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cmd/gc: do not generate dead value maps yet

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We are not clearing dead values in the garbage collector so it
is not worth the RSS cost to materialize the data and write it
out to the binary.

R=golang-dev, iant, cshapiro
CC=golang-dev
https://golang.org/cl/38650043
This commit is contained in:
Carl Shapiro 2013-12-06 15:49:47 -08:00
parent d4f68f2892
commit 6965a752a7
1 changed files with 9 additions and 1 deletions
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10
src/cmd/gc/pgen.c
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@ -153,7 +153,15 @@ compile(Node *fn)
gcargs = makefuncdatasym("gcargs·%d", FUNCDATA_ArgsPointerMaps);
gclocals = makefuncdatasym("gclocals·%d", FUNCDATA_LocalsPointerMaps);
gcdead = makefuncdatasym("gcdead·%d", FUNCDATA_DeadPointerMaps);
// TODO(cshapiro): emit the dead value map when the garbage collector
// pre-verification pass is checked in. It is otherwise harmless to
// emit this information if it is not used but it does cost RSS at
// compile time. At present, the amount of additional RSS is
// substantial enough to affect our smallest build machines.
if(0)
gcdead = makefuncdatasym("gcdead·%d", FUNCDATA_DeadPointerMaps);
else
gcdead = nil;
for(t=curfn->paramfld; t; t=t->down)
gtrack(tracksym(t->type));