[clang] 5fedc2b - [Clang] Avoid crashing when generating crash diagnostics when '#pragma clang __debug [assert|crash|parser_crash|llvm_fatal_error|llvm_unreachable|overflow_stack]' are used
Alexandre Ganea via cfe-commits
cfe-commits at lists.llvm.org
Thu Feb 6 12:49:02 PST 2020
Author: Alexandre Ganea
Date: 2020-02-06T15:48:51-05:00
New Revision: 5fedc2b410853a6aef05e8edf19ebfc4e071e28f
URL: https://github.com/llvm/llvm-project/commit/5fedc2b410853a6aef05e8edf19ebfc4e071e28f
DIFF: https://github.com/llvm/llvm-project/commit/5fedc2b410853a6aef05e8edf19ebfc4e071e28f.diff
LOG: [Clang] Avoid crashing when generating crash diagnostics when '#pragma clang __debug [assert|crash|parser_crash|llvm_fatal_error|llvm_unreachable|overflow_stack]' are used
Previously, when the above '#pragma clang __debug' were used, Driver::generateCompilationDiagnostics() wouldn't work as expected.
The 'clang -E' process created for diagnostics would crash, because it would reach again the intended crash in Pragma.cpp, PragmaDebugHandler::HandlePragma() while preprocessing.
When generating crash diagnostics, we now disable the intended crashing behavior with a new cc1 flag -disable-pragma-debug-crash.
Notes:
- #pragma clang __debug llvm_report_fatal isn't currently tested by crash-report.c, because it needs exit() to be handled differently in -fintegrated-cc1 mode. See https://reviews.llvm.org/D73742 for an upcoming fix.
- This is also needed to further validate that -MF is removed from the 'clang -E ' crash diagnostic cmd-line (currently not the case). See https://reviews.llvm.org/D74076 for an upcoming fix.
Differential Revision: https://reviews.llvm.org/D74070
Added:
Modified:
clang/include/clang/Driver/CC1Options.td
clang/include/clang/Lex/PreprocessorOptions.h
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/lib/Lex/Pragma.cpp
clang/test/Driver/crash-report.c
clang/test/Driver/output-file-cleanup.c
Removed:
################################################################################
diff --git a/clang/include/clang/Driver/CC1Options.td b/clang/include/clang/Driver/CC1Options.td
index 0d0b05f8961c..733a1080be52 100644
--- a/clang/include/clang/Driver/CC1Options.td
+++ b/clang/include/clang/Driver/CC1Options.td
@@ -866,6 +866,8 @@ def detailed_preprocessing_record : Flag<["-"], "detailed-preprocessing-record">
HelpText<"include a detailed record of preprocessing actions">;
def setup_static_analyzer : Flag<["-"], "setup-static-analyzer">,
HelpText<"Set up preprocessor for static analyzer (done automatically when static analyzer is run).">;
+def disable_pragma_debug_crash : Flag<["-"], "disable-pragma-debug-crash">,
+ HelpText<"Disable any #pragma clang __debug that can lead to crashing behavior. This is meant for testing.">;
//===----------------------------------------------------------------------===//
// OpenCL Options
diff --git a/clang/include/clang/Lex/PreprocessorOptions.h b/clang/include/clang/Lex/PreprocessorOptions.h
index c281cd51e266..c551f87e0d7b 100644
--- a/clang/include/clang/Lex/PreprocessorOptions.h
+++ b/clang/include/clang/Lex/PreprocessorOptions.h
@@ -189,6 +189,9 @@ class PreprocessorOptions {
/// Set up preprocessor for RunAnalysis action.
bool SetUpStaticAnalyzer = false;
+ /// Prevents intended crashes when using #pragma clang __debug. For testing.
+ bool DisablePragmaDebugCrash = false;
+
public:
PreprocessorOptions() : PrecompiledPreambleBytes(0, false) {}
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 65039ac64b5a..9e2279e90b7e 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4750,6 +4750,11 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
: "-");
}
+ // Give the gen diagnostics more chances to succeed, by avoiding intentional
+ // crashes.
+ if (D.CCGenDiagnostics)
+ CmdArgs.push_back("-disable-pragma-debug-crash");
+
bool UseSeparateSections = isUseSeparateSections(Triple);
if (Args.hasFlag(options::OPT_ffunction_sections,
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 2fd66b6f546b..f95e8b4f0417 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -3470,6 +3470,7 @@ static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
Opts.LexEditorPlaceholders = false;
Opts.SetUpStaticAnalyzer = Args.hasArg(OPT_setup_static_analyzer);
+ Opts.DisablePragmaDebugCrash = Args.hasArg(OPT_disable_pragma_debug_crash);
}
static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
diff --git a/clang/lib/Lex/Pragma.cpp b/clang/lib/Lex/Pragma.cpp
index c881bcac9f38..a8cd18b123b0 100644
--- a/clang/lib/Lex/Pragma.cpp
+++ b/clang/lib/Lex/Pragma.cpp
@@ -30,6 +30,7 @@
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PreprocessorLexer.h"
+#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Lex/Token.h"
#include "clang/Lex/TokenLexer.h"
#include "llvm/ADT/ArrayRef.h"
@@ -1034,15 +1035,19 @@ struct PragmaDebugHandler : public PragmaHandler {
IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("assert")) {
- llvm_unreachable("This is an assertion!");
+ if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
+ llvm_unreachable("This is an assertion!");
} else if (II->isStr("crash")) {
- LLVM_BUILTIN_TRAP;
+ if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
+ LLVM_BUILTIN_TRAP;
} else if (II->isStr("parser_crash")) {
- Token Crasher;
- Crasher.startToken();
- Crasher.setKind(tok::annot_pragma_parser_crash);
- Crasher.setAnnotationRange(SourceRange(Tok.getLocation()));
- PP.EnterToken(Crasher, /*IsReinject*/false);
+ if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash) {
+ Token Crasher;
+ Crasher.startToken();
+ Crasher.setKind(tok::annot_pragma_parser_crash);
+ Crasher.setAnnotationRange(SourceRange(Tok.getLocation()));
+ PP.EnterToken(Crasher, /*IsReinject*/ false);
+ }
} else if (II->isStr("dump")) {
Token Identifier;
PP.LexUnexpandedToken(Identifier);
@@ -1074,9 +1079,11 @@ struct PragmaDebugHandler : public PragmaHandler {
<< II->getName();
}
} else if (II->isStr("llvm_fatal_error")) {
- llvm::report_fatal_error("#pragma clang __debug llvm_fatal_error");
+ if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
+ llvm::report_fatal_error("#pragma clang __debug llvm_fatal_error");
} else if (II->isStr("llvm_unreachable")) {
- llvm_unreachable("#pragma clang __debug llvm_unreachable");
+ if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
+ llvm_unreachable("#pragma clang __debug llvm_unreachable");
} else if (II->isStr("macro")) {
Token MacroName;
PP.LexUnexpandedToken(MacroName);
@@ -1103,7 +1110,8 @@ struct PragmaDebugHandler : public PragmaHandler {
}
M->dump();
} else if (II->isStr("overflow_stack")) {
- DebugOverflowStack();
+ if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
+ DebugOverflowStack();
} else if (II->isStr("captured")) {
HandleCaptured(PP);
} else {
diff --git a/clang/test/Driver/crash-report.c b/clang/test/Driver/crash-report.c
index 711b04ea4da0..641850de806b 100644
--- a/clang/test/Driver/crash-report.c
+++ b/clang/test/Driver/crash-report.c
@@ -1,25 +1,56 @@
// RUN: rm -rf %t
// RUN: mkdir %t
-// RUN: env TMPDIR=%t TEMP=%t TMP=%t RC_DEBUG_OPTIONS=1 \
-// RUN: CC_PRINT_HEADERS=1 CC_LOG_DIAGNOSTICS=1 \
-// RUN: not %clang -fsyntax-only %s \
+
+// RUN: echo '-fsyntax-only \
// RUN: -F/tmp/ -I /tmp/ -idirafter /tmp/ -iquote /tmp/ -isystem /tmp/ \
// RUN: -iprefix /the/prefix -iwithprefix /tmp -iwithprefixbefore /tmp/ \
// RUN: -Xclang -internal-isystem -Xclang /tmp/ \
// RUN: -Xclang -internal-externc-isystem -Xclang /tmp/ \
// RUN: -Xclang -main-file-name -Xclang foo.c \
-// RUN: -DFOO=BAR -DBAR="BAZ QUX" 2>&1 | FileCheck %s
+// RUN: -DFOO=BAR -DBAR="BAZ QUX"' > %t.rsp
+
+// RUN: env TMPDIR=%t TEMP=%t TMP=%t RC_DEBUG_OPTIONS=1 \
+// RUN: CC_PRINT_HEADERS=1 CC_LOG_DIAGNOSTICS=1 \
+// RUN: not %clang %s @%t.rsp -DPARSER 2>&1 | FileCheck %s
// RUN: cat %t/crash-report-*.c | FileCheck --check-prefix=CHECKSRC %s
// RUN: cat %t/crash-report-*.sh | FileCheck --check-prefix=CHECKSH %s
+
+// RUN: env TMPDIR=%t TEMP=%t TMP=%t RC_DEBUG_OPTIONS=1 \
+// RUN: CC_PRINT_HEADERS=1 CC_LOG_DIAGNOSTICS=1 \
+// RUN: not %clang %s @%t.rsp -DCRASH 2>&1 | FileCheck %s
+// RUN: cat %t/crash-report-*.c | FileCheck --check-prefix=CHECKSRC %s
+// RUN: cat %t/crash-report-*.sh | FileCheck --check-prefix=CHECKSH %s
+
+// RUN: env TMPDIR=%t TEMP=%t TMP=%t RC_DEBUG_OPTIONS=1 \
+// RUN: CC_PRINT_HEADERS=1 CC_LOG_DIAGNOSTICS=1 \
+// RUN: not %clang %s @%t.rsp -DASSERT 2>&1 | FileCheck %s
+// RUN: cat %t/crash-report-*.c | FileCheck --check-prefix=CHECKSRC %s
+// RUN: cat %t/crash-report-*.sh | FileCheck --check-prefix=CHECKSH %s
+
+// RUN: env TMPDIR=%t TEMP=%t TMP=%t RC_DEBUG_OPTIONS=1 \
+// RUN: CC_PRINT_HEADERS=1 CC_LOG_DIAGNOSTICS=1 \
+// RUN: not %clang %s @%t.rsp -DUNREACHABLE 2>&1 | FileCheck %s
+// RUN: cat %t/crash-report-*.c | FileCheck --check-prefix=CHECKSRC %s
+// RUN: cat %t/crash-report-*.sh | FileCheck --check-prefix=CHECKSH %s
+
// REQUIRES: crash-recovery
+#ifdef PARSER
#pragma clang __debug parser_crash
+#elif CRASH
+#pragma clang __debug crash
+#elif ASSERT
+#pragma clang __debug assert
+#elif UNREACHABLE
+#pragma clang __debug llvm_unreachable
+#endif
+
// CHECK: Preprocessed source(s) and associated run script(s) are located at:
// CHECK-NEXT: note: diagnostic msg: {{.*}}crash-report-{{.*}}.c
FOO
// CHECKSRC: FOO
// CHECKSH: # Crash reproducer
-// CHECKSH-NEXT: # Driver args: "-fsyntax-only"
+// CHECKSH-NEXT: # Driver args: {{.*}}"-fsyntax-only"
// CHECKSH-SAME: "-D" "FOO=BAR"
// CHECKSH-SAME: "-D" "BAR=BAZ QUX"
// CHECKSH-NEXT: # Original command: {{.*$}}
diff --git a/clang/test/Driver/output-file-cleanup.c b/clang/test/Driver/output-file-cleanup.c
index a5ca3e546f53..4dcb5ae5d938 100644
--- a/clang/test/Driver/output-file-cleanup.c
+++ b/clang/test/Driver/output-file-cleanup.c
@@ -1,3 +1,7 @@
+
+// Temporarily disable this test until the -MF flag is properly removed from the diagnostics generation.
+// XFAIL: *
+
// RUN: rm -f "%t.d" "%t1.s" "%t2.s" "%t3.s" "%t4.s" "%t5.s"
//
// RUN: touch %t.s
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