Revert "Added DSL flags"

This reverts commit 71430593f0657be374c0f3b73065f7b1765a97cf.

Reason for revert: Clang-tidy bot unhappy. (Not sure how this slipped by).

Original change's description:
> Added DSL flags
>
> This adds some basic flags to the DSL initialization which allows us to
> toggle things like optimization and validation.
>
> Change-Id: I35b10526af1678c88901eaacd5a2c4a9f5cd21a7
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/406896
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: John Stiles <johnstiles@google.com>

TBR=brianosman@google.com,ethannicholas@google.com,johnstiles@google.com

Change-Id: I7512b8bcc6e94707949904eec42c396faa7fdaf8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/407176
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/include/sksl/DSLCore.h b/include/sksl/DSLCore.h
index 62ac361..5b43ed1 100644
--- a/include/sksl/DSLCore.h
+++ b/include/sksl/DSLCore.h
@@ -32,22 +32,11 @@
 // shouldn't pollute the SkSL::dsl namespace with anything else.
 using namespace SkSL::SwizzleComponent;
 
-enum DSLFlag {
-    kNo_Flag               = 0,
-    kMangle_Flag           = 1 << 0,
-    kOptimize_Flag         = 1 << 1,
-    kValidate_Flag         = 1 << 2,
-    kMarkVarsDeclared_Flag = 1 << 3,
-};
-
-constexpr int kDefaultDSLFlags = kMangle_Flag | kOptimize_Flag | kValidate_Flag;
-
 /**
  * Starts DSL output on the current thread using the specified compiler. This must be called
  * prior to any other DSL functions.
  */
-void Start(SkSL::Compiler* compiler, SkSL::ProgramKind kind = SkSL::ProgramKind::kFragment,
-           int flags = kDefaultDSLFlags);
+void Start(SkSL::Compiler* compiler, SkSL::ProgramKind kind = SkSL::ProgramKind::kFragment);
 
 /**
  * Signals the end of DSL output. This must be called sometime between a call to Start() and the
diff --git a/src/sksl/dsl/DSLCore.cpp b/src/sksl/dsl/DSLCore.cpp
index 3c71b18..cfaaecf 100644
--- a/src/sksl/dsl/DSLCore.cpp
+++ b/src/sksl/dsl/DSLCore.cpp
@@ -25,8 +25,8 @@
 
 namespace dsl {
 
-void Start(SkSL::Compiler* compiler, ProgramKind kind, int flags) {
-    DSLWriter::SetInstance(std::make_unique<DSLWriter>(compiler, kind, flags));
+void Start(SkSL::Compiler* compiler, ProgramKind kind) {
+    DSLWriter::SetInstance(std::make_unique<DSLWriter>(compiler, kind));
 }
 
 void End() {
diff --git a/src/sksl/dsl/priv/DSLWriter.cpp b/src/sksl/dsl/priv/DSLWriter.cpp
index ed15fd8..7af36d8 100644
--- a/src/sksl/dsl/priv/DSLWriter.cpp
+++ b/src/sksl/dsl/priv/DSLWriter.cpp
@@ -31,10 +31,8 @@
 
 namespace dsl {
 
-DSLWriter::DSLWriter(SkSL::Compiler* compiler, SkSL::ProgramKind kind, int flags)
-    : fCompiler(compiler)
-    , fMangle(flags & kMangle_Flag)
-    , fMarkVarsDeclared(flags & kMarkVarsDeclared_Flag) {
+DSLWriter::DSLWriter(SkSL::Compiler* compiler, SkSL::ProgramKind kind)
+    : fCompiler(compiler) {
     SkSL::ParsedModule module = fCompiler->moduleForProgramKind(kind);
 
     fModifiersPool = std::make_unique<ModifiersPool>();
@@ -43,8 +41,6 @@
 
     fConfig = std::make_unique<ProgramConfig>();
     fConfig->fKind = kind;
-    fConfig->fSettings.fOptimize = flags & kOptimize_Flag;
-    fConfig->fSettings.fValidateSPIRV = flags & kValidate_Flag;
     fOldConfig = fCompiler->fContext->fConfig;
     fCompiler->fContext->fConfig = fConfig.get();
 
diff --git a/src/sksl/dsl/priv/DSLWriter.h b/src/sksl/dsl/priv/DSLWriter.h
index 8e8af4b..fa79fdd 100644
--- a/src/sksl/dsl/priv/DSLWriter.h
+++ b/src/sksl/dsl/priv/DSLWriter.h
@@ -44,7 +44,7 @@
  */
 class DSLWriter {
 public:
-    DSLWriter(SkSL::Compiler* compiler, SkSL::ProgramKind kind, int flags);
+    DSLWriter(SkSL::Compiler* compiler, SkSL::ProgramKind kind);
 
     ~DSLWriter();
 
@@ -242,6 +242,7 @@
 
     friend class DSLCore;
     friend class DSLVar;
+    friend class ::AutoDSLContext;
 };
 
 } // namespace dsl
diff --git a/tests/SkSLDSLTest.cpp b/tests/SkSLDSLTest.cpp
index 874063e..bd07534 100644
--- a/tests/SkSLDSLTest.cpp
+++ b/tests/SkSLDSLTest.cpp
@@ -18,9 +18,6 @@
 
 using namespace SkSL::dsl;
 
-constexpr int kDefaultTestFlags = (kDefaultDSLFlags & ~kMangle_Flag) | kMarkVarsDeclared_Flag;
-constexpr int kNoDeclareTestFlags = kDefaultDSLFlags & ~kMangle_Flag;
-
 /**
  * In addition to issuing an automatic Start() and End(), disables mangling and optionally
  * auto-declares variables during its lifetime. Variable auto-declaration simplifies testing so we
@@ -30,9 +27,11 @@
  */
 class AutoDSLContext {
 public:
-    AutoDSLContext(GrGpu* gpu, int flags = kDefaultTestFlags,
+    AutoDSLContext(GrGpu* gpu, bool markVarsDeclared = true,
                    SkSL::ProgramKind kind = SkSL::ProgramKind::kFragment) {
-        Start(gpu->shaderCompiler(), kind, flags);
+        Start(gpu->shaderCompiler(), kind);
+        DSLWriter::Instance().fMangle = false;
+        DSLWriter::Instance().fMarkVarsDeclared = markVarsDeclared;
     }
 
     ~AutoDSLContext() {
@@ -135,28 +134,6 @@
 
 #define EXPECT_EQUAL(a, b)  expect_equal(r, __LINE__, (a), (b))
 
-DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLFlags, r, ctxInfo) {
-    {
-        AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kOptimize_Flag);
-        EXPECT_EQUAL(All(GreaterThan(Float4(1), Float4(0))), "true");
-
-        Var x(kInt_Type, "x");
-        EXPECT_EQUAL(Declare(x), "int x;");
-    }
-
-    {
-        AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNo_Flag);
-        EXPECT_EQUAL(All(GreaterThan(Float4(1), Float4(0))),
-                     "all(greaterThan(float4(1.0), float4(0.0)))");
-    }
-
-    {
-        AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kMangle_Flag);
-        Var x(kInt_Type, "x");
-        EXPECT_EQUAL(Declare(x), "int _0_x;");
-    }
-}
-
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLFloat, r, ctxInfo) {
     AutoDSLContext context(ctxInfo.directContext()->priv().getGpu());
     Expression e1 = Float(std::numeric_limits<float>::max());
@@ -1228,7 +1205,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLBlock, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     EXPECT_EQUAL(Block(), "{ }");
     Var a(kInt_Type, "a", 1), b(kInt_Type, "b", 2);
     EXPECT_EQUAL(Block(Declare(a), Declare(b), a = b), "{ int a = 1; int b = 2; (a = b); }");
@@ -1242,7 +1219,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLBreak, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     Var i(kInt_Type, "i", 0);
     DSLFunction(kVoid_Type, "success").define(
         For(Declare(i), i < 10, ++i, Block(
@@ -1262,7 +1239,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLContinue, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     Var i(kInt_Type, "i", 0);
     DSLFunction(kVoid_Type, "success").define(
         For(Declare(i), i < 10, ++i, Block(
@@ -1282,7 +1259,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLDeclare, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     Var a(kHalf4_Type, "a"), b(kHalf4_Type, "b", Half4(1));
     Statement x = Declare(a);
     EXPECT_EQUAL(x, "half4 a;");
@@ -1310,7 +1287,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLDeclareGlobal, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     Var x(kInt_Type, "x", 0);
     DeclareGlobal(x);
     Var y(kUniform_Modifier, kFloat2_Type, "y");
@@ -1342,7 +1319,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLFor, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     EXPECT_EQUAL(For(Statement(), Expression(), Expression(), Block()),
                 "for (;;) {}");
 
@@ -1372,7 +1349,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLFunction, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
     Var coords(kFloat2_Type, "coords");
     DSLFunction(kVoid_Type, "main", coords).define(
         sk_FragColor() = Half4(coords, 0, 1)
@@ -1599,7 +1576,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLSwizzle, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kDefaultTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu());
     Var a(kFloat4_Type, "a");
 
     EXPECT_EQUAL(a.x(),
@@ -1632,7 +1609,7 @@
 
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLVarSwap, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
 
     // We should be able to convert `a` into a proper var by swapping it, even from within a scope.
     Var a;
@@ -1744,7 +1721,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLModifiers, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
 
     Var v1(kConst_Modifier, kInt_Type, "v1", 0);
     Statement d1 = Declare(v1);
@@ -1876,7 +1853,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLSampleFragmentProcessor, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kDefaultTestFlags,
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/true,
                            SkSL::ProgramKind::kFragmentProcessor);
     DSLVar child(kUniform_Modifier, kFragmentProcessor_Type, "child");
     EXPECT_EQUAL(Sample(child), "sample(child)");
@@ -1891,7 +1868,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLSampleShader, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kDefaultTestFlags,
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/true,
                            SkSL::ProgramKind::kRuntimeShader);
     DSLVar shader(kUniform_Modifier, kShader_Type, "shader");
     EXPECT_EQUAL(Sample(shader, Float2(0, 0)), "sample(shader, float2(0.0, 0.0))");
@@ -1903,7 +1880,7 @@
 }
 
 DEF_GPUTEST_FOR_MOCK_CONTEXT(DSLStruct, r, ctxInfo) {
-    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), kNoDeclareTestFlags);
+    AutoDSLContext context(ctxInfo.directContext()->priv().getGpu(), /*markVarsDeclared=*/false);
 
     DSLType simpleStruct = Struct("SimpleStruct",
         Field(kFloat_Type, "x"),