RFR: 8360389: Support printing from C2 compiled code [v3]

[Vladimir Kozlov]

On Wed, 20 Aug 2025 21:24:46 GMT, Benoît Maillard <bmaillard at openjdk.org> wrote:

>> src/hotspot/share/opto/compile.cpp line 5411:
>> 
>>> 5409: }
>>> 5410: 
>>> 5411: Node* Compile::make_debug_print_call(const char* str, address call_addr, PhaseGVN* gvn,
>> 
>> I think it should be in graphKit.cpp similar to `GraphKit::make_runtime_call()`
>
> This was the case in the first iteration of the implementation, but this meant that it could only be used during parsing, and not in subsequent phases. It was actually requested to be moved out of `GraphKit`, and a large chunk of the logic is about doing the wiring of the call node without depending on the `SafePointNode` available in `GraphKit`.
> 
> The three examples in the _More Examples_ section highlight use cases where `GraphKit` is not available. Maybe I should have started with one of these instead of the `return_values` example.

Okay

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/26475#discussion_r2395530119