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cbackend.cpp
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//===-- CBackend.cpp - Library for converting LLVM code to C --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This library converts LLVM code to C code, compilable by GCC and other C
// compilers.
//
//===----------------------------------------------------------------------===//
#include "ispc.h"
#include "module.h"
#include <stdio.h>
#ifndef _MSC_VER
#include <inttypes.h>
#define HAVE_PRINTF_A 1
#define ENABLE_CBE_PRINTF_A 1
#endif
#ifndef PRIx64
#define PRIx64 "llx"
#endif
#include "llvmutil.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/PassManager.h"
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/InlineAsm.h"
#if !defined(LLVM_3_0) && !defined(LLVM_3_1)
#include "llvm/TypeFinder.h"
#endif // LLVM_3_2 +
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/ConstantsScanner.h"
#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
//#include "llvm/Target/Mangler.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#if defined(LLVM_3_0) || defined(LLVM_3_1)
#include "llvm/Target/TargetData.h"
#else
#include "llvm/DataLayout.h"
#endif
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/Host.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Config/config.h"
#include <llvm/Transforms/IPO.h>
#include <llvm/Transforms/Utils/BasicBlockUtils.h>
#include <llvm/Support/ToolOutputFile.h>
#include <llvm/Assembly/PrintModulePass.h>
#include <algorithm>
// Some ms header decided to define setjmp as _setjmp, undo this for this file.
#ifdef _MSC_VER
#undef setjmp
#define snprintf _snprintf
#endif
// FIXME:
namespace {
/// TypeFinder - Walk over a module, identifying all of the types that are
/// used by the module.
class TypeFinder {
// To avoid walking constant expressions multiple times and other IR
// objects, we keep several helper maps.
llvm::DenseSet<const llvm::Value*> VisitedConstants;
llvm::DenseSet<llvm::Type*> VisitedTypes;
std::vector<llvm::ArrayType*> &ArrayTypes;
public:
TypeFinder(std::vector<llvm::ArrayType*> &t)
: ArrayTypes(t) {}
void run(const llvm::Module &M) {
// Get types from global variables.
for (llvm::Module::const_global_iterator I = M.global_begin(),
E = M.global_end(); I != E; ++I) {
incorporateType(I->getType());
if (I->hasInitializer())
incorporateValue(I->getInitializer());
}
// Get types from aliases.
for (llvm::Module::const_alias_iterator I = M.alias_begin(),
E = M.alias_end(); I != E; ++I) {
incorporateType(I->getType());
if (const llvm::Value *Aliasee = I->getAliasee())
incorporateValue(Aliasee);
}
llvm::SmallVector<std::pair<unsigned, llvm::MDNode*>, 4> MDForInst;
// Get types from functions.
for (llvm::Module::const_iterator FI = M.begin(), E = M.end(); FI != E; ++FI) {
incorporateType(FI->getType());
for (llvm::Function::const_iterator BB = FI->begin(), E = FI->end();
BB != E;++BB)
for (llvm::BasicBlock::const_iterator II = BB->begin(),
E = BB->end(); II != E; ++II) {
const llvm::Instruction &I = *II;
// Incorporate the type of the instruction and all its operands.
incorporateType(I.getType());
for (llvm::User::const_op_iterator OI = I.op_begin(), OE = I.op_end();
OI != OE; ++OI)
incorporateValue(*OI);
// Incorporate types hiding in metadata.
I.getAllMetadataOtherThanDebugLoc(MDForInst);
for (unsigned i = 0, e = MDForInst.size(); i != e; ++i)
incorporateMDNode(MDForInst[i].second);
MDForInst.clear();
}
}
for (llvm::Module::const_named_metadata_iterator I = M.named_metadata_begin(),
E = M.named_metadata_end(); I != E; ++I) {
const llvm::NamedMDNode *NMD = I;
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
incorporateMDNode(NMD->getOperand(i));
}
}
private:
void incorporateType(llvm::Type *Ty) {
// Check to see if we're already visited this type.
if (!VisitedTypes.insert(Ty).second)
return;
if (llvm::ArrayType *ATy = llvm::dyn_cast<llvm::ArrayType>(Ty))
ArrayTypes.push_back(ATy);
// Recursively walk all contained types.
for (llvm::Type::subtype_iterator I = Ty->subtype_begin(),
E = Ty->subtype_end(); I != E; ++I)
incorporateType(*I);
}
/// incorporateValue - This method is used to walk operand lists finding
/// types hiding in constant expressions and other operands that won't be
/// walked in other ways. GlobalValues, basic blocks, instructions, and
/// inst operands are all explicitly enumerated.
void incorporateValue(const llvm::Value *V) {
if (const llvm::MDNode *M = llvm::dyn_cast<llvm::MDNode>(V))
return incorporateMDNode(M);
if (!llvm::isa<llvm::Constant>(V) || llvm::isa<llvm::GlobalValue>(V)) return;
// Already visited?
if (!VisitedConstants.insert(V).second)
return;
// Check this type.
incorporateType(V->getType());
// Look in operands for types.
const llvm::User *U = llvm::cast<llvm::User>(V);
for (llvm::Constant::const_op_iterator I = U->op_begin(),
E = U->op_end(); I != E;++I)
incorporateValue(*I);
}
void incorporateMDNode(const llvm::MDNode *V) {
// Already visited?
if (!VisitedConstants.insert(V).second)
return;
// Look in operands for types.
for (unsigned i = 0, e = V->getNumOperands(); i != e; ++i)
if (llvm::Value *Op = V->getOperand(i))
incorporateValue(Op);
}
};
} // end anonymous namespace
static void findUsedArrayTypes(const llvm::Module *m, std::vector<llvm::ArrayType*> &t) {
TypeFinder(t).run(*m);
}
namespace {
class CBEMCAsmInfo : public llvm::MCAsmInfo {
public:
CBEMCAsmInfo() {
GlobalPrefix = "";
PrivateGlobalPrefix = "";
}
};
/// CWriter - This class is the main chunk of code that converts an LLVM
/// module to a C translation unit.
class CWriter : public llvm::FunctionPass, public llvm::InstVisitor<CWriter> {
llvm::formatted_raw_ostream &Out;
llvm::IntrinsicLowering *IL;
//llvm::Mangler *Mang;
llvm::LoopInfo *LI;
const llvm::Module *TheModule;
const llvm::MCAsmInfo* TAsm;
const llvm::MCRegisterInfo *MRI;
const llvm::MCObjectFileInfo *MOFI;
llvm::MCContext *TCtx;
#if defined(LLVM_3_0) || defined(LLVM_3_1)
const llvm::TargetData* TD;
#else
// FIXME: it's ugly to have the name be "TD" here, but it saves us
// lots of ifdefs in the below since the new DataLayout and the old
// TargetData have generally similar interfaces...
const llvm::DataLayout* TD;
#endif
std::map<const llvm::ConstantFP *, unsigned> FPConstantMap;
#ifndef LLVM_3_0
std::map<const llvm::ConstantDataVector *, unsigned> VectorConstantMap;
unsigned VectorConstantIndex;
#endif // !LLVM_3_0
std::set<llvm::Function*> intrinsicPrototypesAlreadyGenerated;
std::set<const llvm::Argument*> ByValParams;
unsigned FPCounter;
unsigned OpaqueCounter;
llvm::DenseMap<const llvm::Value*, unsigned> AnonValueNumbers;
unsigned NextAnonValueNumber;
std::string includeName;
int vectorWidth;
/// UnnamedStructIDs - This contains a unique ID for each struct that is
/// either anonymous or has no name.
llvm::DenseMap<llvm::StructType*, unsigned> UnnamedStructIDs;
llvm::DenseMap<llvm::ArrayType *, unsigned> ArrayIDs;
public:
static char ID;
explicit CWriter(llvm::formatted_raw_ostream &o, const char *incname,
int vecwidth)
: FunctionPass(ID), Out(o), IL(0), /* Mang(0), */ LI(0),
TheModule(0), TAsm(0), MRI(0), MOFI(0), TCtx(0), TD(0),
OpaqueCounter(0), NextAnonValueNumber(0),
includeName(incname ? incname : "generic_defs.h"),
vectorWidth(vecwidth) {
initializeLoopInfoPass(*llvm::PassRegistry::getPassRegistry());
FPCounter = 0;
#ifndef LLVM_3_0
VectorConstantIndex = 0;
#endif // !LLVM_3_0
}
virtual const char *getPassName() const { return "C backend"; }
void getAnalysisUsage(llvm::AnalysisUsage &AU) const {
AU.addRequired<llvm::LoopInfo>();
AU.setPreservesAll();
}
virtual bool doInitialization(llvm::Module &M);
bool runOnFunction(llvm::Function &F) {
// Do not codegen any 'available_externally' functions at all, they have
// definitions outside the translation unit.
if (F.hasAvailableExternallyLinkage())
return false;
LI = &getAnalysis<llvm::LoopInfo>();
// Get rid of intrinsics we can't handle.
lowerIntrinsics(F);
// Output all floating point constants that cannot be printed accurately.
printFloatingPointConstants(F);
// Output all vector constants so they can be accessed with single
// vector loads
printVectorConstants(F);
printFunction(F);
return false;
}
virtual bool doFinalization(llvm::Module &M) {
// Free memory...
delete IL;
delete TD;
//delete Mang;
delete TCtx;
delete TAsm;
delete MRI;
delete MOFI;
FPConstantMap.clear();
#ifndef LLVM_3_0
VectorConstantMap.clear();
#endif // !LLVM_3_0
ByValParams.clear();
intrinsicPrototypesAlreadyGenerated.clear();
UnnamedStructIDs.clear();
ArrayIDs.clear();
return false;
}
llvm::raw_ostream &printType(llvm::raw_ostream &Out, llvm::Type *Ty,
bool isSigned = false,
const std::string &VariableName = "",
bool IgnoreName = false,
const llvm::AttrListPtr &PAL = llvm::AttrListPtr());
llvm::raw_ostream &printSimpleType(llvm::raw_ostream &Out, llvm::Type *Ty,
bool isSigned,
const std::string &NameSoFar = "");
void printStructReturnPointerFunctionType(llvm::raw_ostream &Out,
const llvm::AttrListPtr &PAL,
llvm::PointerType *Ty);
std::string getStructName(llvm::StructType *ST);
std::string getArrayName(llvm::ArrayType *AT);
/// writeOperandDeref - Print the result of dereferencing the specified
/// operand with '*'. This is equivalent to printing '*' then using
/// writeOperand, but avoids excess syntax in some cases.
void writeOperandDeref(llvm::Value *Operand) {
if (isAddressExposed(Operand)) {
// Already something with an address exposed.
writeOperandInternal(Operand);
} else {
Out << "*(";
writeOperand(Operand);
Out << ")";
}
}
void writeOperand(llvm::Value *Operand, bool Static = false);
void writeInstComputationInline(llvm::Instruction &I);
void writeOperandInternal(llvm::Value *Operand, bool Static = false);
void writeOperandWithCast(llvm::Value* Operand, unsigned Opcode);
void writeOperandWithCast(llvm::Value* Operand, const llvm::ICmpInst &I);
bool writeInstructionCast(const llvm::Instruction &I);
void writeMemoryAccess(llvm::Value *Operand, llvm::Type *OperandType,
bool IsVolatile, unsigned Alignment);
private :
void lowerIntrinsics(llvm::Function &F);
/// Prints the definition of the intrinsic function F. Supports the
/// intrinsics which need to be explicitly defined in the CBackend.
void printIntrinsicDefinition(const llvm::Function &F, llvm::raw_ostream &Out);
void printModuleTypes();
void printContainedStructs(llvm::Type *Ty, llvm::SmallPtrSet<llvm::Type *, 16> &);
void printContainedArrays(llvm::ArrayType *ATy, llvm::SmallPtrSet<llvm::Type *, 16> &);
void printFloatingPointConstants(llvm::Function &F);
void printFloatingPointConstants(const llvm::Constant *C);
void printVectorConstants(llvm::Function &F);
void printFunctionSignature(const llvm::Function *F, bool Prototype);
void printFunction(llvm::Function &);
void printBasicBlock(llvm::BasicBlock *BB);
void printLoop(llvm::Loop *L);
bool printCast(unsigned opcode, llvm::Type *SrcTy, llvm::Type *DstTy);
void printConstant(llvm::Constant *CPV, bool Static);
void printConstantWithCast(llvm::Constant *CPV, unsigned Opcode);
bool printConstExprCast(const llvm::ConstantExpr *CE, bool Static);
void printConstantArray(llvm::ConstantArray *CPA, bool Static);
void printConstantVector(llvm::ConstantVector *CV, bool Static);
#ifndef LLVM_3_0
void printConstantDataSequential(llvm::ConstantDataSequential *CDS, bool Static);
#endif
/// isAddressExposed - Return true if the specified value's name needs to
/// have its address taken in order to get a C value of the correct type.
/// This happens for global variables, byval parameters, and direct allocas.
bool isAddressExposed(const llvm::Value *V) const {
if (const llvm::Argument *A = llvm::dyn_cast<llvm::Argument>(V))
return ByValParams.count(A);
return llvm::isa<llvm::GlobalVariable>(V) || isDirectAlloca(V);
}
// isInlinableInst - Attempt to inline instructions into their uses to build
// trees as much as possible. To do this, we have to consistently decide
// what is acceptable to inline, so that variable declarations don't get
// printed and an extra copy of the expr is not emitted.
//
static bool isInlinableInst(const llvm::Instruction &I) {
// Always inline cmp instructions, even if they are shared by multiple
// expressions. GCC generates horrible code if we don't.
if (llvm::isa<llvm::CmpInst>(I) && llvm::isa<llvm::VectorType>(I.getType()) == false)
return true;
// Must be an expression, must be used exactly once. If it is dead, we
// emit it inline where it would go.
if (I.getType() == llvm::Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
llvm::isa<llvm::TerminatorInst>(I) || llvm::isa<llvm::CallInst>(I) || llvm::isa<llvm::PHINode>(I) ||
llvm::isa<llvm::LoadInst>(I) || llvm::isa<llvm::VAArgInst>(I) || llvm::isa<llvm::InsertElementInst>(I) ||
llvm::isa<llvm::InsertValueInst>(I) || llvm::isa<llvm::ExtractValueInst>(I) || llvm::isa<llvm::SelectInst>(I))
// Don't inline a load across a store or other bad things!
return false;
// Must not be used in inline asm, extractelement, or shufflevector.
if (I.hasOneUse()) {
const llvm::Instruction &User = llvm::cast<llvm::Instruction>(*I.use_back());
if (isInlineAsm(User) || llvm::isa<llvm::ExtractElementInst>(User) ||
llvm::isa<llvm::ShuffleVectorInst>(User) || llvm::isa<llvm::AtomicRMWInst>(User) ||
llvm::isa<llvm::AtomicCmpXchgInst>(User))
return false;
}
// Only inline instruction it if it's use is in the same BB as the inst.
return I.getParent() == llvm::cast<llvm::Instruction>(I.use_back())->getParent();
}
// isDirectAlloca - Define fixed sized allocas in the entry block as direct
// variables which are accessed with the & operator. This causes GCC to
// generate significantly better code than to emit alloca calls directly.
//
static const llvm::AllocaInst *isDirectAlloca(const llvm::Value *V) {
const llvm::AllocaInst *AI = llvm::dyn_cast<llvm::AllocaInst>(V);
if (!AI) return 0;
if (AI->isArrayAllocation())
return 0; // FIXME: we can also inline fixed size array allocas!
if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
return 0;
return AI;
}
// isInlineAsm - Check if the instruction is a call to an inline asm chunk.
static bool isInlineAsm(const llvm::Instruction& I) {
if (const llvm::CallInst *CI = llvm::dyn_cast<llvm::CallInst>(&I))
return llvm::isa<llvm::InlineAsm>(CI->getCalledValue());
return false;
}
// Instruction visitation functions
friend class llvm::InstVisitor<CWriter>;
void visitReturnInst(llvm::ReturnInst &I);
void visitBranchInst(llvm::BranchInst &I);
void visitSwitchInst(llvm::SwitchInst &I);
void visitIndirectBrInst(llvm::IndirectBrInst &I);
void visitInvokeInst(llvm::InvokeInst &I) {
llvm_unreachable("Lowerinvoke pass didn't work!");
}
#ifdef LLVM_3_0
void visitUnwindInst(llvm::UnwindInst &I) {
llvm_unreachable("Lowerinvoke pass didn't work!");
}
#endif // LLVM_3_0
void visitResumeInst(llvm::ResumeInst &I) {
llvm_unreachable("DwarfEHPrepare pass didn't work!");
}
void visitUnreachableInst(llvm::UnreachableInst &I);
void visitPHINode(llvm::PHINode &I);
void visitBinaryOperator(llvm::Instruction &I);
void visitICmpInst(llvm::ICmpInst &I);
void visitFCmpInst(llvm::FCmpInst &I);
void visitCastInst (llvm::CastInst &I);
void visitSelectInst(llvm::SelectInst &I);
void visitCallInst (llvm::CallInst &I);
void visitInlineAsm(llvm::CallInst &I);
bool visitBuiltinCall(llvm::CallInst &I, llvm::Intrinsic::ID ID, bool &WroteCallee);
void visitAllocaInst(llvm::AllocaInst &I);
void visitLoadInst (llvm::LoadInst &I);
void visitStoreInst (llvm::StoreInst &I);
void visitGetElementPtrInst(llvm::GetElementPtrInst &I);
void visitVAArgInst (llvm::VAArgInst &I);
void visitInsertElementInst(llvm::InsertElementInst &I);
void visitExtractElementInst(llvm::ExtractElementInst &I);
void visitShuffleVectorInst(llvm::ShuffleVectorInst &SVI);
void visitInsertValueInst(llvm::InsertValueInst &I);
void visitExtractValueInst(llvm::ExtractValueInst &I);
void visitAtomicRMWInst(llvm::AtomicRMWInst &I);
void visitAtomicCmpXchgInst(llvm::AtomicCmpXchgInst &I);
void visitInstruction(llvm::Instruction &I) {
#ifndef NDEBUG
llvm::errs() << "C Writer does not know about " << I;
#endif
llvm_unreachable(0);
}
void outputLValue(llvm::Instruction *I) {
Out << " " << GetValueName(I) << " = ";
}
bool isGotoCodeNecessary(llvm::BasicBlock *From, llvm::BasicBlock *To);
void printPHICopiesForSuccessor(llvm::BasicBlock *CurBlock,
llvm::BasicBlock *Successor, unsigned Indent);
void printBranchToBlock(llvm::BasicBlock *CurBlock, llvm::BasicBlock *SuccBlock,
unsigned Indent);
void printGEPExpression(llvm::Value *Ptr, llvm::gep_type_iterator I,
llvm::gep_type_iterator E, bool Static);
std::string GetValueName(const llvm::Value *Operand);
};
}
char CWriter::ID = 0;
static std::string CBEMangle(const std::string &S) {
std::string Result;
for (unsigned i = 0, e = S.size(); i != e; ++i)
if (isalnum(S[i]) || S[i] == '_' || S[i] == '<' || S[i] == '>') {
Result += S[i];
} else {
Result += '_';
Result += 'A'+(S[i]&15);
Result += 'A'+((S[i]>>4)&15);
Result += '_';
}
return Result;
}
std::string CWriter::getStructName(llvm::StructType *ST) {
if (!ST->isLiteral() && !ST->getName().empty())
return CBEMangle("l_"+ST->getName().str());
return "l_unnamed_" + llvm::utostr(UnnamedStructIDs[ST]);
}
std::string CWriter::getArrayName(llvm::ArrayType *AT) {
return "l_array_" + llvm::utostr(ArrayIDs[AT]);
}
/// printStructReturnPointerFunctionType - This is like printType for a struct
/// return type, except, instead of printing the type as void (*)(Struct*, ...)
/// print it as "Struct (*)(...)", for struct return functions.
void CWriter::printStructReturnPointerFunctionType(llvm::raw_ostream &Out,
const llvm::AttrListPtr &PAL,
llvm::PointerType *TheTy) {
llvm::FunctionType *FTy = llvm::cast<llvm::FunctionType>(TheTy->getElementType());
std::string tstr;
llvm::raw_string_ostream FunctionInnards(tstr);
FunctionInnards << " (*) (";
bool PrintedType = false;
llvm::FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
llvm::Type *RetTy = llvm::cast<llvm::PointerType>(*I)->getElementType();
unsigned Idx = 1;
for (++I, ++Idx; I != E; ++I, ++Idx) {
if (PrintedType)
FunctionInnards << ", ";
llvm::Type *ArgTy = *I;
#if defined(LLVM_3_0) || defined(LLVM_3_1)
if (PAL.paramHasAttr(Idx, llvm::Attribute::ByVal)) {
#else
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::ByVal)) {
#endif
assert(ArgTy->isPointerTy());
ArgTy = llvm::cast<llvm::PointerType>(ArgTy)->getElementType();
}
printType(FunctionInnards, ArgTy,
#if defined(LLVM_3_0) || defined(LLVM_3_1)
/*isSigned=*/PAL.paramHasAttr(Idx, llvm::Attribute::SExt),
#else
PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::SExt),
#endif
"");
PrintedType = true;
}
if (FTy->isVarArg()) {
if (!PrintedType)
FunctionInnards << " int"; //dummy argument for empty vararg functs
FunctionInnards << ", ...";
} else if (!PrintedType) {
FunctionInnards << "void";
}
FunctionInnards << ')';
printType(Out, RetTy,
#if defined(LLVM_3_0) || defined(LLVM_3_1)
/*isSigned=*/PAL.paramHasAttr(0, llvm::Attribute::SExt),
#else
PAL.getParamAttributes(0).hasAttribute(llvm::Attributes::SExt),
#endif
FunctionInnards.str());
}
llvm::raw_ostream &
CWriter::printSimpleType(llvm::raw_ostream &Out, llvm::Type *Ty, bool isSigned,
const std::string &NameSoFar) {
assert((Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) &&
"Invalid type for printSimpleType");
switch (Ty->getTypeID()) {
case llvm::Type::VoidTyID: return Out << "void " << NameSoFar;
case llvm::Type::IntegerTyID: {
unsigned NumBits = llvm::cast<llvm::IntegerType>(Ty)->getBitWidth();
if (NumBits == 1)
return Out << "bool " << NameSoFar;
else if (NumBits <= 8)
return Out << (isSigned?"":"u") << "int8_t " << NameSoFar;
else if (NumBits <= 16)
return Out << (isSigned?"":"u") << "int16_t " << NameSoFar;
else if (NumBits <= 32)
return Out << (isSigned?"":"u") << "int32_t " << NameSoFar;
else if (NumBits <= 64)
return Out << (isSigned?"":"u") << "int64_t "<< NameSoFar;
else {
assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
}
}
case llvm::Type::FloatTyID: return Out << "float " << NameSoFar;
case llvm::Type::DoubleTyID: return Out << "double " << NameSoFar;
// Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
// present matches host 'long double'.
case llvm::Type::X86_FP80TyID:
case llvm::Type::PPC_FP128TyID:
case llvm::Type::FP128TyID: return Out << "long double " << NameSoFar;
case llvm::Type::X86_MMXTyID:
return printSimpleType(Out, llvm::Type::getInt32Ty(Ty->getContext()), isSigned,
" __attribute__((vector_size(64))) " + NameSoFar);
case llvm::Type::VectorTyID: {
llvm::VectorType *VTy = llvm::cast<llvm::VectorType>(Ty);
#if 1
const char *suffix = NULL;
const llvm::Type *eltTy = VTy->getElementType();
if (eltTy->isFloatTy())
suffix = "f";
else if (eltTy->isDoubleTy())
suffix = "d";
else {
assert(eltTy->isIntegerTy());
switch (eltTy->getPrimitiveSizeInBits()) {
case 1:
suffix = "i1";
break;
case 8:
suffix = "i8";
break;
case 16:
suffix = "i16";
break;
case 32:
suffix = "i32";
break;
case 64:
suffix = "i64";
break;
default:
llvm::report_fatal_error("Only integer types of size 8/16/32/64 are "
"supported by the C++ backend.");
}
}
return Out << "__vec" << VTy->getNumElements() << "_" << suffix << " " <<
NameSoFar;
#else
return printSimpleType(Out, VTy->getElementType(), isSigned,
" __attribute__((vector_size(" +
utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
#endif
}
default:
#ifndef NDEBUG
llvm::errs() << "Unknown primitive type: " << *Ty << "\n";
#endif
llvm_unreachable(0);
}
}
// Pass the Type* and the variable name and this prints out the variable
// declaration.
//
llvm::raw_ostream &CWriter::printType(llvm::raw_ostream &Out, llvm::Type *Ty,
bool isSigned, const std::string &NameSoFar,
bool IgnoreName, const llvm::AttrListPtr &PAL) {
if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
printSimpleType(Out, Ty, isSigned, NameSoFar);
return Out;
}
switch (Ty->getTypeID()) {
case llvm::Type::FunctionTyID: {
llvm::FunctionType *FTy = llvm::cast<llvm::FunctionType>(Ty);
std::string tstr;
llvm::raw_string_ostream FunctionInnards(tstr);
FunctionInnards << " (" << NameSoFar << ") (";
unsigned Idx = 1;
for (llvm::FunctionType::param_iterator I = FTy->param_begin(),
E = FTy->param_end(); I != E; ++I) {
llvm::Type *ArgTy = *I;
#if defined(LLVM_3_0) || defined(LLVM_3_1)
if (PAL.paramHasAttr(Idx, llvm::Attribute::ByVal)) {
#else
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::ByVal)) {
#endif
assert(ArgTy->isPointerTy());
ArgTy = llvm::cast<llvm::PointerType>(ArgTy)->getElementType();
}
if (I != FTy->param_begin())
FunctionInnards << ", ";
printType(FunctionInnards, ArgTy,
#if defined(LLVM_3_0) || defined(LLVM_3_1)
/*isSigned=*/PAL.paramHasAttr(Idx, llvm::Attribute::SExt),
#else
PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::SExt),
#endif
"");
++Idx;
}
if (FTy->isVarArg()) {
if (!FTy->getNumParams())
FunctionInnards << " int"; //dummy argument for empty vaarg functs
FunctionInnards << ", ...";
} else if (!FTy->getNumParams()) {
FunctionInnards << "void";
}
FunctionInnards << ')';
printType(Out, FTy->getReturnType(),
#if defined(LLVM_3_0) || defined(LLVM_3_1)
/*isSigned=*/PAL.paramHasAttr(0, llvm::Attribute::SExt),
#else
PAL.getParamAttributes(0).hasAttribute(llvm::Attributes::SExt),
#endif
FunctionInnards.str());
return Out;
}
case llvm::Type::StructTyID: {
llvm::StructType *STy = llvm::cast<llvm::StructType>(Ty);
// Check to see if the type is named.
if (!IgnoreName)
return Out << getStructName(STy) << ' ' << NameSoFar;
Out << "struct " << NameSoFar << " {\n";
// print initialization func
if (STy->getNumElements() > 0) {
Out << " static " << NameSoFar << " init(";
unsigned Idx = 0;
for (llvm::StructType::element_iterator I = STy->element_begin(),
E = STy->element_end(); I != E; ++I, ++Idx) {
char buf[64];
sprintf(buf, "v%d", Idx);
printType(Out, *I, false, buf);
if (Idx + 1 < STy->getNumElements())
Out << ", ";
}
Out << ") {\n";
Out << " " << NameSoFar << " ret;\n";
for (Idx = 0; Idx < STy->getNumElements(); ++Idx)
Out << " ret.field" << Idx << " = v" << Idx << ";\n";
Out << " return ret;\n";
Out << " }\n";
}
unsigned Idx = 0;
for (llvm::StructType::element_iterator I = STy->element_begin(),
E = STy->element_end(); I != E; ++I) {
Out << " ";
printType(Out, *I, false, "field" + llvm::utostr(Idx++));
Out << ";\n";
}
Out << '}';
if (STy->isPacked())
Out << " __attribute__ ((packed))";
return Out;
}
case llvm::Type::PointerTyID: {
llvm::PointerType *PTy = llvm::cast<llvm::PointerType>(Ty);
std::string ptrName = "*" + NameSoFar;
if (PTy->getElementType()->isArrayTy() ||
PTy->getElementType()->isVectorTy())
ptrName = "(" + ptrName + ")";
if (!PAL.isEmpty())
// Must be a function ptr cast!
return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
return printType(Out, PTy->getElementType(), false, ptrName);
}
case llvm::Type::ArrayTyID: {
llvm::ArrayType *ATy = llvm::cast<llvm::ArrayType>(Ty);
// Check to see if the type is named.
if (!IgnoreName)
return Out << getArrayName(ATy) << ' ' << NameSoFar;
unsigned NumElements = (unsigned)ATy->getNumElements();
if (NumElements == 0) NumElements = 1;
// Arrays are wrapped in structs to allow them to have normal
// value semantics (avoiding the array "decay").
Out << "struct " << NameSoFar << " {\n";
// init func
Out << " static " << NameSoFar << " init(";
for (unsigned Idx = 0; Idx < NumElements; ++Idx) {
char buf[64];
sprintf(buf, "v%d", Idx);
printType(Out, ATy->getElementType(), false, buf);
if (Idx + 1 < NumElements)
Out << ", ";
}
Out << ") {\n";
Out << " " << NameSoFar << " ret;\n";
for (unsigned Idx = 0; Idx < NumElements; ++Idx)
Out << " ret.array[" << Idx << "] = v" << Idx << ";\n";
Out << " return ret;\n";
Out << " }\n ";
// if it's an array of i8s, also provide a version that takes a const
// char *
if (ATy->getElementType() == LLVMTypes::Int8Type) {
Out << " static " << NameSoFar << " init(const char *p) {\n";
Out << " " << NameSoFar << " ret;\n";
Out << " memcpy((uint8_t *)ret.array, (uint8_t *)p, " << NumElements << ");\n";
Out << " return ret;\n";
Out << " }\n";
}
printType(Out, ATy->getElementType(), false,
"array[" + llvm::utostr(NumElements) + "]");
return Out << ";\n} ";
}
default:
llvm_unreachable("Unhandled case in getTypeProps!");
}
}
void CWriter::printConstantArray(llvm::ConstantArray *CPA, bool Static) {
#ifdef LLVM_3_0
llvm::Type *ETy = CPA->getType()->getElementType();
// MMP: this looks like a bug: both sides of the || are the same
bool isString = ETy == llvm::Type::getInt8Ty(CPA->getContext());
// Make sure the last character is a null char, as automatically added by C
if (isString && (CPA->getNumOperands() == 0 ||
!llvm::cast<llvm::Constant>(*(CPA->op_end()-1))->isNullValue()))
isString = false;
if (isString) {
Out << "\"";
// Keep track of whether the last number was a hexadecimal escape.
bool LastWasHex = false;
// Do not include the last character, which we know is null
for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
unsigned char C = (unsigned char)(llvm::cast<llvm::ConstantInt>(CPA->getOperand(i))->getZExtValue());
// Print it out literally if it is a printable character. The only thing
// to be careful about is when the last letter output was a hex escape
// code, in which case we have to be careful not to print out hex digits
// explicitly (the C compiler thinks it is a continuation of the previous
// character, sheesh...)
//
if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
LastWasHex = false;
if (C == '"' || C == '\\')
Out << "\\" << (char)C;
else
Out << (char)C;
} else {
LastWasHex = false;
switch (C) {
case '\n': Out << "\\n"; break;
case '\t': Out << "\\t"; break;
case '\r': Out << "\\r"; break;
case '\v': Out << "\\v"; break;
case '\a': Out << "\\a"; break;
case '\"': Out << "\\\""; break;
case '\'': Out << "\\\'"; break;
default:
Out << "\\x";
Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
LastWasHex = true;
break;
}
}
}
Out << "\"";
return;
}
#endif // LLVM_3_0
printConstant(llvm::cast<llvm::Constant>(CPA->getOperand(0)), Static);
for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
Out << ", ";
printConstant(llvm::cast<llvm::Constant>(CPA->getOperand(i)), Static);
}
}
void CWriter::printConstantVector(llvm::ConstantVector *CP, bool Static) {
printConstant(llvm::cast<llvm::Constant>(CP->getOperand(0)), Static);
for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
Out << ", ";
printConstant(llvm::cast<llvm::Constant>(CP->getOperand(i)), Static);
}
}
#ifndef LLVM_3_0
void CWriter::printConstantDataSequential(llvm::ConstantDataSequential *CDS,
bool Static) {
// As a special case, print the array as a string if it is an array of
// ubytes or an array of sbytes with positive values.
//
if (CDS->isCString()) {
Out << '\"';
// Keep track of whether the last number was a hexadecimal escape.
bool LastWasHex = false;
llvm::StringRef Bytes = CDS->getAsCString();
// Do not include the last character, which we know is null
for (unsigned i = 0, e = Bytes.size(); i != e; ++i) {
unsigned char C = Bytes[i];
// Print it out literally if it is a printable character. The only thing
// to be careful about is when the last letter output was a hex escape
// code, in which case we have to be careful not to print out hex digits
// explicitly (the C compiler thinks it is a continuation of the previous
// character, sheesh...)
//
if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
LastWasHex = false;
if (C == '"' || C == '\\')
Out << "\\" << (char)C;
else
Out << (char)C;
} else {
LastWasHex = false;
switch (C) {
case '\n': Out << "\\n"; break;
case '\t': Out << "\\t"; break;
case '\r': Out << "\\r"; break;
case '\v': Out << "\\v"; break;
case '\a': Out << "\\a"; break;
case '\"': Out << "\\\""; break;
case '\'': Out << "\\\'"; break;
default:
Out << "\\x";
Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
LastWasHex = true;
break;
}
}
}
Out << '\"';
} else {
printConstant(CDS->getElementAsConstant(0), Static);
for (unsigned i = 1, e = CDS->getNumElements(); i != e; ++i) {
Out << ", ";
printConstant(CDS->getElementAsConstant(i), Static);
}
}
}
#endif // !LLVM_3_0
#ifndef LLVM_3_0
static inline std::string ftostr(const llvm::APFloat& V) {
std::string Buf;
if (&V.getSemantics() == &llvm::APFloat::IEEEdouble) {
llvm::raw_string_ostream(Buf) << V.convertToDouble();
return Buf;
} else if (&V.getSemantics() == &llvm::APFloat::IEEEsingle) {
llvm::raw_string_ostream(Buf) << (double)V.convertToFloat();
return Buf;