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/*
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 * Tiny Code Generator for QEMU
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 *
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 * Copyright (c) 2008 Fabrice Bellard
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include "tcg-target.h"
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#if TCG_TARGET_REG_BITS == 32
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typedef int32_t tcg_target_long;
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typedef uint32_t tcg_target_ulong;
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#define TCG_PRIlx PRIx32
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#define TCG_PRIld PRId32
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#elif TCG_TARGET_REG_BITS == 64
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typedef int64_t tcg_target_long;
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typedef uint64_t tcg_target_ulong;
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#define TCG_PRIlx PRIx64
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#define TCG_PRIld PRId64
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#else
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#error unsupported
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#endif
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#if TCG_TARGET_NB_REGS <= 32
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typedef uint32_t TCGRegSet;
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#elif TCG_TARGET_NB_REGS <= 64
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typedef uint64_t TCGRegSet;
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#else
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#error unsupported
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#endif
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enum {
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#define DEF(s, n, copy_size) INDEX_op_ ## s,
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#include "tcg-opc.h"
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#undef DEF
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    NB_OPS,
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};
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#define tcg_regset_clear(d) (d) = 0
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#define tcg_regset_set(d, s) (d) = (s)
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#define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg)
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#define tcg_regset_set_reg(d, r) (d) |= 1 << (r)
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#define tcg_regset_reset_reg(d, r) (d) &= ~(1 << (r))
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#define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)
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#define tcg_regset_or(d, a, b) (d) = (a) | (b)
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#define tcg_regset_and(d, a, b) (d) = (a) & (b)
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#define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b)
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#define tcg_regset_not(d, a) (d) = ~(a)
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typedef struct TCGRelocation {
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    struct TCGRelocation *next;
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    int type;
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    uint8_t *ptr;
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    tcg_target_long addend;
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} TCGRelocation; 
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typedef struct TCGLabel {
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    int has_value;
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    union {
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        tcg_target_ulong value;
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        TCGRelocation *first_reloc;
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    } u;
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} TCGLabel;
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typedef struct TCGPool {
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    struct TCGPool *next;
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    int size;
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    uint8_t data[0] __attribute__ ((aligned));
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} TCGPool;
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#define TCG_POOL_CHUNK_SIZE 32768
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#define TCG_MAX_LABELS 512
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#define TCG_MAX_TEMPS 512
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/* when the size of the arguments of a called function is smaller than
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   this value, they are statically allocated in the TB stack frame */
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#define TCG_STATIC_CALL_ARGS_SIZE 128
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typedef int TCGType;
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#define TCG_TYPE_I32 0
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#define TCG_TYPE_I64 1
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#if TCG_TARGET_REG_BITS == 32
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#define TCG_TYPE_PTR TCG_TYPE_I32
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#else
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#define TCG_TYPE_PTR TCG_TYPE_I64
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#endif
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typedef tcg_target_ulong TCGArg;
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/* Define a type and accessor macros for varables.  Using a struct is
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   nice because it gives some level of type safely.  Ideally the compiler
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   be able to see through all this.  However in practice this is not true,
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   expecially on targets with braindamaged ABIs (e.g. i386).
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   We use plain int by default to avoid this runtime overhead.
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   Users of tcg_gen_* don't need to know about any of this, and should
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   treat TCGv as an opaque type.  */
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//#define DEBUG_TCGV 1
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#ifdef DEBUG_TCGV
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typedef struct
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{
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    int n;
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} TCGv;
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#define MAKE_TCGV(i) __extension__ \
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  ({ TCGv make_tcgv_tmp = {i}; make_tcgv_tmp;})
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#define GET_TCGV(t) ((t).n)
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#if TCG_TARGET_REG_BITS == 32
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#define TCGV_HIGH(t) MAKE_TCGV(GET_TCGV(t) + 1)
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#endif
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#else /* !DEBUG_TCGV */
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typedef int TCGv;
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#define MAKE_TCGV(x) (x)
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#define GET_TCGV(t) (t)
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#if TCG_TARGET_REG_BITS == 32
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#define TCGV_HIGH(t) ((t) + 1)
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#endif
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#endif /* DEBUG_TCGV */
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/* call flags */
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#define TCG_CALL_TYPE_MASK      0x000f
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#define TCG_CALL_TYPE_STD       0x0000 /* standard C call */
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#define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */
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#define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */
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#define TCG_CALL_TYPE_REGPARM   0x0003 /* i386 style regparm call (3 regs) */
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/* A pure function only reads its arguments and globals variables and
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   cannot raise exceptions. Hence a call to a pure function can be
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   safely suppressed if the return value is not used. */
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#define TCG_CALL_PURE           0x0010 
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/* used to align parameters */
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#define TCG_CALL_DUMMY_TCGV     MAKE_TCGV(-1)
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#define TCG_CALL_DUMMY_ARG      ((TCGArg)(-1))
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typedef enum {
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    TCG_COND_EQ,
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    TCG_COND_NE,
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    TCG_COND_LT,
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    TCG_COND_GE,
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    TCG_COND_LE,
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    TCG_COND_GT,
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    /* unsigned */
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    TCG_COND_LTU,
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    TCG_COND_GEU,
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    TCG_COND_LEU,
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    TCG_COND_GTU,
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} TCGCond;
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#define TEMP_VAL_DEAD  0
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#define TEMP_VAL_REG   1
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#define TEMP_VAL_MEM   2
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#define TEMP_VAL_CONST 3
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/* XXX: optimize memory layout */
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typedef struct TCGTemp {
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    TCGType base_type;
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    TCGType type;
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    int val_type;
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    int reg;
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    tcg_target_long val;
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    int mem_reg;
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    tcg_target_long mem_offset;
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    unsigned int fixed_reg:1;
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    unsigned int mem_coherent:1;
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    unsigned int mem_allocated:1;
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    const char *name;
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} TCGTemp;
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typedef struct TCGHelperInfo {
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    tcg_target_ulong func;
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    const char *name;
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} TCGHelperInfo;
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typedef struct TCGContext TCGContext;
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typedef void TCGMacroFunc(TCGContext *s, int macro_id, const int *dead_args);
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struct TCGContext {
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    uint8_t *pool_cur, *pool_end;
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    TCGPool *pool_first, *pool_current;
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    TCGLabel *labels;
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    int nb_labels;
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    TCGTemp *temps; /* globals first, temps after */
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    int nb_globals;
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    int nb_temps;
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    /* constant indexes (end of temp array) */
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    int const_start;
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    int const_end;
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    /* goto_tb support */
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    uint8_t *code_buf;
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    unsigned long *tb_next;
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    uint16_t *tb_next_offset;
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    uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */
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    uint16_t *op_dead_iargs; /* for each operation, each bit tells if the
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                                corresponding input argument is dead */
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    /* tells in which temporary a given register is. It does not take
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       into account fixed registers */
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    int reg_to_temp[TCG_TARGET_NB_REGS];
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    TCGRegSet reserved_regs;
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    tcg_target_long current_frame_offset;
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    tcg_target_long frame_start;
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    tcg_target_long frame_end;
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    int frame_reg;
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    uint8_t *code_ptr;
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    TCGTemp static_temps[TCG_MAX_TEMPS];
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    TCGMacroFunc *macro_func;
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    TCGHelperInfo *helpers;
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    int nb_helpers;
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    int allocated_helpers;
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#ifdef CONFIG_PROFILER
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    /* profiling info */
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    int64_t tb_count1;
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    int64_t tb_count;
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    int64_t op_count; /* total insn count */
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    int op_count_max; /* max insn per TB */
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    int64_t temp_count;
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    int temp_count_max;
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    int64_t old_op_count;
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    int64_t del_op_count;
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    int64_t code_in_len;
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    int64_t code_out_len;
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    int64_t interm_time;
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    int64_t code_time;
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    int64_t la_time;
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    int64_t restore_count;
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    int64_t restore_time;
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#endif
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};
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extern TCGContext tcg_ctx;
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extern uint16_t *gen_opc_ptr;
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extern TCGArg *gen_opparam_ptr;
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extern uint16_t gen_opc_buf[];
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extern TCGArg gen_opparam_buf[];
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/* pool based memory allocation */
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void *tcg_malloc_internal(TCGContext *s, int size);
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void tcg_pool_reset(TCGContext *s);
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void tcg_pool_delete(TCGContext *s);
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static inline void *tcg_malloc(int size)
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{
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    TCGContext *s = &tcg_ctx;
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    uint8_t *ptr, *ptr_end;
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    size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);
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    ptr = s->pool_cur;
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    ptr_end = ptr + size;
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    if (unlikely(ptr_end > s->pool_end)) {
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        return tcg_malloc_internal(&tcg_ctx, size);
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    } else {
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        s->pool_cur = ptr_end;
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        return ptr;
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    }
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}
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void tcg_context_init(TCGContext *s);
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void tcg_func_start(TCGContext *s);
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int dyngen_code(TCGContext *s, uint8_t *gen_code_buf);
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int dyngen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset);
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void tcg_set_frame(TCGContext *s, int reg,
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                   tcg_target_long start, tcg_target_long size);
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void tcg_set_macro_func(TCGContext *s, TCGMacroFunc *func);
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TCGv tcg_global_reg_new(TCGType type, int reg, const char *name);
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TCGv tcg_global_reg2_new_hack(TCGType type, int reg1, int reg2, 
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                              const char *name);
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TCGv tcg_global_mem_new(TCGType type, int reg, tcg_target_long offset,
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                        const char *name);
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TCGv tcg_temp_new(TCGType type);
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char *tcg_get_arg_str(TCGContext *s, char *buf, int buf_size, TCGv arg);
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void tcg_dump_info(FILE *f,
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                   int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
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#define TCG_CT_ALIAS  0x80
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#define TCG_CT_IALIAS 0x40
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#define TCG_CT_REG    0x01
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#define TCG_CT_CONST  0x02 /* any constant of register size */
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typedef struct TCGArgConstraint {
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    uint16_t ct;
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    uint8_t alias_index;
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    union {
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        TCGRegSet regs;
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    } u;
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} TCGArgConstraint;
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#define TCG_MAX_OP_ARGS 16
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#define TCG_OPF_BB_END     0x01 /* instruction defines the end of a basic
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                                   block */
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#define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers 
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                                   and potentially update globals. */
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#define TCG_OPF_SIDE_EFFECTS 0x04 /* instruction has side effects : it
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                                     cannot be removed if its output
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                                     are not used */
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typedef struct TCGOpDef {
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    const char *name;
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    uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
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    uint8_t flags;
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    uint16_t copy_size;
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    TCGArgConstraint *args_ct;
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    int *sorted_args;
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} TCGOpDef;
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typedef struct TCGTargetOpDef {
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    int op;
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    const char *args_ct_str[TCG_MAX_OP_ARGS];
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} TCGTargetOpDef;
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extern TCGOpDef tcg_op_defs[];
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void tcg_target_init(TCGContext *s);
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void tcg_target_qemu_prologue(TCGContext *s);
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#define tcg_abort() \
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do {\
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    fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\
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    abort();\
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} while (0)
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void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
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void tcg_gen_call(TCGContext *s, TCGv func, unsigned int flags,
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                  unsigned int nb_rets, const TCGv *rets,
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                  unsigned int nb_params, const TCGv *args1);
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void tcg_gen_shifti_i64(TCGv ret, TCGv arg1, 
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                        int c, int right, int arith);
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/* only used for debugging purposes */
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void tcg_register_helper(void *func, const char *name);
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#define TCG_HELPER(func) tcg_register_helper(func, #func)
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const char *tcg_helper_get_name(TCGContext *s, void *func);
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void tcg_dump_ops(TCGContext *s, FILE *outfile);
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void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf);
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TCGv tcg_const_i32(int32_t val);
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TCGv tcg_const_i64(int64_t val);
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#if TCG_TARGET_REG_BITS == 32
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#define tcg_const_ptr tcg_const_i32
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#define tcg_add_ptr tcg_add_i32
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#define tcg_sub_ptr tcg_sub_i32
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#else
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#define tcg_const_ptr tcg_const_i64
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#define tcg_add_ptr tcg_add_i64
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#define tcg_sub_ptr tcg_sub_i64
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#endif
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void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type, 
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                   int label_index, long addend);
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void tcg_reg_alloc_start(TCGContext *s);
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void tcg_reg_alloc_bb_end(TCGContext *s);
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void tcg_liveness_analysis(TCGContext *s);
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const TCGArg *tcg_gen_code_op(TCGContext *s, int opc, const TCGArg *args1,
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                              unsigned int dead_iargs);
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const TCGArg *dyngen_op(TCGContext *s, int opc, const TCGArg *opparam_ptr);
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/* tcg-runtime.c */
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int64_t tcg_helper_shl_i64(int64_t arg1, int64_t arg2);
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int64_t tcg_helper_shr_i64(int64_t arg1, int64_t arg2);
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int64_t tcg_helper_sar_i64(int64_t arg1, int64_t arg2);
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int64_t tcg_helper_div_i64(int64_t arg1, int64_t arg2);
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int64_t tcg_helper_rem_i64(int64_t arg1, int64_t arg2);
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uint64_t tcg_helper_divu_i64(uint64_t arg1, uint64_t arg2);
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uint64_t tcg_helper_remu_i64(uint64_t arg1, uint64_t arg2);
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extern uint8_t code_gen_prologue[];
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#define tcg_qemu_tb_exec(tb_ptr) ((long REGPARM (*)(void *))code_gen_prologue)(tb_ptr)