David Gross | 46e146e | 2015-11-11 15:14:01 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015, 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_special_kernel_param.h" |
| 18 | |
| 19 | #include "clang/AST/ASTContext.h" |
| 20 | |
| 21 | #include "bcinfo/MetadataExtractor.h" |
| 22 | |
| 23 | #include "slang_assert.h" |
| 24 | #include "slang_rs_context.h" |
| 25 | #include "slang_version.h" |
| 26 | |
| 27 | namespace { |
| 28 | |
| 29 | enum SpecialParameterKind { |
| 30 | SPK_LOCATION, // 'int' or 'unsigned int' |
| 31 | SPK_CONTEXT, // rs_kernel_context |
| 32 | }; |
| 33 | |
| 34 | struct SpecialParameter { |
| 35 | const char *name; |
| 36 | bcinfo::MetadataSignatureBitval bitval; |
| 37 | SpecialParameterKind kind; |
| 38 | SlangTargetAPI minAPI; |
| 39 | }; |
| 40 | |
| 41 | // Table entries are in the order parameters must occur in a kernel parameter list. |
| 42 | const SpecialParameter specialParameterTable[] = { |
| 43 | { "context", bcinfo::MD_SIG_Ctxt, SPK_CONTEXT, SLANG_M_TARGET_API }, |
| 44 | { "x", bcinfo::MD_SIG_X, SPK_LOCATION, SLANG_MINIMUM_TARGET_API }, |
| 45 | { "y", bcinfo::MD_SIG_Y, SPK_LOCATION, SLANG_MINIMUM_TARGET_API }, |
| 46 | { "z", bcinfo::MD_SIG_Z, SPK_LOCATION, SLANG_M_TARGET_API }, |
| 47 | { nullptr, bcinfo::MD_SIG_None, SPK_LOCATION, SLANG_MINIMUM_TARGET_API }, // marks end of table |
| 48 | }; |
| 49 | |
| 50 | // If the specified name matches the name of an entry in |
| 51 | // specialParameterTable, return the corresponding table index. |
| 52 | // Return -1 if not found. |
| 53 | int lookupSpecialKernelParameter(const llvm::StringRef name) { |
| 54 | for (int i = 0; specialParameterTable[i].name != nullptr; ++i) { |
| 55 | if (name.equals(specialParameterTable[i].name)) { |
| 56 | return i; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | return -1; |
| 61 | } |
| 62 | |
| 63 | } // end anonymous namespace |
| 64 | |
| 65 | namespace slang { |
| 66 | |
| 67 | // Is the specified name the name of an entry in the specialParameterTable? |
| 68 | bool isSpecialKernelParameter(const llvm::StringRef Name) { |
| 69 | return lookupSpecialKernelParameter(Name) >= 0; |
| 70 | } |
| 71 | |
| 72 | // Return a comma-separated list of names in specialParameterTable |
| 73 | // that are available at the specified API level. |
| 74 | std::string listSpecialKernelParameters(unsigned int api) { |
| 75 | std::string ret; |
| 76 | bool first = true; |
| 77 | for (int i = 0; specialParameterTable[i].name != nullptr; ++i) { |
| 78 | if (specialParameterTable[i].minAPI > api) |
| 79 | continue; |
| 80 | if (first) |
| 81 | first = false; |
| 82 | else |
| 83 | ret += ", "; |
| 84 | ret += "'"; |
| 85 | ret += specialParameterTable[i].name; |
| 86 | ret += "'"; |
| 87 | } |
| 88 | return ret; |
| 89 | } |
| 90 | |
| 91 | // Process the optional special parameters: |
| 92 | // - Sets *IndexOfFirstSpecialParameter to the index of the first special parameter, or |
| 93 | // FD->getNumParams() if none are found. |
| 94 | // - Add bits to *SignatureMetadata for the found special parameters. |
| 95 | // Returns true if no errors. |
| 96 | bool processSpecialKernelParameters( |
| 97 | slang::RSContext *Context, |
Chih-Hung Hsieh | e2ead84 | 2016-08-12 15:57:25 -0700 | [diff] [blame] | 98 | const std::function<std::string ()> &DiagnosticDescription, |
David Gross | 46e146e | 2015-11-11 15:14:01 -0800 | [diff] [blame] | 99 | const clang::FunctionDecl *FD, |
| 100 | size_t *IndexOfFirstSpecialParameter, |
| 101 | unsigned int *SignatureMetadata) { |
| 102 | slangAssert(IndexOfFirstSpecialParameter != nullptr); |
| 103 | slangAssert(SignatureMetadata != nullptr); |
| 104 | slangAssert(*SignatureMetadata == 0); |
| 105 | clang::ASTContext &C = Context->getASTContext(); |
| 106 | |
| 107 | // Find all special parameters if present. |
| 108 | int LastSpecialParameterIdx = -1; // index into specialParameterTable |
| 109 | int FirstLocationSpecialParameterIdx = -1; // index into specialParameterTable |
| 110 | clang::QualType FirstLocationSpecialParameterType; |
| 111 | size_t NumParams = FD->getNumParams(); |
| 112 | *IndexOfFirstSpecialParameter = NumParams; |
| 113 | bool valid = true; |
| 114 | for (size_t i = 0; i < NumParams; i++) { |
| 115 | const clang::ParmVarDecl *PVD = FD->getParamDecl(i); |
| 116 | const llvm::StringRef ParamName = PVD->getName(); |
| 117 | const clang::QualType Type = PVD->getType(); |
| 118 | const clang::QualType QT = Type.getCanonicalType(); |
| 119 | const clang::QualType UT = QT.getUnqualifiedType(); |
| 120 | int SpecialParameterIdx = lookupSpecialKernelParameter(ParamName); |
| 121 | |
| 122 | static const char KernelContextUnqualifiedTypeName[] = |
| 123 | "const struct rs_kernel_context_t *"; |
| 124 | static const char KernelContextTypeName[] = "rs_kernel_context"; |
| 125 | |
| 126 | // If the type is rs_context, it should have been named "context" and classified |
| 127 | // as a special parameter. |
| 128 | if (SpecialParameterIdx < 0 && UT.getAsString() == KernelContextUnqualifiedTypeName) { |
| 129 | Context->ReportError( |
| 130 | PVD->getLocation(), |
| 131 | "The special parameter of type '%0' must be called " |
| 132 | "'context' instead of '%1'.") |
| 133 | << KernelContextTypeName << ParamName; |
| 134 | SpecialParameterIdx = lookupSpecialKernelParameter("context"); |
| 135 | } |
| 136 | |
| 137 | // If it's not a special parameter, check that it appears before any special |
| 138 | // parameter. |
| 139 | if (SpecialParameterIdx < 0) { |
| 140 | if (*IndexOfFirstSpecialParameter < NumParams) { |
| 141 | Context->ReportError(PVD->getLocation(), |
| 142 | "In %0, parameter '%1' cannot " |
| 143 | "appear after any of the special parameters (%2).") |
| 144 | << DiagnosticDescription() |
| 145 | << ParamName |
| 146 | << listSpecialKernelParameters(Context->getTargetAPI()); |
| 147 | valid = false; |
| 148 | } |
| 149 | continue; |
| 150 | } |
| 151 | |
| 152 | const SpecialParameter &SP = specialParameterTable[SpecialParameterIdx]; |
| 153 | |
| 154 | // Verify that this special parameter is OK for the current API level. |
| 155 | if (Context->getTargetAPI() < SP.minAPI) { |
| 156 | Context->ReportError(PVD->getLocation(), |
| 157 | "%0 targeting SDK levels " |
| 158 | "%1-%2 may not use special parameter '%3'.") |
| 159 | << DiagnosticDescription() |
| 160 | << SLANG_MINIMUM_TARGET_API << (SP.minAPI - 1) |
| 161 | << SP.name; |
| 162 | valid = false; |
| 163 | } |
| 164 | |
| 165 | // Check that the order of the special parameters is correct. |
| 166 | if (SpecialParameterIdx < LastSpecialParameterIdx) { |
| 167 | Context->ReportError( |
| 168 | PVD->getLocation(), |
| 169 | "In %0, special parameter '%1' must " |
| 170 | "be defined before special parameter '%2'.") |
| 171 | << DiagnosticDescription() |
| 172 | << SP.name |
| 173 | << specialParameterTable[LastSpecialParameterIdx].name; |
| 174 | valid = false; |
| 175 | } |
| 176 | |
| 177 | // Validate the data type of the special parameter. |
| 178 | switch (SP.kind) { |
| 179 | case SPK_LOCATION: { |
| 180 | // Location special parameters can only be int or uint. |
| 181 | if (UT != C.UnsignedIntTy && UT != C.IntTy) { |
| 182 | Context->ReportError(PVD->getLocation(), |
| 183 | "Special parameter '%0' must be of type 'int' or " |
| 184 | "'unsigned int'. It is of type '%1'.") |
| 185 | << ParamName << Type.getAsString(); |
| 186 | valid = false; |
| 187 | } |
| 188 | |
| 189 | // Ensure that all location special parameters have the same type. |
| 190 | if (FirstLocationSpecialParameterIdx >= 0) { |
| 191 | if (Type != FirstLocationSpecialParameterType) { |
| 192 | Context->ReportError( |
| 193 | PVD->getLocation(), |
| 194 | "Special parameters '%0' and '%1' must be of the same type. " |
| 195 | "'%0' is of type '%2' while '%1' is of type '%3'.") |
| 196 | << specialParameterTable[FirstLocationSpecialParameterIdx].name |
| 197 | << SP.name << FirstLocationSpecialParameterType.getAsString() |
| 198 | << Type.getAsString(); |
| 199 | valid = false; |
| 200 | } |
| 201 | } else { |
| 202 | FirstLocationSpecialParameterIdx = SpecialParameterIdx; |
| 203 | FirstLocationSpecialParameterType = Type; |
| 204 | } |
| 205 | } break; |
| 206 | case SPK_CONTEXT: { |
| 207 | // Check that variables named "context" are of type rs_context. |
| 208 | if (UT.getAsString() != KernelContextUnqualifiedTypeName) { |
| 209 | Context->ReportError(PVD->getLocation(), |
| 210 | "Special parameter '%0' must be of type '%1'. " |
| 211 | "It is of type '%2'.") |
| 212 | << ParamName << KernelContextTypeName |
| 213 | << Type.getAsString(); |
| 214 | valid = false; |
| 215 | } |
| 216 | } break; |
| 217 | default: |
| 218 | slangAssert(!"Unexpected special parameter type"); |
| 219 | } |
| 220 | |
| 221 | // We should not be invoked if two parameters of the same name are present. |
| 222 | slangAssert(!(*SignatureMetadata & SP.bitval)); |
| 223 | *SignatureMetadata |= SP.bitval; |
| 224 | |
| 225 | LastSpecialParameterIdx = SpecialParameterIdx; |
| 226 | // If this is the first time we find a special parameter, save it. |
| 227 | if (*IndexOfFirstSpecialParameter >= NumParams) { |
| 228 | *IndexOfFirstSpecialParameter = i; |
| 229 | } |
| 230 | } |
| 231 | return valid; |
| 232 | } |
| 233 | |
| 234 | } // namespace slang |