c - 给定一个指针，gdb 如何获取它的类型？

Question

gdb 如何知道指针指向 int 或 struct 或任何其他数据类型？

Answer 1

来自:Examining the Symbol Table

whatis expr

Print the data type of expression expr. expr is not actually evaluated, and any side-effecting operations (such as assignments or function calls) inside it do not take place. See section Expressions.

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ptype expr

ptype

Print a description of the type of expression expr. ptype differs from whatis by printing a detailed description, instead of just the name of the type. For example, for this variable declaration:

struct complex {double real; double imag;} v;

这两个命令给出了这个输出:

(gdb) whatis v
 type = struct complex
(gdb) ptype v
 type = struct complex {
    double real;
    double imag;
 }