//===-- Writer.cpp - Library for converting LLVM code to C ----------------===//
//
-// This library implements the functionality defined in llvm/Assembly/CWriter.h
+// This library converts LLVM code to C code, compilable by GCC.
//
-// TODO : Recursive types.
-//
-//===-----------------------------------------------------------------------==//
+//===----------------------------------------------------------------------===//
#include "llvm/Assembly/CWriter.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
-#include "llvm/iMemory.h"
-#include "llvm/iTerminators.h"
-#include "llvm/iPHINode.h"
-#include "llvm/iOther.h"
-#include "llvm/iOperators.h"
+#include "llvm/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/SymbolTable.h"
-#include "llvm/SlotCalculator.h"
+#include "llvm/Intrinsics.h"
#include "llvm/Analysis/FindUsedTypes.h"
+#include "llvm/Analysis/ConstantsScanner.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/InstIterator.h"
+#include "llvm/Support/CallSite.h"
+#include "llvm/Support/Mangler.h"
#include "Support/StringExtras.h"
#include "Support/STLExtras.h"
#include <algorithm>
-#include <set>
-using std::string;
-using std::map;
-using std::ostream;
+#include <sstream>
namespace {
class CWriter : public Pass, public InstVisitor<CWriter> {
- ostream &Out;
- SlotCalculator *Table;
+ std::ostream &Out;
+ Mangler *Mang;
const Module *TheModule;
- map<const Type *, string> TypeNames;
+ std::map<const Type *, std::string> TypeNames;
std::set<const Value*> MangledGlobals;
+ bool needsMalloc, emittedInvoke;
+ std::map<const ConstantFP *, unsigned> FPConstantMap;
public:
- CWriter(ostream &o) : Out(o) {}
+ CWriter(std::ostream &o) : Out(o) {}
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
virtual bool run(Module &M) {
// Initialize
- Table = new SlotCalculator(&M, false);
TheModule = &M;
// Ensure that all structure types have names...
bool Changed = nameAllUsedStructureTypes(M);
+ Mang = new Mangler(M);
// Run...
printModule(&M);
// Free memory...
- delete Table;
+ delete Mang;
TypeNames.clear();
MangledGlobals.clear();
return false;
}
- ostream &printType(const Type *Ty, const string &VariableName = "",
- bool IgnoreName = false, bool namedContext = true);
+ std::ostream &printType(std::ostream &Out, const Type *Ty,
+ const std::string &VariableName = "",
+ bool IgnoreName = false, bool namedContext = true);
void writeOperand(Value *Operand);
void writeOperandInternal(Value *Operand);
- string getValueName(const Value *V);
-
private :
bool nameAllUsedStructureTypes(Module &M);
void printModule(Module *M);
void printSymbolTable(const SymbolTable &ST);
void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
- void printGlobal(const GlobalVariable *GV);
void printFunctionSignature(const Function *F, bool Prototype);
void printFunction(Function *);
// 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.use_size() != 1 ||
- isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I))
+ isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
+ isa<LoadInst>(I) || isa<VarArgInst>(I))
+ // Don't inline a load across a store or other bad things!
return false;
// Only inline instruction it it's use is in the same BB as the inst.
return I.getParent() == cast<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 AllocaInst *isDirectAlloca(const Value *V) {
+ const AllocaInst *AI = dyn_cast<AllocaInst>(V);
+ if (!AI) return false;
+ if (AI->isArrayAllocation())
+ return 0; // FIXME: we can also inline fixed size array allocas!
+ if (AI->getParent() != &AI->getParent()->getParent()->getEntryNode())
+ return 0;
+ return AI;
+ }
+
// Instruction visitation functions
friend class InstVisitor<CWriter>;
void visitReturnInst(ReturnInst &I);
void visitBranchInst(BranchInst &I);
+ void visitSwitchInst(SwitchInst &I);
+ void visitInvokeInst(InvokeInst &I);
+ void visitUnwindInst(UnwindInst &I);
- void visitPHINode(PHINode &I) {}
+ void visitPHINode(PHINode &I);
void visitBinaryOperator(Instruction &I);
void visitCastInst (CastInst &I);
void visitCallInst (CallInst &I);
+ void visitCallSite (CallSite CS);
void visitShiftInst(ShiftInst &I) { visitBinaryOperator(I); }
void visitMallocInst(MallocInst &I);
void visitLoadInst (LoadInst &I);
void visitStoreInst (StoreInst &I);
void visitGetElementPtrInst(GetElementPtrInst &I);
+ void visitVarArgInst(VarArgInst &I);
void visitInstruction(Instruction &I) {
std::cerr << "C Writer does not know about " << I;
}
void outputLValue(Instruction *I) {
- Out << " " << getValueName(I) << " = ";
+ Out << " " << Mang->getValueName(I) << " = ";
}
void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
unsigned Indent);
};
}
-// We dont want identifier names with ., space, - in them.
-// So we replace them with _
-static string makeNameProper(string x) {
- string tmp;
- for (string::iterator sI = x.begin(), sEnd = x.end(); sI != sEnd; sI++)
- switch (*sI) {
- case '.': tmp += "d_"; break;
- case ' ': tmp += "s_"; break;
- case '-': tmp += "D_"; break;
- default: tmp += *sI;
- }
-
- return tmp;
-}
-
-string CWriter::getValueName(const Value *V) {
- if (V->hasName()) { // Print out the label if it exists...
- if (isa<GlobalValue>(V) && // Do not mangle globals...
- cast<GlobalValue>(V)->hasExternalLinkage() && // Unless it's internal or
- !MangledGlobals.count(V)) // Unless the name would collide if we don't
- return makeNameProper(V->getName());
-
- return "l" + utostr(V->getType()->getUniqueID()) + "_" +
- makeNameProper(V->getName());
- }
-
- int Slot = Table->getValSlot(V);
- assert(Slot >= 0 && "Invalid value!");
- return "ltmp_" + itostr(Slot) + "_" + utostr(V->getType()->getUniqueID());
-}
-
// A pointer type should not use parens around *'s alone, e.g., (**)
-inline bool ptrTypeNameNeedsParens(const string &NameSoFar) {
+inline bool ptrTypeNameNeedsParens(const std::string &NameSoFar) {
return (NameSoFar.find_last_not_of('*') != std::string::npos);
}
// Pass the Type* and the variable name and this prints out the variable
// declaration.
//
-ostream &CWriter::printType(const Type *Ty, const string &NameSoFar,
- bool IgnoreName, bool namedContext) {
+std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
+ const std::string &NameSoFar,
+ bool IgnoreName, bool namedContext) {
if (Ty->isPrimitiveType())
switch (Ty->getPrimitiveID()) {
case Type::VoidTyID: return Out << "void " << NameSoFar;
}
// Check to see if the type is named.
- if (!IgnoreName) {
- map<const Type *, string>::iterator I = TypeNames.find(Ty);
- if (I != TypeNames.end()) {
- return Out << I->second << " " << NameSoFar;
- }
- }
+ if (!IgnoreName || isa<OpaqueType>(Ty)) {
+ std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
+ if (I != TypeNames.end()) return Out << I->second << " " << NameSoFar;
+ }
switch (Ty->getPrimitiveID()) {
case Type::FunctionTyID: {
const FunctionType *MTy = cast<FunctionType>(Ty);
- printType(MTy->getReturnType(), "");
- Out << " " << NameSoFar << " (";
-
+ std::stringstream FunctionInnards;
+ FunctionInnards << " (" << NameSoFar << ") (";
for (FunctionType::ParamTypes::const_iterator
I = MTy->getParamTypes().begin(),
E = MTy->getParamTypes().end(); I != E; ++I) {
if (I != MTy->getParamTypes().begin())
- Out << ", ";
- printType(*I, "");
+ FunctionInnards << ", ";
+ printType(FunctionInnards, *I, "");
}
if (MTy->isVarArg()) {
if (!MTy->getParamTypes().empty())
- Out << ", ";
- Out << "...";
+ FunctionInnards << ", ...";
+ } else if (MTy->getParamTypes().empty()) {
+ FunctionInnards << "void";
}
- return Out << ")";
+ FunctionInnards << ")";
+ std::string tstr = FunctionInnards.str();
+ printType(Out, MTy->getReturnType(), tstr);
+ return Out;
}
case Type::StructTyID: {
const StructType *STy = cast<StructType>(Ty);
I = STy->getElementTypes().begin(),
E = STy->getElementTypes().end(); I != E; ++I) {
Out << " ";
- printType(*I, "field" + utostr(Idx++));
+ printType(Out, *I, "field" + utostr(Idx++));
Out << ";\n";
}
return Out << "}";
// Do not need parens around "* NameSoFar" if NameSoFar consists only
// of zero or more '*' chars *and* this is not an unnamed pointer type
// such as the result type in a cast statement. Otherwise, enclose in ( ).
- if (ptrTypeNameNeedsParens(NameSoFar) || !namedContext)
+ if (ptrTypeNameNeedsParens(NameSoFar) || !namedContext ||
+ PTy->getElementType()->getPrimitiveID() == Type::ArrayTyID)
ptrName = "(" + ptrName + ")"; //
- return printType(PTy->getElementType(), ptrName);
+ return printType(Out, PTy->getElementType(), ptrName);
}
case Type::ArrayTyID: {
const ArrayType *ATy = cast<ArrayType>(Ty);
unsigned NumElements = ATy->getNumElements();
- return printType(ATy->getElementType(),
+ return printType(Out, ATy->getElementType(),
NameSoFar + "[" + utostr(NumElements) + "]");
}
+
+ case Type::OpaqueTyID: {
+ static int Count = 0;
+ std::string TyName = "struct opaque_" + itostr(Count++);
+ assert(TypeNames.find(Ty) == TypeNames.end());
+ TypeNames[Ty] = TyName;
+ return Out << TyName << " " << NameSoFar;
+ }
default:
assert(0 && "Unhandled case in getTypeProps!");
abort();
bool isString = (ETy == Type::SByteTy || ETy == Type::UByteTy);
// Make sure the last character is a null char, as automatically added by C
- if (CPA->getNumOperands() == 0 ||
- !cast<Constant>(*(CPA->op_end()-1))->isNullValue())
+ if (isString && (CPA->getNumOperands() == 0 ||
+ !cast<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 = (ETy == Type::SByteTy) ?
- (unsigned char)cast<ConstantSInt>(CPA->getOperand(i))->getValue() :
- (unsigned char)cast<ConstantUInt>(CPA->getOperand(i))->getValue();
+ unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getRawValue();
- if (isprint(C)) {
- Out << C;
+ // 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 << "\\" << C;
+ else
+ Out << 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 << ( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A');
- Out << ((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A');
+ 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;
}
}
}
}
+/// FPCSafeToPrint - 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 double, and then checking whether the
+/// conversion results in a bit-equal double to the original value of
+/// CFP. This depends on us and the target C compiler agreeing on the
+/// conversion process (which is pretty likely since we only deal in
+/// IEEE FP.) This is adapted from similar code in
+/// lib/VMCore/AsmWriter.cpp:WriteConstantInt().
+static bool FPCSafeToPrint (const ConstantFP *CFP) {
+ std::string StrVal = ftostr(CFP->getValue());
+ // Check to make sure that the stringized number is not some string like
+ // "Inf" or NaN, that atof will accept, but the lexer will not. Check that
+ // the string matches the "[-+]?[0-9]" regex.
+ if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
+ ((StrVal[0] == '-' || StrVal[0] == '+') &&
+ (StrVal[1] >= '0' && StrVal[1] <= '9')))
+ // Reparse stringized version!
+ return (atof(StrVal.c_str()) == CFP->getValue());
+ return false;
+}
// printConstant - The LLVM Constant to C Constant converter.
void CWriter::printConstant(Constant *CPV) {
switch (CE->getOpcode()) {
case Instruction::Cast:
Out << "((";
- printType(CPV->getType());
+ printType(Out, CPV->getType());
Out << ")";
- printConstant(cast<Constant>(CPV->getOperand(0)));
+ printConstant(CE->getOperand(0));
Out << ")";
return;
case Instruction::GetElementPtr:
- Out << "&(";
- printIndexingExpression(CPV->getOperand(0),
+ Out << "(&(";
+ printIndexingExpression(CE->getOperand(0),
CPV->op_begin()+1, CPV->op_end());
- Out << ")";
+ Out << "))";
return;
case Instruction::Add:
- Out << "(";
- printConstant(cast<Constant>(CPV->getOperand(0)));
- Out << " + ";
- printConstant(cast<Constant>(CPV->getOperand(1)));
- Out << ")";
- return;
case Instruction::Sub:
+ case Instruction::Mul:
+ case Instruction::Div:
+ case Instruction::Rem:
+ case Instruction::SetEQ:
+ case Instruction::SetNE:
+ case Instruction::SetLT:
+ case Instruction::SetLE:
+ case Instruction::SetGT:
+ case Instruction::SetGE:
Out << "(";
- printConstant(cast<Constant>(CPV->getOperand(0)));
- Out << " - ";
- printConstant(cast<Constant>(CPV->getOperand(1)));
+ printConstant(CE->getOperand(0));
+ switch (CE->getOpcode()) {
+ case Instruction::Add: Out << " + "; break;
+ case Instruction::Sub: Out << " - "; break;
+ case Instruction::Mul: Out << " * "; break;
+ case Instruction::Div: Out << " / "; break;
+ case Instruction::Rem: Out << " % "; break;
+ case Instruction::SetEQ: Out << " == "; break;
+ case Instruction::SetNE: Out << " != "; break;
+ case Instruction::SetLT: Out << " < "; break;
+ case Instruction::SetLE: Out << " <= "; break;
+ case Instruction::SetGT: Out << " > "; break;
+ case Instruction::SetGE: Out << " >= "; break;
+ default: assert(0 && "Illegal opcode here!");
+ }
+ printConstant(CE->getOperand(1));
Out << ")";
return;
Out << (CPV == ConstantBool::False ? "0" : "1"); break;
case Type::SByteTyID:
case Type::ShortTyID:
- case Type::IntTyID:
Out << cast<ConstantSInt>(CPV)->getValue(); break;
+ case Type::IntTyID:
+ if ((int)cast<ConstantSInt>(CPV)->getValue() == (int)0x80000000)
+ Out << "((int)0x80000000)"; // Handle MININT specially to avoid warning
+ else
+ Out << cast<ConstantSInt>(CPV)->getValue();
+ break;
+
case Type::LongTyID:
Out << cast<ConstantSInt>(CPV)->getValue() << "ll"; break;
Out << cast<ConstantUInt>(CPV)->getValue() << "ull"; break;
case Type::FloatTyID:
- case Type::DoubleTyID:
- Out << cast<ConstantFP>(CPV)->getValue(); break;
+ case Type::DoubleTyID: {
+ ConstantFP *FPC = cast<ConstantFP>(CPV);
+ std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
+ if (I != FPConstantMap.end()) {
+ // Because of FP precision problems we must load from a stack allocated
+ // value that holds the value in hex.
+ Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
+ << "*)&FloatConstant" << I->second << ")";
+ } else {
+ if (FPCSafeToPrint (FPC)) {
+ Out << ftostr (FPC->getValue ());
+ } else {
+ Out << FPC->getValue(); // Who knows? Give it our best shot...
+ }
+ }
+ break;
+ }
case Type::ArrayTyID:
printConstantArray(cast<ConstantArray>(CPV));
case Type::PointerTyID:
if (isa<ConstantPointerNull>(CPV)) {
Out << "((";
- printType(CPV->getType(), "");
- Out << ")NULL)";
+ printType(Out, CPV->getType());
+ Out << ")/*NULL*/0)";
break;
} else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CPV)) {
writeOperand(CPR->getValue());
void CWriter::writeOperandInternal(Value *Operand) {
if (Instruction *I = dyn_cast<Instruction>(Operand))
- if (isInlinableInst(*I)) {
+ if (isInlinableInst(*I) && !isDirectAlloca(I)) {
// Should we inline this instruction to build a tree?
Out << "(";
visit(*I);
return;
}
- if (Operand->hasName()) {
- Out << getValueName(Operand);
- } else if (Constant *CPV = dyn_cast<Constant>(Operand)) {
+ if (Constant *CPV = dyn_cast<Constant>(Operand)) {
printConstant(CPV);
} else {
- int Slot = Table->getValSlot(Operand);
- assert(Slot >= 0 && "Malformed LLVM!");
- Out << "ltmp_" << Slot << "_" << Operand->getType()->getUniqueID();
+ Out << Mang->getValueName(Operand);
}
}
void CWriter::writeOperand(Value *Operand) {
- if (isa<GlobalVariable>(Operand))
+ if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
Out << "(&"; // Global variables are references as their addresses by llvm
writeOperandInternal(Operand);
- if (isa<GlobalVariable>(Operand))
+ if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
Out << ")";
}
// Loop over the module symbol table, removing types from UT that are already
// named.
//
- SymbolTable *MST = M.getSymbolTableSure();
- 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)
+ 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
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);
+ ((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"
+ << "extern void *__builtin_alloca(unsigned long);\n"
+ << "#define alloca(x) __builtin_alloca(x)\n"
+ << "#else\n"
+ << "#ifndef __FreeBSD__\n"
+ << "#include <alloca.h>\n"
+ << "#endif\n"
+ << "#endif\n\n";
+
+ // We output GCC specific attributes to preserve 'linkonce'ness on globals.
+ // If we aren't being compiled with GCC, just drop these attributes.
+ Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
+ << "#define __attribute__(X)\n"
+ << "#endif\n";
+}
+
void CWriter::printModule(Module *M) {
// Calculate which global values have names that will collide when we throw
// away type information.
{ // Scope to delete the FoundNames set when we are done with it...
- std::set<string> FoundNames;
+ std::set<std::string> FoundNames;
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
if (I->hasName()) // If the global has a name...
if (FoundNames.count(I->getName())) // And the name is already used
FoundNames.insert(I->getName()); // Otherwise, keep track of name
}
- // printing stdlib inclusion
- // Out << "#include <stdlib.h>\n";
-
// get declaration for alloca
- Out << "/* Provide Declarations */\n"
- << "#include <malloc.h>\n"
- << "#include <alloca.h>\n\n"
-
- // Provide a definition for null if one does not already exist,
- // and for `bool' if not compiling with a C++ compiler.
- << "#ifndef NULL\n#define NULL 0\n#endif\n\n"
+ Out << "/* Provide Declarations */\n";
+ Out << "#include <stdarg.h>\n";
+ Out << "#include <setjmp.h>\n";
+ generateCompilerSpecificCode(Out);
+
+ // Provide a definition for `bool' if not compiling with a C++ compiler.
+ Out << "\n"
<< "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
+
+ << "\n\n/* Support for floating point constants */\n"
+ << "typedef unsigned long long ConstantDoubleTy;\n"
+ << "typedef unsigned int ConstantFloatTy;\n"
+
+ << "\n\n/* Support for the invoke instruction */\n"
+ << "extern struct __llvm_jmpbuf_list_t {\n"
+ << " jmp_buf buf; struct __llvm_jmpbuf_list_t *next;\n"
+ << "} *__llvm_jmpbuf_list;\n"
<< "\n\n/* Global Declarations */\n";
//
// Loop over the symbol table, emitting all named constants...
- if (M->hasSymbolTable())
- printSymbolTable(*M->getSymbolTable());
+ printSymbolTable(M->getSymbolTable());
// Global variable declarations...
if (!M->gempty()) {
for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I) {
if (I->hasExternalLinkage()) {
Out << "extern ";
- printType(I->getType()->getElementType(), getValueName(I));
+ printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
Out << ";\n";
}
}
// Function declarations
if (!M->empty()) {
Out << "\n/* Function Declarations */\n";
+ needsMalloc = true;
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I) {
- printFunctionSignature(I, true);
- Out << ";\n";
+ // If the function is external and the name collides don't print it.
+ // Sometimes the bytecode likes to have multiple "declarations" for
+ // external functions
+ if ((I->hasInternalLinkage() || !MangledGlobals.count(I)) &&
+ !I->getIntrinsicID()) {
+ printFunctionSignature(I, true);
+ Out << ";\n";
+ }
}
}
+ // Print Malloc prototype if needed
+ if (needsMalloc) {
+ Out << "\n/* Malloc to make sun happy */\n";
+ Out << "extern void * malloc();\n\n";
+ }
+
+ // Output the global variable declarations
+ if (!M->gempty()) {
+ Out << "\n\n/* Global Variable Declarations */\n";
+ for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
+ if (!I->isExternal()) {
+ Out << "extern ";
+ printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
+
+ Out << ";\n";
+ }
+ }
+
// Output the global variable definitions and contents...
if (!M->gempty()) {
Out << "\n\n/* Global Variable Definitions and Initialization */\n";
- for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I) {
- if (I->hasExternalLinkage())
- continue; // printed above!
- Out << "static ";
- printType(I->getType()->getElementType(), getValueName(I));
-
- if (I->hasInitializer()) {
- Out << " = " ;
- writeOperand(I->getInitializer());
+ for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
+ if (!I->isExternal()) {
+ if (I->hasInternalLinkage())
+ Out << "static ";
+ printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
+ if (I->hasLinkOnceLinkage())
+ Out << " __attribute__((common))";
+ if (!I->getInitializer()->isNullValue()) {
+ Out << " = " ;
+ writeOperand(I->getInitializer());
+ }
+ Out << ";\n";
}
- Out << ";\n";
- }
}
// Output all of the functions...
+ emittedInvoke = false;
if (!M->empty()) {
Out << "\n\n/* Function Bodies */\n";
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
printFunction(I);
}
+
+ // If the program included an invoke instruction, we need to output the
+ // support code for it here!
+ if (emittedInvoke) {
+ Out << "\n/* More support for the invoke instruction */\n"
+ << "struct __llvm_jmpbuf_list_t *__llvm_jmpbuf_list "
+ << "__attribute__((common)) = 0;\n";
+ }
}
SymbolTable::type_const_iterator I = ST.type_begin(Type::TypeTy);
SymbolTable::type_const_iterator End = ST.type_end(Type::TypeTy);
- for (; I != End; ++I) {
- const Value *V = I->second;
- if (const Type *Ty = dyn_cast<Type>(V))
- if (const Type *STy = dyn_cast<StructType>(Ty)) {
- string Name = "struct l_" + makeNameProper(I->first);
- Out << Name << ";\n";
- TypeNames.insert(std::make_pair(STy, Name));
- } else {
- string Name = "l_" + makeNameProper(I->first);
- Out << "typedef ";
- printType(Ty, Name, true);
- Out << ";\n";
- }
+ // 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)) {
+ 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) {
+ 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";
// Loop over all structures then push them into the stack so they are
// printed in the correct order.
//
+ Out << "/* Structure contents */\n";
for (I = ST.type_begin(Type::TypeTy); I != End; ++I)
if (const StructType *STy = dyn_cast<StructType>(I->second))
printContainedStructs(STy, StructPrinted);
// this one depends on.
void CWriter::printContainedStructs(const Type *Ty,
std::set<const StructType*> &StructPrinted){
- if (const StructType *STy = dyn_cast<StructType>(Ty)){
+ 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...
E = STy->getElementTypes().end(); I != E; ++I) {
const Type *Ty1 = I->get();
if (isa<StructType>(Ty1) || isa<ArrayType>(Ty1))
- printContainedStructs(Ty1, StructPrinted);
+ printContainedStructs(*I, StructPrinted);
}
//Print structure type out..
StructPrinted.insert(STy);
- string Name = TypeNames[STy];
- printType(STy, Name, true);
- Out << ";\n";
+ std::string Name = TypeNames[STy];
+ printType(Out, STy, Name, true);
+ Out << ";\n\n";
}
// If it is an array, check contained types and continue
void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
+ // If the program provides its own malloc prototype we don't need
+ // to include the general one.
+ if (Mang->getValueName(F) == "malloc")
+ needsMalloc = false;
+
if (F->hasInternalLinkage()) Out << "static ";
+ if (F->hasLinkOnceLinkage()) Out << "inline ";
// Loop over the arguments, printing them...
const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
- // Print out the return type and name...
- printType(F->getReturnType());
- Out << getValueName(F) << "(";
+ std::stringstream FunctionInnards;
+
+ // Print out the name...
+ FunctionInnards << Mang->getValueName(F) << "(";
if (!F->isExternal()) {
if (!F->aempty()) {
- string ArgName;
+ std::string ArgName;
if (F->abegin()->hasName() || !Prototype)
- ArgName = getValueName(F->abegin());
-
- printType(F->afront().getType(), ArgName);
-
+ ArgName = Mang->getValueName(F->abegin());
+ printType(FunctionInnards, F->afront().getType(), ArgName);
for (Function::const_aiterator I = ++F->abegin(), E = F->aend();
I != E; ++I) {
- Out << ", ";
+ FunctionInnards << ", ";
if (I->hasName() || !Prototype)
- ArgName = getValueName(I);
+ ArgName = Mang->getValueName(I);
else
ArgName = "";
- printType(I->getType(), ArgName);
+ printType(FunctionInnards, I->getType(), ArgName);
}
}
} else {
for (FunctionType::ParamTypes::const_iterator I =
FT->getParamTypes().begin(),
E = FT->getParamTypes().end(); I != E; ++I) {
- if (I != FT->getParamTypes().begin()) Out << ", ";
- printType(*I);
+ if (I != FT->getParamTypes().begin()) FunctionInnards << ", ";
+ printType(FunctionInnards, *I);
}
}
- // Finish printing arguments...
- if (FT->isVarArg()) {
- if (FT->getParamTypes().size()) Out << ", ";
- Out << "..."; // Output varargs portion of signature!
+ // 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->getParamTypes().empty()) {
+ if (FT->getParamTypes().size()) FunctionInnards << ", ";
+ FunctionInnards << "..."; // Output varargs portion of signature!
}
- Out << ")";
+ FunctionInnards << ")";
+ // Print out the return type and the entire signature for that matter
+ printType(Out, F->getReturnType(), FunctionInnards.str());
}
-
void CWriter::printFunction(Function *F) {
if (F->isExternal()) return;
- Table->incorporateFunction(F);
-
printFunctionSignature(F, false);
Out << " {\n";
// print local variable information for the function
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
- if ((*I)->getType() != Type::VoidTy && !isInlinableInst(**I)) {
+ if (const AllocaInst *AI = isDirectAlloca(*I)) {
+ Out << " ";
+ printType(Out, AI->getAllocatedType(), Mang->getValueName(AI));
+ Out << "; /* Address exposed local */\n";
+ } else if ((*I)->getType() != Type::VoidTy && !isInlinableInst(**I)) {
Out << " ";
- printType((*I)->getType(), getValueName(*I));
+ printType(Out, (*I)->getType(), Mang->getValueName(*I));
Out << ";\n";
+
+ if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
+ Out << " ";
+ printType(Out, (*I)->getType(), Mang->getValueName(*I)+"__PHI_TEMPORARY");
+ Out << ";\n";
+ }
}
+
+ Out << "\n";
+
+ // Scan the function 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
+ // precision.
+ //
+ 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 ((!FPCSafeToPrint(FPC)) // Do not put in FPConstantMap if safe.
+ && (FPConstantMap.find(FPC) == FPConstantMap.end())) {
+ double Val = FPC->getValue();
+
+ FPConstantMap[FPC] = FPCounter; // Number the FP constants
+
+ if (FPC->getType() == Type::DoubleTy)
+ Out << " const ConstantDoubleTy FloatConstant" << FPCounter++
+ << " = 0x" << std::hex << *(unsigned long long*)&Val << std::dec
+ << "ULL; /* " << Val << " */\n";
+ else if (FPC->getType() == Type::FloatTy) {
+ float fVal = Val;
+ Out << " const ConstantFloatTy FloatConstant" << FPCounter++
+ << " = 0x" << std::hex << *(unsigned*)&fVal << std::dec
+ << "U; /* " << Val << " */\n";
+ } else
+ assert(0 && "Unknown float type!");
+ }
+
+ Out << "\n";
// print the basic blocks
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
BasicBlock *Prev = BB->getPrev();
// Don't print the label for the basic block if there are no uses, or if the
- // only terminator use is the precessor basic block's terminator. We have
+ // 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.
//
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()) {
+ if (TI != Prev->getTerminator() ||
+ isa<SwitchInst>(Prev->getTerminator()) ||
+ isa<InvokeInst>(Prev->getTerminator())) {
NeedsLabel = true;
break;
}
- if (NeedsLabel) Out << getValueName(BB) << ":\n";
+ 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) && !isa<PHINode>(*II)) {
+ if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
if (II->getType() != Type::VoidTy)
outputLValue(II);
else
}
Out << "}\n\n";
- Table->purgeFunction();
+ FPConstantMap.clear();
}
// Specific Instruction type classes... note that all of the casts are
-// neccesary because we use the instruction classes as opaque types...
+// necessary because we use the instruction classes as opaque types...
//
void CWriter::visitReturnInst(ReturnInst &I) {
// Don't output a void return if this is the last basic block in the function
Out << ";\n";
}
+void CWriter::visitSwitchInst(SwitchInst &SI) {
+ Out << " switch (";
+ writeOperand(SI.getOperand(0));
+ Out << ") {\n default:\n";
+ printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
+ Out << ";\n";
+ for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
+ Out << " case ";
+ writeOperand(SI.getOperand(i));
+ Out << ":\n";
+ BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
+ printBranchToBlock(SI.getParent(), Succ, 2);
+ if (Succ == SI.getParent()->getNext())
+ Out << " break;\n";
+ }
+ Out << " }\n";
+}
+
+void CWriter::visitInvokeInst(InvokeInst &II) {
+ Out << " {\n"
+ << " struct __llvm_jmpbuf_list_t Entry;\n"
+ << " Entry.next = __llvm_jmpbuf_list;\n"
+ << " if (setjmp(Entry.buf)) {\n"
+ << " __llvm_jmpbuf_list = Entry.next;\n";
+ printBranchToBlock(II.getParent(), II.getExceptionalDest(), 4);
+ Out << " }\n"
+ << " __llvm_jmpbuf_list = &Entry;\n"
+ << " ";
+
+ if (II.getType() != Type::VoidTy) outputLValue(&II);
+ visitCallSite(&II);
+ Out << ";\n"
+ << " __llvm_jmpbuf_list = Entry.next;\n"
+ << " }\n";
+ printBranchToBlock(II.getParent(), II.getNormalDest(), 0);
+ emittedInvoke = true;
+}
+
+
+void CWriter::visitUnwindInst(UnwindInst &I) {
+ // The unwind instructions causes a control flow transfer out of the current
+ // function, unwinding the stack until a caller who used the invoke
+ // instruction is found. In this context, we code generated the invoke
+ // instruction to add an entry to the top of the jmpbuf_list. Thus, here we
+ // just have to longjmp to the specified handler.
+ Out << " if (__llvm_jmpbuf_list == 0) { /* unwind */\n"
+ << " extern write();\n"
+ << " ((void (*)(int, void*, unsigned))write)(2,\n"
+ << " \"throw found with no handler!\\n\", 31); abort();\n"
+ << " }\n"
+ << " longjmp(__llvm_jmpbuf_list->buf, 1);\n";
+ emittedInvoke = true;
+}
+
static bool isGotoCodeNeccessary(BasicBlock *From, BasicBlock *To) {
// If PHI nodes need copies, we need the copy code...
if (isa<PHINode>(To->front()) ||
}
void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
- unsigned Indent) {
+ unsigned Indent) {
for (BasicBlock::iterator I = Succ->begin();
- PHINode *PN = dyn_cast<PHINode>(&*I); ++I) {
+ PHINode *PN = dyn_cast<PHINode>(I); ++I) {
// now we have to do the printing
- Out << string(Indent, ' ');
- outputLValue(PN);
+ Out << std::string(Indent, ' ');
+ Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
writeOperand(PN->getIncomingValue(PN->getBasicBlockIndex(CurBB)));
Out << "; /* for PHI node */\n";
}
- if (CurBB->getNext() != Succ) {
- Out << string(Indent, ' ') << " goto ";
+ if (CurBB->getNext() != Succ || isa<InvokeInst>(CurBB->getTerminator())) {
+ Out << std::string(Indent, ' ') << " goto ";
writeOperand(Succ);
Out << ";\n";
}
}
-// Brach instruction printing - Avoid printing out a brach to a basic block that
-// immediately succeeds the current one.
+// Branch instruction printing - Avoid printing out a branch to a basic block
+// that immediately succeeds the current one.
//
void CWriter::visitBranchInst(BranchInst &I) {
if (I.isConditional()) {
printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
}
} else {
- // First goto not neccesary, assume second one is...
+ // First goto not necessary, assume second one is...
Out << " if (!";
writeOperand(I.getCondition());
Out << ") {\n";
Out << "\n";
}
+// PHI nodes get copied into temporary values at the end of predecessor basic
+// blocks. We now need to copy these temporary values into the REAL value for
+// the PHI.
+void CWriter::visitPHINode(PHINode &I) {
+ writeOperand(&I);
+ Out << "__PHI_TEMPORARY";
+}
+
void CWriter::visitBinaryOperator(Instruction &I) {
// binary instructions, shift instructions, setCond instructions.
- if (isa<PointerType>(I.getType())) {
- Out << "(";
- printType(I.getType());
- Out << ")";
+ assert(!isa<PointerType>(I.getType()));
+
+ // We must cast the results of binary operations which might be promoted.
+ bool needsCast = false;
+ if ((I.getType() == Type::UByteTy) || (I.getType() == Type::SByteTy)
+ || (I.getType() == Type::UShortTy) || (I.getType() == Type::ShortTy)
+ || (I.getType() == Type::FloatTy)) {
+ needsCast = true;
+ Out << "((";
+ printType(Out, I.getType(), "", false, false);
+ Out << ")(";
}
- if (isa<PointerType>(I.getType())) Out << "(long long)";
writeOperand(I.getOperand(0));
switch (I.getOpcode()) {
default: std::cerr << "Invalid operator type!" << I; abort();
}
- if (isa<PointerType>(I.getType())) Out << "(long long)";
writeOperand(I.getOperand(1));
+
+ if (needsCast) {
+ Out << "))";
+ }
}
void CWriter::visitCastInst(CastInst &I) {
+ if (I.getType() == Type::BoolTy) {
+ Out << "(";
+ writeOperand(I.getOperand(0));
+ Out << " != 0)";
+ return;
+ }
Out << "(";
- printType(I.getType(), string(""),/*ignoreName*/false, /*namedContext*/false);
+ printType(Out, I.getType(), "", /*ignoreName*/false, /*namedContext*/false);
Out << ")";
+ if (isa<PointerType>(I.getType())&&I.getOperand(0)->getType()->isIntegral() ||
+ isa<PointerType>(I.getOperand(0)->getType())&&I.getType()->isIntegral()) {
+ // Avoid "cast to pointer from integer of different size" warnings
+ Out << "(long)";
+ }
+
writeOperand(I.getOperand(0));
}
void CWriter::visitCallInst(CallInst &I) {
- const PointerType *PTy = cast<PointerType>(I.getCalledValue()->getType());
+ // Handle intrinsic function calls first...
+ if (Function *F = I.getCalledFunction())
+ if (LLVMIntrinsic::ID ID = (LLVMIntrinsic::ID)F->getIntrinsicID()) {
+ switch (ID) {
+ default: assert(0 && "Unknown LLVM intrinsic!");
+ case LLVMIntrinsic::va_start:
+ Out << "va_start(*(va_list*)";
+ writeOperand(I.getOperand(1));
+ Out << ", ";
+ // Output the last argument to the enclosing function...
+ writeOperand(&I.getParent()->getParent()->aback());
+ Out << ")";
+ return;
+ case LLVMIntrinsic::va_end:
+ Out << "va_end(*(va_list*)";
+ writeOperand(I.getOperand(1));
+ Out << ")";
+ return;
+ case LLVMIntrinsic::va_copy:
+ Out << "va_copy(*(va_list*)";
+ writeOperand(I.getOperand(1));
+ Out << ", (va_list)";
+ writeOperand(I.getOperand(2));
+ Out << ")";
+ return;
+
+ case LLVMIntrinsic::setjmp:
+ case LLVMIntrinsic::sigsetjmp:
+ // This intrinsic should never exist in the program, but until we get
+ // setjmp/longjmp transformations going on, we should codegen it to
+ // something reasonable. This will allow code that never calls longjmp
+ // to work.
+ Out << "0";
+ return;
+ case LLVMIntrinsic::longjmp:
+ case LLVMIntrinsic::siglongjmp:
+ // Longjmp is not implemented, and never will be. It would cause an
+ // exception throw.
+ Out << "abort()";
+ return;
+ }
+ }
+ visitCallSite(&I);
+}
+
+void CWriter::visitCallSite(CallSite CS) {
+ const PointerType *PTy = cast<PointerType>(CS.getCalledValue()->getType());
const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
const Type *RetTy = FTy->getReturnType();
- writeOperand(I.getOperand(0));
+ writeOperand(CS.getCalledValue());
Out << "(";
- if (I.getNumOperands() > 1) {
- writeOperand(I.getOperand(1));
+ if (CS.arg_begin() != CS.arg_end()) {
+ CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
+ writeOperand(*AI);
- for (unsigned op = 2, Eop = I.getNumOperands(); op != Eop; ++op) {
+ for (++AI; AI != AE; ++AI) {
Out << ", ";
- writeOperand(I.getOperand(op));
+ writeOperand(*AI);
}
}
Out << ")";
void CWriter::visitMallocInst(MallocInst &I) {
Out << "(";
- printType(I.getType());
+ printType(Out, I.getType());
Out << ")malloc(sizeof(";
- printType(I.getType()->getElementType());
+ printType(Out, I.getType()->getElementType());
Out << ")";
if (I.isArrayAllocation()) {
void CWriter::visitAllocaInst(AllocaInst &I) {
Out << "(";
- printType(I.getType());
+ printType(Out, I.getType());
Out << ") alloca(sizeof(";
- printType(I.getType()->getElementType());
+ printType(Out, I.getType()->getElementType());
Out << ")";
if (I.isArrayAllocation()) {
Out << " * " ;
}
void CWriter::visitFreeInst(FreeInst &I) {
- Out << "free(";
+ Out << "free((char*)";
writeOperand(I.getOperand(0));
Out << ")";
}
} else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(Ptr)) {
HasImplicitAddress = true;
Ptr = CPR->getValue(); // Get to the global...
+ } else if (isDirectAlloca(Ptr)) {
+ HasImplicitAddress = true;
}
if (I == E) {
return;
}
- const Constant *CI = dyn_cast<Constant>(I->get());
+ const Constant *CI = dyn_cast<Constant>(I);
if (HasImplicitAddress && (!CI || !CI->isNullValue()))
Out << "(&";
writeOperandInternal(Ptr);
- if (HasImplicitAddress && (!CI || !CI->isNullValue()))
+ if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
Out << ")";
+ HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
+ }
- // Print out the -> operator if possible...
- if (CI && CI->isNullValue() && I+1 != E) {
+ assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
+ "Can only have implicit address with direct accessing");
+
+ if (HasImplicitAddress) {
+ ++I;
+ } else if (CI && CI->isNullValue() && I+1 != E) {
+ // Print out the -> operator if possible...
if ((*(I+1))->getType() == Type::UByteTy) {
Out << (HasImplicitAddress ? "." : "->");
Out << "field" << cast<ConstantUInt>(*(I+1))->getValue();
I += 2;
- } else { // First array index of 0: Just skip it
- ++I;
- }
+ }
}
for (; I != E; ++I)
printIndexingExpression(I.getPointerOperand(), I.idx_begin(), I.idx_end());
}
+void CWriter::visitVarArgInst(VarArgInst &I) {
+ Out << "va_arg((va_list)*";
+ writeOperand(I.getOperand(0));
+ Out << ", ";
+ printType(Out, I.getType(), "", /*ignoreName*/false, /*namedContext*/false);
+ Out << ")";
+}
+
+
//===----------------------------------------------------------------------===//
// External Interface declaration
//===----------------------------------------------------------------------===//
projects / oota-llvm.git / blobdiff