vmann/xlang
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use less temporaries

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This commit is contained in:
Thomas Lindner 2023-01-05 19:52:27 +01:00
parent 577581f2ce
commit d46f7fb91f
2 changed files with 32 additions and 25 deletions
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43
bootstrap/emit.cc
View file

@ -3,6 +3,11 @@
namespace xlang {
std::string EmitVisitor::tmp() {
last = "%t" + std::to_string(tmpcount++);
return last;
}
EmitVisitor::EmitVisitor(std::string_view outputfile) : output{outputfile} {}
std::any EmitVisitor::visitFile(xlangParser::FileContext *ctx) {
@ -32,8 +37,8 @@ std::any EmitVisitor::visitStatement(xlangParser::StatementContext *ctx) {
if (auto identifier = ctx->Identifier()) {
tmpcount = 0;
visitExpr(ctx->expr());
output << " %_" << identifier->getSymbol()->getText() << " = w copy %t"
<< tmpcount - 1 << std::endl;
output << " %_" << identifier->getSymbol()->getText() << " = w copy "
<< last << std::endl;
return {};
}
if (ctx->If()) {
@ -41,8 +46,8 @@ std::any EmitVisitor::visitStatement(xlangParser::StatementContext *ctx) {
output << "@if" << block << "_expr" << std::endl;
tmpcount = 0;
visitExpr(ctx->expr());
output << " jnz %t" << tmpcount - 1 << ", @if" << block << "_then, @if"
<< block << "_else" << std::endl;
output << " jnz " << last << ", @if" << block << "_then, @if" << block
<< "_else" << std::endl;
output << "@if" << block << "_then" << std::endl;
visitBlock(ctx->block(0));
output << " jmp @if" << block << "_end" << std::endl;
@ -58,8 +63,8 @@ std::any EmitVisitor::visitStatement(xlangParser::StatementContext *ctx) {
output << "@while" << block << "_expr" << std::endl;
tmpcount = 0;
visitExpr(ctx->expr());
output << " jnz %t" << tmpcount - 1 << ", @while" << block
<< "_body, @while" << block << "_end" << std::endl;
output << " jnz " << last << ", @while" << block << "_body, @while"
<< block << "_end" << std::endl;
output << "@while" << block << "_body" << std::endl;
visitBlock(ctx->block(0));
output << " jmp @while" << block << "_expr" << std::endl;
@ -69,14 +74,14 @@ std::any EmitVisitor::visitStatement(xlangParser::StatementContext *ctx) {
if (ctx->Return()) {
tmpcount = 0;
visitExpr(ctx->expr());
output << " ret %t" << tmpcount - 1 << std::endl;
output << " ret " << last << std::endl;
output << "@dead" << blockcount++ << std::endl;
return {};
}
if (ctx->Print()) {
tmpcount = 0;
visitExpr(ctx->expr());
output << " call $printf(l $printformat, ..., w %t" << tmpcount - 1 << ")"
output << " call $printf(l $printformat, ..., w " << last << ")"
<< std::endl;
return {};
}
@ -87,11 +92,11 @@ std::any EmitVisitor::visitStatement(xlangParser::StatementContext *ctx) {
#define OPERATOR(Operator, visitLeft, left, visitRight, right, ssa_op) \
if (ctx->Operator()) { \
visitLeft(ctx->left); \
int l = tmpcount - 1; \
std::string l = last; \
visitRight(ctx->right); \
output << " %t" << tmpcount << " = w " ssa_op " %t" << l << ", %t" \
<< tmpcount - 1 << std::endl; \
tmpcount++; \
std::string r = last; \
output << " " << tmp() << " = w " ssa_op " " << l << ", " << r \
<< std::endl; \
return {}; \
}
@ -122,28 +127,26 @@ std::any EmitVisitor::visitTerm(xlangParser::TermContext *ctx) {
std::any EmitVisitor::visitFactor(xlangParser::FactorContext *ctx) {
if (auto integer = ctx->Integer()) {
output << " %t" << tmpcount++ << " = w copy "
<< integer->getSymbol()->getText() << std::endl;
last = integer->getSymbol()->getText();
return {};
}
if (auto identifier = ctx->Identifier()) {
if (ctx->LeftParen()) {
std::vector<int> args;
std::vector<std::string> args;
if (auto expr_list = ctx->exprList()) {
for (auto expr : expr_list->expr()) {
visitExpr(expr);
args.push_back(tmpcount - 1);
args.push_back(last);
}
}
output << " %t" << tmpcount++ << " = w call $"
output << " " << tmp() << " = w call $"
<< identifier->getSymbol()->getText() << "(";
for (auto arg : args) {
output << "w %t" << arg << ", ";
output << "w " << arg << ", ";
}
output << ")" << std::endl;
} else {
output << " %t" << tmpcount++ << " = w copy %_"
<< identifier->getSymbol()->getText() << std::endl;
last = "%_" + identifier->getSymbol()->getText();
}
return {};
}

4
bootstrap/emit.hh
View file

@ -1,6 +1,7 @@
#pragma once
#include <fstream>
#include <string>
#include <string_view>
#include <xlangBaseVisitor.h>
@ -10,6 +11,9 @@ class EmitVisitor : public xlangBaseVisitor {
std::ofstream output;
int blockcount;
int tmpcount;
std::string last;
std::string tmp();
public:
EmitVisitor(std::string_view outputfile);