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GNU Compiler Collection (GCC) Internals

7.6.2 Function Bodies

A function that has a definition in the current translation unit will have a non-NULL DECL_INITIAL. However, back ends should not make use of the particular value given by DECL_INITIAL.

The DECL_SAVED_TREE macro will give the complete body of the function. This node will usually be a COMPOUND_STMT representing the outermost block of the function, but it may also be a TRY_BLOCK, a RETURN_INIT, or any other valid statement.