Files
STM32F4-Base/tools/arch_diagram/gen_memory_svg.py
T
wandering1 2525c2d948 docs(104): 端口口径统一成「工厂默认」,登记「改后立即重 bind」待办
用户裁定两条:① 剩余裸写端口的地方加「工厂默认」限定词,不改固件行为;
② 生效语义按需求口径「保存即生效」定,现实现(端口下次重 bind 才生效)是
要改的一侧 → 建任务登记,本笔不动代码行为。

限定词(24 处 / 17 文件):AGENTS 数据主线、App/protocol/README、根 README
文档索引、Src/freertos.c 三处任务注释、docs/README、项目启动顺序管理、存储
架构说明、软件架构与运行时规格(2)、RAM 使用分析、产品需求设计文档(5)、
项目架构总览(3)、test/host/README、iec104_master 流程注释、IEC104 上行设
计说明、继电保护功能复现规划。配图两张同批重跑:gen_arch_svg.py 与
gen_memory_svg.py(脚本与产物同一笔)。

两处陈旧计数(都做过双源核证):
- 测试开发标准流程 像素层「60 内容页」→ 内容页黄金参考 66 张(64 页);
  双源 = simulator/tests/ref/shot_*.bin 实数 66 与 check_content_pages.py
  的 PAGES 66 条(含两个 _p2)。
- .pre-commit-config.yaml 的 uinav-selftest 注释「18 张黄金参考」→ 写成
  「接线当时 18 张、现 66 张」:git log -S 定到 6a904c1b(2026-10-25),那
  天 ref 目录确实 18 张,写时为真,但它描述的是钩子现有行为,属当前态。

口径修正与登记:
- 页面扩充详细方案「通讯设置 = 无配置模型(端口与 CA 都是 #define)」→ 标
  「当时」,并写明现已在 /config.ini 的 [comm] 段可配、UI 通讯设置页可改。
- 产品需求 §通讯配置:删掉「改后需重启生效」这句把两件事混为一谈的话,改成
  需求要求「保存即生效」+ 现实现(公共地址重启、端口下次重 bind)+ 指向登记簿。
- docs/任务规划/登记簿.md §1 新增「104 端口改后立刻重 bind」:含隐性耦合
  —— .serialtest/config.json 的必检锚点写死 listening on 2404,端口一改串口
  回归必假失败;改行为时要么锚点只查 listening on,要么由脚本注入端口。

复扫(旧形态归零判据)剩 20 处未带限定词,逐条定性为刻意不改:默认值定义处、
出厂模板与断言、usage 与 argparse default、UI 黄金参考显示值、台架主站地址
(同数不同义)、串口锚点、叙事句、引用关系图坐标。逐条理由见一次性台账。

门禁:check_doc_links --sections-strict 对 16 篇改动 .md 逐个 rc=0;
check_mermaid --all 31 文件 62 围栏新发 0;check_nested_comment --all 449
文件新发 0;check_bom_drift --all 99 个名单内文件无漂移;
check_generated_fresh PASS(25 生成器 / 21 一致 / 4 只减不增基线);字节体检
无新增 BOM / CR / U+FFFD / 行尾空格(三连空行与 HEAD 逐项相同 = 存量)。
/keil-build 0 错 0 警,Program Size Code=246720 RO=29836 RW=2052 ZI=149708
与凭证同码:本笔只碰注释与配图文字,无固件行为变更。
2026-10-30 15:40:27 +08:00

418 lines
18 KiB
Python
Raw Blame History

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#!/usr/bin/env python3
"""Generate memory layout SVG diagrams for STM32F4-Base.
Usage:
python tools/arch_diagram/gen_memory_svg.py [--type ram|flash|taskstack|all]
Output (default --all):
docs/images/内存布局_RAM.svg
docs/images/内存布局_FLASH.svg
docs/images/任务栈预算.svg
"""
import argparse
import os
import sys
# ---------------------------------------------------------------------------
# Diagram data
# ---------------------------------------------------------------------------
# ── RAM breakdown (2026-10-22 构建, map Grand Totals; data/ram_report_20261022.md) ──
# Region 1: main SRAM RW_IRAM1 @0x20000000 (128KB = 131,072 B, DMA-reachable)
SRAM1_TOTAL = 131072
SRAM1_USED = 75264
SRAM1_FREE = SRAM1_TOTAL - SRAM1_USED
# Region 2: CCM RW_CCM @0x10000000 —— scatter 给的是 0x0000FF00 = 65,280 B(CPU only,
# DMA 不可达);另有 0x1000FF00 起 256 B 的 UNINIT_CCM 尾区(.noinit 崩溃现场用 48 B)
CCM_TOTAL = 65280
CCM_USED = 57376
CCM_FREE = CCM_TOTAL - CCM_USED
RAM1_CATEGORIES = [
("LVGL 池 16KB", 16876, "#4CAF50"),
("UI", 13546, "#FF9800"),
("lftpd", 8440, "#8BC34A"),
("FTL/BBT", 7036, "#9C27B0"),
("NET/CH395F", 5250, "#F44336"),
("CMSIS-RTOS", 1724, "#00BCD4"),
("HAL", 84, "#607D8B"),
("C stack", 1024, "#795548"),
("other", 21284, "#9E9E9E"),
("free", SRAM1_FREE, "#E0E0E0"),
]
RAM2_CATEGORIES = [
("FreeRTOS 堆", CCM_USED, "#2196F3"),
("free", CCM_FREE, "#E0E0E0"),
]
# ── Flash breakdown (1MB = 1,048,576 B; 2026-10-23 构建) ──────────────────
FLASH_TOTAL = 1048576
FLASH_CODE = 213676
FLASH_RO = 18860
FLASH_RW = 1188
FLASH_USED = FLASH_CODE + FLASH_RO + FLASH_RW # ROM 合计(含 RW 初始化表)
FLASH_IROM = FLASH_CODE + FLASH_RO # ER_IROM1 区用量 = 232,536 B(22.2%)
FLASH_FREE = FLASH_TOTAL - FLASH_USED
FLASH_CATEGORIES = [
("代码段 (Code)", FLASH_CODE, "#2196F3"),
("只读数据 (RO)", FLASH_RO, "#4CAF50"),
("初始化数据 (RW)", FLASH_RW, "#FF9800"),
("Flash 空闲", FLASH_FREE, "#E0E0E0"),
]
# Flash Code+RO 分布(= ER_IROM1 232,536 B;2026-10-23 按 .map 对象表逐对象归类,
# 口径同 data/ram_report_20261023.md;"其他"含链接器填充)
FLASH_CODE_SUB = [
("LVGL 库", 87706, "#4CAF50"),
("应用代码/UI", 57047, "#2196F3"),
("CH395F+FTP", 25916, "#F44336"),
("HAL 驱动", 17876, "#607D8B"),
("dhara / FTL", 11222, "#FF9800"),
("FreeRTOS 内核", 10762, "#00BCD4"),
("FatFS", 8468, "#9C27B0"),
("C 库 (microlib)", 5486, "#795548"),
("startup", 468, "#B0BEC5"),
("其他 (长尾)", 7585, "#E0E0E0"), # remainder(2026-10-23 的零散增量)
]
# ── Task stack budgets (2026-10-22 构建 + 同日真机 [STACK] 实测; data/stack_report_20261022.md) ──
# (name, cfg, prio, worst, peak_used, margin, margin_pct, verdict, desc)
# worst = max(静态最坏深度, 实测峰值); margin = cfg - worst
# 9 行含 testTask(仅测试构建创建、无实测 → 取静态最坏链,峰位列填同值)
TASK_STACKS = [
("defaultTask", 5120, "Normal", 3024, 2152, 2096, 40, "PASS", "FatFS 挂载/探针 + 配置引擎 + syslog + LED"),
("netTask", 3840, "Normal", 1912, 1116, 1928, 50, "PASS", "CH395F 轮询、消息处理"),
("ftpTask", 4096, "Normal", 1456, 1404, 2640, 64, "PASS", "lftpd FTP 服务(大缓冲已静态化)"),
("uiTask", 16384, "BelowNormal", 4052, 4052, 12332, 75, "PASS", "LVGL UI 主循环 + 远程显示推流"),
("testTask", 8192, "BelowNormal", 736, 736, 7456, 91, "PASS", "测试套件(产品构建不创建,取静态最坏链)"),
("timeSyncTask", 2560, "Normal", 1264, 648, 1296, 50, "PASS", "TCP 时间同步(8888)"),
("adcTask", 2560, "AboveNormal", 1320, 952, 1240, 48, "PASS", "1 kHz 节拍消费者(语义取数与有效性采集,纯取数)"),
("iec104Task", 2560, "Normal", 1456, 540, 1104, 43, "PASS", "IEC 60870-5-104 上行(默认 2404)"),
("protectTask", 2048, "Normal", 872, 828, 1176, 57, "PASS", "20 ms 保护判据 + 闭锁 + 定值校验和巡检"),
]
KERNEL_STACKS = [("idle", 512), ("timer", 1024)] # 128/256 words(未实测)
HEAP_TOTAL = 57344 # configTOTAL_HEAP_SIZE 56 KB(位于 RW_CCM;段实占 57,376 B 含元数据)
HEAP_FREE = 15800 # 2026-10-22 真机 [STACK](启动 + 网络/FTP/104 就绪后)
HEAP_MIN_EVER = 8464
TOTAL_STACKS = sum(t[1] for t in TASK_STACKS) # 47,360(含 testTask;产品构建 8 任务 = 39,168)
# ---------------------------------------------------------------------------
# SVG helpers
# ---------------------------------------------------------------------------
def _text_width(text, char_w=7.2):
"""Rough monospace text width estimate (px)."""
return len(text) * char_w
def _wrap(text, max_chars=12):
"""Wrap label to multiple <tspan> lines."""
words = text.split("\n") if "\n" in text else text.split()
lines = []
current = ""
for w in words:
test = (current + " " + w).strip() if current else w
if len(test) > max_chars and current:
lines.append(current)
current = w
else:
current = test
if current:
lines.append(current)
return lines
def svg_header(w, h):
return (
f'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 {w} {h}" '
f'width="{w}" height="{h}" style="font-family:Consolas,\'Courier New\',monospace; '
f'font-size:12px; background:#fff">\n'
'<defs>\n'
'<style>\n'
'.title { font-size:14px; font-weight:bold; }\n'
'.label { font-size:11px; }\n'
'.legend-text { font-size:10px; }\n'
'.bar-seg { stroke:#fff; stroke-width:0.5; }\n'
'</style>\n'
'</defs>\n'
)
def svg_footer():
return '</svg>\n'
def _draw_bar_segment(x, y, w, h, fill, label_inside, label_outside="",
label_font=10, min_inside_w=40):
"""Return SVG fragment for a bar segment with label."""
parts = []
parts.append(f' <rect class="bar-seg" x="{x}" y="{y}" width="{w:.1f}" height="{h}" '
f'fill="{fill}" rx="2"/>\n')
if w > min_inside_w and label_inside:
# Center text inside bar
lines = _wrap(label_inside, max_chars=int(w / 7))
ty = y + h / 2 - (len(lines) - 1) * 6
for line in lines:
lx = x + w / 2
parts.append(f' <text x="{lx:.1f}" y="{ty:.1f}" text-anchor="middle" '
f'dominant-baseline="central" class="label" fill="#000">{line}</text>\n')
ty += 12
elif label_outside:
lx = x + w + 4
ty = y + h / 2
parts.append(f' <text x="{lx:.1f}" y="{ty:.1f}" text-anchor="start" '
f'dominant-baseline="central" class="legend-text" fill="#333">{label_outside}</text>\n')
return "".join(parts)
# ---------------------------------------------------------------------------
# Diagram generators
# ---------------------------------------------------------------------------
def gen_ram_svg():
"""内存布局_RAM.svg — 两条堆叠条:主 SRAM(DMA 可达)+ CCM(仅 CPU)。"""
W, H = 820, 360
BAR_X, BAR_H = 60, 44
SCALE = (W - 80) / SRAM1_TOTAL # 128KB 占满宽;CCM (64KB) 占半宽
svg = svg_header(W, H)
svg += f'<text x="{W/2}" y="24" text-anchor="middle" class="title">SRAM (192KB) 使用布局 — 2026-10-22 构建</text>\n'
# Region 1: 主 SRAM
y1 = 50
svg += f'<text x="{BAR_X}" y="{y1-8}" class="label" fill="#555">主 SRAM RW_IRAM1 @0x20000000(128KB,DMA 可达)</text>\n'
x = BAR_X
for label, size, color in RAM1_CATEGORIES:
w = size * SCALE
if w < 1:
continue
inside = label if w > _text_width(label) + 10 else ""
svg += _draw_bar_segment(x, y1, w, BAR_H, color, inside, "")
x += w
svg += f'<text x="{BAR_X}" y="{y1+BAR_H+18}" class="label" fill="#333">'
svg += f'已用: {SRAM1_USED}B ({SRAM1_USED/SRAM1_TOTAL*100:.1f}%)'
svg += f' 空闲: {SRAM1_FREE}B ({SRAM1_FREE/SRAM1_TOTAL*100:.1f}%)'
svg += f' 总量: 128KB</text>\n'
# Region 2: CCM
y2 = y1 + BAR_H + 50
svg += f'<text x="{BAR_X}" y="{y2-8}" class="label" fill="#555">CCM RW_CCM @0x10000000(段 65,280 B;仅 CPU 可达、DMA 不可达 → R2/R3)</text>\n'
x = BAR_X
for label, size, color in RAM2_CATEGORIES:
w = size * SCALE
if w < 1:
continue
inside = label if w > _text_width(label) + 10 else ""
svg += _draw_bar_segment(x, y2, w, BAR_H, color, inside, "")
x += w
svg += f'<text x="{BAR_X}" y="{y2+BAR_H+18}" class="label" fill="#333">'
svg += f'已用: {CCM_USED}B ({CCM_USED/CCM_TOTAL*100:.1f}%)'
svg += f' 空闲: {CCM_FREE}B ({CCM_FREE/CCM_TOTAL*100:.1f}%)'
svg += f' 总量: 63.75KB(+256 B UNINIT_CCM 尾区)——CCM 是当前全局卡点</text>\n'
# Legend(主 SRAM 两列 + CCM 两行)
ly = y2 + BAR_H + 40
lx = 60
half = (len(RAM1_CATEGORIES) + 1) // 2
for i, (label, size, color) in enumerate(RAM1_CATEGORIES):
pct = size / SRAM1_TOTAL * 100
kb = size / 1024
if i >= half:
lx2 = 420
else:
lx2 = 60
yy = 226 + (i % half) * 16
svg += f' <rect x="{lx2}" y="{yy}" width="12" height="12" fill="{color}" rx="2"/>\n'
svg += f' <text x="{lx2+16}" y="{yy+10}" class="legend-text" fill="#333">'
svg += f'主SRAM {label}: {kb:.1f}KB ({pct:.1f}%)</text>\n'
for i, (label, size, color) in enumerate(RAM2_CATEGORIES):
pct = size / CCM_TOTAL * 100
kb = size / 1024
yy = 322 + i * 16
svg += f' <rect x="{60}" y="{yy}" width="12" height="12" fill="{color}" rx="2"/>\n'
svg += f' <text x="{76}" y="{yy+10}" class="legend-text" fill="#333">'
svg += f'CCM {label}: {kb:.1f}KB ({pct:.1f}%)</text>\n'
svg += svg_footer()
return svg
def gen_flash_svg():
"""内存布局_FLASH.svg — bar + code sub-breakdown."""
W, H = 820, 240
BAR_X, BAR_Y, BAR_H = 60, 50, 40
SCALE = (W - 80) / FLASH_TOTAL
svg = svg_header(W, H)
svg += f'<text x="{W/2}" y="24" text-anchor="middle" class="title">Flash (1MB) 使用布局 — 2026-10-23 构建</text>\n'
x = BAR_X
for label, size, color in FLASH_CATEGORIES:
w = size * SCALE
if w < 1:
continue
inside = f"{label} {size/1024:.1f}KB" if w > 60 else ""
outside = "" if w > 60 else f"{label} {size/1024:.1f}KB"
svg += _draw_bar_segment(x, BAR_Y, w, BAR_H, color, inside, outside)
x += w
# Summary below bar
svg += f'<text x="{BAR_X}" y="{BAR_Y+BAR_H+18}" class="label" fill="#333">'
svg += f'已用: {FLASH_USED/1024:.1f}KB ({FLASH_USED/FLASH_TOTAL*100:.1f}%)'
svg += f' 空闲: {FLASH_FREE/1024:.1f}KB ({FLASH_FREE/FLASH_TOTAL*100:.1f}%)'
svg += f' ER_IROM1(Code+RO): {FLASH_IROM/1024:.1f}KB ({FLASH_IROM/FLASH_TOTAL*100:.1f}%)'
svg += f' 总量: 1MB (= ROM 合计口径)'
svg += f'</text>\n'
# Code sub-breakdown mini bar
Y2 = 130
svg += f'<text x="{BAR_X}" y="{Y2-6}" class="label" fill="#555">Code + RO 分布(ER_IROM1 {FLASH_IROM/1024:.1f}KB,按 .map 对象归类)</text>\n'
SCALE2 = (W - 80) / FLASH_IROM
x2 = BAR_X
for label, size, color in FLASH_CODE_SUB:
w = size * SCALE2
if w < 1:
continue
# 窄段(多数桶 < 40px)不放内嵌文字,统一列到下方图例,避免互相压字
inside = f"{size/1024:.1f}KB" if w > 40 else ""
svg += _draw_bar_segment(x2, Y2, w, 24, color, inside, "")
x2 += w
# 图例:四列三行(10 个桶)
for i, (label, size, color) in enumerate(FLASH_CODE_SUB):
col, row = i % 4, i // 4
lx = 60 + col * 195
ly = 176 + row * 16
svg += f' <rect x="{lx}" y="{ly-9}" width="10" height="10" fill="{color}" rx="2"/>\n'
svg += f' <text x="{lx+14}" y="{ly}" class="legend-text" fill="#333">{label} {size/1024:.1f}KB</text>\n'
svg += svg_footer()
return svg
def gen_taskstack_svg():
"""任务栈预算.svg — 每任务:分配栈条 + 最坏占用叠加条 + 实测余量/判定。"""
W, H = 880, 620 # 9 个任务 + 2 内核栈 + 堆汇总,行高 40 需要 ~600 高
BAR_X = 190
MAX_STACK = 16384
SCALE = (W - BAR_X - 40) / MAX_STACK
Y_START = 64
ROW_PITCH = 40
BAR_H = 16
svg = svg_header(W, H)
svg += f'<text x="{W/2}" y="22" text-anchor="middle" class="title">FreeRTOS 任务栈预算(9 任务;栈全部从 56KB FreeRTOS 堆分配,堆位于 CCM)</text>\n'
svg += f'<text x="{W/2}" y="40" text-anchor="middle" class="legend-text" fill="#777">数据: 2026-10-22 构建 + 同日真机 [STACK] 水位(data/stack_report_20261022.md);最坏 = max(静态最坏链, 实测峰值);判定线 = 余量 ≥ max(1024B ISR, 配置×30%)</text>\n'
svg += f'<text x="{BAR_X}" y="{Y_START-10}" class="legend-text" fill="#555">浅色条 = 分配栈 深色条 = 最坏占用(max(静态最坏, 实测峰值)) 下方文字 = 实测余量/判定</text>\n'
y = Y_START
for name, cfg, prio, worst, peak, margin, pct, verdict, desc in TASK_STACKS:
w = cfg * SCALE
wc = worst * SCALE
# 三档优先级配色:Normal 蓝 / BelowNormal 琥珀 / AboveNormal 绿(adcTask)
dark = {"Normal": "#2196F3", "BelowNormal": "#FF9800",
"AboveNormal": "#4CAF50"}[prio]
light = {"Normal": "#BBDEFB", "BelowNormal": "#FFE0B2",
"AboveNormal": "#C8E6C9"}[prio]
vc = "#2E7D32" if verdict == "PASS" else "#C62828"
# 任务名(左侧)
svg += f' <text x="{BAR_X-4}" y="{y+8}" text-anchor="end" dominant-baseline="central" class="label" fill="#333">{name}</text>\n'
# 分配栈条(浅色)+ 最坏占用叠加条(深色)
svg += f' <rect class="bar-seg" x="{BAR_X}" y="{y}" width="{w:.1f}" height="{BAR_H}" fill="{light}" rx="3"/>\n'
svg += f' <rect x="{BAR_X}" y="{y}" width="{wc:.1f}" height="{BAR_H}" fill="{dark}" rx="3"/>\n'
# 数据行
svg += f' <text x="{BAR_X}" y="{y+BAR_H+11}" dominant-baseline="central" class="legend-text" fill="#333">'
svg += f'配置 {cfg}B | 实测峰值 {peak}B | 最坏 {worst}B | 余量 {margin}B ({pct}%) '
svg += f'<tspan fill="{vc}" font-weight="bold">{verdict}</tspan></text>\n'
y += ROW_PITCH
# 内核任务(静态小栈,未取句柄实测)
y += 4
for name, stack in KERNEL_STACKS:
w = max(stack * SCALE, 2)
svg += f' <text x="{BAR_X-4}" y="{y+6}" text-anchor="end" dominant-baseline="central" class="label" fill="#333">{name}</text>\n'
svg += f' <rect class="bar-seg" x="{BAR_X}" y="{y}" width="{w:.1f}" height="12" fill="#90A4AE" rx="2"/>\n'
svg += f' <text x="{BAR_X + w + 4}" y="{y+6}" dominant-baseline="central" class="legend-text" fill="#333">{stack}B(未实测)</text>\n'
y += 22
# 堆汇总(实测值)
y += 8
svg += f'<text x="{BAR_X}" y="{y}" class="label" fill="#555">'
svg += f'堆总量: {HEAP_TOTAL}B(configTOTAL_HEAP_SIZE=56KB,位于 RW_CCM)'
svg += f' 任务栈合计: {TOTAL_STACKS}B(含 testTask 8192B)</text>\n'
y += 16
svg += f'<text x="{BAR_X}" y="{y}" class="label" fill="#555">'
svg += f'产品构建 8 任务栈 = 39168B + 内核栈 {512+1024}B'
svg += f' 实测: free={HEAP_FREE}B / min_ever={HEAP_MIN_EVER}B(2026-10-22)</text>\n'
y += 16
svg += f'<text x="{BAR_X}" y="{y}" class="label" fill="#555">'
svg += '判定: 9/9 PASS(testTask 无实测,取静态最坏链)</text>\n'
y += 24
# 颜色图例
svg += f' <rect x="{BAR_X}" y="{y}" width="10" height="10" fill="#2196F3" rx="2"/>\n'
svg += f' <text x="{BAR_X+14}" y="{y+8}" class="legend-text" fill="#333">Normal 优先级</text>\n'
svg += f' <rect x="{BAR_X+130}" y="{y}" width="10" height="10" fill="#FF9800" rx="2"/>\n'
svg += f' <text x="{BAR_X+144}" y="{y+8}" class="legend-text" fill="#333">BelowNormal 优先级</text>\n'
svg += f' <rect x="{BAR_X+300}" y="{y}" width="10" height="10" fill="#4CAF50" rx="2"/>\n'
svg += f' <text x="{BAR_X+314}" y="{y+8}" class="legend-text" fill="#333">AboveNormal 优先级(adcTask)</text>\n'
svg += f' <rect x="{BAR_X+520}" y="{y}" width="10" height="10" fill="#90A4AE" rx="2"/>\n'
svg += f' <text x="{BAR_X+534}" y="{y+8}" class="legend-text" fill="#333">内核栈 idle/timer</text>\n'
svg += svg_footer()
return svg
# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="Generate memory layout SVG diagrams")
parser.add_argument("--type", choices=["ram", "flash", "taskstack", "all"], default="all")
args = parser.parse_args()
out_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))),
"docs", "images")
os.makedirs(out_dir, exist_ok=True)
generators = {
"ram": ("内存布局_RAM.svg", gen_ram_svg),
"flash": ("内存布局_FLASH.svg", gen_flash_svg),
"taskstack": ("任务栈预算.svg", gen_taskstack_svg),
}
if args.type == "all":
targets = generators.values()
else:
targets = [generators[args.type]]
for filename, gen_func in targets:
path = os.path.join(out_dir, filename)
svg = gen_func()
with open(path, "w", encoding="utf-8", newline="\n") as f:
f.write(svg)
print(f"OK: {filename} ({len(svg)} bytes)")
# XML self-check
for filename, _ in targets:
path = os.path.join(out_dir, filename)
with open(path, "r", encoding="utf-8") as f:
content = f.read()
if not content.startswith("<svg "):
print(f"FAIL: {filename} does not start with <svg", file=sys.stderr)
sys.exit(1)
if "</svg>" not in content:
print(f"FAIL: {filename} missing </svg>", file=sys.stderr)
sys.exit(1)
if 'xmlns="http://www.w3.org/2000/svg"' not in content:
print(f"FAIL: {filename} missing xmlns", file=sys.stderr)
sys.exit(1)
print("All SVG self-checks passed")
if __name__ == "__main__":
main()