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restructured tracking of initializations of globals for script compilation

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This commit is contained in:
Vern Paxson 2022-09-29 15:08:53 -07:00
parent 0d5c669c1c
commit 1af905a14f
5 changed files with 80 additions and 32 deletions
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41
src/script_opt/IDOptInfo.h
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@ -105,6 +105,24 @@ protected:
ExprPtr def_expr;
};
// Class tracking information associated with a (global) identifier's
// (re-)initialization.
class IDInitInfo
{
public:
IDInitInfo(const ID* _id, ExprPtr _init, InitClass _ic) : id(_id), init(_init), ic(_ic) { }
const ID* Id() const { return id; }
const ExprPtr& Init() const { return init; }
InitClass IC() const { return ic; }
private:
const ID* id;
ExprPtr init;
InitClass ic;
};
// Class tracking optimization information associated with identifiers.
class IDOptInfo
@ -118,11 +136,19 @@ public:
void Clear();
// Used to track expressions employed when explicitly initializing
// the identifier. These are needed by compile-to-C++ script
// optimization. They're not used by ZAM optimization.
void AddInitExpr(ExprPtr init_expr);
// the (global) identifier. These are needed by compile-to-C++ script
// optimization, and for tracking variable usage. An initialization
// class other than INIT_NONE indicates that initialization should
// be done with the ExprPtr form of ID::SetVal.
void AddInitExpr(ExprPtr init_expr, InitClass ic = INIT_NONE);
// Returns the initialization expressions for this identifier.
const std::vector<ExprPtr>& GetInitExprs() const { return init_exprs; }
// Returns a list of the initialization expressions seen for all
// globals, ordered by when they were processed.
static auto& GetGlobalInitExprs() { return global_init_exprs; }
// Associated constant expression, if any. This is only set
// for identifiers that are aliases for a constant (i.e., there
// are no other assignments to them).
@ -224,6 +250,9 @@ private:
// one of the earlier instances rather than the last one.
std::vector<ExprPtr> init_exprs;
// Tracks initializations of globals in the order they're seen.
static std::vector<IDInitInfo> global_init_exprs;
// If non-nil, a constant that this identifier always holds
// once initially defined.
const ConstExpr* const_expr = nullptr;
@ -256,8 +285,12 @@ private:
// Whether the identifier is a temporary variable.
bool is_temp = false;
// Only needed for debugging purposes.
// Associated identifier, to enable tracking of initialization
// expressions for globals (for C++ compilation), and for debugging
// output.
const ID* my_id;
// Only needed for debugging purposes.
bool tracing = false;
// Track whether we've already generated usage errors.