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-rw-r--r--contrib/llvm/tools/clang/lib/AST/Mangle.cpp273
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diff --git a/contrib/llvm/tools/clang/lib/AST/Mangle.cpp b/contrib/llvm/tools/clang/lib/AST/Mangle.cpp
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+//===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements generic name mangling support for blocks and Objective-C.
+//
+//===----------------------------------------------------------------------===//
+#include "clang/AST/Attr.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/AST/Mangle.h"
+#include "clang/Basic/ABI.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/TargetInfo.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+
+#define MANGLE_CHECKER 0
+
+#if MANGLE_CHECKER
+#include <cxxabi.h>
+#endif
+
+using namespace clang;
+
+// FIXME: For blocks we currently mimic GCC's mangling scheme, which leaves
+// much to be desired. Come up with a better mangling scheme.
+
+static void mangleFunctionBlock(MangleContext &Context,
+ StringRef Outer,
+ const BlockDecl *BD,
+ raw_ostream &Out) {
+ unsigned discriminator = Context.getBlockId(BD, true);
+ if (discriminator == 0)
+ Out << "__" << Outer << "_block_invoke";
+ else
+ Out << "__" << Outer << "_block_invoke_" << discriminator+1;
+}
+
+void MangleContext::anchor() { }
+
+enum CCMangling {
+ CCM_Other,
+ CCM_Fast,
+ CCM_Vector,
+ CCM_Std
+};
+
+static bool isExternC(const NamedDecl *ND) {
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
+ return FD->isExternC();
+ return cast<VarDecl>(ND)->isExternC();
+}
+
+static CCMangling getCallingConvMangling(const ASTContext &Context,
+ const NamedDecl *ND) {
+ const TargetInfo &TI = Context.getTargetInfo();
+ const llvm::Triple &Triple = TI.getTriple();
+ if (!Triple.isOSWindows() ||
+ !(Triple.getArch() == llvm::Triple::x86 ||
+ Triple.getArch() == llvm::Triple::x86_64))
+ return CCM_Other;
+
+ if (Context.getLangOpts().CPlusPlus && !isExternC(ND) &&
+ TI.getCXXABI() == TargetCXXABI::Microsoft)
+ return CCM_Other;
+
+ const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
+ if (!FD)
+ return CCM_Other;
+ QualType T = FD->getType();
+
+ const FunctionType *FT = T->castAs<FunctionType>();
+
+ CallingConv CC = FT->getCallConv();
+ switch (CC) {
+ default:
+ return CCM_Other;
+ case CC_X86FastCall:
+ return CCM_Fast;
+ case CC_X86StdCall:
+ return CCM_Std;
+ case CC_X86VectorCall:
+ return CCM_Vector;
+ }
+}
+
+bool MangleContext::shouldMangleDeclName(const NamedDecl *D) {
+ const ASTContext &ASTContext = getASTContext();
+
+ CCMangling CC = getCallingConvMangling(ASTContext, D);
+ if (CC != CCM_Other)
+ return true;
+
+ // In C, functions with no attributes never need to be mangled. Fastpath them.
+ if (!getASTContext().getLangOpts().CPlusPlus && !D->hasAttrs())
+ return false;
+
+ // Any decl can be declared with __asm("foo") on it, and this takes precedence
+ // over all other naming in the .o file.
+ if (D->hasAttr<AsmLabelAttr>())
+ return true;
+
+ return shouldMangleCXXName(D);
+}
+
+void MangleContext::mangleName(const NamedDecl *D, raw_ostream &Out) {
+ // Any decl can be declared with __asm("foo") on it, and this takes precedence
+ // over all other naming in the .o file.
+ if (const AsmLabelAttr *ALA = D->getAttr<AsmLabelAttr>()) {
+ // If we have an asm name, then we use it as the mangling.
+
+ // Adding the prefix can cause problems when one file has a "foo" and
+ // another has a "\01foo". That is known to happen on ELF with the
+ // tricks normally used for producing aliases (PR9177). Fortunately the
+ // llvm mangler on ELF is a nop, so we can just avoid adding the \01
+ // marker. We also avoid adding the marker if this is an alias for an
+ // LLVM intrinsic.
+ StringRef UserLabelPrefix =
+ getASTContext().getTargetInfo().getUserLabelPrefix();
+ if (!UserLabelPrefix.empty() && !ALA->getLabel().startswith("llvm."))
+ Out << '\01'; // LLVM IR Marker for __asm("foo")
+
+ Out << ALA->getLabel();
+ return;
+ }
+
+ const ASTContext &ASTContext = getASTContext();
+ CCMangling CC = getCallingConvMangling(ASTContext, D);
+ bool MCXX = shouldMangleCXXName(D);
+ const TargetInfo &TI = Context.getTargetInfo();
+ if (CC == CCM_Other || (MCXX && TI.getCXXABI() == TargetCXXABI::Microsoft)) {
+ if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))
+ mangleObjCMethodName(OMD, Out);
+ else
+ mangleCXXName(D, Out);
+ return;
+ }
+
+ Out << '\01';
+ if (CC == CCM_Std)
+ Out << '_';
+ else if (CC == CCM_Fast)
+ Out << '@';
+
+ if (!MCXX)
+ Out << D->getIdentifier()->getName();
+ else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))
+ mangleObjCMethodName(OMD, Out);
+ else
+ mangleCXXName(D, Out);
+
+ const FunctionDecl *FD = cast<FunctionDecl>(D);
+ const FunctionType *FT = FD->getType()->castAs<FunctionType>();
+ const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT);
+ if (CC == CCM_Vector)
+ Out << '@';
+ Out << '@';
+ if (!Proto) {
+ Out << '0';
+ return;
+ }
+ assert(!Proto->isVariadic());
+ unsigned ArgWords = 0;
+ if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
+ if (!MD->isStatic())
+ ++ArgWords;
+ for (const auto &AT : Proto->param_types())
+ // Size should be aligned to pointer size.
+ ArgWords += llvm::RoundUpToAlignment(ASTContext.getTypeSize(AT),
+ TI.getPointerWidth(0)) /
+ TI.getPointerWidth(0);
+ Out << ((TI.getPointerWidth(0) / 8) * ArgWords);
+}
+
+void MangleContext::mangleGlobalBlock(const BlockDecl *BD,
+ const NamedDecl *ID,
+ raw_ostream &Out) {
+ unsigned discriminator = getBlockId(BD, false);
+ if (ID) {
+ if (shouldMangleDeclName(ID))
+ mangleName(ID, Out);
+ else {
+ Out << ID->getIdentifier()->getName();
+ }
+ }
+ if (discriminator == 0)
+ Out << "_block_invoke";
+ else
+ Out << "_block_invoke_" << discriminator+1;
+}
+
+void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD,
+ CXXCtorType CT, const BlockDecl *BD,
+ raw_ostream &ResStream) {
+ SmallString<64> Buffer;
+ llvm::raw_svector_ostream Out(Buffer);
+ mangleCXXCtor(CD, CT, Out);
+ mangleFunctionBlock(*this, Buffer, BD, ResStream);
+}
+
+void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD,
+ CXXDtorType DT, const BlockDecl *BD,
+ raw_ostream &ResStream) {
+ SmallString<64> Buffer;
+ llvm::raw_svector_ostream Out(Buffer);
+ mangleCXXDtor(DD, DT, Out);
+ mangleFunctionBlock(*this, Buffer, BD, ResStream);
+}
+
+void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD,
+ raw_ostream &Out) {
+ assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC));
+
+ SmallString<64> Buffer;
+ llvm::raw_svector_ostream Stream(Buffer);
+ if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) {
+ mangleObjCMethodName(Method, Stream);
+ } else {
+ assert((isa<NamedDecl>(DC) || isa<BlockDecl>(DC)) &&
+ "expected a NamedDecl or BlockDecl");
+ if (isa<BlockDecl>(DC))
+ for (; DC && isa<BlockDecl>(DC); DC = DC->getParent())
+ (void) getBlockId(cast<BlockDecl>(DC), true);
+ assert((isa<TranslationUnitDecl>(DC) || isa<NamedDecl>(DC)) &&
+ "expected a TranslationUnitDecl or a NamedDecl");
+ if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
+ mangleCtorBlock(CD, /*CT*/ Ctor_Complete, BD, Out);
+ else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
+ mangleDtorBlock(DD, /*DT*/ Dtor_Complete, BD, Out);
+ else if (auto ND = dyn_cast<NamedDecl>(DC)) {
+ if (!shouldMangleDeclName(ND) && ND->getIdentifier())
+ Stream << ND->getIdentifier()->getName();
+ else {
+ // FIXME: We were doing a mangleUnqualifiedName() before, but that's
+ // a private member of a class that will soon itself be private to the
+ // Itanium C++ ABI object. What should we do now? Right now, I'm just
+ // calling the mangleName() method on the MangleContext; is there a
+ // better way?
+ mangleName(ND, Stream);
+ }
+ }
+ }
+ mangleFunctionBlock(*this, Buffer, BD, Out);
+}
+
+void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
+ raw_ostream &Out) {
+ SmallString<64> Name;
+ llvm::raw_svector_ostream OS(Name);
+
+ const ObjCContainerDecl *CD =
+ dyn_cast<ObjCContainerDecl>(MD->getDeclContext());
+ assert (CD && "Missing container decl in GetNameForMethod");
+ OS << (MD->isInstanceMethod() ? '-' : '+') << '[' << CD->getName();
+ if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(CD))
+ OS << '(' << *CID << ')';
+ OS << ' ';
+ MD->getSelector().print(OS);
+ OS << ']';
+
+ Out << OS.str().size() << OS.str();
+}
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