Martin Storsjö <[email protected]> wrote:
> On Fri, 29 May 2026, Kirill Makurin wrote:
>
>> After some testing, I realized that while `HeapSummary` and related
>> types are exposed for UWP compilation even in Microsoft's haeders, it
>> seems like `HeapSummary` is not available in any API set; `dumpbin
>> -imports` lists `HeapSummary` as imported directly from kernel32.dll
>> rather than an API set. This article[1] further confirms it...
>
> It's not the case that everything in UWP must come from an API set DLL.
Is that so? Good to know, then. It really stood out in output of `dumpbin
-imports` that `HeapSummary` was imported directly from kernel32.dll while
everything else is imported from API sets...
> If you look in "App Certification Kit/SupportedAPIs-x64.xml" in a WinSDK
> (I used version 10.0.26100.0), you'll see that it lists HeapSummary as an
> allowed symbol to import directly from kernel32.dll.
I'm pretty sure I checked same `SupportedAPIs-x64.xml` before sending the
patch, which is why I was pretty sure that `HeapSummary` should be available on
UWP.
> (It also lists that the symbol may be imported from
> api-ms-win-core-heap-l1-1-0.dll. Not sure why that's the case; perhaps
> older WinSDK imported it from there, but they stopped for some unknown
> reason?)
In the link I attached, there are references to
`api-ms-win-core-heap-l1-1-0.dll` like this:
```
HeapCreate Introduced into api-ms-win-core-heap-l1-2-0.dll in 10.0.10240.
Moved into api-ms-win-core-heap-l1-1-0.dll in 10.0.16299.
```
In output of `dumpbin -imports` I can see that other heap APIs are imported
from that `api-ms-win-core-heap-l1-1-0.dll`:
```
api-ms-win-core-heap-l1-1-0.dll
180004780 Import Address Table
180004548 Import Name Table
0 time date stamp
0 Index of first forwarder reference
2 HeapAlloc
7 HeapLock
9 HeapReAlloc
A HeapSetInformation
C HeapUnlock
```
Meanwhile...
```
KERNEL32.dll
180004638 Import Address Table
180004400 Import Name Table
0 time date stamp
0 Index of first forwarder reference
38B HeapSummary
```
- Kirill Makurin
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