mirror of
https://github.com/i-net-software/JWebAssembly.git
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84 lines
2.9 KiB
Java
84 lines
2.9 KiB
Java
/*
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Copyright 2020 Volker Berlin (i-net software)
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package de.inetsoftware.jwebassembly.module;
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import de.inetsoftware.jwebassembly.api.annotation.WasmTextCode;
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/**
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* Code that will directly embedded in the compiler output. The code can be written in Java or via Wat code. This is not
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* a replacement of runtime API. It emulate the behavior of the Java VM.
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* <p>
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* The class should not have any references to classes of the JWebAssembly compiler to prevent that parts of the
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* compiler will be embedded.
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*
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* @author Volker Berlin
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*/
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class WasmEmbbeddedCode {
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/**
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* Integer division that throw an ArithmeticException on a division by zero instead a trap of the WebAssembly
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* engine.
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*
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* @param quotient
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* the quotient of the operation
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* @param divisor
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* the divisor of the operation
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* @return the result
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*/
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@WasmTextCode( "local.get 1 " + //
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"i32.eqz " + //
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"if " + //
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"call $de/inetsoftware/jwebassembly/module/WasmEmbbeddedCode.createDivByZero()Ljava/lang/ArithmeticException; " + //
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"throw " + //
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"end " + //
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"local.get 0 " + //
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"local.get 1 " + //
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"i32.div_s " + //
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"return" )
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static native int idiv( int quotient, int divisor );
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/**
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* Long division that throw an ArithmeticException on a division by zero instead a trap of the WebAssembly engine.
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*
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* @param quotient
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* the quotient
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* @param divisor
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* the divisior
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* @return the result
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*/
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@WasmTextCode( "local.get 1 " + //
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"i64.eqz " + //
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"if " + //
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"call $de/inetsoftware/jwebassembly/module/WasmEmbbeddedCode.createDivByZero()Ljava/lang/ArithmeticException; " + //
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"throw " + //
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"end " + //
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"local.get 0 " + //
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"local.get 1 " + //
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"i64.div_s " + //
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"return" )
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static native long ldiv( long quotient, long divisor );
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/**
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* Create an ArithmeticException with message "/ by zero"
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*
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* @return the exception
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*/
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static ArithmeticException createDivByZero() {
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return new ArithmeticException( "/ by zero" );
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}
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}
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