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- use the expression evaluation capabilities of the compiler backend to resolve constants in actor defaults.

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This is the first step to get rid of Simplify and all the baggage it depends on.
This commit is contained in:
Christoph Oelckers 2017-01-22 22:19:32 +01:00
parent f9f5e45824
commit 4c93e2baa3
1 changed files with 40 additions and 13 deletions
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53
src/scripting/zscript/zcc_compile.cpp
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@ -1765,6 +1765,27 @@ const char *ZCCCompiler::GetString(ZCC_Expression *expr, bool silent)
}
}
static int GetIntConst(FxExpression *ex, FCompileContext &ctx)
{
ex = new FxIntCast(ex, false);
ex = ex->Resolve(ctx);
return ex ? static_cast<FxConstant*>(ex)->GetValue().GetInt() : 0;
}
static double GetFloatConst(FxExpression *ex, FCompileContext &ctx)
{
ex = new FxFloatCast(ex);
ex = ex->Resolve(ctx);
return ex ? static_cast<FxConstant*>(ex)->GetValue().GetFloat() : 0;
}
static FString GetStringConst(FxExpression *ex, FCompileContext &ctx)
{
ex = new FxStringCast(ex);
ex = ex->Resolve(ctx);
return static_cast<FxConstant*>(ex)->GetValue().GetString();
}
//==========================================================================
//
// Parses an actor property's parameters and calls the handler
@ -1787,16 +1808,22 @@ void ZCCCompiler::DispatchProperty(FPropertyInfo *prop, ZCC_PropertyStmt *proper
Error(property, "%s: arguments missing", prop->name);
return;
}
property->Values = Simplify(property->Values, &bag.Info->Symbols, true); // need to do this before the loop so that we can find the head node again.
const char * p = prop->params;
auto exp = property->Values;
FCompileContext ctx(bag.Info, false);
while (true)
{
FPropParam conv;
FPropParam pref;
if (exp->NodeType != AST_ExprConstant)
FxExpression *ex = ConvertNode(exp);
ex = ex->Resolve(ctx);
if (ex == nullptr)
{
return;
}
else if (!ex->isConstant())
{
// If we get TypeError, there has already been a message from deeper down so do not print another one.
if (exp->Type != TypeError) Error(exp, "%s: non-constant parameter", prop->name);
@ -1809,7 +1836,7 @@ void ZCCCompiler::DispatchProperty(FPropertyInfo *prop, ZCC_PropertyStmt *proper
{
case 'X': // Expression in parentheses or number. We only support the constant here. The function will have to be handled by a separate property to get past the parser.
conv.i = GetInt(exp);
conv.i = GetIntConst(ex, ctx);
params.Push(conv);
conv.exp = nullptr;
break;
@ -1817,15 +1844,15 @@ void ZCCCompiler::DispatchProperty(FPropertyInfo *prop, ZCC_PropertyStmt *proper
case 'I':
case 'M': // special case for morph styles in DECORATE . This expression-aware parser will not need this.
case 'N': // special case for thing activations in DECORATE. This expression-aware parser will not need this.
conv.i = GetInt(exp);
conv.i = GetIntConst(ex, ctx);
break;
case 'F':
conv.d = GetDouble(exp);
conv.d = GetFloatConst(ex, ctx);
break;
case 'Z': // an optional string. Does not allow any numeric value.
if (!GetString(exp, true))
if (ex->ValueType != TypeString)
{
// apply this expression to the next argument on the list.
params.Push(conv);
@ -1833,21 +1860,21 @@ void ZCCCompiler::DispatchProperty(FPropertyInfo *prop, ZCC_PropertyStmt *proper
p++;
continue;
}
conv.s = GetString(exp);
conv.s = GetStringConst(ex, ctx);
break;
case 'C': // this parser accepts colors only in string form.
pref.i = 1;
case 'S':
case 'T': // a filtered string (ZScript only parses filtered strings so there's nothing to do here.)
conv.s = GetString(exp);
conv.s = GetStringConst(ex, ctx);
break;
case 'L': // Either a number or a list of strings
if (!GetString(exp, true))
if (ex->ValueType != TypeString)
{
pref.i = 0;
conv.i = GetInt(exp);
conv.i = GetIntConst(ex, ctx);
}
else
{
@ -1857,13 +1884,13 @@ void ZCCCompiler::DispatchProperty(FPropertyInfo *prop, ZCC_PropertyStmt *proper
do
{
conv.s = GetString(exp);
conv.s = GetStringConst(ex, ctx);
if (conv.s != nullptr)
{
params.Push(conv);
params[0].i++;
}
exp = Simplify(static_cast<ZCC_Expression *>(exp->SiblingNext), &bag.Info->Symbols, true);
exp = static_cast<ZCC_Expression *>(exp->SiblingNext);
} while (exp != property->Values);
goto endofparm;
}
@ -1881,7 +1908,7 @@ void ZCCCompiler::DispatchProperty(FPropertyInfo *prop, ZCC_PropertyStmt *proper
}
params.Push(conv);
params[0].i++;
exp = Simplify(static_cast<ZCC_Expression *>(exp->SiblingNext), &bag.Info->Symbols, true);
exp = static_cast<ZCC_Expression *>(exp->SiblingNext);
endofparm:
p++;
// Skip the DECORATE 'no comma' marker