27 lines
1.2 KiB
Markdown
27 lines
1.2 KiB
Markdown
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GCC/gcov code coverage data extraction from the actual embedded system, without requiring a file system, or an operating system, or standard C libraries.
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See the PDF slide file in the repo for an overview, and see the github wiki for more information about customization options for your embedded system. Also see the simple Linux-compilable example in the repo.
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Embedded gcov: Insert in your code
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```
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#include "gcov_public.h"
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…
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// want this as early as possible,
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// but cannot call this until after
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// the trap table and system stuff are set up
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// may not be needed in all systems, depending on startup code
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__gcov_call_constructors();
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…
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case 9: // a command in my system
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__gcov_exit(); // dumps the data
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break;
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…
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```
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Add the embedded gcov source files gcov\_public.c and gcov\_gcc.c to your build.
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You likely want a separate gcov build target, with preprocessor flags.
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May need a separate linker file for gnu ld, defining symbols for \_\_gcov\_call\_constructors().
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Then compile with gcc and usual coverage flags -ftest-coverage -fprofile-arcs
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