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xo-exprssion: + Expression::xform_layer()

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This commit is contained in:
Roland Conybeare 2024-07-03 14:11:02 -04:00
commit 1d99757bca
8 changed files with 72 additions and 4 deletions
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33
src/expression/Lambda.cpp
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@ -4,6 +4,7 @@
#include "xo/reflect/TypeDescr.hpp"
#include "xo/reflect/function/FunctionTdx.hpp"
#include "xo/indentlog/print/vector.hpp"
#include <map>
namespace xo {
using xo::reflect::TypeDescrBase;
@ -25,10 +26,12 @@ namespace xo {
**/
std::vector<TypeDescr> arg_td_v;
arg_td_v.reserve(argv.size());
{
arg_td_v.reserve(argv.size());
for (const auto & arg : argv) {
arg_td_v.push_back(arg->valuetype());
for (const auto & arg : argv) {
arg_td_v.push_back(arg->valuetype());
}
}
auto function_info
@ -85,6 +88,30 @@ namespace xo {
}
ss << ")";
/* regularize local_env+body: make sure exactly one instance
* (i.e. with object identity) of a Variable appears
* within one layer of a lambda body.
*
* Here 'layer' means excluding appearance in any nested lambdas
* (i.e. whether or not such appearance would resolve to the same
* memory location).
*
* Motivation is to unify Variables that would use the same
* binding_path to resolve their runtime location.
*/
{
std::map<std::string, rp<Variable>> var_map;
for (const auto & arg : local_env_->argv()) {
/* each arg name can appear at most once
* in a particular lambda's parameter list
*/
assert(var_map.find(arg->name()) == var_map.end());
var_map[arg->name()] = arg;
}
}
this->type_str_ = ss.str();
this->free_var_set_ = this->calc_free_variables();