This revision was automatically updated to reflect the committed changes.
Closed by commit rG31a3c5fb45b7: [clang] use string tables for static
diagnostic descriptions (authored by froydnj).
Changed prior to commit:
https://reviews.llvm.org/D81865?vs=288628&id=294063#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D81865/new/
https://reviews.llvm.org/D81865
Files:
clang/lib/Basic/DiagnosticIDs.cpp
Index: clang/lib/Basic/DiagnosticIDs.cpp
===================================================================
--- clang/lib/Basic/DiagnosticIDs.cpp
+++ clang/lib/Basic/DiagnosticIDs.cpp
@@ -26,6 +26,78 @@
namespace {
+struct StaticDiagInfoRec;
+
+// Store the descriptions in a separate table to avoid pointers that need to
+// be relocated, and also decrease the amount of data needed on 64-bit
+// platforms. See "How To Write Shared Libraries" by Ulrich Drepper.
+struct StaticDiagInfoDescriptionStringTable {
+#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR, \
+ SHOWINSYSHEADER, DEFERRABLE, CATEGORY) \
+ char ENUM##_desc[sizeof(DESC)];
+ // clang-format off
+#include "clang/Basic/DiagnosticCommonKinds.inc"
+#include "clang/Basic/DiagnosticDriverKinds.inc"
+#include "clang/Basic/DiagnosticFrontendKinds.inc"
+#include "clang/Basic/DiagnosticSerializationKinds.inc"
+#include "clang/Basic/DiagnosticLexKinds.inc"
+#include "clang/Basic/DiagnosticParseKinds.inc"
+#include "clang/Basic/DiagnosticASTKinds.inc"
+#include "clang/Basic/DiagnosticCommentKinds.inc"
+#include "clang/Basic/DiagnosticCrossTUKinds.inc"
+#include "clang/Basic/DiagnosticSemaKinds.inc"
+#include "clang/Basic/DiagnosticAnalysisKinds.inc"
+#include "clang/Basic/DiagnosticRefactoringKinds.inc"
+ // clang-format on
+#undef DIAG
+};
+
+const StaticDiagInfoDescriptionStringTable StaticDiagInfoDescriptions = {
+#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR, \
+ SHOWINSYSHEADER, DEFERRABLE, CATEGORY) \
+ DESC,
+ // clang-format off
+#include "clang/Basic/DiagnosticCommonKinds.inc"
+#include "clang/Basic/DiagnosticDriverKinds.inc"
+#include "clang/Basic/DiagnosticFrontendKinds.inc"
+#include "clang/Basic/DiagnosticSerializationKinds.inc"
+#include "clang/Basic/DiagnosticLexKinds.inc"
+#include "clang/Basic/DiagnosticParseKinds.inc"
+#include "clang/Basic/DiagnosticASTKinds.inc"
+#include "clang/Basic/DiagnosticCommentKinds.inc"
+#include "clang/Basic/DiagnosticCrossTUKinds.inc"
+#include "clang/Basic/DiagnosticSemaKinds.inc"
+#include "clang/Basic/DiagnosticAnalysisKinds.inc"
+#include "clang/Basic/DiagnosticRefactoringKinds.inc"
+ // clang-format on
+#undef DIAG
+};
+
+extern const StaticDiagInfoRec StaticDiagInfo[];
+
+// Stored separately from StaticDiagInfoRec to pack better. Otherwise,
+// StaticDiagInfoRec would have extra padding on 64-bit platforms.
+const uint32_t StaticDiagInfoDescriptionOffsets[] = {
+#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR, \
+ SHOWINSYSHEADER, DEFERRABLE, CATEGORY) \
+ offsetof(StaticDiagInfoDescriptionStringTable, ENUM##_desc),
+ // clang-format off
+#include "clang/Basic/DiagnosticCommonKinds.inc"
+#include "clang/Basic/DiagnosticDriverKinds.inc"
+#include "clang/Basic/DiagnosticFrontendKinds.inc"
+#include "clang/Basic/DiagnosticSerializationKinds.inc"
+#include "clang/Basic/DiagnosticLexKinds.inc"
+#include "clang/Basic/DiagnosticParseKinds.inc"
+#include "clang/Basic/DiagnosticASTKinds.inc"
+#include "clang/Basic/DiagnosticCommentKinds.inc"
+#include "clang/Basic/DiagnosticCrossTUKinds.inc"
+#include "clang/Basic/DiagnosticSemaKinds.inc"
+#include "clang/Basic/DiagnosticAnalysisKinds.inc"
+#include "clang/Basic/DiagnosticRefactoringKinds.inc"
+ // clang-format on
+#undef DIAG
+};
+
// Diagnostic classes.
enum {
CLASS_NOTE = 0x01,
@@ -48,14 +120,16 @@
uint16_t OptionGroupIndex;
uint16_t DescriptionLen;
- const char *DescriptionStr;
unsigned getOptionGroupIndex() const {
return OptionGroupIndex;
}
StringRef getDescription() const {
- return StringRef(DescriptionStr, DescriptionLen);
+ size_t MyIndex = this - &StaticDiagInfo[0];
+ uint32_t StringOffset = StaticDiagInfoDescriptionOffsets[MyIndex];
+ const char* Table = reinterpret_cast<const char*>(&StaticDiagInfoDescriptions);
+ return StringRef(&Table[StringOffset], DescriptionLen);
}
diag::Flavor getFlavor() const {
@@ -93,14 +167,21 @@
#undef VALIDATE_DIAG_SIZE
#undef STRINGIFY_NAME
-} // namespace anonymous
-
-static const StaticDiagInfoRec StaticDiagInfo[] = {
+const StaticDiagInfoRec StaticDiagInfo[] = {
#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR, \
SHOWINSYSHEADER, DEFERRABLE, CATEGORY) \
- {diag::ENUM, DEFAULT_SEVERITY, CLASS, DiagnosticIDs::SFINAE, \
- NOWERROR, SHOWINSYSHEADER, DEFERRABLE, CATEGORY, \
- GROUP, STR_SIZE(DESC, uint16_t), DESC},
+ { \
+ diag::ENUM, \
+ DEFAULT_SEVERITY, \
+ CLASS, \
+ DiagnosticIDs::SFINAE, \
+ NOWERROR, \
+ SHOWINSYSHEADER, \
+ DEFERRABLE, \
+ CATEGORY, \
+ GROUP, \
+ STR_SIZE(DESC, uint16_t)},
+ // clang-format off
#include "clang/Basic/DiagnosticCommonKinds.inc"
#include "clang/Basic/DiagnosticDriverKinds.inc"
#include "clang/Basic/DiagnosticFrontendKinds.inc"
@@ -113,9 +194,12 @@
#include "clang/Basic/DiagnosticSemaKinds.inc"
#include "clang/Basic/DiagnosticAnalysisKinds.inc"
#include "clang/Basic/DiagnosticRefactoringKinds.inc"
+ // clang-format on
#undef DIAG
};
+} // namespace
+
static const unsigned StaticDiagInfoSize = llvm::array_lengthof(StaticDiagInfo);
/// GetDiagInfo - Return the StaticDiagInfoRec entry for the specified DiagID,
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