Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 318 insertions, 0 deletions

diff --git a/js/src/frontend/CallOrNewEmitter.h b/js/src/frontend/CallOrNewEmitter.h
new file mode 100644
index 0000000000..9469a751a2
--- /dev/null
+++ b/js/src/frontend/CallOrNewEmitter.h
@@ -0,0 +1,318 @@
+/* -*- 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 frontend_CallOrNewEmitter_h
+#define frontend_CallOrNewEmitter_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Maybe.h"
+
+#include <stdint.h>
+
+#include "frontend/ElemOpEmitter.h"
+#include "frontend/IfEmitter.h"
+#include "frontend/PropOpEmitter.h"
+#include "frontend/ValueUsage.h"
+#include "js/TypeDecls.h"
+#include "vm/BytecodeUtil.h"
+#include "vm/Opcodes.h"
+
+namespace js {
+namespace frontend {
+
+struct BytecodeEmitter;
+
+// Class for emitting bytecode for call or new expression.
+//
+// Usage: (check for the return value is omitted for simplicity)
+//
+//   `print(arg);`
+//     CallOrNewEmitter cone(this, JSOp::Call,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     cone.emitNameCallee(print);
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `callee.prop(arg1, arg2);`
+//     CallOrNewEmitter cone(this, JSOp::Call,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     PropOpEmitter& poe = cone.prepareForPropCallee(false);
+//     ... emit `callee.prop` with `poe` here...
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg1);
+//     emit(arg2);
+//     cone.emitEnd(2, Some(offset_of_callee));
+//
+//   `callee[key](arg);`
+//     CallOrNewEmitter cone(this, JSOp::Call,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     ElemOpEmitter& eoe = cone.prepareForElemCallee(false);
+//     ... emit `callee[key]` with `eoe` here...
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `(function() { ... })(arg);`
+//     CallOrNewEmitter cone(this, JSOp::Call,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     cone.prepareForFunctionCallee();
+//     emit(function);
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `super(arg);`
+//     CallOrNewEmitter cone(this, JSOp::Call,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     cone.emitSuperCallee();
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `(some_other_expression)(arg);`
+//     CallOrNewEmitter cone(this, JSOp::Call,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     cone.prepareForOtherCallee();
+//     emit(some_other_expression);
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `print(...arg);`
+//     CallOrNewEmitter cone(this, JSOp::SpreadCall,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     cone.emitNameCallee(print);
+//     cone.emitThis();
+//     if (cone.wantSpreadOperand()) {
+//       emit(arg)
+//     }
+//     cone.emitSpreadArgumentsTest();
+//     emit([...arg]);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `print(...rest);`
+//   where `rest` is rest parameter
+//     CallOrNewEmitter cone(this, JSOp::SpreadCall,
+//                           CallOrNewEmitter::ArgumentsKind::SingleSpreadRest,
+//                           ValueUsage::WantValue);
+//     cone.emitNameCallee(print);
+//     cone.emitThis();
+//     if (cone.wantSpreadOperand()) {
+//       emit(arg)
+//     }
+//     cone.emitSpreadArgumentsTest();
+//     emit([...arg]);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+//   `new f(arg);`
+//     CallOrNewEmitter cone(this, JSOp::New,
+//                           CallOrNewEmitter::ArgumentsKind::Other,
+//                           ValueUsage::WantValue);
+//     cone.emitNameCallee(f);
+//     cone.emitThis();
+//     cone.prepareForNonSpreadArguments();
+//     emit(arg);
+//     cone.emitEnd(1, Some(offset_of_callee));
+//
+class MOZ_STACK_CLASS CallOrNewEmitter {
+ public:
+  enum class ArgumentsKind {
+    Other,
+
+    // Specify this for the following case:
+    //
+    //   function f(...rest) {
+    //     g(...rest);
+    //   }
+    //
+    // This enables optimization to avoid allocating an intermediate array
+    // for spread operation.
+    //
+    // wantSpreadOperand() returns true when this is specified.
+    SingleSpreadRest
+  };
+
+ private:
+  BytecodeEmitter* bce_;
+
+  // The opcode for the call or new.
+  JSOp op_;
+
+  // Whether the call is a spread call with single rest parameter or not.
+  // See the comment in emitSpreadArgumentsTest for more details.
+  ArgumentsKind argumentsKind_;
+
+  // The branch for spread call optimization.
+  mozilla::Maybe<InternalIfEmitter> ifNotOptimizable_;
+
+  mozilla::Maybe<PropOpEmitter> poe_;
+  mozilla::Maybe<ElemOpEmitter> eoe_;
+
+  // The state of this emitter.
+  //
+  // +-------+   emitNameCallee           +------------+
+  // | Start |-+------------------------->| NameCallee |------+
+  // +-------+ |                          +------------+      |
+  //           |                                              |
+  //           | prepareForPropCallee     +------------+      v
+  //           +------------------------->| PropCallee |----->+
+  //           |                          +------------+      |
+  //           |                                              |
+  //           | prepareForElemCallee     +------------+      v
+  //           +------------------------->| ElemCallee |----->+
+  //           |                          +------------+      |
+  //           |                                              |
+  //           | prepareForFunctionCallee +----------------+  v
+  //           +------------------------->| FunctionCallee |->+
+  //           |                          +----------------+  |
+  //           |                                              |
+  //           | emitSuperCallee          +-------------+     v
+  //           +------------------------->| SuperCallee |---->+
+  //           |                          +-------------+     |
+  //           |                                              |
+  //           | prepareForOtherCallee    +-------------+     v
+  //           +------------------------->| OtherCallee |---->+
+  //                                      +-------------+     |
+  //                                                          |
+  // +--------------------------------------------------------+
+  // |
+  // | emitThis +------+
+  // +--------->| This |-+
+  //            +------+ |
+  //                     |
+  // +-------------------+
+  // |
+  // | [!isSpread]
+  // |   prepareForNonSpreadArguments    +-----------+ emitEnd +-----+
+  // +------------------------------->+->| Arguments |-------->| End |
+  // |                                ^  +-----------+         +-----+
+  // |                                |
+  // |                                +----------------------------------+
+  // |                                                                   |
+  // | [isSpread]                                                        |
+  // |   wantSpreadOperand +-------------------+ emitSpreadArgumentsTest |
+  // +-------------------->| WantSpreadOperand |-------------------------+
+  //                       +-------------------+
+  enum class State {
+    // The initial state.
+    Start,
+
+    // After calling emitNameCallee.
+    NameCallee,
+
+    // After calling prepareForPropCallee.
+    PropCallee,
+
+    // After calling prepareForElemCallee.
+    ElemCallee,
+
+    // After calling prepareForFunctionCallee.
+    FunctionCallee,
+
+    // After calling emitSuperCallee.
+    SuperCallee,
+
+    // After calling prepareForOtherCallee.
+    OtherCallee,
+
+    // After calling emitThis.
+    This,
+
+    // After calling wantSpreadOperand.
+    WantSpreadOperand,
+
+    // After calling prepareForNonSpreadArguments.
+    Arguments,
+
+    // After calling emitEnd.
+    End
+  };
+  State state_ = State::Start;
+
+ public:
+  CallOrNewEmitter(BytecodeEmitter* bce, JSOp op, ArgumentsKind argumentsKind,
+                   ValueUsage valueUsage);
+
+ private:
+  MOZ_MUST_USE bool isCall() const {
+    return op_ == JSOp::Call || op_ == JSOp::CallIgnoresRv ||
+           op_ == JSOp::SpreadCall || isEval() || isFunApply() || isFunCall();
+  }
+
+  MOZ_MUST_USE bool isNew() const {
+    return op_ == JSOp::New || op_ == JSOp::SpreadNew;
+  }
+
+  MOZ_MUST_USE bool isSuperCall() const {
+    return op_ == JSOp::SuperCall || op_ == JSOp::SpreadSuperCall;
+  }
+
+  MOZ_MUST_USE bool isEval() const {
+    return op_ == JSOp::Eval || op_ == JSOp::StrictEval ||
+           op_ == JSOp::SpreadEval || op_ == JSOp::StrictSpreadEval;
+  }
+
+  MOZ_MUST_USE bool isFunApply() const { return op_ == JSOp::FunApply; }
+
+  MOZ_MUST_USE bool isFunCall() const { return op_ == JSOp::FunCall; }
+
+  MOZ_MUST_USE bool isSpread() const { return JOF_OPTYPE(op_) == JOF_BYTE; }
+
+  MOZ_MUST_USE bool isSingleSpreadRest() const {
+    return argumentsKind_ == ArgumentsKind::SingleSpreadRest;
+  }
+
+ public:
+  MOZ_MUST_USE bool emitNameCallee(const ParserAtom* name);
+  MOZ_MUST_USE PropOpEmitter& prepareForPropCallee(bool isSuperProp);
+  MOZ_MUST_USE ElemOpEmitter& prepareForElemCallee(bool isSuperElem,
+                                                   bool isPrivateElem);
+  MOZ_MUST_USE bool prepareForFunctionCallee();
+  MOZ_MUST_USE bool emitSuperCallee();
+  MOZ_MUST_USE bool prepareForOtherCallee();
+
+  MOZ_MUST_USE bool emitThis();
+
+  // Used by BytecodeEmitter::emitPipeline to reuse CallOrNewEmitter instance
+  // across multiple chained calls.
+  void reset();
+
+  MOZ_MUST_USE bool prepareForNonSpreadArguments();
+
+  // See the usage in the comment at the top of the class.
+  MOZ_MUST_USE bool wantSpreadOperand();
+  MOZ_MUST_USE bool emitSpreadArgumentsTest();
+
+  // Parameters are the offset in the source code for each character below:
+  //
+  //   callee(arg);
+  //   ^
+  //   |
+  //   beginPos
+  //
+  // Can be Nothing() if not available.
+  MOZ_MUST_USE bool emitEnd(uint32_t argc,
+                            const mozilla::Maybe<uint32_t>& beginPos);
+};
+
+} /* namespace frontend */
+} /* namespace js */
+
+#endif /* frontend_CallOrNewEmitter_h */