Hello World from Scratch
summary
Starts with a bare C++ hello world and traces every concrete step to a runnable ELF binary: preprocessor -> compiler front/middle/back -> assembler -> linker; shows macros and includes as textual substitution, lexing/parsing into an AST, IR (LLVM) lowering, liveness analysis and graph‑coloring register allocation, instruction selection (macro expansion vs SelectionDAG), scheduling and peephole optimizations, emitting .rodata and .text with relocations, linker resolving puts from libc, and finally the bytes execute and print "hello world".
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chapters (12)
- 0:00Introduction to Hello World
- 1:26Hello World in C
- 7:52Compiler overview
- 15:22Front end of compiler
- 29:11Lexing and parsing
- 37:10Semantic analysis
- 40:20Intermediate representation
- 49:19Middle end optimizations
- 58:30Back end compilation
- 1:07:03Register allocation
- 1:15:30Assembling and linking
- 1:19:43Final executable
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