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Startup Code Variable Initialization Code Basic I/O Memory Allocation Optimizer General Optimizations 251-Specific Optimizations Options for Code Generation Global Register Coloring Segment Naming Conventions Segment Types Initialization Segments Function Symbols Parameter Passing Symbols Hardware Stack Calculating Stack Size Interfacing C Programs to Assembler Global Variables Function Parameters Passing in Memory Passing in Registers Function Return Values Using the SRC Directive Register Usage Overlaying Segments TINY Model XTINY Model SMALL Model XSMALL Model LARGE Model Data Storage Formats Bit Variables 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars Floating-point Numbers Floating-point Errors Double Numbers Double Errors Absolute Memory Locations Absolute Access Macros Linker Location Controls The _at_ Keyword Debugging Error Messages Library Reference AppendixFunction Symbols
By default, C251 uses the unmodified function name as symbol reference in the object files. The function names for code which is reentrant, uses C51 parameter passing, or ends with the ERET instruction are modified slightly to avoid run time errors. The following table lists the symbol name generated for the function declaration below:
void TestFunction (char c) ...
| Symbol Name Prefix | Description |
|---|---|
| TestFunction | For standard code generation the function names are not modified. |
| TestFunction? | For code which ends with returns with a ERET instruction a question mark (?) is appended at the symbol name. |
| TestFunction?_ | For reentrant code a (?) and (_) is appended at the symbol name. |
| TestFunction?? | For reentrant code which returns with a ERET instruction two question marks (??) are appended at the symbol name. |
| TESTFUNCTION | For functions with PL/M-51 or C251 parameter passing the function name is converted to uppercase. |
| _TESTFUNCTION | For functions with C51 parameter passing, the function name is converted to uppercase and prefixed with "_" when the function receives parameters in registers. |
All symbol names are converted to uppercase letters when the C251 directive NOCASE is applied. Refer to NOCASE for more information.
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