mirror of
https://github.com/NixOS/nix
synced 2025-07-07 18:31:49 +02:00
libexpr: Factor out Payload union to a default implementation of ValueStorage
This factors out most of the value representation into a mixin class. `finishValue` is now gone for good and replaced with a simple template function `setStorage` which derives the type information/disriminator from the type of the argument. Likewise, reading of the value goes through function template `getStorage`. An empty type `Null` is introduced to make the bijection InternalType <-> C++ type complete.
This commit is contained in:
Sergei Zimmerman
parent
810455f1b8
commit
c39cc00404
3 changed files with 258 additions and 164 deletions
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@ -502,7 +502,7 @@ void EvalState::addConstant(const std::string & name, Value * v, Constant info)
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/* Install value the base environment. */
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staticBaseEnv->vars.emplace_back(symbols.create(name), baseEnvDispl);
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baseEnv.values[baseEnvDispl++] = v;
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getBuiltins().payload.attrs->push_back(Attr(symbols.create(name2), v));
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const_cast<Bindings *>(getBuiltins().attrs())->push_back(Attr(symbols.create(name2), v));
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}
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}
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@ -540,7 +540,7 @@ const PrimOp * Value::primOpAppPrimOp() const
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void Value::mkPrimOp(PrimOp * p)
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{
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p->check();
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finishValue(tPrimOp, { .primOp = p });
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setStorage(p);
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}
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@ -572,7 +572,7 @@ Value * EvalState::addPrimOp(PrimOp && primOp)
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else {
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staticBaseEnv->vars.emplace_back(envName, baseEnvDispl);
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baseEnv.values[baseEnvDispl++] = v;
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getBuiltins().payload.attrs->push_back(Attr(symbols.create(primOp.name), v));
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const_cast<Bindings *>(getBuiltins().attrs())->push_back(Attr(symbols.create(primOp.name), v));
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}
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return v;
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@ -3,6 +3,7 @@
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#include <cassert>
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#include <span>
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#include <type_traits>
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#include "nix/expr/eval-gc.hh"
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#include "nix/expr/value/context.hh"
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@ -170,24 +171,205 @@ public:
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friend struct Value;
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};
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struct Value
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namespace detail {
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/**
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* Implementation mixin class for defining the public types
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* In can be inherited from by the actual ValueStorage implementations
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* for free due to Empty Base Class Optimization (EBCO).
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*/
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struct ValueBase
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{
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/**
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* Strings in the evaluator carry a so-called `context` which
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* is a list of strings representing store paths. This is to
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* allow users to write things like
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*
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* "--with-freetype2-library=" + freetype + "/lib"
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*
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* where `freetype` is a derivation (or a source to be copied
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* to the store). If we just concatenated the strings without
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* keeping track of the referenced store paths, then if the
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* string is used as a derivation attribute, the derivation
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* will not have the correct dependencies in its inputDrvs and
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* inputSrcs.
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* The semantics of the context is as follows: when a string
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* with context C is used as a derivation attribute, then the
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* derivations in C will be added to the inputDrvs of the
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* derivation, and the other store paths in C will be added to
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* the inputSrcs of the derivations.
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* For canonicity, the store paths should be in sorted order.
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*/
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struct StringWithContext
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{
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const char * c_str;
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const char ** context; // must be in sorted order
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};
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struct Path
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{
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SourceAccessor * accessor;
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const char * path;
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};
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struct Null
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{};
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struct ClosureThunk
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{
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Env * env;
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Expr * expr;
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};
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struct FunctionApplicationThunk
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{
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Value *left, *right;
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};
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/**
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* Like FunctionApplicationThunk, but must be a distinct type in order to
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* resolve overloads to `tPrimOpApp` instead of `tApp`.
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* This type helps with the efficient implementation of arity>=2 primop calls.
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*/
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struct PrimOpApplicationThunk
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{
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Value *left, *right;
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};
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struct Lambda
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{
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Env * env;
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ExprLambda * fun;
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};
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using SmallList = std::array<Value *, 2>;
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struct List
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{
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size_t size;
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Value * const * elems;
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};
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};
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template<typename T>
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struct PayloadTypeToInternalType
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{};
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/**
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* All stored types must be distinct (not type aliases) for the purposes of
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* overload resolution in setStorage. This ensures there's a bijection from
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* InternalType <-> C++ type.
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*/
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#define NIX_VALUE_STORAGE_FOR_EACH_FIELD(MACRO) \
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MACRO(NixInt, integer, tInt) \
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MACRO(bool, boolean, tBool) \
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MACRO(ValueBase::StringWithContext, string, tString) \
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MACRO(ValueBase::Path, path, tPath) \
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MACRO(ValueBase::Null, null_, tNull) \
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MACRO(Bindings *, attrs, tAttrs) \
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MACRO(ValueBase::List, bigList, tListN) \
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MACRO(ValueBase::SmallList, smallList, tListSmall) \
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MACRO(ValueBase::ClosureThunk, thunk, tThunk) \
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MACRO(ValueBase::FunctionApplicationThunk, app, tApp) \
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MACRO(ValueBase::Lambda, lambda, tLambda) \
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MACRO(PrimOp *, primOp, tPrimOp) \
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MACRO(ValueBase::PrimOpApplicationThunk, primOpApp, tPrimOpApp) \
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MACRO(ExternalValueBase *, external, tExternal) \
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MACRO(NixFloat, fpoint, tFloat)
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#define NIX_VALUE_PAYLOAD_TYPE(T, FIELD_NAME, DISCRIMINATOR) \
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template<> \
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struct PayloadTypeToInternalType<T> \
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{ \
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static constexpr InternalType value = DISCRIMINATOR; \
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};
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NIX_VALUE_STORAGE_FOR_EACH_FIELD(NIX_VALUE_PAYLOAD_TYPE)
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#undef NIX_VALUE_PAYLOAD_TYPE
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template<typename T>
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inline constexpr InternalType payloadTypeToInternalType = PayloadTypeToInternalType<T>::value;
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}
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/**
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* Discriminated union of types stored in the value.
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* The union discriminator is @ref InternalType enumeration.
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*
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* This class can be specialized with a non-type template parameter
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* of pointer size for more optimized data layouts on when pointer alignment
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* bits can be used for storing the discriminator.
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*
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* All specializations of this type need to implement getStorage, setStorage and
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* getInternalType methods.
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*/
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template<std::size_t ptrSize>
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class ValueStorage : public detail::ValueBase
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{
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protected:
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using Payload = union
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{
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#define NIX_VALUE_STORAGE_DEFINE_FIELD(T, FIELD_NAME, DISCRIMINATOR) T FIELD_NAME;
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NIX_VALUE_STORAGE_FOR_EACH_FIELD(NIX_VALUE_STORAGE_DEFINE_FIELD)
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#undef NIX_VALUE_STORAGE_DEFINE_FIELD
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};
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Payload payload;
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private:
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InternalType internalType = tUninitialized;
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public:
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#define NIX_VALUE_STORAGE_GET_IMPL(K, FIELD_NAME, DISCRIMINATOR) \
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void getStorage(K & val) const noexcept \
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{ \
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assert(internalType == DISCRIMINATOR); \
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val = payload.FIELD_NAME; \
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}
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#define NIX_VALUE_STORAGE_SET_IMPL(K, FIELD_NAME, DISCRIMINATOR) \
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void setStorage(K val) noexcept \
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{ \
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payload.FIELD_NAME = val; \
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internalType = DISCRIMINATOR; \
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}
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NIX_VALUE_STORAGE_FOR_EACH_FIELD(NIX_VALUE_STORAGE_GET_IMPL)
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NIX_VALUE_STORAGE_FOR_EACH_FIELD(NIX_VALUE_STORAGE_SET_IMPL)
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#undef NIX_VALUE_STORAGE_SET_IMPL
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#undef NIX_VALUE_STORAGE_GET_IMPL
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#undef NIX_VALUE_STORAGE_FOR_EACH_FIELD
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/** Get internal type currently occupying the storage. */
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InternalType getInternalType() const noexcept
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{
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return internalType;
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}
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};
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/** Check if currently stored value type is either of Vs. */
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template<InternalType... Vs>
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struct Value : public ValueStorage<sizeof(void *)>
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{
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friend std::string showType(const Value & v);
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template<InternalType... discriminator>
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bool isa() const noexcept
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{
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return ((getInternalType() == Vs) || ...);
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return ((getInternalType() == discriminator) || ...);
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}
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friend std::string showType(const Value & v);
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template<typename T>
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T getStorage() const noexcept
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{
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if (getInternalType() != detail::payloadTypeToInternalType<T>) [[unlikely]]
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unreachable();
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T out;
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ValueStorage::getStorage(out);
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return out;
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}
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public:
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@ -227,84 +409,6 @@ public:
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return isa<tPrimOpApp>();
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};
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/**
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* Strings in the evaluator carry a so-called `context` which
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* is a list of strings representing store paths. This is to
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* allow users to write things like
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*
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* "--with-freetype2-library=" + freetype + "/lib"
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*
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* where `freetype` is a derivation (or a source to be copied
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* to the store). If we just concatenated the strings without
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* keeping track of the referenced store paths, then if the
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* string is used as a derivation attribute, the derivation
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* will not have the correct dependencies in its inputDrvs and
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* inputSrcs.
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* The semantics of the context is as follows: when a string
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* with context C is used as a derivation attribute, then the
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* derivations in C will be added to the inputDrvs of the
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* derivation, and the other store paths in C will be added to
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* the inputSrcs of the derivations.
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* For canonicity, the store paths should be in sorted order.
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*/
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struct StringWithContext
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{
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const char * c_str;
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const char ** context; // must be in sorted order
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};
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struct Path
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{
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SourceAccessor * accessor;
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const char * path;
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};
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struct ClosureThunk
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{
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Env * env;
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Expr * expr;
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};
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struct FunctionApplicationThunk
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{
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Value *left, *right;
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};
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struct Lambda
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{
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Env * env;
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ExprLambda * fun;
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};
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using Payload = union
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{
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NixInt integer;
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bool boolean;
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StringWithContext string;
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Path path;
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Bindings * attrs;
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struct
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{
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size_t size;
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Value * const * elems;
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} bigList;
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Value * smallList[2];
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ClosureThunk thunk;
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FunctionApplicationThunk app;
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Lambda lambda;
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PrimOp * primOp;
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FunctionApplicationThunk primOpApp;
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ExternalValueBase * external;
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NixFloat fpoint;
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};
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Payload payload;
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/**
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* Returns the normal type of a Value. This only returns nThunk if
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* the Value hasn't been forceValue'd
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@ -350,40 +454,34 @@ public:
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unreachable();
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}
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inline void finishValue(InternalType newType, Payload newPayload)
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{
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payload = newPayload;
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internalType = newType;
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}
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/**
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* A value becomes valid when it is initialized. We don't use this
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* in the evaluator; only in the bindings, where the slight extra
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* cost is warranted because of inexperienced callers.
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*/
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inline bool isValid() const
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inline bool isValid() const noexcept
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{
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return !isa<tUninitialized>();
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}
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inline void mkInt(NixInt::Inner n)
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inline void mkInt(NixInt::Inner n) noexcept
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{
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mkInt(NixInt{n});
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}
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inline void mkInt(NixInt n)
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inline void mkInt(NixInt n) noexcept
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{
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finishValue(tInt, {.integer = n});
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setStorage(NixInt{n});
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}
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inline void mkBool(bool b)
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inline void mkBool(bool b) noexcept
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{
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finishValue(tBool, {.boolean = b});
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setStorage(b);
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}
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inline void mkString(const char * s, const char ** context = 0)
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inline void mkString(const char * s, const char ** context = 0) noexcept
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{
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finishValue(tString, {.string = {.c_str = s, .context = context}});
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setStorage(StringWithContext{.c_str = s, .context = context});
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}
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void mkString(std::string_view s);
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@ -395,55 +493,55 @@ public:
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void mkPath(const SourcePath & path);
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void mkPath(std::string_view path);
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inline void mkPath(SourceAccessor * accessor, const char * path)
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inline void mkPath(SourceAccessor * accessor, const char * path) noexcept
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{
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finishValue(tPath, {.path = {.accessor = accessor, .path = path}});
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setStorage(Path{.accessor = accessor, .path = path});
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}
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inline void mkNull()
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inline void mkNull() noexcept
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{
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finishValue(tNull, {});
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setStorage(Null{});
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}
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inline void mkAttrs(Bindings * a)
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inline void mkAttrs(Bindings * a) noexcept
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{
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finishValue(tAttrs, {.attrs = a});
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setStorage(a);
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}
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Value & mkAttrs(BindingsBuilder & bindings);
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void mkList(const ListBuilder & builder)
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void mkList(const ListBuilder & builder) noexcept
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{
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if (builder.size == 1)
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finishValue(tListSmall, {.smallList = {builder.inlineElems[0], nullptr}});
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setStorage(std::array<Value *, 2>{builder.inlineElems[0], nullptr});
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else if (builder.size == 2)
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finishValue(tListSmall, {.smallList = {builder.inlineElems[0], builder.inlineElems[1]}});
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setStorage(std::array<Value *, 2>{builder.inlineElems[0], builder.inlineElems[1]});
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else
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finishValue(tListN, {.bigList = {.size = builder.size, .elems = builder.elems}});
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setStorage(List{.size = builder.size, .elems = builder.elems});
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}
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inline void mkThunk(Env * e, Expr * ex)
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inline void mkThunk(Env * e, Expr * ex) noexcept
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{
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finishValue(tThunk, {.thunk = {.env = e, .expr = ex}});
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setStorage(ClosureThunk{.env = e, .expr = ex});
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}
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inline void mkApp(Value * l, Value * r)
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inline void mkApp(Value * l, Value * r) noexcept
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{
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finishValue(tApp, {.app = {.left = l, .right = r}});
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setStorage(FunctionApplicationThunk{.left = l, .right = r});
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}
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inline void mkLambda(Env * e, ExprLambda * f)
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inline void mkLambda(Env * e, ExprLambda * f) noexcept
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{
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finishValue(tLambda, {.lambda = {.env = e, .fun = f}});
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setStorage(Lambda{.env = e, .fun = f});
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}
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inline void mkBlackhole();
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void mkPrimOp(PrimOp * p);
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inline void mkPrimOpApp(Value * l, Value * r)
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inline void mkPrimOpApp(Value * l, Value * r) noexcept
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{
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finishValue(tPrimOpApp, {.primOpApp = {.left = l, .right = r}});
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setStorage(PrimOpApplicationThunk{.left = l, .right = r});
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}
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/**
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@ -451,35 +549,35 @@ public:
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*/
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const PrimOp * primOpAppPrimOp() const;
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inline void mkExternal(ExternalValueBase * e)
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inline void mkExternal(ExternalValueBase * e) noexcept
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{
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finishValue(tExternal, {.external = e});
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setStorage(e);
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}
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inline void mkFloat(NixFloat n)
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inline void mkFloat(NixFloat n) noexcept
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{
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finishValue(tFloat, {.fpoint = n});
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setStorage(n);
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}
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bool isList() const
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bool isList() const noexcept
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{
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return isa<tListSmall, tListN>();
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}
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std::span<Value * const> listItems() const
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std::span<Value * const> listItems() const noexcept
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{
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assert(isList());
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return std::span<Value * const>(listElems(), listSize());
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}
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Value * const * listElems() const
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Value * const * listElems() const noexcept
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{
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return isa<tListSmall>() ? payload.smallList : payload.bigList.elems;
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return isa<tListSmall>() ? payload.smallList.data() : getStorage<List>().elems;
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}
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size_t listSize() const
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size_t listSize() const noexcept
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{
|
||||
return isa<tListSmall>() ? (payload.smallList[1] == nullptr ? 1 : 2) : payload.bigList.size;
|
||||
return isa<tListSmall>() ? (getStorage<SmallList>()[1] == nullptr ? 1 : 2) : getStorage<List>().size;
|
||||
}
|
||||
|
||||
PosIdx determinePos(const PosIdx pos) const;
|
||||
|
|
@ -493,85 +591,82 @@ public:
|
|||
|
||||
SourcePath path() const
|
||||
{
|
||||
assert(isa<tPath>());
|
||||
return SourcePath(ref(pathAccessor()->shared_from_this()), CanonPath(CanonPath::unchecked_t(), pathStr()));
|
||||
}
|
||||
|
||||
std::string_view string_view() const
|
||||
std::string_view string_view() const noexcept
|
||||
{
|
||||
assert(isa<tString>());
|
||||
return std::string_view(payload.string.c_str);
|
||||
return std::string_view(getStorage<StringWithContext>().c_str);
|
||||
}
|
||||
|
||||
const char * c_str() const
|
||||
const char * c_str() const noexcept
|
||||
{
|
||||
assert(isa<tString>());
|
||||
return payload.string.c_str;
|
||||
return getStorage<StringWithContext>().c_str;
|
||||
}
|
||||
|
||||
const char ** context() const
|
||||
const char ** context() const noexcept
|
||||
{
|
||||
return payload.string.context;
|
||||
return getStorage<StringWithContext>().context;
|
||||
}
|
||||
|
||||
ExternalValueBase * external() const
|
||||
ExternalValueBase * external() const noexcept
|
||||
{
|
||||
return payload.external;
|
||||
return getStorage<ExternalValueBase *>();
|
||||
}
|
||||
|
||||
const Bindings * attrs() const
|
||||
const Bindings * attrs() const noexcept
|
||||
{
|
||||
return payload.attrs;
|
||||
return getStorage<Bindings *>();
|
||||
}
|
||||
|
||||
const PrimOp * primOp() const
|
||||
const PrimOp * primOp() const noexcept
|
||||
{
|
||||
return payload.primOp;
|
||||
return getStorage<PrimOp *>();
|
||||
}
|
||||
|
||||
bool boolean() const
|
||||
bool boolean() const noexcept
|
||||
{
|
||||
return payload.boolean;
|
||||
return getStorage<bool>();
|
||||
}
|
||||
|
||||
NixInt integer() const
|
||||
NixInt integer() const noexcept
|
||||
{
|
||||
return payload.integer;
|
||||
return getStorage<NixInt>();
|
||||
}
|
||||
|
||||
NixFloat fpoint() const
|
||||
NixFloat fpoint() const noexcept
|
||||
{
|
||||
return payload.fpoint;
|
||||
return getStorage<NixFloat>();
|
||||
}
|
||||
|
||||
Lambda lambda() const
|
||||
Lambda lambda() const noexcept
|
||||
{
|
||||
return payload.lambda;
|
||||
return getStorage<Lambda>();
|
||||
}
|
||||
|
||||
ClosureThunk thunk() const
|
||||
ClosureThunk thunk() const noexcept
|
||||
{
|
||||
return payload.thunk;
|
||||
return getStorage<ClosureThunk>();
|
||||
}
|
||||
|
||||
FunctionApplicationThunk primOpApp() const
|
||||
PrimOpApplicationThunk primOpApp() const noexcept
|
||||
{
|
||||
return payload.primOpApp;
|
||||
return getStorage<PrimOpApplicationThunk>();
|
||||
}
|
||||
|
||||
FunctionApplicationThunk app() const
|
||||
FunctionApplicationThunk app() const noexcept
|
||||
{
|
||||
return payload.app;
|
||||
return getStorage<FunctionApplicationThunk>();
|
||||
}
|
||||
|
||||
const char * pathStr() const
|
||||
const char * pathStr() const noexcept
|
||||
{
|
||||
return payload.path.path;
|
||||
return getStorage<Path>().path;
|
||||
}
|
||||
|
||||
SourceAccessor * pathAccessor() const
|
||||
SourceAccessor * pathAccessor() const noexcept
|
||||
{
|
||||
return payload.path.accessor;
|
||||
return getStorage<Path>().accessor;
|
||||
}
|
||||
};
|
||||
|
||||
|
|
@ -579,7 +674,7 @@ extern ExprBlackHole eBlackHole;
|
|||
|
||||
bool Value::isBlackhole() const
|
||||
{
|
||||
return isa<tThunk>() && thunk().expr == (Expr *) &eBlackHole;
|
||||
return isThunk() && thunk().expr == (Expr *) &eBlackHole;
|
||||
}
|
||||
|
||||
void Value::mkBlackhole()
|
||||
|
|
@ -606,5 +701,4 @@ typedef std::shared_ptr<Value *> RootValue;
|
|||
RootValue allocRootValue(Value * v);
|
||||
|
||||
void forceNoNullByte(std::string_view s, std::function<Pos()> = nullptr);
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -5050,7 +5050,7 @@ void EvalState::createBaseEnv(const EvalSettings & evalSettings)
|
|||
|
||||
/* Now that we've added all primops, sort the `builtins' set,
|
||||
because attribute lookups expect it to be sorted. */
|
||||
getBuiltins().payload.attrs->sort();
|
||||
const_cast<Bindings *>(getBuiltins().attrs())->sort();
|
||||
|
||||
staticBaseEnv->sort();
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue