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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
// +build !go1.7
package internal
import "runtime"
func (st StackTrace) frames() []stacktraceFrame {
fs := make([]stacktraceFrame, len(st))
for idx, pc := range st {
fs[idx] = lookupFrame(pc)
}
return fs
}
func lookupFrame(pc uintptr) stacktraceFrame {
// The Golang runtime package documentation says "To look up the file
// and line number of the call itself, use pc[i]-1. As an exception to
// this rule, if pc[i-1] corresponds to the function runtime.sigpanic,
// then pc[i] is the program counter of a faulting instruction and
// should be used without any subtraction."
//
// TODO: Fully understand when this subtraction is necessary.
place := pc - 1
f := runtime.FuncForPC(place)
if nil == f {
return stacktraceFrame{}
}
file, line := f.FileLine(place)
return stacktraceFrame{
Name: f.Name(),
File: file,
Line: int64(line),
}
}
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