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// Intel specific conversion: Abstract Graph -> Machine specific segment
#include "encode.h"
#include "asm/assembler.h"
#include "asm/parse.h"
#include "minicc.h"
#include <boost/endian/conversion.hpp>
#include <exception>
namespace {
std::shared_ptr<Op> makeLoadValue(const FlowGraph::Data& data, const FlowGraph::Graph& graph)
{
if (data.type() != FlowGraph::DataType::Int) {
std::runtime_error("Bad type for operand: "s + std::to_string(int(data.type())));
}
if (!data.storage())
throw std::runtime_error("ICE: Operand storage is 0");
auto& data_storage{*data.storage()};
if (typeid(data_storage) == typeid(FlowGraph::Constant)) {
FlowGraph::Constant& value {dynamic_cast<FlowGraph::Constant&>(data_storage)};
if (value.value().size() < sizeof(uint32_t))
throw std::runtime_error("ICE: Int data from operand needs at least 4 bytes, got "s + std::to_string(value.value().size()));
uint32_t immediate = from_little_endian(value.value());
return makeOp("mov", Asm::Args{{Asm::Args::Register32("eax"), Asm::Args::Immediate32(immediate)}});
} else if (typeid(data_storage) == typeid(FlowGraph::TemporaryStorage)) {
//FlowGraph::TemporaryStorage& storage {dynamic_cast<FlowGraph::TemporaryStorage&>(data_storage)};
index_t index { graph.scope()->indexOfData(data)};
return makeOp("mov", Asm::Args{{Asm::Args::Register32("eax"), Asm::Args::Mem32Ptr64("rbp", int32_t(index) * -4)}});
} else
throw std::runtime_error("ICE: Unsupported type for operand data at load: "s + demangle(typeid(data_storage)));
}
std::shared_ptr<Op> makeStoreValue(const FlowGraph::Data& data, const FlowGraph::Graph& graph)
{
if (data.type() != FlowGraph::DataType::Int) {
std::runtime_error("Bad type for operand: "s + std::to_string(int(data.type())));
}
if (!data.storage())
throw std::runtime_error("ICE: Operand storage is 0");
auto& data_storage{*data.storage()};
if (typeid(data_storage) == typeid(FlowGraph::TemporaryStorage)) {
//FlowGraph::TemporaryStorage& storage {dynamic_cast<FlowGraph::TemporaryStorage&>(data_storage)};
index_t index { graph.scope()->indexOfData(data)};
return makeOp("mov", Asm::Args{{Asm::Args::Mem32Ptr64("rbp", int32_t(index) * -4), Asm::Args::Register32("eax")}});
} else
throw std::runtime_error("ICE: Unsupported type for operand data at store: "s + demangle(typeid(data_storage)));
}
std::shared_ptr<Op> makeAddValue(const FlowGraph::Data& data, const FlowGraph::Graph& graph)
{
if (data.type() != FlowGraph::DataType::Int) {
std::runtime_error("Bad type for operand: "s + std::to_string(int(data.type())));
}
if (!data.storage())
throw std::runtime_error("ICE: Operand storage is 0");
auto& data_storage{*data.storage()};
if (typeid(data_storage) == typeid(FlowGraph::Constant)) {
FlowGraph::Constant& value {dynamic_cast<FlowGraph::Constant&>(data_storage)};
if (value.value().size() < sizeof(uint32_t))
throw std::runtime_error("ICE: Int data from operand needs at least 4 bytes, got "s + std::to_string(value.value().size()));
uint32_t immediate = from_little_endian(value.value());
return makeOp("add", Asm::Args{{Asm::Args::Register32("eax"), Asm::Args::Immediate32(immediate)}});
} else if (typeid(data_storage) == typeid(FlowGraph::TemporaryStorage)) {
//FlowGraph::TemporaryStorage& storage {dynamic_cast<FlowGraph::TemporaryStorage&>(data_storage)};
index_t index { graph.scope()->indexOfData(data)};
return makeOp("add", Asm::Args{{Asm::Args::Register32("eax"), Asm::Args::Mem32Ptr64("rbp", int32_t(index) * -4)}});
} else
throw std::runtime_error("ICE: Unsupported type for operand data at add: "s + demangle(typeid(data_storage)));
}
std::vector<std::shared_ptr<Chunk>> makeMulValue(const FlowGraph::Data& data, const FlowGraph::Graph& graph)
{
if (data.type() != FlowGraph::DataType::Int) {
std::runtime_error("Bad type for operand: "s + std::to_string(int(data.type())));
}
if (!data.storage())
throw std::runtime_error("ICE: Operand storage is 0");
auto& data_storage{*data.storage()};
if (typeid(data_storage) == typeid(FlowGraph::Constant)) {
FlowGraph::Constant& value {dynamic_cast<FlowGraph::Constant&>(data_storage)};
if (value.value().size() < sizeof(uint32_t))
throw std::runtime_error("ICE: Int data from operand needs at least 4 bytes, got "s + std::to_string(value.value().size()));
uint32_t immediate = from_little_endian(value.value());
return {{
makeOp("mov", Asm::Args{{Asm::Args::Register32("ebx"), Asm::Args::Immediate32(immediate)}}),
makeOp("mul", Asm::Args{{Asm::Args::Register32("ebx")}})
}};
} else if (typeid(data_storage) == typeid(FlowGraph::TemporaryStorage)) {
//FlowGraph::TemporaryStorage& storage {dynamic_cast<FlowGraph::TemporaryStorage&>(data_storage)};
index_t index { graph.scope()->indexOfData(data)};
return {{makeOp("mul", Asm::Args{{Asm::Args::Mem32Ptr64("rbp", int32_t(index) * -4)}})}};
} else
throw std::runtime_error("ICE: Unsupported type for operand data at mul: "s + demangle(typeid(data_storage)));
}
} // namespace
void Asm::toMachineCode(const FlowGraph::Graph& graph, Segment& segment)
{
segment.clear();
for (const std::shared_ptr<FlowGraph::Node>& node: graph) {
if (node.get()) {
auto& node_deref = *node.get();
if (typeid(node_deref) == typeid(FlowGraph::UnaryOperation)) {
FlowGraph::UnaryOperation& op {dynamic_cast<FlowGraph::UnaryOperation&>(*node)};
auto operands {op.operands()};
if (operands.size() != 2)
throw std::runtime_error("ICE: Bad number of operands for UnaryOperation: "s + std::to_string(operands.size()));
if (op.type() == FlowGraph::UnaryOperationType::BitwiseNot) {
segment.push_back(makeLoadValue(operands[1], graph));
segment.push_back(parseAsm("not eax"));
segment.push_back(makeStoreValue(operands[0], graph));
} else if (op.type() == FlowGraph::UnaryOperationType::LogicalNot) {
segment.push_back(makeLoadValue(operands[1], graph));
segment.push_back(parseAsm("bsr eax")); // ZF=1 iff eax=0
segment.push_back(parseAsm("lahf")); // ZF in AH bit 6
segment.push_back(parseAsm("shr eax, 14")); // ZF in eax bit 0
segment.push_back(parseAsm("and eax, 1")); // now, 0 or 1 is in eax, negated because of zero flag
segment.push_back(makeStoreValue(operands[0], graph));
} else if (op.type() == FlowGraph::UnaryOperationType::Minus) {
segment.push_back(makeLoadValue(operands[1], graph));
segment.push_back(parseAsm("neg eax"));
segment.push_back(makeStoreValue(operands[0], graph));
} else
throw std::runtime_error("ICE: Asm: Unsupported unary operation type: "s + std::to_string(static_cast<int>(op.type())));
} else if (typeid(node_deref) == typeid(FlowGraph::BinaryOperation)) {
FlowGraph::BinaryOperation& op {dynamic_cast<FlowGraph::BinaryOperation&>(*node)};
auto operands {op.operands()};
if (operands.size() != 3)
throw std::runtime_error("ICE: Bad number of operands for BinaryOperation: "s + std::to_string(operands.size()));
if (op.type() == FlowGraph::BinaryOperationType::Add) {
segment.push_back(makeLoadValue(operands[1], graph));
segment.push_back(makeAddValue(operands[2], graph));
segment.push_back(makeStoreValue(operands[0], graph));
} else if (op.type() == FlowGraph::BinaryOperationType::Multiply) {
segment.push_back(makeLoadValue(operands[1], graph));
segment.append(makeMulValue(operands[2], graph));
segment.push_back(makeStoreValue(operands[0], graph));
} else
throw std::runtime_error("ICE: Asm: Unsupported binary operation type: "s + std::to_string(static_cast<int>(op.type())));
} else if (typeid(node_deref) == typeid(FlowGraph::CreateScopeOp)) {
//FlowGraph::CreateScopeOp& op {dynamic_cast<FlowGraph::CreateScopeOp&>(*node)}; // TODO: Create stack frame
//segment.push_back(makeOp("push", Asm::Args{{Asm::Args::Register64("rbp")}}));
//segment.push_back(makeOp("mov", Asm::Args{{Asm::Args::Register64("rbp"), Asm::Args::Register64("rsp")}}));
} else if (typeid(node_deref) == typeid(FlowGraph::DestroyScopeOp)) {
//FlowGraph::DestroyScopeOp& op {dynamic_cast<FlowGraph::DestroyScopeOp&>(*node)}; // TODO: Destroy stack frame
//segment.push_back(makeOp("pop", Asm::Args{{Asm::Args::Register64("rbp")}}));
segment.push_back(makeLoadValue(graph.lastOp()->destination(), graph)); // TODO: Just get last operation result to eax for now
segment.push_back(makeOp("xor", Asm::Args{{Asm::Args::Register64("rdi"), Asm::Args::Register64("rdi")}}));
segment.push_back(makeOp("mov", Asm::Args{{Asm::Args::Register32("edi"), Asm::Args::Register32("eax")}}));
segment.push_back(makeOp("mov", Asm::Args{{Asm::Args::Register64("rax"), Asm::Args::Immediate32(60)}})); // syscall 60: exit()
segment.push_back(makeOp("syscall")); // rax: #syscall, rdi: exit code value
} else if (typeid(node_deref) == typeid(FlowGraph::DataNode)) {
// ignore: Immediate data is used in subsequent nodes
} else {
throw std::runtime_error("ICE: Encoding: Unsupported node: "s + demangle(typeid(node_deref)));
}
} else {
throw std::runtime_error("ICE: encode: flowgraph node is null");
}
}
}
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