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-rw-r--r--lib/Target/Mips/MipsAsmPrinter.cpp115
1 files changed, 67 insertions, 48 deletions
diff --git a/lib/Target/Mips/MipsAsmPrinter.cpp b/lib/Target/Mips/MipsAsmPrinter.cpp
index bd28a9b..502f744 100644
--- a/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -30,7 +30,7 @@
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
@@ -53,14 +53,14 @@ namespace {
return "Mips Assembly Printer";
}
- bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+ bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
void printUnsignedImm(const MachineInstr *MI, int opNum, raw_ostream &O);
- void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
+ void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier = 0);
- void printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
+ void printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier = 0);
void printSavedRegsBitmask(raw_ostream &O);
void printHex32(unsigned int Value, raw_ostream &O);
@@ -77,7 +77,8 @@ namespace {
}
virtual void EmitFunctionBodyStart();
virtual void EmitFunctionBodyEnd();
- virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
+ virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock*
+ MBB) const;
static const char *getRegisterName(unsigned RegNo);
virtual void EmitFunctionEntryLabel();
@@ -94,12 +95,12 @@ namespace {
// -- Frame directive "frame Stackpointer, Stacksize, RARegister"
// Describe the stack frame.
//
-// -- Mask directives "(f)mask bitmask, offset"
+// -- Mask directives "(f)mask bitmask, offset"
// Tells the assembler which registers are saved and where.
-// bitmask - contain a little endian bitset indicating which registers are
-// saved on function prologue (e.g. with a 0x80000000 mask, the
+// bitmask - contain a little endian bitset indicating which registers are
+// saved on function prologue (e.g. with a 0x80000000 mask, the
// assembler knows the register 31 (RA) is saved at prologue.
-// offset - the position before stack pointer subtraction indicating where
+// offset - the position before stack pointer subtraction indicating where
// the first saved register on prologue is located. (e.g. with a
//
// Consider the following function prologue:
@@ -110,9 +111,9 @@ namespace {
// sw $ra, 40($sp)
// sw $fp, 36($sp)
//
-// With a 0xc0000000 mask, the assembler knows the register 31 (RA) and
-// 30 (FP) are saved at prologue. As the save order on prologue is from
-// left to right, RA is saved first. A -8 offset means that after the
+// With a 0xc0000000 mask, the assembler knows the register 31 (RA) and
+// 30 (FP) are saved at prologue. As the save order on prologue is from
+// left to right, RA is saved first. A -8 offset means that after the
// stack pointer subtration, the first register in the mask (RA) will be
// saved at address 48-8=40.
//
@@ -122,7 +123,7 @@ namespace {
// Mask directives
//===----------------------------------------------------------------------===//
-// Create a bitmask with all callee saved registers for CPU or Floating Point
+// Create a bitmask with all callee saved registers for CPU or Floating Point
// registers. For CPU registers consider RA, GP and FP for saving if necessary.
void MipsAsmPrinter::printSavedRegsBitmask(raw_ostream &O) {
const TargetFrameLowering *TFI = TM.getFrameLowering();
@@ -168,7 +169,7 @@ void MipsAsmPrinter::printSavedRegsBitmask(raw_ostream &O) {
// Print a 32 bit hex number with all numbers.
void MipsAsmPrinter::printHex32(unsigned Value, raw_ostream &O) {
O << "0x";
- for (int i = 7; i >= 0; i--)
+ for (int i = 7; i >= 0; i--)
O << utohexstr((Value & (0xF << (i*4))) >> (i*4));
}
@@ -191,9 +192,9 @@ void MipsAsmPrinter::emitFrameDirective() {
}
/// Emit Set directives.
-const char *MipsAsmPrinter::getCurrentABIString() const {
+const char *MipsAsmPrinter::getCurrentABIString() const {
switch (Subtarget->getTargetABI()) {
- case MipsSubtarget::O32: return "abi32";
+ case MipsSubtarget::O32: return "abi32";
case MipsSubtarget::O64: return "abiO64";
case MipsSubtarget::N32: return "abiN32";
case MipsSubtarget::N64: return "abi64";
@@ -203,7 +204,7 @@ const char *MipsAsmPrinter::getCurrentABIString() const {
llvm_unreachable("Unknown Mips ABI");
return NULL;
-}
+}
void MipsAsmPrinter::EmitFunctionEntryLabel() {
OutStreamer.EmitRawText("\t.ent\t" + Twine(CurrentFnSym->getName()));
@@ -214,7 +215,7 @@ void MipsAsmPrinter::EmitFunctionEntryLabel() {
/// the first basic block in the function.
void MipsAsmPrinter::EmitFunctionBodyStart() {
emitFrameDirective();
-
+
SmallString<128> Str;
raw_svector_ostream OS(Str);
printSavedRegsBitmask(OS);
@@ -226,7 +227,7 @@ void MipsAsmPrinter::EmitFunctionBodyStart() {
void MipsAsmPrinter::EmitFunctionBodyEnd() {
// There are instruction for this macros, but they must
// always be at the function end, and we can't emit and
- // break with BB logic.
+ // break with BB logic.
OutStreamer.EmitRawText(StringRef("\t.set\tmacro"));
OutStreamer.EmitRawText(StringRef("\t.set\treorder"));
OutStreamer.EmitRawText("\t.end\t" + Twine(CurrentFnSym->getName()));
@@ -236,8 +237,8 @@ void MipsAsmPrinter::EmitFunctionBodyEnd() {
/// isBlockOnlyReachableByFallthough - Return true if the basic block has
/// exactly one predecessor and the control transfer mechanism between
/// the predecessor and this block is a fall-through.
-bool MipsAsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB)
- const {
+bool MipsAsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock*
+ MBB) const {
// The predecessor has to be immediately before this block.
const MachineBasicBlock *Pred = *MBB->pred_begin();
@@ -246,16 +247,41 @@ bool MipsAsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock *
if (const BasicBlock *bb = Pred->getBasicBlock())
if (isa<SwitchInst>(bb->getTerminator()))
return false;
+
+ // If this is a landing pad, it isn't a fall through. If it has no preds,
+ // then nothing falls through to it.
+ if (MBB->isLandingPad() || MBB->pred_empty())
+ return false;
+
+ // If there isn't exactly one predecessor, it can't be a fall through.
+ MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
+ ++PI2;
+
+ if (PI2 != MBB->pred_end())
+ return false;
+
+ // The predecessor has to be immediately before this block.
+ if (!Pred->isLayoutSuccessor(MBB))
+ return false;
+
+ // If the block is completely empty, then it definitely does fall through.
+ if (Pred->empty())
+ return true;
- return AsmPrinter::isBlockOnlyReachableByFallthrough(MBB);
+ // Otherwise, check the last instruction.
+ // Check if the last terminator is an unconditional branch.
+ MachineBasicBlock::const_iterator I = Pred->end();
+ while (I != Pred->begin() && !(--I)->getDesc().isTerminator()) ;
+
+ return !I->getDesc().isBarrier();
}
// Print out an operand for an inline asm expression.
-bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,const char *ExtraCode,
raw_ostream &O) {
// Does this asm operand have a single letter operand modifier?
- if (ExtraCode && ExtraCode[0])
+ if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
printOperand(MI, OpNo, O);
@@ -273,22 +299,9 @@ void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
switch(MO.getTargetFlags()) {
case MipsII::MO_GPREL: O << "%gp_rel("; break;
case MipsII::MO_GOT_CALL: O << "%call16("; break;
- case MipsII::MO_GOT: {
- const MachineOperand &LastMO = MI->getOperand(opNum-1);
- bool LastMOIsGP = LastMO.getType() == MachineOperand::MO_Register
- && LastMO.getReg() == Mips::GP;
- if (MI->getOpcode() == Mips::LW || LastMOIsGP)
- O << "%got(";
- else
- O << "%lo(";
- break;
- }
- case MipsII::MO_ABS_HILO:
- if (MI->getOpcode() == Mips::LUi)
- O << "%hi(";
- else
- O << "%lo(";
- break;
+ case MipsII::MO_GOT: O << "%got("; break;
+ case MipsII::MO_ABS_HI: O << "%hi("; break;
+ case MipsII::MO_ABS_LO: O << "%lo("; break;
}
switch (MO.getType()) {
@@ -308,6 +321,12 @@ void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
O << *Mang->getSymbol(MO.getGlobal());
break;
+ case MachineOperand::MO_BlockAddress: {
+ MCSymbol* BA = GetBlockAddressSymbol(MO.getBlockAddress());
+ O << BA->getName();
+ break;
+ }
+
case MachineOperand::MO_ExternalSymbol:
O << *GetExternalSymbolSymbol(MO.getSymbolName());
break;
@@ -323,7 +342,7 @@ void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
if (MO.getOffset())
O << "+" << MO.getOffset();
break;
-
+
default:
llvm_unreachable("<unknown operand type>");
}
@@ -336,7 +355,7 @@ void MipsAsmPrinter::printUnsignedImm(const MachineInstr *MI, int opNum,
const MachineOperand &MO = MI->getOperand(opNum);
if (MO.isImm())
O << (unsigned short int)MO.getImm();
- else
+ else
printOperand(MI, opNum, O);
}
@@ -352,8 +371,8 @@ printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
return;
}
- // Load/Store memory operands -- imm($reg)
- // If PIC target the target is loaded as the
+ // Load/Store memory operands -- imm($reg)
+ // If PIC target the target is loaded as the
// pattern lw $25,%call16($28)
printOperand(MI, opNum, O);
O << "(";
@@ -365,12 +384,12 @@ void MipsAsmPrinter::
printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier) {
const MachineOperand& MO = MI->getOperand(opNum);
- O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm());
+ O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm());
}
void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
// FIXME: Use SwitchSection.
-
+
// Tell the assembler which ABI we are using
OutStreamer.EmitRawText("\t.section .mdebug." + Twine(getCurrentABIString()));
@@ -383,11 +402,11 @@ void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
}
// return to previous section
- OutStreamer.EmitRawText(StringRef("\t.previous"));
+ OutStreamer.EmitRawText(StringRef("\t.previous"));
}
// Force static initialization.
-extern "C" void LLVMInitializeMipsAsmPrinter() {
+extern "C" void LLVMInitializeMipsAsmPrinter() {
RegisterAsmPrinter<MipsAsmPrinter> X(TheMipsTarget);
RegisterAsmPrinter<MipsAsmPrinter> Y(TheMipselTarget);
}
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