ADFA-4371: EOFException is reported for empty simpleperf reports

app/src/main/java/com/itsaky/androidide/viewmodel/BuildViewModel.kt

@@ -10,7 +10,6 @@ import com.itsaky.androidide.projects.api.AndroidModule
 import com.itsaky.androidide.projects.builder.BuildService
 import com.itsaky.androidide.projects.isPluginProject
 import com.itsaky.androidide.projects.models.assembleTaskOutputListingFile
-import com.itsaky.androidide.tooling.api.GradlePluginConfig.PROPERTY_PROFILEABLE_ENABLED
 import com.itsaky.androidide.tooling.api.messages.BuildRunType
 import com.itsaky.androidide.tooling.api.messages.GradleBuildParams
 import com.itsaky.androidide.tooling.api.messages.TaskExecutionMessage

profiler/src/main/java/org/appdevforall/cotg/profiler/ProfilerViewModel.kt

@@ -214,7 +214,14 @@ class ProfilerViewModel(application: Application) : AndroidViewModel(application
                     }
                 }
             }.onSuccess { profile ->
-                _state.value = ProfilerUiState.CpuResult(process, profile)
+                if (profile.totalMicros <= 0L || profile.methods.isEmpty()) {
+                    // simpleperf produced no usable samples (e.g. too short a session, idle/dead
+                    // target, or a failed report) — surface a clear message instead of an empty table.
+                    logger.warn("CPU profiling produced no samples for pid={}", process.pid)
+                    setError(R.string.profiler_cpu_no_samples)
+                } else {
+                    _state.value = ProfilerUiState.CpuResult(process, profile)
+                }
             }.onFailure { error ->
                 logger.error("CPU profiling stop/parse failed for pid={}", process.pid, error)
                 setError(getString(R.string.profiler_cpu_failed, error.message ?: error.javaClass.simpleName))

profiler/src/main/java/org/appdevforall/cotg/profiler/cpu/SimpleperfReportParser.kt

@@ -25,6 +25,14 @@ object SimpleperfReportParser {
     private const val MAGIC = "SIMPLEPERF"
     private const val MAX_METHOD_ROWS = 100
 
+    /** Returned when the report stream is empty/truncated (no usable samples). */
+    private val EMPTY_PROFILE =
+        CpuProfile(
+            root = CpuCallNode(name = "(root)", selfMicros = 0, totalMicros = 0, children = emptyList()),
+            totalMicros = 0,
+            methods = emptyList(),
+        )
+
     private class FileEntry(val path: String, val symbols: List<String>)
 
     /** A buffered sample: [weight] (ns) and its callchain as interleaved (fileId, symbolId) pairs. */
@@ -51,12 +59,19 @@ object SimpleperfReportParser {
     fun parse(input: InputStream): CpuProfile {
         val data = DataInputStream(input)
 
+        // An empty/too-short stream means simpleperf produced no report (e.g. a failed or aborted
+        // recording, or a perf.data with no samples that never got written). Treat it as an empty
+        // profile rather than throwing an EOFException.
         val magic = ByteArray(MAGIC.length)
-        data.readFully(magic)
-        require(String(magic, Charsets.US_ASCII) == MAGIC) {
-            "Not a simpleperf report-sample protobuf stream"
+        try {
+            data.readFully(magic)
+            readLe16(data) // format version, not needed
+        } catch (e: EOFException) {
+            return EMPTY_PROFILE
+        }
+        if (String(magic, Charsets.US_ASCII) != MAGIC) {
+            throw IllegalArgumentException("Not a simpleperf report-sample protobuf stream")
         }
-        readLe16(data) // format version, not needed
 
         val files = HashMap<Int, FileEntry>()
         val samples = ArrayList<RawSample>()
@@ -66,7 +81,12 @@ object SimpleperfReportParser {
             val size = readLe32(data) ?: break
             if (size == 0) break
             val bytes = ByteArray(size)
-            data.readFully(bytes)
+            try {
+                data.readFully(bytes)
+            } catch (e: EOFException) {
+                // Truncated stream (e.g. recording killed mid-flush); use whatever was buffered.
+                break
+            }
             val record = SimpleperfReportProto.Record.parseFrom(bytes)
 
             when {

resources/src/main/res/values/strings.xml

@@ -1353,6 +1353,7 @@
     <string name="profiler_cpu_processing">Generating CPU report…</string>
     <string name="profiler_cpu_failed">CPU profiling failed: %1$s</string>
     <string name="profiler_cpu_failed_generic">CPU profiling failed.</string>
+    <string name="profiler_cpu_no_samples">No CPU samples were captured. Try profiling for a bit longer.</string>
     <string name="profiler_col_method">Method</string>
     <string name="profiler_col_total_us">Total (µs)</string>
     <string name="profiler_col_total_pct">Total %</string>