From Source Code To Machine Code Build Your Own
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from source code to machine code: building your own compiler (simplified)
this tutorial provides a simplified overview of the compilation process, from high-level source code to executable machine code. we won't build a full-fledged compiler (that's a massive undertaking!), but we'll create a rudimentary "compiler" for a very small subset of a programming language to illustrate the core concepts. we'll focus on a simple language that only supports addition and variable assignment.
*1. lexical analysis (scanning):*
the first step is to break down the source code into meaningful units called tokens. think of tokens as the basic building blocks of the language – keywords (like `let`), identifiers (variable names), operators (+, =), and literals (numbers).
let's consider a simple language definition:
this is a context-free grammar (cfg) defining the structure of our language. we won't formally parse it, but it guides our lexer.
python code for a simple lexical analyzer:
*2. syntax analysis (parsing):*
the parser takes the stream of tokens and checks if they conform to the grammar of the language. a common approach is to use a recursive descent parser or a parser generator like antlr or yacc/bison. for simplicity, we'll skip a formal parser in this example and assume the lexer produces a token stream in a suitable order for direct interpretation.
*3. semantic analysis:*
this phase checks the meaning of the code. does it make sense? are variable types correct? are there any undefined variables? we'll perform simple semantic analysis in our simplified example.
*4. intermediate representation (ir):*
the compiler translates the source code into an intermediate representation (ir), a lower-level representation that's easier to optimize and translate to machine code. a common ir is three-address code (tac).
*5. code generation:*
this is where the ir is translated into machine code. this involves selecting appropriate instructions for th ...
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