GCC Code Coverage Report

Directory: ../
File: src/irgenerator/GenVTable.cpp
Date: 2025-10-09 06:28:01
Coverage Exec Excl Total
Lines: 100.0% 93 0 93
Functions: 100.0% 4 0 4
Branches: 54.1% 92 0 170
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1 // Copyright (c) 2021-2025 ChilliBits. All rights reserved.
2
3 #include "IRGenerator.h"
4
5 #include <llvm/IR/Module.h>
6
7 #include <SourceFile.h>
8 #include <driver/Driver.h>
9 #include <irgenerator/NameMangling.h>
10
11 namespace spice::compiler {
12
13 355 llvm::Constant *IRGenerator::generateTypeInfoName(StructBase *spiceStruct) const {
14 // Resolve mangled type info name and mangled global name
15
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 355 const std::string globalName = NameMangling::mangleTypeInfoName(spiceStruct);
16
17 // Generate global string constant
18 llvm::GlobalVariable *global =
19
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 355 builder.CreateGlobalString(NameMangling::mangleTypeInfoValue(spiceStruct->name), globalName, 0, module);
20
21 // If the output should be comparable, fix alignment to 4 bytes
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 355 if (cliOptions.comparableOutput)
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 355 global->setAlignment(llvm::Align(4));
24
25 // Set global attributes
26 355 global->setConstant(true);
27 355 global->setDSOLocal(true);
28 355 global->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::None);
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 355 global->setLinkage(llvm::GlobalValue::ExternalLinkage);
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 355 global->setComdat(module->getOrInsertComdat(globalName));
31
32 355 return spiceStruct->vTableData.typeInfoName = global;
33 355 }
34
35 355 llvm::Constant *IRGenerator::generateTypeInfo(StructBase *spiceStruct) const {
36 // Generate type info name
37
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 355 llvm::Constant *typeInfoName = generateTypeInfoName(spiceStruct);
38
39 // Generate LLVM type for type info
40
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 355 const std::string mangledName = NameMangling::mangleTypeInfo(spiceStruct);
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 355 llvm::PointerType *ptrTy = builder.getPtrTy();
42
43 355 QualTypeList interfaceTypes;
44
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 355 if (spiceStruct->entry->getQualType().is(TY_STRUCT)) {
45 193 const auto spiceStructEnsured = reinterpret_cast<Struct *>(spiceStruct);
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 193 interfaceTypes = spiceStructEnsured->interfaceTypes;
47 }
48
49 // Build type info LLVM type
50
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 710 std::vector<llvm::Type *> typeInfoFieldTypes = {ptrTy, ptrTy};
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 505 for (size_t i = 0; i < interfaceTypes.size(); i++)
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 150 typeInfoFieldTypes.push_back(ptrTy);
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 355 spiceStruct->vTableData.typeInfoType = llvm::StructType::get(context, typeInfoFieldTypes);
54
55 // Generate type info values
56
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 355 llvm::Constant *typeInfoVTable = llvm::Constant::getNullValue(ptrTy);
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 710 if (!sourceFile->isRttiRT()) {
58 // Add external global pointer for TypeInfo vtable
59
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 312 assert(sourceFile->isRuntimeModuleAvailable(RuntimeModule::RTTI_RT));
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 312 const std::string typeInfoMangledName = NameMangling::mangleVTable("TypeInfo");
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 312 llvm::Constant *typeInfoExtPtr = module->getOrInsertGlobal(typeInfoMangledName, builder.getPtrTy());
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 312 typeInfoVTable = llvm::ConstantExpr::getInBoundsGetElementPtr(ptrTy, typeInfoExtPtr, builder.getInt64(2));
63 312 }
64 355 std::vector<llvm::Constant *> fieldValues;
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 355 fieldValues.push_back(typeInfoVTable);
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 355 fieldValues.push_back(typeInfoName);
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 505 for (const QualType &interfaceType : interfaceTypes) {
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 150 const Interface *interface = interfaceType.getInterface(nullptr);
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 150 assert(interface != nullptr && interface->vTableData.typeInfo != nullptr);
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 150 const std::string interfaceMangledName = NameMangling::mangleTypeInfo(interface);
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 150 llvm::Constant *global = module->getOrInsertGlobal(interfaceMangledName, builder.getPtrTy());
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 150 fieldValues.push_back(global);
73 150 }
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 355 llvm::Constant *typeInfo = llvm::ConstantStruct::get(spiceStruct->vTableData.typeInfoType, fieldValues);
75
76 // Generate global variable
77
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 355 module->getOrInsertGlobal(mangledName, spiceStruct->vTableData.typeInfoType);
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 355 llvm::GlobalVariable *global = module->getNamedGlobal(mangledName);
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 355 global->setInitializer(typeInfo);
80
81 // Set global attributes
82 355 global->setConstant(true);
83 355 global->setDSOLocal(true);
84 355 global->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::None);
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 355 global->setLinkage(llvm::GlobalValue::ExternalLinkage);
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 355 global->setComdat(module->getOrInsertComdat(mangledName));
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 355 global->setAlignment(llvm::MaybeAlign(8));
88
89 355 return spiceStruct->vTableData.typeInfo = global;
90 355 }
91
92 355 llvm::Constant *IRGenerator::generateVTable(StructBase *spiceStruct) const {
93 // Retrieve virtual method count
94
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 355 const std::vector<Function *> virtualMethods = spiceStruct->scope->getVirtualMethods();
95 355 const size_t virtualMethodCount = virtualMethods.size();
96 355 const size_t arrayElementCount = virtualMethodCount + 2; // +2 for nullptr and TypeInfo
97
98 // Generate type info data structures
99
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 355 generateTypeInfo(spiceStruct);
100
101 // Generate VTable type
102
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 355 llvm::ArrayType *vtableArrayTy = llvm::ArrayType::get(builder.getPtrTy(), arrayElementCount);
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 355 spiceStruct->vTableData.vtableType = llvm::StructType::get(context, vtableArrayTy, false);
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105
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 355 const std::string mangledName = NameMangling::mangleVTable(spiceStruct);
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 355 module->getOrInsertGlobal(mangledName, spiceStruct->vTableData.vtableType);
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 355 llvm::GlobalVariable *global = module->getNamedGlobal(mangledName);
108
109 // Set global attributes
110 355 global->setConstant(true);
111 355 global->setDSOLocal(true);
112 355 global->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
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 355 global->setLinkage(llvm::GlobalValue::ExternalLinkage);
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 355 global->setComdat(module->getOrInsertComdat(mangledName));
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 355 global->setAlignment(llvm::MaybeAlign(8));
116
117 355 return spiceStruct->vTableData.vtable = global;
118 355 }
119
120 355 void IRGenerator::generateVTableInitializer(const StructBase *spiceStruct) const {
121 // Retrieve virtual method count
122
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 355 assert(spiceStruct->scope);
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 355 const std::vector<Function *> virtualMethods = spiceStruct->scope->getVirtualMethods();
124 355 const size_t virtualMethodCount = virtualMethods.size();
125 355 const size_t arrayElementCount = virtualMethodCount + 2; // +2 for nullptr and TypeInfo
126
127 // Generate VTable type
128
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 355 llvm::PointerType *ptrTy = builder.getPtrTy();
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 355 llvm::ArrayType *vtableArrayTy = llvm::ArrayType::get(ptrTy, arrayElementCount);
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 355 assert(spiceStruct->vTableData.vtableType);
131
132 // Generate VTable values
133 355 std::vector<llvm::Constant *> arrayValues;
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 355 arrayValues.push_back(llvm::Constant::getNullValue(ptrTy)); // nullptr as safety guard
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 355 arrayValues.push_back(spiceStruct->vTableData.typeInfo); // TypeInfo to identify the type for the VTable
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 1160 for (Function *virtualMethod : virtualMethods) {
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 805 assert(spiceStruct->scope->type == ScopeType::INTERFACE || virtualMethod->llvmFunction != nullptr);
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 805 arrayValues.push_back(virtualMethod->llvmFunction ? virtualMethod->llvmFunction : llvm::Constant::getNullValue(ptrTy));
139 }
140
141 // Generate VTable struct
142 355 std::vector<llvm::Constant *> fieldValues;
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 355 fieldValues.push_back(llvm::ConstantArray::get(vtableArrayTy, arrayValues));
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 355 llvm::Constant *initializer = llvm::ConstantStruct::get(spiceStruct->vTableData.vtableType, fieldValues);
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 355 const std::string mangledName = NameMangling::mangleVTable(spiceStruct);
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 355 llvm::GlobalVariable *global = module->getNamedGlobal(mangledName);
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 355 assert(global != nullptr);
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 355 global->setInitializer(initializer);
150 355 }
151
152 } // namespace spice::compiler
153