Bindings for the verifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42707 91177308-0d34-0410-b5e6-96231b3b80d8

13 files changed, 300 insertions, 24 deletions

diff --git a/Xcode/LLVM.xcodeproj/project.pbxproj b/Xcode/LLVM.xcodeproj/project.pbxproj
index a195dbda59..97f7328661 100644
--- a/Xcode/LLVM.xcodeproj/project.pbxproj
+++ b/Xcode/LLVM.xcodeproj/project.pbxproj
@@ -137,6 +137,11 @@
 		9F7794870C73D51000551F9C /* LLVMBuilder.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = LLVMBuilder.h; sourceTree = "<group>"; };
 		9F7794880C73D51000551F9C /* MemoryBuffer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MemoryBuffer.h; sourceTree = "<group>"; };
 		9F7794890C73D51000551F9C /* Streams.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Streams.h; sourceTree = "<group>"; };
+		9F7C23E50CB81C2100498408 /* Analysis.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Analysis.h; sourceTree = "<group>"; };
+		9F7C23E60CB81C2B00498408 /* Analysis.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Analysis.cpp; sourceTree = "<group>"; };
+		9F7C240C0CB81ECD00498408 /* analysis_ocaml.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = analysis_ocaml.c; sourceTree = "<group>"; };
+		9F7C240D0CB81ECD00498408 /* llvm_analysis.ml */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = llvm_analysis.ml; sourceTree = "<group>"; };
+		9F7C240E0CB81ECD00498408 /* llvm_analysis.mli */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = llvm_analysis.mli; sourceTree = "<group>"; };
 		9FA638D90C77B184007F12AE /* AutoUpgrade.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = AutoUpgrade.h; sourceTree = "<group>"; };
 		9FA638DA0C77B184007F12AE /* GlobalAlias.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = GlobalAlias.h; sourceTree = "<group>"; };
 		9FA638DB0C77B1AB007F12AE /* APInt.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = APInt.h; sourceTree = "<group>"; };
@@ -166,7 +171,6 @@
 		9FE25D900CAB166D005383FC /* APFloat.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = APFloat.h; sourceTree = "<group>"; };
 		9FE25D910CAB166D005383FC /* SparseBitVector.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SparseBitVector.h; sourceTree = "<group>"; };
 		9FE25D920CAB169F005383FC /* RegisterCoalescer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RegisterCoalescer.h; sourceTree = "<group>"; };
-		9FE25D930CAB16D8005383FC /* PostDominatorCalculation.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PostDominatorCalculation.h; sourceTree = "<group>"; };
 		9FE25D940CAB16FB005383FC /* RegisterCoalescer.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = RegisterCoalescer.cpp; sourceTree = "<group>"; };
 		9FE25D950CAB1724005383FC /* APFloat.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = APFloat.cpp; sourceTree = "<group>"; };
 		9FE25D960CAB1759005383FC /* TargetCallingConv.td */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = TargetCallingConv.td; sourceTree = "<group>"; };
@@ -1156,6 +1160,16 @@
 			path = MSIL;
 			sourceTree = "<group>";
 		};
+		9F7C240B0CB81ECD00498408 /* analysis */ = {
+			isa = PBXGroup;
+			children = (
+				9F7C240C0CB81ECD00498408 /* analysis_ocaml.c */,
+				9F7C240D0CB81ECD00498408 /* llvm_analysis.ml */,
+				9F7C240E0CB81ECD00498408 /* llvm_analysis.mli */,
+			);
+			path = analysis;
+			sourceTree = "<group>";
+		};
 		9FA638E90C77B252007F12AE /* IPO */ = {
 			isa = PBXGroup;
 			children = (
@@ -1176,6 +1190,7 @@
 		9FD3E56F0CA0116100E54D15 /* ocaml */ = {
 			isa = PBXGroup;
 			children = (
+				9F7C240B0CB81ECD00498408 /* analysis */,
 				9FD3E5700CA0116100E54D15 /* bitwriter */,
 				9FD3E57A0CA0116100E54D15 /* llvm */,
 			);
@@ -1217,6 +1232,7 @@
 		CF8F1B480B64F7AB00BB4199 /* include/llvm-c */ = {
 			isa = PBXGroup;
 			children = (
+				9F7C23E50CB81C2100498408 /* Analysis.h */,
 				9FD3E58D0CA0125F00E54D15 /* BitWriter.h */,
 				9FD3E58E0CA0125F00E54D15 /* Core.h */,
 				CF8F1B490B64F7AB00BB4199 /* LinkTimeOptimizer.h */,
@@ -1381,15 +1397,13 @@
 		DE66ECBD08ABEC0700323D32 /* lib/Analysis */ = {
 			isa = PBXGroup;
 			children = (
-				9FE25D930CAB16D8005383FC /* PostDominatorCalculation.h */,
-				9F68EB010C77AD02004AA152 /* LoopPass.cpp */,
-				9F68EB020C77AD02004AA152 /* MemoryDependenceAnalysis.cpp */,
 				DE66ED1A08ABEC0800323D32 /* IPA */,
 				DE66ECBE08ABEC0700323D32 /* AliasAnalysis.cpp */,
 				DE66ECBF08ABEC0700323D32 /* AliasAnalysisCounter.cpp */,
 				DE66ECC008ABEC0700323D32 /* AliasAnalysisEvaluator.cpp */,
 				CF8F1B4D0B64F80700BB4199 /* AliasDebugger.cpp */,
 				DE66ECC108ABEC0700323D32 /* AliasSetTracker.cpp */,
+				9F7C23E60CB81C2B00498408 /* Analysis.cpp */,
 				DE66ECC208ABEC0700323D32 /* BasicAliasAnalysis.cpp */,
 				DE66ECC308ABEC0700323D32 /* CFGPrinter.cpp */,
 				CF73C0B0098A523C00627152 /* ConstantFolding.cpp */,
@@ -1398,6 +1412,8 @@
 				DE66ED1908ABEC0800323D32 /* IntervalPartition.cpp */,
 				DE66ED3308ABEC0800323D32 /* LoadValueNumbering.cpp */,
 				DE66ED3408ABEC0800323D32 /* LoopInfo.cpp */,
+				9F68EB010C77AD02004AA152 /* LoopPass.cpp */,
+				9F68EB020C77AD02004AA152 /* MemoryDependenceAnalysis.cpp */,
 				DE66ED3608ABEC0800323D32 /* PostDominators.cpp */,
 				DE66ED3708ABEC0800323D32 /* ProfileInfo.cpp */,
 				DE66ED3808ABEC0800323D32 /* ProfileInfoLoader.cpp */,
diff --git a/bindings/ocaml/Makefile b/bindings/ocaml/Makefile
index 0fc6b1b6ee..a3bbae0094 100644
--- a/bindings/ocaml/Makefile
+++ b/bindings/ocaml/Makefile
@@ -8,6 +8,6 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL := ../..
-DIRS = llvm bitwriter
+DIRS = llvm bitwriter analysis
 
 include $(LEVEL)/Makefile.common
diff --git a/bindings/ocaml/Makefile.ocaml b/bindings/ocaml/Makefile.ocaml
index 278b31ea32..fb03b1a3e2 100644
--- a/bindings/ocaml/Makefile.ocaml
+++ b/bindings/ocaml/Makefile.ocaml
@@ -10,6 +10,11 @@
 # An ocaml library is a unique project type in the context of LLVM, so rules are
 # here rather than in Makefile.rules.
 # 
+# Reference materials on installing ocaml libraries:
+# 
+#   https://fedoraproject.org/wiki/Packaging/OCaml
+#   http://pkg-ocaml-maint.alioth.debian.org/ocaml_packaging_policy.txt
+# 
 ##===----------------------------------------------------------------------===##
 
 include $(LEVEL)/Makefile.config
@@ -188,7 +193,6 @@ install-cma:: $(OutputCMA)
 	$(Verb) $(MKDIR) $(PROJ_libocamldir)
 	$(Verb) $(DataInstall) $(OutputCMA) "$(DestCMA)"
 	$(Verb) for i in $(UsedLibNames); do \
-	  $(EchoCmd) "Installing $(BuildMode) $(PROJ_libocamldir)/$$i"; \
 	  ln -sf "$(PROJ_libdir)/$$i" "$(PROJ_libocamldir)/$$i"; \
 	done
 
@@ -196,7 +200,6 @@ uninstall-cma::
 	$(Echo) "Uninstalling $(DestCMA)"
 	-$(Verb) $(RM) -f $(DestCMA)
 	$(Verb) for i in $(UsedLibNames); do \
-	  $(EchoCmd) "Uninstalling $(PROJ_libocamldir)/$$i"; \
 	  $(RM) -f "$(PROJ_libocamldir)/$$i"; \
 	done
 
diff --git a/bindings/ocaml/analysis/Makefile b/bindings/ocaml/analysis/Makefile
new file mode 100644
index 0000000000..e910043f53
--- /dev/null
+++ b/bindings/ocaml/analysis/Makefile
@@ -0,0 +1,20 @@
+##===- bindings/ocaml/analysis/Makefile --------------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file was developed by Gordon Henriksen and is distributed under the
+# University of Illinois Open Source License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+# 
+# This is the makefile for the Objective Caml Llvm_analysis interface.
+# 
+##===----------------------------------------------------------------------===##
+
+LEVEL := ../../..
+LIBRARYNAME := llvm_analysis
+DONT_BUILD_RELINKED := 1
+UsedComponents := analysis
+UsedOcamlInterfaces := llvm
+
+include ../Makefile.ocaml
diff --git a/bindings/ocaml/analysis/analysis_ocaml.c b/bindings/ocaml/analysis/analysis_ocaml.c
new file mode 100644
index 0000000000..cc1098a374
--- /dev/null
+++ b/bindings/ocaml/analysis/analysis_ocaml.c
@@ -0,0 +1,60 @@
+/*===-- analysis_ocaml.c - LLVM Ocaml Glue ----------------------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file was developed by Gordon Henriksen and is distributed under the   *|
+|* University of Illinois Open Source License. See LICENSE.TXT for details.   *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This file glues LLVM's ocaml interface to its C interface. These functions *|
+|* are by and large transparent wrappers to the corresponding C functions.    *|
+|*                                                                            *|
+|* Note that these functions intentionally take liberties with the CAMLparamX *|
+|* macros, since most of the parameters are not GC heap objects.              *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#include "llvm-c/Analysis.h"
+#include "caml/alloc.h"
+#include "caml/mlvalues.h"
+#include "caml/memory.h"
+
+
+/* Llvm.llmodule -> string option */
+CAMLprim value llvm_verify_module(LLVMModuleRef M) {
+  CAMLparam0();
+  CAMLlocal2(String, Option);
+  
+  char *Message;
+  int Result = LLVMVerifyModule(M, LLVMReturnStatusAction, &Message);
+  
+  if (0 == Result) {
+    Option = Val_int(0);
+  } else {
+    Option = alloc(1, 1);
+    String = copy_string(Message);
+    Store_field(Option, 0, String);
+  }
+  
+  LLVMDisposeVerifierMessage(Message);
+  
+  CAMLreturn(Option);
+}
+
+/* Llvm.llvalue -> bool */
+CAMLprim value llvm_verify_function(LLVMValueRef Fn) {
+  return Val_bool(LLVMVerifyFunction(Fn, LLVMReturnStatusAction) == 0);
+}
+
+/* Llvm.llmodule -> unit */
+CAMLprim value llvm_assert_valid_module(LLVMModuleRef M) {
+  LLVMVerifyModule(M, LLVMAbortProcessAction, 0);
+  return Val_unit;
+}
+
+/* Llvm.llvalue -> unit */
+CAMLprim value llvm_assert_valid_function(LLVMValueRef Fn) {
+  LLVMVerifyFunction(Fn, LLVMAbortProcessAction);
+  return Val_unit;
+}
diff --git a/bindings/ocaml/analysis/llvm_analysis.ml b/bindings/ocaml/analysis/llvm_analysis.ml
new file mode 100644
index 0000000000..a972aa0856
--- /dev/null
+++ b/bindings/ocaml/analysis/llvm_analysis.ml
@@ -0,0 +1,24 @@
+(*===-- llvm_analysis.ml - LLVM Ocaml Interface -----------------*- C++ -*-===*
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file was developed by Gordon Henriksen and is distributed under the
+ * University of Illinois Open Source License. See LICENSE.TXT for details.
+ *
+ *===----------------------------------------------------------------------===
+ *
+ * This interface provides an ocaml API for LLVM IR analyses, the classes in
+ * the Analysis library.
+ *
+ *===----------------------------------------------------------------------===*)
+
+
+external verify_module : Llvm.llmodule -> string option = "llvm_verify_module"
+
+external verify_function : Llvm.llvalue -> bool = "llvm_verify_function"
+
+external assert_valid_module : Llvm.llmodule -> unit
+                             = "llvm_assert_valid_module"
+
+external assert_valid_function : Llvm.llvalue -> unit
+                               = "llvm_assert_valid_function"
diff --git a/bindings/ocaml/analysis/llvm_analysis.mli b/bindings/ocaml/analysis/llvm_analysis.mli
new file mode 100644
index 0000000000..59ff6c661c
--- /dev/null
+++ b/bindings/ocaml/analysis/llvm_analysis.mli
@@ -0,0 +1,24 @@
+(*===-- llvm_analysis.mli - LLVM Ocaml Interface ----------------*- C++ -*-===*
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file was developed by Gordon Henriksen and is distributed under the
+ * University of Illinois Open Source License. See LICENSE.TXT for details.
+ *
+ *===----------------------------------------------------------------------===
+ *
+ * This interface provides an ocaml API for LLVM IR analyses, the classes in
+ * the Analysis library.
+ *
+ *===----------------------------------------------------------------------===*)
+
+
+external verify_module : Llvm.llmodule -> string option = "llvm_verify_module"
+
+external verify_function : Llvm.llvalue -> bool = "llvm_verify_function"
+
+external assert_valid_module : Llvm.llmodule -> unit
+                             = "llvm_assert_valid_module"
+
+external assert_valid_function : Llvm.llvalue -> unit
+                               = "llvm_assert_valid_function"
diff --git a/bindings/ocaml/bitwriter/Makefile b/bindings/ocaml/bitwriter/Makefile
index 953ab4c082..e7d2f7fcf5 100644
--- a/bindings/ocaml/bitwriter/Makefile
+++ b/bindings/ocaml/bitwriter/Makefile
@@ -1,17 +1,13 @@
-##===- bindings/ocaml/llvm/Makefile ------------------------*- Makefile -*-===##
+##===- bindings/ocaml/bitwriter/Makefile -------------------*- Makefile -*-===##
 # 
 #                     The LLVM Compiler Infrastructure
 #
-# This file was developed by the LLVM research group and is distributed under
-# the University of Illinois Open Source License. See LICENSE.TXT for details.
+# This file was developed by Gordon Henriksen and is distributed under the
+# University of Illinois Open Source License. See LICENSE.TXT for details.
 # 
 ##===----------------------------------------------------------------------===##
 # 
-# This is the makefile for the llvm-ml interface. Reference materials on
-# installing ocaml libraries:
-# 
-#   https://fedoraproject.org/wiki/Packaging/OCaml
-#   http://pkg-ocaml-maint.alioth.debian.org/ocaml_packaging_policy.txt
+# This is the makefile for the Objective Caml Llvm_bitwriter interface.
 # 
 ##===----------------------------------------------------------------------===##
 
diff --git a/bindings/ocaml/llvm/Makefile b/bindings/ocaml/llvm/Makefile
index cbfb75ca15..2437468084 100644
--- a/bindings/ocaml/llvm/Makefile
+++ b/bindings/ocaml/llvm/Makefile
@@ -2,16 +2,12 @@
 # 
 #                     The LLVM Compiler Infrastructure
 #
-# This file was developed by the LLVM research group and is distributed under
-# the University of Illinois Open Source License. See LICENSE.TXT for details.
+# This file was developed by Gordon Henriksen and is distributed under the
+# University of Illinois Open Source License. See LICENSE.TXT for details.
 # 
 ##===----------------------------------------------------------------------===##
 # 
-# This is the makefile for the llvm-ml interface. Reference materials on
-# installing ocaml libraries:
-# 
-#   https://fedoraproject.org/wiki/Packaging/OCaml
-#   http://pkg-ocaml-maint.alioth.debian.org/ocaml_packaging_policy.txt
+# This is the makefile for the Objective Caml Llvm interface.
 # 
 ##===----------------------------------------------------------------------===##
 
diff --git a/include/llvm-c/Analysis.h b/include/llvm-c/Analysis.h
new file mode 100644
index 0000000000..b57577b058
--- /dev/null
+++ b/include/llvm-c/Analysis.h
@@ -0,0 +1,53 @@
+/*===-- llvm-c/Analysis.h - Analysis Library C Interface --------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file was developed by Gordon Henriksen and is distributed under the   *|
+|* University of Illinois Open Source License. See LICENSE.TXT for details.   *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This header declares the C interface to libLLVMAnalysis.a, which           *|
+|* implements various analyses of the LLVM IR.                                *|
+|*                                                                            *|
+|* Many exotic languages can interoperate with C code but have a harder time  *|
+|* with C++ due to name mangling. So in addition to C, this interface enables *|
+|* tools written in such languages.                                           *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#ifndef LLVM_C_ANALYSIS_H
+#define LLVM_C_ANALYSIS_H
+
+#include "llvm-c/Core.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef enum {
+  LLVMAbortProcessAction, /* verifier will print to stderr and abort() */
+  LLVMPrintMessageAction, /* verifier will print to stderr and return 1 */
+  LLVMReturnStatusAction  /* verifier will just return 1 */
+} LLVMVerifierFailureAction;
+
+
+/* Verifies that a module is valid, taking the specified action if not.
+   Optionally returns a human-readable description of any invalid constructs. */
+int LLVMVerifyModule(LLVMModuleRef M, LLVMVerifierFailureAction Action,
+                     char **OutMessage);
+
+/* Disposes of the message allocated by the verifier, if any. */ 
+void LLVMDisposeVerifierMessage(char *Message);
+
+/* Verifies that a single function is valid, taking the specified action. Useful
+   for debugging. */
+int LLVMVerifyFunction(LLVMValueRef Fn, LLVMVerifierFailureAction Action);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/Analysis/Analysis.cpp b/lib/Analysis/Analysis.cpp
new file mode 100644
index 0000000000..6403f2d7fa
--- /dev/null
+++ b/lib/Analysis/Analysis.cpp
@@ -0,0 +1,38 @@
+//===-- Analysis.cpp ------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Gordon Henriksen and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm-c/Analysis.h"
+#include "llvm/Analysis/Verifier.h"
+#include <fstream>
+
+using namespace llvm;
+
+int LLVMVerifyModule(LLVMModuleRef M, LLVMVerifierFailureAction Action,
+                     char **OutMessages) {
+  std::string Messages;
+  
+  int Result = verifyModule(*unwrap(M),
+                            static_cast<VerifierFailureAction>(Action),
+                            OutMessages? &Messages : 0);
+  
+  if (OutMessages)
+    *OutMessages = strdup(Messages.c_str());
+  
+  return Result;
+}
+
+void LLVMDisposeVerifierMessage(char *Message) {
+  free(Message);
+}
+
+int LLVMVerifyFunction(LLVMValueRef Fn, LLVMVerifierFailureAction Action) {
+  return verifyFunction(*unwrap<Function>(Fn),
+                        static_cast<VerifierFailureAction>(Action));
+}
+
diff --git a/lib/Bitcode/Writer/BitWriter.cpp b/lib/Bitcode/Writer/BitWriter.cpp
index 8f562e98d9..aadd878e15 100644
--- a/lib/Bitcode/Writer/BitWriter.cpp
+++ b/lib/Bitcode/Writer/BitWriter.cpp
@@ -2,8 +2,8 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file was developed by Gordon Henriksen and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/Bindings/Ocaml/analysis.ml b/test/Bindings/Ocaml/analysis.ml
new file mode 100644
index 0000000000..bf756169f4
--- /dev/null
+++ b/test/Bindings/Ocaml/analysis.ml
@@ -0,0 +1,46 @@
+(* RUN: %ocamlc llvm.cma llvm_analysis.cma %s -o %t
+ * RUN: ./%t %t.bc
+ *)
+
+open Llvm
+open Llvm_analysis
+
+(* Note that this takes a moment to link, so it's best to keep the number of
+   individual tests low. *)
+
+let test x = if not x then exit 1 else ()
+
+let bomb msg =
+  prerr_endline msg;
+  exit 2
+
+let _ =
+  let fty = function_type void_type [| |] in
+  let m = create_module "valid_m" in
+  let fn = define_function "valid_fn" fty m in
+  let at_entry = builder_at_end (entry_block fn) in
+  ignore (build_ret_void at_entry);
+  
+  
+  (* Test that valid constructs verify. *)
+  match verify_module m with
+    Some msg -> bomb "valid module failed verification!"
+  | None -> ();
+  
+  if not (verify_function fn) then bomb "valid function failed verification!";
+  
+  
+  (* Test that invalid constructs do not verify.
+     A basic block can contain only one terminator instruction. *)
+  ignore (build_ret_void at_entry);
+  
+  match verify_module m with
+    Some msg -> ()
+  | None -> bomb "invalid module passed verification!";
+  
+  if verify_function fn then bomb "invalid function passed verification!";
+  
+  
+  dispose_module m
+  
+  (* Don't bother to test assert_valid_{module,function}. *)