582 lines
19 KiB
C++
582 lines
19 KiB
C++
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//===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/AST/VTableBuilder.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/IR/DataLayout.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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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 CCMangling {
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CCM_Other,
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CCM_Fast,
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CCM_RegCall,
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CCM_Vector,
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CCM_Std,
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CCM_WasmMainArgcArgv
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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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if (const VarDecl *VD = dyn_cast<VarDecl>(ND))
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return VD->isExternC();
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return false;
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}
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static CCMangling getCallingConvMangling(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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// On wasm, the argc/argv form of "main" is renamed so that the startup code
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// can call it with the correct function signature.
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// On Emscripten, users may be exporting "main" and expecting to call it
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// themselves, so we can't mangle it.
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if (Triple.isWasm() && !Triple.isOSEmscripten())
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if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
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if (FD->isMain() && FD->hasPrototype() && FD->param_size() == 2)
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return CCM_WasmMainArgcArgv;
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if (!Triple.isOSWindows() || !Triple.isX86())
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return CCM_Other;
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if (Context.getLangOpts().CPlusPlus && !isExternC(ND) &&
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TI.getCXXABI() == TargetCXXABI::Microsoft)
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return CCM_Other;
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const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
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if (!FD)
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return CCM_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 CCM_Other;
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case CC_X86FastCall:
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return CCM_Fast;
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case CC_X86StdCall:
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return CCM_Std;
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case CC_X86VectorCall:
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return CCM_Vector;
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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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CCMangling CC = getCallingConvMangling(ASTContext, D);
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if (CC != CCM_Other)
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return true;
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// If the declaration has an owning module for linkage purposes that needs to
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// be mangled, we must mangle its name.
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if (!D->hasExternalFormalLinkage() && D->getOwningModuleForLinkage())
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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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// Declarations that don't have identifier names always need to be mangled.
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if (isa<MSGuidDecl>(D))
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return true;
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return shouldMangleCXXName(D);
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}
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void MangleContext::mangleName(GlobalDecl GD, raw_ostream &Out) {
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const NamedDecl *D = cast<NamedDecl>(GD.getDecl());
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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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// If the label isn't literal, or if this is an alias for an LLVM intrinsic,
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// do not add a "\01" prefix.
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if (!ALA->getIsLiteralLabel() || ALA->getLabel().startswith("llvm.")) {
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Out << ALA->getLabel();
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return;
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}
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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.
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char GlobalPrefix =
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getASTContext().getTargetInfo().getDataLayout().getGlobalPrefix();
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if (GlobalPrefix)
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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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if (auto *GD = dyn_cast<MSGuidDecl>(D))
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return mangleMSGuidDecl(GD, Out);
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const ASTContext &ASTContext = getASTContext();
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CCMangling CC = getCallingConvMangling(ASTContext, D);
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if (CC == CCM_WasmMainArgcArgv) {
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Out << "__main_argc_argv";
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return;
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}
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bool MCXX = shouldMangleCXXName(D);
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const TargetInfo &TI = Context.getTargetInfo();
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if (CC == CCM_Other || (MCXX && TI.getCXXABI() == TargetCXXABI::Microsoft)) {
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if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))
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mangleObjCMethodNameAsSourceName(OMD, Out);
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else
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mangleCXXName(GD, Out);
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return;
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}
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Out << '\01';
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if (CC == CCM_Std)
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Out << '_';
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else if (CC == CCM_Fast)
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Out << '@';
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else if (CC == CCM_RegCall)
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Out << "__regcall3__";
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if (!MCXX)
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Out << D->getIdentifier()->getName();
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else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))
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mangleObjCMethodNameAsSourceName(OMD, Out);
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else
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mangleCXXName(GD, 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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if (CC == CCM_Vector)
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Out << '@';
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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 pointer size.
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ArgWords +=
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llvm::alignTo(ASTContext.getTypeSize(AT), TI.getPointerWidth(0)) /
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TI.getPointerWidth(0);
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Out << ((TI.getPointerWidth(0) / 8) * ArgWords);
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}
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void MangleContext::mangleMSGuidDecl(const MSGuidDecl *GD, raw_ostream &Out) {
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// For now, follow the MSVC naming convention for GUID objects on all
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// targets.
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MSGuidDecl::Parts P = GD->getParts();
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Out << llvm::format("_GUID_%08" PRIx32 "_%04" PRIx32 "_%04" PRIx32 "_",
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P.Part1, P.Part2, P.Part3);
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unsigned I = 0;
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for (uint8_t C : P.Part4And5) {
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Out << llvm::format("%02" PRIx8, C);
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if (++I == 2)
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Out << "_";
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}
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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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mangleName(GlobalDecl(CD, CT), Out);
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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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mangleName(GlobalDecl(DD, DT), Out);
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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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mangleObjCMethodNameAsSourceName(Method, Stream);
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} else {
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assert((isa<NamedDecl>(DC) || isa<BlockDecl>(DC)) &&
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"expected a NamedDecl or BlockDecl");
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if (isa<BlockDecl>(DC))
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for (; DC && isa<BlockDecl>(DC); DC = DC->getParent())
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(void) getBlockId(cast<BlockDecl>(DC), true);
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assert((isa<TranslationUnitDecl>(DC) || isa<NamedDecl>(DC)) &&
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"expected a TranslationUnitDecl or a NamedDecl");
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if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
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mangleCtorBlock(CD, /*CT*/ Ctor_Complete, BD, Out);
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else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
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mangleDtorBlock(DD, /*DT*/ Dtor_Complete, BD, Out);
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else if (auto ND = dyn_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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}
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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 &OS,
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bool includePrefixByte,
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bool includeCategoryNamespace) {
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if (getASTContext().getLangOpts().ObjCRuntime.isGNUFamily()) {
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// This is the mangling we've always used on the GNU runtimes, but it
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// has obvious collisions in the face of underscores within class
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// names, category names, and selectors; maybe we should improve it.
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OS << (MD->isClassMethod() ? "_c_" : "_i_")
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<< MD->getClassInterface()->getName() << '_';
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if (includeCategoryNamespace) {
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if (auto category = MD->getCategory())
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OS << category->getName();
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}
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OS << '_';
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auto selector = MD->getSelector();
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for (unsigned slotIndex = 0,
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numArgs = selector.getNumArgs(),
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slotEnd = std::max(numArgs, 1U);
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slotIndex != slotEnd; ++slotIndex) {
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if (auto name = selector.getIdentifierInfoForSlot(slotIndex))
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OS << name->getName();
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// Replace all the positions that would've been ':' with '_'.
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// That's after each slot except that a unary selector doesn't
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// end in ':'.
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if (numArgs)
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OS << '_';
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}
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return;
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}
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// \01+[ContainerName(CategoryName) SelectorName]
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if (includePrefixByte) {
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OS << '\01';
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}
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OS << (MD->isInstanceMethod() ? '-' : '+') << '[';
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if (const auto *CID = MD->getCategory()) {
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OS << CID->getClassInterface()->getName();
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if (includeCategoryNamespace) {
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OS << '(' << *CID << ')';
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}
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} else if (const auto *CD =
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dyn_cast<ObjCContainerDecl>(MD->getDeclContext())) {
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OS << CD->getName();
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} else {
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llvm_unreachable("Unexpected ObjC method decl context");
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}
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OS << ' ';
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MD->getSelector().print(OS);
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OS << ']';
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}
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void MangleContext::mangleObjCMethodNameAsSourceName(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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mangleObjCMethodName(MD, OS, /*includePrefixByte=*/false,
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/*includeCategoryNamespace=*/true);
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Out << OS.str().size() << OS.str();
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}
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class ASTNameGenerator::Implementation {
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std::unique_ptr<MangleContext> MC;
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llvm::DataLayout DL;
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public:
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explicit Implementation(ASTContext &Ctx)
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: MC(Ctx.createMangleContext()), DL(Ctx.getTargetInfo().getDataLayout()) {
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}
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bool writeName(const Decl *D, raw_ostream &OS) {
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// First apply frontend mangling.
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SmallString<128> FrontendBuf;
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llvm::raw_svector_ostream FrontendBufOS(FrontendBuf);
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if (auto *FD = dyn_cast<FunctionDecl>(D)) {
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if (FD->isDependentContext())
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return true;
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if (writeFuncOrVarName(FD, FrontendBufOS))
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return true;
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} else if (auto *VD = dyn_cast<VarDecl>(D)) {
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if (writeFuncOrVarName(VD, FrontendBufOS))
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return true;
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} else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
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MC->mangleObjCMethodName(MD, OS, /*includePrefixByte=*/false,
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/*includeCategoryNamespace=*/true);
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return false;
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} else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
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writeObjCClassName(ID, FrontendBufOS);
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} else {
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return true;
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}
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||
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// Now apply backend mangling.
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llvm::Mangler::getNameWithPrefix(OS, FrontendBufOS.str(), DL);
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return false;
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}
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||
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std::string getName(const Decl *D) {
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||
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std::string Name;
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||
|
{
|
||
|
llvm::raw_string_ostream OS(Name);
|
||
|
writeName(D, OS);
|
||
|
}
|
||
|
return Name;
|
||
|
}
|
||
|
|
||
|
enum ObjCKind {
|
||
|
ObjCClass,
|
||
|
ObjCMetaclass,
|
||
|
};
|
||
|
|
||
|
static StringRef getClassSymbolPrefix(ObjCKind Kind,
|
||
|
const ASTContext &Context) {
|
||
|
if (Context.getLangOpts().ObjCRuntime.isGNUFamily())
|
||
|
return Kind == ObjCMetaclass ? "_OBJC_METACLASS_" : "_OBJC_CLASS_";
|
||
|
return Kind == ObjCMetaclass ? "OBJC_METACLASS_$_" : "OBJC_CLASS_$_";
|
||
|
}
|
||
|
|
||
|
std::vector<std::string> getAllManglings(const ObjCContainerDecl *OCD) {
|
||
|
StringRef ClassName;
|
||
|
if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
|
||
|
ClassName = OID->getObjCRuntimeNameAsString();
|
||
|
else if (const auto *OID = dyn_cast<ObjCImplementationDecl>(OCD))
|
||
|
ClassName = OID->getObjCRuntimeNameAsString();
|
||
|
|
||
|
if (ClassName.empty())
|
||
|
return {};
|
||
|
|
||
|
auto Mangle = [&](ObjCKind Kind, StringRef ClassName) -> std::string {
|
||
|
SmallString<40> Mangled;
|
||
|
auto Prefix = getClassSymbolPrefix(Kind, OCD->getASTContext());
|
||
|
llvm::Mangler::getNameWithPrefix(Mangled, Prefix + ClassName, DL);
|
||
|
return std::string(Mangled.str());
|
||
|
};
|
||
|
|
||
|
return {
|
||
|
Mangle(ObjCClass, ClassName),
|
||
|
Mangle(ObjCMetaclass, ClassName),
|
||
|
};
|
||
|
}
|
||
|
|
||
|
std::vector<std::string> getAllManglings(const Decl *D) {
|
||
|
if (const auto *OCD = dyn_cast<ObjCContainerDecl>(D))
|
||
|
return getAllManglings(OCD);
|
||
|
|
||
|
if (!(isa<CXXRecordDecl>(D) || isa<CXXMethodDecl>(D)))
|
||
|
return {};
|
||
|
|
||
|
const NamedDecl *ND = cast<NamedDecl>(D);
|
||
|
|
||
|
ASTContext &Ctx = ND->getASTContext();
|
||
|
std::unique_ptr<MangleContext> M(Ctx.createMangleContext());
|
||
|
|
||
|
std::vector<std::string> Manglings;
|
||
|
|
||
|
auto hasDefaultCXXMethodCC = [](ASTContext &C, const CXXMethodDecl *MD) {
|
||
|
auto DefaultCC = C.getDefaultCallingConvention(/*IsVariadic=*/false,
|
||
|
/*IsCXXMethod=*/true);
|
||
|
auto CC = MD->getType()->castAs<FunctionProtoType>()->getCallConv();
|
||
|
return CC == DefaultCC;
|
||
|
};
|
||
|
|
||
|
if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND)) {
|
||
|
Manglings.emplace_back(getMangledStructor(CD, Ctor_Base));
|
||
|
|
||
|
if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily())
|
||
|
if (!CD->getParent()->isAbstract())
|
||
|
Manglings.emplace_back(getMangledStructor(CD, Ctor_Complete));
|
||
|
|
||
|
if (Ctx.getTargetInfo().getCXXABI().isMicrosoft())
|
||
|
if (CD->hasAttr<DLLExportAttr>() && CD->isDefaultConstructor())
|
||
|
if (!(hasDefaultCXXMethodCC(Ctx, CD) && CD->getNumParams() == 0))
|
||
|
Manglings.emplace_back(getMangledStructor(CD, Ctor_DefaultClosure));
|
||
|
} else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND)) {
|
||
|
Manglings.emplace_back(getMangledStructor(DD, Dtor_Base));
|
||
|
if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily()) {
|
||
|
Manglings.emplace_back(getMangledStructor(DD, Dtor_Complete));
|
||
|
if (DD->isVirtual())
|
||
|
Manglings.emplace_back(getMangledStructor(DD, Dtor_Deleting));
|
||
|
}
|
||
|
} else if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(ND)) {
|
||
|
Manglings.emplace_back(getName(ND));
|
||
|
if (MD->isVirtual())
|
||
|
if (const auto *TIV = Ctx.getVTableContext()->getThunkInfo(MD))
|
||
|
for (const auto &T : *TIV)
|
||
|
Manglings.emplace_back(getMangledThunk(MD, T));
|
||
|
}
|
||
|
|
||
|
return Manglings;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
bool writeFuncOrVarName(const NamedDecl *D, raw_ostream &OS) {
|
||
|
if (MC->shouldMangleDeclName(D)) {
|
||
|
GlobalDecl GD;
|
||
|
if (const auto *CtorD = dyn_cast<CXXConstructorDecl>(D))
|
||
|
GD = GlobalDecl(CtorD, Ctor_Complete);
|
||
|
else if (const auto *DtorD = dyn_cast<CXXDestructorDecl>(D))
|
||
|
GD = GlobalDecl(DtorD, Dtor_Complete);
|
||
|
else if (D->hasAttr<CUDAGlobalAttr>())
|
||
|
GD = GlobalDecl(cast<FunctionDecl>(D));
|
||
|
else
|
||
|
GD = GlobalDecl(D);
|
||
|
MC->mangleName(GD, OS);
|
||
|
return false;
|
||
|
} else {
|
||
|
IdentifierInfo *II = D->getIdentifier();
|
||
|
if (!II)
|
||
|
return true;
|
||
|
OS << II->getName();
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void writeObjCClassName(const ObjCInterfaceDecl *D, raw_ostream &OS) {
|
||
|
OS << getClassSymbolPrefix(ObjCClass, D->getASTContext());
|
||
|
OS << D->getObjCRuntimeNameAsString();
|
||
|
}
|
||
|
|
||
|
std::string getMangledStructor(const NamedDecl *ND, unsigned StructorType) {
|
||
|
std::string FrontendBuf;
|
||
|
llvm::raw_string_ostream FOS(FrontendBuf);
|
||
|
|
||
|
GlobalDecl GD;
|
||
|
if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND))
|
||
|
GD = GlobalDecl(CD, static_cast<CXXCtorType>(StructorType));
|
||
|
else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND))
|
||
|
GD = GlobalDecl(DD, static_cast<CXXDtorType>(StructorType));
|
||
|
MC->mangleName(GD, FOS);
|
||
|
|
||
|
std::string BackendBuf;
|
||
|
llvm::raw_string_ostream BOS(BackendBuf);
|
||
|
|
||
|
llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
|
||
|
|
||
|
return BOS.str();
|
||
|
}
|
||
|
|
||
|
std::string getMangledThunk(const CXXMethodDecl *MD, const ThunkInfo &T) {
|
||
|
std::string FrontendBuf;
|
||
|
llvm::raw_string_ostream FOS(FrontendBuf);
|
||
|
|
||
|
MC->mangleThunk(MD, T, FOS);
|
||
|
|
||
|
std::string BackendBuf;
|
||
|
llvm::raw_string_ostream BOS(BackendBuf);
|
||
|
|
||
|
llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
|
||
|
|
||
|
return BOS.str();
|
||
|
}
|
||
|
};
|
||
|
|
||
|
ASTNameGenerator::ASTNameGenerator(ASTContext &Ctx)
|
||
|
: Impl(std::make_unique<Implementation>(Ctx)) {}
|
||
|
|
||
|
ASTNameGenerator::~ASTNameGenerator() {}
|
||
|
|
||
|
bool ASTNameGenerator::writeName(const Decl *D, raw_ostream &OS) {
|
||
|
return Impl->writeName(D, OS);
|
||
|
}
|
||
|
|
||
|
std::string ASTNameGenerator::getName(const Decl *D) {
|
||
|
return Impl->getName(D);
|
||
|
}
|
||
|
|
||
|
std::vector<std::string> ASTNameGenerator::getAllManglings(const Decl *D) {
|
||
|
return Impl->getAllManglings(D);
|
||
|
}
|