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Instrument C/C++ with -finstrument-functions for execution tracing and Perfetto visualisation
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| name | Function Call Tracing |
| description | Instrument C/C++ with -finstrument-functions for execution tracing and Perfetto visualisation |
| user-invocable | false |
| version | 1 |
| author | Claude |
| tags | ["tracing","profiling","instrumentation","perfetto"] |
Trace all function calls in C/C++ programs with per-thread logs and Perfetto visualization.
Captures function entry/exit, writes per-thread logs.
Build:
gcc -c -fPIC trace_instrument.c -o trace_instrument.o
gcc -shared trace_instrument.o -o libtrace.so -ldl -lpthread
Converts logs to Chrome JSON for Perfetto UI.
Build:
g++ -O3 -std=c++17 trace_to_perfetto.cpp -o trace_to_perfetto
CFLAGS += -finstrument-functions -g
LDFLAGS += -L. -ltrace -ldl -lpthread
make
export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH
./program
# Creates trace_<tid>.log files
./trace_to_perfetto trace_*.log -o trace.json
# Open trace.json in ui.perfetto.dev
[seq] [timestamp] [dots] [ENTRY|EXIT!] function_name
[0] [1.000000000] [ENTRY] main
[1] [1.000050000] . [ENTRY] helper
[2] [1.000100000] . [EXIT!] helper
[3] [1.000150000] [EXIT!] main
trace_instrument.c and trace_to_perfetto.cpp to project-finstrument-functions to CFLAGS-L. -ltrace -ldl -lpthread to LDFLAGSLD_LIBRARY_PATH and run./trace_to_perfetto trace_*.log -o trace.jsonMakefile: Add flags conditionally
ENABLE_TRACE ?= 0
ifeq ($(ENABLE_TRACE),1)
CFLAGS += -finstrument-functions -g
LDFLAGS += -L. -ltrace -ldl -lpthread
endif
CMake: Add option
option(ENABLE_TRACE "Enable tracing" OFF)
if(ENABLE_TRACE)
add_compile_options(-finstrument-functions -g)
link_libraries(trace dl pthread)
endif()
Function ENTRY → "B" (begin) event Function EXIT! → "E" (end) event All threads aligned by timestamp in single file.