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Learn more about the alloc_text pragma directive in Microsoft C/C++ |
alloc_text pragma |
01/22/2021 |
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Names the code section where the specified function definitions are placed. The pragma must occur between a function declarator and the function definition for the named functions.
#pragma alloc_text("text-section",function_1 [,function_2 ... ])
The alloc_text pragma doesn't handle C++ member functions or overloaded functions. It's applicable only to functions declared with C linkage, that is, functions declared with the extern "C" linkage specification. If you attempt to use this pragma on a function with C++ linkage, a compiler error is generated.
Since function addressing using __based isn't supported, specifying section locations requires the use of the alloc_text pragma. The name specified by text-section should be enclosed in double quotation marks.
The alloc_text pragma must appear after the declarations of any of the specified functions and before the definitions of these functions.
Functions referenced in an alloc_text pragma should be defined in the same module as the pragma. Otherwise, if an undefined function is later compiled into a different text section, the error may or may not be caught. Although the program will usually run correctly, the function won't be allocated in the intended sections.
Other limitations on alloc_text are as follows:
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It can't be used inside a function.
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It must be used after the function has been declared, but before the function has been defined.