Mini-C-Compiler

A compiler that works for a smaller subsection of the C language. It compiles a C-like language into MIPS assembly code.

Features & Support

The compiler can take advantage of the following features:

Integer Variables & Expressions

• Integer Literals, Variables
• Variables must be declared before they are used (all declarations before other statements)
• Assignment Statement
• Arithmetic Operators
  • +, - (binary subtraction), \*, /, %, - (unary minus)
  • ^ (exponentiation) PRE: >= 0

Boolean Variables & Expressions

• Boolean Literals, Variables
• Variables must be declared before they are used (all declarations before other statements)
• Assignment Statement
• Relational Operators
  • <, <=, ==, >=, >, !=
• Boolean Operators
  • !, &&, ||

I/O Control

• read(comma delimited list of variables)
  • Ex. read(x, y, z)
• print(comma delimited list of expressions);
  • Print results on the current line
  • Print a space between values
  • A newline is not printed
  • Ex. print(2*x, x^3*(z\*w), abc/xyz, c)
• printlines(expression)
  • Print expression number of newlines (\n)
  • Ex. printlines(2)
• printspaces(expression)
  • Print expression number of spaces
  • Ex. printspaces(3\*n)
• printString(“Literal String”)
  • Print a literal representation of the provided string

Control Structures

• if statements including optional else
• while loops
• Uses C syntax & C definition of true (non-zero) and false (zero)

1D & 2D Arrays

• Size of the array is declared at compile time
• Subscripts can use constants and expressions.
  • Ex. nums[2*i] = z * nums[j-3*k]

Compilation & Execution

Compile Yacc file

$ yacc -d ExprEval.y

OR

$ bison -dy ExprEval.y

Compile Lex file

$ lex lex.l

OR

$ flex lex.l

Compile C files into Executable

$ cc -o comp lex.yy.c y.tab.c SymTab.c Semantics.c CodeGen.c IOMngr.c main.c

Run Executable

$ ./comp <file to compile> <error output file> <compilation output file>

Run MIPS code

$ spim run <asm file>