251 lines
8.0 KiB
C++
251 lines
8.0 KiB
C++
//===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implements generic name mangling support for blocks and Objective-C.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/Attr.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/Mangle.h"
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#include "clang/Basic/ABI.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/TargetInfo.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#define MANGLE_CHECKER 0
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#if MANGLE_CHECKER
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#include <cxxabi.h>
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#endif
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using namespace clang;
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// FIXME: For blocks we currently mimic GCC's mangling scheme, which leaves
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// much to be desired. Come up with a better mangling scheme.
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static void mangleFunctionBlock(MangleContext &Context,
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StringRef Outer,
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const BlockDecl *BD,
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raw_ostream &Out) {
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unsigned discriminator = Context.getBlockId(BD, true);
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if (discriminator == 0)
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Out << "__" << Outer << "_block_invoke";
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else
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Out << "__" << Outer << "_block_invoke_" << discriminator+1;
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}
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void MangleContext::anchor() { }
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enum StdOrFastCC {
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SOF_OTHER,
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SOF_FAST,
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SOF_STD
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};
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static bool isExternC(const NamedDecl *ND) {
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if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
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return FD->isExternC();
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return cast<VarDecl>(ND)->isExternC();
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}
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static StdOrFastCC getStdOrFastCallMangling(const ASTContext &Context,
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const NamedDecl *ND) {
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const TargetInfo &TI = Context.getTargetInfo();
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const llvm::Triple &Triple = TI.getTriple();
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if (!Triple.isOSWindows() || Triple.getArch() != llvm::Triple::x86)
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return SOF_OTHER;
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if (Context.getLangOpts().CPlusPlus && !isExternC(ND) &&
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TI.getCXXABI() == TargetCXXABI::Microsoft)
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return SOF_OTHER;
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const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
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if (!FD)
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return SOF_OTHER;
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QualType T = FD->getType();
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const FunctionType *FT = T->castAs<FunctionType>();
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CallingConv CC = FT->getCallConv();
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switch (CC) {
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default:
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return SOF_OTHER;
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case CC_X86FastCall:
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return SOF_FAST;
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case CC_X86StdCall:
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return SOF_STD;
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}
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}
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bool MangleContext::shouldMangleDeclName(const NamedDecl *D) {
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const ASTContext &ASTContext = getASTContext();
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StdOrFastCC CC = getStdOrFastCallMangling(ASTContext, D);
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if (CC != SOF_OTHER)
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return true;
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// In C, functions with no attributes never need to be mangled. Fastpath them.
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if (!getASTContext().getLangOpts().CPlusPlus && !D->hasAttrs())
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return false;
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// Any decl can be declared with __asm("foo") on it, and this takes precedence
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// over all other naming in the .o file.
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if (D->hasAttr<AsmLabelAttr>())
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return true;
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return shouldMangleCXXName(D);
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}
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void MangleContext::mangleName(const NamedDecl *D, raw_ostream &Out) {
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// Any decl can be declared with __asm("foo") on it, and this takes precedence
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// over all other naming in the .o file.
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if (const AsmLabelAttr *ALA = D->getAttr<AsmLabelAttr>()) {
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// If we have an asm name, then we use it as the mangling.
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// Adding the prefix can cause problems when one file has a "foo" and
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// another has a "\01foo". That is known to happen on ELF with the
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// tricks normally used for producing aliases (PR9177). Fortunately the
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// llvm mangler on ELF is a nop, so we can just avoid adding the \01
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// marker. We also avoid adding the marker if this is an alias for an
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// LLVM intrinsic.
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StringRef UserLabelPrefix =
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getASTContext().getTargetInfo().getUserLabelPrefix();
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if (!UserLabelPrefix.empty() && !ALA->getLabel().startswith("llvm."))
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Out << '\01'; // LLVM IR Marker for __asm("foo")
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Out << ALA->getLabel();
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return;
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}
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const ASTContext &ASTContext = getASTContext();
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StdOrFastCC CC = getStdOrFastCallMangling(ASTContext, D);
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bool MCXX = shouldMangleCXXName(D);
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const TargetInfo &TI = Context.getTargetInfo();
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if (CC == SOF_OTHER || (MCXX && TI.getCXXABI() == TargetCXXABI::Microsoft)) {
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mangleCXXName(D, Out);
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return;
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}
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Out << '\01';
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if (CC == SOF_STD)
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Out << '_';
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else
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Out << '@';
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if (!MCXX)
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Out << D->getIdentifier()->getName();
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else
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mangleCXXName(D, Out);
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const FunctionDecl *FD = cast<FunctionDecl>(D);
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const FunctionType *FT = FD->getType()->castAs<FunctionType>();
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const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT);
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Out << '@';
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if (!Proto) {
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Out << '0';
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return;
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}
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assert(!Proto->isVariadic());
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unsigned ArgWords = 0;
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if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
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if (!MD->isStatic())
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++ArgWords;
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for (const auto &AT : Proto->param_types())
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// Size should be aligned to DWORD boundary
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ArgWords += llvm::RoundUpToAlignment(ASTContext.getTypeSize(AT), 32) / 32;
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Out << 4 * ArgWords;
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}
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void MangleContext::mangleGlobalBlock(const BlockDecl *BD,
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const NamedDecl *ID,
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raw_ostream &Out) {
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unsigned discriminator = getBlockId(BD, false);
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if (ID) {
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if (shouldMangleDeclName(ID))
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mangleName(ID, Out);
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else {
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Out << ID->getIdentifier()->getName();
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}
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}
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if (discriminator == 0)
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Out << "_block_invoke";
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else
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Out << "_block_invoke_" << discriminator+1;
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}
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void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD,
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CXXCtorType CT, const BlockDecl *BD,
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raw_ostream &ResStream) {
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SmallString<64> Buffer;
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llvm::raw_svector_ostream Out(Buffer);
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mangleCXXCtor(CD, CT, Out);
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Out.flush();
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mangleFunctionBlock(*this, Buffer, BD, ResStream);
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}
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void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD,
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CXXDtorType DT, const BlockDecl *BD,
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raw_ostream &ResStream) {
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SmallString<64> Buffer;
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llvm::raw_svector_ostream Out(Buffer);
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mangleCXXDtor(DD, DT, Out);
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Out.flush();
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mangleFunctionBlock(*this, Buffer, BD, ResStream);
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}
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void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD,
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raw_ostream &Out) {
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assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC));
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SmallString<64> Buffer;
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llvm::raw_svector_ostream Stream(Buffer);
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if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) {
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mangleObjCMethodName(Method, Stream);
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} else {
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const NamedDecl *ND = cast<NamedDecl>(DC);
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if (!shouldMangleDeclName(ND) && ND->getIdentifier())
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Stream << ND->getIdentifier()->getName();
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else {
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// FIXME: We were doing a mangleUnqualifiedName() before, but that's
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// a private member of a class that will soon itself be private to the
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// Itanium C++ ABI object. What should we do now? Right now, I'm just
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// calling the mangleName() method on the MangleContext; is there a
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// better way?
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mangleName(ND, Stream);
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}
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}
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Stream.flush();
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mangleFunctionBlock(*this, Buffer, BD, Out);
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}
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void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
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raw_ostream &Out) {
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SmallString<64> Name;
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llvm::raw_svector_ostream OS(Name);
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const ObjCContainerDecl *CD =
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dyn_cast<ObjCContainerDecl>(MD->getDeclContext());
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assert (CD && "Missing container decl in GetNameForMethod");
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OS << (MD->isInstanceMethod() ? '-' : '+') << '[' << CD->getName();
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if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(CD))
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OS << '(' << *CID << ')';
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OS << ' ';
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MD->getSelector().print(OS);
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OS << ']';
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Out << OS.str().size() << OS.str();
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}
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