Walk the stages in order for From Source Files to a Running Program: start from the contract, trace the representation through the operation, then confirm the boundary. Worked case: If module A calls a function defined in module B, A’s object file can contain a symbol reference that the linker resolves. For a worked explanation, continue to the topic article and execution trace.
Stage-by-stage execution walkthrough
This request flow decomposes From Source Files to a Running Program into 5 sequential stages so you can trace where latency accumulates, which state transitions are irreversible, and where production failure modes occur.
Stage 1: Contract
A build turns source text and dependencies into an executable representation through distinct stages. A compiler typically parses and checks source, translates it to an intermediate or machine representation, and emits object files. A linker resolves references across those objects and libraries to produce a loadable program. During this transition, the runtime enforces strict state invariants before handing control to the next stage: inputs are validated at the boundary, state mutations are ordered deterministically, and latency/resource costs are bounded so downstream consumers never observe a torn or partially initialized state.
Stage 2: Representation
If module A calls a function defined in module B, A’s object file can contain a symbol reference that the linker resolves. At startup, the operating system maps executable segments, prepares process state, and transfers control to runtime startup code before the application entry point. During this transition, the runtime enforces strict state invariants before handing control to the next stage: inputs are validated at the boundary, state mutations are ordered deterministically, and latency/resource costs are bounded so downstream consumers never observe a torn or partially initialized state.
Stage 3: Operation
A function declaration is visible to a source file, but the final build reports that its implementation is missing. Identify the likely build stage and two places to investigate. During this transition, the runtime enforces strict state invariants before handing control to the next stage: inputs are validated at the boundary, state mutations are ordered deterministically, and latency/resource costs are bounded so downstream consumers never observe a torn or partially initialized state.
Stage 4: Boundary
Compilation and linking errors indicate different classes of problems: a syntax or type error occurs before object generation, while an unresolved symbol is often discovered at link time. Dynamic linking can defer library resolution to load or runtime, introducing version and search-path concerns. During this transition, the runtime enforces strict state invariants before handing control to the next stage: inputs are validated at the boundary, state mutations are ordered deterministically, and latency/resource costs are bounded so downstream consumers never observe a torn or partially initialized state.
Stage 5: Result
A function declaration is visible to a source file, but the final build reports that its implementation is missing. Identify the likely build stage and two places to investigate. During this transition, the runtime enforces strict state invariants before handing control to the next stage: inputs are validated at the boundary, state mutations are ordered deterministically, and latency/resource costs are bounded so downstream consumers never observe a torn or partially initialized state.
Production invariants and failure modes
Done when the worked check holds: A function declaration is visible to a source file, but the final build reports that its implementation is missing. When debugging or capacity-planning this flow in production, instrument each stage boundary separately (measuring both p50 median and p99.9 tail latency), verify what happens when an intermediate stage times out or drops packets, and ensure retry or fallback paths preserve end-to-end idempotency.