still support LLVM4 for emscripten

src/rustllvm/RustWrapper.cpp

@@ -16,8 +16,14 @@
 #include "llvm/Object/Archive.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Bitcode/BitcodeWriterPass.h"
+
 #include "llvm/IR/CallSite.h"
+
+#if LLVM_VERSION_GE(5, 0)
 #include "llvm/ADT/Optional.h"
+#else
+#include <cstdlib>
+#endif
 
 //===----------------------------------------------------------------------===
 //
@@ -170,7 +176,14 @@ extern "C" void LLVMRustAddCallSiteAttribute(LLVMValueRef Instr, unsigned Index,
                                              LLVMRustAttribute RustAttr) {
   CallSite Call = CallSite(unwrap<Instruction>(Instr));
   Attribute Attr = Attribute::get(Call->getContext(), fromRust(RustAttr));
+#if LLVM_VERSION_GE(5, 0)
   Call.addAttribute(Index, Attr);
+#else
+  AttrBuilder B(Attr);
+  Call.setAttributes(Call.getAttributes().addAttributes(
+      Call->getContext(), Index,
+      AttributeSet::get(Call->getContext(), Index, B)));
+#endif
 }
 
 extern "C" void LLVMRustAddAlignmentCallSiteAttr(LLVMValueRef Instr,
@@ -179,8 +192,14 @@ extern "C" void LLVMRustAddAlignmentCallSiteAttr(LLVMValueRef Instr,
   CallSite Call = CallSite(unwrap<Instruction>(Instr));
   AttrBuilder B;
   B.addAlignmentAttr(Bytes);
+#if LLVM_VERSION_GE(5, 0)
   Call.setAttributes(Call.getAttributes().addAttributes(
       Call->getContext(), Index, B));
+#else
+  Call.setAttributes(Call.getAttributes().addAttributes(
+      Call->getContext(), Index,
+      AttributeSet::get(Call->getContext(), Index, B)));
+#endif
 }
 
 extern "C" void LLVMRustAddDereferenceableCallSiteAttr(LLVMValueRef Instr,
@@ -189,8 +208,14 @@ extern "C" void LLVMRustAddDereferenceableCallSiteAttr(LLVMValueRef Instr,
   CallSite Call = CallSite(unwrap<Instruction>(Instr));
   AttrBuilder B;
   B.addDereferenceableAttr(Bytes);
+#if LLVM_VERSION_GE(5, 0)
   Call.setAttributes(Call.getAttributes().addAttributes(
       Call->getContext(), Index, B));
+#else
+  Call.setAttributes(Call.getAttributes().addAttributes(
+      Call->getContext(), Index,
+      AttributeSet::get(Call->getContext(), Index, B)));
+#endif
 }
 
 extern "C" void LLVMRustAddDereferenceableOrNullCallSiteAttr(LLVMValueRef Instr,
@@ -199,8 +224,14 @@ extern "C" void LLVMRustAddDereferenceableOrNullCallSiteAttr(LLVMValueRef Instr,
   CallSite Call = CallSite(unwrap<Instruction>(Instr));
   AttrBuilder B;
   B.addDereferenceableOrNullAttr(Bytes);
+#if LLVM_VERSION_GE(5, 0)
   Call.setAttributes(Call.getAttributes().addAttributes(
       Call->getContext(), Index, B));
+#else
+  Call.setAttributes(Call.getAttributes().addAttributes(
+      Call->getContext(), Index,
+      AttributeSet::get(Call->getContext(), Index, B)));
+#endif
 }
 
 extern "C" void LLVMRustAddFunctionAttribute(LLVMValueRef Fn, unsigned Index,
@@ -208,7 +239,11 @@ extern "C" void LLVMRustAddFunctionAttribute(LLVMValueRef Fn, unsigned Index,
   Function *A = unwrap<Function>(Fn);
   Attribute Attr = Attribute::get(A->getContext(), fromRust(RustAttr));
   AttrBuilder B(Attr);
+#if LLVM_VERSION_GE(5, 0)
   A->addAttributes(Index, B);
+#else
+  A->addAttributes(Index, AttributeSet::get(A->getContext(), Index, B));
+#endif
 }
 
 extern "C" void LLVMRustAddAlignmentAttr(LLVMValueRef Fn,
@@ -217,7 +252,11 @@ extern "C" void LLVMRustAddAlignmentAttr(LLVMValueRef Fn,
   Function *A = unwrap<Function>(Fn);
   AttrBuilder B;
   B.addAlignmentAttr(Bytes);
+#if LLVM_VERSION_GE(5, 0)
   A->addAttributes(Index, B);
+#else
+  A->addAttributes(Index, AttributeSet::get(A->getContext(), Index, B));
+#endif
 }
 
 extern "C" void LLVMRustAddDereferenceableAttr(LLVMValueRef Fn, unsigned Index,
@@ -225,7 +264,11 @@ extern "C" void LLVMRustAddDereferenceableAttr(LLVMValueRef Fn, unsigned Index,
   Function *A = unwrap<Function>(Fn);
   AttrBuilder B;
   B.addDereferenceableAttr(Bytes);
+#if LLVM_VERSION_GE(5, 0)
   A->addAttributes(Index, B);
+#else
+  A->addAttributes(Index, AttributeSet::get(A->getContext(), Index, B));
+#endif
 }
 
 extern "C" void LLVMRustAddDereferenceableOrNullAttr(LLVMValueRef Fn,
@@ -234,7 +277,11 @@ extern "C" void LLVMRustAddDereferenceableOrNullAttr(LLVMValueRef Fn,
   Function *A = unwrap<Function>(Fn);
   AttrBuilder B;
   B.addDereferenceableOrNullAttr(Bytes);
+#if LLVM_VERSION_GE(5, 0)
   A->addAttributes(Index, B);
+#else
+  A->addAttributes(Index, AttributeSet::get(A->getContext(), Index, B));
+#endif
 }
 
 extern "C" void LLVMRustAddFunctionAttrStringValue(LLVMValueRef Fn,
@@ -244,7 +291,11 @@ extern "C" void LLVMRustAddFunctionAttrStringValue(LLVMValueRef Fn,
   Function *F = unwrap<Function>(Fn);
   AttrBuilder B;
   B.addAttribute(Name, Value);
+#if LLVM_VERSION_GE(5, 0)
   F->addAttributes(Index, B);
+#else
+  F->addAttributes(Index, AttributeSet::get(F->getContext(), Index, B));
+#endif
 }
 
 extern "C" void LLVMRustRemoveFunctionAttributes(LLVMValueRef Fn,
@@ -254,7 +305,12 @@ extern "C" void LLVMRustRemoveFunctionAttributes(LLVMValueRef Fn,
   Attribute Attr = Attribute::get(F->getContext(), fromRust(RustAttr));
   AttrBuilder B(Attr);
   auto PAL = F->getAttributes();
+#if LLVM_VERSION_GE(5, 0)
   auto PALNew = PAL.removeAttributes(F->getContext(), Index, B);
+#else
+  const AttributeSet PALNew = PAL.removeAttributes(
+      F->getContext(), Index, AttributeSet::get(F->getContext(), Index, B));
+#endif
   F->setAttributes(PALNew);
 }
 
@@ -304,6 +360,7 @@ enum class LLVMRustSynchronizationScope {
   CrossThread,
 };
 
+#if LLVM_VERSION_GE(5, 0)
 static SyncScope::ID fromRust(LLVMRustSynchronizationScope Scope) {
   switch (Scope) {
   case LLVMRustSynchronizationScope::SingleThread:
@@ -314,6 +371,18 @@ static SyncScope::ID fromRust(LLVMRustSynchronizationScope Scope) {
     report_fatal_error("bad SynchronizationScope.");
   }
 }
+#else
+static SynchronizationScope fromRust(LLVMRustSynchronizationScope Scope) {
+  switch (Scope) {
+  case LLVMRustSynchronizationScope::SingleThread:
+    return SingleThread;
+  case LLVMRustSynchronizationScope::CrossThread:
+    return CrossThread;
+  default:
+    report_fatal_error("bad SynchronizationScope.");
+  }
+}
+#endif
 
 extern "C" LLVMValueRef
 LLVMRustBuildAtomicFence(LLVMBuilderRef B, LLVMAtomicOrdering Order,
@@ -353,6 +422,18 @@ extern "C" void LLVMRustAppendModuleInlineAsm(LLVMModuleRef M, const char *Asm)
 
 typedef DIBuilder *LLVMRustDIBuilderRef;
 
+#if LLVM_VERSION_LT(5, 0)
+typedef struct LLVMOpaqueMetadata *LLVMMetadataRef;
+
+namespace llvm {
+DEFINE_ISA_CONVERSION_FUNCTIONS(Metadata, LLVMMetadataRef)
+
+inline Metadata **unwrap(LLVMMetadataRef *Vals) {
+  return reinterpret_cast<Metadata **>(Vals);
+}
+}
+#endif
+
 template <typename DIT> DIT *unwrapDIPtr(LLVMMetadataRef Ref) {
   return (DIT *)(Ref ? unwrap<MDNode>(Ref) : nullptr);
 }
@@ -468,6 +549,11 @@ static DINode::DIFlags fromRust(LLVMRustDIFlags Flags) {
   if (isSet(Flags & LLVMRustDIFlags::FlagRValueReference)) {
     Result |= DINode::DIFlags::FlagRValueReference;
   }
+#if LLVM_VERSION_LE(4, 0)
+  if (isSet(Flags & LLVMRustDIFlags::FlagExternalTypeRef)) {
+    Result |= DINode::DIFlags::FlagExternalTypeRef;
+  }
+#endif
   if (isSet(Flags & LLVMRustDIFlags::FlagIntroducedVirtual)) {
     Result |= DINode::DIFlags::FlagIntroducedVirtual;
   }
@@ -566,7 +652,9 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreatePointerType(
     uint64_t SizeInBits, uint32_t AlignInBits, const char *Name) {
   return wrap(Builder->createPointerType(unwrapDI<DIType>(PointeeTy),
                                          SizeInBits, AlignInBits,
+#if LLVM_VERSION_GE(5, 0)
                                          /* DWARFAddressSpace */ None,
+#endif
                                          Name));
 }
 
@@ -737,8 +825,15 @@ LLVMRustDIBuilderCreateNameSpace(LLVMRustDIBuilderRef Builder,
                                  LLVMMetadataRef Scope, const char *Name,
                                  LLVMMetadataRef File, unsigned LineNo) {
   return wrap(Builder->createNameSpace(
-      unwrapDI<DIDescriptor>(Scope), Name,
+      unwrapDI<DIDescriptor>(Scope), Name
+#if LLVM_VERSION_LT(5, 0)
+      ,
+      unwrapDI<DIFile>(File), LineNo
+#endif
+#if LLVM_VERSION_GE(4, 0)
+      ,
       false // ExportSymbols (only relevant for C++ anonymous namespaces)
+#endif
       ));
 }
 
@@ -767,7 +862,12 @@ extern "C" int64_t LLVMRustDIBuilderCreateOpDeref() {
 }
 
 extern "C" int64_t LLVMRustDIBuilderCreateOpPlusUconst() {
+#if LLVM_VERSION_GE(5, 0)
   return dwarf::DW_OP_plus_uconst;
+#else
+  // older LLVM used `plus` to behave like `plus_uconst`.
+  return dwarf::DW_OP_plus;
+#endif
 }
 
 extern "C" void LLVMRustWriteTypeToString(LLVMTypeRef Ty, RustStringRef Str) {
@@ -839,12 +939,21 @@ extern "C" void LLVMRustUnpackOptimizationDiagnostic(
   *FunctionOut = wrap(&Opt->getFunction());
 
   RawRustStringOstream FilenameOS(FilenameOut);
+#if LLVM_VERSION_GE(5,0)
   DiagnosticLocation loc = Opt->getLocation();
   if (loc.isValid()) {
     *Line = loc.getLine();
     *Column = loc.getColumn();
     FilenameOS << loc.getFilename();
   }
+#else
+  const DebugLoc &loc = Opt->getDebugLoc();
+  if (loc) {
+    *Line = loc.getLine();
+    *Column = loc.getCol();
+    FilenameOS << cast<DIScope>(loc.getScope())->getFilename();
+  }
+#endif
 
   RawRustStringOstream MessageOS(MessageOut);
   MessageOS << Opt->getMsg();
@@ -1264,6 +1373,7 @@ LLVMRustModuleCost(LLVMModuleRef M) {
 }
 
 // Vector reductions:
+#if LLVM_VERSION_GE(5, 0)
 extern "C" LLVMValueRef
 LLVMRustBuildVectorReduceFAdd(LLVMBuilderRef B, LLVMValueRef Acc, LLVMValueRef Src) {
     return wrap(unwrap(B)->CreateFAddReduce(unwrap(Acc),unwrap(Src)));
@@ -1309,6 +1419,62 @@ LLVMRustBuildVectorReduceFMax(LLVMBuilderRef B, LLVMValueRef Src, bool NoNaN) {
   return wrap(unwrap(B)->CreateFPMaxReduce(unwrap(Src), NoNaN));
 }
 
+#else
+
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFAdd(LLVMBuilderRef, LLVMValueRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFMul(LLVMBuilderRef, LLVMValueRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceAdd(LLVMBuilderRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceMul(LLVMBuilderRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceAnd(LLVMBuilderRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceOr(LLVMBuilderRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceXor(LLVMBuilderRef, LLVMValueRef) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceMin(LLVMBuilderRef, LLVMValueRef, bool) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceMax(LLVMBuilderRef, LLVMValueRef, bool) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFMin(LLVMBuilderRef, LLVMValueRef, bool) {
+  return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFMax(LLVMBuilderRef, LLVMValueRef, bool) {
+  return nullptr;
+}
+#endif
+
+#if LLVM_VERSION_LT(4, 0)
+extern "C" LLVMValueRef
+LLVMBuildExactUDiv(LLVMBuilderRef B, LLVMValueRef LHS,
+                   LLVMValueRef RHS, const char *Name) {
+  return wrap(unwrap(B)->CreateExactUDiv(unwrap(LHS), unwrap(RHS), Name));
+}
+#endif
+
 #if LLVM_VERSION_GE(6, 0)
 extern "C" LLVMValueRef
 LLVMRustBuildMinNum(LLVMBuilderRef B, LLVMValueRef LHS, LLVMValueRef RHS) {