[C2AST] Generate AST from C code

[felixpk]

Proposal

Writing AST tests can be quite verbose, therefore I propose to implement a converter which translates c code to dewolfs AST implementation.

Approach

1. Use pycparser to generate an intermediate AST representation
2. Translate each AST node to dewolfs AST representation

[felixpk]

/cib

[github-actions[bot]]

Branch issue-38-_C2AST_Generate_AST_from_C_code created!

[felixpk]

What does currently work?

• AbstractSyntaxTreeNode
• Expression
• Instruction
• Operation
• Distinction between Function and Imported Function Symbols
• Compound operators

What does currently not work?

• printf("i is %d\n", i); becomes printf("i is %d\\n", i); (encoding problem)

• comments are ignored (pycparser limitation)

• If the input code contains an array like int numbers[10]; we need to convert it to int *numbers = malloc(sizeof(int) * 10); this implies that we also have to free the allocated memory after the last usage of numbers.

• Structs are not implemented in dewolf

  struct {
  int age;
  char* name;
  } p1;
  
  p1.age = 18;
  p1.name = "Peter";

  (Not sure how to convert it)