Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/js/src/jit/BytecodeAnalysis.h b/js/src/jit/BytecodeAnalysis.h
new file mode 100644
index 0000000000..a3a9f65ddf
--- /dev/null
+++ b/js/src/jit/BytecodeAnalysis.h
@@ -0,0 +1,83 @@
+/* -*- 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 */