coroc: make callgraph construction algorithm configurable #136
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The
x/tools/go/callgraphpackage has four algorithms for constructing callgraphs. We're currently hard-coded to use VTA.This PR makes the algorithm configurable when using
coroc, via a new-callgraph {static|cha|vta|rta}option. Thecallgraphtool (source) was helpful in determining how to use the construction algorithms.I've also added a
-colorsflag that enables debug output of the function coloring pass. It shows the roots (thecoroutine.Yieldfunctions, along with their type/color), and all edges that are followed in the coloring pass. It can be used to debug cases where a callgraph algorithm misses an edge, or where a function has more than one color.