slang_rs_export_var.cpp revision d369cda199b11ae28a1935e06398c2162cf146f3 
1/*
2 * Copyright 2010-2012, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "slang_rs_export_var.h"
18
19#include "clang/AST/Type.h"
20
21#include "llvm/ADT/APSInt.h"
22
23#include "slang_rs_context.h"
24#include "slang_rs_export_type.h"
25
26namespace slang {
27
28namespace {
29
30static clang::DiagnosticBuilder ReportVarError(RSContext *Context,
31                           const clang::SourceLocation Loc,
32                           const char *Message) {
33  clang::DiagnosticsEngine *DiagEngine = Context->getDiagnostics();
34  const clang::SourceManager *SM = Context->getSourceManager();
35  return DiagEngine->Report(clang::FullSourceLoc(Loc, *SM),
36      DiagEngine->getCustomDiagID(clang::DiagnosticsEngine::Error, Message));
37}
38
39}  // namespace
40
41RSExportVar::RSExportVar(RSContext *Context,
42                         const clang::VarDecl *VD,
43                         const RSExportType *ET)
44    : RSExportable(Context, RSExportable::EX_VAR),
45      mName(VD->getName().data(), VD->getName().size()),
46      mET(ET),
47      mIsConst(false),
48      mArraySize(0),
49      mNumInits(0) {
50  // mInit - Evaluate initializer expression
51  const clang::Expr *Initializer = VD->getAnyInitializer();
52  if (Initializer != NULL) {
53    switch (ET->getClass()) {
54      case RSExportType::ExportClassPrimitive:
55      case RSExportType::ExportClassVector: {
56        Initializer->EvaluateAsRValue(mInit, Context->getASTContext());
57        break;
58      }
59      case RSExportType::ExportClassPointer: {
60        if (Initializer->isNullPointerConstant(Context->getASTContext(),
61                clang::Expr::NPC_ValueDependentIsNotNull)) {
62          mInit.Val = clang::APValue(llvm::APSInt(1));
63        } else {
64          if (!Initializer->EvaluateAsRValue(mInit, Context->getASTContext())) {
65            ReportVarError(Context, Initializer->getExprLoc(),
66                           "initializer is not an R-value");
67          }
68        }
69        break;
70      }
71      case RSExportType::ExportClassConstantArray: {
72        const clang::InitListExpr *IList =
73            static_cast<const clang::InitListExpr*>(Initializer);
74        if (!IList) {
75          ReportVarError(Context, VD->getLocation(),
76                         "Unable to find initializer list");
77          break;
78        }
79        const RSExportConstantArrayType *ECAT =
80            static_cast<const RSExportConstantArrayType*>(ET);
81        mArraySize = ECAT->getSize();
82        mNumInits = IList->getNumInits();
83        for (unsigned int i = 0; i < mNumInits; i++) {
84          clang::Expr::EvalResult tempInit;
85          if (!IList->getInit(i)->EvaluateAsRValue(tempInit,
86                                                   Context->getASTContext())) {
87            ReportVarError(Context, IList->getInit(i)->getExprLoc(),
88                           "initializer is not an R-value");
89          }
90          mInitArray.push_back(tempInit);
91        }
92        break;
93      }
94      case RSExportType::ExportClassMatrix:
95      case RSExportType::ExportClassRecord: {
96        ReportVarError(Context, VD->getLocation(),
97                       "Reflection of initializer to variable '%0' (of type "
98                       "'%1') is unsupported currently.")
99            << mName
100            << ET->getName();
101        break;
102      }
103      default: {
104        slangAssert(false && "Unknown class of type");
105      }
106    }
107  }
108
109  // mIsConst - Is it a constant?
110  clang::QualType QT = VD->getTypeSourceInfo()->getType();
111  if (!QT.isNull()) {
112    mIsConst = QT.isConstQualified();
113  }
114
115  return;
116}
117
118}  // namespace slang
119