vendor/llvm/llvm-release_350-r216957

1 files changed, 144 insertions, 0 deletions

diff --git a/lib/IR/Mangler.cpp b/lib/IR/Mangler.cpp
new file mode 100644
index 000000000000..27d973b94f0a
--- /dev/null
+++ b/lib/IR/Mangler.cpp
@@ -0,0 +1,144 @@
+//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Unified name mangler for assembly backends.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/Mangler.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName,
+                              Mangler::ManglerPrefixTy PrefixTy,
+                              const DataLayout &DL, bool UseAt) {
+  SmallString<256> TmpData;
+  StringRef Name = GVName.toStringRef(TmpData);
+  assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
+
+  if (PrefixTy == Mangler::Private)
+    OS << DL.getPrivateGlobalPrefix();
+  else if (PrefixTy == Mangler::LinkerPrivate)
+    OS << DL.getLinkerPrivateGlobalPrefix();
+
+  if (UseAt) {
+    OS << '@';
+  } else {
+    char Prefix = DL.getGlobalPrefix();
+    if (Prefix != '\0')
+      OS << Prefix;
+  }
+
+  // If this is a simple string that doesn't need escaping, just append it.
+  OS << Name;
+}
+
+void Mangler::getNameWithPrefix(raw_ostream &OS, const Twine &GVName,
+                                ManglerPrefixTy PrefixTy) const {
+  return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, false);
+}
+
+void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
+                                const Twine &GVName,
+                                ManglerPrefixTy PrefixTy) const {
+  raw_svector_ostream OS(OutName);
+  return getNameWithPrefix(OS, GVName, PrefixTy);
+}
+
+/// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
+/// a suffix on their name indicating the number of words of arguments they
+/// take.
+static void AddFastCallStdCallSuffix(raw_ostream &OS, const Function *F,
+                                     const DataLayout &TD) {
+  // Calculate arguments size total.
+  unsigned ArgWords = 0;
+  for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
+       AI != AE; ++AI) {
+    Type *Ty = AI->getType();
+    // 'Dereference' type in case of byval or inalloca parameter attribute.
+    if (AI->hasByValOrInAllocaAttr())
+      Ty = cast<PointerType>(Ty)->getElementType();
+    // Size should be aligned to DWORD boundary
+    ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
+  }
+
+  OS << '@' << ArgWords;
+}
+
+void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
+                                bool CannotUsePrivateLabel) const {
+  ManglerPrefixTy PrefixTy = Mangler::Default;
+  if (GV->hasPrivateLinkage()) {
+    if (CannotUsePrivateLabel)
+      PrefixTy = Mangler::LinkerPrivate;
+    else
+      PrefixTy = Mangler::Private;
+  }
+
+  if (!GV->hasName()) {
+    // Get the ID for the global, assigning a new one if we haven't got one
+    // already.
+    unsigned &ID = AnonGlobalIDs[GV];
+    if (ID == 0)
+      ID = NextAnonGlobalID++;
+
+    // Must mangle the global into a unique ID.
+    getNameWithPrefix(OS, "__unnamed_" + Twine(ID), PrefixTy);
+    return;
+  }
+
+  StringRef Name = GV->getName();
+
+  // No need to do anything special if the global has the special "do not
+  // mangle" flag in the name.
+  if (Name[0] == '\1') {
+    OS << Name.substr(1);
+    return;
+  }
+
+  bool UseAt = false;
+  const Function *MSFunc = nullptr;
+  CallingConv::ID CC;
+  if (DL->hasMicrosoftFastStdCallMangling()) {
+    if ((MSFunc = dyn_cast<Function>(GV))) {
+      CC = MSFunc->getCallingConv();
+      // fastcall functions need to start with @ instead of _.
+      if (CC == CallingConv::X86_FastCall)
+        UseAt = true;
+    }
+  }
+
+  getNameWithPrefixx(OS, Name, PrefixTy, *DL, UseAt);
+
+  if (!MSFunc)
+    return;
+
+  // If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
+  // add it.
+  // fastcall and stdcall functions usually need @42 at the end to specify
+  // the argument info.
+  FunctionType *FT = MSFunc->getFunctionType();
+  if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) &&
+      // "Pure" variadic functions do not receive @0 suffix.
+      (!FT->isVarArg() || FT->getNumParams() == 0 ||
+       (FT->getNumParams() == 1 && MSFunc->hasStructRetAttr())))
+    AddFastCallStdCallSuffix(OS, MSFunc, *DL);
+}
+
+void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
+                                const GlobalValue *GV,
+                                bool CannotUsePrivateLabel) const {
+  raw_svector_ostream OS(OutName);
+  getNameWithPrefix(OS, GV, CannotUsePrivateLabel);
+}