2020-09-26

04-01:    关于IAR报错：

Tool Internal Error:Internal Error: [assign_colors_C01]: Cannot coalesce physical registers R11

运行环境：cc2540（8051）附加cjson

错误位置（案例）：

/* Parse the input text to generate a number, and populate the result into item. */

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    input_buffer->offset += (size_t)(after_end - test);

    return true;

}

于是笔者做了如下尝试：

将“*test”和“test”容量改为：“unsigned int”，有如下：

素材一

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned int *after_end = NULL;

    unsigned int test[64];

    unsigned char *test2;

    input_buffer->offset += (size_t)(after_end - test);

    return true;

}

编译通过，笔者又做了如下尝试：

素材二

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    unsigned char *test2;

    unsigned char test3;

    unsigned int qw;

    input_buffer->offset += (size_t)(after_end - test2);

    return true;

}

编译通过，笔者又做了如下尝试：

素材三

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    unsigned char *test2;

    unsigned char test3;

    unsigned int qw;

    qw += (size_t)(after_end - test);

    return true;

}

编译通过，笔者又做了如下尝试：

素材四

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    unsigned char *test2;

    unsigned char test3;

    unsigned int qw;

    test3 = input_buffer->offset;

    input_buffer->offset = test3;

    input_buffer->offset += (size_t)(after_end - test);

    return true;

}

编译通过

素材五

    笔者将“test3”定义为“unsigned int”编译器报相同的错误

于是笔者又做了如下尝试：

素材六

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    unsigned char *test2;

    unsigned int test3;

    unsigned int qw;

    input_buffer->offset = input_buffer->offset;

    input_buffer->offset += (size_t)(after_end - test);

    return true;

}

果不其然，编译器报相同的错误，于是笔者又做了如下尝试：

素材七

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    unsigned char *test2;

    unsigned char test3;

    unsigned int qw;

    input_buffer->offset  = 0;

    input_buffer->offset += (size_t)(after_end - test);

    return true;

}

编译通过，笔者又做了如下尝试：

素材八

static cJSON_bool parse_number(cJSON * const item, parse_buffer * const input_buffer)

{

    double number = 0;

    unsigned char *after_end = NULL;

    unsigned char test[64];

    unsigned char *test2;

    unsigned char test3;

    unsigned int qw;

    //input_buffer->offset  = 0;

    input_buffer->offset = (size_t)(after_end - test);

    return true;

}

编译器通过，自此笔者有了进一步分析的素材。

        首先，在此 size_t 为 unsigned int ，容量2字节。

未完待续