This patch enables the usage of constant Enum identifiers within Microsoft...

This patch enables the usage of constant Enum identifiers within Microsoft style inline assembly statements.

Differential Revision:
https://reviews.llvm.org/D33277
https://reviews.llvm.org/D33278



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@308965 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaStmtAsm.cpp

@@ -645,8 +645,8 @@ ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
   // Referring to parameters is not allowed in naked functions.
   if (CheckNakedParmReference(Result.get(), *this))
     return ExprError();
-
-  QualType T = Result.get()->getType();
+  Expr *Res = Result.get();
+  QualType T = Res->getType();
 
   if (T->isDependentType()) {
     return Result;
@@ -658,16 +658,26 @@ ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
   }
 
   // Otherwise, it needs to be a complete type.
-  if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
+  if (RequireCompleteExprType(Res, diag::err_asm_incomplete_type)) {
     return ExprError();
   }
 
   fillInlineAsmTypeInfo(Context, T, Info);
 
   // We can work with the expression as long as it's not an r-value.
-  if (!Result.get()->isRValue())
-    Info.IsVarDecl = true;
+  if (!Res->isRValue()) {
+    Info.setKindVariable();
+    return Result;
+  }
 
+  Expr::EvalResult EvlResult;
+  // Try to evaluate the identifier as enum constant, currently we do not allow
+  // other constant integers to be folded.
+  if (isa<clang::EnumType>(T) &&
+    Res->EvaluateAsRValue(EvlResult, getASTContext())) {
+    Info.ConstIntValue = EvlResult.Val.getInt();
+    Info.setKindConstEnum();
+  }
   return Result;
 }
 
@@ -774,7 +784,7 @@ Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member,
   fillInlineAsmTypeInfo(Context, Result.get()->getType(), Info);
 
   // Fields are "variables" as far as inline assembly is concerned.
-  Info.IsVarDecl = true;
+  Info.setKindVariable();
 
   return Result;
 }

test/CodeGen/ms-inline-asm.c

@@ -42,7 +42,7 @@ void t5(void) {
 void t6(void) {
   __asm int 0x2c
 // CHECK: t6
-// CHECK: call void asm sideeffect inteldialect "int $$0x2c", "~{dirflag},~{fpsr},~{flags}"()
+// CHECK: call void asm sideeffect inteldialect "int $$44", "~{dirflag},~{fpsr},~{flags}"()
 }
 
 void t7() {
@@ -61,7 +61,7 @@ void t7() {
     mov eax, ebx
   }
 // CHECK: t7
-// CHECK: call void asm sideeffect inteldialect "int $$0x2cU", "~{dirflag},~{fpsr},~{flags}"()
+// CHECK: call void asm sideeffect inteldialect "int $$44", "~{dirflag},~{fpsr},~{flags}"()
 // CHECK: call void asm sideeffect inteldialect "", "~{dirflag},~{fpsr},~{flags}"()
 // CHECK: call void asm sideeffect inteldialect "mov eax, ebx", "~{eax},~{dirflag},~{fpsr},~{flags}"()
 }
@@ -94,7 +94,7 @@ void t9() {
 // CHECK: t9
 // CHECK: call void asm sideeffect inteldialect
 // CHECK-SAME: push ebx
-// CHECK-SAME: mov ebx, $$0x07
+// CHECK-SAME: mov ebx, $$7
 // CHECK-SAME: pop ebx
 // CHECK-SAME: "~{ebx},~{esp},~{dirflag},~{fpsr},~{flags}"()
 }
@@ -265,7 +265,7 @@ void t21() {
 // CHECK: t21
 // CHECK: call void asm sideeffect inteldialect
 // CHECK-SAME: push ebx
-// CHECK-SAME: mov ebx, $$07H
+// CHECK-SAME: mov ebx, $$7
 // CHECK-SAME: pop ebx
 // CHECK-SAME: "~{ebx},~{esp},~{dirflag},~{fpsr},~{flags}"()
 }
@@ -312,13 +312,13 @@ void t24() {
 void t25() {
 // CHECK: t25
   __asm mov eax, 0ffffffffh
-// CHECK: mov eax, $$0ffffffffh
+// CHECK: mov eax, $$4294967295
   __asm mov eax, 0fhU
 // CHECK: mov eax, $$15
   __asm mov eax, 0a2h
-// CHECK: mov eax, $$0a2h
+// CHECK: mov eax, $$162
   __asm mov eax, 10100010b
-// CHECK: mov eax, $$10100010b
+// CHECK: mov eax, $$162
   __asm mov eax, 10100010BU
 // CHECK: mov eax, $$162
 // CHECK: "~{eax},~{dirflag},~{fpsr},~{flags}"()

test/CodeGen/x86-ms-inline-asm-enum_feature.cpp

+// REQUIRES: x86-registered-target
+// RUN: %clang_cc1 %s -fasm-blocks -emit-llvm -o - | FileCHECK %s
+namespace x {
+enum { A = 12 };
+struct y_t {
+	enum { A = 17 };
+	int r;
+} y;
+}
+// CHECK-LABEL: x86_enum_only
+void x86_enum_only(){
+  const int a = 0;
+  // CHECK-NOT: mov eax, [$$0]
+  // Other constant type folding is currently unwanted.
+  __asm mov eax, [a]
+  }
+
+// CHECK-LABEL: x86_enum_namespaces
+void x86_enum_namespaces() {
+  enum { A = 1 };
+  // CHECK: call void asm
+  // CHECK-SAME: mov eax, $$12
+  __asm mov eax, x::A
+  // CHECK-SAME: mov eax, $$17
+  __asm mov eax, x::y_t::A
+  // CHECK-NEXT: call void asm
+  // CHECK-SAME: mov eax, $$1
+  __asm {mov eax, A}
+}
+
+// CHECK-LABEL: x86_enum_arithmethic
+void x86_enum_arithmethic() {
+  enum { A = 1, B };
+  // CHECK: call void asm
+  // CHECK-SAME: mov eax, $$21
+  __asm mov eax, (A + 9) * 2 + A
+  // CHECK-SAME: mov eax, $$4
+  __asm mov eax, A << 2
+  // CHECK-SAME: mov eax, $$2
+  __asm mov eax, B & 3
+  // CHECK-SAME: mov eax, $$5
+  __asm mov eax, 3 + (B & 3)
+  // CHECK-SAME: mov eax, $$8
+  __asm mov eax, 2 << A * B
+}
+
+// CHECK-LABEL: x86_enum_mem
+void x86_enum_mem() {
+  int arr[4];
+  enum { A = 4, B };
+  // CHECK: call void asm
+  // CHECK-SAME: mov eax, [($$12 + $$9) + $$4 * $$5 + $$3 + $$3 + eax]
+  __asm { mov eax, [(x::A + 9) + A * B + 3 + 3 + eax] }
+  // CHECK-NEXT: call void asm
+  // CHECK-SAME: mov eax, dword ptr $$4$0
+  __asm { mov eax, dword ptr [arr + A] }
+  // CHECK-NEXT: call void asm
+  // CHECK-SAME: mov eax, dword ptr $$8$0
+  __asm { mov eax, dword ptr A[arr + A] }
+}

test/CodeGenCXX/ms-inline-asm-return.cpp

@@ -70,7 +70,7 @@ FourChars f_s4() {
   }
 }
 // CHECK-LABEL: define i32 @f_s4()
-// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$0x01010101", "={eax},~{eax},{{.*}}"
+// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$16843009", "={eax},~{eax},{{.*}}"
 // CHECK: store i32 %[[r]], i32* %{{.*}}
 // CHECK: %[[r_i32:[^ ]*]] = load i32, i32* %{{.*}}
 // CHECK: ret i32 %[[r_i32]]
@@ -85,7 +85,7 @@ EightChars f_s8() {
   }
 }
 // CHECK-LABEL: define i64 @f_s8()
-// CHECK: %[[r:[^ ]*]] = call i64 asm sideeffect inteldialect "mov eax, $$01010101h\0A\09mov edx, $$01010101b", "=A,~{eax},{{.*}}"
+// CHECK: %[[r:[^ ]*]] = call i64 asm sideeffect inteldialect "mov eax, $$16843009\0A\09mov edx, $$85", "=A,~{eax},{{.*}}"
 // CHECK: store i64 %[[r]], i64* %{{.*}}
 // CHECK: %[[r_i64:[^ ]*]] = load i64, i64* %{{.*}}
 // CHECK: ret i64 %[[r_i64]]