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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [testsuite/] [gdb.base/] [watchpoint.c] - Blame information for rev 178

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Line No. Rev Author Line
1 24 jeremybenn
#include <stdio.h>
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#include <unistd.h>
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/*
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 *      Since using watchpoints can be very slow, we have to take some pains to
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 *      ensure that we don't run too long with them enabled or we run the risk
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 *      of having the test timeout.  To help avoid this, we insert some marker
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 *      functions in the execution stream so we can set breakpoints at known
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 *      locations, without worrying about invalidating line numbers by changing
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 *      this file.  We use null bodied functions are markers since gdb does
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 *      not support breakpoints at labeled text points at this time.
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 *
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 *      One place we need is a marker for when we start executing our tests
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 *      instructions rather than any process startup code, so we insert one
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 *      right after entering main().  Another is right before we finish, before
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 *      we start executing any process termination code.
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 *
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 *      Another problem we have to guard against, at least for the test
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 *      suite, is that we need to ensure that the line that causes the
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 *      watchpoint to be hit is still the current line when gdb notices
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 *      the hit.  Depending upon the specific code generated by the compiler,
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 *      the instruction after the one that triggers the hit may be part of
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 *      the same line or part of the next line.  Thus we ensure that there
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 *      are always some instructions to execute on the same line after the
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 *      code that should trigger the hit.
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 */
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int count = -1;
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int ival1 = -1;
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int ival2 = -1;
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int ival3 = -1;
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int ival4 = -1;
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int ival5 = -1;
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char buf[10];
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struct foo
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{
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  int val;
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};
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struct foo struct1, struct2, *ptr1, *ptr2;
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int doread = 0;
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void marker1 ()
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{
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}
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void marker2 ()
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{
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}
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void marker4 ()
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{
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}
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void marker5 ()
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{
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}
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void marker6 ()
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{
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}
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#ifdef PROTOTYPES
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void recurser (int  x)
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#else
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void recurser (x) int  x;
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#endif
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{
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  int  local_x;
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  if (x > 0)
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    recurser (x-1);
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  local_x = x;
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}
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void
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func2 ()
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{
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  int  local_a;
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  static int  static_b;
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  ival5++;
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  local_a = ival5;
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  static_b = local_a;
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}
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void
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func3 ()
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{
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  int x;
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  int y;
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  x = 0;
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  x = 1;                                /* second x assignment */
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  y = 1;
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  y = 2;
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}
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int
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func1 ()
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{
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  /* The point of this is that we will set a breakpoint at this call.
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     Then, if DECR_PC_AFTER_BREAK equals the size of a function call
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     instruction (true on a sun3 if this is gcc-compiled--FIXME we
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     should use asm() to make it work for any compiler, present or
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     future), then we will end up branching to the location just after
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     the breakpoint.  And we better not confuse that with hitting the
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     breakpoint.  */
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  func2 ();
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  return 73;
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}
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int main ()
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{
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#ifdef usestubs
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  set_debug_traps();
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  breakpoint();
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#endif
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  struct1.val = 1;
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  struct2.val = 2;
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  ptr1 = &struct1;
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  ptr2 = &struct2;
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  marker1 ();
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  func1 ();
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  for (count = 0; count < 4; count++) {
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    ival1 = count;
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    ival3 = count; ival4 = count;
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  }
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  ival1 = count; /* Outside loop */
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  ival2 = count;
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  ival3 = count; ival4 = count;
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  marker2 ();
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  if (doread)
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    {
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      static char msg[] = "type stuff for buf now:";
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      write (1, msg, sizeof (msg) - 1);
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      read (0, &buf[0], 5);
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    }
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  marker4 ();
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  /* We have a watchpoint on ptr1->val.  It should be triggered if
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     ptr1's value changes.  */
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  ptr1 = ptr2;
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  /* This should not trigger the watchpoint.  If it does, then we
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     used the wrong value chain to re-insert the watchpoints or we
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     are not evaluating the watchpoint expression correctly.  */
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  struct1.val = 5;
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  marker5 ();
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  /* We have a watchpoint on ptr1->val.  It should be triggered if
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     ptr1's value changes.  */
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  ptr1 = ptr2;
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  /* This should not trigger the watchpoint.  If it does, then we
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     used the wrong value chain to re-insert the watchpoints or we
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     are not evaluating the watchpoint expression correctly.  */
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  struct1.val = 5;
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  marker5 ();
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  /* We're going to watch locals of func2, to see that out-of-scope
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     watchpoints are detected and properly deleted.
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     */
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  marker6 ();
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  /* This invocation is used for watches of a single
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     local variable. */
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  func2 ();
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  /* This invocation is used for watches of an expression
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     involving a local variable. */
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  func2 ();
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  /* This invocation is used for watches of a static
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     (non-stack-based) local variable. */
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  func2 ();
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  /* This invocation is used for watches of a local variable
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     when recursion happens.
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     */
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  marker6 ();
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  recurser (2);
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  marker6 ();
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  func3 ();
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  return 0;
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}

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