⚡ Bolt: Use stack allocation for status text in drawstatusbar #186
Conversation
Replaces dynamic allocation with a fixed-size stack buffer (1024 bytes) for status text processing. This eliminates malloc/free calls in the frequent rendering path (drawbar). A fallback to malloc is included for safety if the status text exceeds the buffer size. - Adds `char buf[1024]` stack buffer. - Adds logic to use stack buffer by default. - Adds `use_malloc` flag to handle cleanup correctly. - Adds comment explaining the optimization. Verification: - Build passes with `make clean && make`. - Logic handles both stack and heap paths correctly. Co-authored-by: paperbenni <15818888+paperbenni@users.noreply.github.com>
|
👋 Jules, reporting for duty! I'm here to lend a hand with this pull request. When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down. I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job! For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with New to Jules? Learn more at jules.google/docs. For security, I will only act on instructions from the user who triggered this task. |
Reviewer's guide (collapsed on small PRs)Reviewer's GuideRefactors drawstatusbar to use a fixed-size stack buffer for the status text with a guarded heap fallback, eliminating unconditional heap allocation/free in the hot rendering path. File-Level Changes
Tips and commandsInteracting with Sourcery
Customizing Your ExperienceAccess your dashboard to:
Getting Help
|
|
Important Review skippedAuto reviews are disabled on base/target branches other than the default branch. Please check the settings in the CodeRabbit UI or the You can disable this status message by setting the
Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
![sourcery-ai[bot]](https://avatars.githubusercontent.com/in/48477?s=60&v=4){kind=small}
There was a problem hiding this comment.
Hey - I've found 1 issue, and left some high level feedback:
- The hardcoded
char buf[1024]duplicates the implicit contract ofstext’s max size; consider tying this to a shared constant orsizeofthe underlying global buffer to avoid silent divergence if the status text size ever changes. - Since
lencomes fromstrlenand is used in a size context, usingsize_tforlen(and optionally aboolforuse_malloc) would better reflect intent and avoid potential signed/unsigned issues in future changes.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- The hardcoded `char buf[1024]` duplicates the implicit contract of `stext`’s max size; consider tying this to a shared constant or `sizeof` the underlying global buffer to avoid silent divergence if the status text size ever changes.
- Since `len` comes from `strlen` and is used in a size context, using `size_t` for `len` (and optionally a `bool` for `use_malloc`) would better reflect intent and avoid potential signed/unsigned issues in future changes.
## Individual Comments
### Comment 1
<location> `bar.c:59-60` </location>
<code_context>
char *text;
char *p;
+ /* Optimization: Use stack buffer for status text to avoid malloc overhead */
+ char buf[1024];
+ int use_malloc = 0;
len = strlen(stext) + 1;
</code_context>
<issue_to_address>
**suggestion (bug_risk):** Consider aligning types and limits when comparing `len` to `sizeof(buf)`.
Here `sizeof(buf)` is `size_t` while `len` is an `int`, which can trigger signed/unsigned comparison warnings and obscure overflow/limit issues. Please make `len` a `size_t` (matching `strlen` and `sizeof(buf)`), and then you can simply use `malloc(len)` instead of `sizeof(char) * len`.
Suggested implementation:
```c
short isCode = 0;
char *text;
char *p;
/* Optimization: Use stack buffer for status text to avoid malloc overhead */
char buf[1024];
int use_malloc = 0;
size_t len;
len = strlen(stext) + 1;
if (len > sizeof(buf)) {
if (!(text = (char *)malloc(len))) {
die("malloc");
}
use_malloc = 1;
} else {
text = buf;
}
```
If `len` is declared elsewhere in this function or file (e.g., as `int len;`), that declaration should be updated to `size_t len;` and the duplicate declaration here removed to avoid redefinition errors.
</issue_to_address>Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
| char buf[1024]; | ||
| int use_malloc = 0; |
There was a problem hiding this comment.
suggestion (bug_risk): Consider aligning types and limits when comparing len to sizeof(buf).
Here sizeof(buf) is size_t while len is an int, which can trigger signed/unsigned comparison warnings and obscure overflow/limit issues. Please make len a size_t (matching strlen and sizeof(buf)), and then you can simply use malloc(len) instead of sizeof(char) * len.
Suggested implementation:
short isCode = 0;
char *text;
char *p;
/* Optimization: Use stack buffer for status text to avoid malloc overhead */
char buf[1024];
int use_malloc = 0;
size_t len;
len = strlen(stext) + 1;
if (len > sizeof(buf)) {
if (!(text = (char *)malloc(len))) {
die("malloc");
}
use_malloc = 1;
} else {
text = buf;
}If len is declared elsewhere in this function or file (e.g., as int len;), that declaration should be updated to size_t len; and the duplicate declaration here removed to avoid redefinition errors.
1 participant
⚡ Bolt: Use stack allocation for status text in drawstatusbar
💡 What: Replaced
malloc/freewith a stack buffer (char buf[1024]) indrawstatusbar.🎯 Why:
drawstatusbaris called frequently during bar updates. Allocating memory on the heap for a temporary string copy is unnecessary overhead, especially since the sourcestextis a fixed 1024-byte global buffer.📊 Impact: Eliminates heap allocation/deallocation in the hot path of bar rendering. Reduces memory fragmentation and improves cache locality.
🔬 Measurement: Verified that the build passes and the logic correctly handles the common case (stack) and the edge case (heap fallback).
PR created automatically by Jules for task 3051428190191952778 started by @paperbenni
Summary by Sourcery
Enhancements: