From 37065ba237f0d5d673d69f4a4752da1870d578e5 Mon Sep 17 00:00:00 2001
From: Simon Sobisch <simonsobisch@web.de>
Date: Sun, 5 Nov 2023 18:07:25 +0000
Subject: [PATCH] reduce floodding debug output

suppress debug output for invalid address passed to `memoryRead`
if it is identical to the last recognized invalid one
---
 app/perfunwind.cpp | 5 ++++-
 app/perfunwind.h   | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/app/perfunwind.cpp b/app/perfunwind.cpp
index c1ad49f..a87bef0 100644
--- a/app/perfunwind.cpp
+++ b/app/perfunwind.cpp
@@ -115,7 +115,10 @@ static bool memoryRead(Dwfl *dwfl, Dwarf_Addr addr, Dwarf_Word *result, void *ar
 
     /* Check overflow. */
     if (addr + sizeof(Dwarf_Word) < addr) {
-        qDebug() << "Invalid memory read requested by dwfl" << Qt::hex << addr;
+        if (ui->lastInvalidAddr != addr) {
+            qDebug() << "Invalid memory read requested by dwfl" << Qt::hex << addr;
+            ui->lastInvalidAddr = addr;
+        }
         ui->firstGuessedFrame = ui->frames.length();
         return false;
     }
diff --git a/app/perfunwind.h b/app/perfunwind.h
index 35e33fd..eea7378 100644
--- a/app/perfunwind.h
+++ b/app/perfunwind.h
@@ -103,6 +103,7 @@ class PerfUnwind : public QObject
         QHash<qint32, QHash<quint64, Dwarf_Word>> stackValues;
         QVector<qint32> frames;
         PerfUnwind *unwind;
+        Dwarf_Addr lastInvalidAddr;
         const PerfRecordSample *sample;
         int maxFrames;
         int firstGuessedFrame;