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/*-------------------------------------------------------------------------
 * jit.h
 *      Provider independent JIT infrastructure.
 *
 * Copyright (c) 2016-2018, PostgreSQL Global Development Group
 *
 * src/include/jit/jit.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef JIT_H
#define JIT_H

#include "executor/instrument.h"
#include "utils/resowner.h"


/* Flags determining what kind of JIT operations to perform */
#define PGJIT_NONE     0
#define PGJIT_PERFORM  (1 << 0)
#define PGJIT_OPT3     (1 << 1)
#define PGJIT_INLINE   (1 << 2)
#define PGJIT_EXPR       (1 << 3)
#define PGJIT_DEFORM   (1 << 4)


typedef struct JitInstrumentation
{
    /* number of emitted functions */
    size_t        created_functions;

    /* accumulated time to generate code */
    instr_time    generation_counter;

    /* accumulated time for inlining */
    instr_time    inlining_counter;

    /* accumulated time for optimization */
    instr_time    optimization_counter;

    /* accumulated time for code emission */
    instr_time    emission_counter;
} JitInstrumentation;

/*
 * DSM structure for accumulating jit instrumentation of all workers.
 */
typedef struct SharedJitInstrumentation
{
    int            num_workers;
    JitInstrumentation jit_instr[FLEXIBLE_ARRAY_MEMBER];
} SharedJitInstrumentation;

typedef struct JitContext
{
    /* see PGJIT_* above */
    int            flags;

    ResourceOwner resowner;

    JitInstrumentation instr;
} JitContext;

typedef struct JitProviderCallbacks JitProviderCallbacks;

extern void _PG_jit_provider_init(JitProviderCallbacks *cb);
typedef void (*JitProviderInit) (JitProviderCallbacks *cb);
typedef void (*JitProviderResetAfterErrorCB) (void);
typedef void (*JitProviderReleaseContextCB) (JitContext *context);
struct ExprState;
typedef bool (*JitProviderCompileExprCB) (struct ExprState *state);

struct JitProviderCallbacks
{
    JitProviderResetAfterErrorCB reset_after_error;
    JitProviderReleaseContextCB release_context;
    JitProviderCompileExprCB compile_expr;
};


/* GUCs */
extern bool jit_enabled;
extern char *jit_provider;
extern bool jit_debugging_support;
extern bool jit_dump_bitcode;
extern bool jit_expressions;
extern bool jit_profiling_support;
extern bool jit_tuple_deforming;
extern double jit_above_cost;
extern double jit_inline_above_cost;
extern double jit_optimize_above_cost;


extern void jit_reset_after_error(void);
extern void jit_release_context(JitContext *context);

/*
 * Functions for attempting to JIT code. Callers must accept that these might
 * not be able to perform JIT (i.e. return false).
 */
extern bool jit_compile_expr(struct ExprState *state);
extern void InstrJitAgg(JitInstrumentation *dst, JitInstrumentation *add);


#endif                            /* JIT_H */

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