diff options
| -rw-r--r-- | erts/emulator/Makefile.in | 18 | ||||
| -rwxr-xr-x | erts/emulator/utils/beam_emu_vars | 122 |
2 files changed, 139 insertions, 1 deletions
diff --git a/erts/emulator/Makefile.in b/erts/emulator/Makefile.in index 02a9a9a93b..0cf8fee15d 100644 --- a/erts/emulator/Makefile.in +++ b/erts/emulator/Makefile.in @@ -499,7 +499,6 @@ ifeq ($(TARGET),win32) RELEASE_INCLUDES += sys/$(ERLANG_OSTYPE)/erl_win_dyn_driver.h endif - .PHONY: release_spec ifdef VOID_EMULATOR release_spec: @@ -711,16 +710,27 @@ $(OBJDIR)/beams.$(RES_EXT): $(TARGET)/beams.rc endif +# We disable the implicit rule of .S -> .o so that the verbose asm +# generate is not used for compiling erts. This is only a problem on +# old solaris make +%.o : %.S + # Usually the same as the default rule, but certain platforms (e.g. win32) mix # different compilers $(OBJDIR)/beam_emu.o: beam/beam_emu.c $(V_EMU_CC) $(subst -O2, $(GEN_OPT_FLGS), $(CFLAGS)) $(INCLUDES) -c $< -o $@ +$(OBJDIR)/beam_emu.S: beam/beam_emu.c + $(V_EMU_CC) -S -fverbose-asm $(subst -O2, $(GEN_OPT_FLGS), $(CFLAGS)) $(INCLUDES) -c $< -o $@ + $(OBJDIR)/%_pg.o: beam/%.c $(V_CC) $(PROFILE_GENERATE) $(subst -O2, $(GEN_OPT_FLGS), $(CFLAGS)) $(INCLUDES) -c $< -o $@ $(OBJDIR)/%_pu.o: beam/%.c $(PROFILE_USE_DEPS) $(V_CC) $(PROFILE_USE) $(subst -O2, $(GEN_OPT_FLGS), $(CFLAGS)) $(INCLUDES) -c $< -o $@ +$(OBJDIR)/%_pu.S: beam/%.c $(PROFILE_USE_DEPS) + $(V_CC) -S -fverbose-asm $(PROFILE_USE) $(subst -O2, $(GEN_OPT_FLGS), $(CFLAGS)) $(INCLUDES) -c $< -o $@ + $(OBJDIR)/PROFILE: $(BINDIR)/$(PROFILE_EXECUTABLE) $(V_at)echo " PROFILE ${PROFILE_EXECUTABLE}" $(V_at)rm -f $(OBJDIR)/erl*.profraw @@ -732,6 +742,8 @@ $(OBJDIR)/PROFILE: $(BINDIR)/$(PROFILE_EXECUTABLE) -noshell -s estone_SUITE pgo -s init stop >> $(OBJDIR)/PROFILE_LOG $(V_at)touch $@ +.SECONDARY: $(patsubst %.o,%_pu.gcda,$(PROFILE_OBJS)) + $(OBJDIR)/%_pu.gcda: $(OBJDIR)/PROFILE $(V_at)mv $(OBJDIR)/$*_pg.gcda $@ $(V_at)touch $@ @@ -1167,6 +1179,10 @@ DEP_FLAGS=-MM $(MG_FLAG) $(CFLAGS) $(INCLUDES) -Inifs/common -Idrivers/common -I SYS_SRC=$(ALL_SYS_SRC) endif +.PHONY: check_emu_registers +check_emu_registers: $(OBJDIR)/beam_emu$(PROFILE_MARKER).S + utils/beam_emu_vars -vars 'c_p E HTOP FCALLS I reg' $^ + .PHONY: $(TARGET)/gen_git_version.mk $(TARGET)/gen_git_version.mk: # We touch beam/erl_bif.info.c if we regenerated the git version to force a diff --git a/erts/emulator/utils/beam_emu_vars b/erts/emulator/utils/beam_emu_vars new file mode 100755 index 0000000000..c798a4dada --- /dev/null +++ b/erts/emulator/utils/beam_emu_vars @@ -0,0 +1,122 @@ +#!/usr/bin/perl -w +use strict; + +# Analyse beam_emu.s and try to find out the registers +# used for the important variables in process_main(). +# +# Works for .s files from clang or gcc. For gcc, the -fverbose-asm +# option must be used. +# +# Example: +# +# $ beam-emu-vars -vars 'c_p E HTOP FCALLS I reg freg' beam_emu.s +# E: %r13 +# FCALLS: %rcx:98 %rax:88 16(%rsp):50 %rdi:6 +# HTOP: %r10:382 64(%rsp):88 72(%rsp):9 24(%rsp):7 %rcx:6 %r15:6 80(%rsp):3 88(%rsp):2 +# I: %rbx +# c_p: %rbp +# freg: 48(%rsp):11 %rcx:8 %rdi:5 %rax:4 +# reg: %r12 +# +# That means that E, I, c_p, reg seems to be assigned to permanent registers. +# HTOP seems to be assigned %r10, but it is saved to a scratch location +# before any function calls. FCALLS and freg seems to be saved in a location on +# the stack and loaded into a register when used. +# +# The exit status will be 0 if all variables are assigned to registers (most of +# the time), and 1 if one or more variables are assigned to a stack location. + +my $vars = 'c_p E FCALLS freg HTOP I reg'; + +while (@ARGV and $ARGV[0] =~ /^-(.*)/) { + $_ = $1; + shift; + ($vars = shift), next if /^vars/; + die "$0: Bad option: -$_\n"; +} + +my @vars = split(" ", $vars); +my %vars; +@vars{@vars} = @vars; + +my $inside; +my %count; + +if (@ARGV != 1) { + usage(); +} + +while (<>) { + if (!$inside && /[.]globl\s*_?process_main/) { + $inside = 1; + } elsif ($inside && /[.]globl/) { + last; + } + if ($inside) { + if (/##DEBUG_VALUE:\s*process_main:([A-Za-z]*)\s*<-\s*(.*)/) { + # clang + my($var,$reg) = ($1,$2); + next if $reg =~ /^[-\d]+$/; # Ignore if number. + $count{$var}->{$reg}++ if $vars{$var}; + next; + } + + # Parse gcc verbose arguments. Comments are marked with + # one '#' (clang marks its comments with two '#'). + my($src,$dst,$comment) = /movq\s+([^#]+), ([^#]+)#(?!#)\s*(.*)/; + next unless $comment; + $dst =~ s/\s*$//; + my($vsrc,$vdst) = split /,/, $comment, 2; + $vdst =~ s/^\s//; + update_count(\%count, $vsrc, $src); + update_count(\%count, $vdst, $dst); + if ($vars{$vdst} and $vsrc eq '%sfp') { + $count{$vdst}->{$src}++; + } + } +} + +my @first; + +OUTER: +for my $var (sort keys %count) { + my $total = 0; + + foreach my $reg (keys %{$count{$var}}) { + $total += $count{$var}->{$reg}++; + } + + foreach my $reg (keys %{$count{$var}}) { + if ($count{$var}->{$reg} > 0.9*$total) { + print "$var: $reg\n"; + push @first, $var; + next OUTER; + } + } + + my @r; + foreach my $reg (keys %{$count{$var}}) { + push @r, $reg; + } + @r = sort { $count{$var}->{$b} <=> $count{$var}->{$a} } @r; + @r = map { "$_:$count{$var}->{$_}" } @r; + push @first, $r[0]; + print "$var: ", join(' ', @r), "\n"; +} + +foreach (@first) { + exit 1 if /%rsp/; +} +exit 0; + +sub update_count { + my($count_ref,$var,$reg) = @_; + return unless $vars{$var}; + ${${$count_ref}{$var}}{$reg}++; +} + +sub usage { + die qq[usage: beam_emu_vars [ -vars "var1 var2..." ] <filename>.s\n\n] . + "The exit status is 0 if all variables are assigned to registers,\n" . + "and 1 if one or more variables are allocated to a stack location.\n"; +} |