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DiagnosticIDs: Forbid Diag ID from being valid 

Diag ID is used throughout clang as a sentinel id meaning "this is an
invalid diagnostic id."  Confusingly, Diag ID maps to a valid, usable,
diagnostic id.  Instead, start diagnostic ids at ID one.

Incidently, remove an unused element from StaticDiagInfo.

llvm-svn: 186760
This commit is contained in:
David Majnemer 2013-07-20 07:15:15 +00:00
parent a9b57f6bea
commit 38af2a2158
2 changed files with 7 additions and 9 deletions
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4
clang/include/clang/Basic/DiagnosticIDs.h
View File

@ -28,7 +28,8 @@ namespace clang {
namespace diag {
// Start position for diagnostics.
enum {
DIAG_START_DRIVER = 300,
DIAG_START_COMMON = 0,
DIAG_START_DRIVER = DIAG_START_COMMON + 300,
DIAG_START_FRONTEND = DIAG_START_DRIVER + 100,
DIAG_START_SERIALIZATION = DIAG_START_FRONTEND + 100,
DIAG_START_LEX = DIAG_START_SERIALIZATION + 120,
@ -49,6 +50,7 @@ namespace clang {
enum {
#define DIAG(ENUM,FLAGS,DEFAULT_MAPPING,DESC,GROUP,\
SFINAE,ACCESS,CATEGORY,NOWERROR,SHOWINSYSHEADER) ENUM,
#define COMMONSTART
#include "clang/Basic/DiagnosticCommonKinds.inc"
NUM_BUILTIN_COMMON_DIAGNOSTICS
#undef DIAG

12
clang/lib/Basic/DiagnosticIDs.cpp
View File

@ -15,8 +15,8 @@
#include "clang/Basic/AllDiagnostics.h"
#include "clang/Basic/DiagnosticCategories.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include <map>
using namespace clang;
@ -83,11 +83,9 @@ static const StaticDiagInfoRec StaticDiagInfo[] = {
#include "clang/Basic/DiagnosticSemaKinds.inc"
#include "clang/Basic/DiagnosticAnalysisKinds.inc"
#undef DIAG
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
};
static const unsigned StaticDiagInfoSize =
llvm::array_lengthof(StaticDiagInfo)-1;
static const unsigned StaticDiagInfoSize = llvm::array_lengthof(StaticDiagInfo);
/// GetDiagInfo - Return the StaticDiagInfoRec entry for the specified DiagID,
/// or null if the ID is invalid.
@ -106,7 +104,7 @@ static const StaticDiagInfoRec *GetDiagInfo(unsigned DiagID) {
// Out of bounds diag. Can't be in the table.
using namespace diag;
if (DiagID >= DIAG_UPPER_LIMIT)
if (DiagID >= DIAG_UPPER_LIMIT || DiagID <= DIAG_START_COMMON)
return 0;
// Compute the index of the requested diagnostic in the static table.
@ -118,8 +116,7 @@ static const StaticDiagInfoRec *GetDiagInfo(unsigned DiagID) {
// This is cheaper than a binary search on the table as it doesn't touch
// memory at all.
unsigned Offset = 0;
unsigned ID = DiagID;
#define DIAG_START_COMMON 0 // Sentinel value.
unsigned ID = DiagID - DIAG_START_COMMON - 1;
#define CATEGORY(NAME, PREV) \
if (DiagID > DIAG_START_##NAME) { \
Offset += NUM_BUILTIN_##PREV##_DIAGNOSTICS - DIAG_START_##PREV - 1; \
@ -135,7 +132,6 @@ CATEGORY(COMMENT, AST)
CATEGORY(SEMA, COMMENT)
CATEGORY(ANALYSIS, SEMA)
#undef CATEGORY
#undef DIAG_START_COMMON
// Avoid out of bounds reads.
if (ID + Offset >= StaticDiagInfoSize)