cb0a5c7a36
When using a compilation database (compile_commands.json) in very large projects, significant delays would occur when changing files -- particularly those that happened to be far down the db. Rather than iterating over the whole list every time, we now build up a lookup table based on the tail of the filename (and tail of the directory for widening searches) and iterate over the much smaller list of compile commands for files with the given name. Test metrics (from compile_database_perf/test.sh) show a 90% performance improvement -- from 25 seconds to 2.5 seconds per run.
30 lines
1.3 KiB
Bash
Executable File
30 lines
1.3 KiB
Bash
Executable File
#!/bin/bash
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# Generate source files for ALE to read. They don't have to be very long, the delay is in reading compile_commands, not actually running tests
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mkdir -p gen_src
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for i in {1..400}; do echo "const char *GeneratedFunc${i}() { return \"Word ${i}\"; }" > gen_src/source${i}.cpp; done
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# Create the compile_commands database
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echo "[ {" > compile_commands.json
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for i in {1..399}; do
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{
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echo "\"command\": \"clang++ -c $(pwd)/gen_src/source${i}.cpp -o $(pwd)/build/obj/Debug/source${i}.o -MF $(pwd)/build/obj/Debug/source${i}.d -MMD -MP\","
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echo "\"directory\": \"$(pwd)/build\","
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echo "\"file\": \"$(pwd)/gen_src/source${i}.cpp\""
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echo "}, {"
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} >> compile_commands.json
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done
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{
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echo "\"command\": \"clang++ -c $(pwd)/gen_src/source400.cpp -o $(pwd)/build/obj/Debug/source400.o -MF $(pwd)/build/obj/Debug/source400.d -MMD -MP\","
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echo "\"directory\": \"$(pwd)/build\","
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echo "\"file\": \"$(pwd)/gen_src/source400.cpp\""
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echo "} ]"
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} >> compile_commands.json
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# Start up vim and switch back and forth between files -- at least one of the files must be near the bottom of compile_commands.json
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time vim -c "for i in range(0,20) | edit gen_src/source10.cpp | edit gen_src/source400.cpp | endfor" \
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-c "noautocmd qa!" \
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`find . | grep "source..\.cpp"`
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