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interface with code that uses symbols in the ansi-c protected namespace. In most cases this comes from system header files, such as stdio.h. In particular, without this change, a reference to the __iob symbol is mangled into ll_iob, which is not resolved by libc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4165 91177308-0d34-0410-b5e6-96231b3b80d8
927 lines
28 KiB
C++
927 lines
28 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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// This code largely consists of two LLVM Pass's: a FunctionPass and a Pass.
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// The FunctionPass is pipelined together with all of the rest of the code
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// generation stages, and the Pass runs at the end to emit code for global
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// variables and such.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcInternals.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineCodeForBasicBlock.h"
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#include "llvm/CodeGen/MachineCodeForMethod.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/SlotCalculator.h"
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#include "llvm/Pass.h"
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#include "llvm/Assembly/Writer.h"
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#include "Support/StringExtras.h"
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using std::string;
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namespace {
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class GlobalIdTable: public Annotation {
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static AnnotationID AnnotId;
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friend class AsmPrinter; // give access to AnnotId
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typedef hash_map<const Value*, int> ValIdMap;
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typedef ValIdMap::const_iterator ValIdMapConstIterator;
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typedef ValIdMap:: iterator ValIdMapIterator;
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public:
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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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GlobalIdTable(Module* M) : Annotation(AnnotId), Table(M, true) {}
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};
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AnnotationID GlobalIdTable::AnnotId =
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AnnotationManager::getID("ASM PRINTER GLOBAL TABLE ANNOT");
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//===---------------------------------------------------------------------===//
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// Code Shared By the two printer passes, as a mixin
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//===---------------------------------------------------------------------===//
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class AsmPrinter {
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GlobalIdTable* idTable;
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public:
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std::ostream &toAsm;
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const TargetMachine &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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ZeroInitRWData,
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} CurSection;
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AsmPrinter(std::ostream &os, const TargetMachine &T)
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: idTable(0), toAsm(os), Target(T), CurSection(Unknown) {}
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// (start|end)(Module|Function) - Callback methods to be invoked by subclasses
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void startModule(Module &M) {
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// Create the global id table if it does not already exist
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idTable = (GlobalIdTable*)M.getAnnotation(GlobalIdTable::AnnotId);
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if (idTable == NULL) {
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idTable = new GlobalIdTable(&M);
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M.addAnnotation(idTable);
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}
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}
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void startFunction(Function &F) {
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// Make sure the slot table has information about this function...
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idTable->Table.incorporateFunction(&F);
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}
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void endFunction(Function &) {
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idTable->Table.purgeFunction(); // Forget all about F
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}
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void endModule() {
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}
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// Check if a value is external or accessible from external code.
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bool isExternal(const Value* V) {
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const GlobalValue *GV = dyn_cast<GlobalValue>(V);
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return GV && GV->hasExternalLinkage();
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}
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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 ZeroInitRWData: toAsm << "\".bss\",#alloc,#write"; break;
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}
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toAsm << "\n";
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}
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static 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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//
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if (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 (qualified by the type), and
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// use a numbered value based on prefix otherwise.
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// 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 = FPrefix ? FPrefix : ""; // "Forced prefix"
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Result += V->hasName() ? V->getName() : string(Prefix);
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// Qualify all internal names with a unique id.
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if (!isExternal(V)) {
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int valId = idTable->Table.getValSlot(V);
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if (valId == -1) {
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GlobalIdTable::ValIdMapConstIterator I = idTable->valToIdMap.find(V);
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if (I == idTable->valToIdMap.end())
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valId = idTable->valToIdMap[V] = idTable->valToIdMap.size();
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else
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valId = I->second;
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}
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Result = Result + "_" + 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 Function *F) {
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return getID(F, "LLVMFunction_");
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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_");
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}
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string getID(const Constant *CV) {
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return getID(CV, "LLVMConst_", ".C_");
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}
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string getID(const GlobalValue *GV) {
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if (const GlobalVariable *V = dyn_cast<GlobalVariable>(GV))
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return getID(V);
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else if (const Function *F = dyn_cast<Function>(GV))
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return getID(F);
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assert(0 && "Unexpected type of GlobalValue!");
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return "";
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}
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// ConstantExprToString() - Convert a ConstantExpr to an asm expression
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// and return this as a string.
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string ConstantExprToString(const ConstantExpr* CE,
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const TargetMachine& target) {
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string S;
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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 Value* ptrVal = CE->getOperand(0);
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std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
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S += "(" + valToExprString(ptrVal, target) + ") + ("
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+ utostr(target.DataLayout.getIndexedOffset(ptrVal->getType(),idxVec))
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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 casts for now, i.e., a no-op.
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// This assertion is not a complete check.
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assert(target.DataLayout.getTypeSize(CE->getType()) ==
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target.DataLayout.getTypeSize(CE->getOperand(0)->getType()));
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S += "(" + valToExprString(CE->getOperand(0), target) + ")";
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break;
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case Instruction::Add:
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S += "(" + valToExprString(CE->getOperand(0), target) + ") + ("
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+ valToExprString(CE->getOperand(1), target) + ")";
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break;
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default:
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assert(0 && "Unsupported operator in ConstantExprToString()");
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break;
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}
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return S;
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}
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// valToExprString - Helper function for ConstantExprToString().
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// Appends result to argument string S.
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//
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string valToExprString(const Value* V, const TargetMachine& target) {
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string S;
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bool failed = false;
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if (const Constant* CV = dyn_cast<Constant>(V)) { // symbolic or known
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if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV))
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S += string(CB == ConstantBool::True ? "1" : "0");
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else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
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S += itostr(CI->getValue());
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else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
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S += utostr(CI->getValue());
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else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
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S += ftostr(CFP->getValue());
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else if (isa<ConstantPointerNull>(CV))
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S += "0";
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else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CV))
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S += valToExprString(CPR->getValue(), target);
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else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV))
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S += ConstantExprToString(CE, target);
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else
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failed = true;
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} else if (const GlobalValue* GV = dyn_cast<GlobalValue>(V)) {
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S += getID(GV);
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}
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else
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failed = true;
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if (failed) {
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assert(0 && "Cannot convert value to string");
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S += "<illegal-value>";
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}
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return S;
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}
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};
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//===----------------------------------------------------------------------===//
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// SparcFunctionAsmPrinter Code
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//===----------------------------------------------------------------------===//
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struct SparcFunctionAsmPrinter : public FunctionPass, public AsmPrinter {
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inline SparcFunctionAsmPrinter(std::ostream &os, const TargetMachine &t)
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: AsmPrinter(os, t) {}
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const char *getPassName() const {
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return "Output Sparc Assembly for Functions";
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}
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virtual bool doInitialization(Module &M) {
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startModule(M);
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return false;
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}
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virtual bool runOnFunction(Function &F) {
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startFunction(F);
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emitFunction(F);
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endFunction(F);
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return false;
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}
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virtual bool doFinalization(Module &M) {
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endModule();
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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void emitFunction(const Function &F);
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private :
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void emitBasicBlock(const BasicBlock *BB);
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void emitMachineInst(const MachineInstr *MI);
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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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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: return 1 << 0; // Remove Arg #0, which is always null or xcc
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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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SparcFunctionAsmPrinter::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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SparcFunctionAsmPrinter::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(mop1, mop2) \
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printOneOperand(mop1); \
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toAsm << "+"; \
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printOneOperand(mop2);
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unsigned int
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SparcFunctionAsmPrinter::printOperands(const MachineInstr *MI,
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unsigned int opNum)
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{
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const MachineOperand& mop = MI->getOperand(opNum);
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if (OpIsBranchTargetLabel(MI, opNum))
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{
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PrintOp1PlusOp2(mop, 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(mop, 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(mop);
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return 1;
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}
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}
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void
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SparcFunctionAsmPrinter::printOneOperand(const MachineOperand &mop)
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{
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bool needBitsFlag = true;
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if (mop.opHiBits32())
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toAsm << "%lm(";
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else if (mop.opLoBits32())
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toAsm << "%lo(";
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else if (mop.opHiBits64())
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toAsm << "%hh(";
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else if (mop.opLoBits64())
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toAsm << "%hm(";
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else
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needBitsFlag = false;
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switch (mop.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)mop.getAllocatedRegNum();
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// better to print code with NULL registers than to die
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if (RegNum == Target.getRegInfo().getInvalidRegNum()) {
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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 = mop.getVRegValue();
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assert(Val && "\tNULL Value in SparcFunctionAsmPrinter");
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if (const BasicBlock *BB = dyn_cast<const BasicBlock>(Val))
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toAsm << getID(BB);
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else if (const Function *M = dyn_cast<Function>(Val))
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toAsm << getID(M);
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else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(Val))
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toAsm << getID(GV);
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else if (const Constant *CV = dyn_cast<Constant>(Val))
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toAsm << getID(CV);
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else
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assert(0 && "Unrecognized value in SparcFunctionAsmPrinter");
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break;
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}
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case MachineOperand::MO_SignExtendedImmed:
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toAsm << mop.getImmedValue();
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break;
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case MachineOperand::MO_UnextendedImmed:
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toAsm << (uint64_t) mop.getImmedValue();
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break;
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default:
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toAsm << mop; // use dump field
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break;
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}
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if (needBitsFlag)
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toAsm << ")";
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}
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void
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SparcFunctionAsmPrinter::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 << "\n";
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}
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void
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SparcFunctionAsmPrinter::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 = MachineCodeForBasicBlock::get(BB);
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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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SparcFunctionAsmPrinter::emitFunction(const Function &F)
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{
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string methName = getID(&F);
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toAsm << "!****** Outputing Function: " << methName << " ******\n";
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enterSection(AsmPrinter::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 function...
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for (Function::const_iterator I = F.begin(), E = F.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 << "\n";
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// Put some spaces between the functions
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toAsm << "\n\n";
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}
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} // End anonymous namespace
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Pass *UltraSparc::getFunctionAsmPrinterPass(std::ostream &Out) {
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return new SparcFunctionAsmPrinter(Out, *this);
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}
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//===----------------------------------------------------------------------===//
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// SparcFunctionAsmPrinter Code
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//===----------------------------------------------------------------------===//
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namespace {
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class SparcModuleAsmPrinter : public Pass, public AsmPrinter {
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public:
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SparcModuleAsmPrinter(std::ostream &os, TargetMachine &t)
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: AsmPrinter(os, t) {}
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const char *getPassName() const { return "Output Sparc Assembly for Module"; }
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virtual bool run(Module &M) {
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startModule(M);
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emitGlobalsAndConstants(M);
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endModule();
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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private:
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void emitGlobalsAndConstants (const Module &M);
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void printGlobalVariable (const GlobalVariable *GV);
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void PrintZeroBytesToPad (int numBytes);
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void printSingleConstantValue (const Constant* CV);
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void printConstantValueOnly (const Constant* CV, int numPadBytes = 0);
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void printConstant (const Constant* CV, string valID = "");
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static void FoldConstants (const Module &M,
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hash_set<const Constant*> &moduleConstants);
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};
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// Can we treat the specified array as a string? Only if it is an array of
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// 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 letter
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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 string, only if
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// the predicate isStringCompatible is true.
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//
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static string getAsCString(const ConstantArray *CVA) {
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assert(isStringCompatible(CVA) && "Array is not string compatible!");
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string Result;
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const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType();
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Result = "\"";
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for (unsigned i = 0; i < CVA->getNumOperands(); ++i) {
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unsigned char C = (ETy == Type::SByteTy) ?
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(unsigned char)cast<ConstantSInt>(CVA->getOperand(i))->getValue() :
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(unsigned char)cast<ConstantUInt>(CVA->getOperand(i))->getValue();
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if (C == '"') {
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Result += "\\\"";
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} else if (isprint(C)) {
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Result += C;
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} else {
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switch(C) {
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case '\a': Result += "\\a"; break;
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case '\b': Result += "\\b"; break;
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case '\f': Result += "\\f"; break;
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case '\n': Result += "\\n"; break;
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case '\r': Result += "\\r"; break;
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case '\t': Result += "\\t"; break;
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case '\v': Result += "\\v"; break;
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default:
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Result += '\\';
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Result += toOctal(C >> 6);
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Result += toOctal(C >> 3);
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Result += toOctal(C >> 0);
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break;
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}
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}
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}
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Result += "\"";
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return Result;
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}
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inline bool
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ArrayTypeIsString(const 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 ".word";
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case Type::DoubleTyID:
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return ".xword";
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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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// Get the size of the type
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//
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inline unsigned int
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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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// Get the size of the constant for the given target.
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// If this is an unsized array, return 0.
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//
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inline unsigned int
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ConstantToSize(const Constant* CV, const TargetMachine& target)
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{
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if (const ConstantArray* CVA = dyn_cast<ConstantArray>(CV))
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{
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const ArrayType *aty = cast<ArrayType>(CVA->getType());
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if (ArrayTypeIsString(aty))
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return 1 + CVA->getNumOperands();
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}
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return TypeToSize(CV->getType(), target);
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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 data on the next higher 2^x boundary (4, 8, ...).
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//
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inline unsigned int
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SizeToAlignment(unsigned int size, const TargetMachine& target)
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{
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unsigned short cacheLineSize = target.getCacheInfo().getCacheLineSize(1);
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if (size > (unsigned) 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 >= size)
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return sz;
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}
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// Get the size of the type and then use SizeToAlignment.
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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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return SizeToAlignment(TypeToSize(type, target), target);
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}
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// Get the size of the constant and then use SizeToAlignment.
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// Handles strings as a special case;
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inline unsigned int
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ConstantToAlignment(const Constant* CV, const TargetMachine& target)
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{
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if (const ConstantArray* CVA = dyn_cast<ConstantArray>(CV))
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if (ArrayTypeIsString(cast<ArrayType>(CVA->getType())))
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return SizeToAlignment(1 + CVA->getNumOperands(), target);
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return TypeToAlignment(CV->getType(), target);
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}
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// Print a single constant value.
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void
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SparcModuleAsmPrinter::printSingleConstantValue(const Constant* CV)
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{
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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 Constant");
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assert((!isa<ConstantArray>(CV) && ! isa<ConstantStruct>(CV))
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&& "Aggregate types should be handled outside this function");
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toAsm << "\t" << TypeToDataDirective(CV->getType()) << "\t";
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if (CV->getType()->isPrimitiveType())
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{
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if (CV->getType()->isFloatingPoint()) {
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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 = cast<ConstantFP>(CV)->getValue();
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if (CV->getType() == Type::FloatTy) {
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float FVal = (float)Val;
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char *ProxyPtr = (char*)&FVal; // Abide by C TBAA rules
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toAsm << *(unsigned int*)ProxyPtr;
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} else if (CV->getType() == Type::DoubleTy) {
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char *ProxyPtr = (char*)&Val; // Abide by C TBAA rules
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toAsm << *(uint64_t*)ProxyPtr;
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} else {
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assert(0 && "Unknown floating point type!");
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}
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toAsm << "\t! " << CV->getType()->getDescription()
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<< " value: " << Val << "\n";
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} else {
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WriteAsOperand(toAsm, CV, false, false) << "\n";
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}
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}
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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 method.
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// Use the name of the variable or method as the address value.
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toAsm << getID(CPR->getValue()) << "\n";
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}
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else if (isa<ConstantPointerNull>(CV))
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{ // Null pointer value
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toAsm << "0\n";
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}
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else if (const ConstantExpr* CE = dyn_cast<ConstantExpr>(CV))
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{ // Constant expression built from operators, constants, and symbolic addrs
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toAsm << ConstantExprToString(CE, Target) << "\n";
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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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SparcModuleAsmPrinter::PrintZeroBytesToPad(int numBytes)
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{
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for ( ; numBytes >= 8; numBytes -= 8)
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printSingleConstantValue(Constant::getNullValue(Type::ULongTy));
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if (numBytes >= 4)
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{
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printSingleConstantValue(Constant::getNullValue(Type::UIntTy));
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numBytes -= 4;
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}
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while (numBytes--)
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printSingleConstantValue(Constant::getNullValue(Type::UByteTy));
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}
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// Print a constant value or values (it may be an aggregate).
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// Uses printSingleConstantValue() to print each individual value.
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void
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SparcModuleAsmPrinter::printConstantValueOnly(const Constant* CV,
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int numPadBytes /* = 0*/)
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{
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const ConstantArray *CVA = dyn_cast<ConstantArray>(CV);
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if (numPadBytes)
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PrintZeroBytesToPad(numPadBytes);
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if (CVA && isStringCompatible(CVA))
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{ // print the string alone and return
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toAsm << "\t" << ".ascii" << "\t" << getAsCString(CVA) << "\n";
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}
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else if (CVA)
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{ // 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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printConstantValueOnly(cast<Constant>(constValues[i].get()));
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}
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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 =
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Target.DataLayout.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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{
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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 = Target.DataLayout.getTypeSize(field->getType());
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int 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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printConstantValueOnly(field, padSize);
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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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}
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else
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printSingleConstantValue(CV);
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}
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// Print a constant (which may be an aggregate) prefixed by all the
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// appropriate directives. Uses printConstantValueOnly() to print the
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// value or values.
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void
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SparcModuleAsmPrinter::printConstant(const Constant* 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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toAsm << "\t.align\t" << ConstantToAlignment(CV, Target) << "\n";
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// Print .size and .type only if it is not a string.
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const ConstantArray *CVA = dyn_cast<ConstantArray>(CV);
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if (CVA && isStringCompatible(CVA))
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{ // print it as a string and return
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toAsm << valID << ":\n";
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toAsm << "\t" << ".ascii" << "\t" << getAsCString(CVA) << "\n";
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return;
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}
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toAsm << "\t.type" << "\t" << valID << ",#object\n";
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unsigned int constSize = ConstantToSize(CV, Target);
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if (constSize)
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toAsm << "\t.size" << "\t" << valID << "," << constSize << "\n";
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toAsm << valID << ":\n";
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printConstantValueOnly(CV);
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}
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void SparcModuleAsmPrinter::FoldConstants(const Module &M,
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hash_set<const Constant*> &MC) {
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for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isExternal()) {
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const hash_set<const Constant*> &pool =
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MachineCodeForMethod::get(I).getConstantPoolValues();
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MC.insert(pool.begin(), pool.end());
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}
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}
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void SparcModuleAsmPrinter::printGlobalVariable(const GlobalVariable* GV)
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{
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if (GV->hasExternalLinkage())
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toAsm << "\t.global\t" << getID(GV) << "\n";
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if (GV->hasInitializer() && ! GV->getInitializer()->isNullValue())
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printConstant(GV->getInitializer(), getID(GV));
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else {
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toAsm << "\t.align\t" << TypeToAlignment(GV->getType()->getElementType(),
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Target) << "\n";
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toAsm << "\t.type\t" << getID(GV) << ",#object\n";
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toAsm << "\t.reserve\t" << getID(GV) << ","
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<< TypeToSize(GV->getType()->getElementType(), Target)
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<< "\n";
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}
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}
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void SparcModuleAsmPrinter::emitGlobalsAndConstants(const Module &M) {
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// First, get the constants there were marked by the code generator for
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// inclusion in the assembly code data area and fold them all into a
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// single constant pool since there may be lots of duplicates. Also,
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// lets force these constants into the slot table so that we can get
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// unique names for unnamed constants also.
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//
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hash_set<const Constant*> moduleConstants;
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FoldConstants(M, moduleConstants);
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// Output constants spilled to memory
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enterSection(AsmPrinter::ReadOnlyData);
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for (hash_set<const Constant*>::const_iterator I = moduleConstants.begin(),
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E = moduleConstants.end(); I != E; ++I)
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printConstant(*I);
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// Output global variables...
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for (Module::const_giterator GI = M.gbegin(), GE = M.gend(); GI != GE; ++GI)
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if (! GI->isExternal()) {
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assert(GI->hasInitializer());
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if (GI->isConstant())
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enterSection(AsmPrinter::ReadOnlyData); // read-only, initialized data
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else if (GI->getInitializer()->isNullValue())
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enterSection(AsmPrinter::ZeroInitRWData); // read-write zero data
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else
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enterSection(AsmPrinter::InitRWData); // read-write non-zero data
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printGlobalVariable(GI);
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}
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toAsm << "\n";
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}
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} // End anonymous namespace
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Pass *UltraSparc::getModuleAsmPrinterPass(std::ostream &Out) {
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return new SparcModuleAsmPrinter(Out, *this);
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}
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