Enable alias analysis and the function attributes pass.

The C API extension is already upstream, we can drop the local copy once
the bots are updated.

src/comp/lib/llvm.rs

@@ -775,6 +775,8 @@ native mod llvm = llvm_lib {
     fn LLVMAddSimplifyLibCallsPass(PassManagerRef PM);
     fn LLVMAddLoopIdiomPass(PassManagerRef PM);
     fn LLVMAddEarlyCSEPass(PassManagerRef PM);
+    fn LLVMAddTypeBasedAliasAnalysisPass(PassManagerRef PM);
+    fn LLVMAddBasicAliasAnalysisPass(PassManagerRef PM);
 
     /** Destroys a memory buffer. */
     fn LLVMDisposeMemoryBuffer(MemoryBufferRef MemBuf);

src/comp/middle/trans.rs

@@ -6647,6 +6647,8 @@ fn run_passes(ModuleRef llmod, bool opt) {
         auto fpm = mk_pass_manager();
 
         // createStandardFunctionPasses
+        llvm.LLVMAddTypeBasedAliasAnalysisPass(fpm.llpm);
+        llvm.LLVMAddBasicAliasAnalysisPass(fpm.llpm);
         llvm.LLVMAddCFGSimplificationPass(fpm.llpm);
         llvm.LLVMAddScalarReplAggregatesPass(fpm.llpm);
         llvm.LLVMAddEarlyCSEPass(fpm.llpm);
@@ -6654,6 +6656,8 @@ fn run_passes(ModuleRef llmod, bool opt) {
         llvm.LLVMRunPassManager(fpm.llpm, llmod);
 
         // createStandardModulePasses
+        llvm.LLVMAddTypeBasedAliasAnalysisPass(pm.llpm);
+        llvm.LLVMAddBasicAliasAnalysisPass(pm.llpm);
         llvm.LLVMAddGlobalOptimizerPass(pm.llpm);
         llvm.LLVMAddIPSCCPPass(pm.llpm);
         llvm.LLVMAddDeadArgEliminationPass(pm.llpm);
@@ -6661,10 +6665,7 @@ fn run_passes(ModuleRef llmod, bool opt) {
         llvm.LLVMAddCFGSimplificationPass(pm.llpm);
         llvm.LLVMAddPruneEHPass(pm.llpm);
         llvm.LLVMAddFunctionInliningPass(pm.llpm);
-
+        llvm.LLVMAddFunctionAttrsPass(pm.llpm);
-        // FIXME: crashes!
-        // llvm.LLVMAddFunctionAttrsPass(pm.llpm);
-
         llvm.LLVMAddScalarReplAggregatesPassSSA(pm.llpm);
         llvm.LLVMAddEarlyCSEPass(pm.llpm);
         llvm.LLVMAddSimplifyLibCallsPass(pm.llpm);

src/rustllvm/Passes.cpp

@@ -0,0 +1,14 @@
+#include "llvm/Analysis/Passes.h"
+#include "llvm/PassManager.h"
+#include "llvm-c/Core.h"
+
+using namespace llvm;
+extern "C" {
+  void LLVMAddTypeBasedAliasAnalysisPass(LLVMPassManagerRef PM) {
+    unwrap(PM)->add(createTypeBasedAliasAnalysisPass());
+  }
+
+  void LLVMAddBasicAliasAnalysisPass(LLVMPassManagerRef PM) {
+    unwrap(PM)->add(createBasicAliasAnalysisPass());
+  }
+}

src/rustllvm/RustWrapper.cpp

@@ -31,3 +31,8 @@ extern "C" const char *LLVMRustGetLastError(void) {
 
 LLVMOpaqueObjectFile* (*RustHackToFetchObjectO)(LLVMOpaqueMemoryBuffer*)
   = LLVMCreateObjectFile;
+
+extern "C" void LLVMAddBasicAliasAnalysisPass(LLVMPassManagerRef PM);
+
+void (*RustHackToFetchPassesO)(LLVMPassManagerRef PM) =
+  LLVMAddBasicAliasAnalysisPass;

src/rustllvm/rustllvm.def.in

@@ -15,6 +15,7 @@ LLVMAddAggressiveDCEPass
 LLVMAddAlias
 LLVMAddArgumentPromotionPass
 LLVMAddAttribute
+LLVMaddBasicAliasAnalysisPass
 LLVMAddCFGSimplificationPass
 LLVMAddCase
 LLVMAddConstantMergePass
@@ -67,6 +68,7 @@ LLVMAddStripDeadPrototypesPass
 LLVMAddStripSymbolsPass
 LLVMAddTailCallEliminationPass
 LLVMAddTargetData
+LLVMAddTypeBasedAliasAnalysisPass
 LLVMAddTypeName
 LLVMAddVerifierPass
 LLVMAlignOf