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Initial infrastructure for adding virtual table/table-valued function support to WASM.

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FossilOrigin-Name: c202d7a0398b9aabc2babba5c4c91a313f32bbf37549d419775642bb4aa3936a
This commit is contained in:
stephan
2022-12-05 05:30:03 +00:00
parent 95ade3bdb9
commit e177447972
7 changed files with 269 additions and 67 deletions
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26
ext/wasm/common/whwasmutil.js
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@ -1081,10 +1081,9 @@ self.WhWasmUtilInstaller = function(target){
// impl for allocMainArgv() and scopedAllocMainArgv().
const __allocMainArgv = function(isScoped, list){
if(!list.length) toss("Cannot allocate empty array.");
const pList = target[
isScoped ? 'scopedAlloc' : 'alloc'
](list.length * target.ptrSizeof);
]((list.length + 1) * target.ptrSizeof);
let i = 0;
list.forEach((e)=>{
target.setPtrValue(pList + (target.ptrSizeof * i++),
@ -1092,26 +1091,33 @@ self.WhWasmUtilInstaller = function(target){
isScoped ? 'scopedAllocCString' : 'allocCString'
](""+e));
});
target.setPtrValue(pList + (target.ptrSizeof * i), 0);
return pList;
};
/**
Creates an array, using scopedAlloc(), suitable for passing to a
C-level main() routine. The input is a collection with a length
property and a forEach() method. A block of memory list.length
entries long is allocated and each pointer-sized block of that
memory is populated with a scopedAllocCString() conversion of the
(""+value) of each element. Returns a pointer to the start of the
list, suitable for passing as the 2nd argument to a C-style
main() function.
property and a forEach() method. A block of memory
(list.length+1) entries long is allocated and each pointer-sized
block of that memory is populated with a scopedAllocCString()
conversion of the (""+value) of each element, with the exception
that the final entry is a NULL pointer. Returns a pointer to the
start of the list, suitable for passing as the 2nd argument to a
C-style main() function.
Throws if list.length is falsy or scopedAllocPush() is not active.
Throws if scopedAllocPush() is not active.
Design note: the returned array is allocated with an extra NULL
pointer entry to accommodate certain APIs, but client code which
does not need that functionality should treat the returned array
as list.length entries long.
*/
target.scopedAllocMainArgv = (list)=>__allocMainArgv(true, list);
/**
Identical to scopedAllocMainArgv() but uses alloc() instead of
scopedAllocMainArgv
scopedAlloc().
*/
target.allocMainArgv = (list)=>__allocMainArgv(false, list);