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mirror-llvm-project/clang/unittests/CodeGen/CodeGenExternalTest.cpp
Benjamin Luke 315c8bba65
Reland "[clang][CodeGen][X86_64] Honor per-function AVX ABI in C/C++ call paths, maintain old psABI for PlayStation." (#210349) 
https://github.com/llvm/llvm-project/pull/193298 was reverted because of
a compile time regression (see results
[here](https://llvm-compile-time-tracker.com/compare.php?from=b9869c8c920a7dfa983e215bc30729b13d8b353b&to=464b46a73b7592c95222cf2e64b34ffe6f2cf251&stat=instructions:u))

I added a conditional statement so that getFunctionFeatureMap and the
subsequent string lookup is only called if FD->hasAttr<TargetAttr>()
evaluates to true which should be very rare.

---------

Co-authored-by: Aaron Ballman <aaron@aaronballman.com>
2026-07-21 09:04:03 -07:00

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//===- unittests/CodeGen/CodeGenExternalTest.cpp - test external CodeGen -===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "TestCompiler.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/BaseSubobject.h"
#include "clang/AST/Decl.h"
#include "clang/AST/GlobalDecl.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CodeGen/CodeGenABITypes.h"
#include "clang/CodeGen/ModuleBuilder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/ParseAST.h"
#include "clang/Sema/Sema.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Operator.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/TargetParser/Host.h"
#include "llvm/TargetParser/Triple.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace clang;
namespace {
// Mocks up a language using Clang code generation as a library and
// tests some basic functionality there.
// - CodeGen->GetAddrOfGlobal
// - CodeGen::convertTypeForMemory
// - CodeGen::getLLVMFieldNumber
static const bool DebugThisTest = false;
// forward declarations
struct MyASTConsumer;
static void test_generic_codegen_fns(MyASTConsumer *my);
static void test_x86_avx_abi_codegen_fns(MyASTConsumer *my);
static bool test_generic_codegen_fns_ran;
static bool test_x86_avx_abi_codegen_fns_ran;
// This forwards the calls to the Clang CodeGenerator
// so that we can test CodeGen functions while it is open.
// It accumulates toplevel decls in HandleTopLevelDecl and
// calls test_codegen_fns() in HandleTranslationUnit
// before forwarding that function to the CodeGenerator.
struct MyASTConsumer : public ASTConsumer {
using TestFn = void (*)(MyASTConsumer *);
std::unique_ptr<CodeGenerator> Builder;
TestFn TestFunction;
std::vector<Decl*> toplevel_decls;
MyASTConsumer(std::unique_ptr<CodeGenerator> Builder_in, TestFn TestFunction)
: ASTConsumer(), Builder(std::move(Builder_in)),
TestFunction(TestFunction) {}
~MyASTConsumer() { }
void Initialize(ASTContext &Context) override;
void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) override;
bool HandleTopLevelDecl(DeclGroupRef D) override;
void HandleInlineFunctionDefinition(FunctionDecl *D) override;
void HandleInterestingDecl(DeclGroupRef D) override;
void HandleTranslationUnit(ASTContext &Ctx) override;
void HandleTagDeclDefinition(TagDecl *D) override;
void HandleTagDeclRequiredDefinition(const TagDecl *D) override;
void HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) override;
void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override;
void HandleImplicitImportDecl(ImportDecl *D) override;
void CompleteTentativeDefinition(VarDecl *D) override;
void AssignInheritanceModel(CXXRecordDecl *RD) override;
void HandleVTable(CXXRecordDecl *RD) override;
ASTMutationListener *GetASTMutationListener() override;
ASTDeserializationListener *GetASTDeserializationListener() override;
void PrintStats() override;
bool shouldSkipFunctionBody(Decl *D) override;
};
void MyASTConsumer::Initialize(ASTContext &Context) {
Builder->Initialize(Context);
}
bool MyASTConsumer::HandleTopLevelDecl(DeclGroupRef DG) {
for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) {
toplevel_decls.push_back(*I);
}
return Builder->HandleTopLevelDecl(DG);
}
void MyASTConsumer::HandleInlineFunctionDefinition(FunctionDecl *D) {
Builder->HandleInlineFunctionDefinition(D);
}
void MyASTConsumer::HandleInterestingDecl(DeclGroupRef D) {
Builder->HandleInterestingDecl(D);
}
void MyASTConsumer::HandleTranslationUnit(ASTContext &Context) {
TestFunction(this);
// HandleTranslationUnit can close the module
Builder->HandleTranslationUnit(Context);
}
void MyASTConsumer::HandleTagDeclDefinition(TagDecl *D) {
Builder->HandleTagDeclDefinition(D);
}
void MyASTConsumer::HandleTagDeclRequiredDefinition(const TagDecl *D) {
Builder->HandleTagDeclRequiredDefinition(D);
}
void MyASTConsumer::HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) {
Builder->HandleCXXImplicitFunctionInstantiation(D);
}
void MyASTConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef D) {
Builder->HandleTopLevelDeclInObjCContainer(D);
}
void MyASTConsumer::HandleImplicitImportDecl(ImportDecl *D) {
Builder->HandleImplicitImportDecl(D);
}
void MyASTConsumer::CompleteTentativeDefinition(VarDecl *D) {
Builder->CompleteTentativeDefinition(D);
}
void MyASTConsumer::AssignInheritanceModel(CXXRecordDecl *RD) {
Builder->AssignInheritanceModel(RD);
}
void MyASTConsumer::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
Builder->HandleCXXStaticMemberVarInstantiation(VD);
}
void MyASTConsumer::HandleVTable(CXXRecordDecl *RD) {
Builder->HandleVTable(RD);
}
ASTMutationListener *MyASTConsumer::GetASTMutationListener() {
return Builder->GetASTMutationListener();
}
ASTDeserializationListener *MyASTConsumer::GetASTDeserializationListener() {
return Builder->GetASTDeserializationListener();
}
void MyASTConsumer::PrintStats() {
Builder->PrintStats();
}
bool MyASTConsumer::shouldSkipFunctionBody(Decl *D) {
return Builder->shouldSkipFunctionBody(D);
}
const char GenericTestProgram[] =
"struct mytest_struct { char x; short y; char p; long z; };\n"
"int mytest_fn(int x) { return x; }\n"
"struct mytest_dynamic_struct {\n"
" mytest_dynamic_struct();\n"
" virtual void f1();\n"
"};\n"
"mytest_dynamic_struct::mytest_dynamic_struct() { }\n";
const char X86AVXABITestProgram[] =
"typedef float mytest_v8f __attribute__((vector_size(32)));\n"
"struct mytest_avx_method_holder {\n"
" __attribute__((target(\"avx\"))) mytest_v8f method(mytest_v8f x) {\n"
" return x;\n"
" }\n"
"};\n"
"__attribute__((target(\"avx\"))) mytest_v8f mytest_avx_fn(mytest_v8f x) "
"{\n"
" return x;\n"
"}\n"
"__attribute__((target(\"avx\"))) void caller() "
"{\n"
" mytest_v8f hello = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0};\n"
" mytest_avx_fn(hello);\n"
" mytest_avx_method_holder holder = mytest_avx_method_holder();\n"
" holder.method(hello);\n"
"}\n"
"__attribute__((target(\"avx\"))) void caller2() {}\n";
static void test_generic_codegen_fns(MyASTConsumer *my) {
bool mytest_fn_ok = false;
bool mytest_struct_ok = false;
CodeGen::CodeGenModule &CGM = my->Builder->CGM();
const ASTContext &Ctx = my->toplevel_decls.front()->getASTContext();
for (auto decl : my->toplevel_decls ) {
if (FunctionDecl *fd = dyn_cast<FunctionDecl>(decl)) {
if (fd->getDeclName().isIdentifier()) {
if (fd->getName() == "mytest_fn") {
Constant *c = my->Builder->GetAddrOfGlobal(GlobalDecl(fd), false);
// Verify that we got a function.
ASSERT_TRUE(c != NULL);
if (DebugThisTest) {
c->print(dbgs(), true);
dbgs() << "\n";
}
mytest_fn_ok = true;
}
}
} else if (CXXRecordDecl *rd = dyn_cast<CXXRecordDecl>(decl)) {
if (rd->getName() == "mytest_struct") {
RecordDecl *def = rd->getDefinition();
ASSERT_TRUE(def != NULL);
CanQualType qType = Ctx.getCanonicalTagType(rd);
// Check convertTypeForMemory
llvm::Type *llvmTy = CodeGen::convertTypeForMemory(CGM, qType);
ASSERT_TRUE(llvmTy != NULL);
if (DebugThisTest) {
llvmTy->print(dbgs(), true);
dbgs() << "\n";
}
auto* structTy = dyn_cast<llvm::StructType>(llvmTy);
ASSERT_TRUE(structTy != NULL);
// Check getLLVMFieldNumber
FieldDecl *xField = NULL;
FieldDecl *yField = NULL;
FieldDecl *zField = NULL;
for (auto field : rd->fields()) {
if (field->getName() == "x") xField = field;
if (field->getName() == "y") yField = field;
if (field->getName() == "z") zField = field;
}
ASSERT_TRUE(xField != NULL);
ASSERT_TRUE(yField != NULL);
ASSERT_TRUE(zField != NULL);
unsigned x = CodeGen::getLLVMFieldNumber(CGM, rd, xField);
unsigned y = CodeGen::getLLVMFieldNumber(CGM, rd, yField);
unsigned z = CodeGen::getLLVMFieldNumber(CGM, rd, zField);
ASSERT_NE(x, y);
ASSERT_NE(y, z);
llvm::Type* xTy = structTy->getTypeAtIndex(x);
llvm::Type* yTy = structTy->getTypeAtIndex(y);
llvm::Type* zTy = structTy->getTypeAtIndex(z);
ASSERT_TRUE(xTy != NULL);
ASSERT_TRUE(yTy != NULL);
ASSERT_TRUE(zTy != NULL);
if (DebugThisTest) {
xTy->print(dbgs(), true);
dbgs() << "\n";
yTy->print(dbgs(), true);
dbgs() << "\n";
zTy->print(dbgs(), true);
dbgs() << "\n";
}
ASSERT_GE(xTy->getPrimitiveSizeInBits(), 1u);
ASSERT_GE(yTy->getPrimitiveSizeInBits(), 16u); // short is at least 16b
ASSERT_GE(zTy->getPrimitiveSizeInBits(), 32u); // long is at least 32b
mytest_struct_ok = true;
} else if (rd->getName() == "mytest_dynamic_struct") {
Constant *c = my->Builder->GetAddrOfVTable(
BaseSubobject(rd, CharUnits::fromQuantity(0)), rd);
ASSERT_NE(c, nullptr);
Value *vtableGlobal = c->getOperand(0);
ASSERT_NE(vtableGlobal, nullptr);
ASSERT_EQ(vtableGlobal->getName(), "_ZTV21mytest_dynamic_struct");
const DataLayout &dataLayout =
my->Builder->GetModule()->getDataLayout();
unsigned pointerSizeInBits =
dataLayout.getPointerTypeSizeInBits(c->getType());
APInt offset(pointerSizeInBits, 0);
GEPOperator *gepOperator = dyn_cast<GEPOperator>(c);
ASSERT_NE(gepOperator, nullptr);
gepOperator->accumulateConstantOffset(dataLayout, offset);
// Itanium ABI has a couple of pointers (offset to top, type info)
// before the array of function pointers.
ASSERT_EQ(offset, (pointerSizeInBits / 8) * 2);
}
}
}
ASSERT_TRUE(mytest_fn_ok);
ASSERT_TRUE(mytest_struct_ok);
test_generic_codegen_fns_ran = true;
}
static void test_x86_avx_abi_codegen_fns(MyASTConsumer *my) {
bool mytest_avx_fn_ok = false;
bool mytest_avx_method_ok = false;
CodeGen::CodeGenModule &CGM = my->Builder->CGM();
const ASTContext &Ctx = my->toplevel_decls.front()->getASTContext();
// First get the caller decls, which we need to determine call ABI.
FunctionDecl *callerDecl = nullptr;
FunctionDecl *caller2Decl = nullptr;
for (auto decl : my->toplevel_decls) {
if (FunctionDecl *fd = dyn_cast<FunctionDecl>(decl)) {
if (fd->getName() == "caller")
callerDecl = fd;
else if (fd->getName() == "caller2")
caller2Decl = fd;
}
}
ASSERT_TRUE(callerDecl);
ASSERT_TRUE(caller2Decl);
ASSERT_NE(callerDecl, caller2Decl);
for (auto decl : my->toplevel_decls) {
if (FunctionDecl *fd = dyn_cast<FunctionDecl>(decl)) {
if (fd->getName() != "mytest_avx_fn")
continue;
const auto *FPT = fd->getType()->castAs<FunctionProtoType>();
SmallVector<CanQualType, 4> ArgTypes;
for (const ParmVarDecl *Param : fd->parameters())
ArgTypes.push_back(Ctx.getCanonicalParamType(Param->getType()));
const CodeGen::CGFunctionInfo &FnInfo = CodeGen::arrangeFreeFunctionCall(
CGM, Ctx.getCanonicalType(FPT->getReturnType()), ArgTypes,
FPT->getExtInfo(), {},
CodeGen::RequiredArgs::forPrototypePlus(FPT, 0), callerDecl);
const CodeGen::CGFunctionInfo &FnInfo2 = CodeGen::arrangeFreeFunctionCall(
CGM, Ctx.getCanonicalType(FPT->getReturnType()), ArgTypes,
FPT->getExtInfo(), {},
CodeGen::RequiredArgs::forPrototypePlus(FPT, 0), caller2Decl);
ASSERT_EQ(&FnInfo, &FnInfo2);
ASSERT_EQ(FnInfo.getX86ABIAVXLevel(), 1u);
ASSERT_TRUE(FnInfo.getReturnInfo().isDirect());
ASSERT_TRUE(FnInfo.arg_begin()->info.isDirect());
mytest_avx_fn_ok = true;
} else if (RecordDecl *rd = dyn_cast<RecordDecl>(decl)) {
if (rd->getName() != "mytest_avx_method_holder")
continue;
const auto *MethodRD = cast<CXXRecordDecl>(rd->getDefinition());
const auto *MD = cast<CXXMethodDecl>(*MethodRD->method_begin());
const auto *FPT = MD->getType()->castAs<FunctionProtoType>();
SmallVector<CanQualType, 4> ArgTypes;
ArgTypes.push_back(Ctx.getCanonicalParamType(MD->getThisType()));
for (const ParmVarDecl *Param : MD->parameters())
ArgTypes.push_back(Ctx.getCanonicalParamType(Param->getType()));
const CodeGen::CGFunctionInfo &FnInfo = CodeGen::arrangeCXXMethodCall(
CGM, Ctx.getCanonicalType(FPT->getReturnType()), ArgTypes,
FPT->getExtInfo(), {},
CodeGen::RequiredArgs::forPrototypePlus(FPT, 1), callerDecl);
ASSERT_EQ(FnInfo.getX86ABIAVXLevel(), 1u);
ASSERT_TRUE(FnInfo.getReturnInfo().isDirect());
ASSERT_TRUE(FnInfo.arg_begin()[1].info.isDirect());
mytest_avx_method_ok = true;
}
}
ASSERT_TRUE(mytest_avx_fn_ok);
ASSERT_TRUE(mytest_avx_method_ok);
test_x86_avx_abi_codegen_fns_ran = true;
}
TEST(CodeGenExternalTest, CodeGenExternalTest) {
clang::LangOptions LO;
LO.CPlusPlus = 1;
LO.CPlusPlus11 = 1;
TestCompiler Compiler(LO);
auto CustomASTConsumer = std::make_unique<MyASTConsumer>(
std::move(Compiler.CG), test_generic_codegen_fns);
Compiler.init(GenericTestProgram, std::move(CustomASTConsumer));
clang::ParseAST(Compiler.compiler.getSema(), false, false);
ASSERT_TRUE(test_generic_codegen_fns_ran);
}
TEST(CodeGenExternalTest, X86AVXABIQuery) {
clang::LangOptions LO;
LO.CPlusPlus = 1;
LO.CPlusPlus11 = 1;
TestCompiler Compiler(LO, clang::CodeGenOptions(),
"x86_64-unknown-linux-gnu");
auto CustomASTConsumer = std::make_unique<MyASTConsumer>(
std::move(Compiler.CG), test_x86_avx_abi_codegen_fns);
Compiler.init(X86AVXABITestProgram, std::move(CustomASTConsumer));
clang::ParseAST(Compiler.compiler.getSema(), false, false);
ASSERT_TRUE(test_x86_avx_abi_codegen_fns_ran);
}
} // end anonymous namespace
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