HC3 -- C-Compiler

Basic Data Types + Operations

• short
  • arithmetic operations
    • + addition
    • - subtraction
    • * multiplication
    • / division
    • % modulo
  • assignments
    • = assignment
    • ++ increment
    • -- decrement
    • combined +=, -=, ...
  • comparisons
    • == equals
    • != not equals
    • > greater than
    • < less than
    • >= greater or equal than
    • <= less or equal than
  • propositional logic
    • ! not
    • && and
    • || or
  • bit manipulation
    • & bitwise AND
    • | bitwise OR
    • ^ bitwise XOR
    • ~ bitwise NOT
    • << shift bitwise left
    • >> shift bitwise right
  • other
    • ? conditional operator
• float
  • arithmetic operations
    • + addition
    • - subtraction
    • * multiplication
    • / division

Keywords

• data types
  • void
  • short
  • float
• conditional execution
  • if, else if, else
  • switch case
• loops
  • for
  • while
  • do while
• jumps
  • return
  • break

Supported C-Elements

• function calls
• function definitions
• global variables
• constants
• code blocks { ... }

Build-In Functions

There is no need for an include directive to use the following functions.

• short GetSW(); returns value of switches SW15 ... SW0
• short GetKEY0(); returns value of button KEY0
• short GetKEY1(); returns value of button KEY1
• void SetLEDR(short value); sets LEDR(15 ... 0) to value
• void SetHEX0(short value); sets HEX0 to value (without conversion)
• void SetHEX1(short value); sets HEX1 to value (without conversion)
• void SetHEX2(short value); sets HEX2 to value (without conversion)
• void SetHEX3(short value); sets HEX3 to value (without conversion)
• void SetHEX4(short value); sets HEX4 to value (without conversion)
• void SetHEX5(short value); sets HEX5 to value (without conversion)
• void SetHEX6(short value); sets HEX6 to value (without conversion)
• void SetHEX7(short value); sets HEX7 to value (without conversion)

Basic main function

short main()
{
    short a = GetLEDR();
    SetLEDR(a);
    
    float b = 12.5;
    short c = b; // automatic typecast -> c = 12
    return 0;
}

using the compiler

python3 main.py optimization_level input_file input_file: must have .c ending optimization_level: fake, not used The output file is determined by changing the input_file ending to .asm Example: python3 main.py 0 main.c

Dependencies

• Python C-Parser
• Numpy

Changelog

• 09.01.2020 [Sebastian Bräske, Manuel Bloedow, Matthias Rosenthal]
  • fixed bug with new pycparser which cased compilation fail
  • fixed bug when requesting value of key0 or key1
  • added support of new HC 3 float <-> short conversion
  • added possibility for loading float numbers via LUI + LLI
  • refactored code

(c) Technische Hochschule Mittelhessen