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Mips MC object code emission improvements:

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"With this patch we can now generate runnable Mips code through LLVM
direct object emission. We have run numerous simple programs, both C
and C++ and with -O0 and -O3 from the output. The code is not production
ready, but quite useful for experimentation." Patch and message by
Jack Carter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144414 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2011-11-11 22:58:42 +00:00
parent bee515f66b
commit 47b92f3d83
13 changed files with 475 additions and 130 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
lib/Target/Mips/MipsCodeEmitter.cpp
View File

@ -18,18 +18,20 @@
#include "MipsRelocations.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/PassManager.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/JITCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/PassManager.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
@ -37,8 +39,6 @@
#include <iomanip>
#endif
#include "llvm/CodeGen/MachineOperand.h"
using namespace llvm;
STATISTIC(NumEmitted, "Number of machine instructions emitted");
@ -66,9 +66,9 @@ class MipsCodeEmitter : public MachineFunctionPass {
public:
MipsCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce) :
MachineFunctionPass(ID), JTI(0),
II((const MipsInstrInfo *) tm.getInstrInfo()),
TD(tm.getTargetData()), TM(tm), MCE(mce), MCPEs(0), MJTEs(0),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {
II((const MipsInstrInfo *) tm.getInstrInfo()),
TD(tm.getTargetData()), TM(tm), MCE(mce), MCPEs(0), MJTEs(0),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {
}
bool runOnMachineFunction(MachineFunction &MF);
@ -91,7 +91,7 @@ class MipsCodeEmitter : public MachineFunctionPass {
/// Routines that handle operands which add machine relocations which are
/// fixed up by the relocation stage.
void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
bool MayNeedFarStub) const;
bool MayNeedFarStub) const;
void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
@ -105,6 +105,9 @@ class MipsCodeEmitter : public MachineFunctionPass {
unsigned getRelocation(const MachineInstr &MI,
const MachineOperand &MO) const;
unsigned getJumpTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
unsigned getBranchTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
unsigned getMemEncoding(const MachineInstr &MI, unsigned OpNo) const;
unsigned getSizeExtEncoding(const MachineInstr &MI, unsigned OpNo) const;
unsigned getSizeInsEncoding(const MachineInstr &MI, unsigned OpNo) const;
@ -165,23 +168,34 @@ unsigned MipsCodeEmitter::getRelocation(const MachineInstr &MI,
return Mips::reloc_mips_lo;
}
unsigned MipsCodeEmitter::getJumpTargetOpValue(const MachineInstr &MI,
unsigned OpNo) const {
// FIXME: implement
return 0;
}
unsigned MipsCodeEmitter::getBranchTargetOpValue(const MachineInstr &MI,
unsigned OpNo) const {
// FIXME: implement
return 0;
}
unsigned MipsCodeEmitter::getMemEncoding(const MachineInstr &MI,
unsigned OpNo) const {
unsigned OpNo) const {
// Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo)) << 16;
return
(getMachineOpValue(MI, MI.getOperand(OpNo+1)) & 0xFFFF) | RegBits;
return (getMachineOpValue(MI, MI.getOperand(OpNo+1)) & 0xFFFF) | RegBits;
}
unsigned MipsCodeEmitter::getSizeExtEncoding(const MachineInstr &MI,
unsigned OpNo) const {
unsigned OpNo) const {
// size is encoded as size-1.
return getMachineOpValue(MI, MI.getOperand(OpNo)) - 1;
}
unsigned MipsCodeEmitter::getSizeInsEncoding(const MachineInstr &MI,
unsigned OpNo) const {
unsigned OpNo) const {
// size is encoded as pos+size-1.
return getMachineOpValue(MI, MI.getOperand(OpNo-1)) +
getMachineOpValue(MI, MI.getOperand(OpNo)) - 1;
@ -190,7 +204,7 @@ unsigned MipsCodeEmitter::getSizeInsEncoding(const MachineInstr &MI,
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned MipsCodeEmitter::getMachineOpValue(const MachineInstr &MI,
const MachineOperand &MO) const {
const MachineOperand &MO) const {
if (MO.isReg())
return MipsRegisterInfo::getRegisterNumbering(MO.getReg());
else if (MO.isImm())
@ -217,9 +231,10 @@ unsigned MipsCodeEmitter::getMachineOpValue(const MachineInstr &MI,
}
void MipsCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
bool MayNeedFarStub) const {
bool MayNeedFarStub) const {
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
const_cast<GlobalValue *>(GV), 0, MayNeedFarStub));
const_cast<GlobalValue *>(GV), 0,
MayNeedFarStub));
}
void MipsCodeEmitter::emitGlobalAddressUnaligned(const GlobalValue *GV,
@ -248,7 +263,7 @@ emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
}
void MipsCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
unsigned Reloc) const {
unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
Reloc, BB));
}
@ -395,7 +410,7 @@ void MipsCodeEmitter::emitWordLE(unsigned Word) {
/// createMipsJITCodeEmitterPass - Return a pass that emits the collected Mips
/// code to the specified MCE object.
FunctionPass *llvm::createMipsJITCodeEmitterPass(MipsTargetMachine &TM,
JITCodeEmitter &JCE) {
JITCodeEmitter &JCE) {
return new MipsCodeEmitter(TM, JCE);
}