re PR debug/35065 (infinite loop while compiling VLC media player in vt_find_locations)

        PR debug/35065
        * var-tracking.c (clobber_variable_part): Correctly traverse the
        list.

        * gcc.dg/pr35065.c: New testcase.

From-SVN: r132286

gcc/ChangeLog

+2008-02-13  Michael Matz  <matz@suse.de>
+
+	PR debug/35065
+	* var-tracking.c (clobber_variable_part): Correctly traverse the
+	list.
+
 2008-02-13  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	PR 29673

gcc/testsuite/ChangeLog

+2008-02-13  Michael Matz  <matz@suse.de>
+
+	PR debug/35065
+	* gcc.dg/pr35065.c: New testcase.
+
 2008-02-12  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/35171

gcc/testsuite/gcc.dg/pr35065.c

+/* PR debug/35065 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -g -funroll-loops" } */
+typedef int vlc_bool_t;
+typedef __SIZE_TYPE__ size_t;
+typedef struct vlc_object_t vlc_object_t;
+typedef long long int64_t;
+typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
+typedef int64_t mtime_t;
+typedef uint32_t vlc_fourcc_t;
+typedef struct module_t module_t;
+typedef struct es_format_t es_format_t;
+typedef struct decoder_t decoder_t;
+typedef struct decoder_sys_t decoder_sys_t;
+typedef struct block_t block_t;
+enum vlc_module_properties {
+  VLC_MODULE_CB_OPEN, VLC_MODULE_CB_CLOSE, VLC_MODULE_NAME, };
+struct es_format_t {
+  vlc_fourcc_t i_codec;
+  int i_extra;
+  void *p_extra;
+};
+struct block_t {
+  block_t *p_next;
+  uint32_t i_flags;
+  mtime_t i_pts;
+  mtime_t i_dts;
+  size_t i_buffer;
+  uint8_t *p_buffer;
+};
+static inline block_t *block_Duplicate( block_t *p_block ) {
+  block_t *p_dup = block_New( ((void *)0), p_block->i_buffer );
+  p_dup->i_dts = p_block->i_dts;
+  p_dup->i_pts = p_block->i_pts;
+}
+static inline void block_ChainAppend( block_t **pp_list, block_t *p_block ) {
+  if( *pp_list == ((void *)0) ) {
+  }
+  else {
+    block_t *p = *pp_list;
+    while( p->p_next ) p = p->p_next;
+    p->p_next = p_block;
+  }
+}
+struct decoder_t {
+  decoder_sys_t * p_sys;
+  es_format_t fmt_in;
+};
+typedef struct bs_s {
+  uint8_t *p;
+  uint8_t *p_end;
+  int i_left;
+} bs_t;
+static inline uint32_t bs_read( bs_t *s, int i_count ) {
+  static uint32_t i_mask[33] = {
+    0x00, 0x1fffffff,0x3fffffff,0x7fffffff,0xffffffff};
+  int i_shr;
+  uint32_t i_result = 0;
+  while( i_count > 0 ) {
+    if( s->p >= s->p_end ) {
+      break;
+    }
+    if( ( i_shr = s->i_left - i_count ) >= 0 ) {
+      i_result |= ( *s->p >> i_shr )&i_mask[i_count];
+      s->i_left -= i_count;
+      {
+	s->i_left = 8;
+      }
+      return( i_result );
+    }
+    {
+      i_result |= (*s->p&i_mask[s->i_left]) << -i_shr;
+      i_count -= s->i_left;
+      s->p++;
+    }
+  }
+}
+static inline uint32_t bs_read1( bs_t *s ) {
+  if( s->p < s->p_end ) {
+    unsigned int i_result;
+    s->i_left--;
+    i_result = ( *s->p >> s->i_left )&0x01;
+    if( s->i_left == 0 ) {
+      s->p++;
+    }
+    return i_result;
+  }
+  return 0;
+}
+int Open ( vlc_object_t * );
+static void Close( vlc_object_t * );
+__attribute__((visibility("default"))) int vlc_entry__0_9_0f ( module_t *p_module ) {
+  {
+    module_t *p_submodule = p_module;
+    if (vlc_module_set (p_submodule, VLC_MODULE_CB_OPEN, (void *)(Open)) || vlc_module_set (p_submodule, VLC_MODULE_CB_CLOSE, (void *)(Close))) goto error;
+  }
+ error:
+  return -666;
+}
+typedef struct {
+  int i_nal_type;
+  int i_nal_ref_idc;
+  int i_frame_type;
+  int i_frame_num;
+  int i_bottom_field_flag;
+  int i_idr_pic_id;
+  int i_delta_pic_order_cnt0;
+} slice_t;
+struct decoder_sys_t {
+  vlc_bool_t b_slice;
+  block_t *p_frame;
+  vlc_bool_t b_sps;
+  vlc_bool_t b_pps;
+  vlc_bool_t b_header;
+  block_t *p_sps;
+  block_t *p_pps;
+  int i_pic_order_cnt_type;
+  slice_t slice;
+};
+enum { NAL_SLICE = 1, NAL_SLICE_IDR = 5, NAL_SPS = 7, NAL_AU_DELIMITER= 9 };
+static block_t *ParseNALBlock( decoder_t *, block_t * );
+int Open( vlc_object_t *p_this ) {
+  decoder_t *p_dec = (decoder_t*)p_this;
+  decoder_sys_t *p_sys;
+  if( p_dec->fmt_in.i_codec != ( ((uint32_t)'h') | ( ((uint32_t)'2') << 8 ) | ( ((uint32_t)'6') << 16 ) | ( ((uint32_t)'4') << 24 ) ) && ( p_dec->fmt_in.i_codec != ( ((uint32_t)'a') | ( ((uint32_t)'v') << 8 ) | ( ((uint32_t)'c') << 16 ) | ( ((uint32_t)'1') << 24 ) ) || p_dec->fmt_in.i_extra < 7 ) ) {
+    return -666;
+  }
+  if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == ((void *)0) ) {
+    uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
+    int i_sps, i_pps;
+    int i;
+    i_sps = (*p++)&0x1f;
+    for( i = 0;
+	 i < i_sps;
+	 i++ ) {
+      int i_length = U16_AT( p );
+      block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
+      ParseNALBlock( p_dec, p_sps );
+    }
+  }
+}
+static inline int bs_read_ue( bs_t *s ) {
+  int i = 0;
+  while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 ) {
+    i++;
+  }
+  return( ( 1 << i) - 1 + bs_read( s, i ) );
+}
+static inline int bs_read_se( bs_t *s ) {
+  int val = bs_read_ue( s );
+}
+block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
+{
+  decoder_sys_t *p_sys = p_dec->p_sys;
+  block_t *p_pic = ((void *)0);
+  const int i_nal_type = p_frag->p_buffer[4]&0x1f;
+  if( ( !p_sys->b_sps || !p_sys->b_pps ) && i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR ) {
+  }
+  else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR ) {
+    int i_dec = 0, i_first_mb, i_slice_type;
+    slice_t slice;
+    bs_t s;
+    i_first_mb = bs_read_ue( &s );
+    switch( (i_slice_type = bs_read_ue( &s )) ) {
+    }
+    if( p_sys->i_pic_order_cnt_type == 0 ) {
+      slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
+    }
+    if( slice.i_frame_num != p_sys->slice.i_frame_num
+	|| slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
+      if( (slice.i_bottom_field_flag != -1)
+	  && (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
+	if( p_sys->i_pic_order_cnt_type == 0 && ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
+	  do {
+	    if( !p_sys->b_header && p_sys->slice.i_frame_type != 0x0002)
+	      break;
+	    if( p_sys->slice.i_frame_type == 0x0002 && p_sys->p_sps && p_sys->p_pps ) {
+	      block_t *p_sps = block_Duplicate( p_sys->p_sps );
+	      block_t *p_pps = block_Duplicate( p_sys->p_pps );
+	      p_sps->i_pts = p_sys->p_frame->i_pts;
+	      block_ChainAppend( &p_sps, p_pps );
+	      block_ChainAppend( &p_sps, p_sys->p_frame );
+	      p_sys->b_header = 1;
+	      p_pic = block_ChainGather( p_sps );
+	    }
+	  } while(0);
+  }
+  else if( i_nal_type == NAL_SPS ) {
+    bs_t s;
+    if( p_sys->i_pic_order_cnt_type == 0 ) {
+    }
+    else if( p_sys->i_pic_order_cnt_type == 1 ) {
+      int i_cycle;
+      i_cycle = bs_read_ue( &s );
+      while( i_cycle > 0 ) {
+	bs_read_se(&s );
+      }
+    }
+    bs_read_ue( &s );
+    if( p_sys->b_slice )
+      do {
+	if( !p_sys->b_header && p_sys->slice.i_frame_type != 0x0002)
+	  break;
+	if( p_sys->slice.i_frame_type == 0x0002
+	    && p_sys->p_sps && p_sys->p_pps )
+	  {
+	    block_t *p_sps = block_Duplicate( p_sys->p_sps );
+	    block_t *p_pps = block_Duplicate( p_sys->p_pps );
+	    p_sps->i_dts = p_sys->p_frame->i_dts;
+	    p_sps->i_pts = p_sys->p_frame->i_pts;
+	    block_ChainAppend( &p_sps, p_pps );
+	    block_ChainAppend( &p_sps, p_sys->p_frame );
+	    p_pic = block_ChainGather( p_sps );
+	  }
+	p_pic->i_flags |= p_sys->slice.i_frame_type;
+      } while(0);
+  }
+  block_ChainAppend( &p_sys->p_frame, p_frag );
+}

gcc/var-tracking.c

@@ -2595,6 +2595,8 @@ clobber_variable_part (dataflow_set *set, rtx loc, tree decl,
 			      pool_free (attrs_pool, anode);
 			      *anextp = anext;
 			    }
+			  else
+			    anextp = &anode->next;
 			}
 		    }