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  • FAQ
  • +a.b silicon into a x.y silicon target: FAQ
  • +accel_xxxx: FAQ
  • +ADC & DAC in audio application: FAQ
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  • -CCES: FAQ's
    • FAQ: An alternative way to use heap_lookup_name in CCES
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    • FAQ: How can I view peripheral registers on the Cortex-A55 core (ADSP-SC598 family)?
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    • FAQ: How do you upgrade UCOS version on CCES
    • FAQ: How Does CCES Node Locked Maintenance License Work
    • FAQ: How is debugging the ADSP-SC598 family of processors containing Cortex-A55 different than Cortex-A5 processors?
    • FAQ: How to find the size of program in CCES?
    • FAQ: How to get PDF version CCES compiler, linker, loader manuals?
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    • FAQ: Memory bank problem about 21489 in CCES
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    • FAQ: Using CrossCore Embedded Studio's CCES Runner Utility
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    • FAQ: What are board support packages, and do I need one?
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    • FAQ: Where can I find Example Projects and Code Sketches in CCES?
    • FAQ: Where can I find my license.dat file in CrossCore Embedded Studio?
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    • FAQ: Why do I always find additional files called "system.svc" and "adi_initialize.{h|c}" in my CCES project?
    • FAQ: Why do I encounter the error ‘A valid license could be found’ on starting CrossCore Embedded Studio?
    • FAQ: Why do I receive, “There was a problem installing the license for this serial number. The serial number has already been used and can be installed only once”?
    • FAQ: Why is C/C++ compiler switch -Og missing in CCES?
    • FAQs: Heap Debugging
    • What is the procedure for getting CCES / VDSP license key when customer lost the purchased license?
    • [FAQ] : Does CCES support programming ADuCM355 Controller?
    • [FAQ] : Get timestamp in CCES using command line
    • [FAQ] : How can I create a copy of example project available in CCES/BSP into the workspace instead of importing example project directly from installation path?
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    • [FAQ] : PGO in CCES
    • [FAQ] : What could be the reason for getting network outage issue while activating CCES license
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    • [FAQ]: Support for eclipse plugins in CCES
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    • [FAQ]:Is Exclusive-access built-in functions
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  • +EXTCLK_MODE: FAQ
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  • +How to build a specific code from single source file for a specific core?
  • +How to convert long double into string: FAQ
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  • +SigmaStudioForSHARC: FAQ
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  • +VisualDSP++: FAQ
  • +Wakeup processor from Hibernate: FAQ
  • +When callback occurs: FAQ
  • +word addressable program: FAQ
  • [FAQ] : Difference between ADZS-HPUSB and ADZS-USB ICE
  • [FAQ] : Does ICE-1000 supported ADSP-CM407F?
  • +[FAQ] : Driver example for Timer windowed watchdog period mode.
  • [FAQ] : Example code for SPORT slave trigger in ADSP-21569 Ezkit
  • +[FAQ] : How to access darkmode appearance in CCES?
  • [FAQ] : Is it possible to perform stepping into the code in CCES Runner.
  • [FAQ] : Is there a way to list symbols from library (*.dlb) file?
  • [FAQ] : sizeof() built-in function in BF and Sharc processors
  • [FAQ] : Streaming Data input and output in CCES
  • [FAQ] : UART sample driver code for BF706mini
  • [FAQ]: Difference between Debug and Release configurations
  • [FAQ]: How to use "log10f_simd"
  • +µCOS-III Add-In: FAQ

FAQs: Heap Debugging

Q: Can I debug libraries or objects I don't have the source for?

A: Yes, the debugging works by linking in an alternative run-time library, so the debugging will cover any linked sources.

----------------------------------------------------

 

Q: What's the performance like?

A: Obviously, there will be a performance impact, though we've tried to keep it to a minimum without affecting the function of the library. For each heap operation, additional checks will be carried out for validity, including a scan of the heap for corruption, so there will be a significant impact when debugging heavily used heaps.

The performance impact can be mitigated in 2 ways:

Selective debugging:

The debugging can be paused and re-enabled at run time via a function call, allowing you to debug parts of your application at once, or to avoid the overhead in critical sections which you are satisfied are ok.

I/O Buffering

The debugging library by default writes to an output file on each heap operation, which can be very time intensive. Buffering this output means that less I/O calls are performed, saving the set-up and transfer time for the I/O operation.

----------------------------------------------------

 

Q: What if I don't want a report file?

A: Report file generation can be turned off using adi_heap_debug_disable(_HEAP_HPL_GEN). stderr reporting can be enabled in its place via adi_heap_debug_enable(_HEAP_STDERR_DIAG).

Q: Can I find out the current state of the heap?

A: A function, adi_heap_debug_dump_heap(filename, heapindex), is provided which will print a dump of the current state of the specified heap to the specified text file.

*Note: The dump doesn't include memory used by the heap debugging or run-time libraries.

----------------------------------------------------

 

Q: Can I find out if the heap is currently corrupt?

A: A function, adi_verify_heap(heapindex) will return true if the heap is currently valid, false otherwise.

----------------------------------------------------

 

Q: I've turned on heap debugging and now get unexpected values in my data, what's happened?

A: The debugging library pre-fills heap data which shouldn't be read with a known bit pattern: 0xBD for free/unused heap space, 0xDD for allocated space that has been uninitialized, and 0xED for guard regions around allocated blocks.

0xBD in your data would indicate reading from de-allocated memory,

0xDD in your data would indicate reading from allocated memory that hasn't been initialized yet,

0xED in your data would indicate reading beyond the scope of the allocated block (buffer underflow or overflow).

These patterns are deliberately misaligned so as to trigger a misaligned data exception on Blackfin, if used as a pointer.

----------------------------------------------------

 

Q: What are realloc_free and realloc_alloc operations?

A: The debugging library splits a call to realloc() into 2 components; the allocation and the free, reporting each separately. Even if there is space to re-use the block, the debug realloc will always allocate new memory, copy the data over and then de-allocate the memory, to catch the case where reads from the old pointer happen to work when the block is re-used.

i.e.:

int *x,*y,z;

x = malloc(12);

*x = 1;

y = realloc(x, 4);

z = *x;

if x is re-used then z==1, otherwise it is uninitialized. With debugging on, z==0xBDBDBDBD.

The intended code would be:

z = *y;

----------------------------------------------------

 

Q: What is the 512 bytes allocated from flushwritebuf for?

A: Those 512 bytes are allocated as buffer for the stdout I/O stream.

----------------------------------------------------

 

Q: Why isn't the I/O buffer de-allocated?

A: For performance/code size reasons the I/O buffers are never de-allocated, even at program termination, because there is no behavioural benefit in doing so.

----------------------------------------------------

 

Q: Why doesn't the leaked I/O buffer generate an error?

A: The library checks for and ignores any unfreed I/O buffers, as they do not represent a problem.

----------------------------------------------------

 

Q: What are the "addressable units" mentioned in the report?

A: The addressable units in the report refer to the default memory word size of the architecture. For Blackfin this is 8-bit units, SHARC this is 32-bit units and for  SHARC+ the addressable units are bytes

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