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separate the native WASM code in a separate package

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This commit is contained in:
Volker Berlin 2020-09-26 18:43:41 +02:00
parent ad1ea166dd
commit a74563c5d1
4 changed files with 147 additions and 107 deletions
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101
src/de/inetsoftware/jwebassembly/module/StringManager.java
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@ -75,10 +75,10 @@ public class StringManager extends LinkedHashMap<String, Integer> {
@Nonnull
FunctionName getStringConstantFunction() {
if( stringConstantFunction == null ) {
stringConstantFunction = new FunctionName( "de/inetsoftware/jwebassembly/module/StringManager.stringConstant(I)Ljava/lang/String;" );
stringConstantFunction = new FunctionName( "de/inetsoftware/jwebassembly/module/nativecode/StringTable.stringConstant(I)Ljava/lang/String;" );
// register the function stringsMemoryOffset() as synthetic function
WatCodeSyntheticFunctionName offsetFunction =
new WatCodeSyntheticFunctionName( "de/inetsoftware/jwebassembly/module/StringManager", "stringsMemoryOffset", "()I", "", null, ValueType.i32 ) {
new WatCodeSyntheticFunctionName( "de/inetsoftware/jwebassembly/module/nativecode/StringTable", "stringsMemoryOffset", "()I", "", null, ValueType.i32 ) {
protected String getCode() {
return "i32.const " + stringMemoryOffset;
}
@ -176,101 +176,4 @@ public class StringManager extends LinkedHashMap<String, Integer> {
} while( value != 0 );
}
/**
* WASM code<p>
* Get a constant string from the table.
*
* @param strIdx
* the id/index of the string.
* @return the string
* @see #STRING_CONSTANT_FUNCTION
*/
static String stringConstant( int strIdx ) {
String str = getStringFromTable( strIdx );
if( str != null ) {
return str;
}
// read the compact string length
int offset = getIntFromMemory( strIdx * 4 + stringsMemoryOffset() );
int length = 0;
int b;
int shift = 0;
do {
b = getUnsignedByteFromMemory( offset++ );
length += (b & 0x7F) << shift;
shift += 7;
} while( b >= 0x80 );
// copy the bytes from the data section
byte[] bytes = new byte[length];
for( int i = 0; i < length; i++ ) {
bytes[i] = getUnsignedByteFromMemory( i + offset );
}
str = new String( bytes );
// save the string for future use
setStringIntoTable( strIdx, str );
return str;
}
/**
* WASM code<p>
* Get a string from the string table. Should be inlined from the optimizer.
*
* @param strIdx
* the id/index of the string.
* @return the string or null if not already set.
*/
@WasmTextCode( "local.get 0 " + //
"table.get 1 " + //
"return" )
private static native String getStringFromTable( int strIdx );
/**
* WASM code<p>
* Set a string in the string table. Should be inlined from the optimizer.
*
* @param strIdx
* the id/index of the string.
* @param str
* the string
*/
@WasmTextCode( "local.get 0 " + //
"local.get 1 " + //
"table.set 1 " + //
"return" )
private static native void setStringIntoTable( int strIdx, String str );
/**
* WASM code<p>
* Placeholder for a synthetic function. Should be inlined from the optimizer.
* @return the memory offset of the serialized string data in the element section
*/
private static native int stringsMemoryOffset();
/**
* WASM code<p>
* Load an i32 from memory. The offset must be aligned. Should be inlined from the optimizer.
*
* @param pos
* the memory position
* @return the value from the memory
*/
@WasmTextCode( "local.get 0 " + //
"i32.load offset=0 align=4 " + //
"return" )
private static native int getIntFromMemory( int pos );
/**
* WASM code<p>
* Load a byte from the memory. Should be inlined from the optimizer.
*
* @param pos
* the memory position
* @return the value from the memory
*/
@WasmTextCode( "local.get 0 " + //
"i32.load8_u offset=0 " + //
"return" )
private static native byte getUnsignedByteFromMemory( int pos );
}

8
src/de/inetsoftware/jwebassembly/module/TypeManager.java
View File

@ -67,22 +67,22 @@ public class TypeManager {
/**
* Byte position in the type description that contains the offset to the interfaces. Length 4 bytes.
*/
static final int TYPE_DESCRIPTION_INTERFACE_OFFSET = 0;
public static final int TYPE_DESCRIPTION_INTERFACE_OFFSET = 0;
/**
* Byte position in the type description that contains the offset to the instanceof list. Length 4 bytes.
*/
static final int TYPE_DESCRIPTION_INSTANCEOF_OFFSET = 4;
public static final int TYPE_DESCRIPTION_INSTANCEOF_OFFSET = 4;
/**
* Byte position in the type description that contains the offset to class name idx in the string constant table. Length 4 bytes.
*/
static final int TYPE_DESCRIPTION_TYPE_NAME = 8;
public static final int TYPE_DESCRIPTION_TYPE_NAME = 8;
/**
* Byte position in the type description that contains the type of the array (component type). Length 4 bytes.
*/
public static final int TYPE_DESCRIPTION_ARRAY_TYPE = 12;
public static final int TYPE_DESCRIPTION_ARRAY_TYPE = 12;
/**
* The reserved position on start of the vtable:

20
src/de/inetsoftware/jwebassembly/module/ReplacementForClass.java → src/de/inetsoftware/jwebassembly/module/nativecode/ReplacementForClass.java
View File

@ -14,12 +14,24 @@
limitations under the License.
*/
package de.inetsoftware.jwebassembly.module;
package de.inetsoftware.jwebassembly.module.nativecode;
import static de.inetsoftware.jwebassembly.module.TypeManager.BOOLEAN;
import static de.inetsoftware.jwebassembly.module.TypeManager.BYTE;
import static de.inetsoftware.jwebassembly.module.TypeManager.CHAR;
import static de.inetsoftware.jwebassembly.module.TypeManager.DOUBLE;
import static de.inetsoftware.jwebassembly.module.TypeManager.FLOAT;
import static de.inetsoftware.jwebassembly.module.TypeManager.INT;
import static de.inetsoftware.jwebassembly.module.TypeManager.LONG;
import static de.inetsoftware.jwebassembly.module.TypeManager.SHORT;
import static de.inetsoftware.jwebassembly.module.TypeManager.TYPE_DESCRIPTION_ARRAY_TYPE;
import static de.inetsoftware.jwebassembly.module.TypeManager.TYPE_DESCRIPTION_INSTANCEOF_OFFSET;
import static de.inetsoftware.jwebassembly.module.TypeManager.TYPE_DESCRIPTION_TYPE_NAME;
import static de.inetsoftware.jwebassembly.module.TypeManager.VOID;
import de.inetsoftware.jwebassembly.api.annotation.Replace;
import de.inetsoftware.jwebassembly.api.annotation.WasmTextCode;
import static de.inetsoftware.jwebassembly.module.TypeManager.*;
import de.inetsoftware.jwebassembly.module.TypeManager;
/**
* Replacement for java.lang.Class
@ -47,7 +59,7 @@ class ReplacementForClass {
* @return the name
*/
String getName() {
return StringManager.stringConstant( getIntFromMemory( vtable + TYPE_DESCRIPTION_TYPE_NAME ) );
return StringTable.stringConstant( getIntFromMemory( vtable + TYPE_DESCRIPTION_TYPE_NAME ) );
}
/**

125
src/de/inetsoftware/jwebassembly/module/nativecode/StringTable.java Normal file
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@ -0,0 +1,125 @@
/*
Copyright 2020 Volker Berlin (i-net software)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package de.inetsoftware.jwebassembly.module.nativecode;
import de.inetsoftware.jwebassembly.api.annotation.WasmTextCode;
/**
* The WASm string table to create String constant on the fly and hold it.
*
* @author Volker Berlin
*/
class StringTable {
/**
* WASM code<p>
* Get a constant string from the table.
*
* @param strIdx
* the id/index of the string.
* @return the string
* @see #STRING_CONSTANT_FUNCTION
*/
static String stringConstant( int strIdx ) {
String str = getStringFromTable( strIdx );
if( str != null ) {
return str;
}
// read the compact string length
int offset = getIntFromMemory( strIdx * 4 + stringsMemoryOffset() );
int length = 0;
int b;
int shift = 0;
do {
b = getUnsignedByteFromMemory( offset++ );
length += (b & 0x7F) << shift;
shift += 7;
} while( b >= 0x80 );
// copy the bytes from the data section
byte[] bytes = new byte[length];
for( int i = 0; i < length; i++ ) {
bytes[i] = getUnsignedByteFromMemory( i + offset );
}
str = new String( bytes );
// save the string for future use
setStringIntoTable( strIdx, str );
return str;
}
/**
* WASM code<p>
* Get a string from the string table. Should be inlined from the optimizer.
*
* @param strIdx
* the id/index of the string.
* @return the string or null if not already set.
*/
@WasmTextCode( "local.get 0 " + //
"table.get 1 " + //
"return" )
private static native String getStringFromTable( int strIdx );
/**
* WASM code<p>
* Set a string in the string table. Should be inlined from the optimizer.
*
* @param strIdx
* the id/index of the string.
* @param str
* the string
*/
@WasmTextCode( "local.get 0 " + //
"local.get 1 " + //
"table.set 1 " + //
"return" )
private static native void setStringIntoTable( int strIdx, String str );
/**
* WASM code<p>
* Placeholder for a synthetic function. Should be inlined from the optimizer.
* @return the memory offset of the serialized string data in the element section
*/
private static native int stringsMemoryOffset();
/**
* WASM code<p>
* Load an i32 from memory. The offset must be aligned. Should be inlined from the optimizer.
*
* @param pos
* the memory position
* @return the value from the memory
*/
@WasmTextCode( "local.get 0 " + //
"i32.load offset=0 align=4 " + //
"return" )
private static native int getIntFromMemory( int pos );
/**
* WASM code<p>
* Load a byte from the memory. Should be inlined from the optimizer.
*
* @param pos
* the memory position
* @return the value from the memory
*/
@WasmTextCode( "local.get 0 " + //
"i32.load8_u offset=0 " + //
"return" )
private static native byte getUnsignedByteFromMemory( int pos );
}