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//===--- 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 "CGSystemRuntime.h"
#include "flang/AST/ASTContext.h"
#include "flang/AST/Decl.h"
#include "flang/AST/Stmt.h"
#include "flang/AST/Expr.h"
#include "flang/Frontend/CodeGenOptions.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Operator.h"
namespace flang {
namespace CodeGen {
CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, llvm::Function *Fn)
: CGM(cgm), /*, Target(cgm.getTarget()),*/
Builder(cgm.getModule().getContext()),
UnreachableBlock(nullptr), CurFn(Fn), IsMainProgram(false),
ReturnValuePtr(nullptr), AllocaInsertPt(nullptr),
AssignedGotoVarPtr(nullptr), AssignedGotoDispatchBlock(nullptr),
CurLoopScope(nullptr), CurInlinedStmtFunc(nullptr) {
HasSavedVariables = false;
}
CodeGenFunction::~CodeGenFunction() {
}
void CodeGenFunction::EmitMainProgramBody(const DeclContext *DC, const Stmt *S) {
EmitBlock(createBasicBlock("program_entry"));
CGM.getSystemRuntime().EmitInit(*this);
IsMainProgram = true;
ReturnBlock = createBasicBlock("program_exit");
EmitFunctionBody(DC, S);
EmitBlock(ReturnBlock);
EmitCleanup();
auto ReturnValue = Builder.getInt32(0);
Builder.CreateRet(ReturnValue);
if(AssignedGotoDispatchBlock)
EmitAssignedGotoDispatcher();
}
void CodeGenFunction::EmitFunctionArguments(const FunctionDecl *Func,
const CGFunctionInfo *Info) {
ArgsList = Func->getArguments();
ArgsInfo = Info->getArguments();
size_t I = 0;
auto Arg = CurFn->arg_begin();
for(; I < ArgsList.size(); ++Arg, ++I) {
auto ArgDecl = ArgsList[I];
auto Info = GetArgInfo(ArgDecl);
auto ABI = Info.ABIInfo.getKind();
if(ABI == ABIArgInfo::ExpandCharacterPutLengthToAdditionalArgsAsInt) {
ExpandedArg AArg;
AArg.Decl = ArgDecl;
AArg.A1 = Arg;
ExpandedArgs.push_back(AArg);
}
else
LocalVariables.insert(std::make_pair(ArgDecl, Arg));
Arg->setName(ArgDecl->getName());
if(ArgDecl->getType()->isArrayType() ||
ABI == ABIArgInfo::Reference) {
llvm::AttrBuilder Attributes;
Attributes.addAttribute(llvm::Attribute::NoAlias);
Arg->addAttr(llvm::AttributeSet::get(CGM.getLLVMContext(), 0, Attributes));
}
}
// Extra argument for the returned data.
auto RetABIKind = Info->getReturnInfo().ABIInfo.getKind();
if(RetABIKind == ABIRetInfo::CharacterValueAsArg ||
RetABIKind == ABIRetInfo::AggregateValueAsArg) {
Arg->setName(Func->getName());
ReturnValuePtr = Arg;
++Arg;
}
// Additional arguments.
for(I = 0; I < ExpandedArgs.size(); ++Arg, ++I) {
Arg->setName(llvm::Twine(ExpandedArgs[I].Decl->getName()) + ".length");
ExpandedArgs[I].A2 = Arg;
}
}
void CodeGenFunction::EmitFunctionPrologue(const FunctionDecl *Func,
const CGFunctionInfo *Info) {
EmitBlock(createBasicBlock("entry"));
// Extract argument values when necessary
for(auto Arg : ArgsList) {
if(Arg->getType()->isCharacterType())
GetCharacterArg(Arg);
}
// Create return value and lbock
auto RetABI = Info->getReturnInfo().ABIInfo.getKind();
if(RetABI == ABIRetInfo::Value) {
ReturnValuePtr = Builder.CreateAlloca(ConvertType(Func->getType()),
nullptr, Func->getName());
}
ReturnBlock = createBasicBlock("return");
}
void CodeGenFunction::EmitFunctionBody(const DeclContext *DC, const Stmt *S) {
EmitFunctionDecls(DC);
auto BodyBB = createBasicBlock("body");
AllocaInsertPt = Builder.CreateBr(BodyBB);
EmitBlock(BodyBB);
if(HasSavedVariables)
EmitFirstInvocationBlock(DC, S);
EmitVarInitializers(DC);
if(S)
EmitStmt(S);
}
void CodeGenFunction::EmitFirstInvocationBlock(const DeclContext *DC,
const Stmt *S) {
auto GlobalFirstInvocationFlag = CGM.EmitGlobalVariable(CurFn->getName(), "FIRST_INVOCATION",
CGM.Int1Ty, Builder.getTrue());
auto FirstInvocationBB = createBasicBlock("first-invocation");
auto EndBB = createBasicBlock("first-invocation-end");
Builder.CreateCondBr(Builder.CreateLoad(GlobalFirstInvocationFlag), FirstInvocationBB,
EndBB);
EmitBlock(FirstInvocationBB);
EmitSavedVarInitializers(DC);
Builder.CreateStore(Builder.getFalse(), GlobalFirstInvocationFlag);
EmitBlock(EndBB);
}
void CodeGenFunction::EmitCleanup() {
for(auto I : TempHeapAllocations)
CGM.getSystemRuntime().EmitFree(*this, I);
}
void CodeGenFunction::EmitFunctionEpilogue(const FunctionDecl *Func,
const CGFunctionInfo *Info) {
EmitBlock(ReturnBlock);
EmitCleanup();
// return
if(auto RetVar = GetRetVarPtr()) {
auto ReturnInfo = Info->getReturnInfo();
if(ReturnInfo.ABIInfo.getKind() == ABIRetInfo::Value) {
if(ReturnInfo.Type->isComplexType() ||
ReturnInfo.Type->isRecordType()) {
EmitAggregateReturn(ReturnInfo, RetVar);
} else
Builder.CreateRet(Builder.CreateLoad(RetVar));
}
else Builder.CreateRetVoid();
} else
Builder.CreateRetVoid();
if(AssignedGotoDispatchBlock)
EmitAssignedGotoDispatcher();
}
llvm::Value *CodeGenFunction::GetVarPtr(const VarDecl *D) {
if(D->isFunctionResult())
return ReturnValuePtr;
return LocalVariables[D];
}
llvm::Value *CodeGenFunction::GetRetVarPtr() {
return ReturnValuePtr;
}
CGFunctionInfo::ArgInfo CodeGenFunction::GetArgInfo(const VarDecl *Arg) const {
for(size_t I = 0; I < ArgsList.size(); ++I) {
if(ArgsList[I] == Arg) return ArgsInfo[I];
}
assert(false && "Invalid argument");
return CGFunctionInfo::ArgInfo();
}
const VarDecl *CodeGenFunction::GetExternalFunctionArgument(const FunctionDecl *Func) {
for(auto Arg : ArgsList) {
if(auto FType = Arg->getType()->asFunctionType()) {
if(FType->getPrototype() == Func)
return Arg;
}
}
llvm_unreachable("invalid external function argument");
return nullptr;
}
llvm::Value *CodeGenFunction::CreateTempHeapAlloca(llvm::Value *Size) {
auto P = CGM.getSystemRuntime().EmitMalloc(*this, Size->getType() != CGM.SizeTy?
Builder.CreateZExtOrTrunc(Size, CGM.SizeTy) : Size);
TempHeapAllocations.push_back(P);
return P;
}
llvm::Value *CodeGenFunction::CreateTempHeapAlloca(llvm::Value *Size, llvm::Type *PtrType) {
auto P = CreateTempHeapAlloca(Size);
return P->getType() != PtrType? Builder.CreateBitCast(P, PtrType) : P;
}
llvm::Value *CodeGenFunction::GetIntrinsicFunction(int FuncID,
ArrayRef<llvm::Type*> ArgTypes) const {
return llvm::Intrinsic::getDeclaration(&CGM.getModule(),
(llvm::Intrinsic::ID)FuncID,
ArgTypes);
}
llvm::Value *CodeGenFunction::GetIntrinsicFunction(int FuncID,
llvm::Type *T1) const {
return llvm::Intrinsic::getDeclaration(&CGM.getModule(),
(llvm::Intrinsic::ID)FuncID,
T1);
}
llvm::Value *CodeGenFunction::GetIntrinsicFunction(int FuncID,
llvm::Type *T1, llvm::Type *T2) const {
llvm::Type *ArgTypes[2] = {T1, T2};
return llvm::Intrinsic::getDeclaration(&CGM.getModule(),
(llvm::Intrinsic::ID)FuncID,
ArrayRef<llvm::Type*>(ArgTypes,2));
}
llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) const {
return CGM.getTypes().ConvertTypeForMem(T);
}
llvm::Type *CodeGenFunction::ConvertType(QualType T) const {
return CGM.getTypes().ConvertType(T);
}
} // end namespace CodeGen
} // end namespace flang
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