diff options
| author | Takashi Kokubun <[email protected]> | 2022-12-10 23:35:30 -0800 |
|---|---|---|
| committer | Takashi Kokubun <[email protected]> | 2023-03-05 22:11:20 -0800 |
| commit | c263ce9c80a2acdd64270cf5d246c19c58947d18 (patch) | |
| tree | d1dc7b0b69d153bbb01c05a6b6e85efc27083e8a /mjit.c | |
| parent | 5d819b9a151711f5af1e9333c6685c18c6a5a431 (diff) | |
Remove more code
Diffstat (limited to 'mjit.c')
| -rw-r--r-- | mjit.c | 69 |
1 files changed, 0 insertions, 69 deletions
@@ -7,64 +7,6 @@ **********************************************************************/ -/* We utilize widely used C compilers (GCC and LLVM Clang) to - implement MJIT. We feed them a C code generated from ISEQ. The - industrial C compilers are slower than regular JIT engines. - Generated code performance of the used C compilers has a higher - priority over the compilation speed. - - So our major goal is to minimize the ISEQ compilation time when we - use widely optimization level (-O2). It is achieved by - - o Using a precompiled version of the header - o Keeping all files in `/tmp`. On modern Linux `/tmp` is a file - system in memory. So it is pretty fast - o Implementing MJIT as a multi-threaded code because we want to - compile ISEQs in parallel with iseq execution to speed up Ruby - code execution. MJIT has one thread (*worker*) to do - parallel compilations: - o It prepares a precompiled code of the minimized header. - It starts at the MRI execution start - o It generates PIC object files of ISEQs - o It takes one JIT unit from a priority queue unless it is empty. - o It translates the JIT unit ISEQ into C-code using the precompiled - header, calls CC and load PIC code when it is ready - o Currently MJIT put ISEQ in the queue when ISEQ is called - o MJIT can reorder ISEQs in the queue if some ISEQ has been called - many times and its compilation did not start yet - o MRI reuses the machine code if it already exists for ISEQ - o The machine code we generate can stop and switch to the ISEQ - interpretation if some condition is not satisfied as the machine - code can be speculative or some exception raises - o Speculative machine code can be canceled. - - Here is a diagram showing the MJIT organization: - - _______ - |header | - |_______| - | MRI building - --------------|---------------------------------------- - | MRI execution - | - _____________|_____ - | | | - | ___V__ | CC ____________________ - | | |----------->| precompiled header | - | | | | |____________________| - | | | | | - | | MJIT | | | - | | | | | - | | | | ____V___ CC __________ - | |______|----------->| C code |--->| .so file | - | | |________| |__________| - | | | - | | | - | MRI machine code |<----------------------------- - |___________________| loading - -*/ - #include "ruby/internal/config.h" // defines USE_MJIT #if USE_MJIT @@ -125,17 +67,6 @@ bool mjit_enabled = false; // and `mjit_call_p == false`, any JIT-ed code execution is cancelled as soon as possible. bool mjit_call_p = false; -// Priority queue of iseqs waiting for JIT compilation. -// This variable is a pointer to head unit of the queue. -static struct rb_mjit_unit_list unit_queue = { CCAN_LIST_HEAD_INIT(unit_queue.head) }; -// List of units which are successfully compiled. -static struct rb_mjit_unit_list active_units = { CCAN_LIST_HEAD_INIT(active_units.head) }; -// List of compacted so files which will be cleaned up by `free_list()` in `mjit_finish()`. -static struct rb_mjit_unit_list compact_units = { CCAN_LIST_HEAD_INIT(compact_units.head) }; -// List of units before recompilation and just waiting for dlclose(). -static struct rb_mjit_unit_list stale_units = { CCAN_LIST_HEAD_INIT(stale_units.head) }; -// The number of so far processed ISEQs, used to generate unique id. - #include "mjit_config.h" // Print the arguments according to FORMAT to stderr only if MJIT |