X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCSymbol.cpp;h=c2fad1674aa4308e769ae6db771771ea1db3d34a;hb=3ca2ad11567f83883ae2719c5fac5afc30c7b3d1;hp=d032017ca472ee375d3181767280358fe1c834fb;hpb=1689e0cf55205042b830fdbe3fc5f7b483997334;p=oota-llvm.git

diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp
index d032017ca47..c2fad1674aa 100644
--- a/lib/MC/MCSymbol.cpp
+++ b/lib/MC/MCSymbol.cpp
@@ -8,42 +8,77 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
-
 using namespace llvm;
 
-/// NeedsQuoting - Return true if the string \arg Str needs quoting, i.e., it
-/// does not match [a-zA-Z_.][a-zA-Z0-9_.]*.
-//
-// FIXME: This could be more permissive, do we care?
-static inline bool NeedsQuoting(const StringRef &Str) {
-  if (Str.empty())
-    return true;
-
-  // Check that first character is in [a-zA-Z_.].
-  if (!((Str[0] >= 'a' && Str[0] <= 'z') ||
-        (Str[0] >= 'A' && Str[0] <= 'Z') ||
-        (Str[0] == '_' || Str[0] == '.')))
-    return true;
-
-  // Check subsequent characters are in [a-zA-Z0-9_.].
-  for (unsigned i = 1, e = Str.size(); i != e; ++i)
-    if (!((Str[i] >= 'a' && Str[i] <= 'z') ||
-          (Str[i] >= 'A' && Str[i] <= 'Z') ||
-          (Str[i] >= '0' && Str[i] <= '9') ||
-          (Str[i] == '_' || Str[i] == '.')))
-      return true;
+// Sentinel value for the absolute pseudo section.
+const MCSection *MCSymbol::AbsolutePseudoSection =
+  reinterpret_cast<const MCSection *>(1);
 
+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;
+}
+
+/// NameNeedsQuoting - Return true if the identifier \arg Str needs quotes to be
+/// syntactically correct.
+static bool NameNeedsQuoting(StringRef Str) {
+  assert(!Str.empty() && "Cannot create an empty MCSymbol");
+  
+  // If any of the characters in the string is an unacceptable character, force
+  // quotes.
+  for (unsigned i = 0, e = Str.size(); i != e; ++i)
+    if (!isAcceptableChar(Str[i]))
+      return true;
   return false;
 }
 
+const MCSymbol &MCSymbol::AliasedSymbol() const {
+  const MCSymbol *S = this;
+  while (S->isVariable()) {
+    const MCExpr *Value = S->getVariableValue();
+    if (Value->getKind() != MCExpr::SymbolRef)
+      return *S;
+    const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
+    S = &Ref->getSymbol();
+  }
+  return *S;
+}
+
+void MCSymbol::setVariableValue(const MCExpr *Value) {
+  assert(!IsUsed && "Cannot set a variable that has already been used.");
+  assert(Value && "Invalid variable value!");
+  assert((isUndefined() || (isAbsolute() && isa<MCConstantExpr>(Value))) &&
+         "Invalid redefinition!");
+  this->Value = Value;
+
+  // Variables should always be marked as in the same "section" as the value.
+  const MCSection *Section = Value->FindAssociatedSection();
+  if (Section) {
+    setSection(*Section);
+  } else {
+    setUndefined();
+  }
+}
+
 void MCSymbol::print(raw_ostream &OS) const {
-  if (NeedsQuoting(getName()))
-    OS << '"' << getName() << '"';
-  else
+  // The name for this MCSymbol is required to be a valid target name.  However,
+  // some targets support quoting names with funny characters.  If the name
+  // contains a funny character, then print it quoted.
+  if (!NameNeedsQuoting(getName())) {
     OS << getName();
+    return;
+  }
+    
+  OS << '"' << getName() << '"';
 }
 
 void MCSymbol::dump() const {
-  print(errs());
+  print(dbgs());
 }