Bug 198414 – [WHLSL] Implement arrays and MakeArrayReference

• Component: WebGPU
• Status: RESOLVED FIXED

[Saam Barati]

```int[1000] x;``` fails to compile.

[Saam Barati]

Doing this now.

[Saam Barati]

Created attachment 372664 [details]
WIP

I think it might almost be done. Encountering some checker bugs when I have a function with the same array type in two different variables, which I need to fix.

I think I also need to make this a compile error:
```
int[42] x;
&x
```

[Saam Barati]

Created attachment 372859 [details]
patch

[Myles C. Maxfield]

Comment on attachment 372859 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=372859&action=review

> Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLFunctionWriter.cpp:635
> +        m_stringBuilder.append(makeString(mangledTypeName, ' ', variableName, " = { ", takeLastValue(), ", 1 };\n"));

I know you didn’t change this, but shouldn’t this be 0 if the original pointer is null?

> Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLNativeFunctionWriter.cpp:-178
> -            stringBuilder.append(makeString("    return ", arrayParameterType.numElements(), "u;\n"));

The “u” suffix was to make it an unsigned, in case it’s > 2B

> Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLTypeNamer.cpp:343
> +    return &*iterator;

Isn’t returning a pointer pointing into the array a use after free if something else gets added to the array before you dereference the pointer? I think that’s why I made it an index instead of a pointer.

> LayoutTests/webgpu/whlsl-huge-array.html:97
> +    shouldBe("resultsInt32Array[0]", "1");

Can we update these tests to use the pattern that caides tests to pass if the machine doesn’t support Meta? I’ve migrated all the existing tests.

[Saam Barati]

Comment on attachment 372859 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=372859&action=review

>> Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLFunctionWriter.cpp:635
>> +        m_stringBuilder.append(makeString(mangledTypeName, ' ', variableName, " = { ", takeLastValue(), ", 1 };\n"));
> 
> I know you didn’t change this, but shouldn’t this be 0 if the original pointer is null?

Nice catch. I'll add a test.

>> Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLNativeFunctionWriter.cpp:-178
>> -            stringBuilder.append(makeString("    return ", arrayParameterType.numElements(), "u;\n"));
> 
> The “u” suffix was to make it an unsigned, in case it’s > 2B

That shouldn't matter.

e.g, uint(-1) == UINT_MAX.

Casting from int to uint is a nop

>> Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLTypeNamer.cpp:343
>> +    return &*iterator;
> 
> Isn’t returning a pointer pointing into the array a use after free if something else gets added to the array before you dereference the pointer? I think that’s why I made it an index instead of a pointer.

We're not returning a pointer into the vector. We're calling "operator&" on a UniqueRef

>> LayoutTests/webgpu/whlsl-huge-array.html:97
>> +    shouldBe("resultsInt32Array[0]", "1");
> 
> Can we update these tests to use the pattern that caides tests to pass if the machine doesn’t support Meta? I’ve migrated all the existing tests.

Will do.

[Saam Barati]

Created attachment 373006 [details]
patch for landing

[WebKit Commit Bot]

Comment on attachment 373006 [details]
patch for landing

Clearing flags on attachment: 373006

Committed r246875: <https://trac.webkit.org/changeset/246875>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/52242516>

[Truitt Savell]

It looks like the changes in https://trac.webkit.org/changeset/246875/webkit
Broke two tests:
webgpu/whlsl-huge-array.html
webgpu/whlsl-make-array-reference.html

History:
http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=webgpu%2Fwhlsl-huge-array.html%20webgpu%2Fwhlsl-make-array-reference.html

Diff:
--- /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/webgpu/whlsl-huge-array-expected.txt
+++ /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/webgpu/whlsl-huge-array-actual.txt
@@ -1,4 +1,4 @@
-PASS 
+FAIL 
 PASS successfullyParsed is true
 
 TEST COMPLETE

[Saam Barati]

(In reply to Truitt Savell from comment #10)
> It looks like the changes in https://trac.webkit.org/changeset/246875/webkit
> Broke two tests:
> webgpu/whlsl-huge-array.html
> webgpu/whlsl-make-array-reference.html
> 
> History:
> http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.
> html#showAllRuns=true&tests=webgpu%2Fwhlsl-huge-array.html%20webgpu%2Fwhlsl-
> make-array-reference.html
> 
> Diff:
> ---
> /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/
> webgpu/whlsl-huge-array-expected.txt
> +++
> /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/
> webgpu/whlsl-huge-array-actual.txt
> @@ -1,4 +1,4 @@
> -PASS 
> +FAIL 
>  PASS successfullyParsed is true
>  
>  TEST COMPLETE

We're crashing LLVM in selection DAG:

Process:               MTLCompilerService [65343]
Path:                  /System/Library/Frameworks/Metal.framework/Versions/A/XPCServices/MTLCompilerService.xpc/Contents/MacOS/MTLCompilerService
Identifier:            MTLCompilerService
Version:               125.30 (125.30)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           com.apple.WebKit.WebContent.Development [65337]
User ID:               501

Date/Time:             2019-06-27 09:33:20.165 -0700
OS Version:            Mac OS X 10.13.6 (17G7024)
Report Version:        12
Anonymous UUID:        618B3AF5-9517-D230-2179-6355C81F3E3C


Time Awake Since Boot: 3600000 seconds

System Integrity Protection: enabled

Crashed Thread:        4

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000028
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [0]

VM Regions Near 0x28:
--> 
    __TEXT                 00000001028de000-00000001028e0000 [    8K] r-x/rwx SM=COW  /System/Library/Frameworks/Metal.framework/Versions/A/XPCServices/MTLCompilerService.xpc/Contents/MacOS/MTLCompilerService

Thread 0:
0   libsystem_kernel.dylib        	0x00007fff7496cd9a __semwait_signal_nocancel + 10
1   libsystem_c.dylib             	0x00007fff74871e77 nanosleep$NOCANCEL + 188
2   libsystem_c.dylib             	0x00007fff74898830 sleep$NOCANCEL + 41
3   libdispatch.dylib             	0x00007fff747eec58 _dispatch_queue_cleanup2 + 107
4   libsystem_pthread.dylib       	0x00007fff74b361aa _pthread_tsd_cleanup + 534
5   libsystem_pthread.dylib       	0x00007fff74b35ee9 _pthread_exit + 79
6   libsystem_pthread.dylib       	0x00007fff74b36945 pthread_exit + 30
7   libdispatch.dylib             	0x00007fff747eebc5 dispatch_main + 110
8   libxpc.dylib                  	0x00007fff74b76d1a _xpc_objc_main + 487
9   libxpc.dylib                  	0x00007fff74b759ca xpc_main + 433
10  com.apple.MTLCompilerService  	0x00000001028df135 main + 130
11  libdyld.dylib                 	0x00007fff7481c015 start + 1

Thread 1:: Dispatch queue: com.apple.root.default-qos.overcommit
0   libsystem_kernel.dylib        	0x00007fff7496d022 __sigsuspend_nocancel + 10
1   libdispatch.dylib             	0x00007fff747eecd5 _dispatch_sigsuspend + 21
2   libdispatch.dylib             	0x00007fff747eecc0 _dispatch_sig_thread + 53

Thread 2:
0   libsystem_kernel.dylib        	0x00007fff7496d28a __workq_kernreturn + 10
1   libsystem_pthread.dylib       	0x00007fff74b3420e _pthread_wqthread + 1552
2   libsystem_pthread.dylib       	0x00007fff74b33be9 start_wqthread + 13

Thread 3:
0   libsystem_kernel.dylib        	0x00007fff7496d28a __workq_kernreturn + 10
1   libsystem_pthread.dylib       	0x00007fff74b34009 _pthread_wqthread + 1035
2   libsystem_pthread.dylib       	0x00007fff74b33be9 start_wqthread + 13

Thread 4 Crashed:
0   libLLVM.dylib                 	0x00007fff635e72fe llvm::SelectionDAG::getAtomic(unsigned int, llvm::SDLoc const&, llvm::EVT, llvm::SDValue, llvm::SDValue, llvm::SDValue, llvm::MachineMemOperand*, llvm::AtomicOrdering, llvm::SynchronizationScope) + 90
1   libLLVM.dylib                 	0x00007fff6355bb83 0x7fff62f70000 + 6208387
2   libLLVM.dylib                 	0x00007fff63556292 0x7fff62f70000 + 6185618
3   libLLVM.dylib                 	0x00007fff6356dda9 0x7fff62f70000 + 6282665
4   libLLVM.dylib                 	0x00007fff63570fdd llvm::SelectionDAG::LegalizeTypes() + 57
5   libLLVM.dylib                 	0x00007fff635f9517 llvm::SelectionDAGISel::CodeGenAndEmitDAG() + 343
6   libLLVM.dylib                 	0x00007fff635f8a40 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 2848
7   libLLVM.dylib                 	0x00007fff635f7792 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1186
8   libLLVM.dylib                 	0x00007fff6314496b llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 99
9   libLLVM.dylib                 	0x00007fff632969d1 llvm::FPPassManager::runOnFunction(llvm::Function&) + 279
10  libLLVM.dylib                 	0x00007fff63296b7b llvm::FPPassManager::runOnModule(llvm::Module&) + 49
11  libLLVM.dylib                 	0x00007fff63296ea5 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 577
12  libMTLIntelCompilerPlugin.dylib	0x0000000102a92668 MTLIntelCompiler::generateIGIL(llvm::Module*, MTLIntelFunctionType, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&) + 710
13  libMTLIntelCompilerPlugin.dylib	0x0000000102a863eb MTLCompilerBuildRequest + 288
14  com.apple.MTLCompiler         	0x00007fff67617387 MTLCompilerObject::buildRequest(unsigned int, unsigned int, void const*, unsigned long, void (unsigned int, void const*, unsigned long, char const*) block_pointer) + 10535
15  com.apple.MTLCompilerService  	0x00000001028df0aa compileRequestMain + 52
16  com.apple.MTLCompilerService  	0x00000001028df473 invocation function for block in MTLCompilerServiceHandleEvent(NSObject<OS_xpc_object>*) + 746
17  libxpc.dylib                  	0x00007fff74b71773 _xpc_connection_call_event_handler + 35
18  libxpc.dylib                  	0x00007fff74b6ff31 _xpc_connection_mach_event + 1092
19  libdispatch.dylib             	0x00007fff747e7da9 _dispatch_client_callout4 + 9
20  libdispatch.dylib             	0x00007fff747e8062 _dispatch_mach_msg_invoke + 488
21  libdispatch.dylib             	0x00007fff747f707a _dispatch_queue_serial_drain + 222
22  libdispatch.dylib             	0x00007fff747e6972 _dispatch_mach_invoke + 534
23  libdispatch.dylib             	0x00007fff747f707a _dispatch_queue_serial_drain + 222
24  libdispatch.dylib             	0x00007fff747ea166 _dispatch_queue_invoke + 373
25  libdispatch.dylib             	0x00007fff747f7f0d _dispatch_root_queue_drain_deferred_wlh + 332
26  libdispatch.dylib             	0x00007fff747fbd21 _dispatch_workloop_worker_thread + 880
27  libsystem_pthread.dylib       	0x00007fff74b33fd2 _pthread_wqthread + 980
28  libsystem_pthread.dylib       	0x00007fff74b33be9 start_wqthread + 13

Thread 5:
0   libsystem_kernel.dylib        	0x00007fff7496d28a __workq_kernreturn + 10
1   libsystem_pthread.dylib       	0x00007fff74b34009 _pthread_wqthread + 1035
2   libsystem_pthread.dylib       	0x00007fff74b33be9 start_wqthread + 13

Thread 4 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000029  rcx: 0x0000000000000000  rdx: 0x00007000092d73f0
  rdi: 0x00007fd74a608310  rsi: 0x0000000000000029  rbp: 0x00007000092d73a0  rsp: 0x00007000092d72d0
   r8: 0x0000000000000000   r9: 0x0000000000000000  r10: 0x0000000000000001  r11: 0x0000000000000007
  r12: 0x00007000092d73b0  r13: 0x0000000000000000  r14: 0x00007fd74a608310  r15: 0x00007000092d73c0
  rip: 0x00007fff635e72fe  rfl: 0x0000000000010287  cr2: 0x0000000000000028
  
Logical CPU:     4
Error Code:      0x00000004
Trap Number:     14


Binary Images:
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External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 3354307
    thread_create: 0
    thread_set_state: 1488

VM Region Summary:
ReadOnly portion of Libraries: Total=329.9M resident=0K(0%) swapped_out_or_unallocated=329.9M(100%)
Writable regions: Total=72.4M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=72.4M(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Activity Tracing                   256K        2 
Kernel Alloc Once                    8K        2 
MALLOC                            61.3M       16 
MALLOC guard page                   16K        5 
STACK GUARD                       56.0M        7 
Stack                             10.5M        7 
__DATA                            16.8M      193 
__FONT_DATA                          4K        2 
__LINKEDIT                       195.6M        6 
__TEXT                           134.4M      192 
__UNICODE                          560K        2 
mapped file                       6412K        2 
shared memory                       44K        5 
===========                     =======  ======= 
TOTAL                            481.7M      428

[Saam Barati]

(In reply to Truitt Savell from comment #10)
> It looks like the changes in https://trac.webkit.org/changeset/246875/webkit
> Broke two tests:
> webgpu/whlsl-huge-array.html
> webgpu/whlsl-make-array-reference.html
> 
> History:
> http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.
> html#showAllRuns=true&tests=webgpu%2Fwhlsl-huge-array.html%20webgpu%2Fwhlsl-
> make-array-reference.html
> 
> Diff:
> ---
> /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/
> webgpu/whlsl-huge-array-expected.txt
> +++
> /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/
> webgpu/whlsl-huge-array-actual.txt
> @@ -1,4 +1,4 @@
> -PASS 
> +FAIL 
>  PASS successfullyParsed is true
>  
>  TEST COMPLETE

We're disabling WEBGPU for now on High Sierra:
https://trac.webkit.org/changeset/246888/webkit