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preprocesser publicly exposes only preprocesser function

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The preprocess_* functions are now privately contained within the
implementation file to help the preprocesser outer function.

Furthermore I've simplified the API of the preprocess_* functions by
making them only return pp_err_t and store their results in a vector
parameter taken by reference.
This commit is contained in:
Aryadev Chavali
2024-04-15 18:37:45 +06:30
parent d594c0c531
commit ba3525d533
2 changed files with 51 additions and 63 deletions
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104
asm/preprocesser.cpp
View File

@@ -18,8 +18,6 @@
using std::pair, std::vector, std::make_pair, std::string, std::string_view;
#define ERR(E) std::make_pair(tokens, (E))
#define VAL(E) std::make_pair(E, pp_err_t{pp_err_type_t::OK})
#define VCLEAR(V) \
std::for_each((V).begin(), (V).end(), \
[](token_t *t) \
@@ -27,38 +25,9 @@ using std::pair, std::vector, std::make_pair, std::string, std::string_view;
delete t; \
});
pp_err_t preprocesser(const vector<token_t *> &tokens,
vector<token_t *> &vec_out)
pp_err_t preprocess_use_blocks(const vector<token_t *> &tokens,
vector<token_t *> &vec_out)
{
vector<token_t *> use_block_tokens;
pp_err_t pperr{pp_err_type_t::OK};
std::tie(use_block_tokens, pperr) = preprocess_use_blocks(tokens);
if (pperr.type != pp_err_type_t::OK)
{
vec_out = tokens;
return pperr;
}
vector<token_t *> const_block_tokens;
std::tie(const_block_tokens, pperr) =
preprocess_const_blocks(use_block_tokens);
if (pperr.type != pp_err_type_t::OK)
{
VCLEAR(tokens);
vec_out = use_block_tokens;
return pperr;
}
VCLEAR(use_block_tokens);
vec_out = const_block_tokens;
return pp_err_t{pp_err_type_t::OK};
}
pair<vector<token_t *>, pp_err_t>
preprocess_use_blocks(const vector<token_t *> &tokens)
{
vector<token_t *> new_tokens;
for (size_t i = 0; i < tokens.size(); ++i)
{
token_t *t = tokens[i];
@@ -67,34 +36,34 @@ preprocess_use_blocks(const vector<token_t *> &tokens)
if (i + 1 >= tokens.size() ||
tokens[i + 1]->type != token_type_t::LITERAL_STRING)
{
VCLEAR(new_tokens);
return ERR(pp_err_t(pp_err_type_t::EXPECTED_STRING, t));
VCLEAR(vec_out);
return pp_err_t(pp_err_type_t::EXPECTED_STRING, t);
}
token_t *name = tokens[i + 1];
auto source = read_file(name->content.c_str());
if (!source)
{
VCLEAR(new_tokens);
return ERR(pp_err_t(pp_err_type_t::FILE_NONEXISTENT, name));
VCLEAR(vec_out);
return pp_err_t(pp_err_type_t::FILE_NONEXISTENT, name);
}
std::vector<token_t *> ftokens;
lerr_t lerr = tokenise_buffer(source.value(), ftokens);
if (lerr.type != lerr_type_t::OK)
{
VCLEAR(new_tokens);
return ERR(pp_err_t(pp_err_type_t::FILE_PARSE_ERROR, name, lerr));
VCLEAR(vec_out);
return pp_err_t(pp_err_type_t::FILE_PARSE_ERROR, name, lerr);
}
new_tokens.insert(new_tokens.end(), ftokens.begin(), ftokens.end());
vec_out.insert(vec_out.end(), ftokens.begin(), ftokens.end());
++i;
}
else
new_tokens.push_back(new token_t{*t});
vec_out.push_back(new token_t{*t});
}
return VAL(new_tokens);
return pp_err_t();
}
struct const_t
@@ -102,8 +71,8 @@ struct const_t
size_t start, end;
};
pair<vector<token_t *>, pp_err_t>
preprocess_const_blocks(vector<token_t *> const &tokens)
pp_err_t preprocess_const_blocks(const vector<token_t *> &tokens,
vector<token_t *> &vec_out)
{
std::unordered_map<string_view, const_t> blocks;
for (size_t i = 0; i < tokens.size(); ++i)
@@ -132,7 +101,7 @@ preprocess_const_blocks(vector<token_t *> const &tokens)
continue;
if (i == tokens.size())
return ERR(pp_err_t{pp_err_type_t::EXPECTED_END});
return pp_err_t{pp_err_type_t::EXPECTED_END};
block_end = i;
@@ -141,12 +110,11 @@ preprocess_const_blocks(vector<token_t *> const &tokens)
}
}
vector<token_t *> new_tokens;
if (blocks.size() == 0)
{
// Just construct a new vector and carry on
for (token_t *token : tokens)
new_tokens.push_back(new token_t{*token});
vec_out.push_back(new token_t{*token});
}
else
{
@@ -163,22 +131,52 @@ preprocess_const_blocks(vector<token_t *> const &tokens)
auto it = blocks.find(token->content);
if (it == blocks.end())
{
VCLEAR(new_tokens);
return ERR(pp_err_t(pp_err_type_t::UNKNOWN_NAME, token));
VCLEAR(vec_out);
return pp_err_t(pp_err_type_t::UNKNOWN_NAME, token);
}
const_t block = it->second;
for (size_t i = block.start; i < block.end; ++i)
new_tokens.push_back(new token_t{*tokens[i]});
vec_out.push_back(new token_t{*tokens[i]});
}
else
new_tokens.push_back(new token_t{*token});
vec_out.push_back(new token_t{*token});
}
}
return VAL(new_tokens);
return pp_err_t();
}
pp_err_t preprocesser(const vector<token_t *> &tokens,
vector<token_t *> &vec_out)
{
vector<token_t *> use_block_tokens;
pp_err_t pperr = preprocess_use_blocks(tokens, use_block_tokens);
if (pperr.type != pp_err_type_t::OK)
{
vec_out = tokens;
return pperr;
}
vector<token_t *> const_block_tokens;
pperr = preprocess_const_blocks(use_block_tokens, const_block_tokens);
if (pperr.type != pp_err_type_t::OK)
{
VCLEAR(tokens);
vec_out = use_block_tokens;
return pperr;
}
VCLEAR(use_block_tokens);
vec_out = const_block_tokens;
return pp_err_t{pp_err_type_t::OK};
}
// TODO: Implement this
pp_err_t preprocess_macro_blocks(const vector<token_t *> &,
vector<token_t *> &);
std::ostream &operator<<(std::ostream &os, pp_err_t &err)
{
os << "PREPROCESSING_";
@@ -196,7 +194,7 @@ std::ostream &operator<<(std::ostream &os, pp_err_t &err)
return os << "FILE_NONEXISTENT";
case FILE_PARSE_ERROR:
return os << "FILE_PARSE_ERROR -> \n\t[" << err.reference->content
<< "]: " << err.lerr;
<< "]:" << err.lerr;
case UNKNOWN_NAME:
return os << "UNKNOWN_NAME";
}

10
asm/preprocesser.hpp
View File

@@ -44,14 +44,4 @@ std::ostream &operator<<(std::ostream &, pp_err_t &);
pp_err_t preprocesser(const std::vector<token_t *> &, std::vector<token_t *> &);
std::pair<std::vector<token_t *>, pp_err_t>
preprocess_const_blocks(const std::vector<token_t *> &);
std::pair<std::vector<token_t *>, pp_err_t>
preprocess_use_blocks(const std::vector<token_t *> &);
// TODO: Implement this
std::pair<std::vector<token_t *>, pp_err_t>
preprocess_macro_blocks(const std::vector<token_t *> &);
#endif