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72 lines
2.1 KiB
Plaintext
72 lines
2.1 KiB
Plaintext
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In general, use the same coding style as the surrounding code.
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However, do not make any unnecessary changes as that complicates
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the VCS (git) history and makes it harder to merge patches. So
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do not modify code just to make it conform to a coding style.
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Indentation
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Turn on a "fill tabs with spaces" option in your editor.
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Remove tabs and trailing spaces from any lines that are modified.
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Note that some files are indented with 2 spaces (when they
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have large indentation) while most are indented with 4 spaces.
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Language
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TCC is mostly implemented in C90. Do not use any non-C90 features
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that are not already in use.
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Non-C90 features currently in use, as revealed by
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./configure --extra-cflags="-std=c90 -Wpedantic":
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- long long (including "LL" constants)
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- inline
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- very long string constants
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- assignment between function pointer and 'void *'
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- "//" comments
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- empty macro arguments (DEF_ASMTEST in i386-tok.h)
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- unnamed struct and union fields (in struct Sym), a C11 feature
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Testing
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A simple "make test" is sufficient for some simple changes. However,
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before committing a change consider performing some of the following
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additional tests:
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- Build and run "make test" on several architectures.
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- Build with ./configure --enable-cross.
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- If the generation of relocations has been changed, try compiling
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with TCC and linking with GCC/Clang. If the linker has been
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modified, try compiling with GCC/Clang and linking with TCC.
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- Test with ASan/UBSan to detect memory corruption and undefined behaviour:
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make clean
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./configure
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make
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make test
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cp libtcc.a libtcc.a.hide
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make clean
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./configure --extra-cflags="-fsanitize=address,undefined -g"
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make
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cp libtcc.a.hide libtcc.a
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make test
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- Test with Valgrind to detect some uses of uninitialised values:
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make clean
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./configure
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make
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# On Intel, because Valgrind does floating-point arithmetic differently:
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( cd tests && gcc -I.. tcctest.c && valgrind -q ./a.out > test.ref )
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make test TCC="valgrind -q --leak-check=full `pwd`/tcc -B`pwd` -I`pwd`"
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(Because of how VLAs are implemented, invalid reads are expected
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with 79_vla_continue.)
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