[AIX][Frontend] C++ ABI customizations for AIX boilerplate
This PR enables "XL" C++ ABI in frontend AST to IR codegen. And it is driven by
static init work. The current kind in Clang by default is Generic Itanium, which
has different behavior on static init with IBM xlclang compiler on AIX.
Differential Revision: https://reviews.llvm.org/D74015
diff --git a/clang/include/clang/Basic/TargetCXXABI.h b/clang/include/clang/Basic/TargetCXXABI.h
index 1ab45d2..93f70fc 100644
--- a/clang/include/clang/Basic/TargetCXXABI.h
+++ b/clang/include/clang/Basic/TargetCXXABI.h
@@ -109,6 +109,13 @@
/// - constructors and destructors return 'this', as in ARM.
Fuchsia,
+ /// The XL ABI is the ABI used by IBM xlclang compiler and is a modified
+ /// version of the Itanium ABI.
+ ///
+ /// The relevant changes from the Itanium ABI are:
+ /// - static initialization is adjusted to use sinit and sterm functions;
+ XL,
+
/// The Microsoft ABI is the ABI used by Microsoft Visual Studio (and
/// compatible compilers).
///
@@ -148,6 +155,7 @@
case WatchOS:
case GenericMIPS:
case WebAssembly:
+ case XL:
return true;
case Microsoft:
@@ -168,6 +176,7 @@
case WatchOS:
case GenericMIPS:
case WebAssembly:
+ case XL:
return false;
case Microsoft:
@@ -202,6 +211,7 @@
case iOS64:
case WatchOS:
case Microsoft:
+ case XL:
return true;
}
llvm_unreachable("bad ABI kind");
@@ -278,6 +288,7 @@
case iOS: // old iOS compilers did not follow this rule
case Microsoft:
case GenericMIPS:
+ case XL:
return true;
}
llvm_unreachable("bad ABI kind");
@@ -315,6 +326,7 @@
case GenericARM:
case iOS:
case GenericMIPS:
+ case XL:
return UseTailPaddingUnlessPOD03;
// iOS on ARM64 and WebAssembly use the C++11 POD rules. They do not honor
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 50a0c3d..b4527dc 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -874,6 +874,7 @@
case TargetCXXABI::GenericMIPS:
case TargetCXXABI::GenericItanium:
case TargetCXXABI::WebAssembly:
+ case TargetCXXABI::XL:
return CreateItaniumCXXABI(*this);
case TargetCXXABI::Microsoft:
return CreateMicrosoftCXXABI(*this);
@@ -10253,6 +10254,7 @@
case TargetCXXABI::iOS64:
case TargetCXXABI::WebAssembly:
case TargetCXXABI::WatchOS:
+ case TargetCXXABI::XL:
return ItaniumMangleContext::create(*this, getDiagnostics());
case TargetCXXABI::Microsoft:
return MicrosoftMangleContext::create(*this, getDiagnostics());
diff --git a/clang/lib/Basic/Targets/OSTargets.h b/clang/lib/Basic/Targets/OSTargets.h
index 70fac03..e57ad7b 100644
--- a/clang/lib/Basic/Targets/OSTargets.h
+++ b/clang/lib/Basic/Targets/OSTargets.h
@@ -706,6 +706,8 @@
public:
AIXTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
: OSTargetInfo<Target>(Triple, Opts) {
+ this->TheCXXABI.set(TargetCXXABI::XL);
+
if (this->PointerWidth == 64) {
this->WCharType = this->UnsignedInt;
} else {
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 235a405..d4ed486 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -83,6 +83,7 @@
case TargetCXXABI::GenericMIPS:
case TargetCXXABI::GenericItanium:
case TargetCXXABI::WebAssembly:
+ case TargetCXXABI::XL:
return CreateItaniumCXXABI(CGM);
case TargetCXXABI::Microsoft:
return CreateMicrosoftCXXABI(CGM);
diff --git a/clang/lib/CodeGen/ItaniumCXXABI.cpp b/clang/lib/CodeGen/ItaniumCXXABI.cpp
index 057c726..c8a73c2 100644
--- a/clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ b/clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -516,6 +516,16 @@
}
bool canCallMismatchedFunctionType() const override { return false; }
};
+
+class XLCXXABI final : public ItaniumCXXABI {
+public:
+ explicit XLCXXABI(CodeGen::CodeGenModule &CGM)
+ : ItaniumCXXABI(CGM) {}
+
+ void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
+ llvm::FunctionCallee dtor,
+ llvm::Constant *addr) override;
+};
}
CodeGen::CGCXXABI *CodeGen::CreateItaniumCXXABI(CodeGenModule &CGM) {
@@ -546,6 +556,9 @@
case TargetCXXABI::WebAssembly:
return new WebAssemblyCXXABI(CGM);
+ case TargetCXXABI::XL:
+ return new XLCXXABI(CGM);
+
case TargetCXXABI::GenericItanium:
if (CGM.getContext().getTargetInfo().getTriple().getArch()
== llvm::Triple::le32) {
@@ -4407,3 +4420,11 @@
NormalCleanup, cast<llvm::CatchPadInst>(CGF.CurrentFuncletPad));
ItaniumCXXABI::emitBeginCatch(CGF, C);
}
+
+/// Register a global destructor as best as we know how.
+void XLCXXABI::registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
+ llvm::FunctionCallee dtor,
+ llvm::Constant *addr) {
+ llvm::report_fatal_error("Static initialization has not been implemented on"
+ " XL ABI yet.");
+}
diff --git a/clang/test/CodeGen/static-init.cpp b/clang/test/CodeGen/static-init.cpp
new file mode 100644
index 0000000..b9437ec
--- /dev/null
+++ b/clang/test/CodeGen/static-init.cpp
@@ -0,0 +1,12 @@
+// RUN: not %clang_cc1 -triple powerpc-ibm-aix-xcoff -S -emit-llvm -x c++ %s \
+// RUN: 2>&1 | FileCheck %s
+
+// RUN: not %clang_cc1 -triple powerpc64-ibm-aix-xcoff -S -emit-llvm -x c++ %s \
+// RUN: 2>&1 | FileCheck %s
+
+struct test {
+ test();
+ ~test();
+} t;
+
+// CHECK: error in backend: Static initialization has not been implemented on XL ABI yet.
