From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- js/src/frontend/ExpressionStatementEmitter.cpp | 54 ++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 js/src/frontend/ExpressionStatementEmitter.cpp (limited to 'js/src/frontend/ExpressionStatementEmitter.cpp') diff --git a/js/src/frontend/ExpressionStatementEmitter.cpp b/js/src/frontend/ExpressionStatementEmitter.cpp new file mode 100644 index 0000000000..bb00c831b1 --- /dev/null +++ b/js/src/frontend/ExpressionStatementEmitter.cpp @@ -0,0 +1,54 @@ +/* -*- 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/. */ + +#include "frontend/ExpressionStatementEmitter.h" + +#include "frontend/BytecodeEmitter.h" +#include "vm/Opcodes.h" + +using namespace js; +using namespace js::frontend; + +using mozilla::Maybe; + +ExpressionStatementEmitter::ExpressionStatementEmitter(BytecodeEmitter* bce, + ValueUsage valueUsage) + : bce_(bce), valueUsage_(valueUsage) {} + +bool ExpressionStatementEmitter::prepareForExpr(uint32_t beginPos) { + MOZ_ASSERT(state_ == State::Start); + + if (!bce_->updateSourceCoordNotes(beginPos)) { + return false; + } + +#ifdef DEBUG + depth_ = bce_->bytecodeSection().stackDepth(); + state_ = State::Expr; +#endif + return true; +} + +bool ExpressionStatementEmitter::emitEnd() { + MOZ_ASSERT(state_ == State::Expr); + MOZ_ASSERT(bce_->bytecodeSection().stackDepth() == depth_ + 1); + + // [stack] VAL + + JSOp op = valueUsage_ == ValueUsage::WantValue ? JSOp::SetRval : JSOp::Pop; + if (!bce_->emit1(op)) { + // [stack] # if WantValue + // [stack] VAL + // [stack] # otherwise + // [stack] + return false; + } + +#ifdef DEBUG + state_ = State::End; +#endif + return true; +} -- cgit v1.2.3