forked from OSchip/llvm-project
268 lines
10 KiB
C++
268 lines
10 KiB
C++
//===--- DiagChecker.cpp - Diagnostic Checking Functions ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Process the input files and check that the diagnostic messages are expected.
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//
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//===----------------------------------------------------------------------===//
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#include "clang.h"
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#include "ASTConsumers.h"
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#include "clang/Driver/TextDiagnosticBuffer.h"
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#include "clang/Sema/ParseAST.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/Preprocessor.h"
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using namespace clang;
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typedef TextDiagnosticBuffer::DiagList DiagList;
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typedef TextDiagnosticBuffer::const_iterator const_diag_iterator;
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// USING THE DIAGNOSTIC CHECKER:
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//
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// Indicating that a line expects an error or a warning is simple. Put a comment
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// on the line that has the diagnostic, use "expected-{error,warning}" to tag
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// if it's an expected error or warning, and place the expected text between {{
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// and }} markers. The full text doesn't have to be included, only enough to
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// ensure that the correct diagnostic was emitted.
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//
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// Here's an example:
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//
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// int A = B; // expected-error {{use of undeclared identifier 'B'}}
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//
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// You can place as many diagnostics on one line as you wish. To make the code
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// more readable, you can use slash-newline to separate out the diagnostics.
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static const char * const ExpectedErrStr = "expected-error";
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static const char * const ExpectedWarnStr = "expected-warning";
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static const char * const ExpectedNoteStr = "expected-note";
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/// FindDiagnostics - Go through the comment and see if it indicates expected
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/// diagnostics. If so, then put them in a diagnostic list.
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///
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static void FindDiagnostics(const std::string &Comment,
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DiagList &ExpectedDiags,
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SourceManager &SourceMgr,
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SourceLocation Pos,
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const char * const ExpectedStr) {
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// Find all expected diagnostics
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typedef std::string::size_type size_type;
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size_type ColNo = 0;
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for (;;) {
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ColNo = Comment.find(ExpectedStr, ColNo);
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if (ColNo == std::string::npos) break;
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size_type OpenDiag = Comment.find("{{", ColNo);
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if (OpenDiag == std::string::npos) {
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fprintf(stderr,
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"oops:%d: Cannot find beginning of expected error string\n",
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SourceMgr.getLogicalLineNumber(Pos));
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break;
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}
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OpenDiag += 2;
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size_type CloseDiag = Comment.find("}}", OpenDiag);
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if (CloseDiag == std::string::npos) {
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fprintf(stderr,
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"oops:%d: Cannot find end of expected error string\n",
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SourceMgr.getLogicalLineNumber(Pos));
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break;
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}
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std::string Msg(Comment.substr(OpenDiag, CloseDiag - OpenDiag));
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ExpectedDiags.push_back(std::make_pair(Pos, Msg));
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ColNo = CloseDiag + 2;
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}
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}
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/// FindExpectedDiags - Lex the main source file to find all of the
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// expected errors and warnings.
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static void FindExpectedDiags(Preprocessor &PP,
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DiagList &ExpectedErrors,
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DiagList &ExpectedWarnings,
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DiagList &ExpectedNotes) {
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// Return comments as tokens, this is how we find expected diagnostics.
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PP.SetCommentRetentionState(true, true);
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// Enter the cave.
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PP.EnterMainSourceFile();
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// Turn off all warnings from relexing or preprocessing.
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PP.getDiagnostics().setWarnOnExtensions(false);
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PP.getDiagnostics().setErrorOnExtensions(false);
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for (unsigned i = 0; i != diag::NUM_BUILTIN_DIAGNOSTICS; ++i)
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if (PP.getDiagnostics().isBuiltinNoteWarningOrExtension((diag::kind)i))
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PP.getDiagnostics().setDiagnosticMapping((diag::kind)i, diag::MAP_IGNORE);
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Token Tok;
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do {
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PP.Lex(Tok);
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if (Tok.is(tok::comment)) {
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std::string Comment = PP.getSpelling(Tok);
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// Find all expected errors
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FindDiagnostics(Comment, ExpectedErrors,PP.getSourceManager(),
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Tok.getLocation(), ExpectedErrStr);
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// Find all expected warnings
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FindDiagnostics(Comment, ExpectedWarnings, PP.getSourceManager(),
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Tok.getLocation(), ExpectedWarnStr);
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// Find all expected notes
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FindDiagnostics(Comment, ExpectedNotes, PP.getSourceManager(),
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Tok.getLocation(), ExpectedNoteStr);
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}
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} while (Tok.isNot(tok::eof));
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PP.SetCommentRetentionState(false, false);
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}
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/// PrintProblem - This takes a diagnostic map of the delta between expected and
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/// seen diagnostics. If there's anything in it, then something unexpected
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/// happened. Print the map out in a nice format and return "true". If the map
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/// is empty and we're not going to print things, then return "false".
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///
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static bool PrintProblem(SourceManager &SourceMgr,
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const_diag_iterator diag_begin,
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const_diag_iterator diag_end,
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const char *Msg) {
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if (diag_begin == diag_end) return false;
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fprintf(stderr, "%s\n", Msg);
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for (const_diag_iterator I = diag_begin, E = diag_end; I != E; ++I)
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fprintf(stderr, " Line %d: %s\n",
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SourceMgr.getLogicalLineNumber(I->first),
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I->second.c_str());
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return true;
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}
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/// CompareDiagLists - Compare two diangnostic lists and return the difference
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/// between them.
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///
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static bool CompareDiagLists(SourceManager &SourceMgr,
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const_diag_iterator d1_begin,
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const_diag_iterator d1_end,
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const_diag_iterator d2_begin,
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const_diag_iterator d2_end,
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const char *Msg) {
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DiagList DiffList;
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for (const_diag_iterator I = d1_begin, E = d1_end; I != E; ++I) {
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unsigned LineNo1 = SourceMgr.getLogicalLineNumber(I->first);
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const std::string &Diag1 = I->second;
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bool Found = false;
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for (const_diag_iterator II = d2_begin, IE = d2_end; II != IE; ++II) {
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unsigned LineNo2 = SourceMgr.getLogicalLineNumber(II->first);
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if (LineNo1 != LineNo2) continue;
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const std::string &Diag2 = II->second;
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if (Diag2.find(Diag1) != std::string::npos ||
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Diag1.find(Diag2) != std::string::npos) {
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Found = true;
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break;
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}
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}
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if (!Found)
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DiffList.push_back(std::make_pair(I->first, Diag1));
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}
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return PrintProblem(SourceMgr, DiffList.begin(), DiffList.end(), Msg);
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}
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/// CheckResults - This compares the expected results to those that
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/// were actually reported. It emits any discrepencies. Return "true" if there
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/// were problems. Return "false" otherwise.
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///
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static bool CheckResults(Preprocessor &PP,
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const DiagList &ExpectedErrors,
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const DiagList &ExpectedWarnings,
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const DiagList &ExpectedNotes) {
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const DiagnosticClient *DiagClient = PP.getDiagnostics().getClient();
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assert(DiagClient != 0 &&
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"DiagChecker requires a valid TextDiagnosticBuffer");
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const TextDiagnosticBuffer &Diags =
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static_cast<const TextDiagnosticBuffer&>(*DiagClient);
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SourceManager &SourceMgr = PP.getSourceManager();
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// We want to capture the delta between what was expected and what was
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// seen.
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//
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// Expected \ Seen - set expected but not seen
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// Seen \ Expected - set seen but not expected
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bool HadProblem = false;
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// See if there were errors that were expected but not seen.
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HadProblem |= CompareDiagLists(SourceMgr,
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ExpectedErrors.begin(), ExpectedErrors.end(),
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Diags.err_begin(), Diags.err_end(),
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"Errors expected but not seen:");
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// See if there were errors that were seen but not expected.
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HadProblem |= CompareDiagLists(SourceMgr,
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Diags.err_begin(), Diags.err_end(),
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ExpectedErrors.begin(), ExpectedErrors.end(),
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"Errors seen but not expected:");
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// See if there were warnings that were expected but not seen.
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HadProblem |= CompareDiagLists(SourceMgr,
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ExpectedWarnings.begin(),
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ExpectedWarnings.end(),
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Diags.warn_begin(), Diags.warn_end(),
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"Warnings expected but not seen:");
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// See if there were warnings that were seen but not expected.
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HadProblem |= CompareDiagLists(SourceMgr,
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Diags.warn_begin(), Diags.warn_end(),
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ExpectedWarnings.begin(),
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ExpectedWarnings.end(),
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"Warnings seen but not expected:");
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// See if there were notes that were expected but not seen.
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HadProblem |= CompareDiagLists(SourceMgr,
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ExpectedNotes.begin(),
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ExpectedNotes.end(),
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Diags.note_begin(), Diags.note_end(),
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"Notes expected but not seen:");
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// See if there were notes that were seen but not expected.
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HadProblem |= CompareDiagLists(SourceMgr,
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Diags.note_begin(), Diags.note_end(),
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ExpectedNotes.begin(),
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ExpectedNotes.end(),
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"Notes seen but not expected:");
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return HadProblem;
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}
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/// CheckASTConsumer - Implement diagnostic checking for AST consumers.
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bool clang::CheckASTConsumer(Preprocessor &PP, ASTConsumer* C) {
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// Parse the AST and run the consumer, ultimately deleting C.
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ParseAST(PP, C);
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return CheckDiagnostics(PP);
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}
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/// CheckDiagnostics - Gather the expected diagnostics and check them.
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bool clang::CheckDiagnostics(Preprocessor &PP) {
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// Gather the set of expected diagnostics.
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DiagList ExpectedErrors, ExpectedWarnings, ExpectedNotes;
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FindExpectedDiags(PP, ExpectedErrors, ExpectedWarnings, ExpectedNotes);
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// Check that the expected diagnostics occurred.
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return CheckResults(PP, ExpectedErrors, ExpectedWarnings, ExpectedNotes);
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}
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