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## Chapter 6
Code issues

This chapter gives detailed information on the generated code by Free Pascal. It can be useful to write external object files which will be linked to Free Pascal created code blocks.

6.1 Register Conventions
accumulator register
accumulator 64-bit register
float result register
self register
frame pointer register
stack pointer register
scratch registers
Processor mapping of registers
6.2 Name mangling
Mangled names for data blocks
Mangled names for code blocks
Modifying the mangled names
6.3 Calling mechanism
6.4 Nested procedure and functions
6.5 Constructor and Destructor calls
objects
classes
6.6 Entry and exit code
Intel 80x86 standard routine prologue / epilogue
Motorola 680x0 standard routine prologue / epilogue
6.7 Parameter passing
Parameter alignment
6.8 Processor limitations

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