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traces.go (1232B)

      1 // Copyright 2022 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package traces
      6 
      7 import (
      8 	"golang.org/x/vuln/internal/govulncheck"
      9 )
     10 
     11 // Compact returns a summarization of finding.Trace. The first
     12 // returned element is the vulnerable symbol and the last element
     13 // is the exit point of the user module. There can also be two
     14 // elements in between, if applicable, which are the two elements
     15 // preceding the user module exit point.
     16 func Compact(finding *govulncheck.Finding) []*govulncheck.Frame {
     17 	if len(finding.Trace) < 1 {
     18 		return nil
     19 	}
     20 	iTop := len(finding.Trace) - 1
     21 	topModule := finding.Trace[iTop].Module
     22 	// search for the exit point of the top module
     23 	for i, frame := range finding.Trace {
     24 		if frame.Module == topModule {
     25 			iTop = i
     26 			break
     27 		}
     28 	}
     29 
     30 	if iTop == 0 {
     31 		// all in one module, reset to the end
     32 		iTop = len(finding.Trace) - 1
     33 	}
     34 
     35 	compact := []*govulncheck.Frame{finding.Trace[0]}
     36 	if iTop > 1 {
     37 		if iTop > 2 {
     38 			compact = append(compact, finding.Trace[iTop-2])
     39 		}
     40 		compact = append(compact, finding.Trace[iTop-1])
     41 	}
     42 	if iTop > 0 {
     43 		compact = append(compact, finding.Trace[iTop])
     44 	}
     45 	return compact
     46 }