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9c661c8e26
will cause an infinite loop. The link bit is only used for calling functions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14466 91177308-0d34-0410-b5e6-96231b3b80d8
665 lines
21 KiB
C++
665 lines
21 KiB
C++
//===-- PPC32/Printer.cpp - Convert X86 LLVM code to Intel assembly ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal
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// representation of machine-dependent LLVM code to Intel-format
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// assembly language. This printer is the output mechanism used
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// by `llc' and `lli -print-machineinstrs' on X86.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asmprinter"
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#include "PowerPC.h"
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#include "PowerPCInstrInfo.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Mangler.h"
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#include "Support/CommandLine.h"
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#include "Support/Debug.h"
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#include "Support/Statistic.h"
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#include "Support/StringExtras.h"
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#include <set>
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namespace llvm {
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namespace {
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Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
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struct Printer : public MachineFunctionPass {
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/// Output stream on which we're printing assembly code.
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///
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std::ostream &O;
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/// Target machine description which we query for reg. names, data
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/// layout, etc.
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///
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TargetMachine &TM;
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/// Name-mangler for global names.
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///
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Mangler *Mang;
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std::set<std::string> Stubs;
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std::set<std::string> Strings;
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Printer(std::ostream &o, TargetMachine &tm) : O(o), TM(tm) { }
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/// Cache of mangled name for current function. This is
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/// recalculated at the beginning of each call to
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/// runOnMachineFunction().
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///
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std::string CurrentFnName;
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virtual const char *getPassName() const {
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return "PowerPC Assembly Printer";
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}
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void printMachineInstruction(const MachineInstr *MI);
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void printOp(const MachineOperand &MO, bool elideOffsetKeyword = false);
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void printConstantPool(MachineConstantPool *MCP);
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(Module &M);
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bool doFinalization(Module &M);
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void emitGlobalConstant(const Constant* CV);
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void emitConstantValueOnly(const Constant *CV);
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};
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} // end of anonymous namespace
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/// createPPCCodePrinterPass - Returns a pass that prints the X86
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/// assembly code for a MachineFunction to the given output stream,
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/// using the given target machine description. This should work
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/// regardless of whether the function is in SSA form.
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///
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FunctionPass *createPPCCodePrinterPass(std::ostream &o,TargetMachine &tm) {
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return new Printer(o, tm);
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}
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/// isStringCompatible - Can we treat the specified array as a string?
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/// Only if it is an array of ubytes or non-negative sbytes.
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///
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static bool isStringCompatible(const ConstantArray *CVA) {
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const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType();
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if (ETy == Type::UByteTy) return true;
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if (ETy != Type::SByteTy) return false;
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for (unsigned i = 0; i < CVA->getNumOperands(); ++i)
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if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0)
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return false;
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return true;
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}
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/// toOctal - Convert the low order bits of X into an octal digit.
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///
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static inline char toOctal(int X) {
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return (X&7)+'0';
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}
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/// getAsCString - Return the specified array as a C compatible
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/// string, only if the predicate isStringCompatible is true.
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///
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static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
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assert(isStringCompatible(CVA) && "Array is not string compatible!");
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O << "\"";
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for (unsigned i = 0; i < CVA->getNumOperands(); ++i) {
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unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
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if (C == '"') {
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O << "\\\"";
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} else if (C == '\\') {
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O << "\\\\";
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} else if (isprint(C)) {
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O << C;
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} else {
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switch(C) {
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case '\b': O << "\\b"; break;
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case '\f': O << "\\f"; break;
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case '\n': O << "\\n"; break;
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case '\r': O << "\\r"; break;
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case '\t': O << "\\t"; break;
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default:
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O << '\\';
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O << toOctal(C >> 6);
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O << toOctal(C >> 3);
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O << toOctal(C >> 0);
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break;
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}
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}
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}
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O << "\"";
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}
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// Print out the specified constant, without a storage class. Only the
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// constants valid in constant expressions can occur here.
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void Printer::emitConstantValueOnly(const Constant *CV) {
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if (CV->isNullValue())
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O << "0";
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else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
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assert(CB == ConstantBool::True);
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O << "1";
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} else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
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O << CI->getValue();
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else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
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O << CI->getValue();
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else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CV))
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// This is a constant address for a global variable or function. Use the
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// name of the variable or function as the address value.
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O << Mang->getValueName(CPR->getValue());
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else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
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const TargetData &TD = TM.getTargetData();
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switch(CE->getOpcode()) {
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case Instruction::GetElementPtr: {
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// generate a symbolic expression for the byte address
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const Constant *ptrVal = CE->getOperand(0);
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std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
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if (unsigned Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) {
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O << "(";
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emitConstantValueOnly(ptrVal);
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O << ") + " << Offset;
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} else {
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emitConstantValueOnly(ptrVal);
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}
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break;
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}
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case Instruction::Cast: {
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// Support only non-converting or widening casts for now, that is, ones
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// that do not involve a change in value. This assertion is really gross,
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// and may not even be a complete check.
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Constant *Op = CE->getOperand(0);
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const Type *OpTy = Op->getType(), *Ty = CE->getType();
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// Remember, kids, pointers on x86 can be losslessly converted back and
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// forth into 32-bit or wider integers, regardless of signedness. :-P
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assert(((isa<PointerType>(OpTy)
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&& (Ty == Type::LongTy || Ty == Type::ULongTy
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|| Ty == Type::IntTy || Ty == Type::UIntTy))
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|| (isa<PointerType>(Ty)
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&& (OpTy == Type::LongTy || OpTy == Type::ULongTy
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|| OpTy == Type::IntTy || OpTy == Type::UIntTy))
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|| (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy))
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&& OpTy->isLosslesslyConvertibleTo(Ty))))
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&& "FIXME: Don't yet support this kind of constant cast expr");
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O << "(";
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emitConstantValueOnly(Op);
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O << ")";
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break;
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}
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case Instruction::Add:
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O << "(";
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emitConstantValueOnly(CE->getOperand(0));
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O << ") + (";
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emitConstantValueOnly(CE->getOperand(1));
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O << ")";
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break;
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default:
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assert(0 && "Unsupported operator!");
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}
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} else {
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assert(0 && "Unknown constant value!");
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}
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}
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// Print a constant value or values, with the appropriate storage class as a
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// prefix.
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void Printer::emitGlobalConstant(const Constant *CV) {
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const TargetData &TD = TM.getTargetData();
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if (CV->isNullValue()) {
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O << "\t.space\t " << TD.getTypeSize(CV->getType()) << "\n";
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return;
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} else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
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if (isStringCompatible(CVA)) {
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O << ".ascii";
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printAsCString(O, CVA);
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O << "\n";
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} else { // Not a string. Print the values in successive locations
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const std::vector<Use> &constValues = CVA->getValues();
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for (unsigned i=0; i < constValues.size(); i++)
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emitGlobalConstant(cast<Constant>(constValues[i].get()));
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}
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return;
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} else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
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// Print the fields in successive locations. Pad to align if needed!
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const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType());
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const std::vector<Use>& constValues = CVS->getValues();
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unsigned sizeSoFar = 0;
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for (unsigned i=0, N = constValues.size(); i < N; i++) {
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const Constant* field = cast<Constant>(constValues[i].get());
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// Check if padding is needed and insert one or more 0s.
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unsigned fieldSize = TD.getTypeSize(field->getType());
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unsigned padSize = ((i == N-1? cvsLayout->StructSize
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: cvsLayout->MemberOffsets[i+1])
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- cvsLayout->MemberOffsets[i]) - fieldSize;
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sizeSoFar += fieldSize + padSize;
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// Now print the actual field value
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emitGlobalConstant(field);
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// Insert the field padding unless it's zero bytes...
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if (padSize)
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O << "\t.space\t " << padSize << "\n";
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}
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assert(sizeSoFar == cvsLayout->StructSize &&
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"Layout of constant struct may be incorrect!");
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return;
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} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
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// FP Constants are printed as integer constants to avoid losing
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// precision...
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double Val = CFP->getValue();
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switch (CFP->getType()->getTypeID()) {
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default: assert(0 && "Unknown floating point type!");
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case Type::FloatTyID: {
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union FU { // Abide by C TBAA rules
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float FVal;
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unsigned UVal;
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} U;
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U.FVal = Val;
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O << ".long\t" << U.UVal << "\t# float " << Val << "\n";
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return;
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}
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case Type::DoubleTyID: {
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union DU { // Abide by C TBAA rules
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double FVal;
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uint64_t UVal;
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struct {
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uint32_t MSWord;
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uint32_t LSWord;
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} T;
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} U;
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U.FVal = Val;
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O << ".long\t" << U.T.MSWord << "\t# double most significant word "
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<< Val << "\n";
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O << ".long\t" << U.T.LSWord << "\t# double least significant word"
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<< Val << "\n";
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return;
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}
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}
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} else if (CV->getType()->getPrimitiveSize() == 64) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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union DU { // Abide by C TBAA rules
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int64_t UVal;
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struct {
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uint32_t MSWord;
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uint32_t LSWord;
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} T;
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} U;
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U.UVal = CI->getRawValue();
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O << ".long\t" << U.T.MSWord << "\t# Double-word most significant word "
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<< U.UVal << "\n";
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O << ".long\t" << U.T.LSWord << "\t# Double-word least significant word"
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<< U.UVal << "\n";
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return;
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}
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}
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const Type *type = CV->getType();
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O << "\t";
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switch (type->getTypeID()) {
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case Type::UByteTyID: case Type::SByteTyID:
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O << ".byte";
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break;
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case Type::UShortTyID: case Type::ShortTyID:
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O << ".short";
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break;
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case Type::BoolTyID:
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case Type::PointerTyID:
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case Type::UIntTyID: case Type::IntTyID:
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O << ".long";
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break;
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case Type::ULongTyID: case Type::LongTyID:
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assert (0 && "Should have already output double-word constant.");
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case Type::FloatTyID: case Type::DoubleTyID:
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assert (0 && "Should have already output floating point constant.");
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default:
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assert (0 && "Can't handle printing this type of thing");
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break;
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}
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O << "\t";
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emitConstantValueOnly(CV);
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O << "\n";
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}
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/// printConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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void Printer::printConstantPool(MachineConstantPool *MCP) {
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const std::vector<Constant*> &CP = MCP->getConstants();
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const TargetData &TD = TM.getTargetData();
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if (CP.empty()) return;
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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O << "\t.const\n";
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O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType())
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<< "\n";
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O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t#"
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<< *CP[i] << "\n";
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emitGlobalConstant(CP[i]);
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}
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}
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/// runOnMachineFunction - This uses the printMachineInstruction()
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/// method to print assembly for each instruction.
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///
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bool Printer::runOnMachineFunction(MachineFunction &MF) {
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// BBNumber is used here so that a given Printer will never give two
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// BBs the same name. (If you have a better way, please let me know!)
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static unsigned BBNumber = 0;
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O << "\n\n";
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// What's my mangled name?
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CurrentFnName = Mang->getValueName(MF.getFunction());
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// Print out constants referenced by the function
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printConstantPool(MF.getConstantPool());
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// Print out labels for the function.
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O << "\t.text\n";
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O << "\t.globl\t" << CurrentFnName << "\n";
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O << "\t.align 5\n";
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O << CurrentFnName << ":\n";
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// Print out code for the function.
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for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
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I != E; ++I) {
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// Print a label for the basic block.
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O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t# "
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<< I->getBasicBlock()->getName() << "\n";
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for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
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II != E; ++II) {
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// Print the assembly for the instruction.
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O << "\t";
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printMachineInstruction(II);
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}
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}
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// We didn't modify anything.
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return false;
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}
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void Printer::printOp(const MachineOperand &MO,
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bool elideOffsetKeyword /* = false */) {
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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int new_symbol;
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switch (MO.getType()) {
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case MachineOperand::MO_VirtualRegister:
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if (Value *V = MO.getVRegValueOrNull()) {
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O << "<" << V->getName() << ">";
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return;
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}
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// FALLTHROUGH
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case MachineOperand::MO_MachineRegister:
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O << LowercaseString(RI.get(MO.getReg()).Name);
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return;
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case MachineOperand::MO_SignExtendedImmed:
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case MachineOperand::MO_UnextendedImmed:
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O << (int)MO.getImmedValue();
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return;
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case MachineOperand::MO_MachineBasicBlock: {
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MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
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O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
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<< "_" << MBBOp->getNumber() << "\t# "
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<< MBBOp->getBasicBlock()->getName();
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return;
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}
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case MachineOperand::MO_PCRelativeDisp:
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std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs";
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abort();
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return;
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case MachineOperand::MO_GlobalAddress:
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if (!elideOffsetKeyword) {
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if (isa<Function>(MO.getGlobal())) {
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Stubs.insert(Mang->getValueName(MO.getGlobal()));
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O << "L" << Mang->getValueName(MO.getGlobal()) << "$stub";
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} else {
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O << Mang->getValueName(MO.getGlobal());
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}
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}
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return;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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return;
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default:
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O << "<unknown operand type>";
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return;
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}
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}
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#if 0
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static inline
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unsigned int ValidOpcodes(const MachineInstr *MI, unsigned int ArgType[5]) {
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int i;
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unsigned int retval = 1;
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for(i = 0; i<5; i++) {
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switch(ArgType[i]) {
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case none:
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break;
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case Gpr:
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case Gpr0:
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Type::UIntTy
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case Simm16:
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case Zimm16:
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case PCRelimm24:
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case Imm24:
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case Imm5:
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case PCRelimm14:
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case Imm14:
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case Imm2:
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case Crf:
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case Imm3:
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case Imm1:
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case Fpr:
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case Imm4:
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case Imm8:
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case Disimm16:
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case Spr:
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case Sgr:
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};
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}
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}
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}
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#endif
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/// printMachineInstruction -- Print out a single PPC32 LLVM instruction
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/// MI in Darwin syntax to the current output stream.
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///
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void Printer::printMachineInstruction(const MachineInstr *MI) {
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unsigned Opcode = MI->getOpcode();
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const TargetInstrInfo &TII = *TM.getInstrInfo();
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const TargetInstrDescriptor &Desc = TII.get(Opcode);
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unsigned int i;
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unsigned int ArgCount = Desc.TSFlags & PPC32II::ArgCountMask;
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unsigned int ArgType[] = {
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(Desc.TSFlags >> PPC32II::Arg0TypeShift) & PPC32II::ArgTypeMask,
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(Desc.TSFlags >> PPC32II::Arg1TypeShift) & PPC32II::ArgTypeMask,
|
|
(Desc.TSFlags >> PPC32II::Arg2TypeShift) & PPC32II::ArgTypeMask,
|
|
(Desc.TSFlags >> PPC32II::Arg3TypeShift) & PPC32II::ArgTypeMask,
|
|
(Desc.TSFlags >> PPC32II::Arg4TypeShift) & PPC32II::ArgTypeMask
|
|
};
|
|
assert(((Desc.TSFlags & PPC32II::VMX) == 0) &&
|
|
"Instruction requires VMX support");
|
|
assert(((Desc.TSFlags & PPC32II::PPC64) == 0) &&
|
|
"Instruction requires 64 bit support");
|
|
//assert ( ValidOpcodes(MI, ArgType) && "Instruction has invalid inputs");
|
|
++EmittedInsts;
|
|
|
|
if (Opcode == PPC32::MovePCtoLR) {
|
|
O << "mflr r0\n";
|
|
O << "\tbc 20,31,L" << CurrentFnName << "$pb\n";
|
|
O << "L" << CurrentFnName << "$pb:\n";
|
|
return;
|
|
}
|
|
|
|
O << TII.getName(MI->getOpcode()) << " ";
|
|
DEBUG(std::cerr << TII.getName(MI->getOpcode()) << " expects "
|
|
<< ArgCount << " args\n");
|
|
|
|
if (Opcode == PPC32::LOADLoAddr) {
|
|
printOp(MI->getOperand(0));
|
|
O << ", ";
|
|
printOp(MI->getOperand(1));
|
|
O << ", lo16(";
|
|
printOp(MI->getOperand(2));
|
|
O << "-L" << CurrentFnName << "$pb)\n";
|
|
} else if (Opcode == PPC32::LOADHiAddr) {
|
|
printOp(MI->getOperand(0));
|
|
O << ", ";
|
|
printOp(MI->getOperand(1));
|
|
O << ", ha16(" ;
|
|
printOp(MI->getOperand(2));
|
|
O << "-L" << CurrentFnName << "$pb)\n";
|
|
} else if (ArgCount == 3 && ArgType[1] == PPC32II::Disimm16) {
|
|
printOp(MI->getOperand(0));
|
|
O << ", ";
|
|
printOp(MI->getOperand(1));
|
|
O << "(";
|
|
if (ArgType[2] == PPC32II::Gpr0 && MI->getOperand(2).getReg() == PPC32::R0)
|
|
O << "0";
|
|
else
|
|
printOp(MI->getOperand(2));
|
|
O << ")\n";
|
|
} else {
|
|
for (i = 0; i < ArgCount; ++i) {
|
|
if (ArgType[i] == PPC32II::Gpr0 &&
|
|
MI->getOperand(i).getReg() == PPC32::R0)
|
|
O << "0";
|
|
else {
|
|
//std::cout << "DEBUG " << (*(TM.getRegisterInfo())).get(MI->getOperand(i).getReg()).Name << "\n";
|
|
printOp(MI->getOperand(i));
|
|
}
|
|
if (ArgCount - 1 == i)
|
|
O << "\n";
|
|
else
|
|
O << ", ";
|
|
}
|
|
}
|
|
}
|
|
|
|
bool Printer::doInitialization(Module &M) {
|
|
Mang = new Mangler(M, true);
|
|
return false; // success
|
|
}
|
|
|
|
// SwitchSection - Switch to the specified section of the executable if we are
|
|
// not already in it!
|
|
//
|
|
static void SwitchSection(std::ostream &OS, std::string &CurSection,
|
|
const char *NewSection) {
|
|
if (CurSection != NewSection) {
|
|
CurSection = NewSection;
|
|
if (!CurSection.empty())
|
|
OS << "\t" << NewSection << "\n";
|
|
}
|
|
}
|
|
|
|
bool Printer::doFinalization(Module &M) {
|
|
const TargetData &TD = TM.getTargetData();
|
|
std::string CurSection;
|
|
|
|
// Print out module-level global variables here.
|
|
for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
|
|
if (I->hasInitializer()) { // External global require no code
|
|
O << "\n\n";
|
|
std::string name = Mang->getValueName(I);
|
|
Constant *C = I->getInitializer();
|
|
unsigned Size = TD.getTypeSize(C->getType());
|
|
unsigned Align = TD.getTypeAlignment(C->getType());
|
|
|
|
if (C->isNullValue() &&
|
|
(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
|
|
I->hasWeakLinkage() /* FIXME: Verify correct */)) {
|
|
SwitchSection(O, CurSection, ".data");
|
|
if (I->hasInternalLinkage())
|
|
O << "\t.local " << name << "\n";
|
|
|
|
O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
|
|
<< "," << (unsigned)TD.getTypeAlignment(C->getType());
|
|
O << "\t\t# ";
|
|
WriteAsOperand(O, I, true, true, &M);
|
|
O << "\n";
|
|
} else {
|
|
switch (I->getLinkage()) {
|
|
case GlobalValue::LinkOnceLinkage:
|
|
case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
|
|
// Nonnull linkonce -> weak
|
|
O << "\t.weak " << name << "\n";
|
|
SwitchSection(O, CurSection, "");
|
|
O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
|
|
break;
|
|
|
|
case GlobalValue::AppendingLinkage:
|
|
// FIXME: appending linkage variables should go into a section of
|
|
// their name or something. For now, just emit them as external.
|
|
case GlobalValue::ExternalLinkage:
|
|
// If external or appending, declare as a global symbol
|
|
O << "\t.globl " << name << "\n";
|
|
// FALL THROUGH
|
|
case GlobalValue::InternalLinkage:
|
|
if (C->isNullValue())
|
|
SwitchSection(O, CurSection, ".bss");
|
|
else
|
|
SwitchSection(O, CurSection, ".data");
|
|
break;
|
|
}
|
|
|
|
O << "\t.align " << Align << "\n";
|
|
O << name << ":\t\t\t\t# ";
|
|
WriteAsOperand(O, I, true, true, &M);
|
|
O << " = ";
|
|
WriteAsOperand(O, C, false, false, &M);
|
|
O << "\n";
|
|
emitGlobalConstant(C);
|
|
}
|
|
}
|
|
|
|
for(std::set<std::string>::iterator i = Stubs.begin(); i != Stubs.end(); ++i)
|
|
{
|
|
O << ".data\n";
|
|
O<<".section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32\n";
|
|
O << "\t.align 2\n";
|
|
O << "L" << *i << "$stub:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
O << "\tmflr r0\n";
|
|
O << "\tbcl 20,31,L0$" << *i << "\n";
|
|
O << "L0$" << *i << ":\n";
|
|
O << "\tmflr r11\n";
|
|
O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
|
|
O << "\tmtlr r0\n";
|
|
O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
|
|
O << "\tmtctr r12\n";
|
|
O << "\tbctr\n";
|
|
O << ".data\n";
|
|
O << ".lazy_symbol_pointer\n";
|
|
O << "L" << *i << "$lazy_ptr:\n";
|
|
O << ".indirect_symbol " << *i << "\n";
|
|
O << ".long dyld_stub_binding_helper\n";
|
|
}
|
|
|
|
delete Mang;
|
|
return false; // success
|
|
}
|
|
|
|
} // End llvm namespace
|