Revert of Turned on SkSL->GLSL compiler (patchset #48 id:1220001 of https://codereview.chromium.org/2288033003/ )

Reason for revert:
https://build.chromium.org/p/chromium/builders/Linux%20x64/builds/26798

Original issue's description:
> Turned on SkSL->GLSL compiler
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2288033003
>
> Committed: https://skia.googlesource.com/skia/+/9b0fe3d125f237d9884732a48414fa85fc71b4e3
> Committed: https://skia.googlesource.com/skia/+/b12b3c6908c62c908b3680be01e3b5bfd30de310
> Committed: https://skia.googlesource.com/skia/+/f008b0a59f45c0d4bea3e66faf3b01805009ec89
> Committed: https://skia.googlesource.com/skia/+/08b2ccf398e2b81bc05d2c105837e5419899469b
> Committed: https://skia.googlesource.com/skia/+/dcfe6dba4a335e50e86ff68e3252065d4197432c

TBR=benjaminwagner@google.com,bsalomon@google.com,egdaniel@google.com,ethannicholas@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2408053002

6 files changed, 16 insertions, 77 deletions

diff --git a/src/sksl/ir/SkSLIndexExpression.h b/src/sksl/ir/SkSLIndexExpression.h
index ea9af3d897..f5b0d09c2c 100644
--- a/src/sksl/ir/SkSLIndexExpression.h
+++ b/src/sksl/ir/SkSLIndexExpression.h
@@ -19,7 +19,7 @@ namespace SkSL {
 static const Type& index_type(const Context& context, const Type& type) {
     if (type.kind() == Type::kMatrix_Kind) {
         if (type.componentType() == *context.fFloat_Type) {
-            switch (type.rows()) {
+            switch (type.columns()) {
                 case 2: return *context.fVec2_Type;
                 case 3: return *context.fVec3_Type;
                 case 4: return *context.fVec4_Type;
@@ -27,7 +27,7 @@ static const Type& index_type(const Context& context, const Type& type) {
             }
         } else {
             ASSERT(type.componentType() == *context.fDouble_Type);
-            switch (type.rows()) {
+            switch (type.columns()) {
                 case 2: return *context.fDVec2_Type;
                 case 3: return *context.fDVec3_Type;
                 case 4: return *context.fDVec4_Type;
@@ -47,7 +47,7 @@ struct IndexExpression : public Expression {
     : INHERITED(base->fPosition, kIndex_Kind, index_type(context, base->fType))
     , fBase(std::move(base))
     , fIndex(std::move(index)) {
-        ASSERT(fIndex->fType == *context.fInt_Type || fIndex->fType == *context.fUInt_Type);
+        ASSERT(fIndex->fType == *context.fInt_Type);
     }
 
     std::string description() const override {
diff --git a/src/sksl/ir/SkSLIntLiteral.h b/src/sksl/ir/SkSLIntLiteral.h
index 8921c283b5..2bc565712e 100644
--- a/src/sksl/ir/SkSLIntLiteral.h
+++ b/src/sksl/ir/SkSLIntLiteral.h
@@ -18,8 +18,8 @@ namespace SkSL {
 struct IntLiteral : public Expression {
     // FIXME: we will need to revisit this if/when we add full support for both signed and unsigned
     // 64-bit integers, but for right now an int64_t will hold every value we care about
-    IntLiteral(const Context& context, Position position, int64_t value, const Type* type = nullptr)
-    : INHERITED(position, kIntLiteral_Kind, type ? *type : *context.fInt_Type)
+    IntLiteral(const Context& context, Position position, int64_t value)
+    : INHERITED(position, kIntLiteral_Kind, *context.fInt_Type)
     , fValue(value) {}
 
     virtual std::string description() const override {
diff --git a/src/sksl/ir/SkSLLayout.h b/src/sksl/ir/SkSLLayout.h
index 24087d0612..d8dc98096f 100644
--- a/src/sksl/ir/SkSLLayout.h
+++ b/src/sksl/ir/SkSLLayout.h
@@ -22,20 +22,15 @@ struct Layout {
     , fIndex(layout.fIndex)
     , fSet(layout.fSet)
     , fBuiltin(layout.fBuiltin)
-    , fOriginUpperLeft(layout.fOriginUpperLeft)
-    , fOverrideCoverage(layout.fOverrideCoverage)
-    , fBlendSupportAllEquations(layout.fBlendSupportAllEquations) {}
+    , fOriginUpperLeft(layout.fOriginUpperLeft) {}
 
-    Layout(int location, int binding, int index, int set, int builtin, bool originUpperLeft,
-           bool overrideCoverage, bool blendSupportAllEquations)
+    Layout(int location, int binding, int index, int set, int builtin, bool originUpperLeft)
     : fLocation(location)
     , fBinding(binding)
     , fIndex(index)
     , fSet(set)
     , fBuiltin(builtin)
-    , fOriginUpperLeft(originUpperLeft)
-    , fOverrideCoverage(overrideCoverage)
-    , fBlendSupportAllEquations(blendSupportAllEquations) {}
+    , fOriginUpperLeft(originUpperLeft) {}
 
     std::string description() const {
         std::string result;
@@ -64,14 +59,6 @@ struct Layout {
             result += separator + "origin_upper_left";
             separator = ", ";
         }
-        if (fOverrideCoverage) {
-            result += separator + "override_coverage";
-            separator = ", ";
-        }
-        if (fBlendSupportAllEquations) {
-            result += separator + "blend_support_all_equations";
-            separator = ", ";
-        }
         if (result.length() > 0) {
             result = "layout (" + result + ")";
         }
@@ -79,14 +66,11 @@ struct Layout {
     }
 
     bool operator==(const Layout& other) const {
-        return fLocation                 == other.fLocation &&
-               fBinding                  == other.fBinding &&
-               fIndex                    == other.fIndex &&
-               fSet                      == other.fSet &&
-               fBuiltin                  == other.fBuiltin &&
-               fOriginUpperLeft          == other.fOriginUpperLeft &&
-               fOverrideCoverage         == other.fOverrideCoverage &&
-               fBlendSupportAllEquations == other.fBlendSupportAllEquations;
+        return fLocation == other.fLocation &&
+               fBinding  == other.fBinding &&
+               fIndex    == other.fIndex &&
+               fSet      == other.fSet &&
+               fBuiltin  == other.fBuiltin;
     }
 
     bool operator!=(const Layout& other) const {
@@ -101,8 +85,6 @@ struct Layout {
     int fSet;
     int fBuiltin;
     bool fOriginUpperLeft;
-    bool fOverrideCoverage;
-    bool fBlendSupportAllEquations;
 };
 
 } // namespace
diff --git a/src/sksl/ir/SkSLModifiersDeclaration.h b/src/sksl/ir/SkSLModifiersDeclaration.h
deleted file mode 100644
index 0066fab877..0000000000
--- a/src/sksl/ir/SkSLModifiersDeclaration.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- 
-#ifndef SKSL_MODIFIERDECLARATION
-#define SKSL_MODIFIERDECLARATION
-
-#include "SkSLProgramElement.h"
-#include "SkSLModifiers.h"
-
-namespace SkSL {
-
-/**
- * A declaration that consists only of modifiers, e.g.:
- *
- * layout(blend_support_all_equations) out;
- */
-struct ModifiersDeclaration : public ProgramElement {
-    ModifiersDeclaration(Modifiers modifiers)
-    : INHERITED(Position(), kModifiers_Kind)
-    , fModifiers(modifiers) {}
-
-    std::string description() const {
-        return fModifiers.description() + ";";
-    }
-
-    Modifiers fModifiers;
-
-    typedef ProgramElement INHERITED;
-};
-
-} // namespace
-
-#endif
diff --git a/src/sksl/ir/SkSLProgram.h b/src/sksl/ir/SkSLProgram.h
index 8393341269..205db6e932 100644
--- a/src/sksl/ir/SkSLProgram.h
+++ b/src/sksl/ir/SkSLProgram.h
@@ -11,7 +11,6 @@
 #include <vector>
 #include <memory>
 
-#include "SkSLModifiers.h"
 #include "SkSLProgramElement.h"
 #include "SkSLSymbolTable.h"
 
@@ -26,18 +25,14 @@ struct Program {
         kVertex_Kind
     };
 
-    Program(Kind kind, 
-            Modifiers::Flag defaultPrecision,
-            std::vector<std::unique_ptr<ProgramElement>> elements, 
+    Program(Kind kind, std::vector<std::unique_ptr<ProgramElement>> elements, 
             std::shared_ptr<SymbolTable> symbols)
     : fKind(kind) 
-    , fDefaultPrecision(defaultPrecision)
     , fElements(std::move(elements))
     , fSymbols(symbols) {}
 
     Kind fKind;
-    // FIXME handle different types; currently it assumes this is for floats
-    Modifiers::Flag fDefaultPrecision;
+
     std::vector<std::unique_ptr<ProgramElement>> fElements;
     std::shared_ptr<SymbolTable> fSymbols;
 };
diff --git a/src/sksl/ir/SkSLProgramElement.h b/src/sksl/ir/SkSLProgramElement.h
index 2f1ce77199..44fc340667 100644
--- a/src/sksl/ir/SkSLProgramElement.h
+++ b/src/sksl/ir/SkSLProgramElement.h
@@ -20,8 +20,7 @@ struct ProgramElement : public IRNode {
         kVar_Kind,
         kFunction_Kind,
         kInterfaceBlock_Kind,
-        kExtension_Kind,
-        kModifiers_Kind
+        kExtension_Kind
     };
 
     ProgramElement(Position position, Kind kind)