https://github.com/Nerixyz created
https://github.com/llvm/llvm-project/pull/140139
The formatter extraction would look at too much data for one type.
This PR limits the size of the `DataExtractor` to the one specified in the
record size before - previously, the whole section was looked at.
Similarly, `ForEachFormatterInModule` skipped zero-bytes but didn't stop when
reaching the end of the extractor.
I hit both cases in an even smaller test than the one currently in the repo,
but I tried this on Windows[^1]. In my executable, the formatter section
started with my specified formatter and was padded to 512 bytes with zeroes.
I'd guess this should've come up in the existing test case, so macOS might do
something different here[?].
<details><summary>Test File</summary>
```c
struct Point {
int x;
int y;
};
__attribute__((used, section(".lldbformatters"))) const char my_string[] = {
0x01, // version
0x12, // record size
0x05, // type size
'P', 'o', 'i', 'n', 't',
0x00, // flags
0x00, // signature
0x09, // byte-code length
0x01, // drop
0x22, // push str
0x05, // str len
'A', 'A', 'A', 'A', 'A',
0x13, // return
};
int main() {
Point a{3, 4};
return a.x + a.y; // break here
}
```
</details>
[^1]: I had to change the section name matching to use an 8 byte name in the
[PE/COFF](https://github.com/llvm/llvm-project/blob/acdba28e148ac1e94d6c041f9911230e1e90e9cd/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp#L1003)
reader, since executables on Windows [can't have section names longer than 8
bytes](https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#section-table-section-headers)
(actually they can, and in MinGW they do, but I couldn't get `clang-cl` to
generate such a binary).
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Security-Policy" content="default-src 'none';
base-uri 'self'; connect-src 'self'; form-action 'self'; img-src 'self' data:;
script-src 'self'; style-src 'unsafe-inline'">
<meta content="origin" name="referrer">
<title>Rate limit · GitHub</title>
<meta name="viewport" content="width=device-width">
<style type="text/css" media="screen">
body {
background-color: #f6f8fa;
color: #24292e;
font-family: -apple-system,BlinkMacSystemFont,Segoe
UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol;
font-size: 14px;
line-height: 1.5;
margin: 0;
}
.container { margin: 50px auto; max-width: 600px; text-align: center;
padding: 0 24px; }
a { color: #0366d6; text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { line-height: 60px; font-size: 48px; font-weight: 300; margin: 0px;
text-shadow: 0 1px 0 #fff; }
p { color: rgba(0, 0, 0, 0.5); margin: 20px 0 40px; }
ul { list-style: none; margin: 25px 0; padding: 0; }
li { display: table-cell; font-weight: bold; width: 1%; }
.logo { display: inline-block; margin-top: 35px; }
.logo-img-2x { display: none; }
@media
only screen and (-webkit-min-device-pixel-ratio: 2),
only screen and ( min--moz-device-pixel-ratio: 2),
only screen and ( -o-min-device-pixel-ratio: 2/1),
only screen and ( min-device-pixel-ratio: 2),
only screen and ( min-resolution: 192dpi),
only screen and ( min-resolution: 2dppx) {
.logo-img-1x { display: none; }
.logo-img-2x { display: inline-block; }
}
#suggestions {
margin-top: 35px;
color: #ccc;
}
#suggestions a {
color: #666666;
font-weight: 200;
font-size: 14px;
margin: 0 10px;
}
</style>
</head>
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