[clang][dataflow] Display line numbers in the HTML logger timeline.

[martinboehme]

This makes it easier to count how many iterations an analysis takes to complete.
It also makes it easier to compare how a change to the analysis code affects
the timeline.

Here's a sample screenshot:

[llvmbot]

@llvm/pr-subscribers-clang-analysis

@llvm/pr-subscribers-clang

Author: None (martinboehme)

Changes

This makes it easier to count how many iterations an analysis takes to complete.
It also makes it easier to compare how a change to the analysis code affects
the timeline.

---

Full diff: https://github.com/llvm/llvm-project/pull/80130.diff

2 Files Affected:

• (modified) clang/lib/Analysis/FlowSensitive/HTMLLogger.css (+10)
• (modified) clang/lib/Analysis/FlowSensitive/HTMLLogger.html (+1)

diff --git a/clang/lib/Analysis/FlowSensitive/HTMLLogger.css b/clang/lib/Analysis/FlowSensitive/HTMLLogger.css
index 5da8db8fa87bf..e25270430efc2 100644
--- a/clang/lib/Analysis/FlowSensitive/HTMLLogger.css
+++ b/clang/lib/Analysis/FlowSensitive/HTMLLogger.css
@@ -29,6 +29,16 @@ section h2 {
 }
 #timeline {
   min-width: max-content;
+  counter-reset: entry_counter;
+}
+#timeline .entry .counter::before {
+  counter-increment: entry_counter;
+  content: counter(entry_counter) ":";
+}
+#timeline .entry .counter {
+  display: inline-block;
+  min-width: 2em; /* Enough space for two digits and a colon */
+  text-align: right;
 }
 #timeline .entry.hover {
   background-color: #aaa;
diff --git a/clang/lib/Analysis/FlowSensitive/HTMLLogger.html b/clang/lib/Analysis/FlowSensitive/HTMLLogger.html
index b9f76c5074c75..be173e8b2854d 100644
--- a/clang/lib/Analysis/FlowSensitive/HTMLLogger.html
+++ b/clang/lib/Analysis/FlowSensitive/HTMLLogger.html
@@ -42,6 +42,7 @@
 <header>Timeline</header>
 <template data-for="entry in timeline">
   <div id="{{entry.block}}:{{entry.iter}}" data-bb="{{entry.block}}" class="entry">
+    <span class="counter"></span>
     {{entry.block}}
     <template data-if="entry.post_visit">(post-visit)</template>
     <template data-if="!entry.post_visit">({{entry.iter}})</template>

[martinboehme]

Failing check is a clang-format check for clang/docs/HIPSupport.rst, which this PR does not modify.