jcai19 updated this revision to Diff 261740.
jcai19 added a comment.
Issue a warning when the proposed flag is used.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D77168/new/
https://reviews.llvm.org/D77168
Files:
clang/include/clang/Basic/DiagnosticDriverKinds.td
clang/include/clang/Basic/LangOptions.def
clang/include/clang/Driver/Options.td
clang/lib/CodeGen/CGBuiltin.cpp
clang/lib/CodeGen/CGDecl.cpp
clang/lib/CodeGen/CodeGenModule.h
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/test/CodeGenCXX/auto-var-init-stop-after.cpp
clang/test/Driver/clang_f_opts.c
Index: clang/test/Driver/clang_f_opts.c
===================================================================
--- clang/test/Driver/clang_f_opts.c
+++ clang/test/Driver/clang_f_opts.c
@@ -571,8 +571,8 @@
// CHECK-RECORD-GCC-SWITCHES-ESCAPED: "-record-command-line" "{{.+}}with\\ spaces{{.+}}"
// RUN: %clang -### -S -ftrivial-auto-var-init=uninitialized %s 2>&1 | FileCheck -check-prefix=CHECK-TRIVIAL-UNINIT %s
-// RUN: %clang -### -S -ftrivial-auto-var-init=pattern %s 2>&1 | FileCheck -check-prefix=CHECK-TRIVIAL-PATTERN %s
-// RUN: %clang -### -S -ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang %s 2>&1 | FileCheck -check-prefix=CHECK-TRIVIAL-ZERO-GOOD %s
+// RUN: %clang -### -S -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-stop-after=1 %s 2>&1 | FileCheck -check-prefix=CHECK-TRIVIAL-PATTERN %s
+// RUN: %clang -### -S -ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang -ftrivial-auto-var-init-stop-after=1 %s 2>&1 | FileCheck -check-prefix=CHECK-TRIVIAL-ZERO-GOOD %s
// RUN: %clang -### -S -ftrivial-auto-var-init=zero %s 2>&1 | FileCheck -check-prefix=CHECK-TRIVIAL-ZERO-BAD %s
// CHECK-TRIVIAL-UNINIT-NOT: hasn't been enabled
// CHECK-TRIVIAL-PATTERN-NOT: hasn't been enabled
Index: clang/test/CodeGenCXX/auto-var-init-stop-after.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGenCXX/auto-var-init-stop-after.cpp
@@ -0,0 +1,29 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-stop-after=2 %s -emit-llvm -o - | FileCheck %s -check-prefix=PATTERN-STOP-AFTER-2
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-stop-after=3 %s -emit-llvm -o - | FileCheck %s -check-prefix=PATTERN-STOP-AFTER-3
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-stop-after=4 %s -emit-llvm -o - | FileCheck %s -check-prefix=PATTERN-STOP-AFTER-4
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=zero -ftrivial-auto-var-init-stop-after=2 %s -emit-llvm -o - | FileCheck %s -check-prefix=ZERO-STOP-AFTER-2
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=zero -ftrivial-auto-var-init-stop-after=3 %s -emit-llvm -o - | FileCheck %s -check-prefix=ZERO-STOP-AFTER-3
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=zero -ftrivial-auto-var-init-stop-after=4 %s -emit-llvm -o - | FileCheck %s -check-prefix=ZERO-STOP-AFTER-4
+
+#define ARRLEN 10
+
+typedef struct {
+ int i;
+ char c;
+} S;
+
+int foo(unsigned n) {
+ long a = 888;
+ S arr1[ARRLEN];
+ void *p;
+ p = __builtin_alloca(sizeof(unsigned long long) * n);
+ // PATTERN-STOP-AFTER-2-NOT: store i8* inttoptr (i64 -6148914691236517206 to i8*), i8** %p, align 8
+ // PATTERN-STOP-AFTER-3: store i8* inttoptr (i64 -6148914691236517206 to i8*), i8** %p, align 8
+ // PATTERN-STOP-AFTER-3-NOT: call void @llvm.memset.p0i8.i64(i8* align 16 %2, i8 -86, i64 %mul, i1 false)
+ // PATTERN-STOP-AFTER-4: call void @llvm.memset.p0i8.i64(i8* align 16 %2, i8 -86, i64 %mul, i1 false)
+ // ZERO-STOP-AFTER-2-NOT: store i8* null, i8** %p, align 8
+ // ZERO-STOP-AFTER-3: store i8* null, i8** %p, align 8
+ // ZERO-STOP-AFTER-3-NOT: void @llvm.memset.p0i8.i64(i8* align 16 %2, i8 0, i64 %mul, i1 false)
+ // ZERO-STOP-AFTER-4: void @llvm.memset.p0i8.i64(i8* align 16 %2, i8 0, i64 %mul, i1 false)
+ return 0;
+}
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -3256,6 +3256,11 @@
Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
}
+ if (Arg *A = Args.getLastArg(OPT_ftrivial_auto_var_init_stop_after)) {
+ unsigned Val = (unsigned)std::stoi(A->getValue());
+ Opts.TrivialAutoVarInitStopAfter = Val;
+ }
+
// Parse -fsanitize= arguments.
parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
Diags, Opts.Sanitize);
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3086,6 +3086,15 @@
CmdArgs.push_back(
Args.MakeArgString("-ftrivial-auto-var-init=" + TrivialAutoVarInit));
}
+
+ if (Arg *A =
+ Args.getLastArg(options::OPT_ftrivial_auto_var_init_stop_after)) {
+ D.Diag(diag::warn_drv_trivial_auto_var_init_stop_after_enabled);
+ A->claim();
+ StringRef Val = A->getValue();
+ CmdArgs.push_back(
+ Args.MakeArgString("-ftrivial-auto-var-init-stop-after=" + Val));
+ }
}
static void RenderOpenCLOptions(const ArgList &Args, ArgStringList &CmdArgs) {
Index: clang/lib/CodeGen/CodeGenModule.h
===================================================================
--- clang/lib/CodeGen/CodeGenModule.h
+++ clang/lib/CodeGen/CodeGenModule.h
@@ -302,6 +302,7 @@
const HeaderSearchOptions &HeaderSearchOpts; // Only used for debug info.
const PreprocessorOptions &PreprocessorOpts; // Only used for debug info.
const CodeGenOptions &CodeGenOpts;
+ unsigned NumAutoVarInit = 0;
llvm::Module &TheModule;
DiagnosticsEngine &Diags;
const TargetInfo &Target;
@@ -1382,6 +1383,16 @@
/// \param QT is the clang QualType of the null pointer.
llvm::Constant *getNullPointer(llvm::PointerType *T, QualType QT);
+ bool stopAutoInit() {
+ unsigned StopAfter = getContext().getLangOpts().TrivialAutoVarInitStopAfter;
+ if (StopAfter) {
+ if (NumAutoVarInit >= StopAfter)
+ return true;
+ ++NumAutoVarInit;
+ }
+ return false;
+ }
+
private:
llvm::Constant *GetOrCreateLLVMFunction(
StringRef MangledName, llvm::Type *Ty, GlobalDecl D, bool ForVTable,
Index: clang/lib/CodeGen/CGDecl.cpp
===================================================================
--- clang/lib/CodeGen/CGDecl.cpp
+++ clang/lib/CodeGen/CGDecl.cpp
@@ -1679,10 +1679,13 @@
case LangOptions::TrivialAutoVarInitKind::Uninitialized:
llvm_unreachable("Uninitialized handled by caller");
case LangOptions::TrivialAutoVarInitKind::Zero:
- emitStoresForZeroInit(CGM, D, Loc, isVolatile, Builder);
- break;
case LangOptions::TrivialAutoVarInitKind::Pattern:
- emitStoresForPatternInit(CGM, D, Loc, isVolatile, Builder);
+ if (CGM.stopAutoInit())
+ return;
+ if (trivialAutoVarInit == LangOptions::TrivialAutoVarInitKind::Zero)
+ emitStoresForZeroInit(CGM, D, Loc, isVolatile, Builder);
+ else
+ emitStoresForPatternInit(CGM, D, Loc, isVolatile, Builder);
break;
}
return;
Index: clang/lib/CodeGen/CGBuiltin.cpp
===================================================================
--- clang/lib/CodeGen/CGBuiltin.cpp
+++ clang/lib/CodeGen/CGBuiltin.cpp
@@ -75,6 +75,8 @@
break;
}
}
+ if (CGF.CGM.stopAutoInit())
+ return;
CGF.Builder.CreateMemSet(AI, Byte, Size, AlignmentInBytes);
}
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -1828,6 +1828,8 @@
def enable_trivial_var_init_zero : Flag<["-"], "enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang">,
Flags<[CC1Option, CoreOption]>,
HelpText<"Trivial automatic variable initialization to zero is only here for benchmarks, it'll eventually be removed, and I'm OK with that because I'm only using it to benchmark">;
+def ftrivial_auto_var_init_stop_after : Joined<["-"], "ftrivial-auto-var-init-stop-after=">, Group<f_Group>,
+ Flags<[CC1Option, CoreOption]>, HelpText<"Stop initializing trivial automatic stack variables after the specified number of instances">;
def fstandalone_debug : Flag<["-"], "fstandalone-debug">, Group<f_Group>, Flags<[CoreOption]>,
HelpText<"Emit full debug info for all types used by the program">;
def fno_standalone_debug : Flag<["-"], "fno-standalone-debug">, Group<f_Group>, Flags<[CoreOption]>,
Index: clang/include/clang/Basic/LangOptions.def
===================================================================
--- clang/include/clang/Basic/LangOptions.def
+++ clang/include/clang/Basic/LangOptions.def
@@ -295,6 +295,8 @@
"stack protector mode")
ENUM_LANGOPT(TrivialAutoVarInit, TrivialAutoVarInitKind, 2, TrivialAutoVarInitKind::Uninitialized,
"trivial automatic variable initialization")
+VALUE_LANGOPT(TrivialAutoVarInitStopAfter, 32, 0,
+ "stop trivial automatic variable initialization after the specified number of instances. 0 is ignored.")
ENUM_LANGOPT(SignedOverflowBehavior, SignedOverflowBehaviorTy, 2, SOB_Undefined,
"signed integer overflow handling")
Index: clang/include/clang/Basic/DiagnosticDriverKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -484,6 +484,11 @@
"-ftrivial-auto-var-init=zero hasn't been enabled. Enable it at your own peril for benchmarking purpose only with "
"-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang">;
+def warn_drv_trivial_auto_var_init_stop_after_enabled : Warning<
+ "-ftrivial-auto-var-init-stop-after=* has been enabled to limit the number of times ftrivial-auto-var-init=zero/pattern gets applied.">,
+ InGroup<DiagGroup<"trivial-auto-var-init-stop-after">>;
+
+
def warn_drv_msp430_hwmult_unsupported : Warning<"the given MCU does not "
"support hardware multiply, but -mhwmult is set to %0.">,
InGroup<InvalidCommandLineArgument>;
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