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* '''Automatic source level''': instrumentation added to the source code by an automatic tool according to an instrumentation policy. Example: [[Parasoft]] [[Insure++]]
* '''Intermediate language''': instrumentation added to [[Assembly language|assembly]] or decompiled [[bytecode]]s giving support for multiple higher-level source languages and avoiding (non-symbolic) binary offset re-writing issues, for example [[OpenPAT]].
* '''Compiler assisted''': [[Gprof]], ''Quantify'', ''MicroProfiler'' use this approach. Example: ''gcc -pg ...'' for gprof,
* '''Binary translation''': The tool adds instrumentation to a compiled [[executable]], for example in ATOM.
* '''Runtime instrumentation''': Directly before execution the code is instrumented. The program run is fully supervised and controlled by the tool. Examples: [[Pin (Computer Program)|Pin]], [[Valgrind]], [[DynamoRIO]].
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