Added missing patterns for subtract instruction.

[oota-llvm.git] / lib / MC / MCSymbol.cpp

diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp
index 68ab24d9523a37b1cb0a7d959bb4b7923f86ebc0..b145d07f4a68d631e21f400afea76c9cd1034c74 100644 (file)
--- a/lib/MC/MCSymbol.cpp
+++ b/lib/MC/MCSymbol.cpp
@@ -16,40 +16,93 @@ using namespace llvm;
 const MCSection *MCSymbol::AbsolutePseudoSection =
   reinterpret_cast<const MCSection *>(1);
 
-/// ShouldQuoteIdentifier - Return true if the identifier \arg Str needs quotes
-/// for this assembler.
-static bool ShouldQuoteIdentifier(const StringRef &Str, const MCAsmInfo &MAI) {
-  // If the assembler doesn't support quotes, never use them.
-  if (!MAI.doesAllowQuotesInName())
+static bool isAcceptableChar(char C) {
+  if ((C < 'a' || C > 'z') &&
+      (C < 'A' || C > 'Z') &&
+      (C < '0' || C > '9') &&
+      C != '_' && C != '$' && C != '.' && C != '@')
     return false;
+  return true;
+}
+
+static char HexDigit(int V) {
+  return V < 10 ? V+'0' : V+'A'-10;
+}
+
+static void MangleLetter(raw_ostream &OS, unsigned char C) {
+  OS << '_' << HexDigit(C >> 4) << HexDigit(C & 15) << '_';
+}
+
+/// NameNeedsEscaping - Return true if the identifier \arg Str needs quotes
+/// for this assembler.
+static bool NameNeedsEscaping(StringRef Str, const MCAsmInfo &MAI) {
+  assert(!Str.empty() && "Cannot create an empty MCSymbol");
   
-  // If empty, we need quotes.
-  if (Str.empty())
-    return true;
-  
-  // If the first character is a number, we need quotes.
-  if (Str[0] >= '0' && Str[0] <= '9')
+  // If the first character is a number and the target does not allow this, we
+  // need quotes.
+  if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9')
     return true;
 
   // If any of the characters in the string is an unacceptable character, force
   // quotes.
-  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
-    char C = Str[i];
-  
-    if ((C < 'a' || C > 'z') &&
-        (C < 'A' || C > 'Z') &&
-        (C < '0' || C > '9') &&
-        C != '_' && C != '$' && C != '.')
+  for (unsigned i = 0, e = Str.size(); i != e; ++i)
+    if (!isAcceptableChar(Str[i]))
       return true;
-  }
   return false;
 }
 
+static void PrintMangledName(raw_ostream &OS, StringRef Str,
+                             const MCAsmInfo &MAI) {
+  // The first character is not allowed to be a number unless the target
+  // explicitly allows it.
+  if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9') {
+    MangleLetter(OS, Str[0]);
+    Str = Str.substr(1);
+  }
+  
+  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
+    if (!isAcceptableChar(Str[i]))
+      MangleLetter(OS, Str[i]);
+    else
+      OS << Str[i];
+  }
+}
+
+/// PrintMangledQuotedName - On systems that support quoted symbols, we still
+/// have to escape some (obscure) characters like " and \n which would break the
+/// assembler's lexing.
+static void PrintMangledQuotedName(raw_ostream &OS, StringRef Str) {
+  OS << '"';
+
+  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
+    if (Str[i] == '"')
+      OS << "_QQ_";
+    else if (Str[i] == '\n')
+      OS << "_NL_";
+    else
+      OS << Str[i];
+  }
+  OS << '"';
+}
+
+
 void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
-  if (!MAI || ShouldQuoteIdentifier(getName(), *MAI))
-    OS << '"' << getName() << '"';
-  else
+  if (MAI == 0 || !NameNeedsEscaping(getName(), *MAI)) {
     OS << getName();
+    return;
+  }
+
+  // On systems that do not allow quoted names, print with mangling.
+  if (!MAI->doesAllowQuotesInName())
+    return PrintMangledName(OS, getName(), *MAI);
+
+  // If the string contains a double quote or newline, we still have to mangle
+  // it.
+  if (getName().find('"') != std::string::npos ||
+      getName().find('\n') != std::string::npos)
+    return PrintMangledQuotedName(OS, getName());
+    
+  OS << '"' << getName() << '"';
 }
 
 void MCSymbol::dump() const {