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cmd/compile: add clobberdeadreg mode

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When -clobberdeadreg flag is set, the compiler inserts code that
clobbers integer registers at call sites. This may be helpful for
debugging register ABI.

Only implemented on AMD64 for now.

Change-Id: Ia203d3f891c30fd95d0103489056fe01d63a2899
Reviewed-on: https://go-review.googlesource.com/c/go/+/302809
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2021-03-17 19:15:38 -04:00
parent 9f2a71b6e7
commit 6ae3b70ef2
17 changed files with 103 additions and 8 deletions
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1
src/cmd/compile/internal/base/flag.go
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@ -90,6 +90,7 @@ type CmdFlags struct {
CPUProfile string "help:\"write cpu profile to `file`\""
Complete bool "help:\"compiling complete package (no C or assembly)\""
ClobberDead bool "help:\"clobber dead stack slots (for debugging)\""
ClobberDeadReg bool "help:\"clobber dead registers (for debugging)\""
Dwarf bool "help:\"generate DWARF symbols\""
DwarfBASEntries *bool "help:\"use base address selection entries in DWARF\"" // &Ctxt.UseBASEntries, set below
DwarfLocationLists *bool "help:\"add location lists to DWARF in optimized mode\"" // &Ctxt.Flag_locationlists, set below