[WebGPU] ShaderModuleImpl::compilationInfo is not implemented

https://bugs.webkit.org/show_bug.cgi?id=263598
<radar://117424136>

Reviewed by Tadeu Zagallo.

Implement getCompilationInfo from WebCore.framework -> WebGPU.framework.

* Source/WebCore/Modules/WebGPU/Implementation/WebGPUShaderModuleImpl.cpp:
(WebCore::WebGPU::convertFromBacking):
(WebCore::WebGPU::compilationInfoCallback):
(WebCore::WebGPU::ShaderModuleImpl::compilationInfo):

Canonical link: https://commits.webkit.org/269725@main

Source/WebCore/Modules/WebGPU/Implementation/WebGPUShaderModuleImpl.cpp

@@ -28,9 +28,14 @@
 
 #if HAVE(WEBGPU_IMPLEMENTATION)
 
+#include "WebGPUCompilationInfo.h"
+#include "WebGPUCompilationMessage.h"
+#include "WebGPUCompilationMessageType.h"
 #include "WebGPUConvertToBackingContext.h"
 #include <WebGPU/WebGPUExt.h>
 
+#include <wtf/BlockPtr.h>
+
 namespace WebCore::WebGPU {
 
 ShaderModuleImpl::ShaderModuleImpl(WebGPUPtr<WGPUShaderModule>&& shaderModule, ConvertToBackingContext& convertToBackingContext)
@@ -41,9 +46,45 @@ ShaderModuleImpl::ShaderModuleImpl(WebGPUPtr<WGPUShaderModule>&& shaderModule, C
 
 ShaderModuleImpl::~ShaderModuleImpl() = default;
 
-void ShaderModuleImpl::compilationInfo(CompletionHandler<void(Ref<CompilationInfo>&&)>&&)
+static CompilationMessageType convertFromBacking(WGPUCompilationMessageType type)
+{
+    switch (type) {
+    case WGPUCompilationMessageType_Error:
+        return CompilationMessageType::Error;
+    case WGPUCompilationMessageType_Warning:
+        return CompilationMessageType::Warning;
+    case WGPUCompilationMessageType_Info:
+        return CompilationMessageType::Info;
+    case WGPUCompilationMessageType_Force32:
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+}
+
+static void compilationInfoCallback(WGPUCompilationInfoRequestStatus status, const WGPUCompilationInfo* compilationInfo, void* userdata)
+{
+    auto block = reinterpret_cast<void(^)(WGPUCompilationInfoRequestStatus, const WGPUCompilationInfo*)>(userdata);
+    block(status, compilationInfo);
+    Block_release(block); // Block_release is matched with Block_copy below in AdapterImpl::requestDevice().
+}
+
+void ShaderModuleImpl::compilationInfo(CompletionHandler<void(Ref<CompilationInfo>&&)>&& callback)
 {
-    // FIXME: Implement this.
+    auto blockPtr = makeBlockPtr([callback = WTFMove(callback)](WGPUCompilationInfoRequestStatus, const WGPUCompilationInfo* compilationInfo) mutable {
+        Vector<Ref<CompilationMessage>> messages;
+        if (!compilationInfo || !compilationInfo->messageCount) {
+            callback(CompilationInfo::create(WTFMove(messages)));
+            return;
+        }
+
+        for (size_t i = 0; i < compilationInfo->messageCount; ++i) {
+            auto& message = compilationInfo->messages[i];
+            messages.append(CompilationMessage::create(String::fromLatin1(message.message), convertFromBacking(message.type), message.lineNum, message.linePos, message.offset, message.length));
+        }
+
+        callback(CompilationInfo::create(WTFMove(messages)));
+    });
+
+    wgpuShaderModuleGetCompilationInfo(m_backing.get(), &compilationInfoCallback, Block_copy(blockPtr.get()));
 }
 
 void ShaderModuleImpl::setLabelInternal(const String& label)