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Minor cleanups and additions in sqlite3.capi.wasm.pstack.

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FossilOrigin-Name: 97bd670d3859bd3f2e62c15065b238b85ef614f26479e56a14be42c5784aedf4
This commit is contained in:
stephan
2022-10-04 01:11:10 +00:00
parent 3c272ba380
commit 2b776ee2d6
6 changed files with 159 additions and 138 deletions
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50
ext/wasm/api/sqlite3-api-glue.js
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@ -560,56 +560,6 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
};
}/*sqlite3_prepare_v2/v3()*/;
if(1){// Extend wasm.pstack, now that the wasm utils are installed
/**
Allocates n chunks, each sz bytes, as a single memory block and
returns the addresses as an array of n element, each holding
the address of one chunk.
Throws a WasmAllocError if allocation fails.
Example:
```
const [p1, p2, p3] = wasm.pstack.allocChunks(3,4);
```
*/
wasm.pstack.allocChunks = (n,sz)=>{
const mem = wasm.pstack.alloc(n * sz);
const rc = [];
let i = 0, offset = 0;
for(; i < n; offset = (sz * ++i)){
rc.push(mem + offset);
}
return rc;
};
/**
A convenience wrapper for allocChunks() which sizes each chunks
as either 8 bytes (safePtrSize is truthy) or wasm.ptrSizeof (if
safePtrSize is falsy).
How it returns its result differs depending on its first
argument: if it's 1, it returns a single pointer value. If it's
more than 1, it returns the same as allocChunks().
When a returned pointers will refer to a 64-bit value, e.g. a
double or int64, and that value must be written or fetched,
e.g. using wasm.setMemValue() or wasm.getMemValue(), it is
important that the pointer in question be aligned to an 8-byte
boundary or else it will not be fetched or written properly and
will corrupt or read neighboring memory.
However, when all pointers involved point to "small" data, it
is safe to pass a falsy value to save to memory.
*/
wasm.pstack.allocPtr = (n=1,safePtrSize=true) =>{
return 1===n
? wasm.pstack.alloc(safePtrSize ? 8 : wasm.ptrSizeof)
: wasm.pstack.allocChunks(n, safePtrSize ? 8 : wasm.ptrSizeof);
};
}/*wasm.pstack filler*/
{/* Import C-level constants and structs... */
const cJson = wasm.xCall('sqlite3_wasm_enum_json');
if(!cJson){