+
+ public:
+ explicit BytecodeAnalysis(TempAllocator& alloc, JSScript* script);
+
+ [[nodiscard]] bool init(TempAllocator& alloc);
+
+ BytecodeInfo& info(jsbytecode* pc) {
+ uint32_t pcOffset = script_->pcToOffset(pc);
+ MOZ_ASSERT(infos_[pcOffset].initialized);
+ return infos_[pcOffset];
+ }
+
+ BytecodeInfo* maybeInfo(jsbytecode* pc) {
+ uint32_t pcOffset = script_->pcToOffset(pc);
+ if (infos_[pcOffset].initialized) {
+ return &infos_[pcOffset];
+ }
+ return nullptr;
+ }
+
+ void checkWarpSupport(JSOp op);
+};
+
+// Whether this script uses the frame's environment chain. The result is cached
+// in JitScript and used by WarpBuilder.
+bool ScriptUsesEnvironmentChain(JSScript* script);
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_BytecodeAnalysis_h */