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C API: add (un)initialized value checks

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José Luis Lafuente 2024-04-20 22:09:32 +02:00
parent 9d7dee4a8f
commit ccad6e94e2
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3 changed files with 128 additions and 24 deletions
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46
src/libexpr-c/nix_api_value.cc
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@ -20,7 +20,7 @@
# include "gc_cpp.h"
#endif
// Helper function to throw an exception if value is null
// Helper function to throw an exception if value is null or in an invalid state
static const nix::Value & check_value_not_null(const Value * value)
{
if (!value) {
@ -37,6 +37,20 @@ static nix::Value & check_value_not_null(Value * value)
return *((nix::Value *) value);
}
static void check_value_initialized(const nix::Value & value)
{
if (!value.isValid()) {
throw std::runtime_error("Uninitialized Value");
}
}
static void check_value_uninitialized(const nix::Value & value)
{
if (value.isValid()) {
throw std::runtime_error("Value already initialized. Variables are immutable");
}
}
/**
* Helper function to convert calls from nix into C API.
*
@ -112,6 +126,7 @@ ValueType nix_get_type(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
using namespace nix;
switch (v.type()) {
case nThunk:
@ -148,6 +163,7 @@ const char * nix_get_typename(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
auto s = nix::showType(v);
return strdup(s.c_str());
}
@ -160,6 +176,7 @@ bool nix_get_bool(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nBool);
return v.boolean();
}
@ -172,6 +189,7 @@ nix_err nix_get_string(nix_c_context * context, const Value * value, nix_get_str
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nString);
call_nix_get_string_callback(v.c_str(), callback, user_data);
}
@ -184,6 +202,7 @@ const char * nix_get_path_string(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nPath);
// NOTE (from @yorickvP)
// v._path.path should work but may not be how Eelco intended it.
@ -203,6 +222,7 @@ unsigned int nix_get_list_size(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nList);
return v.listSize();
}
@ -215,6 +235,7 @@ unsigned int nix_get_attrs_size(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nAttrs);
return v.attrs()->size();
}
@ -227,6 +248,7 @@ double nix_get_float(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nFloat);
return v.fpoint();
}
@ -239,6 +261,7 @@ int64_t nix_get_int(nix_c_context * context, const Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nInt);
return v.integer();
}
@ -251,6 +274,7 @@ ExternalValue * nix_get_external(nix_c_context * context, Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nExternal);
return (ExternalValue *) v.external();
}
@ -263,6 +287,7 @@ Value * nix_get_list_byidx(nix_c_context * context, const Value * value, EvalSta
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nList);
auto * p = v.listElems()[ix];
nix_gc_incref(nullptr, p);
@ -279,6 +304,7 @@ Value * nix_get_attr_byname(nix_c_context * context, const Value * value, EvalSt
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nAttrs);
nix::Symbol s = state->state.symbols.create(name);
auto attr = v.attrs()->get(s);
@ -299,6 +325,7 @@ bool nix_has_attr_byname(nix_c_context * context, const Value * value, EvalState
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
assert(v.type() == nix::nAttrs);
nix::Symbol s = state->state.symbols.create(name);
auto attr = v.attrs()->get(s);
@ -316,6 +343,7 @@ nix_get_attr_byidx(nix_c_context * context, const Value * value, EvalState * sta
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
const nix::Attr & a = (*v.attrs())[i];
*name = ((const std::string &) (state->state.symbols[a.name])).c_str();
nix_gc_incref(nullptr, a.value);
@ -331,6 +359,7 @@ const char * nix_get_attr_name_byidx(nix_c_context * context, const Value * valu
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
const nix::Attr & a = (*v.attrs())[i];
return ((const std::string &) (state->state.symbols[a.name])).c_str();
}
@ -343,6 +372,7 @@ nix_err nix_init_bool(nix_c_context * context, Value * value, bool b)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkBool(b);
}
NIXC_CATCH_ERRS
@ -355,6 +385,7 @@ nix_err nix_init_string(nix_c_context * context, Value * value, const char * str
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkString(std::string_view(str));
}
NIXC_CATCH_ERRS
@ -366,6 +397,7 @@ nix_err nix_init_path_string(nix_c_context * context, EvalState * s, Value * val
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkPath(s->state.rootPath(nix::CanonPath(str)));
}
NIXC_CATCH_ERRS
@ -377,6 +409,7 @@ nix_err nix_init_float(nix_c_context * context, Value * value, double d)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkFloat(d);
}
NIXC_CATCH_ERRS
@ -388,6 +421,7 @@ nix_err nix_init_int(nix_c_context * context, Value * value, int64_t i)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkInt(i);
}
NIXC_CATCH_ERRS
@ -399,6 +433,7 @@ nix_err nix_init_null(nix_c_context * context, Value * value)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkNull();
}
NIXC_CATCH_ERRS
@ -423,6 +458,7 @@ nix_err nix_init_external(nix_c_context * context, Value * value, ExternalValue
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
auto r = (nix::ExternalValueBase *) val;
v.mkExternal(r);
}
@ -450,6 +486,7 @@ nix_err nix_list_builder_insert(nix_c_context * context, ListBuilder * list_buil
context->last_err_code = NIX_OK;
try {
auto & e = check_value_not_null(value);
check_value_initialized(e);
list_builder->builder[index] = &e;
}
NIXC_CATCH_ERRS
@ -470,6 +507,7 @@ nix_err nix_make_list(nix_c_context * context, ListBuilder * list_builder, Value
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkList(list_builder->builder);
}
NIXC_CATCH_ERRS
@ -481,6 +519,7 @@ nix_err nix_init_primop(nix_c_context * context, Value * value, PrimOp * p)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkPrimOp((nix::PrimOp *) p);
}
NIXC_CATCH_ERRS
@ -492,7 +531,9 @@ nix_err nix_copy_value(nix_c_context * context, Value * value, Value * source)
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
auto & s = check_value_not_null(source);
check_value_initialized(s);
v = s;
}
NIXC_CATCH_ERRS
@ -504,6 +545,7 @@ nix_err nix_make_attrs(nix_c_context * context, Value * value, BindingsBuilder *
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_uninitialized(v);
v.mkAttrs(b->builder);
}
NIXC_CATCH_ERRS
@ -530,6 +572,7 @@ nix_err nix_bindings_builder_insert(nix_c_context * context, BindingsBuilder * b
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
nix::Symbol s = bb->builder.state.symbols.create(name);
bb->builder.insert(s, &v);
}
@ -551,6 +594,7 @@ nix_realised_string * nix_string_realise(nix_c_context * context, EvalState * st
context->last_err_code = NIX_OK;
try {
auto & v = check_value_not_null(value);
check_value_initialized(v);
nix::NixStringContext stringContext;
auto rawStr = state->state.coerceToString(nix::noPos, v, stringContext, "while realising a string").toOwned();
nix::StorePathSet storePaths;