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Solaris Dynamic Tracing Guide
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Document Information


1.  Introduction

2.  Types, Operators, and Expressions

3.  Variables

4.  D Program Structure

5.  Pointers and Arrays

Pointers and Addresses

Pointer Safety

Array Declarations and Storage

Pointer and Array Relationship

Pointer Arithmetic

Generic Pointers

Multi-Dimensional Arrays

Pointers to DTrace Objects

Pointers and Address Spaces

6.  Strings

7.  Structs and Unions

8.  Type and Constant Definitions

9.  Aggregations

10.  Actions and Subroutines

11.  Buffers and Buffering

12.  Output Formatting

13.  Speculative Tracing

14.  dtrace(1M) Utility

15.  Scripting

16.  Options and Tunables

17.  dtrace Provider

18.  lockstat Provider

19.  profile Provider

20.  fbt Provider

21.  syscall Provider

22.  sdt Provider

23.  sysinfo Provider

24.  vminfo Provider

25.  proc Provider

26.  sched Provider

27.  io Provider

28.  mib Provider

29.  fpuinfo Provider

30.  pid Provider

31.  plockstat Provider

32.  fasttrap Provider

33.  User Process Tracing

34.  Statically Defined Tracing for User Applications

35.  Security

36.  Anonymous Tracing

37.  Postmortem Tracing

38.  Performance Considerations

39.  Stability

40.  Translators

41.  Versioning



Generic Pointers

Sometimes it is useful to represent or manipulate a generic pointer address in a D program without specifying the type of data referred to by the pointer. Generic pointers can be specified using the type void *, where the keyword void represents the absence of specific type information, or using the built-in type alias uintptr_t which is aliased to an unsigned integer type of size appropriate for a pointer in the current data model. You may not apply pointer arithmetic to an object of type void *, and these pointers cannot be dereferenced without casting them to another type first. You can cast a pointer to the uintptr_t type when you need to perform integer arithmetic on the pointer value.

Pointers to void may be used in any context where a pointer to another data type is required, such as an associative array tuple expression or the right-hand side of an assignment statement. Similarly, a pointer to any data type may be used in a context where a pointer to void is required. To use a pointer to a non-void type in place of another non-void pointer type, an explicit cast is required. You must always use explicit casts to convert pointers to integer types such as uintptr_t, or to convert these integers back to the appropriate pointer type.