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10. SBF Virtual Machine & Architecture

Registers, stack limits, and execution mechanics.

1 min read2 questionsup to 50 XPtopic 10/100

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The Solana VM executes SBF bytecode. Key constraints include: 11 registers (r0-r10), a fixed 4KB stack frame, a 32KB heap allocation (expandable), and no arbitrary dynamic memory allocations.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. What is the stack size limit per call frame in Solana programs?

  2. 2. How do you handle large data structures in Solana without blowing the stack?

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