From bb18a3cfe7554143622af4911028605e89c80104 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Steinbrink?= <bsteinbr@gmail.com>
Date: Sat, 14 Mar 2015 13:14:04 +0100
Subject: [PATCH] Drop support for LLVM < 3.5 and fix compile errors with 3.5

LLVM older that 3.6 has a bug that cause assertions when compiling certain
constructs. For 3.5 there's still a chance that the bug might get fixed
in 3.5.2, so let's keep allowing to compile with it for it for now.
---
 configure                    |   4 +-
 src/rustllvm/RustWrapper.cpp | 120 ++++-------------------------------
 2 files changed, 14 insertions(+), 110 deletions(-)

diff --git a/configure b/configure
index 73e09158539aa..760203ae5cf4e 100755
--- a/configure
+++ b/configure
@@ -823,11 +823,11 @@ then
     LLVM_VERSION=$($LLVM_CONFIG --version)
 
     case $LLVM_VERSION in
-        (3.[2-6]*)
+        (3.[5-6]*)
             msg "found ok version of LLVM: $LLVM_VERSION"
             ;;
         (*)
-            err "bad LLVM version: $LLVM_VERSION, need >=3.0svn"
+            err "bad LLVM version: $LLVM_VERSION, need >=3.5"
             ;;
     esac
 fi
diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index aaf6d8df29cad..9a87c03f1c407 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -14,11 +14,7 @@
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/DiagnosticPrinter.h"
 
-#if LLVM_VERSION_MINOR >= 5
 #include "llvm/IR/CallSite.h"
-#else
-#include "llvm/Support/CallSite.h"
-#endif
 
 //===----------------------------------------------------------------------===
 //
@@ -33,7 +29,6 @@ using namespace llvm::object;
 
 static char *LastError;
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" LLVMMemoryBufferRef
 LLVMRustCreateMemoryBufferWithContentsOfFile(const char *Path) {
   ErrorOr<std::unique_ptr<MemoryBuffer>> buf_or = MemoryBuffer::getFile(Path,
@@ -45,18 +40,6 @@ LLVMRustCreateMemoryBufferWithContentsOfFile(const char *Path) {
   }
   return wrap(buf_or.get().release());
 }
-#else
-extern "C" LLVMMemoryBufferRef
-LLVMRustCreateMemoryBufferWithContentsOfFile(const char *Path) {
-  OwningPtr<MemoryBuffer> buf;
-  error_code err = MemoryBuffer::getFile(Path, buf, -1, false);
-  if (err) {
-      LLVMRustSetLastError(err.message().c_str());
-      return NULL;
-  }
-  return wrap(buf.take());
-}
-#endif
 
 extern "C" char *LLVMRustGetLastError(void) {
   char *ret = LastError;
@@ -116,7 +99,6 @@ extern "C" void LLVMAddCallSiteAttribute(LLVMValueRef Instr, unsigned index, uin
 }
 
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" void LLVMAddDereferenceableCallSiteAttr(LLVMValueRef Instr, unsigned idx, uint64_t b) {
   CallSite Call = CallSite(unwrap<Instruction>(Instr));
   AttrBuilder B;
@@ -126,9 +108,6 @@ extern "C" void LLVMAddDereferenceableCallSiteAttr(LLVMValueRef Instr, unsigned
                                        AttributeSet::get(Call->getContext(),
                                                          idx, B)));
 }
-#else
-extern "C" void LLVMAddDereferenceableCallSiteAttr(LLVMValueRef, unsigned, uint64_t) {}
-#endif
 
 extern "C" void LLVMAddFunctionAttribute(LLVMValueRef Fn, unsigned index, uint64_t Val) {
   Function *A = unwrap<Function>(Fn);
@@ -137,16 +116,12 @@ extern "C" void LLVMAddFunctionAttribute(LLVMValueRef Fn, unsigned index, uint64
   A->addAttributes(index, AttributeSet::get(A->getContext(), index, B));
 }
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" void LLVMAddDereferenceableAttr(LLVMValueRef Fn, unsigned index, uint64_t bytes) {
   Function *A = unwrap<Function>(Fn);
   AttrBuilder B;
   B.addDereferenceableAttr(bytes);
   A->addAttributes(index, AttributeSet::get(A->getContext(), index, B));
 }
-#else
-extern "C" void LLVMAddDereferenceableAttr(LLVMValueRef, unsigned, uint64_t) {}
-#endif
 
 extern "C" void LLVMAddFunctionAttrString(LLVMValueRef Fn, unsigned index, const char *Name) {
   Function *F = unwrap<Function>(Fn);
@@ -199,10 +174,8 @@ extern "C" LLVMValueRef LLVMBuildAtomicCmpXchg(LLVMBuilderRef B,
                                                AtomicOrdering order,
                                                AtomicOrdering failure_order) {
     return wrap(unwrap(B)->CreateAtomicCmpXchg(unwrap(target), unwrap(old),
-                                               unwrap(source), order
-#if LLVM_VERSION_MINOR >= 5
-                                               , failure_order
-#endif
+                                               unwrap(source), order,
+                                               failure_order
                                                ));
 }
 extern "C" LLVMValueRef LLVMBuildAtomicFence(LLVMBuilderRef B, AtomicOrdering order) {
@@ -247,11 +220,7 @@ DIT unwrapDI(LLVMMetadataRef ref) {
     return DIT(ref ? unwrap<MDNode>(ref) : NULL);
 }
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" const uint32_t LLVMRustDebugMetadataVersion = DEBUG_METADATA_VERSION;
-#else
-extern "C" const uint32_t LLVMRustDebugMetadataVersion = 1;
-#endif
 
 extern "C" void LLVMRustAddModuleFlag(LLVMModuleRef M,
                                       const char *name,
@@ -383,10 +352,8 @@ extern "C" LLVMMetadataRef LLVMDIBuilderCreateStructType(
         unwrapDI<DIType>(DerivedFrom),
         unwrapDI<DIArray>(Elements),
         RunTimeLang,
-        unwrapDI<DIType>(VTableHolder)
-#if LLVM_VERSION_MINOR >= 4
-        ,UniqueId
-#endif
+        unwrapDI<DIType>(VTableHolder),
+        UniqueId
         ));
 }
 
@@ -465,8 +432,8 @@ extern "C" LLVMMetadataRef LLVMDIBuilderCreateVariable(
 #if LLVM_VERSION_MINOR < 6
     if (AddrOpsCount > 0) {
         SmallVector<llvm::Value *, 16> addr_ops;
-        llvm::Type *Int64Ty = Type::getInt64Ty(VMContext);
-        for (int i = 0; i < AddrOpsCount; ++i)
+        llvm::Type *Int64Ty = Type::getInt64Ty(unwrap<MDNode>(Scope)->getContext());
+        for (unsigned i = 0; i < AddrOpsCount; ++i)
             addr_ops.push_back(ConstantInt::get(Int64Ty, AddrOps[i]));
 
         return wrap(Builder->createComplexVariable(
@@ -522,7 +489,11 @@ extern "C" LLVMMetadataRef LLVMDIBuilderGetOrCreateArray(
     LLVMMetadataRef* Ptr,
     unsigned Count) {
     return wrap(Builder->getOrCreateArray(
+#if LLVM_VERSION_MINOR >= 6
         ArrayRef<Metadata*>(unwrap(Ptr), Count)));
+#else
+        ArrayRef<Value*>(reinterpret_cast<Value**>(Ptr), Count)));
+#endif
 }
 
 extern "C" LLVMValueRef LLVMDIBuilderInsertDeclareAtEnd(
@@ -627,19 +598,11 @@ extern "C" LLVMMetadataRef LLVMDIBuilderCreateUnionType(
         AlignInBits,
         Flags,
         unwrapDI<DIArray>(Elements),
-        RunTimeLang
-#if LLVM_VERSION_MINOR >= 4
-        ,UniqueId
-#endif
+        RunTimeLang,
+        UniqueId
         ));
 }
 
-#if LLVM_VERSION_MINOR < 5
-extern "C" void LLVMSetUnnamedAddr(LLVMValueRef Value, LLVMBool Unnamed) {
-    unwrap<GlobalValue>(Value)->setUnnamedAddr(Unnamed);
-}
-#endif
-
 extern "C" LLVMMetadataRef LLVMDIBuilderCreateTemplateTypeParameter(
     DIBuilderRef Builder,
     LLVMMetadataRef Scope,
@@ -730,7 +693,6 @@ extern "C" void LLVMWriteValueToString(LLVMValueRef Value, RustStringRef str) {
     os << ")";
 }
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" bool
 LLVMRustLinkInExternalBitcode(LLVMModuleRef dst, char *bc, size_t len) {
     Module *Dst = unwrap(dst);
@@ -763,28 +725,7 @@ LLVMRustLinkInExternalBitcode(LLVMModuleRef dst, char *bc, size_t len) {
     }
     return true;
 }
-#else
-extern "C" bool
-LLVMRustLinkInExternalBitcode(LLVMModuleRef dst, char *bc, size_t len) {
-    Module *Dst = unwrap(dst);
-    MemoryBuffer* buf = MemoryBuffer::getMemBufferCopy(StringRef(bc, len));
-    std::string Err;
-    Module *Src = llvm::getLazyBitcodeModule(buf, Dst->getContext(), &Err);
-    if (!Src) {
-        LLVMRustSetLastError(Err.c_str());
-        delete buf;
-        return false;
-    }
-
-    if (Linker::LinkModules(Dst, Src, Linker::DestroySource, &Err)) {
-        LLVMRustSetLastError(Err.c_str());
-        return false;
-    }
-    return true;
-}
-#endif
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" void*
 LLVMRustOpenArchive(char *path) {
     ErrorOr<std::unique_ptr<MemoryBuffer>> buf_or = MemoryBuffer::getFile(path,
@@ -817,23 +758,6 @@ LLVMRustOpenArchive(char *path) {
 
     return ret;
 }
-#else
-extern "C" void*
-LLVMRustOpenArchive(char *path) {
-    OwningPtr<MemoryBuffer> buf;
-    error_code err = MemoryBuffer::getFile(path, buf, -1, false);
-    if (err) {
-        LLVMRustSetLastError(err.message().c_str());
-        return NULL;
-    }
-    Archive *ret = new Archive(buf.take(), err);
-    if (err) {
-        LLVMRustSetLastError(err.message().c_str());
-        return NULL;
-    }
-    return ret;
-}
-#endif
 
 extern "C" const char*
 #if LLVM_VERSION_MINOR >= 6
@@ -844,21 +768,12 @@ LLVMRustArchiveReadSection(OwningBinary<Archive> *ob, char *name, size_t *size)
 LLVMRustArchiveReadSection(Archive *ar, char *name, size_t *size) {
 #endif
 
-#if LLVM_VERSION_MINOR >= 5
     Archive::child_iterator child = ar->child_begin(),
                               end = ar->child_end();
     for (; child != end; ++child) {
         ErrorOr<StringRef> name_or_err = child->getName();
         if (name_or_err.getError()) continue;
         StringRef sect_name = name_or_err.get();
-#else
-    Archive::child_iterator child = ar->begin_children(),
-                              end = ar->end_children();
-    for (; child != end; ++child) {
-        StringRef sect_name;
-        error_code err = child->getName(sect_name);
-        if (err) continue;
-#endif
         if (sect_name.trim(" ") == name) {
             StringRef buf = child->getBuffer();
             *size = buf.size();
@@ -877,18 +792,11 @@ LLVMRustDestroyArchive(Archive *ar) {
     delete ar;
 }
 
-#if LLVM_VERSION_MINOR >= 5
 extern "C" void
 LLVMRustSetDLLExportStorageClass(LLVMValueRef Value) {
     GlobalValue *V = unwrap<GlobalValue>(Value);
     V->setDLLStorageClass(GlobalValue::DLLExportStorageClass);
 }
-#else
-extern "C" void
-LLVMRustSetDLLExportStorageClass(LLVMValueRef Value) {
-    LLVMSetLinkage(Value, LLVMDLLExportLinkage);
-}
-#endif
 
 extern "C" int
 LLVMVersionMinor() {
@@ -918,11 +826,7 @@ inline section_iterator *unwrap(LLVMSectionIteratorRef SI) {
 extern "C" int
 LLVMRustGetSectionName(LLVMSectionIteratorRef SI, const char **ptr) {
     StringRef ret;
-#if LLVM_VERSION_MINOR >= 5
     if (std::error_code ec = (*unwrap(SI))->getName(ret))
-#else
-    if (error_code ec = (*unwrap(SI))->getName(ret))
-#endif
       report_fatal_error(ec.message());
     *ptr = ret.data();
     return ret.size();