Mark inlined frames as such in the traces report. (#510)

internal/driver/driver_test.go

 		{"tags", "heap"},
 		{"tags,unit=bytes", "heap"},
 		{"traces", "cpu"},
+		{"traces,addresses", "cpu"},
 		{"traces", "heap_tags"},
 		{"dot,alloc_space,flat,focus=[234]00", "heap_alloc"},
 		{"dot,alloc_space,flat,tagshow=[2]00", "heap_alloc"},

internal/driver/testdata/pprof.cpu.addresses.traces

+File: testbinary
+Type: cpu
+Duration: 10s, Total samples = 1.12s (11.20%)
+-----------+-------------------------------------------------------
+      key1:  tag1
+      key2:  tag1
+        1s   0000000000001000 line1000 testdata/file1000.src:1
+             0000000000002000 line2001 testdata/file2000.src:9 (inline)
+             0000000000002000 line2000 testdata/file2000.src:4
+             0000000000003000 line3002 testdata/file3000.src:2 (inline)
+             0000000000003000 line3001 testdata/file3000.src:5 (inline)
+             0000000000003000 line3000 testdata/file3000.src:6
+-----------+-------------------------------------------------------
+      key1:  tag2
+      key3:  tag2
+     100ms   0000000000001000 line1000 testdata/file1000.src:1
+             0000000000003001 line3001 testdata/file3000.src:8 (inline)
+             0000000000003001 line3000 testdata/file3000.src:9
+-----------+-------------------------------------------------------
+      key1:  tag3
+      key2:  tag2
+      10ms   0000000000002000 line2001 testdata/file2000.src:9 (inline)
+             0000000000002000 line2000 testdata/file2000.src:4
+             0000000000003002 line3002 testdata/file3000.src:5 (inline)
+             0000000000003002 line3000 testdata/file3000.src:9
+-----------+-------------------------------------------------------
+      key1:  tag4
+      key2:  tag1
+      10ms   0000000000003000 line3002 testdata/file3000.src:2 (inline)
+             0000000000003000 line3001 testdata/file3000.src:5 (inline)
+             0000000000003000 line3000 testdata/file3000.src:6
+-----------+-------------------------------------------------------

internal/driver/testdata/pprof.cpu.traces

       key1:  tag1
       key2:  tag1
         1s   line1000
-             line2001
+             line2001 (inline)
              line2000
-             line3002
-             line3001
+             line3002 (inline)
+             line3001 (inline)
              line3000
 -----------+-------------------------------------------------------
       key1:  tag2
       key3:  tag2
      100ms   line1000
-             line3001
+             line3001 (inline)
              line3000
 -----------+-------------------------------------------------------
       key1:  tag3
       key2:  tag2
-      10ms   line2001
+      10ms   line2001 (inline)
              line2000
-             line3002
+             line3002 (inline)
              line3000
 -----------+-------------------------------------------------------
       key1:  tag4
       key2:  tag1
-      10ms   line3002
-             line3001
+      10ms   line3002 (inline)
+             line3001 (inline)
              line3000
 -----------+-------------------------------------------------------

internal/driver/testdata/pprof.heap_tags.traces

      bytes:  100kB
    request:  100kB
     1000kB   line1000
-             line2001
+             line2001 (inline)
              line2000
-             line3002
-             line3001
+             line3002 (inline)
+             line3001 (inline)
              line3000
 -----------+-------------------------------------------------------
      bytes:  200kB
     3.91MB   line1000
-             line3001
+             line3001 (inline)
              line3000
 -----------+-------------------------------------------------------
       key1:  tag
      bytes:  1.56MB
    request:  1.56MB
-   62.50MB   line2001
+   62.50MB   line2001 (inline)
              line2000
-             line3002
+             line3002 (inline)
              line3000
 -----------+-------------------------------------------------------
      bytes:  400kB
-   31.25MB   line3002
-             line3001
+   31.25MB   line3002 (inline)
+             line3001 (inline)
              line3000
 -----------+-------------------------------------------------------

internal/report/report.go

 
 	_, locations := graph.CreateNodes(prof, &graph.Options{})
 	for _, sample := range prof.Sample {
-		var stack graph.Nodes
+		type stk struct {
+			*graph.NodeInfo
+			inline bool
+		}
+		var stack []stk
 		for _, loc := range sample.Location {
-			id := loc.ID
-			stack = append(stack, locations[id]...)
+			nodes := locations[loc.ID]
+			for i, n := range nodes {
+				// The inline flag may be inaccurate if 'show' or 'hide' filter is
+				// used. See https://github.com/google/pprof/issues/511.
+				inline := i != len(nodes)-1
+				stack = append(stack, stk{&n.Info, inline})
+			}
 		}
 
 		if len(stack) == 0 {
 		if d != 0 {
 			v = v / d
 		}
-		fmt.Fprintf(w, "%10s   %s\n",
-			rpt.formatValue(v), stack[0].Info.PrintableName())
-		for _, s := range stack[1:] {
-			fmt.Fprintf(w, "%10s   %s\n", "", s.Info.PrintableName())
+		for i, s := range stack {
+			var vs, inline string
+			if i == 0 {
+				vs = rpt.formatValue(v)
+			}
+			if s.inline {
+				inline = " (inline)"
+			}
+			fmt.Fprintf(w, "%10s   %s%s\n", vs, s.PrintableName(), inline)
 		}
 	}
 	fmt.Fprintln(w, separator)