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In half way of write codegen

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This commit is contained in:
ZhuangYumin
2024-08-28 10:52:32 +00:00
parent 07df48d0f1
commit 46f659053b
6 changed files with 356 additions and 33 deletions
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203
include/naivebackend/naivebackend.h
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@ -1,8 +1,12 @@
#pragma once
#include <cstddef>
#include <ios>
#include <memory>
#include <ostream>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <vector>
#include "IR/IR_basic.h"
class RISCVAsmItemBase {
public:
@ -11,29 +15,180 @@ class RISCVAsmItemBase {
virtual void RecursivePrint(std::ostream &os) const = 0;
};
namespace NaiveBackend {
class RISCVConstStrItem : public RISCVAsmItemBase {
public:
RISCVConstStrItem() = default;
~RISCVConstStrItem() = default;
void RecursivePrint(std::ostream &os) const override;
};
class RISCVGlobalVarItem : public RISCVAsmItemBase {
public:
RISCVGlobalVarItem() = default;
~RISCVGlobalVarItem() = default;
void RecursivePrint(std::ostream &os) const override;
};
class RISCVFuncItem : public RISCVAsmItemBase {
public:
RISCVFuncItem() = default;
~RISCVFuncItem() = default;
void RecursivePrint(std::ostream &os) const override;
};
class RISCVProgItem : public RISCVAsmItemBase {
public:
RISCVProgItem() = default;
~RISCVProgItem() = default;
void RecursivePrint(std::ostream &os) const override;
};
class RISCVConstStrItem : public RISCVAsmItemBase {
public:
std::string full_label;
std::string content;
RISCVConstStrItem() = default;
~RISCVConstStrItem() = default;
void RecursivePrint(std::ostream &os) const override {
os << full_label << ":\n";
os << " .asciz \"";
for (auto c : content) {
if (c == '\n') {
os << "\\n";
} else if (c == '\t') {
os << "\\t";
} else if (c == '\"') {
os << "\\\"";
} else {
os << c;
}
}
os << "\"\n";
}
};
class RISCVGlobalVarItem : public RISCVAsmItemBase {
public:
std::string full_label;
RISCVGlobalVarItem() = default;
~RISCVGlobalVarItem() = default;
void RecursivePrint(std::ostream &os) const override {
os << ".globl " << full_label << "\n";
os << ".p2align 2, 0x0\n";
os << full_label << ":\n";
os << " .word 0\n";
}
};
class RISCVFuncItem : public RISCVAsmItemBase {
friend void ::GenerateNaiveASM(std::ostream &os, std::shared_ptr<ModuleItem> prog);
public:
std::string full_label;
std::vector<std::string> code_lines;
RISCVFuncItem() = default;
~RISCVFuncItem() = default;
void RecursivePrint(std::ostream &os) const override {
os << ".globl " << full_label << "\n";
os << ".p2align 2, 0x0\n";
os << full_label << ":\n";
for (auto &line : code_lines) {
os << line << "\n";
}
}
};
class RISCVProgItem : public RISCVAsmItemBase {
public:
std::vector<std::shared_ptr<RISCVConstStrItem>> const_strs;
std::vector<std::shared_ptr<RISCVGlobalVarItem>> global_vars;
std::vector<std::shared_ptr<RISCVFuncItem>> funcs;
RISCVProgItem() = default;
~RISCVProgItem() = default;
void RecursivePrint(std::ostream &os) const override {
os << ".section .rodata\n";
for (auto &item : const_strs) {
item->RecursivePrint(os);
}
os << ".section .sbss\n";
for (auto &item : global_vars) {
item->RecursivePrint(os);
}
os << ".section .text\n";
for (auto &item : funcs) {
item->RecursivePrint(os);
}
}
};
class FuncLayout {
friend void ::GenerateNaiveASM(std::ostream &os, std::shared_ptr<ModuleItem> prog);
friend void GenerateReadAccess(std::string val, size_t bytes, std::string output_reg, FuncLayout &layout,
std::vector<std::string> &code_lines);
friend inline void GenerateWriteAccess(std::string val, size_t bytes, std::string data_reg, FuncLayout &layout,
std::vector<std::string> &code_lines);
std::unordered_map<std::string, size_t> local_items;
std::unordered_map<std::string, size_t> arg_offset;
size_t cur_pos;
size_t total_frame_size; // should align to 16 bytes
public:
FuncLayout() : cur_pos(8), total_frame_size(16) {}
void AllocateItem(const std::string &name, size_t sz, size_t num = 1) {
if (local_items.find(name) != local_items.end()) throw std::runtime_error("Local item already exists");
if (cur_pos % sz != 0) {
cur_pos += sz - cur_pos % sz;
}
cur_pos += sz * num;
local_items[name] = cur_pos;
total_frame_size = ((cur_pos + 15) / 16) * 16;
std::cerr << "allocating stack memory for " << name << " at " << cur_pos << std::endl;
}
size_t QueryOffeset(const std::string &name) {
if (local_items.find(name) == local_items.end()) throw std::runtime_error("Local item not found");
return local_items[name];
}
size_t QueryFrameSize() const { return total_frame_size; }
};
inline void GenerateReadAccess(std::string val, size_t bytes, std::string output_reg, FuncLayout &layout,
std::vector<std::string> &code_lines) {
if (val.size() > 4 && val.substr(val.size() - 4, 4) == ".val") {
// parameter
if (layout.arg_offset.find(val) == layout.arg_offset.end()) {
throw std::runtime_error("Unknown argument with name=" + val);
}
size_t offset = layout.arg_offset.at(val);
if (offset < 8) {
output_reg = "a" + std::to_string(offset);
} else {
size_t spilled_offset = (offset - 8) * 4; // just*4, which is different from the real riscv
std::string cmd;
if (bytes == 1)
cmd = "lb";
else if (bytes == 4)
cmd = "lw";
else
throw std::runtime_error("Unknown bytes");
cmd += " " + output_reg + ", " + std::to_string(spilled_offset) + "(fp)";
code_lines.push_back(cmd);
}
} else if (val.size() > 13 && val.substr(0, 13) == "@.var.global.") {
// global variable address keeper
std::string label_in_asm = val.substr(1, val.size() - 1);
code_lines.push_back("la " + output_reg + ", " + label_in_asm);
} else if (val.size() > 12 && val.substr(0, 12) == "%.var.local.") {
// local variable address keeper
size_t offset = layout.QueryOffeset(val);
code_lines.push_back("addi " + output_reg + ", fp, -" + std::to_string(offset));
} else if (val.size() > 10 && val.substr(0, 10) == "%.var.tmp.") {
// tmp variable, not address keeper
size_t offset = layout.QueryOffeset(val);
code_lines.push_back("addi " + output_reg + ", fp, -" + std::to_string(offset));
if (bytes == 1) {
code_lines.push_back("lb " + output_reg + ", 0(" + output_reg + ")");
} else if (bytes == 4) {
code_lines.push_back("lw " + output_reg + ", 0(" + output_reg + ")");
} else {
throw std::runtime_error("Unknown bytes");
}
} else {
throw std::runtime_error("Unknown variable type with name=" + val);
}
}
inline void GenerateWriteAccess(std::string val, size_t bytes, std::string data_reg, FuncLayout &layout,
std::vector<std::string> &code_lines) {
if (val.size() > 4 && val.substr(val.size() - 4, 4) == ".val") {
// parameter
throw std::runtime_error("Cannot write to a parameter");
} else if (val.size() > 13 && val.substr(0, 13) == "@.var.global.") {
// global variable address keeper
throw std::runtime_error("Cannot write to a global variable address keeper");
} else if (val.size() > 12 && val.substr(0, 12) == "%.var.local.") {
// local variable address keeper
throw std::runtime_error("Cannot write to a local variable address keeper");
} else if (val.size() > 10 && val.substr(0, 10) == "%.var.tmp.") {
// tmp variable, not address keeper
size_t offset = layout.QueryOffeset(val);
code_lines.push_back("addi " + data_reg + ", fp, -" + std::to_string(offset));
if (bytes == 1) {
code_lines.push_back("sb " + data_reg + ", 0(" + data_reg + ")");
} else if (bytes == 4) {
code_lines.push_back("sw " + data_reg + ", 0(" + data_reg + ")");
} else {
throw std::runtime_error("Unknown bytes");
}
} else {
throw std::runtime_error("Unknown variable type with name=" + val);
}
}
} // namespace NaiveBackend
void GenerateNaiveASM(std::ostream &os, std::shared_ptr<ModuleItem> prog);