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Add C++ Template Metaprogramming Backend #39

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9 changes: 9 additions & 0 deletions Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,7 @@ ELC_SRCS := \
c.c \
cl.c \
cpp.c \
cpp_template.c \
cr.c \
cs.c \
el.c \
Expand Down Expand Up @@ -311,6 +312,14 @@ TOOL := g++-6
include target.mk
$(OUT.eir.cpp.out): tools/runcpp.sh

ifdef CPP_TEMPLATE
TARGET := cpp_template
RUNNER := tools/runcpp_template.sh
TOOL := g++
include target.mk
$(OUT.eir.cpp_template.out): tools/runcpp_template.sh
endif

ifeq ($(uname),Linux)
TARGET := $(ARCH)
RUNNER :=
Expand Down
5 changes: 3 additions & 2 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,8 @@ Currently, there are 31 backends:
* Befunge
* Brainfuck
* C
* C++14 (compile-time) (by [@kw-udon](https://github.com/kw-udon/))
* C++14 constexpr (compile-time) (by [@kw-udon](https://github.com/kw-udon/))
* C++ Template Metaprogramming (compile-time) (by [@kw-udon](https://github.com/kw-udon/)) (WIP)
* C# (by [@masaedw](https://github.com/masaedw/))
* C-INTERCAL
* CommonLisp (by [@youz](https://github.com/youz/))
Expand Down Expand Up @@ -214,7 +215,7 @@ You can find more descriptions and released vim script in
This backend was contributed by [@hak7a3](https://github.com/hak7a3/). See
also [8cc.tex](https://github.com/hak7a3/8cc.tex).

### C++14 (compile-time)
### C++14 constexpr (compile-time)

This backend was contributed by [@kw-udon](https://github.com/kw-udon/). You can find more
descriptions in
Expand Down
243 changes: 243 additions & 0 deletions target/cpp_template.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,243 @@
#include <ir/ir.h>
#include <target/util.h>
#include <target/cpp_template_lib.h>

static void cpp_template_emit_file_prologue(void) {
emit_line("#include <cstdio>");
emit_line("");
emit_line(cpp_template_lib);
emit_line("");
emit_line("typedef enum { a, b, c, d, bp, sp } Reg_Name;");
}

static const char* cpp_template_op_str(Inst* inst) {
const char * op_str;
const char * src_str = inst->src.type == REG ? "reg" : "imm";
switch (inst->op) {
case MOV:
op_str = "mov"; break;
case ADD:
op_str = "add"; break;
case SUB:
op_str = "sub"; break;
case LOAD:
op_str = "load"; break;
case STORE:
op_str = "store"; break;
case PUTC:
op_str = "putc"; break;
case EQ:
case NE:
case LT:
case GT:
case LE:
case GE:
op_str = "cmp"; break;
case JEQ:
case JNE:
case JLT:
case JGT:
case JLE:
case JGE:
op_str = "jcmp"; break;
default:
error("oops");
}
return format("%s_%s", op_str, src_str);
}


int reg_id = 0;
int mem_id = 0;
int buf_id = 0;
int exit_flag = 0;

static void cpp_template_emit_inst(Inst* inst) {
switch (inst->op) {
case MOV:
case ADD:
case SUB:
emit_line("typedef %s<r%d, %s, %s> r%d;",
cpp_template_op_str(inst),
reg_id, reg_names[inst->dst.reg], src_str(inst), reg_id + 1);
reg_id++;
break;

case LOAD:
emit_line("typedef %s<r%d, m%d, %s, %s> r%d;",
cpp_template_op_str(inst),
reg_id, mem_id, reg_names[inst->dst.reg], src_str(inst), reg_id + 1);
reg_id++;
break;

case STORE:
emit_line("typedef %s<r%d, m%d, %s, %s> m%d;",
cpp_template_op_str(inst),
reg_id, mem_id, reg_names[inst->dst.reg], src_str(inst), mem_id + 1);
mem_id++;
break;

case PUTC:
emit_line("typedef %s<r%d, b%d,%s> b%d;",
cpp_template_op_str(inst),
reg_id, buf_id, src_str(inst), buf_id + 1);
buf_id++;
break;

case GETC:
emit_line("typedef getc_reg<r%d, %s> r%d;",
reg_id, reg_names[inst->dst.reg], reg_id + 1);
reg_id++;
break;

case EXIT:
emit_line("typedef exit_inst<r%d> r%d;",
reg_id, reg_id + 1);
exit_flag = 1;
reg_id++;
return;

case DUMP:
break;

case EQ:
case NE:
case LT:
case GT:
case LE:
case GE:
emit_line("typedef %s<r%d, %s, %s, %d> r%d;",
cpp_template_op_str(inst),
reg_id,
reg_names[inst->dst.reg],
src_str(inst),
inst->op - EQ,
reg_id + 1);
reg_id++;
break;

case JEQ:
case JNE:
case JLT:
case JGT:
case JLE:
case JGE:
emit_line("typedef %s<r%d, %s - 1, %s, %s, %d> r%d;",
cpp_template_op_str(inst),
reg_id,
value_str(&inst->jmp),
reg_names[inst->dst.reg],
src_str(inst),
inst->op - JEQ,
reg_id + 1);
reg_id++;
break;

case JMP:
emit_line("typedef jmp_%s<r%d, %s> r%d;",
inst->jmp.type == REG ? "reg" : "imm",
reg_id, value_str(&inst->jmp), reg_id + 1);
reg_id++;
break;

default:
error("oops");
}
return;
}

static void cpp_template_emit_pc_change(int pc) {
emit_line("typedef inc_pc<r%d, m%d, b%d> result;", reg_id, mem_id, buf_id);
dec_indent();
emit_line("};");
emit_line("");
emit_line("template <typename r0, typename m0, typename b0>");
emit_line("struct func_switch_impl<r0, m0, b0, %d> {", pc);
inc_indent();
}

static void cpp_template_emit_func_epilogue() {
emit_line("typedef inc_pc<r%d, m%d, b%d> result;", reg_id, mem_id, buf_id);
dec_indent();
emit_line("};");
emit_line("");
emit_line("template <typename env, int pc>");
emit_line("struct func_switch : func_switch_impl<"
"typename env::regs, typename env::mem, "
"typename env::buf, pc>::result {};");
}

void cpp_template_emit_func_switch_impl(Inst* inst) {
int prev_pc = 0;
emit_line("template <typename r0, typename m0, typename b0, int pc>");
emit_line("struct func_switch_impl { typedef inc_pc<r0, m0, b0> result; };");
emit_line("");
emit_line("template <typename r0, typename m0, typename b0>");
emit_line("struct func_switch_impl<r0, m0, b0, 0> {");
inc_indent();
for (; inst; inst = inst->next) {
if (prev_pc != inst->pc) {
cpp_template_emit_pc_change(inst->pc);
reg_id = 0;
mem_id = 0;
buf_id = 0;
exit_flag = 0;
}
prev_pc = inst->pc;

cpp_template_emit_inst(inst);
}
cpp_template_emit_func_epilogue();
}

static void cpp_template_emit_main_loop(void) {
emit_line("template <typename env, bool, int>");
emit_line("struct main_loop { typedef env result; };");
emit_line("template <typename env, int pc>");
emit_line("struct main_loop<env, false, pc> {");
inc_indent();
emit_line("typedef func_switch<env, pc> env2;");
emit_line("typedef typename main_loop<env2, env2::regs::exit_flag, env2::regs::pc>::result result;");
dec_indent();
emit_line("};");
}

static void cpp_template_emit_calc_main(Data* data) {
emit_line("struct calc_main {");
inc_indent();
emit_line("typedef init_memory<MEM_SIZE> mem0;");
int mp;
for (mp = 0; data; data = data->next, mp++) {
if (data->v) {
emit_line("typedef store_value<mem%d, %d, %d> mem%d;", mp, mp, data->v, mp + 1);
} else {
emit_line("typedef mem%d mem%d;", mp, mp + 1);
}
}
emit_line("typedef init_regs<0> regs;");
emit_line(" typedef make_env<regs, mem%d, Nil> env;", mp);
emit_line("typedef main_loop<env, false, 0>::result result;");
dec_indent();
emit_line("};");
}

void target_cpp_template(Module* module) {
cpp_template_emit_file_prologue();
emit_line("");

cpp_template_emit_func_switch_impl(module->text);
emit_line("");

cpp_template_emit_main_loop();
emit_line("");

cpp_template_emit_calc_main(module->data);
emit_line("");

emit_line("int main() {");
inc_indent();
emit_line("typedef calc_main::result result;");
emit_line("print_buffer<result::buf>::run();");
dec_indent();
emit_line("}");
}
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