wire up skeletal support for having llc print instructions

through mcinst lowering -> mcinstprinter, when llc is passed
the -enable-arm-mcinst-printer flag.  Currently this
is very "aborty".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84530 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp

@@ -1,3 +1,5 @@
+//===-- ARMAsmPrinter.cpp - Print machine code to an ARM .s file ----------===//
+//
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
@@ -13,11 +15,12 @@
 #define DEBUG_TYPE "asm-printer"
 #include "ARM.h"
 #include "ARMBuildAttrs.h"
-#include "ARMTargetMachine.h"
 #include "ARMAddressingModes.h"
 #include "ARMConstantPoolValue.h"
-#include "ARMMachineFunctionInfo.h"
 #include "ARMInstPrinter.h"
+#include "ARMMachineFunctionInfo.h"
+#include "ARMMCInstLower.h"
+#include "ARMTargetMachine.h"
 #include "llvm/Constants.h"
 #include "llvm/Module.h"
 #include "llvm/Assembly/Writer.h"
@@ -28,6 +31,7 @@
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
@@ -40,15 +44,20 @@
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringSet.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Support/MathExtras.h"
-#include "llvm/Support/FormattedStream.h"
 #include <cctype>
 using namespace llvm;
 
 STATISTIC(EmittedInsts, "Number of machine instrs printed");
 
+static cl::opt<bool>
+EnableMCInst("enable-arm-mcinst-printer", cl::Hidden,
+            cl::desc("enable experimental asmprinter gunk in the arm backend"));
+
 namespace {
   class ARMAsmPrinter : public AsmPrinter {
 
@@ -77,7 +86,10 @@ namespace {
     
     void printMCInst(const MCInst *MI) {
       ARMInstPrinter(O, *MAI).printInstruction(MI);
-    }      
+    }
+    
+    void printInstructionThroughMCStreamer(const MachineInstr *MI);
+    
 
     void printOperand(const MachineInstr *MI, int OpNum,
                       const char *Modifier = 0);
@@ -276,14 +288,13 @@ bool ARMAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
        I != E; ++I) {
     // Print a label for the basic block.
-    if (I != MF.begin()) {
+    if (I != MF.begin())
       EmitBasicBlockStart(I);
-    }
+
+    // Print the assembly for the instruction.
     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
-         II != E; ++II) {
-      // Print the assembly for the instruction.
+         II != E; ++II)
       printMachineInstruction(II);
-    }
   }
 
   if (MAI->hasDotTypeDotSizeDirective())
@@ -1026,7 +1037,13 @@ void ARMAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 
   // Call the autogenerated instruction printer routines.
   processDebugLoc(MI, true);
-  printInstruction(MI);
+  
+  if (EnableMCInst) {
+    printInstructionThroughMCStreamer(MI);
+  } else {
+    printInstruction(MI);
+  }
+  
   if (VerboseAsm && !MI->getDebugLoc().isUnknown())
     EmitComments(*MI);
   O << '\n';
@@ -1291,3 +1308,32 @@ extern "C" void LLVMInitializeARMAsmPrinter() {
   RegisterAsmPrinter<ARMAsmPrinter> X(TheARMTarget);
   RegisterAsmPrinter<ARMAsmPrinter> Y(TheThumbTarget);
 }
+
+
+//===----------------------------------------------------------------------===//
+
+void ARMAsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
+  ARMMCInstLower MCInstLowering(OutContext, Mang);
+  switch (MI->getOpcode()) {
+  case TargetInstrInfo::DBG_LABEL:
+  case TargetInstrInfo::EH_LABEL:
+  case TargetInstrInfo::GC_LABEL:
+    printLabel(MI);
+    return;
+  case TargetInstrInfo::KILL:
+    return;
+  case TargetInstrInfo::INLINEASM:
+    O << '\t';
+    printInlineAsm(MI);
+    return;
+  case TargetInstrInfo::IMPLICIT_DEF:
+    printImplicitDef(MI);
+    return;
+  default: break;
+  }
+      
+  MCInst TmpInst;
+  MCInstLowering.Lower(MI, TmpInst);
+  
+  printMCInst(&TmpInst);
+}

lib/Target/ARM/AsmPrinter/CMakeLists.txt

@@ -1,7 +1,8 @@
 include_directories( ${CMAKE_CURRENT_BINARY_DIR}/.. ${CMAKE_CURRENT_SOURCE_DIR}/.. )
 
 add_llvm_library(LLVMARMAsmPrinter
-  ARMInstPrinter.cpp
   ARMAsmPrinter.cpp
+  ARMInstPrinter.cpp
+  ARMMCInstLower.cpp
   )
 add_dependencies(LLVMARMAsmPrinter ARMCodeGenTable_gen)