tree 7e07c96ed2ec870d5ac3455d523e8b9e29eaa22f
parent 5fe998e4a18cc1dbbd4869be5c8202bda55adb33
author Ian Lance Taylor <iant@golang.org> 1518039093 -0800
committer Ian Lance Taylor <iant@golang.org> 1518041046 +0000

runtime: don't call funcPC from a function

The escape analysis support is not yet good enough to avoid escaping
the argument to funcPC.  This causes unnecessary and often harmful
memory allocation.  E.g., (*cpuProfile).addExtra can be called from a
signal handler, and it must not allocate memory.

Move the calls to funcPC to use variables instead.  This was done in
the original migration to using funcPC, but was not done for newer code.

In one case, in signal handling code, use getSigtramp.

Change-Id: I5ad5db0a6750250b2c453d3a5a0a9dafdf53c82c
Reviewed-on: https://go-review.googlesource.com/92735
Reviewed-by: Cherry Zhang <cherryyz@google.com>