Stage two of getting CFE top correct.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@39734 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 98 insertions, 0 deletions

diff --git a/CodeGen/CodeGenFunction.cpp b/CodeGen/CodeGenFunction.cpp
new file mode 100644
index 0000000000..662c3b513c
--- /dev/null
+++ b/CodeGen/CodeGenFunction.cpp
@@ -0,0 +1,98 @@
+//===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and 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/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
+#include "llvm/Analysis/Verifier.h"
+using namespace clang;
+using namespace CodeGen;
+
+CodeGenFunction::CodeGenFunction(CodeGenModule &cgm) 
+  : CGM(cgm), Target(CGM.getContext().Target) {}
+
+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());
+}
+
+
+const llvm::Type *CodeGenFunction::ConvertType(QualType T) {
+  return CGM.getTypes().ConvertType(T);
+}
+
+bool CodeGenFunction::hasAggregateLLVMType(QualType T) {
+  return !T->isRealType() && !T->isPointerType() && !T->isVoidType() &&
+         !T->isVectorType();
+}
+
+
+void CodeGenFunction::GenerateCode(const FunctionDecl *FD) {
+  LLVMIntTy = ConvertType(getContext().IntTy);
+  LLVMPointerWidth = Target.getPointerWidth(SourceLocation());
+  
+  CurFn = cast<llvm::Function>(CGM.GetAddrOfGlobalDecl(FD));
+  CurFuncDecl = FD;
+  
+  // TODO: Set up linkage and many other things.
+  assert(CurFn->isDeclaration() && "Function already has body?");
+  
+  llvm::BasicBlock *EntryBB = new llvm::BasicBlock("entry", CurFn);
+  
+  Builder.SetInsertPoint(EntryBB);
+
+  // Create a marker to make it easy to insert allocas into the entryblock
+  // later.
+  llvm::Value *Undef = llvm::UndefValue::get(llvm::Type::Int32Ty);
+  AllocaInsertPt = Builder.CreateBitCast(Undef,llvm::Type::Int32Ty, "allocapt");
+  
+  // 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.
+  // 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()));
+  
+  // Verify that the function is well formed.
+  assert(!verifyFunction(*CurFn));
+}
+