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//===-- bind.cpp ----------------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the Boost Software License. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "bind.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "valueparser.h"
#if LDC_LLVM_VER >= 1000
#if LDC_LLVM_VER >= 1100
#define LLAlign llvm::Align
#else
#define LLAlign llvm::MaybeAlign
#endif
#define LLMaybeAlign llvm::MaybeAlign
#else
#define LLAlign
#define LLMaybeAlign
#endif
namespace {
enum { SmallParamsCount = 5 };
llvm::FunctionType *getDstFuncType(llvm::FunctionType &srcType,
const llvm::ArrayRef<ParamSlice> ¶ms) {
assert(!srcType.isVarArg());
llvm::SmallVector<llvm::Type *, SmallParamsCount> newParams;
const auto srcParamsCount = srcType.params().size();
assert(params.size() == srcParamsCount);
for (size_t i = 0; i < srcParamsCount; ++i) {
if (params[i].data == nullptr) {
newParams.push_back(srcType.getParamType(static_cast<unsigned>(i)));
}
}
auto retType = srcType.getReturnType();
return llvm::FunctionType::get(retType, newParams, /*isVarArg*/ false);
}
llvm::Function *createBindFunc(llvm::Module &module, llvm::Function &srcFunc,
llvm::Function &exampleFunc,
llvm::FunctionType &funcType,
const llvm::ArrayRef<ParamSlice> ¶ms) {
auto newFunc = llvm::Function::Create(
&funcType, llvm::GlobalValue::ExternalLinkage, "\1.jit_bind", &module);
newFunc->setCallingConv(srcFunc.getCallingConv());
// auto srcAttributes = srcFunc.getAttributes();
// newFunc->addAttributes(llvm::AttributeList::ReturnIndex,
// srcAttributes.getRetAttributes());
// newFunc->addAttributes(llvm::AttributeList::FunctionIndex,
// srcAttributes.getFnAttributes());
// unsigned dstInd = 0;
// for (size_t i = 0; i < params.size(); ++i) {
// if (params[i].data == nullptr) {
// newFunc->addAttributes(llvm::AttributeList::FirstArgIndex + dstInd,
// srcAttributes.getParamAttributes(
// static_cast<unsigned>(i)));
// ++dstInd;
// }
// }
// assert(dstInd == funcType.getNumParams());
newFunc->setAttributes(exampleFunc.getAttributes());
return newFunc;
}
llvm::Value *
allocParam(llvm::IRBuilder<> &builder, llvm::Type &srcType,
const llvm::DataLayout &layout, const ParamSlice ¶m,
llvm::function_ref<void(const std::string &)> errHandler,
const BindOverride &override) {
if (param.type == ParamType::Aggregate && srcType.isPointerTy()) {
auto elemType = llvm::cast<llvm::PointerType>(&srcType)->getElementType();
auto stackArg = builder.CreateAlloca(elemType);
if (auto alignment = layout.getABITypeAlignment(elemType))
stackArg->setAlignment(LLAlign(alignment));
auto init =
parseInitializer(layout, *elemType, param.data, errHandler, override);
builder.CreateStore(init, stackArg);
return stackArg;
}
auto stackArg = builder.CreateAlloca(&srcType);
if (auto alignment = layout.getABITypeAlignment(&srcType))
stackArg->setAlignment(LLAlign(alignment));
auto init =
parseInitializer(layout, srcType, param.data, errHandler, override);
builder.CreateStore(init, stackArg);
return builder.CreateLoad(stackArg);
}
void doBind(llvm::Module &module, llvm::Function &dstFunc,
llvm::Function &srcFunc, const llvm::ArrayRef<ParamSlice> ¶ms,
llvm::function_ref<void(const std::string &)> errHandler,
const BindOverride &override) {
auto &context = dstFunc.getContext();
auto bb = llvm::BasicBlock::Create(context, "", &dstFunc);
llvm::IRBuilder<> builder(context);
builder.SetInsertPoint(bb);
llvm::SmallVector<llvm::Value *, SmallParamsCount> args;
auto currentArg = dstFunc.arg_begin();
auto funcType = srcFunc.getFunctionType();
auto &layout = module.getDataLayout();
for (size_t i = 0; i < params.size(); ++i) {
llvm::Value *arg = nullptr;
const auto ¶m = params[i];
if (param.data == nullptr) {
arg = currentArg;
++currentArg;
} else {
auto type = funcType->getParamType(static_cast<unsigned>(i));
arg = allocParam(builder, *type, layout, param, errHandler, override);
}
assert(arg != nullptr);
args.push_back(arg);
}
assert(currentArg == dstFunc.arg_end());
auto ret = builder.CreateCall(&srcFunc, args);
if (!srcFunc.isDeclaration()) {
ret->addAttribute(llvm::AttributeList::FunctionIndex,
llvm::Attribute::AlwaysInline);
}
ret->setCallingConv(srcFunc.getCallingConv());
ret->setAttributes(srcFunc.getAttributes());
if (dstFunc.getReturnType()->isVoidTy()) {
builder.CreateRetVoid();
} else {
builder.CreateRet(ret);
}
}
}
llvm::Function *
bindParamsToFunc(llvm::Module &module, llvm::Function &srcFunc,
llvm::Function &exampleFunc,
const llvm::ArrayRef<ParamSlice> ¶ms,
llvm::function_ref<void(const std::string &)> errHandler,
const BindOverride &override) {
auto srcType = srcFunc.getFunctionType();
auto dstType = getDstFuncType(*srcType, params);
auto newFunc = createBindFunc(module, srcFunc, exampleFunc, *dstType, params);
doBind(module, *newFunc, srcFunc, params, errHandler, override);
return newFunc;
}
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