2011-9-17 13:39:38-优快云博客

本文介绍了一种用于管理全局寄存器的静态内联函数tcg_global_reg_new_internal，该函数允许创建并初始化全局寄存器，并详细展示了其内部实现流程。此外，文章还提供了TCGTemp结构体的定义及全局寄存器初始化的例子。

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2011-9-17 13:39:38

static inline int tcg_global_reg_new_internal(TCGType type, int reg,
                                              const char *name)
{
    TCGContext *s = &tcg_ctx;
    TCGTemp *ts;
    int idx;

#if TCG_TARGET_REG_BITS == 32
    if (type != TCG_TYPE_I32)
        tcg_abort();
#endif
    if (tcg_regset_test_reg(s->reserved_regs, reg))
        tcg_abort();
    idx = s->nb_globals;
    tcg_temp_alloc(s, s->nb_globals + 1);
    ts = &s->temps[s->nb_globals];
    ts->base_type = type;
    ts->type = type;
    ts->fixed_reg = 1;
    ts->reg = reg;
    ts->name = name;
    s->nb_globals++;
    tcg_regset_set_reg(s->reserved_regs, reg);
    return idx;
}

全局寄存器只有一份！！！

/* XXX: optimize memory layout */
typedef struct TCGTemp {
    TCGType base_type;
    TCGType type;
    int val_type;
    int reg;
    tcg_target_long val;
    int mem_reg;
    tcg_target_long mem_offset;
    unsigned int fixed_reg:1;
    unsigned int mem_coherent:1;
    unsigned int mem_allocated:1;
    unsigned int temp_local:1; /* If true, the temp is saved accross
                                  basic blocks. Otherwise, it is not
                                  preserved accross basic blocks. */
    unsigned int temp_allocated:1; /* never used for code gen */
    /* index of next free temp of same base type, -1 if end */
    int next_free_temp;
    const char *name;
} TCGTemp;