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Memory access from outside with example setup

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This commit is contained in:
Johan B.W. de Vries 2022-06-24 19:48:07 +02:00
parent b28df7fa74
commit 0afab89796
6 changed files with 67 additions and 5 deletions
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54
examples/buffer.html Normal file
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@ -0,0 +1,54 @@
<html>
<head>
<title>Examples - Buffer</title>
</head>
<body>
<h1>Buffer</h1>
<a href="index.html">List</a> - <a href="buffer.py">Source</a> - <a href="buffer.wat">WebAssembly</a>
<div style="white-space: pre;" id="results"></div>
<script type="text/javascript">
let importObject = {};
let results = document.getElementById('results');
WebAssembly.instantiateStreaming(fetch('buffer.wasm'), importObject)
.then(app => {
// Allocate room within the memory of the WebAssembly class
let size = 8;
let offset = app.instance.exports.___new_reference___(4 * size);
var i32 = new Uint32Array(app.instance.exports.memory.buffer, offset, size);
//Fill it
let sum = 0;
for (var i = 0; i < size; i++) {
i32[i] = i;
sum += i;
}
{
let span = document.createElement('span');
span.innerHTML = 'expected result = ' + sum;
results.appendChild(span);
let br = document.createElement('br');
results.appendChild(br);
}
{
let span = document.createElement('span');
span.innerHTML = 'actual result = ' + app.instance.exports.sum(offset);
results.appendChild(span);
let br = document.createElement('br');
results.appendChild(br);
}
for (var i = 0; i < size; i++) {
console.log(i32[i]);
}
});
</script>
</body>
</html>

3
examples/buffer.py Normal file
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@ -0,0 +1,3 @@
@exported
def sum() -> i32: # TODO: Should be [i32] -> i32
return 0 # TODO: Implement me

6
examples/fib.html
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@ -5,7 +5,7 @@
<body> <body>
<h1>Fibonacci</h1> <h1>Fibonacci</h1>
<a href="fib.py">Source</a> - <a href="fib.wat">WebAssembly</a> <a href="index.html">List</a> - <a href="fib.py">Source</a> - <a href="fib.wat">WebAssembly</a>
<div style="white-space: pre;" id="results"></div> <div style="white-space: pre;" id="results"></div>
@ -16,13 +16,13 @@ let importObject = {};
let results = document.getElementById('results'); let results = document.getElementById('results');
WebAssembly.instantiateStreaming(fetch('fib.wasm'), importObject) WebAssembly.instantiateStreaming(fetch('fib.wasm'), importObject)
.then(fib => { .then(app => {
// 93: 7540113804746346429 // 93: 7540113804746346429
// i64: 9223372036854775807 // i64: 9223372036854775807
// 94: 19740274219868223167 // 94: 19740274219868223167
for(let i = BigInt(1); i < 93; ++i) { for(let i = BigInt(1); i < 93; ++i) {
let span = document.createElement('span'); let span = document.createElement('span');
span.innerHTML = 'fib(' + i + ') = ' + fib.instance.exports.fib(i); span.innerHTML = 'fib(' + i + ') = ' + app.instance.exports.fib(i);
results.appendChild(span); results.appendChild(span);
let br = document.createElement('br'); let br = document.createElement('br');
results.appendChild(br); results.appendChild(br);

5
examples/index.html
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@ -4,8 +4,13 @@
</head> </head>
<body> <body>
<h1>Examples</h1> <h1>Examples</h1>
<h2>Standard</h2>
<ul> <ul>
<li><a href="fib.html">Fibonacci</a></li> <li><a href="fib.html">Fibonacci</a></li>
</ul> </ul>
<h2>Technical</h2>
<ul>
<li><a href="buffer.html">Buffer</a></li>
</ul>
</body> </body>
</html> </html>

2
py2wasm/compiler.py
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@ -232,7 +232,7 @@ def module(inp: ourlang.Module) -> wasm.Module:
def _generate_allocator(mod: ourlang.Module) -> wasm.Function: def _generate_allocator(mod: ourlang.Module) -> wasm.Function:
return wasm.Function( return wasm.Function(
'___new_reference___', '___new_reference___',
False, True,
[ [
('alloc_size', type_(mod.types['i32']), ), ('alloc_size', type_(mod.types['i32']), ),
], ],

2
py2wasm/wasm.py
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@ -242,7 +242,7 @@ class ModuleMemory:
self.data = data self.data = data
def generate(self) -> str: def generate(self) -> str:
return '(memory 1)\n (data (memory 0) (i32.const 0) "{}")\n'.format( return '(memory 1)\n (data (memory 0) (i32.const 0) "{}")\n (export "memory" (memory 0))\n'.format(
''.join( ''.join(
f'\\{x:02x}' f'\\{x:02x}'
for x in self.data for x in self.data