FreeBASIC DevFbcParserToplevel

最上位の解析プロセス

• Open the input .bas
• Start the emitter (ir) (Open the output .asm)
• fbMainBegin() (Build the AST for the implicit main() or static constructor for module-level code)
• fbPreIncludes()
  • fbIncludeFile() for every preinclude (found on the fbc command line)
• cProgram()
• fbMainEnd() (Close the implicit main())
• Finish emitting (ir) (Finish generating the .asm and close it)
• Close the input .bas

• Include file search
• lexPush() (Push a new lexer context to parse this #include file without disturbing the lexer's state in the parent file)
• Open the include file
• cProgram()
• Close the include file
• lexPop() (Restore the lexer state to the parent file)

• cLine() repeatedly until EOF
  • cLabel()
  • cStatement()
    • Declarations
      • UDT declarations, typedefs
      • Variables (DIM, VAR, ...)
      • Procedure declarations (DECLARE)
      • Procedure bodies (SUB, FUNCTION, ...)
        (Procs temporarily replace the implicit module level procedure, so any AST nodes go into them instead of the implicit main())
        
    • Compounds statements (IF/ELSE, DO/LOOP, EXIT/CONTINUE DO, ...)
    • Procedure calls
    • Function result assignments
    • Quirk statements (special QB rtlib/gfxlib statements)
    • ASM blocks
    • Assignments
    • Procedure pointer calls