我是解析新手，我尝试使用Pycparser解析我的c文件，并且按照说明通过预处理文件gcc -E进行操作，然后使用了example文件夹中的using_gcc_E_libc.py并传递了文件，我得到了一些输出，但不确定这是否是AST的样子？ 如果那是正确的AST，我如何找到每个节点及其依赖关系以及该节点的指针（位置）？
FileAST:
Typedef: size_t, [], ['typedef']
TypeDecl: size_t, []
IdentifierType: ['int']
Typedef: __builtin_va_list, [], ['typedef']
TypeDecl: __builtin_va_list, []
IdentifierType: ['int']
Typedef: __gnuc_va_list, [], ['typedef']
TypeDecl: __gnuc_va_list, []
IdentifierType: ['int']
Typedef: va_list, [], ['typedef']
TypeDecl: va_list, []
IdentifierType: ['int']
Typedef: __int8_t, [], ['typedef']
TypeDecl: __int8_t, []
IdentifierType: ['int']
Typedef: __uint8_t, [], ['typedef']
TypeDecl: __uint8_t, []
IdentifierType: ['int']
Typedef: __int16_t, [], ['typedef']
TypeDecl: __int16_t, []
IdentifierType: ['int']
Typedef: __uint16_t, [], ['typedef']
TypeDecl: __uint16_t, []
IdentifierType: ['int']
Typedef: __int_least16_t, [], ['typedef']
TypeDecl: __int_least16_t, []
IdentifierType: ['int']
Typedef: __uint_least16_t, [], ['typedef']
TypeDecl: __uint_least16_t, []
IdentifierType: ['int']
Typedef: __int32_t, [], ['typedef']
TypeDecl: __int32_t, []
IdentifierType: ['int']
Typedef: __uint32_t, [], ['typedef']
TypeDecl: __uint32_t, []
IdentifierType: ['int']
Typedef: __int64_t, [], ['typedef']
TypeDecl: __int64_t, []
IdentifierType: ['int']
Typedef: __uint64_t, [], ['typedef']
TypeDecl: __uint64_t, []
IdentifierType: ['int']
Typedef: __int_least32_t, [], ['typedef']
TypeDecl: __int_least32_t, []
IdentifierType: ['int']
Typedef: __uint_least32_t, [], ['typedef']
TypeDecl: __uint_least32_t, []
IdentifierType: ['int']
Typedef: __s8, [], ['typedef']
TypeDecl: __s8, []
IdentifierType: ['int']
Typedef: __u8, [], ['typedef']
TypeDecl: __u8, []
IdentifierType: ['int']
Typedef: __s16, [], ['typedef']
TypeDecl: __s16, []
IdentifierType: ['int']
Typedef: __u16, [], ['typedef']
TypeDecl: __u16, []
IdentifierType: ['int']
Typedef: __s32, [], ['typedef']
TypeDecl: __s32, []
IdentifierType: ['int']
Typedef: __u32, [], ['typedef']
TypeDecl: __u32, []
IdentifierType: ['int']
Typedef: __s64, [], ['typedef']
TypeDecl: __s64, []
IdentifierType: ['int']
Typedef: __u64, [], ['typedef']
TypeDecl: __u64, []
IdentifierType: ['int']
Typedef: _LOCK_T, [], ['typedef']
TypeDecl: _LOCK_T, []
IdentifierType: ['int']
Typedef: _LOCK_RECURSIVE_T, [], ['typedef']
TypeDecl: _LOCK_RECURSIVE_T, []
IdentifierType: ['int']
Typedef: _off_t, [], ['typedef']
TypeDecl: _off_t, []
IdentifierType: ['int']
Typedef: __dev_t, [], ['typedef']
TypeDecl: __dev_t, []
IdentifierType: ['int']
Typedef: __uid_t, [], ['typedef']
TypeDecl: __uid_t, []
IdentifierType: ['int']
Typedef: __gid_t, [], ['typedef']
TypeDecl: __gid_t, []
IdentifierType: ['int']
Typedef: _off64_t, [], ['typedef']
TypeDecl: _off64_t, []
IdentifierType: ['int']
Typedef: _fpos_t, [], ['typedef']
TypeDecl: _fpos_t, []
IdentifierType: ['int']
Typedef: _ssize_t, [], ['typedef']
TypeDecl: _ssize_t, []
IdentifierType: ['int']
Typedef: wint_t, [], ['typedef']
TypeDecl: wint_t, []
IdentifierType: ['int']
Typedef: _mbstate_t, [], ['typedef']
TypeDecl: _mbstate_t, []
IdentifierType: ['int']
Typedef: _flock_t, [], ['typedef']
TypeDecl: _flock_t, []
IdentifierType: ['int']
Typedef: _iconv_t, [], ['typedef']
TypeDecl: _iconv_t, []
IdentifierType: ['int']
Typedef: __ULong, [], ['typedef']
TypeDecl: __ULong, []
IdentifierType: ['int']
Typedef: __FILE, [], ['typedef']
TypeDecl: __FILE, []
IdentifierType: ['int']
Typedef: ptrdiff_t, [], ['typedef']
TypeDecl: ptrdiff_t, []
IdentifierType: ['int']
Typedef: wchar_t, [], ['typedef']
TypeDecl: wchar_t, []
IdentifierType: ['int']
Typedef: __off_t, [], ['typedef']
TypeDecl: __off_t, []
IdentifierType: ['int']
Typedef: __pid_t, [], ['typedef']
TypeDecl: __pid_t, []
IdentifierType: ['int']
Typedef: __loff_t, [], ['typedef']
TypeDecl: __loff_t, []
IdentifierType: ['int']
Typedef: u_char, [], ['typedef']
TypeDecl: u_char, []
IdentifierType: ['int']
Typedef: u_short, [], ['typedef']
TypeDecl: u_short, []
IdentifierType: ['int']
Typedef: u_int, [], ['typedef']
TypeDecl: u_int, []
IdentifierType: ['int']
Typedef: u_long, [], ['typedef']
TypeDecl: u_long, []
IdentifierType: ['int']
Typedef: ushort, [], ['typedef']
TypeDecl: ushort, []
IdentifierType: ['int']
Typedef: uint, [], ['typedef']
TypeDecl: uint, []
IdentifierType: ['int']
Typedef: clock_t, [], ['typedef']
TypeDecl: clock_t, []
IdentifierType: ['int']
Typedef: time_t, [], ['typedef']
TypeDecl: time_t, []
IdentifierType: ['int']
Typedef: daddr_t, [], ['typedef']
TypeDecl: daddr_t, []
IdentifierType: ['int']
Typedef: caddr_t, [], ['typedef']
TypeDecl: caddr_t, []
IdentifierType: ['int']
Typedef: ino_t, [], ['typedef']
TypeDecl: ino_t, []
IdentifierType: ['int']
Typedef: off_t, [], ['typedef']
TypeDecl: off_t, []
IdentifierType: ['int']
Typedef: dev_t, [], ['typedef']
TypeDecl: dev_t, []
IdentifierType: ['int']
Typedef: uid_t, [], ['typedef']
TypeDecl: uid_t, []
IdentifierType: ['int']
Typedef: gid_t, [], ['typedef']
TypeDecl: gid_t, []
IdentifierType: ['int']
Typedef: pid_t, [], ['typedef']
TypeDecl: pid_t, []
IdentifierType: ['int']
Typedef: key_t, [], ['typedef']
TypeDecl: key_t, []
IdentifierType: ['int']
Typedef: ssize_t, [], ['typedef']
TypeDecl: ssize_t, []
IdentifierType: ['int']
Typedef: mode_t, [], ['typedef']
TypeDecl: mode_t, []
IdentifierType: ['int']
Typedef: nlink_t, [], ['typedef']
TypeDecl: nlink_t, []
IdentifierType: ['int']
Typedef: fd_mask, [], ['typedef']
TypeDecl: fd_mask, []
IdentifierType: ['int']
Typedef: _types_fd_set, [], ['typedef']
TypeDecl: _types_fd_set, []
IdentifierType: ['int']
Typedef: clockid_t, [], ['typedef']
TypeDecl: clockid_t, []
IdentifierType: ['int']
Typedef: timer_t, [], ['typedef']
TypeDecl: timer_t, []
IdentifierType: ['int']
Typedef: useconds_t, [], ['typedef']
TypeDecl: useconds_t, []
IdentifierType: ['int']
Typedef: suseconds_t, [], ['typedef']
TypeDecl: suseconds_t, []
IdentifierType: ['int']
Typedef: FILE, [], ['typedef']
TypeDecl: FILE, []
IdentifierType: ['int']
Typedef: fpos_t, [], ['typedef']
TypeDecl: fpos_t, []
IdentifierType: ['int']
Typedef: cookie_read_function_t, [], ['typedef']
TypeDecl: cookie_read_function_t, []
IdentifierType: ['int']
Typedef: cookie_write_function_t, [], ['typedef']
TypeDecl: cookie_write_function_t, []
IdentifierType: ['int']
Typedef: cookie_seek_function_t, [], ['typedef']
TypeDecl: cookie_seek_function_t, []
IdentifierType: ['int']
Typedef: cookie_close_function_t, [], ['typedef']
TypeDecl: cookie_close_function_t, []
IdentifierType: ['int']
Typedef: cookie_io_functions_t, [], ['typedef']
TypeDecl: cookie_io_functions_t, []
IdentifierType: ['int']
Typedef: div_t, [], ['typedef']
TypeDecl: div_t, []
IdentifierType: ['int']
Typedef: ldiv_t, [], ['typedef']
TypeDecl: ldiv_t, []
IdentifierType: ['int']
Typedef: lldiv_t, [], ['typedef']
TypeDecl: lldiv_t, []
IdentifierType: ['int']
Typedef: sigset_t, [], ['typedef']
TypeDecl: sigset_t, []
IdentifierType: ['int']
Typedef: __sigset_t, [], ['typedef']
TypeDecl: __sigset_t, []
IdentifierType: ['int']
Typedef: _sig_func_ptr, [], ['typedef']
TypeDecl: _sig_func_ptr, []
IdentifierType: ['int']
Typedef: sig_atomic_t, [], ['typedef']
TypeDecl: sig_atomic_t, []
IdentifierType: ['int']
Typedef: __tzrule_type, [], ['typedef']
TypeDecl: __tzrule_type, []
IdentifierType: ['int']
Typedef: __tzinfo_type, [], ['typedef']
TypeDecl: __tzinfo_type, []
IdentifierType: ['int']
Typedef: mbstate_t, [], ['typedef']
TypeDecl: mbstate_t, []
IdentifierType: ['int']
Typedef: sem_t, [], ['typedef']
TypeDecl: sem_t, []
IdentifierType: ['int']
Typedef: pthread_t, [], ['typedef']
TypeDecl: pthread_t, []
IdentifierType: ['int']
Typedef: pthread_attr_t, [], ['typedef']
TypeDecl: pthread_attr_t, []
IdentifierType: ['int']
Typedef: pthread_mutex_t, [], ['typedef']
TypeDecl: pthread_mutex_t, []
IdentifierType: ['int']
Typedef: pthread_mutexattr_t, [], ['typedef']
TypeDecl: pthread_mutexattr_t, []
IdentifierType: ['int']
Typedef: pthread_cond_t, [], ['typedef']
TypeDecl: pthread_cond_t, []
IdentifierType: ['int']
Typedef: pthread_condattr_t, [], ['typedef']
TypeDecl: pthread_condattr_t, []
IdentifierType: ['int']
Typedef: pthread_key_t, [], ['typedef']
TypeDecl: pthread_key_t, []
IdentifierType: ['int']
Typedef: pthread_once_t, [], ['typedef']
TypeDecl: pthread_once_t, []
IdentifierType: ['int']
Typedef: pthread_rwlock_t, [], ['typedef']
TypeDecl: pthread_rwlock_t, []
IdentifierType: ['int']
Typedef: pthread_rwlockattr_t, [], ['typedef']
TypeDecl: pthread_rwlockattr_t, []
IdentifierType: ['int']
Typedef: pthread_spinlock_t, [], ['typedef']
TypeDecl: pthread_spinlock_t, []
IdentifierType: ['int']
Typedef: pthread_barrier_t, [], ['typedef']
TypeDecl: pthread_barrier_t, []
IdentifierType: ['int']
Typedef: pthread_barrierattr_t, [], ['typedef']
TypeDecl: pthread_barrierattr_t, []
IdentifierType: ['int']
Typedef: jmp_buf, [], ['typedef']
TypeDecl: jmp_buf, []
IdentifierType: ['int']
Typedef: rlim_t, [], ['typedef']
TypeDecl: rlim_t, []
IdentifierType: ['int']
Typedef: sa_family_t, [], ['typedef']
TypeDecl: sa_family_t, []
IdentifierType: ['int']
Typedef: sigjmp_buf, [], ['typedef']
TypeDecl: sigjmp_buf, []
IdentifierType: ['int']
Typedef: stack_t, [], ['typedef']
TypeDecl: stack_t, []
IdentifierType: ['int']
Typedef: siginfo_t, [], ['typedef']
TypeDecl: siginfo_t, []
IdentifierType: ['int']
Typedef: z_stream, [], ['typedef']
TypeDecl: z_stream, []
IdentifierType: ['int']
Typedef: int8_t, [], ['typedef']
TypeDecl: int8_t, []
IdentifierType: ['int']
Typedef: uint8_t, [], ['typedef']
TypeDecl: uint8_t, []
IdentifierType: ['int']
Typedef: int16_t, [], ['typedef']
TypeDecl: int16_t, []
IdentifierType: ['int']
Typedef: uint16_t, [], ['typedef']
TypeDecl: uint16_t, []
IdentifierType: ['int']
Typedef: int32_t, [], ['typedef']
TypeDecl: int32_t, []
IdentifierType: ['int']
Typedef: uint32_t, [], ['typedef']
TypeDecl: uint32_t, []
IdentifierType: ['int']
Typedef: int64_t, [], ['typedef']
TypeDecl: int64_t, []
IdentifierType: ['int']
Typedef: uint64_t, [], ['typedef']
TypeDecl: uint64_t, []
IdentifierType: ['int']
Typedef: int_least8_t, [], ['typedef']
TypeDecl: int_least8_t, []
IdentifierType: ['int']
Typedef: uint_least8_t, [], ['typedef']
TypeDecl: uint_least8_t, []
IdentifierType: ['int']
Typedef: int_least16_t, [], ['typedef']
TypeDecl: int_least16_t, []
IdentifierType: ['int']
Typedef: uint_least16_t, [], ['typedef']
TypeDecl: uint_least16_t, []
IdentifierType: ['int']
Typedef: int_least32_t, [], ['typedef']
TypeDecl: int_least32_t, []
IdentifierType: ['int']
Typedef: uint_least32_t, [], ['typedef']
TypeDecl: uint_least32_t, []
IdentifierType: ['int']
Typedef: int_least64_t, [], ['typedef']
TypeDecl: int_least64_t, []
IdentifierType: ['int']
Typedef: uint_least64_t, [], ['typedef']
TypeDecl: uint_least64_t, []
IdentifierType: ['int']
Typedef: int_fast8_t, [], ['typedef']
TypeDecl: int_fast8_t, []
IdentifierType: ['int']
Typedef: uint_fast8_t, [], ['typedef']
TypeDecl: uint_fast8_t, []
IdentifierType: ['int']
Typedef: int_fast16_t, [], ['typedef']
TypeDecl: int_fast16_t, []
IdentifierType: ['int']
Typedef: uint_fast16_t, [], ['typedef']
TypeDecl: uint_fast16_t, []
IdentifierType: ['int']
Typedef: int_fast32_t, [], ['typedef']
TypeDecl: int_fast32_t, []
IdentifierType: ['int']
Typedef: uint_fast32_t, [], ['typedef']
TypeDecl: uint_fast32_t, []
IdentifierType: ['int']
Typedef: int_fast64_t, [], ['typedef']
TypeDecl: int_fast64_t, []
IdentifierType: ['int']
Typedef: uint_fast64_t, [], ['typedef']
TypeDecl: uint_fast64_t, []
IdentifierType: ['int']
Typedef: intptr_t, [], ['typedef']
TypeDecl: intptr_t, []
IdentifierType: ['int']
Typedef: uintptr_t, [], ['typedef']
TypeDecl: uintptr_t, []
IdentifierType: ['int']
Typedef: intmax_t, [], ['typedef']
TypeDecl: intmax_t, []
IdentifierType: ['int']
Typedef: uintmax_t, [], ['typedef']
TypeDecl: uintmax_t, []
IdentifierType: ['int']
Typedef: bool, [], ['typedef']
TypeDecl: bool, []
IdentifierType: ['_Bool']
Typedef: MirEGLNativeWindowType, [], ['typedef']
PtrDecl: []
TypeDecl: MirEGLNativeWindowType, []
IdentifierType: ['void']
Typedef: MirEGLNativeDisplayType, [], ['typedef']
PtrDecl: []
TypeDecl: MirEGLNativeDisplayType, []
IdentifierType: ['void']
Typedef: MirConnection, [], ['typedef']
TypeDecl: MirConnection, []
Struct: MirConnection
Typedef: MirSurface, [], ['typedef']
TypeDecl: MirSurface, []
Struct: MirSurface
Typedef: MirSurfaceSpec, [], ['typedef']
TypeDecl: MirSurfaceSpec, []
Struct: MirSurfaceSpec
Typedef: MirScreencast, [], ['typedef']
TypeDecl: MirScreencast, []
Struct: MirScreencast
Typedef: MirPromptSession, [], ['typedef']
TypeDecl: MirPromptSession, []
Struct: MirPromptSession
Typedef: MirBufferStream, [], ['typedef']
TypeDecl: MirBufferStream, []
Struct: MirBufferStream
Typedef: MirPersistentId, [], ['typedef']
TypeDecl: MirPersistentId, []
Struct: MirPersistentId
Typedef: MirBlob, [], ['typedef']
TypeDecl: MirBlob, []
Struct: MirBlob
Typedef: MirDisplayConfig, [], ['typedef']
TypeDecl: MirDisplayConfig, []
Struct: MirDisplayConfig
Typedef: xcb_connection_t, [], ['typedef']
TypeDecl: xcb_connection_t, []
Struct: xcb_connection_t
Typedef: xcb_window_t, [], ['typedef']
TypeDecl: xcb_window_t, []
IdentifierType: ['uint32_t']
Typedef: xcb_visualid_t, [], ['typedef']
TypeDecl: xcb_visualid_t, []
IdentifierType: ['uint32_t']
FuncDef:
Decl: main, [], [], []
FuncDecl:
TypeDecl: main, []
IdentifierType: ['int']
Compound:
Decl: number1, [], [], []
TypeDecl: number1, []
IdentifierType: ['int']
Decl: number2, [], [], []
TypeDecl: number2, []
IdentifierType: ['int']
FuncCall:
ID: printf
ExprList:
Constant: string, "Enter two integers: "
FuncCall:
ID: scanf
ExprList:
Constant: string, "%d %d"
UnaryOp: &
ID: number1
UnaryOp: &
ID: number2
If:
BinaryOp: >=
ID: number1
ID: number2
Compound:
If:
BinaryOp: ==
ID: number1
ID: number2
Compound:
FuncCall:
ID: printf
ExprList:
Constant: string, "Result: %d = %d"
ID: number1
ID: number2
Compound:
FuncCall:
ID: printf
ExprList:
Constant: string, "Result: %d > %d"
ID: number1
ID: number2
Compound:
FuncCall:
ID: printf
ExprList:
Constant: string, "Result: %d < %d"
ID: number1
ID: number2
Return:
Constant: int, 0
答案 0 :(得分：0)
这看起来像是正确的AST。顶部的所有Typedef节点都来自pycparser的“假”标头，以帮助其正确解析文件，您几乎可以忽略它们。
AST只是节点的递归树；每个节点都是一个Node对象。您可以迭代其子节点（即其他节点），使用.coord属性查看其原始源位置，依此类推。有几个查看AST节点的示例，例如explore_ast。
要查找特定节点，您可能需要编写访问者。这样做的例子很多，例如func_calls。