Summary: Currently there is no way to disable deprecated warning from asm like this

clang  -target arm deprecated-asm.s -c
  deprecated-asm.s:30:9: warning: use of SP or PC in the list is deprecated
       stmia   r4!, {r12-r14}

We have to have an option what can disable it.

Patched by Yin Ma!

Reviewers: joey, echristo, weimingz

Subscribers: llvm-commits, aemerson

Differential Revision: https://reviews.llvm.org/D27219

llvm-svn: 288734

include/llvm/MC/MCTargetOptions.h

@@ -38,6 +38,7 @@ public:
   bool MCNoExecStack : 1;
   bool MCFatalWarnings : 1;
   bool MCNoWarn : 1;
+  bool MCNoDeprecatedWarn : 1;
   bool MCSaveTempLabels : 1;
   bool MCUseDwarfDirectory : 1;
   bool MCIncrementalLinkerCompatible : 1;
@@ -65,6 +66,7 @@ inline bool operator==(const MCTargetOptions &LHS, const MCTargetOptions &RHS) {
           ARE_EQUAL(MCNoExecStack) &&
           ARE_EQUAL(MCFatalWarnings) &&
           ARE_EQUAL(MCNoWarn) &&
+          ARE_EQUAL(MCNoDeprecatedWarn) &&
           ARE_EQUAL(MCSaveTempLabels) &&
           ARE_EQUAL(MCUseDwarfDirectory) &&
           ARE_EQUAL(MCIncrementalLinkerCompatible) &&

include/llvm/MC/MCTargetOptionsCommandFlags.h

@@ -53,6 +53,9 @@ cl::opt<bool> FatalWarnings("fatal-warnings",
 cl::opt<bool> NoWarn("no-warn", cl::desc("Suppress all warnings"));
 cl::alias NoWarnW("W", cl::desc("Alias for --no-warn"), cl::aliasopt(NoWarn));
 
+cl::opt<bool> NoDeprecatedWarn("no-deprecated-warn",
+                               cl::desc("Suppress all deprecated warnings"));
+
 cl::opt<std::string>
 ABIName("target-abi", cl::Hidden,
         cl::desc("The name of the ABI to be targeted from the backend."),
@@ -70,6 +73,7 @@ static inline MCTargetOptions InitMCTargetOptionsFromFlags() {
   Options.ABIName = ABIName;
   Options.MCFatalWarnings = FatalWarnings;
   Options.MCNoWarn = NoWarn;
+  Options.MCNoDeprecatedWarn = NoDeprecatedWarn;
   return Options;
 }
 

lib/MC/MCTargetOptions.cpp

@@ -14,7 +14,8 @@ namespace llvm {
 
 MCTargetOptions::MCTargetOptions()
     : SanitizeAddress(false), MCRelaxAll(false), MCNoExecStack(false),
-      MCFatalWarnings(false), MCNoWarn(false), MCSaveTempLabels(false),
+      MCFatalWarnings(false), MCNoWarn(false), MCNoDeprecatedWarn(false),
+      MCSaveTempLabels(false),
       MCUseDwarfDirectory(false), MCIncrementalLinkerCompatible(false),
       MCPIECopyRelocations(false), ShowMCEncoding(false),
       ShowMCInst(false), AsmVerbose(false),

test/CodeGen/ARM/deprecated-asm.s

@@ -0,0 +1,43 @@
+// REQUIRES: asserts
+// RUN: llvm-mc < %s  -triple=armv4t-linux-gnueabi -filetype=obj -o %t.o -no-deprecated-warn -stats 2>&1 | FileCheck %s
+// RUN: llvm-mc < %s  -triple=armv4t-linux-gnueabi -filetype=obj -o %t.o 2>&1 | FileCheck %s -check-prefix=WARN
+
+	.text
+	.syntax unified
+	.eabi_attribute	67, "2.09"	@ Tag_conformance
+	.cpu	arm7tdmi
+	.eabi_attribute	6, 2	@ Tag_CPU_arch
+	.eabi_attribute	8, 1	@ Tag_ARM_ISA_use
+	.eabi_attribute	17, 1	@ Tag_ABI_PCS_GOT_use
+	.eabi_attribute	20, 1	@ Tag_ABI_FP_denormal
+	.eabi_attribute	21, 1	@ Tag_ABI_FP_exceptions
+	.eabi_attribute	23, 3	@ Tag_ABI_FP_number_model
+	.eabi_attribute	34, 0	@ Tag_CPU_unaligned_access
+	.eabi_attribute	24, 1	@ Tag_ABI_align_needed
+	.eabi_attribute	25, 1	@ Tag_ABI_align_preserved
+	.eabi_attribute	38, 1	@ Tag_ABI_FP_16bit_format
+	.eabi_attribute	18, 4	@ Tag_ABI_PCS_wchar_t
+	.eabi_attribute	26, 2	@ Tag_ABI_enum_size
+	.eabi_attribute	14, 0	@ Tag_ABI_PCS_R9_use
+	.file	"t.c"
+	.globl	foo
+	.p2align	2
+	.type	foo,%function
+foo:                                    @ @foo
+	.fnstart
+@ BB#0:                                 @ %entry
+	mov	r0, #0
+	bx	lr
+        stmia   r4!, {r12-r14}
+.Lfunc_end0:
+.Ltmp0:
+	.size	foo, .Ltmp0-foo
+	.cantunwind
+	.fnend
+
+
+
+// CHECK: Statistic
+// CHECK-NOT: warning
+
+// WARN: warning

utils/TableGen/AsmMatcherEmitter.cpp

@@ -3199,7 +3199,9 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
 
   if (HasDeprecation) {
     OS << "    std::string Info;\n";
-    OS << "    if (MII.get(Inst.getOpcode()).getDeprecatedInfo(Inst, getSTI(), Info)) {\n";
+    OS << "    if (!getParser().getTargetParser().\n";
+    OS << "        getTargetOptions().MCNoDeprecatedWarn &&\n";
+    OS << "        MII.get(Inst.getOpcode()).getDeprecatedInfo(Inst, getSTI(), Info)) {\n";
     OS << "      SMLoc Loc = ((" << Target.getName()
        << "Operand&)*Operands[0]).getStartLoc();\n";
     OS << "      getParser().Warning(Loc, Info, None);\n";