# SPARK_BC dump
# SPARK_BC is orchestration bytecode — not neural weights.
# Not HuggingFace. Not imported tensors. Spark's own binary.
#
# Source: examples/spark_train_step.spark
# Command: ./spark-bootstrap --compile examples/spark_train_step.spark -o docs/examples/spark-train-step.sparkbc
# sha256: d08925b52bf8c840de626c9cfec619d4dbae5a674b94bb8c7c5837eb1ac64551
# size: 201 bytes
#
# First 32 hex bytes:
# 53 50 42 43 01 09 00 04 00 63 6f 64 65 03 00 6a 6f 62 11 00 73 70 61 72 6b 5f 64 69 73 74 69 6c
#
# File layout (little-endian, docs/SPARK_BC.md):
# offset 0 magic 'S''P''B''C'
# offset 4 version 0x01
# then u16 nstrings, string pool, u16 nconsts,
# const pool (u8 kind + u16 payload), u32 ncode, code

## xxd
00000000: 53 50 42 43 01 09 00 04 00 63 6f 64 65 03 00 6a SPBC.....code..j
00000010: 6f 62 11 00 73 70 61 72 6b 5f 64 69 73 74 69 6c ob..spark_distil
00000020: 6c 5f 63 70 75 15 00 6f 75 74 2f 74 72 61 69 6e l_cpu..out/train
00000030: 2f 6a 6f 62 2d 64 72 79 2d 30 30 31 0c 00 66 69 /job-dry-001..fi
00000040: 78 74 75 72 65 2d 62 61 73 65 25 00 65 78 61 6d xture-base%.exam
00000050: 70 6c 65 73 2f 66 69 78 74 75 72 65 73 2f 74 72 ples/fixtures/tr
00000060: 61 69 6e 2f 64 61 74 61 73 65 74 2e 6a 73 6f 6e ain/dataset.json
00000070: 6c 04 00 73 74 65 70 0b 00 6a 6f 62 2d 64 72 79 l..step..job-dry
00000080: 2d 30 30 31 06 00 73 74 61 74 75 73 09 00 00 00 -001..status....
00000090: 00 00 01 00 00 02 00 00 03 00 00 04 00 00 05 00 ................
000000a0: 00 06 00 00 07 00 00 08 00 1c 00 00 00 01 00 00 ................
000000b0: 26 05 00 04 00 03 00 02 00 01 00 28 07 00 06 00 &..........(....
000000c0: 27 07 00 08 00 03 01 00 00 '........

## Header
magic: SPBC
version: 1
nstrings: 9
nconsts: 9
ncode: 28
code_off: 173

## String pool
0: 'code' (4 bytes)
1: 'job' (3 bytes)
2: 'spark_distill_cpu' (17 bytes)
3: 'out/train/job-dry-001' (21 bytes)
4: 'fixture-base' (12 bytes)
5: 'examples/fixtures/train/dataset.jsonl' (37 bytes)
6: 'step' (4 bytes)
7: 'job-dry-001' (11 bytes)
8: 'status' (6 bytes)

## Constant pool (kind 0 = STR → string index)
0: kind=0 payload=0 → 'code'
1: kind=0 payload=1 → 'job'
2: kind=0 payload=2 → 'spark_distill_cpu'
3: kind=0 payload=3 → 'out/train/job-dry-001'
4: kind=0 payload=4 → 'fixture-base'
5: kind=0 payload=5 → 'examples/fixtures/train/dataset.jsonl'
6: kind=0 payload=6 → 'step'
7: kind=0 payload=7 → 'job-dry-001'
8: kind=0 payload=8 → 'status'

## Code (opcode + u16le const indices)
code+0 01 00 00 MODEL (0x01) const0 "code"
code+3 26 05 00 04 00 03 00 02 00 01 00 TRAIN (0x26) const5 "examples/fixtures/train/dataset.jsonl" const4 "fixture-base" const3 "out/train/job-dry-001" const2 "spark_distill_cpu" const1 "job"
code+14 28 07 00 06 00 STEP (0x28) const7 "job-dry-001" const6 "step"
code+19 27 07 00 08 00 TRAIN_STATUS (0x27) const7 "job-dry-001" const8 "status"
code+24 03 01 00 PRINT (0x03) const1 "job"
code+27 00 HALT (0x00)