//===----------------------------------------------------------------------===//
#include "CTargetMachine.h"
+#include "llvm/CallingConv.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/IntrinsicInst.h"
#include "llvm/Analysis/ConstantsScanner.h"
#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/Mangler.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Config/config.h"
#include <algorithm>
#include <iostream>
+#include <ios>
#include <sstream>
using namespace llvm;
// 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.
+ /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
+ /// any unnamed structure types that are used by the program, and merges
+ /// external functions with the same name.
///
- class CBackendNameAllUsedStructs : public ModulePass {
+ class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<FindUsedTypes>();
}
/// module to a C translation unit.
class CWriter : public FunctionPass, public InstVisitor<CWriter> {
std::ostream &Out;
- IntrinsicLowering &IL;
+ DefaultIntrinsicLowering IL;
Mangler *Mang;
LoopInfo *LI;
const Module *TheModule;
std::map<const ConstantFP *, unsigned> FPConstantMap;
public:
- CWriter(std::ostream &o, IntrinsicLowering &il) : Out(o), IL(il) {}
+ CWriter(std::ostream &o) : Out(o) {}
virtual const char *getPassName() const { return "C backend"; }
const std::string &VariableName = "",
bool IgnoreName = false);
+ void printStructReturnPointerFunctionType(std::ostream &Out,
+ const PointerType *Ty);
+
void writeOperand(Value *Operand);
void writeOperandInternal(Value *Operand);
private :
void lowerIntrinsics(Function &F);
- bool nameAllUsedStructureTypes(Module &M);
void printModule(Module *M);
void printModuleTypes(const SymbolTable &ST);
void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
void printConstant(Constant *CPV);
void printConstantArray(ConstantArray *CPA);
+ void printConstantPacked(ConstantPacked *CP);
// isInlinableInst - Attempt to inline instructions into their uses to build
// trees as much as possible. To do this, we have to consistently decide
/// the program, and removes names from structure types that are not used by the
/// program.
///
-bool CBackendNameAllUsedStructs::runOnModule(Module &M) {
+bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
// Get a set of types that are used by the program...
std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
++RenameCounter;
Changed = true;
}
+
+
+ // Loop over all external functions and globals. If we have two with
+ // identical names, merge them.
+ // FIXME: This code should disappear when we don't allow values with the same
+ // names when they have different types!
+ std::map<std::string, GlobalValue*> ExtSymbols;
+ for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
+ Function *GV = I++;
+ if (GV->isExternal() && GV->hasName()) {
+ std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
+ = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
+ if (!X.second) {
+ // Found a conflict, replace this global with the previous one.
+ GlobalValue *OldGV = X.first->second;
+ GV->replaceAllUsesWith(ConstantExpr::getCast(OldGV, GV->getType()));
+ GV->eraseFromParent();
+ Changed = true;
+ }
+ }
+ }
+ // Do the same for globals.
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E;) {
+ GlobalVariable *GV = I++;
+ if (GV->isExternal() && GV->hasName()) {
+ std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
+ = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
+ if (!X.second) {
+ // Found a conflict, replace this global with the previous one.
+ GlobalValue *OldGV = X.first->second;
+ GV->replaceAllUsesWith(ConstantExpr::getCast(OldGV, GV->getType()));
+ GV->eraseFromParent();
+ Changed = true;
+ }
+ }
+ }
+
return Changed;
}
+/// 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(std::ostream &Out,
+ const PointerType *TheTy) {
+ const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
+ std::stringstream FunctionInnards;
+ FunctionInnards << " (*) (";
+ bool PrintedType = false;
+
+ FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
+ const Type *RetTy = cast<PointerType>(I->get())->getElementType();
+ for (++I; I != E; ++I) {
+ if (PrintedType)
+ FunctionInnards << ", ";
+ printType(FunctionInnards, *I, "");
+ PrintedType = true;
+ }
+ if (FTy->isVarArg()) {
+ if (PrintedType)
+ FunctionInnards << ", ...";
+ } else if (!PrintedType) {
+ FunctionInnards << "void";
+ }
+ FunctionInnards << ')';
+ std::string tstr = FunctionInnards.str();
+ printType(Out, RetTy, tstr);
+}
+
// Pass the Type* and the variable name and this prints out the variable
// declaration.
switch (Ty->getTypeID()) {
case Type::FunctionTyID: {
- const FunctionType *MTy = cast<FunctionType>(Ty);
+ const FunctionType *FTy = cast<FunctionType>(Ty);
std::stringstream FunctionInnards;
FunctionInnards << " (" << NameSoFar << ") (";
- for (FunctionType::param_iterator I = MTy->param_begin(),
- E = MTy->param_end(); I != E; ++I) {
- if (I != MTy->param_begin())
+ for (FunctionType::param_iterator I = FTy->param_begin(),
+ E = FTy->param_end(); I != E; ++I) {
+ if (I != FTy->param_begin())
FunctionInnards << ", ";
printType(FunctionInnards, *I, "");
}
- if (MTy->isVarArg()) {
- if (MTy->getNumParams())
+ if (FTy->isVarArg()) {
+ if (FTy->getNumParams())
FunctionInnards << ", ...";
- } else if (!MTy->getNumParams()) {
+ } else if (!FTy->getNumParams()) {
FunctionInnards << "void";
}
FunctionInnards << ')';
std::string tstr = FunctionInnards.str();
- printType(Out, MTy->getReturnType(), tstr);
+ printType(Out, FTy->getReturnType(), tstr);
return Out;
}
case Type::StructTyID: {
const PointerType *PTy = cast<PointerType>(Ty);
std::string ptrName = "*" + NameSoFar;
- if (isa<ArrayType>(PTy->getElementType()))
+ if (isa<ArrayType>(PTy->getElementType()) ||
+ isa<PackedType>(PTy->getElementType()))
ptrName = "(" + ptrName + ")";
return printType(Out, PTy->getElementType(), ptrName);
NameSoFar + "[" + utostr(NumElements) + "]");
}
+ case Type::PackedTyID: {
+ const PackedType *PTy = cast<PackedType>(Ty);
+ unsigned NumElements = PTy->getNumElements();
+ if (NumElements == 0) NumElements = 1;
+ return printType(Out, PTy->getElementType(),
+ NameSoFar + "[" + utostr(NumElements) + "]");
+ }
+
case Type::OpaqueTyID: {
static int Count = 0;
std::string TyName = "struct opaque_" + itostr(Count++);
}
}
+void CWriter::printConstantPacked(ConstantPacked *CP) {
+ Out << '{';
+ if (CP->getNumOperands()) {
+ Out << ' ';
+ printConstant(cast<Constant>(CP->getOperand(0)));
+ for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
+ Out << ", ";
+ printConstant(cast<Constant>(CP->getOperand(i)));
+ }
+ }
+ Out << " }";
+}
+
// isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
// textually as a double (rather than as a reference to a stack-allocated
// variable). We decide this by converting CFP to a string and back into a
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", (unsigned long long)DHex.ll);
+ uint64_t ll = DoubleToBits(FPC->getValue());
+ sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
std::string Num(&Buffer[0], &Buffer[6]);
unsigned long Val = strtoul(Num.c_str(), 0, 16);
}
break;
+ case Type::PackedTyID:
+ if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
+ const PackedType *AT = cast<PackedType>(CPV->getType());
+ Out << '{';
+ if (AT->getNumElements()) {
+ Out << ' ';
+ Constant *CZ = Constant::getNullValue(AT->getElementType());
+ printConstant(CZ);
+ for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
+ Out << ", ";
+ printConstant(CZ);
+ }
+ }
+ Out << " }";
+ } else {
+ printConstantPacked(cast<ConstantPacked>(CPV));
+ }
+ break;
+
case Type::StructTyID:
if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
const StructType *ST = cast<StructType>(CPV->getType());
// 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...
+ // Alloca is hard to get, and we don't want to include stdlib.h here.
Out << "/* get a declaration for alloca */\n"
- << "#if defined(__CYGWIN__)\n"
+ << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
<< "extern void *_alloca(unsigned long);\n"
<< "#define alloca(x) _alloca(x)\n"
<< "#elif defined(__APPLE__)\n"
<< "extern void *__builtin_alloca(unsigned int);\n"
<< "#endif\n"
<< "#define alloca(x) __builtin_alloca(x)\n"
- << "#elif defined(__FreeBSD__)\n"
+ << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
<< "#define alloca(x) __builtin_alloca(x)\n"
<< "#elif !defined(_MSC_VER)\n"
<< "#include <alloca.h>\n"
<< "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
<< "#define LLVM_INF __builtin_inf() /* Double */\n"
<< "#define LLVM_INFF __builtin_inff() /* Float */\n"
- << "#define LLVM_PREFETCH(addr,rw,locality) __builtin_prefetch(addr,rw,locality)\n"
+ << "#define LLVM_PREFETCH(addr,rw,locality) "
+ "__builtin_prefetch(addr,rw,locality)\n"
+ << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
+ << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
<< "#else\n"
<< "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
<< "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
<< "#define LLVM_INF ((double)0.0) /* Double */\n"
<< "#define LLVM_INFF 0.0F /* Float */\n"
<< "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
+ << "#define __ATTRIBUTE_CTOR__\n"
+ << "#define __ATTRIBUTE_DTOR__\n"
<< "#endif\n\n";
// Output target-specific code that should be inserted into main.
}
+/// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
+/// the StaticTors set.
+static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
+ ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
+ if (!InitList) return;
+
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
+ if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
+ if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
+
+ if (CS->getOperand(1)->isNullValue())
+ return; // Found a null terminator, exit printing.
+ Constant *FP = CS->getOperand(1);
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
+ if (CE->getOpcode() == Instruction::Cast)
+ FP = CE->getOperand(0);
+ if (Function *F = dyn_cast<Function>(FP))
+ StaticTors.insert(F);
+ }
+}
+
+enum SpecialGlobalClass {
+ NotSpecial = 0,
+ GlobalCtors, GlobalDtors,
+ NotPrinted
+};
+
+/// getGlobalVariableClass - If this is a global that is specially recognized
+/// by LLVM, return a code that indicates how we should handle it.
+static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
+ // If this is a global ctors/dtors list, handle it now.
+ if (GV->hasAppendingLinkage() && GV->use_empty()) {
+ if (GV->getName() == "llvm.global_ctors")
+ return GlobalCtors;
+ else if (GV->getName() == "llvm.global_dtors")
+ return GlobalDtors;
+ }
+
+ // Otherwise, it it is other metadata, don't print it. This catches things
+ // like debug information.
+ if (GV->getSection() == "llvm.metadata")
+ return NotPrinted;
+
+ return NotSpecial;
+}
+
+
bool CWriter::doInitialization(Module &M) {
// Initialize
TheModule = &M;
// Ensure that all structure types have names...
Mang = new Mangler(M);
-
+ Mang->markCharUnacceptable('.');
+
+ // Keep track of which functions are static ctors/dtors so they can have
+ // an attribute added to their prototypes.
+ std::set<Function*> StaticCtors, StaticDtors;
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ switch (getGlobalVariableClass(I)) {
+ default: break;
+ case GlobalCtors:
+ FindStaticTors(I, StaticCtors);
+ break;
+ case GlobalDtors:
+ FindStaticTors(I, StaticDtors);
+ break;
+ }
+ }
+
// get declaration for alloca
Out << "/* Provide Declarations */\n";
Out << "#include <stdarg.h>\n"; // Varargs support
// Global variable declarations...
if (!M.global_empty()) {
Out << "\n/* External Global Variable Declarations */\n";
- for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) {
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
if (I->hasExternalLinkage()) {
Out << "extern ";
printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
}
// Function declarations
- if (!M.empty()) {
- 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() &&
- I->getName() != "setjmp" && I->getName() != "longjmp") {
- printFunctionSignature(I, true);
- if (I->hasWeakLinkage()) Out << " __ATTRIBUTE_WEAK__";
- if (I->hasLinkOnceLinkage()) Out << " __ATTRIBUTE_WEAK__";
- Out << ";\n";
- }
+ Out << "\n/* Function Declarations */\n";
+ Out << "double fmod(double, double);\n"; // Support for FP rem
+ Out << "float fmodf(float, float);\n";
+
+ for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
+ // Don't print declarations for intrinsic functions.
+ if (!I->getIntrinsicID() &&
+ I->getName() != "setjmp" && I->getName() != "longjmp") {
+ printFunctionSignature(I, true);
+ if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
+ Out << " __ATTRIBUTE_WEAK__";
+ if (StaticCtors.count(I))
+ Out << " __ATTRIBUTE_CTOR__";
+ if (StaticDtors.count(I))
+ Out << " __ATTRIBUTE_DTOR__";
+ Out << ";\n";
}
}
// Output the global variable declarations
if (!M.global_empty()) {
Out << "\n\n/* Global Variable Declarations */\n";
- for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
if (!I->isExternal()) {
+ // Ignore special globals, such as debug info.
+ if (getGlobalVariableClass(I))
+ continue;
+
if (I->hasInternalLinkage())
Out << "static ";
else
// Output the global variable definitions and contents...
if (!M.global_empty()) {
Out << "\n\n/* Global Variable Definitions and Initialization */\n";
- for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
if (!I->isExternal()) {
+ // Ignore special globals, such as debug info.
+ if (getGlobalVariableClass(I))
+ continue;
+
if (I->hasInternalLinkage())
Out << "static ";
printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
// the compiler figure out the rest of the zeros.
Out << " = " ;
if (isa<StructType>(I->getInitializer()->getType()) ||
- isa<ArrayType>(I->getInitializer()->getType())) {
+ isa<ArrayType>(I->getInitializer()->getType()) ||
+ isa<PackedType>(I->getInitializer()->getType())) {
Out << "{ 0 }";
} else {
// Just print it out normally.
/// Output all floating point constants that cannot be printed accurately...
void CWriter::printFloatingPointConstants(Function &F) {
- union {
- double D;
- uint64_t U;
- } DBLUnion;
-
- union {
- float F;
- unsigned U;
- } FLTUnion;
-
// Scan the module for floating point constants. If any FP constant is used
// in the function, we want to redirect it here so that we do not depend on
// the precision of the printed form, unless the printed form preserves
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
+ << " = 0x" << std::hex << DoubleToBits(Val) << 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
+ << " = 0x" << std::hex << FloatToBits(Val) << std::dec
<< "U; /* " << Val << " */\n";
} else
assert(0 && "Unknown float type!");
/// printSymbolTable - Run through symbol table looking for type names. If a
-/// type name is found, emit it's declaration...
+/// type name is found, emit its declaration...
///
void CWriter::printModuleTypes(const SymbolTable &ST) {
// We are only interested in the type plane of the symbol table.
Out << "/* Structure forward decls */\n";
for (; I != End; ++I)
if (const Type *STy = dyn_cast<StructType>(I->second)) {
- std::string Name = "struct l_" + Mangler::makeNameProper(I->first);
+ std::string Name = "struct l_" + Mang->makeNameProper(I->first);
Out << Name << ";\n";
TypeNames.insert(std::make_pair(STy, Name));
}
Out << "/* Typedefs */\n";
for (I = ST.type_begin(); I != End; ++I) {
const Type *Ty = cast<Type>(I->second);
- std::string Name = "l_" + Mangler::makeNameProper(I->first);
+ std::string Name = "l_" + Mang->makeNameProper(I->first);
Out << "typedef ";
printType(Out, Ty, Name);
Out << ";\n";
// Push the struct onto the stack and recursively push all structs
// this one depends on.
+//
+// TODO: Make this work properly with packed types
+//
void CWriter::printContainedStructs(const Type *Ty,
std::set<const StructType*> &StructPrinted){
+ // Don't walk through pointers.
+ if (isa<PointerType>(Ty) || Ty->isPrimitiveType()) return;
+
+ // Print all contained types first.
+ for (Type::subtype_iterator I = Ty->subtype_begin(),
+ E = Ty->subtype_end(); I != E; ++I)
+ printContainedStructs(*I, StructPrinted);
+
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
- //Check to see if we have already printed this struct
- if (StructPrinted.count(STy) == 0) {
- // Print all contained types first...
- for (StructType::element_iterator I = STy->element_begin(),
- E = STy->element_end(); I != E; ++I) {
- const Type *Ty1 = I->get();
- if (isa<StructType>(Ty1) || isa<ArrayType>(Ty1))
- printContainedStructs(*I, StructPrinted);
- }
-
- //Print structure type out..
- StructPrinted.insert(STy);
+ // Check to see if we have already printed this struct.
+ if (StructPrinted.insert(STy).second) {
+ // Print structure type out.
std::string Name = TypeNames[STy];
printType(Out, STy, Name, true);
Out << ";\n\n";
}
-
- // If it is an array, check contained types and continue
- } else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)){
- const Type *Ty1 = ATy->getElementType();
- if (isa<StructType>(Ty1) || isa<ArrayType>(Ty1))
- printContainedStructs(Ty1, StructPrinted);
}
}
-
void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
+ /// isCStructReturn - Should this function actually return a struct by-value?
+ bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
+
if (F->hasInternalLinkage()) Out << "static ";
// Loop over the arguments, printing them...
// Print out the name...
FunctionInnards << Mang->getValueName(F) << '(';
+ bool PrintedArg = false;
if (!F->isExternal()) {
if (!F->arg_empty()) {
+ Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
+
+ // If this is a struct-return function, don't print the hidden
+ // struct-return argument.
+ if (isCStructReturn) {
+ assert(I != E && "Invalid struct return function!");
+ ++I;
+ }
+
std::string ArgName;
- if (F->arg_begin()->hasName() || !Prototype)
- ArgName = Mang->getValueName(F->arg_begin());
- printType(FunctionInnards, F->arg_begin()->getType(), ArgName);
- for (Function::const_arg_iterator I = ++F->arg_begin(), E = F->arg_end();
- I != E; ++I) {
- FunctionInnards << ", ";
+ for (; I != E; ++I) {
+ if (PrintedArg) FunctionInnards << ", ";
if (I->hasName() || !Prototype)
ArgName = Mang->getValueName(I);
else
ArgName = "";
printType(FunctionInnards, I->getType(), ArgName);
+ PrintedArg = true;
}
}
} else {
- // Loop over the arguments, printing them...
- for (FunctionType::param_iterator I = FT->param_begin(),
- E = FT->param_end(); I != E; ++I) {
- if (I != FT->param_begin()) FunctionInnards << ", ";
+ // Loop over the arguments, printing them.
+ FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
+
+ // If this is a struct-return function, don't print the hidden
+ // struct-return argument.
+ if (isCStructReturn) {
+ assert(I != E && "Invalid struct return function!");
+ ++I;
+ }
+
+ for (; I != E; ++I) {
+ if (PrintedArg) FunctionInnards << ", ";
printType(FunctionInnards, *I);
+ PrintedArg = true;
}
}
// Finish printing arguments... if this is a vararg function, print the ...,
// unless there are no known types, in which case, we just emit ().
//
- if (FT->isVarArg() && FT->getNumParams()) {
- if (FT->getNumParams()) FunctionInnards << ", ";
+ if (FT->isVarArg() && PrintedArg) {
+ if (PrintedArg) FunctionInnards << ", ";
FunctionInnards << "..."; // Output varargs portion of signature!
- } else if (!FT->isVarArg() && FT->getNumParams() == 0) {
+ } else if (!FT->isVarArg() && !PrintedArg) {
FunctionInnards << "void"; // ret() -> ret(void) in C.
}
FunctionInnards << ')';
- // Print out the return type and the entire signature for that matter
- printType(Out, F->getReturnType(), FunctionInnards.str());
+
+ // Get the return tpe for the function.
+ const Type *RetTy;
+ if (!isCStructReturn)
+ RetTy = F->getReturnType();
+ else {
+ // If this is a struct-return function, print the struct-return type.
+ RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
+ }
+
+ // Print out the return type and the signature built above.
+ printType(Out, RetTy, FunctionInnards.str());
}
void CWriter::printFunction(Function &F) {
printFunctionSignature(&F, false);
Out << " {\n";
+
+ // If this is a struct return function, handle the result with magic.
+ if (F.getCallingConv() == CallingConv::CSRet) {
+ const Type *StructTy =
+ cast<PointerType>(F.arg_begin()->getType())->getElementType();
+ Out << " ";
+ printType(Out, StructTy, "StructReturn");
+ Out << "; /* Struct return temporary */\n";
+
+ Out << " ";
+ printType(Out, F.arg_begin()->getType(), Mang->getValueName(F.arg_begin()));
+ Out << " = &StructReturn;\n";
+ }
+ bool PrintedVar = false;
+
// print local variable information for the function
for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I)
if (const AllocaInst *AI = isDirectAlloca(&*I)) {
Out << " ";
printType(Out, AI->getAllocatedType(), Mang->getValueName(AI));
Out << "; /* Address-exposed local */\n";
+ PrintedVar = true;
} else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
Out << " ";
printType(Out, I->getType(), Mang->getValueName(&*I));
Mang->getValueName(&*I)+"__PHI_TEMPORARY");
Out << ";\n";
}
+ PrintedVar = true;
}
- Out << '\n';
+ if (PrintedVar)
+ Out << '\n';
if (F.hasExternalLinkage() && F.getName() == "main")
Out << " CODE_FOR_MAIN();\n";
// necessary because we use the instruction classes as opaque types...
//
void CWriter::visitReturnInst(ReturnInst &I) {
+ // If this is a struct return function, return the temporary struct.
+ if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
+ Out << " return StructReturn;\n";
+ return;
+ }
+
// Don't output a void return if this is the last basic block in the function
if (I.getNumOperands() == 0 &&
&*--I.getParent()->getParent()->end() == I.getParent() &&
Out << "-(";
writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
Out << ")";
+ } else if (I.getOpcode() == Instruction::Rem &&
+ I.getType()->isFloatingPoint()) {
+ // Output a call to fmod/fmodf instead of emitting a%b
+ if (I.getType() == Type::FloatTy)
+ Out << "fmodf(";
+ else
+ Out << "fmod(";
+ writeOperand(I.getOperand(0));
+ Out << ", ";
+ writeOperand(I.getOperand(1));
+ Out << ")";
} else {
writeOperand(I.getOperand(0));
case Intrinsic::setjmp:
case Intrinsic::longjmp:
case Intrinsic::prefetch:
+ case Intrinsic::dbg_stoppoint:
// We directly implement these intrinsics
break;
default:
+ // If this is an intrinsic that directly corresponds to a GCC
+ // builtin, we handle it.
+ const char *BuiltinName = "";
+#define GET_GCC_BUILTIN_NAME
+#include "llvm/Intrinsics.gen"
+#undef GET_GCC_BUILTIN_NAME
+ // If we handle it, don't lower it.
+ if (BuiltinName[0]) break;
+
// All other intrinsic calls we must lower.
Instruction *Before = 0;
if (CI != &BB->front())
} else {
I = BB->begin();
}
+ break;
}
}
void CWriter::visitCallInst(CallInst &I) {
+ bool WroteCallee = false;
+
// Handle intrinsic function calls first...
if (Function *F = I.getCalledFunction())
if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
switch (ID) {
- default: assert(0 && "Unknown LLVM intrinsic!");
+ default: {
+ // If this is an intrinsic that directly corresponds to a GCC
+ // builtin, we emit it here.
+ const char *BuiltinName = "";
+#define GET_GCC_BUILTIN_NAME
+#include "llvm/Intrinsics.gen"
+#undef GET_GCC_BUILTIN_NAME
+ assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
+
+ Out << BuiltinName;
+ WroteCallee = true;
+ break;
+ }
case Intrinsic::vastart:
Out << "0; ";
- // Out << "va_start(*(va_list*)&" << Mang->getValueName(&I) << ", ";
Out << "va_start(*(va_list*)";
writeOperand(I.getOperand(1));
Out << ", ";
Out << ')';
return;
case Intrinsic::setjmp:
+#if defined(HAVE__SETJMP) && defined(HAVE__LONGJMP)
+ Out << "_"; // Use _setjmp on systems that support it!
+#endif
Out << "setjmp(*(jmp_buf*)";
writeOperand(I.getOperand(1));
Out << ')';
return;
case Intrinsic::longjmp:
+#if defined(HAVE__SETJMP) && defined(HAVE__LONGJMP)
+ Out << "_"; // Use _longjmp on systems that support it!
+#endif
Out << "longjmp(*(jmp_buf*)";
writeOperand(I.getOperand(1));
Out << ", ";
writeOperand(I.getOperand(3));
Out << ")";
return;
+ case Intrinsic::dbg_stoppoint: {
+ // If we use writeOperand directly we get a "u" suffix which is rejected
+ // by gcc.
+ DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
+
+ Out << "\n#line "
+ << SPI.getLine()
+ << " \"" << SPI.getDirectory()
+ << SPI.getFileName() << "\"\n";
+ return;
+ }
}
}
Value *Callee = I.getCalledValue();
- // GCC is really a PITA. It does not permit codegening casts of functions to
- // function pointers if they are in a call (it generates a trap instruction
- // instead!). We work around this by inserting a cast to void* in between the
- // function and the function pointer cast. Unfortunately, we can't just form
- // the constant expression here, because the folder will immediately nuke it.
- //
- // Note finally, that this is completely unsafe. ANSI C does not guarantee
- // that void* and function pointers have the same size. :( To deal with this
- // in the common case, we handle casts where the number of arguments passed
- // match exactly.
- //
- bool WroteCallee = false;
+ // If this is a call to a struct-return function, assign to the first
+ // parameter instead of passing it to the call.
+ bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
+ if (isStructRet) {
+ Out << "*(";
+ writeOperand(I.getOperand(1));
+ Out << ") = ";
+ }
+
if (I.isTailCall()) Out << " /*tail*/ ";
- if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
- if (CE->getOpcode() == Instruction::Cast)
- if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
- const FunctionType *RFTy = RF->getFunctionType();
- if (RFTy->getNumParams() == I.getNumOperands()-1) {
- // If the call site expects a value, and the actual callee doesn't
- // provide one, return 0.
- if (I.getType() != Type::VoidTy &&
- RFTy->getReturnType() == Type::VoidTy)
- Out << "0 /*actual callee doesn't return value*/; ";
- Callee = RF;
- } else {
- // Ok, just cast the pointer type.
- Out << "((";
- printType(Out, CE->getType());
- Out << ")(void*)";
- printConstant(RF);
- Out << ')';
- WroteCallee = true;
- }
- }
const PointerType *PTy = cast<PointerType>(Callee->getType());
const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
- const Type *RetTy = FTy->getReturnType();
+
+ if (!WroteCallee) {
+ // If this is an indirect call to a struct return function, we need to cast
+ // the pointer.
+ bool NeedsCast = isStructRet && !isa<Function>(Callee);
+
+ // GCC is a real PITA. It does not permit codegening casts of functions to
+ // function pointers if they are in a call (it generates a trap instruction
+ // instead!). We work around this by inserting a cast to void* in between
+ // the function and the function pointer cast. Unfortunately, we can't just
+ // form the constant expression here, because the folder will immediately
+ // nuke it.
+ //
+ // Note finally, that this is completely unsafe. ANSI C does not guarantee
+ // that void* and function pointers have the same size. :( To deal with this
+ // in the common case, we handle casts where the number of arguments passed
+ // match exactly.
+ //
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
+ if (CE->getOpcode() == Instruction::Cast)
+ if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
+ NeedsCast = true;
+ Callee = RF;
+ }
+
+ if (NeedsCast) {
+ // Ok, just cast the pointer type.
+ Out << "((";
+ if (!isStructRet)
+ printType(Out, I.getCalledValue()->getType());
+ else
+ printStructReturnPointerFunctionType(Out,
+ cast<PointerType>(I.getCalledValue()->getType()));
+ Out << ")(void*)";
+ }
+ writeOperand(Callee);
+ if (NeedsCast) Out << ')';
+ }
- if (!WroteCallee) writeOperand(Callee);
Out << '(';
unsigned NumDeclaredParams = FTy->getNumParams();
- if (I.getNumOperands() != 1) {
- CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
- if (NumDeclaredParams && (*AI)->getType() != FTy->getParamType(0)) {
+ CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
+ unsigned ArgNo = 0;
+ if (isStructRet) { // Skip struct return argument.
+ ++AI;
+ ++ArgNo;
+ }
+
+ bool PrintedArg = false;
+ for (; AI != AE; ++AI, ++ArgNo) {
+ if (PrintedArg) Out << ", ";
+ if (ArgNo < NumDeclaredParams &&
+ (*AI)->getType() != FTy->getParamType(ArgNo)) {
Out << '(';
- printType(Out, FTy->getParamType(0));
+ printType(Out, FTy->getParamType(ArgNo));
Out << ')';
}
-
writeOperand(*AI);
-
- unsigned ArgNo;
- for (ArgNo = 1, ++AI; AI != AE; ++AI, ++ArgNo) {
- Out << ", ";
- if (ArgNo < NumDeclaredParams &&
- (*AI)->getType() != FTy->getParamType(ArgNo)) {
- Out << '(';
- printType(Out, FTy->getParamType(ArgNo));
- Out << ')';
- }
- writeOperand(*AI);
- }
+ PrintedArg = true;
}
Out << ')';
}
Out << '*';
if (I.isVolatile()) {
Out << "((";
- printType(Out, I.getType());
- Out << " volatile*)";
+ printType(Out, I.getType(), "volatile*");
+ Out << ")";
}
writeOperand(I.getOperand(0));
Out << '*';
if (I.isVolatile()) {
Out << "((";
- printType(Out, I.getOperand(0)->getType());
- Out << " volatile*)";
+ printType(Out, I.getOperand(0)->getType(), " volatile*");
+ Out << ")";
}
writeOperand(I.getPointerOperand());
if (I.isVolatile()) Out << ')';
//===----------------------------------------------------------------------===//
bool CTargetMachine::addPassesToEmitFile(PassManager &PM, std::ostream &o,
- CodeGenFileType FileType) {
+ CodeGenFileType FileType, bool Fast) {
if (FileType != TargetMachine::AssemblyFile) return true;
PM.add(createLowerGCPass());
PM.add(createLowerAllocationsPass(true));
PM.add(createLowerInvokePass());
- PM.add(new CBackendNameAllUsedStructs());
- PM.add(new CWriter(o, getIntrinsicLowering()));
+ PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
+ PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
+ PM.add(new CWriter(o));
return false;
}
projects / oota-llvm.git / blobdiff