//===----------------------------------------------------------------------===//
#include "CTargetMachine.h"
-#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/SymbolTable.h"
#include "llvm/Intrinsics.h"
-#include "llvm/IntrinsicLowering.h"
-#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Analysis/ConstantsScanner.h"
+#include "llvm/Analysis/FindUsedTypes.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/Transforms/Scalar.h"
+#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/Mangler.h"
-#include "Support/StringExtras.h"
-#include "Config/config.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Config/config.h"
#include <algorithm>
+#include <iostream>
#include <sstream>
using namespace llvm;
namespace {
- class CWriter : public Pass, public InstVisitor<CWriter> {
+ // Register the target.
+ RegisterTarget<CTargetMachine> X("c", " C backend");
+
+ /// NameAllUsedStructs - This pass inserts names for any unnamed structure
+ /// types that are used by the program.
+ ///
+ class CBackendNameAllUsedStructs : public Pass {
+ void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<FindUsedTypes>();
+ }
+
+ virtual const char *getPassName() const {
+ return "C backend type canonicalizer";
+ }
+
+ virtual bool run(Module &M);
+ };
+
+ /// CWriter - This class is the main chunk of code that converts an LLVM
+ /// module to a C translation unit.
+ class CWriter : public FunctionPass, public InstVisitor<CWriter> {
std::ostream &Out;
IntrinsicLowering &IL;
Mangler *Mang;
+ LoopInfo *LI;
const Module *TheModule;
- FindUsedTypes *FUT;
-
std::map<const Type *, std::string> TypeNames;
std::map<const ConstantFP *, unsigned> FPConstantMap;
public:
CWriter(std::ostream &o, IntrinsicLowering &il) : Out(o), IL(il) {}
+ virtual const char *getPassName() const { return "C backend"; }
+
void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<FindUsedTypes>();
+ AU.addRequired<LoopInfo>();
+ AU.setPreservesAll();
}
- virtual const char *getPassName() const { return "C backend"; }
+ virtual bool doInitialization(Module &M);
- bool doInitialization(Module &M);
- bool run(Module &M) {
- // First pass, lower all unhandled intrinsics.
- lowerIntrinsics(M);
+ bool runOnFunction(Function &F) {
+ LI = &getAnalysis<LoopInfo>();
- doInitialization(M);
-
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- if (!I->isExternal())
- printFunction(*I);
+ // Output all floating point constants that cannot be printed accurately.
+ printFloatingPointConstants(F);
+
+ lowerIntrinsics(F);
+ printFunction(F);
+ FPConstantMap.clear();
+ return false;
+ }
+ virtual bool doFinalization(Module &M) {
// Free memory...
delete Mang;
TypeNames.clear();
- return true;
+ return false;
}
std::ostream &printType(std::ostream &Out, const Type *Ty,
void writeOperandInternal(Value *Operand);
private :
- void lowerIntrinsics(Module &M);
+ void lowerIntrinsics(Function &F);
bool nameAllUsedStructureTypes(Module &M);
void printModule(Module *M);
- void printFloatingPointConstants(Module &M);
- void printSymbolTable(const SymbolTable &ST);
+ void printModuleTypes(const SymbolTable &ST);
void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
+ void printFloatingPointConstants(Function &F);
void printFunctionSignature(const Function *F, bool Prototype);
void printFunction(Function &);
+ void printBasicBlock(BasicBlock *BB);
+ void printLoop(Loop *L);
void printConstant(Constant *CPV);
void printConstantArray(ConstantArray *CPA);
// printed and an extra copy of the expr is not emitted.
//
static bool isInlinableInst(const Instruction &I) {
+ // Always inline setcc instructions, even if they are shared by multiple
+ // expressions. GCC generates horrible code if we don't.
+ if (isa<SetCondInst>(I)) 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() == Type::VoidTy || !I.hasOneUse() ||
void visitReturnInst(ReturnInst &I);
void visitBranchInst(BranchInst &I);
void visitSwitchInst(SwitchInst &I);
- void visitInvokeInst(InvokeInst &I);
- void visitUnwindInst(UnwindInst &I);
+ void visitInvokeInst(InvokeInst &I) {
+ assert(0 && "Lowerinvoke pass didn't work!");
+ }
+
+ void visitUnwindInst(UnwindInst &I) {
+ assert(0 && "Lowerinvoke pass didn't work!");
+ }
void visitPHINode(PHINode &I);
void visitBinaryOperator(Instruction &I);
void outputLValue(Instruction *I) {
Out << " " << Mang->getValueName(I) << " = ";
}
+
+ bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
void printPHICopiesForSuccessors(BasicBlock *CurBlock,
unsigned Indent);
void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
};
}
+/// This method inserts names for any unnamed structure types that are used by
+/// the program, and removes names from structure types that are not used by the
+/// program.
+///
+bool CBackendNameAllUsedStructs::run(Module &M) {
+ // Get a set of types that are used by the program...
+ std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
+
+ // Loop over the module symbol table, removing types from UT that are
+ // already named, and removing names for structure types that are not used.
+ //
+ SymbolTable &MST = M.getSymbolTable();
+ for (SymbolTable::type_iterator TI = MST.type_begin(), TE = MST.type_end();
+ TI != TE; ) {
+ SymbolTable::type_iterator I = TI++;
+ if (const StructType *STy = dyn_cast<StructType>(I->second)) {
+ // If this is not used, remove it from the symbol table.
+ std::set<const Type *>::iterator UTI = UT.find(STy);
+ if (UTI == UT.end())
+ MST.remove(I);
+ else
+ UT.erase(UTI);
+ }
+ }
+
+ // UT now contains types that are not named. Loop over it, naming
+ // structure types.
+ //
+ bool Changed = false;
+ unsigned RenameCounter = 0;
+ for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
+ I != E; ++I)
+ if (const StructType *ST = dyn_cast<StructType>(*I)) {
+ while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
+ ++RenameCounter;
+ Changed = true;
+ }
+ return Changed;
+}
+
+
// Pass the Type* and the variable name and this prints out the variable
// declaration.
//
const std::string &NameSoFar,
bool IgnoreName) {
if (Ty->isPrimitiveType())
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
case Type::VoidTyID: return Out << "void " << NameSoFar;
case Type::BoolTyID: return Out << "bool " << NameSoFar;
case Type::UByteTyID: return Out << "unsigned char " << NameSoFar;
case Type::FloatTyID: return Out << "float " << NameSoFar;
case Type::DoubleTyID: return Out << "double " << NameSoFar;
default :
- std::cerr << "Unknown primitive type: " << Ty << "\n";
+ std::cerr << "Unknown primitive type: " << *Ty << "\n";
abort();
}
if (I != TypeNames.end()) return Out << I->second << " " << NameSoFar;
}
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
case Type::FunctionTyID: {
const FunctionType *MTy = cast<FunctionType>(Ty);
std::stringstream FunctionInnards;
}
if (MTy->isVarArg()) {
if (MTy->getNumParams())
- FunctionInnards << ", ...";
+ FunctionInnards << ", ...";
} else if (!MTy->getNumParams()) {
FunctionInnards << "void";
}
// compiler agreeing on the conversion process (which is pretty likely since we
// only deal in IEEE FP).
//
-bool isFPCSafeToPrint(const ConstantFP *CFP) {
+static bool isFPCSafeToPrint(const ConstantFP *CFP) {
#if HAVE_PRINTF_A
char Buffer[100];
sprintf(Buffer, "%a", CFP->getValue());
default:
std::cerr << "CWriter Error: Unhandled constant expression: "
- << CE << "\n";
+ << *CE << "\n";
abort();
}
}
- switch (CPV->getType()->getPrimitiveID()) {
+ switch (CPV->getType()->getTypeID()) {
case Type::BoolTyID:
Out << (CPV == ConstantBool::False ? "0" : "1"); break;
case Type::SByteTyID:
Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
<< "*)&FPConstant" << I->second << ")";
} else {
+ if (IsNAN(FPC->getValue())) {
+ // The value is NaN
+
+ // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
+ // it's 0x7ff4.
+ const unsigned long QuietNaN = 0x7ff8UL;
+ const unsigned long SignalNaN = 0x7ff4UL;
+
+ // We need to grab the first part of the FP #
+ union {
+ double d;
+ uint64_t ll;
+ } DHex;
+ char Buffer[100];
+
+ DHex.d = FPC->getValue();
+ sprintf(Buffer, "0x%llx", DHex.ll);
+
+ std::string Num(&Buffer[0], &Buffer[6]);
+ unsigned long Val = strtoul(Num.c_str(), 0, 16);
+
+ if (FPC->getType() == Type::FloatTy)
+ Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
+ << Buffer << "\") /*nan*/ ";
+ else
+ Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
+ << Buffer << "\") /*nan*/ ";
+ } else if (IsInf(FPC->getValue())) {
+ // The value is Inf
+ if (FPC->getValue() < 0) Out << "-";
+ Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
+ << " /*inf*/ ";
+ } else {
+ std::string Num;
#if HAVE_PRINTF_A
- // Print out the constant as a floating point number.
- char Buffer[100];
- sprintf(Buffer, "%a", FPC->getValue());
- Out << Buffer << " /*" << FPC->getValue() << "*/ ";
+ // Print out the constant as a floating point number.
+ char Buffer[100];
+ sprintf(Buffer, "%a", FPC->getValue());
+ Num = Buffer;
#else
- Out << ftostr(FPC->getValue());
+ Num = ftostr(FPC->getValue());
#endif
+ Out << Num;
+ }
}
break;
}
printType(Out, CPV->getType());
Out << ")/*NULL*/0)";
break;
- } else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CPV)) {
- writeOperand(CPR->getValue());
+ } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
+ writeOperand(GV);
break;
}
// FALL THROUGH
default:
- std::cerr << "Unknown constant type: " << CPV << "\n";
+ std::cerr << "Unknown constant type: " << *CPV << "\n";
abort();
}
}
return;
}
- if (Constant *CPV = dyn_cast<Constant>(Operand)) {
+ Constant* CPV = dyn_cast<Constant>(Operand);
+ if (CPV && !isa<GlobalValue>(CPV)) {
printConstant(CPV);
} else {
Out << Mang->getValueName(Operand);
Out << ")";
}
-// nameAllUsedStructureTypes - If there are structure types in the module that
-// are used but do not have names assigned to them in the symbol table yet then
-// we assign them names now.
-//
-bool CWriter::nameAllUsedStructureTypes(Module &M) {
- // Get a set of types that are used by the program...
- std::set<const Type *> UT = FUT->getTypes();
-
- // Loop over the module symbol table, removing types from UT that are already
- // named.
- //
- SymbolTable &MST = M.getSymbolTable();
- if (MST.find(Type::TypeTy) != MST.end())
- for (SymbolTable::type_iterator I = MST.type_begin(Type::TypeTy),
- E = MST.type_end(Type::TypeTy); I != E; ++I)
- UT.erase(cast<Type>(I->second));
-
- // UT now contains types that are not named. Loop over it, naming structure
- // types.
- //
- bool Changed = false;
- for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
- I != E; ++I)
- if (const StructType *ST = dyn_cast<StructType>(*I)) {
- ((Value*)ST)->setName("unnamed", &MST);
- Changed = true;
- }
- return Changed;
-}
-
// generateCompilerSpecificCode - This is where we add conditional compilation
// directives to cater to specific compilers as need be.
//
static void generateCompilerSpecificCode(std::ostream& Out) {
// Alloca is hard to get, and we don't want to include stdlib.h here...
Out << "/* get a declaration for alloca */\n"
- << "#ifdef sun\n"
+ << "#if defined(sun) || defined(__CYGWIN__) || defined(__APPLE__)\n"
<< "extern void *__builtin_alloca(unsigned long);\n"
<< "#define alloca(x) __builtin_alloca(x)\n"
<< "#else\n"
<< "#else\n"
<< "#define __ATTRIBUTE_WEAK__\n"
<< "#endif\n\n";
+
+ // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
+ // From the GCC documentation:
+ //
+ // double __builtin_nan (const char *str)
+ //
+ // This is an implementation of the ISO C99 function nan.
+ //
+ // Since ISO C99 defines this function in terms of strtod, which we do
+ // not implement, a description of the parsing is in order. The string is
+ // parsed as by strtol; that is, the base is recognized by leading 0 or
+ // 0x prefixes. The number parsed is placed in the significand such that
+ // the least significant bit of the number is at the least significant
+ // bit of the significand. The number is truncated to fit the significand
+ // field provided. The significand is forced to be a quiet NaN.
+ //
+ // This function, if given a string literal, is evaluated early enough
+ // that it is considered a compile-time constant.
+ //
+ // float __builtin_nanf (const char *str)
+ //
+ // Similar to __builtin_nan, except the return type is float.
+ //
+ // double __builtin_inf (void)
+ //
+ // Similar to __builtin_huge_val, except a warning is generated if the
+ // target floating-point format does not support infinities. This
+ // function is suitable for implementing the ISO C99 macro INFINITY.
+ //
+ // float __builtin_inff (void)
+ //
+ // Similar to __builtin_inf, except the return type is float.
+ Out << "#ifdef __GNUC__\n"
+ << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
+ << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
+ << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
+ << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
+ << "#define LLVM_INF __builtin_inf() /* Double */\n"
+ << "#define LLVM_INFF __builtin_inff() /* Float */\n"
+ << "#else\n"
+ << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
+ << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
+ << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
+ << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
+ << "#define LLVM_INF ((double)0.0) /* Double */\n"
+ << "#define LLVM_INFF 0.0F /* Float */\n"
+ << "#endif\n";
}
bool CWriter::doInitialization(Module &M) {
// Initialize
TheModule = &M;
- FUT = &getAnalysis<FindUsedTypes>();
+
+ IL.AddPrototypes(M);
// Ensure that all structure types have names...
- bool Changed = nameAllUsedStructureTypes(M);
Mang = new Mangler(M);
// get declaration for alloca
//
// Loop over the symbol table, emitting all named constants...
- printSymbolTable(M.getSymbolTable());
+ printModuleTypes(M.getSymbolTable());
// Global variable declarations...
if (!M.gempty()) {
Out << "\n/* Function Declarations */\n";
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
// Don't print declarations for intrinsic functions.
- if (!I->getIntrinsicID()) {
+ if (!I->getIntrinsicID() &&
+ I->getName() != "setjmp" && I->getName() != "longjmp") {
printFunctionSignature(I, true);
if (I->hasWeakLinkage()) Out << " __ATTRIBUTE_WEAK__";
if (I->hasLinkOnceLinkage()) Out << " __ATTRIBUTE_WEAK__";
}
}
- // Output all floating point constants that cannot be printed accurately...
- printFloatingPointConstants(M);
-
if (!M.empty())
Out << "\n\n/* Function Bodies */\n";
return false;
/// Output all floating point constants that cannot be printed accurately...
-void CWriter::printFloatingPointConstants(Module &M) {
+void CWriter::printFloatingPointConstants(Function &F) {
union {
double D;
- unsigned long long U;
+ uint64_t U;
} DBLUnion;
union {
// the precision of the printed form, unless the printed form preserves
// precision.
//
- unsigned FPCounter = 0;
- for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
- for (constant_iterator I = constant_begin(F), E = constant_end(F);
- I != E; ++I)
- if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
- if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
- !FPConstantMap.count(FPC)) {
- double Val = FPC->getValue();
-
- FPConstantMap[FPC] = FPCounter; // Number the FP constants
-
- if (FPC->getType() == Type::DoubleTy) {
- DBLUnion.D = Val;
- Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
- << " = 0x" << std::hex << DBLUnion.U << std::dec
- << "ULL; /* " << Val << " */\n";
- } else if (FPC->getType() == Type::FloatTy) {
- FLTUnion.F = Val;
- Out << "static const ConstantFloatTy FPConstant" << FPCounter++
- << " = 0x" << std::hex << FLTUnion.U << std::dec
- << "U; /* " << Val << " */\n";
- } else
- assert(0 && "Unknown float type!");
- }
+ static unsigned FPCounter = 0;
+ for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
+ I != E; ++I)
+ if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
+ if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
+ !FPConstantMap.count(FPC)) {
+ double Val = FPC->getValue();
+
+ FPConstantMap[FPC] = FPCounter; // Number the FP constants
+
+ if (FPC->getType() == Type::DoubleTy) {
+ DBLUnion.D = Val;
+ Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
+ << " = 0x" << std::hex << DBLUnion.U << std::dec
+ << "ULL; /* " << Val << " */\n";
+ } else if (FPC->getType() == Type::FloatTy) {
+ FLTUnion.F = Val;
+ Out << "static const ConstantFloatTy FPConstant" << FPCounter++
+ << " = 0x" << std::hex << FLTUnion.U << std::dec
+ << "U; /* " << Val << " */\n";
+ } else
+ assert(0 && "Unknown float type!");
+ }
Out << "\n";
- }
+}
/// printSymbolTable - Run through symbol table looking for type names. If a
/// type name is found, emit it's declaration...
///
-void CWriter::printSymbolTable(const SymbolTable &ST) {
+void CWriter::printModuleTypes(const SymbolTable &ST) {
// If there are no type names, exit early.
- if (ST.find(Type::TypeTy) == ST.end())
+ if ( ! ST.hasTypes() )
return;
// We are only interested in the type plane of the symbol table...
- SymbolTable::type_const_iterator I = ST.type_begin(Type::TypeTy);
- SymbolTable::type_const_iterator End = ST.type_end(Type::TypeTy);
+ SymbolTable::type_const_iterator I = ST.type_begin();
+ SymbolTable::type_const_iterator End = ST.type_end();
// Print out forward declarations for structure types before anything else!
Out << "/* Structure forward decls */\n";
for (; I != End; ++I)
- if (const Type *STy = dyn_cast<StructType>(I->second))
- // Only print out used types!
- if (FUT->getTypes().count(STy)) {
- std::string Name = "struct l_" + Mangler::makeNameProper(I->first);
- Out << Name << ";\n";
- TypeNames.insert(std::make_pair(STy, Name));
- }
+ if (const Type *STy = dyn_cast<StructType>(I->second)) {
+ std::string Name = "struct l_" + Mangler::makeNameProper(I->first);
+ Out << Name << ";\n";
+ TypeNames.insert(std::make_pair(STy, Name));
+ }
Out << "\n";
// Now we can print out typedefs...
Out << "/* Typedefs */\n";
- for (I = ST.type_begin(Type::TypeTy); I != End; ++I)
- // Only print out used types!
- if (FUT->getTypes().count(cast<Type>(I->second))) {
- const Type *Ty = cast<Type>(I->second);
- std::string Name = "l_" + Mangler::makeNameProper(I->first);
- Out << "typedef ";
- printType(Out, Ty, Name);
- Out << ";\n";
- }
+ for (I = ST.type_begin(); I != End; ++I) {
+ const Type *Ty = cast<Type>(I->second);
+ std::string Name = "l_" + Mangler::makeNameProper(I->first);
+ Out << "typedef ";
+ printType(Out, Ty, Name);
+ Out << ";\n";
+ }
Out << "\n";
// printed in the correct order.
//
Out << "/* Structure contents */\n";
- for (I = ST.type_begin(Type::TypeTy); I != End; ++I)
+ for (I = ST.type_begin(); I != End; ++I)
if (const StructType *STy = dyn_cast<StructType>(I->second))
// Only print out used types!
- if (FUT->getTypes().count(STy))
- printContainedStructs(STy, StructPrinted);
+ printContainedStructs(STy, StructPrinted);
}
// Push the struct onto the stack and recursively push all structs
} else {
// Loop over the arguments, printing them...
for (FunctionType::param_iterator I = FT->param_begin(),
- E = FT->param_end(); I != E; ++I) {
+ E = FT->param_end(); I != E; ++I) {
if (I != FT->param_begin()) FunctionInnards << ", ";
printType(FunctionInnards, *I);
}
// print the basic blocks
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
- BasicBlock *Prev = BB->getPrev();
+ if (Loop *L = LI->getLoopFor(BB)) {
+ if (L->getHeader() == BB && L->getParentLoop() == 0)
+ printLoop(L);
+ } else {
+ printBasicBlock(BB);
+ }
+ }
+
+ Out << "}\n\n";
+}
- // Don't print the label for the basic block if there are no uses, or if the
- // only terminator use is the predecessor basic block's terminator. We have
- // to scan the use list because PHI nodes use basic blocks too but do not
- // require a label to be generated.
- //
- bool NeedsLabel = false;
- for (Value::use_iterator UI = BB->use_begin(), UE = BB->use_end();
- UI != UE; ++UI)
- if (TerminatorInst *TI = dyn_cast<TerminatorInst>(*UI))
- if (TI != Prev->getTerminator() ||
- isa<SwitchInst>(Prev->getTerminator()) ||
- isa<InvokeInst>(Prev->getTerminator())) {
- NeedsLabel = true;
- break;
- }
+void CWriter::printLoop(Loop *L) {
+ Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
+ << "' to make GCC happy */\n";
+ for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
+ BasicBlock *BB = L->getBlocks()[i];
+ Loop *BBLoop = LI->getLoopFor(BB);
+ if (BBLoop == L)
+ printBasicBlock(BB);
+ else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
+ printLoop(BBLoop);
+ }
+ Out << " } while (1); /* end of syntactic loop '"
+ << L->getHeader()->getName() << "' */\n";
+}
- if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
+void CWriter::printBasicBlock(BasicBlock *BB) {
- // Output all of the instructions in the basic block...
- for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E; ++II){
- if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
- if (II->getType() != Type::VoidTy)
- outputLValue(II);
- else
- Out << " ";
- visit(*II);
- Out << ";\n";
- }
+ // Don't print the label for the basic block if there are no uses, or if
+ // the only terminator use is the predecessor basic block's terminator.
+ // We have to scan the use list because PHI nodes use basic blocks too but
+ // do not require a label to be generated.
+ //
+ bool NeedsLabel = false;
+ for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
+ if (isGotoCodeNecessary(*PI, BB)) {
+ NeedsLabel = true;
+ break;
+ }
+
+ if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
+
+ // Output all of the instructions in the basic block...
+ for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
+ ++II) {
+ if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
+ if (II->getType() != Type::VoidTy)
+ outputLValue(II);
+ else
+ Out << " ";
+ visit(*II);
+ Out << ";\n";
}
-
- // Don't emit prefix or suffix for the terminator...
- visit(*BB->getTerminator());
}
-
- Out << "}\n\n";
+
+ // Don't emit prefix or suffix for the terminator...
+ visit(*BB->getTerminator());
}
+
// Specific Instruction type classes... note that all of the casts are
// necessary because we use the instruction classes as opaque types...
//
Out << " }\n";
}
-void CWriter::visitInvokeInst(InvokeInst &II) {
- assert(0 && "Lowerinvoke pass didn't work!");
-}
+bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
+ /// FIXME: This should be reenabled, but loop reordering safe!!
+ return true;
+ if (From->getNext() != To) // Not the direct successor, we need a goto
+ return true;
-void CWriter::visitUnwindInst(UnwindInst &I) {
- assert(0 && "Lowerinvoke pass didn't work!");
-}
+ //isa<SwitchInst>(From->getTerminator())
-static bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
- // If PHI nodes need copies, we need the copy code...
- if (isa<PHINode>(To->front()) ||
- From->getNext() != To) // Not directly successor, need goto
- return true;
- // Otherwise we don't need the code.
+ if (LI->getLoopFor(From) != LI->getLoopFor(To))
+ return true;
return false;
}
void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
unsigned Indent) {
- if (CurBB->getNext() != Succ ||
- isa<InvokeInst>(CurBB->getTerminator()) ||
- isa<SwitchInst>(CurBB->getTerminator())) {
+ if (isGotoCodeNecessary(CurBB, Succ)) {
Out << std::string(Indent, ' ') << " goto ";
writeOperand(Succ);
Out << ";\n";
}
-void CWriter::lowerIntrinsics(Module &M) {
- for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
- for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
- if (CallInst *CI = dyn_cast<CallInst>(I++))
- if (Function *F = CI->getCalledFunction())
- switch (F->getIntrinsicID()) {
- case Intrinsic::not_intrinsic:
- case Intrinsic::vastart:
- case Intrinsic::vacopy:
- case Intrinsic::vaend:
- case Intrinsic::returnaddress:
- case Intrinsic::frameaddress:
- case Intrinsic::setjmp:
- case Intrinsic::longjmp:
- // We directly implement these intrinsics
- break;
- default:
- // All other intrinsic calls we must lower.
- Instruction *Before = CI->getPrev();
- IL.LowerIntrinsicCall(CI);
- if (Before) { // Move iterator to instruction after call
- I = Before; ++I;
- } else {
- I = BB->begin();
- }
+void CWriter::lowerIntrinsics(Function &F) {
+ for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
+ for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
+ if (CallInst *CI = dyn_cast<CallInst>(I++))
+ if (Function *F = CI->getCalledFunction())
+ switch (F->getIntrinsicID()) {
+ case Intrinsic::not_intrinsic:
+ case Intrinsic::vastart:
+ case Intrinsic::vacopy:
+ case Intrinsic::vaend:
+ case Intrinsic::returnaddress:
+ case Intrinsic::frameaddress:
+ case Intrinsic::setjmp:
+ case Intrinsic::longjmp:
+ // We directly implement these intrinsics
+ break;
+ default:
+ // All other intrinsic calls we must lower.
+ Instruction *Before = CI->getPrev();
+ IL.LowerIntrinsicCall(CI);
+ if (Before) { // Move iterator to instruction after call
+ I = Before; ++I;
+ } else {
+ I = BB->begin();
}
+ }
}
Out << ")";
return;
case Intrinsic::vaend:
- Out << "va_end(*(va_list*)&";
- writeOperand(I.getOperand(1));
- Out << ")";
+ if (!isa<ConstantPointerNull>(I.getOperand(1))) {
+ Out << "va_end(*(va_list*)&";
+ writeOperand(I.getOperand(1));
+ Out << ")";
+ } else {
+ Out << "va_end(*(va_list*)0)";
+ }
return;
case Intrinsic::vacopy:
Out << "0;";
// If accessing a global value with no indexing, avoid *(&GV) syndrome
if (GlobalValue *V = dyn_cast<GlobalValue>(Ptr)) {
HasImplicitAddress = true;
- } else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(Ptr)) {
- HasImplicitAddress = true;
- Ptr = CPR->getValue(); // Get to the global...
} else if (isDirectAlloca(Ptr)) {
HasImplicitAddress = true;
}
//===----------------------------------------------------------------------===//
bool CTargetMachine::addPassesToEmitAssembly(PassManager &PM, std::ostream &o) {
+ PM.add(createLowerGCPass());
PM.add(createLowerAllocationsPass());
PM.add(createLowerInvokePass());
+ PM.add(new CBackendNameAllUsedStructs());
PM.add(new CWriter(o, getIntrinsicLowering()));
return false;
}
-TargetMachine *llvm::allocateCTargetMachine(const Module &M,
- IntrinsicLowering *IL) {
- return new CTargetMachine(M, IL);
-}
+// vim: sw=2
projects / oota-llvm.git / blobdiff