Render link time in pipeline graph

src/cargo/core/compiler/timings.js

@@ -67,6 +67,7 @@ const CANVAS_BG = getCssColor('--canvas-background');
 const AXES_COLOR = getCssColor('--canvas-axes');
 const GRID_COLOR = getCssColor('--canvas-grid');
 const CODEGEN_COLOR = getCssColor('--canvas-codegen');
+const LINK_COLOR = getCssColor('--canvas-link');
 const CUSTOM_BUILD_COLOR = getCssColor('--canvas-custom-build');
 const NOT_CUSTOM_BUILD_COLOR = getCssColor('--canvas-not-custom-build');
 const DEP_LINE_COLOR = getCssColor('--canvas-dep-line');
@@ -136,7 +137,19 @@ function render_pipeline_graph() {
     let x = px_per_sec * unit.start;
 
     const sections = [];
-    if (unit.rmeta_time != null) {
+    if (unit.sections !== null) {
+        // We have access to compilation sections
+        for (const section of unit.sections) {
+            const [name, {start, end}] = section;
+            sections.push({
+                name,
+                start: x + px_per_sec * start,
+                width: (end - start) * px_per_sec
+            });
+        }
+    }
+    else if (unit.rmeta_time != null) {
+        // We only know the rmeta time
         sections.push({
             name: "codegen",
             start: x + px_per_sec * unit.rmeta_time,
@@ -188,6 +201,8 @@ function render_pipeline_graph() {
 function get_section_color(name) {
     if (name === "codegen") {
         return CODEGEN_COLOR;
+    } else if (name === "link") {
+        return LINK_COLOR;
     } else {
         // We do not know what section this is, so just use the default color
         return NOT_CUSTOM_BUILD_COLOR;

src/cargo/core/compiler/timings.rs

@@ -586,6 +586,7 @@ impl<'gctx> Timings<'gctx> {
             rmeta_time: Option<f64>,
             unlocked_units: Vec<usize>,
             unlocked_rmeta_units: Vec<usize>,
+            sections: Option<Vec<(String, SectionData)>>,
         }
         let round = |x: f64| (x * 100.0).round() / 100.0;
         let unit_data: Vec<UnitData> = self
@@ -599,7 +600,6 @@ impl<'gctx> Timings<'gctx> {
                     "todo"
                 }
                 .to_string();
-
                 // These filter on the unlocked units because not all unlocked
                 // units are actually "built". For example, Doctest mode units
                 // don't actually generate artifacts.
@@ -613,6 +613,13 @@ impl<'gctx> Timings<'gctx> {
                     .iter()
                     .filter_map(|unit| unit_map.get(unit).copied())
                     .collect();
+                let aggregated = ut.aggregate_sections();
+                let sections = match aggregated {
+                    AggregatedSections::Sections(sections) => Some(sections),
+                    AggregatedSections::OnlyMetadataTime { .. }
+                    | AggregatedSections::OnlyTotalDuration => None,
+                };
+
                 UnitData {
                     i,
                     name: ut.unit.pkg.name().to_string(),
@@ -624,6 +631,7 @@ impl<'gctx> Timings<'gctx> {
                     rmeta_time: ut.rmeta_time.map(round),
                     unlocked_units,
                     unlocked_rmeta_units,
+                    sections,
                 }
             })
             .collect();
@@ -871,6 +879,7 @@ static HTML_TMPL: &str = r#"
   --canvas-axes: #303030;
   --canvas-grid: #e6e6e6;
   --canvas-codegen: #aa95e8;
+  --canvas-link: #95e8aa;
   --canvas-custom-build: #f0b165;
   --canvas-not-custom-build: #95cce8;
   --canvas-dep-line: #ddd;