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SystemSubroutine.cpp
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SystemSubroutine.cpp
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//------------------------------------------------------------------------------
// SystemSubroutine.cpp
// System-defined subroutine handling
//
// SPDX-FileCopyrightText: Michael Popoloski
// SPDX-License-Identifier: MIT
//------------------------------------------------------------------------------
#include "slang/ast/SystemSubroutine.h"
#include "slang/ast/Compilation.h"
#include "slang/ast/EvalContext.h"
#include "slang/ast/Expression.h"
#include "slang/ast/symbols/VariableSymbols.h"
#include "slang/ast/types/Type.h"
#include "slang/diagnostics/ExpressionsDiags.h"
#include "slang/diagnostics/SysFuncsDiags.h"
namespace slang::ast {
using namespace syntax;
bool SystemSubroutine::allowEmptyArgument(size_t) const {
return false;
}
bool SystemSubroutine::allowClockingArgument(size_t) const {
return false;
}
bool SystemSubroutine::isArgUnevaluated(size_t) const {
return false;
}
const Expression& SystemSubroutine::bindArgument(size_t, const ASTContext& context,
const ExpressionSyntax& syntax,
const Args&) const {
return Expression::bind(syntax, context);
}
std::string_view SystemSubroutine::kindStr() const {
return kind == SubroutineKind::Task ? "task"sv : "function"sv;
}
bool SystemSubroutine::checkArgCount(const ASTContext& context, bool isMethod, const Args& args,
SourceRange callRange, size_t min, size_t max) const {
for (auto arg : args) {
if (arg->bad())
return false;
}
size_t provided = args.size();
if (isMethod) {
SLANG_ASSERT(provided);
provided--;
}
if (provided < min) {
context.addDiag(diag::TooFewArguments, callRange) << name << min << provided;
return false;
}
if (provided > max) {
context.addDiag(diag::TooManyArguments, args[max]->sourceRange) << name << max << provided;
return false;
}
return true;
}
ASTContext SystemSubroutine::unevaluatedContext(const ASTContext& sourceContext) {
ASTContext result = sourceContext;
result.flags &= ~ASTFlags::StaticInitializer;
return result;
}
// Wrapper around Expression::requireLValue that also registers the
// target symbol as being assigned.
bool SystemSubroutine::registerLValue(const Expression& expr, const ASTContext& context) {
if (!expr.requireLValue(context))
return false;
if (auto sym = expr.getSymbolReference())
context.getCompilation().noteReference(*sym, /* isLValue */ true);
return true;
}
const Type& SystemSubroutine::badArg(const ASTContext& context, const Expression& arg) const {
context.addDiag(diag::BadSystemSubroutineArg, arg.sourceRange) << *arg.type << kindStr();
return context.getCompilation().getErrorType();
}
bool SystemSubroutine::notConst(EvalContext& context, SourceRange range) const {
context.addDiag(diag::SysFuncNotConst, range) << name;
return false;
}
bool SystemSubroutine::noHierarchical(EvalContext& context, const Expression& expr) const {
if (expr.hasHierarchicalReference() &&
!context.getCompilation().hasFlag(CompilationFlags::AllowHierarchicalConst) &&
!context.flags.has(EvalFlags::IsScript)) {
context.addDiag(diag::SysFuncHierarchicalNotAllowed, expr.sourceRange) << name;
return false;
}
return true;
}
const Expression& SimpleSystemSubroutine::bindArgument(size_t argIndex, const ASTContext& context,
const ExpressionSyntax& syntax,
const Args& args) const {
if (isMethod)
argIndex--;
if (argIndex >= argTypes.size())
return SystemSubroutine::bindArgument(argIndex, context, syntax, args);
return Expression::bindArgument(*argTypes[argIndex], ArgumentDirection::In, {}, syntax,
context);
}
const Type& SimpleSystemSubroutine::checkArguments(const ASTContext& context, const Args& args,
SourceRange range, const Expression*) const {
auto& comp = context.getCompilation();
if (!checkArgCount(context, isMethod, args, range, requiredArgs, argTypes.size()))
return comp.getErrorType();
if (isFirstArgLValue && !args.empty() && !registerLValue(*args[0], context))
return comp.getErrorType();
return *returnType;
}
} // namespace slang::ast