Rewrite performed with this command:
sed -i '' 's_code.google.com/p/go\._golang.org/x/_g' \
$(grep -lr 'code.google.com/p/go.' *)
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/170920043
The previous implementation would cause the graph to contain
many duplicate edges resulting in very large cross products,
so that for some inputs (and random map iteration orders) the
running time of DeleteSyntheticNodes was many minutes---more
than the pointer analysis!
Duplicate edges can arise from an interface call that
dispatches to several different wrapper functions each
wrapping the same declared method.
For example, in the callgraph for go/types, a call to
Object.Pos() dispatches to the synthetic functions (*Type).Pos
and (*Var).Pos, each of which wrap (*object).Pos(). After
DeleteSyntheticNodes, Object.Pos() appeared to call
(*object).Pos() twice.
This change builds the set of all edges and avoids adding
edges already in the set.
Also, document findings.
LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/96100043
If a -pos argument is specified, a 'callgraph' query reports only the
functions within the query package. This produces a far more manageable
amount of information, and because we don't need to package-qualify the
names, the result is easier to read.
Added tests:
- callgraph query with/without -pos
(The test driver was extended to allow "nopos" queries.)
- callers and callees queries don't return wrappers
Also, in go/callgraph:
- (*Node).String, (*Edge).String
- (*Graph).DeleteSyntheticNodes eliminates synthetic wrapper functions,
preserving topology. Used in all four oracle "call*" queries.
- (*Graph).DeleteNode
LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/66240044
1) We remove context sensitivity from API. The pointer analysis is
not sufficiently context-sensitive for the context information to
be worth exposing. (The actual analysis precision still benefits
from being context-sensitive, though.) Since all clients would
discard the context info, we now do that for them.
2) Make the graph doubly-linked. Edges are now shared by the Nodes
at both ends of the edge so it's possible to navigate more easily
(e.g. to the callers).
3) Graph and Node are now concrete, not interfaces.
Less code in every file!
LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/66460043
Was: Now:
call.Graph callgraph.Graph
call.GraphNode callgraph.Node
call.Edge callgraph.Edge
Though call.Graph was cute, the original naming was a mistake:
'call' is too useful a var name to waste on a package.
R=gri, crawshaw
CC=golang-codereviews
https://golang.org/cl/53190043
Andrew Gerrand
Alan Donovan