split inline asm support out to its own .cpp file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100340 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 315 insertions, 0 deletions

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp b/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
new file mode 100644
index 0000000000..d776351a35
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
@@ -0,0 +1,315 @@
+//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AsmPrinter class.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asm-printer"
+#include "llvm/InlineAsm.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cerrno>  // FIXME: Stop using this.
+using namespace llvm;
+
+/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
+void AsmPrinter::EmitInlineAsm(StringRef Str) const {
+  assert(!Str.empty() && "Can't emit empty inline asm block");
+  
+  // If the output streamer is actually a .s file, just emit the blob textually.
+  // This is useful in case the asm parser doesn't handle something but the
+  // system assembler does.
+  if (OutStreamer.hasRawTextSupport()) {
+    OutStreamer.EmitRawText(Str);
+    return;
+  }
+  
+  errs() << "Inline asm not supported by this streamer!\n";
+}
+
+
+/// EmitInlineAsm - This method formats and emits the specified machine
+/// instruction that is an inline asm.
+void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
+  assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
+  
+  unsigned NumOperands = MI->getNumOperands();
+  
+  // Count the number of register definitions to find the asm string.
+  unsigned NumDefs = 0;
+  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
+       ++NumDefs)
+    assert(NumDefs != NumOperands-1 && "No asm string?");
+  
+  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
+
+  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
+  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
+
+  // If this asmstr is empty, just print the #APP/#NOAPP markers.
+  // These are useful to see where empty asm's wound up.
+  if (AsmStr[0] == 0) {
+    if (!OutStreamer.hasRawTextSupport()) return;
+
+    OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
+                            MAI->getInlineAsmStart());
+    OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
+                            MAI->getInlineAsmEnd());
+    return;
+  }
+
+  // Emit the #APP start marker.  This has to happen even if verbose-asm isn't
+  // enabled, so we use EmitRawText.
+  if (OutStreamer.hasRawTextSupport())
+    OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
+                            MAI->getInlineAsmStart());
+
+  // Emit the inline asm to a temporary string so we can emit it through
+  // EmitInlineAsm.
+  SmallString<256> StringData;
+  raw_svector_ostream OS(StringData);
+  
+  OS << '\t';
+
+  // The variant of the current asmprinter.
+  int AsmPrinterVariant = MAI->getAssemblerDialect();
+
+  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
+  const char *LastEmitted = AsmStr; // One past the last character emitted.
+  
+  while (*LastEmitted) {
+    switch (*LastEmitted) {
+    default: {
+      // Not a special case, emit the string section literally.
+      const char *LiteralEnd = LastEmitted+1;
+      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
+             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
+        ++LiteralEnd;
+      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
+        OS.write(LastEmitted, LiteralEnd-LastEmitted);
+      LastEmitted = LiteralEnd;
+      break;
+    }
+    case '\n':
+      ++LastEmitted;   // Consume newline character.
+      OS << '\n';       // Indent code with newline.
+      break;
+    case '$': {
+      ++LastEmitted;   // Consume '$' character.
+      bool Done = true;
+
+      // Handle escapes.
+      switch (*LastEmitted) {
+      default: Done = false; break;
+      case '$':     // $$ -> $
+        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
+          OS << '$';
+        ++LastEmitted;  // Consume second '$' character.
+        break;
+      case '(':             // $( -> same as GCC's { character.
+        ++LastEmitted;      // Consume '(' character.
+        if (CurVariant != -1) {
+          llvm_report_error("Nested variants found in inline asm string: '"
+                            + std::string(AsmStr) + "'");
+        }
+        CurVariant = 0;     // We're in the first variant now.
+        break;
+      case '|':
+        ++LastEmitted;  // consume '|' character.
+        if (CurVariant == -1)
+          OS << '|';       // this is gcc's behavior for | outside a variant
+        else
+          ++CurVariant;   // We're in the next variant.
+        break;
+      case ')':         // $) -> same as GCC's } char.
+        ++LastEmitted;  // consume ')' character.
+        if (CurVariant == -1)
+          OS << '}';     // this is gcc's behavior for } outside a variant
+        else 
+          CurVariant = -1;
+        break;
+      }
+      if (Done) break;
+      
+      bool HasCurlyBraces = false;
+      if (*LastEmitted == '{') {     // ${variable}
+        ++LastEmitted;               // Consume '{' character.
+        HasCurlyBraces = true;
+      }
+      
+      // If we have ${:foo}, then this is not a real operand reference, it is a
+      // "magic" string reference, just like in .td files.  Arrange to call
+      // PrintSpecial.
+      if (HasCurlyBraces && *LastEmitted == ':') {
+        ++LastEmitted;
+        const char *StrStart = LastEmitted;
+        const char *StrEnd = strchr(StrStart, '}');
+        if (StrEnd == 0)
+          llvm_report_error(Twine("Unterminated ${:foo} operand in inline asm"
+                                  " string: '") + Twine(AsmStr) + "'");
+        
+        std::string Val(StrStart, StrEnd);
+        PrintSpecial(MI, OS, Val.c_str());
+        LastEmitted = StrEnd+1;
+        break;
+      }
+            
+      const char *IDStart = LastEmitted;
+      char *IDEnd;
+      errno = 0;
+      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
+      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
+        llvm_report_error("Bad $ operand number in inline asm string: '" 
+                          + std::string(AsmStr) + "'");
+      }
+      LastEmitted = IDEnd;
+      
+      char Modifier[2] = { 0, 0 };
+      
+      if (HasCurlyBraces) {
+        // If we have curly braces, check for a modifier character.  This
+        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
+        if (*LastEmitted == ':') {
+          ++LastEmitted;    // Consume ':' character.
+          if (*LastEmitted == 0) {
+            llvm_report_error("Bad ${:} expression in inline asm string: '" 
+                              + std::string(AsmStr) + "'");
+          }
+          
+          Modifier[0] = *LastEmitted;
+          ++LastEmitted;    // Consume modifier character.
+        }
+        
+        if (*LastEmitted != '}') {
+          llvm_report_error("Bad ${} expression in inline asm string: '" 
+                            + std::string(AsmStr) + "'");
+        }
+        ++LastEmitted;    // Consume '}' character.
+      }
+      
+      if ((unsigned)Val >= NumOperands-1) {
+        llvm_report_error("Invalid $ operand number in inline asm string: '" 
+                          + std::string(AsmStr) + "'");
+      }
+      
+      // Okay, we finally have a value number.  Ask the target to print this
+      // operand!
+      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
+        unsigned OpNo = 1;
+
+        bool Error = false;
+
+        // Scan to find the machine operand number for the operand.
+        for (; Val; --Val) {
+          if (OpNo >= MI->getNumOperands()) break;
+          unsigned OpFlags = MI->getOperand(OpNo).getImm();
+          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
+        }
+
+        if (OpNo >= MI->getNumOperands()) {
+          Error = true;
+        } else {
+          unsigned OpFlags = MI->getOperand(OpNo).getImm();
+          ++OpNo;  // Skip over the ID number.
+
+          if (Modifier[0] == 'l')  // labels are target independent
+            // FIXME: What if the operand isn't an MBB, report error?
+            OS << *MI->getOperand(OpNo).getMBB()->getSymbol();
+          else {
+            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
+            if ((OpFlags & 7) == 4) {
+              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
+                                                Modifier[0] ? Modifier : 0,
+                                                OS);
+            } else {
+              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
+                                          Modifier[0] ? Modifier : 0, OS);
+            }
+          }
+        }
+        if (Error) {
+          std::string msg;
+          raw_string_ostream Msg(msg);
+          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
+          MI->print(Msg);
+          llvm_report_error(Msg.str());
+        }
+      }
+      break;
+    }
+    }
+  }
+  OS << "\n";
+  
+  EmitInlineAsm(OS.str());
+  
+  // Emit the #NOAPP end marker.  This has to happen even if verbose-asm isn't
+  // enabled, so we use EmitRawText.
+  if (OutStreamer.hasRawTextSupport())
+    OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
+                            MAI->getInlineAsmEnd());
+}
+
+
+/// PrintSpecial - Print information related to the specified machine instr
+/// that is independent of the operand, and may be independent of the instr
+/// itself.  This can be useful for portably encoding the comment character
+/// or other bits of target-specific knowledge into the asmstrings.  The
+/// syntax used is ${:comment}.  Targets can override this to add support
+/// for their own strange codes.
+void AsmPrinter::PrintSpecial(const MachineInstr *MI, raw_ostream &OS,
+                              const char *Code) const {
+  if (!strcmp(Code, "private")) {
+    OS << MAI->getPrivateGlobalPrefix();
+  } else if (!strcmp(Code, "comment")) {
+    OS << MAI->getCommentString();
+  } else if (!strcmp(Code, "uid")) {
+    // Comparing the address of MI isn't sufficient, because machineinstrs may
+    // be allocated to the same address across functions.
+    
+    // If this is a new LastFn instruction, bump the counter.
+    if (LastMI != MI || LastFn != getFunctionNumber()) {
+      ++Counter;
+      LastMI = MI;
+      LastFn = getFunctionNumber();
+    }
+    OS << Counter;
+  } else {
+    std::string msg;
+    raw_string_ostream Msg(msg);
+    Msg << "Unknown special formatter '" << Code
+         << "' for machine instr: " << *MI;
+    llvm_report_error(Msg.str());
+  }    
+}
+
+/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
+/// instruction, using the specified assembler variant.  Targets should
+/// override this to format as appropriate.
+bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                                 unsigned AsmVariant, const char *ExtraCode,
+                                 raw_ostream &O) {
+  // Target doesn't support this yet!
+  return true;
+}
+
+bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
+                                       unsigned AsmVariant,
+                                       const char *ExtraCode, raw_ostream &O) {
+  // Target doesn't support this yet!
+  return true;
+}
+