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//===-- valueparser.cpp ---------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the Boost Software License. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "valueparser.h"
#include <cassert>
#include <cstdint>
#include <string>
#include "utils.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/Support/raw_ostream.h"
namespace {
void checkOverrideType(
llvm::Type &type, llvm::Constant &val,
const llvm::function_ref<void(const std::string &)> &errHandler) {
auto retType = val.getType();
if (retType != &type) {
std::string str;
llvm::raw_string_ostream ss(str);
ss << "Override type mismatch, expected \"";
type.print(ss);
ss << "\", got \"";
retType->print(ss);
ss << "\"";
ss.flush();
errHandler(str);
}
}
template <typename T>
llvm::Constant *
callOverride(const ParseInitializerOverride &override, llvm::Type &type,
const T &val,
const llvm::function_ref<void(const std::string &)> &errHandler) {
if (override) {
auto ptr = reinterpret_cast<const char *>(&val);
auto ret = (*override)(type, ptr, sizeof(val));
if (ret != nullptr) {
checkOverrideType(type, *ret, errHandler);
}
return ret;
}
return nullptr;
}
llvm::Constant *
getBool(llvm::LLVMContext &context, const void *data, llvm::Type &type,
const llvm::function_ref<void(const std::string &)> &errHandler,
const ParseInitializerOverride &override) {
assert(nullptr != data);
const bool val = *static_cast<const bool *>(data);
if (auto ret = callOverride(override, type, val, errHandler)) {
return ret;
}
return llvm::ConstantInt::get(context, llvm::APInt(1, (val ? 1 : 0), true));
}
template <typename T>
llvm::Constant *
getInt(llvm::LLVMContext &context, const void *data, llvm::Type &type,
const llvm::function_ref<void(const std::string &)> &errHandler,
const ParseInitializerOverride &override) {
assert(nullptr != data);
const T val = *static_cast<const T *>(data);
if (auto ret = callOverride(override, type, val, errHandler)) {
return ret;
}
return llvm::ConstantInt::get(context, llvm::APInt(sizeof(T) * 8, val, true));
}
template <typename T>
llvm::Constant *
getFloat(llvm::LLVMContext &context, const void *data, llvm::Type &type,
const llvm::function_ref<void(const std::string &)> &errHandler,
const ParseInitializerOverride &override) {
assert(nullptr != data);
const T val = *static_cast<const T *>(data);
if (auto ret = callOverride(override, type, val, errHandler)) {
return ret;
}
return llvm::ConstantFP::get(context, llvm::APFloat(val));
}
llvm::Constant *
getPtr(llvm::LLVMContext &context, const void *data, llvm::Type &type,
const llvm::function_ref<void(const std::string &)> &errHandler,
const ParseInitializerOverride &override) {
assert(nullptr != data);
const auto val = *static_cast<const uintptr_t *>(data);
if (auto ret = callOverride(override, type, val, errHandler)) {
return ret;
}
return llvm::ConstantExpr::getIntToPtr(
llvm::ConstantInt::get(context, llvm::APInt(sizeof(val) * 8, val)),
&type);
}
llvm::Constant *
getStruct(const void *data, const llvm::DataLayout &dataLayout,
llvm::Type &type,
const llvm::function_ref<void(const std::string &)> &errHandler,
const ParseInitializerOverride &override) {
assert(nullptr != data);
if (override) {
auto size = dataLayout.getTypeStoreSize(&type);
auto ptr = static_cast<const char *>(data);
auto ret = (*override)(type, ptr, size);
if (ret != nullptr) {
checkOverrideType(type, *ret, errHandler);
return ret;
}
}
auto stype = llvm::cast<llvm::StructType>(&type);
auto slayout = dataLayout.getStructLayout(stype);
auto numElements = stype->getNumElements();
llvm::SmallVector<llvm::Constant *, 16> elements(numElements);
for (unsigned i = 0; i < numElements; ++i) {
const auto elemType = stype->getElementType(i);
const auto elemOffset = slayout->getElementOffset(i);
const auto elemPtr = static_cast<const char *>(data) + elemOffset;
elements[i] =
parseInitializer(dataLayout, *elemType, elemPtr, errHandler, override);
}
return llvm::ConstantStruct::get(stype, elements);
}
}
llvm::Constant *
parseInitializer(const llvm::DataLayout &dataLayout, llvm::Type &type,
const void *data,
llvm::function_ref<void(const std::string &)> errHandler,
const ParseInitializerOverride &override) {
assert(nullptr != data);
auto &llcontext = type.getContext();
if (type.isIntegerTy()) {
const auto width = type.getIntegerBitWidth();
switch (width) {
case 1:
return getBool(llcontext, data, type, errHandler, override);
case 8:
return getInt<uint8_t>(llcontext, data, type, errHandler, override);
case 16:
return getInt<uint16_t>(llcontext, data, type, errHandler, override);
case 32:
return getInt<uint32_t>(llcontext, data, type, errHandler, override);
case 64:
return getInt<uint64_t>(llcontext, data, type, errHandler, override);
default:
errHandler(std::string("Invalid int bit width: ") +
std::to_string(width));
return nullptr;
}
}
if (type.isFloatingPointTy()) {
const auto width = type.getPrimitiveSizeInBits();
switch (width) {
case 32:
return getFloat<float>(llcontext, data, type, errHandler, override);
case 64:
return getFloat<double>(llcontext, data, type, errHandler, override);
default:
errHandler(std::string("Invalid fp bit width: ") + std::to_string(width));
return nullptr;
}
}
if (type.isPointerTy()) {
return getPtr(llcontext, data, type, errHandler, override);
}
if (type.isStructTy()) {
return getStruct(data, dataLayout, type, errHandler, override);
}
if (type.isArrayTy()) {
auto elemType = type.getArrayElementType();
const auto step = dataLayout.getTypeAllocSize(elemType);
const auto numElements = type.getArrayNumElements();
llvm::SmallVector<llvm::Constant *, 16> elements(numElements);
for (uint64_t i = 0; i < numElements; ++i) {
const auto elemPtr = static_cast<const char *>(data) + step * i;
elements[i] = parseInitializer(dataLayout, *elemType, elemPtr, errHandler,
override);
}
return llvm::ConstantArray::get(llvm::cast<llvm::ArrayType>(&type),
elements);
}
std::string tname;
llvm::raw_string_ostream os(tname);
type.print(os, true);
errHandler(std::string("Unhandled type: ") + os.str());
return nullptr;
}
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