erts,hipe,dialyzer: Fix hipe checkum of target runtime system

Main problem:
A faulty HIPE_LITERAL_CRC was not detected by the loader.

Strangeness #1:
Dialyzer should ask the hipe compiler about the target checksum,
not an internal bif.

Strangeness #2:
The HIPE_SYSTEM_CRC checksum was based on the HIPE_LITERALS_CRC
checksum.

Solution:
New HIPE_ERTS_CHECKSUM which is an bxor of the two (now independent)
HIPE_LITERALS_CRC and HIPE_SYSTEM_CRC.

HIPE_LITERALS_CRC represents values that are assumed to stay constant
for different VM configurations of the same arch, and are therefor
hard coded into the hipe compiler.

HIPE_SYSTEM_CRC represents values that may differ between VM variants.
By default the hipe compiler asks the running VM for this checksum,
in order to create beam files for the same running VM.
The hipe compiler can be configured (with "make XCOMP=yes ...") to
create beam files for another VM variant, in which case HIPE_SYSTEM_CRC
is also hard coded.

ToDo:
Treat all erts properties the same. Either ask the running VM or hard
coded into hipe (if XCOMP=yes). This will simplify and reduce the risk
of dangerous mismatches. One concern might be the added overhead
from more frequent calls to hipe_bifs:get_rts_param.

6 files changed, 16 insertions, 6 deletions

diff --git a/lib/hipe/arm/hipe_arm_assemble.erl b/lib/hipe/arm/hipe_arm_assemble.erl
index 7859e2d4a8..5f98c6593e 100644
--- a/lib/hipe/arm/hipe_arm_assemble.erl
+++ b/lib/hipe/arm/hipe_arm_assemble.erl
@@ -48,7 +48,7 @@ assemble(CompiledCode, Closures, Exports, Options) ->
   DataRelocs = hipe_pack_constants:mk_data_relocs(RefsFromConsts, LabelMap),
   SSE = hipe_pack_constants:slim_sorted_exportmap(ExportMap,Closures,Exports),
   SlimRefs = hipe_pack_constants:slim_refs(AccRefs),
-  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_SYSTEM_CRC},
+  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_ERTS_CHECKSUM},
 			ConstAlign, ConstSize,
 			SC,
 			DataRelocs, % nee LM, LabelMap
diff --git a/lib/hipe/llvm/hipe_llvm_merge.erl b/lib/hipe/llvm/hipe_llvm_merge.erl
index 3ababfc21a..6e891ac3b0 100644
--- a/lib/hipe/llvm/hipe_llvm_merge.erl
+++ b/lib/hipe/llvm/hipe_llvm_merge.erl
@@ -27,7 +27,7 @@ finalize(CompiledCode, Closures, Exports) ->
   DataRelocs = hipe_pack_constants:mk_data_relocs(RefsFromConsts, LabelMap),
   SSE = hipe_pack_constants:slim_sorted_exportmap(ExportMap, Closures, Exports),
   SlimRefs = hipe_pack_constants:slim_refs(AccRefs),
-  term_to_binary([{?VERSION_STRING(),?HIPE_SYSTEM_CRC},
+  term_to_binary([{?VERSION_STRING(),?HIPE_ERTS_CHECKSUM},
 		  ConstAlign, ConstSize,
 		  SC,  % ConstMap
 		  DataRelocs, % LabelMap
diff --git a/lib/hipe/main/hipe.erl b/lib/hipe/main/hipe.erl
index ce4f49ffa7..1a4bbf179f 100644
--- a/lib/hipe/main/hipe.erl
+++ b/lib/hipe/main/hipe.erl
@@ -208,7 +208,8 @@
 	 help_options/0,
 	 help_option/1,
 	 help_debug_options/0,
-	 version/0]).
+	 version/0,
+	 erts_checksum/0]).
 
 -ifndef(DEBUG).
 -define(DEBUG,true).
@@ -216,6 +217,7 @@
 
 -include("hipe.hrl").
 -include("../../compiler/src/beam_disasm.hrl").
+-include("../rtl/hipe_literals.hrl").
 
 %%-------------------------------------------------------------------
 %% Basic type declaration for exported functions of the 'hipe' module
@@ -1032,6 +1034,12 @@ post(Res, Icode, Options) ->
 version() ->
   ?VERSION_STRING().
 
+%% @doc Returns checksum identifying the target runtime system.
+-spec erts_checksum() -> integer().
+
+erts_checksum() ->
+  ?HIPE_ERTS_CHECKSUM.
+
 %% --------------------------------------------------------------------
 %% D O C U M E N T A T I O N   -   H E L P 
 %% --------------------------------------------------------------------
@@ -1062,6 +1070,8 @@ help() ->
     "     Prints a description of debug options.\n" ++
     "   version() ->\n" ++
     "     Returns the HiPE version as a string'.\n" ++
+    "   erts_checksum() ->\n" ++
+    "     Returns a checksum identifying the target runtime system.\n" ++
     "\n" ++
     " For HiPE developers only:\n" ++
     "  Use `help_hiper()' for information about HiPE's low-level interface\n",
diff --git a/lib/hipe/ppc/hipe_ppc_assemble.erl b/lib/hipe/ppc/hipe_ppc_assemble.erl
index 4d419978ef..00f28d60e4 100644
--- a/lib/hipe/ppc/hipe_ppc_assemble.erl
+++ b/lib/hipe/ppc/hipe_ppc_assemble.erl
@@ -50,7 +50,7 @@ assemble(CompiledCode, Closures, Exports, Options) ->
   DataRelocs = hipe_pack_constants:mk_data_relocs(RefsFromConsts, LabelMap),
   SSE = hipe_pack_constants:slim_sorted_exportmap(ExportMap,Closures,Exports),
   SlimRefs = hipe_pack_constants:slim_refs(AccRefs),
-  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_SYSTEM_CRC},
+  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_ERTS_CHECKSUM},
 			ConstAlign, ConstSize,
 			SC,
 			DataRelocs, % nee LM, LabelMap
diff --git a/lib/hipe/sparc/hipe_sparc_assemble.erl b/lib/hipe/sparc/hipe_sparc_assemble.erl
index 5424a6c965..0e27c78416 100644
--- a/lib/hipe/sparc/hipe_sparc_assemble.erl
+++ b/lib/hipe/sparc/hipe_sparc_assemble.erl
@@ -49,7 +49,7 @@ assemble(CompiledCode, Closures, Exports, Options) ->
   DataRelocs = hipe_pack_constants:mk_data_relocs(RefsFromConsts, LabelMap),
   SSE = hipe_pack_constants:slim_sorted_exportmap(ExportMap,Closures,Exports),
   SlimRefs = hipe_pack_constants:slim_refs(AccRefs),
-  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_SYSTEM_CRC},
+  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_ERTS_CHECKSUM},
 			ConstAlign, ConstSize,
 			SC,
 			DataRelocs, % nee LM, LabelMap
diff --git a/lib/hipe/x86/hipe_x86_assemble.erl b/lib/hipe/x86/hipe_x86_assemble.erl
index 4ffa3d35ba..695ce16887 100644
--- a/lib/hipe/x86/hipe_x86_assemble.erl
+++ b/lib/hipe/x86/hipe_x86_assemble.erl
@@ -83,7 +83,7 @@ assemble(CompiledCode, Closures, Exports, Options) ->
   DataRelocs = hipe_pack_constants:mk_data_relocs(RefsFromConsts, LabelMap),
   SSE = hipe_pack_constants:slim_sorted_exportmap(ExportMap,Closures,Exports),
   SlimRefs = hipe_pack_constants:slim_refs(AccRefs),
-  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_SYSTEM_CRC},
+  Bin = term_to_binary([{?VERSION_STRING(),?HIPE_ERTS_CHECKSUM},
 			ConstAlign, ConstSize,
 			SC,
 			DataRelocs, % nee LM, LabelMap