It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 215 insertions, 0 deletions

diff --git a/lib/VMCore/Mangler.cpp b/lib/VMCore/Mangler.cpp
new file mode 100644
index 0000000..353732f
--- /dev/null
+++ b/lib/VMCore/Mangler.cpp
@@ -0,0 +1,215 @@
+//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Unified name mangler for CWriter and assembly backends.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Mangler.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/StringExtras.h"
+using namespace llvm;
+
+static char HexDigit(int V) {
+  return V < 10 ? V+'0' : V+'A'-10;
+}
+
+static std::string MangleLetter(unsigned char C) {
+  char Result[] = { '_', HexDigit(C >> 4), HexDigit(C & 15), '_', 0 };
+  return Result;
+}
+
+/// makeNameProper - We don't want identifier names non-C-identifier characters
+/// in them, so mangle them as appropriate.
+///
+std::string Mangler::makeNameProper(const std::string &X, const char *Prefix) {
+  std::string Result;
+  if (X.empty()) return X;  // Empty names are uniqued by the caller.
+  
+  // If PreserveAsmNames is set, names with asm identifiers are not modified. 
+  if (PreserveAsmNames && X[0] == 1)
+    return X;
+  
+  if (!UseQuotes) {
+    // If X does not start with (char)1, add the prefix.
+    std::string::const_iterator I = X.begin();
+    if (*I != 1)
+      Result = Prefix;
+    else
+      ++I;  // Skip over the marker.
+    
+    // Mangle the first letter specially, don't allow numbers.
+    if (*I >= '0' && *I <= '9')
+      Result += MangleLetter(*I++);
+
+    for (std::string::const_iterator E = X.end(); I != E; ++I) {
+      if (!isCharAcceptable(*I))
+        Result += MangleLetter(*I);
+      else
+        Result += *I;
+    }
+  } else {
+    bool NeedsQuotes = false;
+    
+    std::string::const_iterator I = X.begin();
+    if (*I == 1)
+      ++I;  // Skip over the marker.
+
+    // If the first character is a number, we need quotes.
+    if (*I >= '0' && *I <= '9')
+      NeedsQuotes = true;
+    
+    // Do an initial scan of the string, checking to see if we need quotes or
+    // to escape a '"' or not.
+    if (!NeedsQuotes)
+      for (std::string::const_iterator E = X.end(); I != E; ++I)
+        if (!isCharAcceptable(*I)) {
+          NeedsQuotes = true;
+          break;
+        }
+    
+    // In the common case, we don't need quotes.  Handle this quickly.
+    if (!NeedsQuotes) {
+      if (*X.begin() != 1)
+        return Prefix+X;
+      else
+        return X.substr(1);
+    }
+    
+    // Otherwise, construct the string the expensive way.
+    I = X.begin();
+    
+    // If X does not start with (char)1, add the prefix.
+    if (*I != 1)
+      Result = Prefix;
+    else
+      ++I;   // Skip the marker if present.
+      
+    for (std::string::const_iterator E = X.end(); I != E; ++I) {
+      if (*I == '"')
+        Result += "_QQ_";
+      else
+        Result += *I;
+    }
+    Result = '"' + Result + '"';
+  }
+  return Result;
+}
+
+/// getTypeID - Return a unique ID for the specified LLVM type.
+///
+unsigned Mangler::getTypeID(const Type *Ty) {
+  unsigned &E = TypeMap[Ty];
+  if (E == 0) E = ++TypeCounter;
+  return E;
+}
+
+std::string Mangler::getValueName(const Value *V) {
+  if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
+    return getValueName(GV);
+  
+  std::string &Name = Memo[V];
+  if (!Name.empty())
+    return Name;       // Return the already-computed name for V.
+  
+  // Always mangle local names.
+  Name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
+  return Name;
+}
+
+
+std::string Mangler::getValueName(const GlobalValue *GV) {
+  // Check to see whether we've already named V.
+  std::string &Name = Memo[GV];
+  if (!Name.empty())
+    return Name;       // Return the already-computed name for V.
+
+  // Name mangling occurs as follows:
+  // - If V is an intrinsic function, do not change name at all
+  // - Otherwise, mangling occurs if global collides with existing name.
+  if (isa<Function>(GV) && cast<Function>(GV)->getIntrinsicID()) {
+    Name = GV->getName(); // Is an intrinsic function
+  } else if (!GV->hasName()) {
+    // Must mangle the global into a unique ID.
+    unsigned TypeUniqueID = getTypeID(GV->getType());
+    static unsigned GlobalID = 0;
+    Name = "__unnamed_" + utostr(TypeUniqueID) + "_" + utostr(GlobalID++);
+  } else if (!MangledGlobals.count(GV)) {
+    Name = makeNameProper(GV->getName(), Prefix);
+  } else {
+    unsigned TypeUniqueID = getTypeID(GV->getType());
+    Name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(GV->getName());
+  }
+
+  return Name;
+}
+
+void Mangler::InsertName(GlobalValue *GV,
+                         std::map<std::string, GlobalValue*> &Names) {
+  if (!GV->hasName())   // We must mangle unnamed globals.
+    return;
+
+  // Figure out if this is already used.
+  GlobalValue *&ExistingValue = Names[GV->getName()];
+  if (!ExistingValue) {
+    ExistingValue = GV;
+  } else {
+    // If GV is external but the existing one is static, mangle the existing one
+    if ((GV->hasExternalLinkage() || GV->hasDLLImportLinkage()) &&
+        !(ExistingValue->hasExternalLinkage() || ExistingValue->hasDLLImportLinkage())) {
+      MangledGlobals.insert(ExistingValue);
+      ExistingValue = GV;
+    } else if ((GV->hasExternalLinkage() ||
+                GV->hasDLLImportLinkage()) &&
+               (ExistingValue->hasExternalLinkage() ||
+                ExistingValue->hasDLLImportLinkage()) &&
+               GV->isDeclaration() &&
+               ExistingValue->isDeclaration()) {
+      // If the two globals both have external inkage, and are both external,
+      // don't mangle either of them, we just have some silly type mismatch.
+    } else {
+      // Otherwise, mangle GV
+      MangledGlobals.insert(GV);
+    }
+  }
+}
+
+
+Mangler::Mangler(Module &M, const char *prefix)
+  : Prefix(prefix), UseQuotes(false), PreserveAsmNames(false),
+    Count(0), TypeCounter(0) {
+  std::fill(AcceptableChars, 
+          AcceptableChars+sizeof(AcceptableChars)/sizeof(AcceptableChars[0]),
+            0);
+
+  // Letters and numbers are acceptable.
+  for (unsigned char X = 'a'; X <= 'z'; ++X)
+    markCharAcceptable(X);
+  for (unsigned char X = 'A'; X <= 'Z'; ++X)
+    markCharAcceptable(X);
+  for (unsigned char X = '0'; X <= '9'; ++X)
+    markCharAcceptable(X);
+  
+  // These chars are acceptable.
+  markCharAcceptable('_');
+  markCharAcceptable('$');
+  markCharAcceptable('.');
+    
+  // Calculate which global values have names that will collide when we throw
+  // away type information.
+  std::map<std::string, GlobalValue*> Names;
+  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+    InsertName(I, Names);
+  for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
+    InsertName(I, Names);
+}
+
+// Cause this file to be linked in when Support/Mangler.h is #included
+DEFINING_FILE_FOR(Mangler)