Remove SavePixForCrash and related code

That debugging code uses very much memory and is no longer useful.

    text	   data	    bss	    dec	    hex	filename
     815	      0	 262144	 262959	  4032f	src/ccutil/globaloc.o

Remove also the function err_exit which was only used in ccmain/reject.cpp.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/api/baseapi.cpp

@@ -65,7 +65,6 @@
 #include "environ.h"           // for l_uint8
 #include "equationdetect.h"    // for EquationDetect
 #include "errcode.h"           // for ASSERT_HOST
-#include "globaloc.h"          // for SavePixForCrash, signal_exit
 #include "helpers.h"           // for IntCastRounded, chomp_string
 #include "imageio.h"           // for IFF_TIFF_G4, IFF_TIFF, IFF_TIFF_G3
 #ifndef DISABLED_LEGACY_ENGINE
@@ -254,25 +253,6 @@ size_t TessBaseAPI::getOpenCLDevice(void **data) {
   return 0;
 }
 
-/**
- * Writes the thresholded image to stderr as a PBM file on receipt of a
- * SIGSEGV, SIGFPE, or SIGBUS signal. (Linux/Unix only).
- */
-void TessBaseAPI::CatchSignals() {
-#ifdef __linux__
-  struct sigaction action;
-  memset(&action, 0, sizeof(action));
-  action.sa_handler = &signal_exit;
-  action.sa_flags = SA_RESETHAND;
-  sigaction(SIGSEGV, &action, nullptr);
-  sigaction(SIGFPE, &action, nullptr);
-  sigaction(SIGBUS, &action, nullptr);
-#else
-  // Warn API users that an implementation is needed.
-  tprintf("CatchSignals has no non-linux implementation!\n");
-#endif
-}
-
 /**
  * Set the name of the input file. Needed only for training and
  * loading a UNLV zone file.
@@ -2027,7 +2007,6 @@ bool TessBaseAPI::Threshold(Pix** pix) {
             thresholder_->GetScaledEstimatedResolution(), estimated_res);
   }
   tesseract_->set_source_resolution(estimated_res);
-  SavePixForCrash(estimated_res, *pix);
   return true;
 }
 
@@ -2124,7 +2103,6 @@ void TessBaseAPI::ClearResults() {
     delete paragraph_models_;
     paragraph_models_ = nullptr;
   }
-  SavePixForCrash(0, nullptr);
 }
 
 /**

src/api/baseapi.h

@@ -107,12 +107,6 @@ class TESS_API TessBaseAPI {
    */
   static size_t getOpenCLDevice(void **device);
 
-  /**
-   * Writes the thresholded image to stderr as a PBM file on receipt of a
-   * SIGSEGV, SIGFPE, or SIGBUS signal. (Linux/Unix only).
-   */
-  static void CatchSignals();
-
   /**
    * Set the name of the input file. Needed for training and
    * reading a UNLV zone file, and for searchable PDF output.

src/ccmain/reject.cpp

@@ -1,8 +1,7 @@
 /**********************************************************************
  * File:        reject.cpp  (Formerly reject.c)
  * Description: Rejection functions used in tessedit
- * Author:    Phil Cheatle
+ * Author:      Phil Cheatle
- * Created:   Wed Sep 23 16:50:21 BST 1992
  *
  * (C) Copyright 1992, Hewlett-Packard Ltd.
  ** Licensed under the Apache License, Version 2.0 (the "License");
@@ -45,12 +44,10 @@ int16_t Tesseract::safe_dict_word(const WERD_RES *werd_res) {
 #include "reject.h"
 #include "control.h"
 #include "docqual.h"
-#include "globaloc.h"  // For err_exit.
 #include "helpers.h"
 
 #include "tesseractclass.h"
 
-
 CLISTIZEH (STRING) CLISTIZE (STRING)
 
 /*************************************************************************
@@ -161,7 +158,7 @@ void Tesseract::make_reject_map(WERD_RES *word, ROW *row, int16_t pass) {
     }
   } else {
     tprintf("BAD tessedit_reject_mode\n");
-    err_exit();
+    ASSERT_HOST("Fatal error encountered!" == nullptr);
   }
 
   if (tessedit_image_border > -1)

src/ccutil/errcode.cpp

@@ -74,7 +74,6 @@ const char *format, ...          // special message
     case TESSLOG:
       return;                    //report only
     case TESSEXIT:
-      //err_exit();
     case ABORT:
 #if !defined(NDEBUG)
       // Create a deliberate abnormal exit as the stack trace is more useful

src/ccutil/globaloc.cpp

@@ -2,7 +2,6 @@
  * File:        errcode.cpp  (Formerly error.c)
  * Description: Generic error handler function
  * Author:      Ray Smith
- * Created:     Tue May  1 16:28:39 BST 1990
  *
  * (C) Copyright 1989, Hewlett-Packard Ltd.
  ** Licensed under the Apache License, Version 2.0 (the "License");
@@ -18,64 +17,10 @@
  **********************************************************************/
 
 #include "globaloc.h"
-#include <csignal>
-#ifdef __linux__
-#include <sys/syscall.h>   // For SYS_gettid.
-#include <unistd.h>        // For syscall itself.
-#endif
 #include "allheaders.h"
 #include "errcode.h"
 #include "tprintf.h"
 
-// Size of thread-id array of pixes to keep in case of crash.
-const int kMaxNumThreadPixes = 32768;
-
-static Pix* global_crash_pixes[kMaxNumThreadPixes];
-
-void SavePixForCrash(int resolution, Pix* pix) {
-#ifdef __linux__
-#ifndef ANDROID
-  int thread_id = syscall(SYS_gettid) % kMaxNumThreadPixes;
-#else
-  int thread_id = gettid() % kMaxNumThreadPixes;
-#endif
-  pixDestroy(&global_crash_pixes[thread_id]);
-  if (pix != nullptr) {
-    Pix* clone = pixClone(pix);
-    pixSetXRes(clone, resolution);
-    pixSetYRes(clone, resolution);
-    global_crash_pixes[thread_id] = clone;
-  }
-#endif
-}
-
-// CALL ONLY from a signal handler! Writes a crash image to stderr.
-void signal_exit(int signal_code) {
-  tprintf("Received signal %d!\n", signal_code);
-#ifdef __linux__
-#ifndef ANDROID
-  int thread_id = syscall(SYS_gettid) % kMaxNumThreadPixes;
-#else
-  int thread_id = gettid() % kMaxNumThreadPixes;
-#endif
-  if (global_crash_pixes[thread_id] != nullptr) {
-    fprintf(stderr, "Crash caused by image with resolution %d\n",
-            pixGetYRes(global_crash_pixes[thread_id]));
-    fprintf(stderr, "<Cut here>\n");
-    pixWriteStreamPng(stderr, global_crash_pixes[thread_id], 0.0);
-    fprintf(stderr, "\n<End cut>\n");
-  }
-  // Raise an uncaught signal, so as to get a useful stack trace.
-  raise(SIGILL);
-#else
-  abort();
-#endif
-}
-
-void err_exit() {
-  ASSERT_HOST("Fatal error encountered!" == nullptr);
-}
-
 // TODO: remove empty function?
 void set_global_loc_code(int loc_code) {
   // global_loc_code = loc_code;

src/ccutil/globaloc.h

@@ -19,14 +19,6 @@
 #ifndef GLOBALOC_H
 #define GLOBALOC_H
 
-// Saves a clone of the given pix, and notes its resolution in thread-specific
-// data, so that the image can be written prior to a crash.
-struct Pix;
-void SavePixForCrash(int resolution, Pix* pix);
-
-void signal_exit(int signal_code);
-
-void err_exit();
 
 void set_global_loc_code(int loc_code);