Make a major restructuring of the clang tree: introduce a top-level

lib dir and move all the libraries into it.  This follows the main
llvm tree, and allows the libraries to be built in parallel.  The
top level now enforces that all the libs are built before Driver,
but we don't care what order the libs are built in.  This speeds
up parallel builds, particularly incremental ones.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48402 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 182 insertions, 0 deletions

diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
new file mode 100644
index 0000000000..49f23f27c3
--- /dev/null
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -0,0 +1,182 @@
+//===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This coordinates the per-function state used while generating code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenFunction.h"
+#include "CodeGenModule.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/AST/AST.h"
+#include "llvm/CallingConv.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Support/CFG.h"
+using namespace clang;
+using namespace CodeGen;
+
+CodeGenFunction::CodeGenFunction(CodeGenModule &cgm) 
+  : CGM(cgm), Target(CGM.getContext().Target), SwitchInsn(NULL), 
+    CaseRangeBlock(NULL) {}
+
+ASTContext &CodeGenFunction::getContext() const {
+  return CGM.getContext();
+}
+
+
+llvm::BasicBlock *CodeGenFunction::getBasicBlockForLabel(const LabelStmt *S) {
+  llvm::BasicBlock *&BB = LabelMap[S];
+  if (BB) return BB;
+  
+  // Create, but don't insert, the new block.
+  return BB = new llvm::BasicBlock(S->getName());
+}
+
+llvm::Constant *
+CodeGenFunction::GetAddrOfStaticLocalVar(const BlockVarDecl *BVD) {
+  return cast<llvm::Constant>(LocalDeclMap[BVD]);
+}
+
+const llvm::Type *CodeGenFunction::ConvertType(QualType T) {
+  return CGM.getTypes().ConvertType(T);
+}
+
+bool CodeGenFunction::hasAggregateLLVMType(QualType T) {
+  return !T->isRealType() && !T->isPointerType() && !T->isReferenceType() &&
+         !T->isVoidType() && !T->isVectorType() && !T->isFunctionType();
+}
+
+
+void CodeGenFunction::GenerateCode(const FunctionDecl *FD) {
+  LLVMIntTy = ConvertType(getContext().IntTy);
+  LLVMPointerWidth = static_cast<unsigned>(
+    getContext().getTypeSize(getContext().getPointerType(getContext().VoidTy)));
+  
+  CurFuncDecl = FD;
+  CurFn = cast<llvm::Function>(CGM.GetAddrOfFunctionDecl(FD, true));
+  assert(CurFn->isDeclaration() && "Function already has body?");
+  
+  // TODO: Set up linkage and many other things.  Note, this is a simple 
+  // approximation of what we really want.
+  if (FD->getAttr<DLLImportAttr>())
+    CurFn->setLinkage(llvm::Function::DLLImportLinkage);
+  else if (FD->getAttr<DLLExportAttr>())
+    CurFn->setLinkage(llvm::Function::DLLExportLinkage);
+  else if (FD->getAttr<WeakAttr>() || FD->isInline())
+    CurFn->setLinkage(llvm::Function::WeakLinkage);
+  else if (FD->getStorageClass() == FunctionDecl::Static)
+    CurFn->setLinkage(llvm::Function::InternalLinkage);
+
+  if (FD->getAttr<FastCallAttr>())
+    CurFn->setCallingConv(llvm::CallingConv::Fast);
+
+  if (const VisibilityAttr *attr = FD->getAttr<VisibilityAttr>())
+    CurFn->setVisibility(attr->getVisibility());
+  // FIXME: else handle -fvisibility
+
+
+  unsigned FuncAttrs = 0;
+  if (FD->getAttr<NoThrowAttr>())
+    FuncAttrs |= llvm::ParamAttr::NoUnwind;
+  if (FD->getAttr<NoReturnAttr>())
+    FuncAttrs |= llvm::ParamAttr::NoReturn;
+  
+  if (FuncAttrs) {
+    llvm::ParamAttrsWithIndex PAWI = 
+      llvm::ParamAttrsWithIndex::get(0, FuncAttrs);
+    CurFn->setParamAttrs(llvm::PAListPtr::get(&PAWI, 1));
+  }
+
+  llvm::BasicBlock *EntryBB = new llvm::BasicBlock("entry", CurFn);
+  
+  // Create a marker to make it easy to insert allocas into the entryblock
+  // later.  Don't create this with the builder, because we don't want it
+  // folded.
+  llvm::Value *Undef = llvm::UndefValue::get(llvm::Type::Int32Ty);
+  AllocaInsertPt = new llvm::BitCastInst(Undef, llvm::Type::Int32Ty, "allocapt",
+                                         EntryBB);
+  
+  Builder.SetInsertPoint(EntryBB);
+  
+  // Emit allocs for param decls.  Give the LLVM Argument nodes names.
+  llvm::Function::arg_iterator AI = CurFn->arg_begin();
+  
+  // Name the struct return argument.
+  if (hasAggregateLLVMType(FD->getResultType())) {
+    AI->setName("agg.result");
+    ++AI;
+  }
+  
+  for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i, ++AI) {
+    assert(AI != CurFn->arg_end() && "Argument mismatch!");
+    EmitParmDecl(*FD->getParamDecl(i), AI);
+  }
+  
+  // Emit the function body.
+  EmitStmt(FD->getBody());
+  
+  // Emit a return for code that falls off the end. If insert point
+  // is a dummy block with no predecessors then remove the block itself.
+  llvm::BasicBlock *BB = Builder.GetInsertBlock();
+  if (isDummyBlock(BB))
+    BB->eraseFromParent();
+  else {
+    // FIXME: if this is C++ main, this should return 0.
+    if (CurFn->getReturnType() == llvm::Type::VoidTy)
+      Builder.CreateRetVoid();
+    else
+      Builder.CreateRet(llvm::UndefValue::get(CurFn->getReturnType()));
+  }
+  assert(BreakContinueStack.empty() &&
+         "mismatched push/pop in break/continue stack!");
+  
+  // Remove the AllocaInsertPt instruction, which is just a convenience for us.
+  AllocaInsertPt->eraseFromParent();
+  AllocaInsertPt = 0;
+  
+  // Verify that the function is well formed.
+  assert(!verifyFunction(*CurFn));
+}
+
+/// isDummyBlock - Return true if BB is an empty basic block
+/// with no predecessors.
+bool CodeGenFunction::isDummyBlock(const llvm::BasicBlock *BB) {
+  if (BB->empty() && pred_begin(BB) == pred_end(BB)) 
+    return true;
+  return false;
+}
+
+/// StartBlock - Start new block named N. If insert block is a dummy block
+/// then reuse it.
+void CodeGenFunction::StartBlock(const char *N) {
+  llvm::BasicBlock *BB = Builder.GetInsertBlock();
+  if (!isDummyBlock(BB))
+    EmitBlock(new llvm::BasicBlock(N));
+  else
+    BB->setName(N);
+}
+
+/// getCGRecordLayout - Return record layout info.
+const CGRecordLayout *CodeGenFunction::getCGRecordLayout(CodeGenTypes &CGT,
+                                                         QualType Ty) {
+  const RecordType *RTy = Ty->getAsRecordType();
+  assert (RTy && "Unexpected type. RecordType expected here.");
+
+  return CGT.getCGRecordLayout(RTy->getDecl());
+}
+
+/// WarnUnsupported - Print out a warning that codegen doesn't support the
+/// specified stmt yet.
+void CodeGenFunction::WarnUnsupported(const Stmt *S, const char *Type) {
+  CGM.WarnUnsupported(S, Type);
+}
+