Weaver is a useful debugging tool. The goal of weaver is to have strace-like functionality except for tracing functions in go programs.
Input:
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A functions file (using
-f/--functions-file) - A line delimited file containing specifications for function names and their argument types. -
A compiled go program - The actual binary which contains the functions specified in the functions file.
Behavior:
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Weaver reads the specified functions file. Each line is parsed into an internal data structure (trace context) which represents the arguments.
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The stack offsets are then calculated based on this logic and recorded in the same trace context structure.
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The trace context for each function is compiled into eBPF programs using a text template.
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Each eBPF program is loaded into the kernel attached to their corresponding uprobes.
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Weaver listens on a single perf buffer for argument values from the eBPF programs once their triggered by running the corresponding program.
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Arguments are outputted in the configured manner.