githubmirror/cpython

Tools/jit/template.c
135 строк4 KB
Mark Shannon
GH-117442: Check eval-breaker at start (rather than end) of tier 2 loops (GH-118482)
02 май 2024, 15:10
02 май 2024, 15:1067bba9d
#include "Python.h"

#include "pycore_backoff.h"
#include "pycore_call.h"
#include "pycore_ceval.h"
#include "pycore_cell.h"
#include "pycore_dict.h"
#include "pycore_emscripten_signal.h"
#include "pycore_intrinsics.h"
#include "pycore_jit.h"
#include "pycore_long.h"
#include "pycore_opcode_metadata.h"
#include "pycore_opcode_utils.h"
#include "pycore_optimizer.h"
#include "pycore_pyatomic_ft_wrappers.h"
#include "pycore_range.h"
#include "pycore_setobject.h"
#include "pycore_sliceobject.h"
#include "pycore_descrobject.h"

#include "ceval_macros.h"

#undef CURRENT_OPARG
#define CURRENT_OPARG() (_oparg)

#undef CURRENT_OPERAND
#define CURRENT_OPERAND() (_operand)

#undef DEOPT_IF
#define DEOPT_IF(COND, INSTNAME) \
    do {                         \
        if ((COND)) {            \
            goto deoptimize;     \
        }                        \
    } while (0)

#undef ENABLE_SPECIALIZATION
#define ENABLE_SPECIALIZATION (0)

#undef GOTO_ERROR
#define GOTO_ERROR(LABEL)        \
    do {                         \
        goto LABEL ## _tier_two; \
    } while (0)

#undef GOTO_TIER_TWO
#define GOTO_TIER_TWO(EXECUTOR) \
do {  \
    OPT_STAT_INC(traces_executed);                \
    __attribute__((musttail))                     \
    return ((jit_func)((EXECUTOR)->jit_side_entry))(frame, stack_pointer, tstate); \
} while (0)

#undef GOTO_TIER_ONE
#define GOTO_TIER_ONE(TARGET) \
do {  \
    _PyFrame_SetStackPointer(frame, stack_pointer); \
    return TARGET; \
} while (0)

#undef LOAD_IP
#define LOAD_IP(UNUSED) \
    do {                \
    } while (0)

#define PATCH_VALUE(TYPE, NAME, ALIAS)  \
    PyAPI_DATA(void) ALIAS;             \
    TYPE NAME = (TYPE)(uintptr_t)&ALIAS;

#define PATCH_JUMP(ALIAS)                                    \
do {                                                         \
    PyAPI_DATA(void) ALIAS;                                  \
    __attribute__((musttail))                                \
    return ((jit_func)&ALIAS)(frame, stack_pointer, tstate); \
} while (0)

#undef JUMP_TO_JUMP_TARGET
#define JUMP_TO_JUMP_TARGET() PATCH_JUMP(_JIT_JUMP_TARGET)

#undef JUMP_TO_ERROR
#define JUMP_TO_ERROR() PATCH_JUMP(_JIT_ERROR_TARGET)

_Py_CODEUNIT *
_JIT_ENTRY(_PyInterpreterFrame *frame, PyObject **stack_pointer, PyThreadState *tstate)
{
    // Locals that the instruction implementations expect to exist:
    PATCH_VALUE(_PyExecutorObject *, current_executor, _JIT_EXECUTOR)
    int oparg;
    int uopcode = _JIT_OPCODE;
    _Py_CODEUNIT *next_instr;
    // Other stuff we need handy:
    PATCH_VALUE(uint16_t, _oparg, _JIT_OPARG)
#if SIZEOF_VOID_P == 8
    PATCH_VALUE(uint64_t, _operand, _JIT_OPERAND)
#else
    assert(SIZEOF_VOID_P == 4);
    PATCH_VALUE(uint32_t, _operand_hi, _JIT_OPERAND_HI)
    PATCH_VALUE(uint32_t, _operand_lo, _JIT_OPERAND_LO)
    uint64_t _operand = ((uint64_t)_operand_hi << 32) | _operand_lo;
#endif
    PATCH_VALUE(uint32_t, _target, _JIT_TARGET)
    PATCH_VALUE(uint16_t, _exit_index, _JIT_EXIT_INDEX)

    OPT_STAT_INC(uops_executed);
    UOP_STAT_INC(uopcode, execution_count);

    // The actual instruction definitions (only one will be used):
    if (uopcode == _JUMP_TO_TOP) {
        PATCH_JUMP(_JIT_TOP);
    }
    switch (uopcode) {
#include "executor_cases.c.h"
        default:
            Py_UNREACHABLE();
    }
    PATCH_JUMP(_JIT_CONTINUE);
    // Labels that the instruction implementations expect to exist:

error_tier_two:
    tstate->previous_executor = (PyObject *)current_executor;
    GOTO_TIER_ONE(NULL);
exit_to_tier1:
    tstate->previous_executor = (PyObject *)current_executor;
    GOTO_TIER_ONE(_PyCode_CODE(_PyFrame_GetCode(frame)) + _target);
exit_to_tier1_dynamic:
    tstate->previous_executor = (PyObject *)current_executor;
    GOTO_TIER_ONE(frame->instr_ptr);
exit_to_trace:
    {
        _PyExitData *exit = &current_executor->exits[_exit_index];
        Py_INCREF(exit->executor);
        tstate->previous_executor = (PyObject *)current_executor;
        GOTO_TIER_TWO(exit->executor);
    }
}