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-rw-r--r--lib/AST/Interp/Context.cpp148
1 files changed, 148 insertions, 0 deletions
diff --git a/lib/AST/Interp/Context.cpp b/lib/AST/Interp/Context.cpp
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+++ b/lib/AST/Interp/Context.cpp
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+//===--- Context.cpp - Context for the constexpr VM -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Context.h"
+#include "ByteCodeEmitter.h"
+#include "ByteCodeExprGen.h"
+#include "ByteCodeStmtGen.h"
+#include "EvalEmitter.h"
+#include "Interp.h"
+#include "InterpFrame.h"
+#include "InterpStack.h"
+#include "PrimType.h"
+#include "Program.h"
+#include "clang/AST/Expr.h"
+
+using namespace clang;
+using namespace clang::interp;
+
+Context::Context(ASTContext &Ctx)
+ : Ctx(Ctx), ForceInterp(getLangOpts().ForceNewConstInterp),
+ P(new Program(*this)) {}
+
+Context::~Context() {}
+
+InterpResult Context::isPotentialConstantExpr(State &Parent,
+ const FunctionDecl *FD) {
+ Function *Func = P->getFunction(FD);
+ if (!Func) {
+ if (auto R = ByteCodeStmtGen<ByteCodeEmitter>(*this, *P).compileFunc(FD)) {
+ Func = *R;
+ } else if (ForceInterp) {
+ handleAllErrors(R.takeError(), [&Parent](ByteCodeGenError &Err) {
+ Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
+ });
+ return InterpResult::Fail;
+ } else {
+ consumeError(R.takeError());
+ return InterpResult::Bail;
+ }
+ }
+
+ if (!Func->isConstexpr())
+ return InterpResult::Fail;
+
+ APValue Dummy;
+ return Run(Parent, Func, Dummy);
+}
+
+InterpResult Context::evaluateAsRValue(State &Parent, const Expr *E,
+ APValue &Result) {
+ ByteCodeExprGen<EvalEmitter> C(*this, *P, Parent, Stk, Result);
+ return Check(Parent, C.interpretExpr(E));
+}
+
+InterpResult Context::evaluateAsInitializer(State &Parent, const VarDecl *VD,
+ APValue &Result) {
+ ByteCodeExprGen<EvalEmitter> C(*this, *P, Parent, Stk, Result);
+ return Check(Parent, C.interpretDecl(VD));
+}
+
+const LangOptions &Context::getLangOpts() const { return Ctx.getLangOpts(); }
+
+llvm::Optional<PrimType> Context::classify(QualType T) {
+ if (T->isReferenceType() || T->isPointerType()) {
+ return PT_Ptr;
+ }
+
+ if (T->isBooleanType())
+ return PT_Bool;
+
+ if (T->isSignedIntegerOrEnumerationType()) {
+ switch (Ctx.getIntWidth(T)) {
+ case 64:
+ return PT_Sint64;
+ case 32:
+ return PT_Sint32;
+ case 16:
+ return PT_Sint16;
+ case 8:
+ return PT_Sint8;
+ default:
+ return {};
+ }
+ }
+
+ if (T->isUnsignedIntegerOrEnumerationType()) {
+ switch (Ctx.getIntWidth(T)) {
+ case 64:
+ return PT_Uint64;
+ case 32:
+ return PT_Uint32;
+ case 16:
+ return PT_Uint16;
+ case 8:
+ return PT_Uint8;
+ default:
+ return {};
+ }
+ }
+
+ if (T->isNullPtrType())
+ return PT_Ptr;
+
+ if (auto *AT = dyn_cast<AtomicType>(T))
+ return classify(AT->getValueType());
+
+ return {};
+}
+
+unsigned Context::getCharBit() const {
+ return Ctx.getTargetInfo().getCharWidth();
+}
+
+InterpResult Context::Run(State &Parent, Function *Func, APValue &Result) {
+ InterpResult Flag;
+ {
+ InterpState State(Parent, *P, Stk, *this);
+ State.Current = new InterpFrame(State, Func, nullptr, {}, {});
+ if (Interpret(State, Result)) {
+ Flag = InterpResult::Success;
+ } else {
+ Flag = InterpResult::Fail;
+ }
+ }
+
+ if (Flag != InterpResult::Success)
+ Stk.clear();
+ return Flag;
+}
+
+InterpResult Context::Check(State &Parent, llvm::Expected<bool> &&R) {
+ if (R) {
+ return *R ? InterpResult::Success : InterpResult::Fail;
+ } else if (ForceInterp) {
+ handleAllErrors(R.takeError(), [&Parent](ByteCodeGenError &Err) {
+ Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
+ });
+ return InterpResult::Fail;
+ } else {
+ consumeError(R.takeError());
+ return InterpResult::Bail;
+ }
+}