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Using the Inline and Embedded Assemblers of the AR
Compiler support for inline assembly language
Inline assembler support in the compiler
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Inline assembly language syntax with the __asm key
Inline assembly language syntax with the asm keywo
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__offsetof_base keyword for related base classes i
Compiler-supported keywords for calling class memb
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__mcall_offsetof_vbase(D, f)
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__offsetof_base keyword for related base classes in embedded assembler
| Non-Confidential |  PDF version | ARM DUI0375H | ||
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| Home > Using the Inline and Embedded Assemblers of the ARM Compiler > __offsetof_base keyword for related base classes in embedded assembler | ||||
6.34 __offsetof_base keyword for related base classes in embedded assembler
The __offsetof_base keyword enables you to determine the offset from the beginning of an object to a base class sub-object within it.
__offsetof_base(D, B)
B must be an unambiguous, nonvirtual base class of D.Returns the offset from the beginning of a
D object to the start of the
B base subobject within it. The result might be zero. The following
example shows the offset (in bytes) that must be added to a D* p to
implement the equivalent of static_cast<B*>(p).__asm B* my_static_base_cast(D* /*p*/) // equivalent to:
// return static_cast<B*>(p)
{
if __offsetof_base(D, B) <> 0 // optimize zero offset case
ADD r0, r0, #__offsetof_base(D, B)
endif
BX lr
}
The
__offsetof_base, __mcall_*, and _vcall_offsetof_vfunc keywords are converted into
integer or logical constants in the assembly source code. You can only use it in __asm functions, not in __cpp
expressions.| Non-Confidential | PDF version | ARM DUI0375H |
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