mirror of
https://github.com/c64scene-ar/llvm-6502.git
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915b58d2ed
Align data larger than an L1 cache line on L1 cache line boundary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1228 91177308-0d34-0410-b5e6-96231b3b80d8
615 lines
18 KiB
C++
615 lines
18 KiB
C++
//===-- EmitAssembly.cpp - Emit Sparc Specific .s File ---------------------==//
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//
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// This file implements all of the stuff neccesary to output a .s file from
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// LLVM. The code in this file assumes that the specified module has already
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// been compiled into the internal data structures of the Module.
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//
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// The entry point of this file is the UltraSparc::emitAssembly method.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcInternals.h"
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#include "llvm/Analysis/SlotCalculator.h"
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#include "llvm/Transforms/Linker.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/ConstPoolVals.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Method.h"
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#include "llvm/Module.h"
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#include "llvm/Support/HashExtras.h"
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#include "llvm/Support/StringExtras.h"
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#include <locale.h>
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namespace {
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class SparcAsmPrinter {
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typedef hash_map<const Value*, int> ValIdMap;
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typedef ValIdMap:: iterator ValIdMapIterator;
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typedef ValIdMap::const_iterator ValIdMapConstIterator;
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ostream &toAsm;
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SlotCalculator Table; // map anonymous values to unique integer IDs
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ValIdMap valToIdMap; // used for values not handled by SlotCalculator
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const UltraSparc &Target;
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enum Sections {
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Unknown,
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Text,
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ReadOnlyData,
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InitRWData,
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UninitRWData,
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} CurSection;
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public:
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inline SparcAsmPrinter(ostream &o, const Module *M, const UltraSparc &t)
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: toAsm(o), Table(SlotCalculator(M, true)), Target(t), CurSection(Unknown) {
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emitModule(M);
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}
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private :
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void emitModule(const Module *M);
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void emitMethod(const Method *M);
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void emitGlobalsAndConstants(const Module* module);
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//void processMethodArgument(const MethodArgument *MA);
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void emitBasicBlock(const BasicBlock *BB);
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void emitMachineInst(const MachineInstr *MI);
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void printGlobalVariable(const GlobalVariable* GV);
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void printSingleConstant(const ConstPoolVal* CV, string valID = string(""));
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void printConstant( const ConstPoolVal* CV, string valID = string(""));
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unsigned int printOperands(const MachineInstr *MI, unsigned int opNum);
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void printOneOperand(const MachineOperand &Op);
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bool OpIsBranchTargetLabel(const MachineInstr *MI, unsigned int opNum);
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bool OpIsMemoryAddressBase(const MachineInstr *MI, unsigned int opNum);
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// enterSection - Use this method to enter a different section of the output
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// executable. This is used to only output neccesary section transitions.
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//
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void enterSection(enum Sections S) {
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if (S == CurSection) return; // Only switch section if neccesary
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CurSection = S;
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toAsm << "\n\t.section ";
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switch (S)
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{
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default: assert(0 && "Bad section name!");
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case Text: toAsm << "\".text\""; break;
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case ReadOnlyData: toAsm << "\".rodata\",#alloc"; break;
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case InitRWData: toAsm << "\".data\",#alloc,#write"; break;
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case UninitRWData: toAsm << "\".bss\",#alloc,#write\nBbss.bss:"; break;
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}
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toAsm << "\n";
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}
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string getValidSymbolName(const string &S) {
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string Result;
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// Symbol names in Sparc assembly language have these rules:
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// (a) Must match { letter | _ | . | $ } { letter | _ | . | $ | digit }*
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// (b) A name beginning in "." is treated as a local name.
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// (c) Names beginning with "_" are reserved by ANSI C and shd not be used.
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//
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if (S[0] == '_' || isdigit(S[0]))
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Result += "ll";
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for (unsigned i = 0; i < S.size(); ++i)
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{
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char C = S[i];
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if (C == '_' || C == '.' || C == '$' || isalpha(C) || isdigit(C))
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Result += C;
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else
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{
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Result += '_';
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Result += char('0' + ((unsigned char)C >> 4));
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Result += char('0' + (C & 0xF));
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}
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}
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return Result;
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}
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// getID - Return a valid identifier for the specified value. Base it on
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// the name of the identifier if possible, use a numbered value based on
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// prefix otherwise. FPrefix is always prepended to the output identifier.
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//
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string getID(const Value *V, const char *Prefix, const char *FPrefix = 0) {
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string Result;
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string FP(FPrefix ? FPrefix : ""); // "Forced prefix"
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if (V->hasName()) {
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Result = FP + V->getName();
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} else {
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int valId = Table.getValSlot(V);
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if (valId == -1) {
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ValIdMapConstIterator I = valToIdMap.find(V);
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valId = (I == valToIdMap.end())? (valToIdMap[V] = valToIdMap.size())
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: (*I).second;
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}
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Result = FP + string(Prefix) + itostr(valId);
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}
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return getValidSymbolName(Result);
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}
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// getID Wrappers - Ensure consistent usage...
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string getID(const Module *M) {
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return getID(M, "LLVMModule_");
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}
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string getID(const Method *M) {
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return getID(M, "LLVMMethod_");
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}
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string getID(const BasicBlock *BB) {
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return getID(BB, "LL", (".L_"+getID(BB->getParent())+"_").c_str());
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}
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string getID(const GlobalVariable *GV) {
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return getID(GV, "LLVMGlobal_", ".G_");
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}
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string getID(const ConstPoolVal *CV) {
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return getID(CV, "LLVMConst_", ".C_");
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}
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unsigned getOperandMask(unsigned Opcode) {
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switch (Opcode) {
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case SUBcc: return 1 << 3; // Remove CC argument
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case BA: case BRZ: // Remove Arg #0, which is always null or xcc
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case BRLEZ: case BRLZ:
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case BRNZ: case BRGZ:
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case BRGEZ: return 1 << 0;
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default: return 0; // By default, don't hack operands...
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}
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}
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};
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inline bool
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SparcAsmPrinter::OpIsBranchTargetLabel(const MachineInstr *MI,
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unsigned int opNum) {
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switch (MI->getOpCode()) {
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case JMPLCALL:
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case JMPLRET: return (opNum == 0);
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default: return false;
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}
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}
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inline bool
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SparcAsmPrinter::OpIsMemoryAddressBase(const MachineInstr *MI,
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unsigned int opNum) {
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if (Target.getInstrInfo().isLoad(MI->getOpCode()))
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return (opNum == 0);
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else if (Target.getInstrInfo().isStore(MI->getOpCode()))
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return (opNum == 1);
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else
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return false;
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}
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#define PrintOp1PlusOp2(Op1, Op2) \
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printOneOperand(Op1); \
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toAsm << "+"; \
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printOneOperand(Op2);
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unsigned int
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SparcAsmPrinter::printOperands(const MachineInstr *MI,
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unsigned int opNum)
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{
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const MachineOperand& Op = MI->getOperand(opNum);
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if (OpIsBranchTargetLabel(MI, opNum))
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{
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PrintOp1PlusOp2(Op, MI->getOperand(opNum+1));
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return 2;
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}
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else if (OpIsMemoryAddressBase(MI, opNum))
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{
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toAsm << "[";
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PrintOp1PlusOp2(Op, MI->getOperand(opNum+1));
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toAsm << "]";
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return 2;
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}
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else
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{
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printOneOperand(Op);
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return 1;
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}
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}
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void
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SparcAsmPrinter::printOneOperand(const MachineOperand &op)
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{
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switch (op.getOperandType())
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{
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case MachineOperand::MO_VirtualRegister:
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case MachineOperand::MO_CCRegister:
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case MachineOperand::MO_MachineRegister:
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{
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int RegNum = (int)op.getAllocatedRegNum();
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// ****this code is temporary till NULL Values are fixed
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if (RegNum == 10000) {
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toAsm << "<NULL VALUE>";
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} else {
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toAsm << "%" << Target.getRegInfo().getUnifiedRegName(RegNum);
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}
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break;
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}
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case MachineOperand::MO_PCRelativeDisp:
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{
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const Value *Val = op.getVRegValue();
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if (!Val)
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toAsm << "\t<*NULL Value*>";
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else if (const BasicBlock *BB = dyn_cast<const BasicBlock>(Val))
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toAsm << getID(BB);
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else if (const Method *M = dyn_cast<const Method>(Val))
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toAsm << getID(M);
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else if (const GlobalVariable *GV=dyn_cast<const GlobalVariable>(Val))
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toAsm << getID(GV);
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else if (const ConstPoolVal *CV = dyn_cast<const ConstPoolVal>(Val))
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toAsm << getID(CV);
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else
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toAsm << "<unknown value=" << Val << ">";
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break;
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}
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case MachineOperand::MO_SignExtendedImmed:
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case MachineOperand::MO_UnextendedImmed:
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toAsm << op.getImmedValue();
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break;
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default:
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toAsm << op; // use dump field
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break;
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}
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}
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void
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SparcAsmPrinter::emitMachineInst(const MachineInstr *MI)
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{
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unsigned Opcode = MI->getOpCode();
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if (TargetInstrDescriptors[Opcode].iclass & M_DUMMY_PHI_FLAG)
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return; // IGNORE PHI NODES
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toAsm << "\t" << TargetInstrDescriptors[Opcode].opCodeString << "\t";
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unsigned Mask = getOperandMask(Opcode);
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bool NeedComma = false;
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unsigned N = 1;
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for (unsigned OpNum = 0; OpNum < MI->getNumOperands(); OpNum += N)
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if (! ((1 << OpNum) & Mask)) { // Ignore this operand?
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if (NeedComma) toAsm << ", "; // Handle comma outputing
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NeedComma = true;
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N = printOperands(MI, OpNum);
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}
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else
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N = 1;
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toAsm << endl;
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}
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void
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SparcAsmPrinter::emitBasicBlock(const BasicBlock *BB)
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{
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// Emit a label for the basic block
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toAsm << getID(BB) << ":\n";
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// Get the vector of machine instructions corresponding to this bb.
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const MachineCodeForBasicBlock &MIs = BB->getMachineInstrVec();
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MachineCodeForBasicBlock::const_iterator MII = MIs.begin(), MIE = MIs.end();
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// Loop over all of the instructions in the basic block...
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for (; MII != MIE; ++MII)
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emitMachineInst(*MII);
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toAsm << "\n"; // Seperate BB's with newlines
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}
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void
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SparcAsmPrinter::emitMethod(const Method *M)
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{
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if (M->isExternal()) return;
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// Make sure the slot table has information about this method...
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Table.incorporateMethod(M);
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string methName = getID(M);
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toAsm << "!****** Outputing Method: " << methName << " ******\n";
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enterSection(Text);
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toAsm << "\t.align\t4\n\t.global\t" << methName << "\n";
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//toAsm << "\t.type\t" << methName << ",#function\n";
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toAsm << "\t.type\t" << methName << ", 2\n";
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toAsm << methName << ":\n";
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// Output code for all of the basic blocks in the method...
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for (Method::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
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emitBasicBlock(*I);
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// Output a .size directive so the debugger knows the extents of the function
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toAsm << ".EndOf_" << methName << ":\n\t.size "
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<< methName << ", .EndOf_"
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<< methName << "-" << methName << endl;
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// Put some spaces between the methods
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toAsm << "\n\n";
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// Forget all about M.
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Table.purgeMethod();
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}
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inline bool
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ArrayTypeIsString(ArrayType* arrayType)
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{
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return (arrayType->getElementType() == Type::UByteTy ||
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arrayType->getElementType() == Type::SByteTy);
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}
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inline const string
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TypeToDataDirective(const Type* type)
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{
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switch(type->getPrimitiveID())
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{
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case Type::BoolTyID: case Type::UByteTyID: case Type::SByteTyID:
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return ".byte";
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case Type::UShortTyID: case Type::ShortTyID:
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return ".half";
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case Type::UIntTyID: case Type::IntTyID:
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return ".word";
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case Type::ULongTyID: case Type::LongTyID: case Type::PointerTyID:
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return ".xword";
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case Type::FloatTyID:
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return ".single";
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case Type::DoubleTyID:
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return ".double";
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case Type::ArrayTyID:
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if (ArrayTypeIsString((ArrayType*) type))
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return ".ascii";
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else
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return "<InvaliDataTypeForPrinting>";
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default:
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return "<InvaliDataTypeForPrinting>";
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}
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}
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inline unsigned int
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ConstantToSize(const ConstPoolVal* CV, const TargetMachine& target)
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{
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if (ConstPoolArray* AV = dyn_cast<ConstPoolArray>(CV))
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if (ArrayTypeIsString((ArrayType*) CV->getType()))
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return 1 + AV->getNumOperands();
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return target.findOptimalStorageSize(CV->getType());
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}
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inline
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unsigned int TypeToSize(const Type* type, const TargetMachine& target)
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{
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return target.findOptimalStorageSize(type);
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}
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// Align data larger than one L1 cache line on L1 cache line boundaries.
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// Align all smaller types on the next higher 2^x boundary (4, 8, ...).
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//
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inline unsigned int
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TypeToAlignment(const Type* type, const TargetMachine& target)
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{
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unsigned int typeSize = target.findOptimalStorageSize(type);
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unsigned short cacheLineSize = target.getCacheInfo().getCacheLineSize(1);
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if (typeSize > (int) cacheLineSize / 2)
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return cacheLineSize;
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else
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for (unsigned sz=1; /*no condition*/; sz *= 2)
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if (sz >= typeSize)
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return sz;
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}
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void
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SparcAsmPrinter::printSingleConstant(const ConstPoolVal* CV,string valID)
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{
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if (valID.length() == 0)
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valID = getID(CV);
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assert(CV->getType() != Type::VoidTy &&
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CV->getType() != Type::TypeTy &&
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CV->getType() != Type::LabelTy &&
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"Unexpected type for ConstPoolVal");
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assert((! isa<ConstPoolArray>( CV) && ! isa<ConstPoolStruct>(CV))
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&& "Collective types should be handled outside this function");
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toAsm << "\t"
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<< TypeToDataDirective(CV->getType()) << "\t";
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if (CV->getType()->isPrimitiveType())
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{
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if (CV->getType() == Type::FloatTy || CV->getType() == Type::DoubleTy)
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toAsm << "0r"; // FP constants must have this prefix
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toAsm << CV->getStrValue() << endl;
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}
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else if (ConstPoolPointer* CPP = dyn_cast<ConstPoolPointer>(CV))
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{
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if (! CPP->isNullValue())
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assert(0 && "Cannot yet print non-null pointer constants to assembly");
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else
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toAsm << (void*) NULL << endl;
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}
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else if (ConstPoolPointerRef* CPRef = dyn_cast<ConstPoolPointerRef>(CV))
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{
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assert(0 && "Cannot yet initialize pointer refs in assembly");
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}
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else
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{
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assert(0 && "Unknown elementary type for constant");
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}
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}
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void
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SparcAsmPrinter::printConstant(const ConstPoolVal* CV, string valID)
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{
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if (valID.length() == 0)
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valID = getID(CV);
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assert(CV->getType() != Type::VoidTy &&
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CV->getType() != Type::TypeTy &&
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CV->getType() != Type::LabelTy &&
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"Unexpected type for ConstPoolVal");
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toAsm << "\t.align\t" << TypeToAlignment(CV->getType(), Target)
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<< endl;
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// Print .size and .type only if it is not a string.
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ConstPoolArray *CPA = dyn_cast<ConstPoolArray>(CV);
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if (CPA && isStringCompatible(CPA))
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{ // print it as a string and return
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toAsm << valID << ":" << endl;
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toAsm << "\t" << TypeToDataDirective(CV->getType()) << "\t"
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<< getAsCString(CPA) << endl;
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return;
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}
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toAsm << "\t.type" << "\t" << valID << ",#object" << endl;
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toAsm << "\t.size" << "\t" << valID << ","
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<< ConstantToSize(CV, Target) << endl;
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toAsm << valID << ":" << endl;
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if (CPA)
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{ // Not a string. Print the values in successive locations
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const vector<Use>& constValues = CPA->getValues();
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for (unsigned i=1; i < constValues.size(); i++)
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this->printSingleConstant(cast<ConstPoolVal>(constValues[i].get()));
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}
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else if (ConstPoolStruct *CPS = dyn_cast<ConstPoolStruct>(CV))
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{ // Print the fields in successive locations
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const vector<Use>& constValues = CPA->getValues();
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for (unsigned i=1; i < constValues.size(); i++)
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this->printSingleConstant(cast<ConstPoolVal>(constValues[i].get()));
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}
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else
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this->printSingleConstant(CV, valID);
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}
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void
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SparcAsmPrinter::printGlobalVariable(const GlobalVariable* GV)
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{
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toAsm << "\t.global\t" << getID(GV) << endl;
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if (GV->hasInitializer())
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printConstant(GV->getInitializer(), getID(GV));
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else {
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toAsm << "\t.align\t"
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|
<< TypeToAlignment(GV->getType()->getValueType(), Target) << endl;
|
|
toAsm << "\t.type\t" << getID(GV) << ",#object" << endl;
|
|
toAsm << "\t.reserve\t" << getID(GV) << ","
|
|
<< TypeToSize(GV->getType()->getValueType(), Target)
|
|
<< endl;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
FoldConstPools(const Module *M,
|
|
hash_set<const ConstPoolVal*>& moduleConstPool)
|
|
{
|
|
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
|
|
if (! (*I)->isExternal())
|
|
{
|
|
const hash_set<const ConstPoolVal*>& pool =
|
|
MachineCodeForMethod::get(*I).getConstantPoolValues();
|
|
moduleConstPool.insert(pool.begin(), pool.end());
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
SparcAsmPrinter::emitGlobalsAndConstants(const Module *M)
|
|
{
|
|
// First, get the constants there were marked by the code generator for
|
|
// inclusion in the assembly code data area and fold them all into a
|
|
// single constant pool since there may be lots of duplicates. Also,
|
|
// lets force these constants into the slot table so that we can get
|
|
// unique names for unnamed constants also.
|
|
//
|
|
hash_set<const ConstPoolVal*> moduleConstPool;
|
|
FoldConstPools(M, moduleConstPool);
|
|
|
|
// Now, emit the three data sections separately; the cost of I/O should
|
|
// make up for the cost of extra passes over the globals list!
|
|
//
|
|
// Read-only data section (implies initialized)
|
|
for (Module::const_giterator GI=M->gbegin(), GE=M->gend(); GI != GE; ++GI)
|
|
{
|
|
const GlobalVariable* GV = *GI;
|
|
if (GV->hasInitializer() && GV->isConstant())
|
|
{
|
|
if (GI == M->gbegin())
|
|
enterSection(ReadOnlyData);
|
|
printGlobalVariable(GV);
|
|
}
|
|
}
|
|
|
|
for (hash_set<const ConstPoolVal*>::const_iterator I=moduleConstPool.begin(),
|
|
E = moduleConstPool.end(); I != E; ++I)
|
|
printConstant(*I);
|
|
|
|
// Initialized read-write data section
|
|
for (Module::const_giterator GI=M->gbegin(), GE=M->gend(); GI != GE; ++GI)
|
|
{
|
|
const GlobalVariable* GV = *GI;
|
|
if (GV->hasInitializer() && ! GV->isConstant())
|
|
{
|
|
if (GI == M->gbegin())
|
|
enterSection(InitRWData);
|
|
printGlobalVariable(GV);
|
|
}
|
|
}
|
|
|
|
// Uninitialized read-write data section
|
|
for (Module::const_giterator GI=M->gbegin(), GE=M->gend(); GI != GE; ++GI)
|
|
{
|
|
const GlobalVariable* GV = *GI;
|
|
if (! GV->hasInitializer())
|
|
{
|
|
if (GI == M->gbegin())
|
|
enterSection(UninitRWData);
|
|
printGlobalVariable(GV);
|
|
}
|
|
}
|
|
|
|
toAsm << endl;
|
|
}
|
|
|
|
|
|
void
|
|
SparcAsmPrinter::emitModule(const Module *M)
|
|
{
|
|
// TODO: Look for a filename annotation on M to emit a .file directive
|
|
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
|
|
emitMethod(*I);
|
|
|
|
emitGlobalsAndConstants(M);
|
|
}
|
|
|
|
} // End anonymous namespace
|
|
|
|
|
|
//
|
|
// emitAssembly - Output assembly language code (a .s file) for the specified
|
|
// method. The specified method must have been compiled before this may be
|
|
// used.
|
|
//
|
|
void
|
|
UltraSparc::emitAssembly(const Module *M, ostream &toAsm) const
|
|
{
|
|
SparcAsmPrinter Print(toAsm, M, *this);
|
|
}
|