// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/tint/resolver/resolver.h"

#include "gmock/gmock.h"
#include "gtest/gtest-spi.h"
#include "src/tint/ast/assignment_statement.h"
#include "src/tint/ast/bitcast_expression.h"
#include "src/tint/ast/break_statement.h"
#include "src/tint/ast/builtin_texture_helper_test.h"
#include "src/tint/ast/call_statement.h"
#include "src/tint/ast/continue_statement.h"
#include "src/tint/ast/discard_statement.h"
#include "src/tint/ast/if_statement.h"
#include "src/tint/ast/loop_statement.h"
#include "src/tint/ast/return_statement.h"
#include "src/tint/ast/stage_attribute.h"
#include "src/tint/ast/switch_statement.h"
#include "src/tint/ast/unary_op_expression.h"
#include "src/tint/ast/variable_decl_statement.h"
#include "src/tint/resolver/resolver_test_helper.h"
#include "src/tint/sem/call.h"
#include "src/tint/sem/function.h"
#include "src/tint/sem/member_accessor_expression.h"
#include "src/tint/sem/sampled_texture.h"
#include "src/tint/sem/statement.h"
#include "src/tint/sem/variable.h"

using ::testing::ElementsAre;
using ::testing::HasSubstr;

namespace tint::resolver {
namespace {

using ResolverValidationTest = ResolverTest;

class FakeStmt final : public Castable<FakeStmt, ast::Statement> {
  public:
    FakeStmt(ProgramID pid, Source src) : Base(pid, src) {}
    FakeStmt* Clone(CloneContext*) const override { return nullptr; }
};

class FakeExpr final : public Castable<FakeExpr, ast::Expression> {
  public:
    FakeExpr(ProgramID pid, Source src) : Base(pid, src) {}
    FakeExpr* Clone(CloneContext*) const override { return nullptr; }
};

TEST_F(ResolverValidationTest, WorkgroupMemoryUsedInVertexStage) {
    Global(Source{{1, 2}}, "wg", ty.vec4<f32>(), ast::StorageClass::kWorkgroup);
    Global("dst", ty.vec4<f32>(), ast::StorageClass::kPrivate);
    auto* stmt = Assign(Expr("dst"), Expr(Source{{3, 4}}, "wg"));

    Func(Source{{9, 10}}, "f0", ast::VariableList{}, ty.vec4<f32>(), {stmt, Return(Expr("dst"))},
         ast::AttributeList{Stage(ast::PipelineStage::kVertex)},
         ast::AttributeList{Builtin(ast::Builtin::kPosition)});

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "3:4 error: workgroup memory cannot be used by vertex pipeline "
              "stage\n1:2 note: variable is declared here");
}

TEST_F(ResolverValidationTest, WorkgroupMemoryUsedInFragmentStage) {
    // var<workgroup> wg : vec4<f32>;
    // var<workgroup> dst : vec4<f32>;
    // fn f2(){ dst = wg; }
    // fn f1() { f2(); }
    // @stage(fragment)
    // fn f0() {
    //  f1();
    //}

    Global(Source{{1, 2}}, "wg", ty.vec4<f32>(), ast::StorageClass::kWorkgroup);
    Global("dst", ty.vec4<f32>(), ast::StorageClass::kPrivate);
    auto* stmt = Assign(Expr("dst"), Expr(Source{{3, 4}}, "wg"));

    Func(Source{{5, 6}}, "f2", {}, ty.void_(), {stmt});
    Func(Source{{7, 8}}, "f1", {}, ty.void_(), {CallStmt(Call("f2"))});
    Func(Source{{9, 10}}, "f0", {}, ty.void_(), {CallStmt(Call("f1"))},
         ast::AttributeList{Stage(ast::PipelineStage::kFragment)});

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(3:4 error: workgroup memory cannot be used by fragment pipeline stage
1:2 note: variable is declared here
5:6 note: called by function 'f2'
7:8 note: called by function 'f1'
9:10 note: called by entry point 'f0')");
}

TEST_F(ResolverValidationTest, UnhandledStmt) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            b.WrapInFunction(b.create<FakeStmt>());
            Program(std::move(b));
        },
        "internal compiler error: unhandled node type: tint::resolver::FakeStmt");
}

TEST_F(ResolverValidationTest, Stmt_If_NonBool) {
    // if (1.23f) {}

    WrapInFunction(If(Expr(Source{{12, 34}}, 1.23f), Block()));

    EXPECT_FALSE(r()->Resolve());

    EXPECT_EQ(r()->error(), "12:34 error: if statement condition must be bool, got f32");
}

TEST_F(ResolverValidationTest, Stmt_ElseIf_NonBool) {
    // else if (1.23f) {}

    WrapInFunction(If(Expr(true), Block(), Else(If(Expr(Source{{12, 34}}, 1.23f), Block()))));

    EXPECT_FALSE(r()->Resolve());

    EXPECT_EQ(r()->error(), "12:34 error: if statement condition must be bool, got f32");
}

TEST_F(ResolverValidationTest, Expr_ErrUnknownExprType) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            b.WrapInFunction(b.create<FakeExpr>());
            Resolver(&b).Resolve();
        },
        "internal compiler error: unhandled expression type: "
        "tint::resolver::FakeExpr");
}

TEST_F(ResolverValidationTest, Expr_DontCall_Function) {
    Func("func", {}, ty.void_(), {}, {});
    WrapInFunction(Expr(Source{{{3, 3}, {3, 8}}}, "func"));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "3:8 error: missing '(' for function call");
}

TEST_F(ResolverValidationTest, Expr_DontCall_Builtin) {
    WrapInFunction(Expr(Source{{{3, 3}, {3, 8}}}, "round"));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "3:8 error: missing '(' for builtin call");
}

TEST_F(ResolverValidationTest, Expr_DontCall_Type) {
    Alias("T", ty.u32());
    WrapInFunction(Expr(Source{{{3, 3}, {3, 8}}}, "T"));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "3:8 error: missing '(' for type constructor or cast");
}

TEST_F(ResolverValidationTest, AssignmentStmt_InvalidLHS_BuiltinFunctionName) {
    // normalize = 2;

    auto* lhs = Expr(Source{{12, 34}}, "normalize");
    auto* rhs = Expr(2);
    auto* assign = Assign(lhs, rhs);
    WrapInFunction(assign);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: missing '(' for builtin call");
}

TEST_F(ResolverValidationTest, UsingUndefinedVariable_Fail) {
    // b = 2;

    auto* lhs = Expr(Source{{12, 34}}, "b");
    auto* rhs = Expr(2);
    auto* assign = Assign(lhs, rhs);
    WrapInFunction(assign);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: unknown identifier: 'b'");
}

TEST_F(ResolverValidationTest, UsingUndefinedVariableInBlockStatement_Fail) {
    // {
    //  b = 2;
    // }

    auto* lhs = Expr(Source{{12, 34}}, "b");
    auto* rhs = Expr(2);

    auto* body = Block(Assign(lhs, rhs));
    WrapInFunction(body);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: unknown identifier: 'b'");
}

TEST_F(ResolverValidationTest, UsingUndefinedVariableGlobalVariable_Pass) {
    // var global_var: f32 = 2.1;
    // fn my_func() {
    //   global_var = 3.14;
    //   return;
    // }

    Global("global_var", ty.f32(), ast::StorageClass::kPrivate, Expr(2.1f));

    Func("my_func", ast::VariableList{}, ty.void_(),
         {
             Assign(Expr(Source{{12, 34}}, "global_var"), 3.14f),
             Return(),
         });

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, UsingUndefinedVariableInnerScope_Fail) {
    // {
    //   if (true) { var a : f32 = 2.0; }
    //   a = 3.14;
    // }
    auto* var = Var("a", ty.f32(), ast::StorageClass::kNone, Expr(2.0f));

    auto* cond = Expr(true);
    auto* body = Block(Decl(var));

    SetSource(Source{{12, 34}});
    auto* lhs = Expr(Source{{12, 34}}, "a");
    auto* rhs = Expr(3.14f);

    auto* outer_body = Block(If(cond, body), Assign(lhs, rhs));

    WrapInFunction(outer_body);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: unknown identifier: 'a'");
}

TEST_F(ResolverValidationTest, UsingUndefinedVariableOuterScope_Pass) {
    // {
    //   var a : f32 = 2.0;
    //   if (true) { a = 3.14; }
    // }
    auto* var = Var("a", ty.f32(), ast::StorageClass::kNone, Expr(2.0f));

    auto* lhs = Expr(Source{{12, 34}}, "a");
    auto* rhs = Expr(3.14f);

    auto* cond = Expr(true);
    auto* body = Block(Assign(lhs, rhs));

    auto* outer_body = Block(Decl(var), If(cond, body));

    WrapInFunction(outer_body);

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, UsingUndefinedVariableDifferentScope_Fail) {
    // {
    //  { var a : f32 = 2.0; }
    //  { a = 3.14; }
    // }
    auto* var = Var("a", ty.f32(), ast::StorageClass::kNone, Expr(2.0f));
    auto* first_body = Block(Decl(var));

    auto* lhs = Expr(Source{{12, 34}}, "a");
    auto* rhs = Expr(3.14f);
    auto* second_body = Block(Assign(lhs, rhs));

    auto* outer_body = Block(first_body, second_body);

    WrapInFunction(outer_body);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: unknown identifier: 'a'");
}

TEST_F(ResolverValidationTest, StorageClass_FunctionVariableWorkgroupClass) {
    auto* var = Var("var", ty.i32(), ast::StorageClass::kWorkgroup);

    auto* stmt = Decl(var);
    Func("func", ast::VariableList{}, ty.void_(), {stmt}, ast::AttributeList{});

    EXPECT_FALSE(r()->Resolve());

    EXPECT_EQ(r()->error(), "error: function variable has a non-function storage class");
}

TEST_F(ResolverValidationTest, StorageClass_FunctionVariableI32) {
    auto* var = Var("s", ty.i32(), ast::StorageClass::kPrivate);

    auto* stmt = Decl(var);
    Func("func", ast::VariableList{}, ty.void_(), {stmt}, ast::AttributeList{});

    EXPECT_FALSE(r()->Resolve());

    EXPECT_EQ(r()->error(), "error: function variable has a non-function storage class");
}

TEST_F(ResolverValidationTest, StorageClass_SamplerExplicitStorageClass) {
    auto* t = ty.sampler(ast::SamplerKind::kSampler);
    Global(Source{{12, 34}}, "var", t, ast::StorageClass::kHandle,
           ast::AttributeList{
               create<ast::BindingAttribute>(0),
               create<ast::GroupAttribute>(0),
           });

    EXPECT_FALSE(r()->Resolve());

    EXPECT_EQ(r()->error(),
              R"(12:34 error: variables of type 'sampler' must not have a storage class)");
}

TEST_F(ResolverValidationTest, StorageClass_TextureExplicitStorageClass) {
    auto* t = ty.sampled_texture(ast::TextureDimension::k1d, ty.f32());
    Global(Source{{12, 34}}, "var", t, ast::StorageClass::kHandle,
           ast::AttributeList{
               create<ast::BindingAttribute>(0),
               create<ast::GroupAttribute>(0),
           });

    EXPECT_FALSE(r()->Resolve()) << r()->error();

    EXPECT_EQ(r()->error(),
              R"(12:34 error: variables of type 'texture_1d<f32>' must not have a storage class)");
}

TEST_F(ResolverValidationTest, Expr_MemberAccessor_VectorSwizzle_BadChar) {
    Global("my_vec", ty.vec3<f32>(), ast::StorageClass::kPrivate);

    auto* ident = Expr(Source{{{3, 3}, {3, 7}}}, "xyqz");

    auto* mem = MemberAccessor("my_vec", ident);
    WrapInFunction(mem);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "3:5 error: invalid vector swizzle character");
}

TEST_F(ResolverValidationTest, Expr_MemberAccessor_VectorSwizzle_MixedChars) {
    Global("my_vec", ty.vec4<f32>(), ast::StorageClass::kPrivate);

    auto* ident = Expr(Source{{{3, 3}, {3, 7}}}, "rgyw");

    auto* mem = MemberAccessor("my_vec", ident);
    WrapInFunction(mem);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "3:3 error: invalid mixing of vector swizzle characters rgba with xyzw");
}

TEST_F(ResolverValidationTest, Expr_MemberAccessor_VectorSwizzle_BadLength) {
    Global("my_vec", ty.vec3<f32>(), ast::StorageClass::kPrivate);

    auto* ident = Expr(Source{{{3, 3}, {3, 8}}}, "zzzzz");
    auto* mem = MemberAccessor("my_vec", ident);
    WrapInFunction(mem);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "3:3 error: invalid vector swizzle size");
}

TEST_F(ResolverValidationTest, Expr_MemberAccessor_VectorSwizzle_BadIndex) {
    Global("my_vec", ty.vec2<f32>(), ast::StorageClass::kPrivate);

    auto* ident = Expr(Source{{3, 3}}, "z");
    auto* mem = MemberAccessor("my_vec", ident);
    WrapInFunction(mem);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "3:3 error: invalid vector swizzle member");
}

TEST_F(ResolverValidationTest, Expr_MemberAccessor_BadParent) {
    // var param: vec4<f32>
    // let ret: f32 = *(&param).x;
    auto* param = Var("param", ty.vec4<f32>());
    auto* x = Expr(Source{{{3, 3}, {3, 8}}}, "x");

    auto* addressOf_expr = AddressOf(Source{{12, 34}}, param);
    auto* accessor_expr = MemberAccessor(addressOf_expr, x);
    auto* star_p = Deref(accessor_expr);
    auto* ret = Var("r", ty.f32(), star_p);
    WrapInFunction(Decl(param), Decl(ret));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: invalid member accessor expression. Expected vector "
              "or struct, got 'ptr<function, vec4<f32>, read_write>'");
}

TEST_F(ResolverValidationTest, EXpr_MemberAccessor_FuncGoodParent) {
    // fn func(p: ptr<function, vec4<f32>>) -> f32 {
    //     let x: f32 = (*p).z;
    //     return x;
    // }
    auto* p = Param("p", ty.pointer(ty.vec4<f32>(), ast::StorageClass::kFunction));
    auto* star_p = Deref(p);
    auto* z = Expr(Source{{{3, 3}, {3, 8}}}, "z");
    auto* accessor_expr = MemberAccessor(star_p, z);
    auto* x = Var("x", ty.f32(), accessor_expr);
    Func("func", {p}, ty.f32(), {Decl(x), Return(x)});
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, EXpr_MemberAccessor_FuncBadParent) {
    // fn func(p: ptr<function, vec4<f32>>) -> f32 {
    //     let x: f32 = *p.z;
    //     return x;
    // }
    auto* p = Param("p", ty.pointer(ty.vec4<f32>(), ast::StorageClass::kFunction));
    auto* z = Expr(Source{{{3, 3}, {3, 8}}}, "z");
    auto* accessor_expr = MemberAccessor(p, z);
    auto* star_p = Deref(accessor_expr);
    auto* x = Var("x", ty.f32(), star_p);
    Func("func", {p}, ty.f32(), {Decl(x), Return(x)});

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "error: invalid member accessor expression. "
              "Expected vector or struct, got 'ptr<function, vec4<f32>, read_write>'");
}

TEST_F(ResolverValidationTest,
       Stmt_Loop_ContinueInLoopBodyBeforeDeclAndAfterDecl_UsageInContinuing) {
    // loop  {
    //     continue; // Bypasses z decl
    //     var z : i32; // unreachable
    //
    //     continuing {
    //         z = 2;
    //     }
    // }

    auto error_loc = Source{{12, 34}};
    auto* body = Block(Continue(), Decl(error_loc, Var("z", ty.i32(), ast::StorageClass::kNone)));
    auto* continuing = Block(Assign(Expr("z"), 2));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 warning: code is unreachable
error: continue statement bypasses declaration of 'z'
note: identifier 'z' declared here
note: identifier 'z' referenced in continuing block here)");
}

TEST_F(ResolverValidationTest, Stmt_Loop_ContinueInLoopBodyAfterDecl_UsageInContinuing_InBlocks) {
    // loop  {
    //     if (false) { break; }
    //     var z : i32;
    //     {{{continue;}}}
    //     continue; // Ok
    //
    //     continuing {
    //         z = 2;
    //     }
    // }

    auto* body =
        Block(If(false, Block(Break())),  //
              Decl(Var("z", ty.i32(), ast::StorageClass::kNone)), Block(Block(Block(Continue()))));
    auto* continuing = Block(Assign(Expr("z"), 2));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    ASSERT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_Loop_ContinueInLoopBodySubscopeBeforeDecl_UsageInContinuing) {
    // loop  {
    //     if (true) {
    //         continue; // Still bypasses z decl (if we reach here)
    //     }
    //     var z : i32;
    //     continuing {
    //         z = 2;
    //     }
    // }

    auto cont_loc = Source{{12, 34}};
    auto decl_loc = Source{{56, 78}};
    auto ref_loc = Source{{90, 12}};
    auto* body = Block(If(Expr(true), Block(Continue(cont_loc))),
                       Decl(Var(decl_loc, "z", ty.i32(), ast::StorageClass::kNone)));
    auto* continuing = Block(Assign(Expr(ref_loc, "z"), 2));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_FALSE(r()->Resolve()) << r()->error();
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continue statement bypasses declaration of 'z'
56:78 note: identifier 'z' declared here
90:12 note: identifier 'z' referenced in continuing block here)");
}

TEST_F(ResolverValidationTest,
       Stmt_Loop_ContinueInLoopBodySubscopeBeforeDecl_UsageInContinuingSubscope) {
    // loop  {
    //     if (true) {
    //         continue; // Still bypasses z decl (if we reach here)
    //     }
    //     var z : i32;
    //     continuing {
    //         if (true) {
    //             z = 2; // Must fail even if z is in a sub-scope
    //         }
    //     }
    // }

    auto cont_loc = Source{{12, 34}};
    auto decl_loc = Source{{56, 78}};
    auto ref_loc = Source{{90, 12}};
    auto* body = Block(If(Expr(true), Block(Continue(cont_loc))),
                       Decl(Var(decl_loc, "z", ty.i32(), ast::StorageClass::kNone)));

    auto* continuing = Block(If(Expr(true), Block(Assign(Expr(ref_loc, "z"), 2))));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_FALSE(r()->Resolve()) << r()->error();
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continue statement bypasses declaration of 'z'
56:78 note: identifier 'z' declared here
90:12 note: identifier 'z' referenced in continuing block here)");
}

TEST_F(ResolverValidationTest, Stmt_Loop_ContinueInLoopBodySubscopeBeforeDecl_UsageOutsideBlock) {
    // loop  {
    //     if (true) {
    //         continue; // bypasses z decl (if we reach here)
    //     }
    //     var z : i32;
    //     continuing {
    //         // Must fail even if z is used in an expression that isn't
    //         // directly contained inside a block.
    //         if (z < 2) {
    //         }
    //     }
    // }

    auto cont_loc = Source{{12, 34}};
    auto decl_loc = Source{{56, 78}};
    auto ref_loc = Source{{90, 12}};
    auto* body = Block(If(Expr(true), Block(Continue(cont_loc))),
                       Decl(Var(decl_loc, "z", ty.i32(), ast::StorageClass::kNone)));
    auto* compare =
        create<ast::BinaryExpression>(ast::BinaryOp::kLessThan, Expr(ref_loc, "z"), Expr(2));
    auto* continuing = Block(If(compare, Block()));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_FALSE(r()->Resolve()) << r()->error();
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continue statement bypasses declaration of 'z'
56:78 note: identifier 'z' declared here
90:12 note: identifier 'z' referenced in continuing block here)");
}

TEST_F(ResolverValidationTest,
       Stmt_Loop_ContinueInLoopBodySubscopeBeforeDecl_UsageInContinuingLoop) {
    // loop  {
    //     if (true) {
    //         continue; // Still bypasses z decl (if we reach here)
    //     }
    //     var z : i32;
    //     continuing {
    //         loop {
    //             z = 2; // Must fail even if z is in a sub-scope
    //         }
    //     }
    // }

    auto cont_loc = Source{{12, 34}};
    auto decl_loc = Source{{56, 78}};
    auto ref_loc = Source{{90, 12}};
    auto* body = Block(If(Expr(true), Block(Continue(cont_loc))),
                       Decl(Var(decl_loc, "z", ty.i32(), ast::StorageClass::kNone)));

    auto* continuing = Block(Loop(Block(Assign(Expr(ref_loc, "z"), 2))));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_FALSE(r()->Resolve()) << r()->error();
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continue statement bypasses declaration of 'z'
56:78 note: identifier 'z' declared here
90:12 note: identifier 'z' referenced in continuing block here)");
}

TEST_F(ResolverValidationTest, Stmt_Loop_ContinueInNestedLoopBodyBeforeDecl_UsageInContinuing) {
    // loop  {
    //     loop {
    //         if (true) { continue; } // OK: not part of the outer loop
    //         break;
    //     }
    //     var z : i32;
    //     break;
    //     continuing {
    //         z = 2;
    //     }
    // }

    auto* inner_loop = Loop(Block(    //
        If(true, Block(Continue())),  //
        Break()));
    auto* body = Block(inner_loop,                                          //
                       Decl(Var("z", ty.i32(), ast::StorageClass::kNone)),  //
                       Break());
    auto* continuing = Block(Assign("z", 2));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest,
       Stmt_Loop_ContinueInNestedLoopBodyBeforeDecl_UsageInContinuingSubscope) {
    // loop  {
    //     loop {
    //         if (true) { continue; } // OK: not part of the outer loop
    //         break;
    //     }
    //     var z : i32;
    //     break;
    //     continuing {
    //         if (true) {
    //             z = 2;
    //         }
    //     }
    // }

    auto* inner_loop = Loop(Block(If(true, Block(Continue())),  //
                                  Break()));
    auto* body = Block(inner_loop,                                          //
                       Decl(Var("z", ty.i32(), ast::StorageClass::kNone)),  //
                       Break());
    auto* continuing = Block(If(Expr(true), Block(Assign("z", 2))));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_Loop_ContinueInNestedLoopBodyBeforeDecl_UsageInContinuingLoop) {
    // loop  {
    //     loop {
    //         if (true) { continue; } // OK: not part of the outer loop
    //         break;
    //     }
    //     var z : i32;
    //     break;
    //     continuing {
    //         loop {
    //             z = 2;
    //             break;
    //         }
    //     }
    // }

    auto* inner_loop = Loop(Block(If(true, Block(Continue())),  //
                                  Break()));
    auto* body = Block(inner_loop,                                          //
                       Decl(Var("z", ty.i32(), ast::StorageClass::kNone)),  //
                       Break());
    auto* continuing = Block(Loop(Block(Assign("z", 2),  //
                                        Break())));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverTest, Stmt_Loop_ContinueInLoopBodyAfterDecl_UsageInContinuing) {
    // loop  {
    //     var z : i32;
    //     if (true) { continue; }
    //     break;
    //     continuing {
    //         z = 2;
    //     }
    // }

    auto error_loc = Source{{12, 34}};
    auto* body =
        Block(Decl(Var("z", ty.i32(), ast::StorageClass::kNone)), If(true, Block(Continue())),  //
              Break());
    auto* continuing = Block(Assign(Expr(error_loc, "z"), 2));
    auto* loop_stmt = Loop(body, continuing);
    WrapInFunction(loop_stmt);

    EXPECT_TRUE(r()->Resolve());
}

TEST_F(ResolverTest, Stmt_Loop_ReturnInContinuing_Direct) {
    // loop  {
    //   continuing {
    //     return;
    //   }
    // }

    WrapInFunction(Loop(  // loop
        Block(),          //   loop block
        Block(            //   loop continuing block
            Return(Source{{12, 34}}))));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a return statement)");
}

TEST_F(ResolverTest, Stmt_Loop_ReturnInContinuing_Indirect) {
    // loop {
    //   if (false) { break; }
    //   continuing {
    //     loop {
    //       return;
    //     }
    //   }
    // }

    WrapInFunction(Loop(                   // outer loop
        Block(If(false, Block(Break()))),  //   outer loop block
        Block(Source{{56, 78}},            //   outer loop continuing block
              Loop(                        //     inner loop
                  Block(                   //       inner loop block
                      Return(Source{{12, 34}}))))));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a return statement
56:78 note: see continuing block here)");
}

TEST_F(ResolverTest, Stmt_Loop_DiscardInContinuing_Direct) {
    // loop  {
    //   continuing {
    //     discard;
    //   }
    // }

    WrapInFunction(Loop(  // loop
        Block(),          //   loop block
        Block(            //   loop continuing block
            Discard(Source{{12, 34}}))));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a discard statement)");
}

TEST_F(ResolverTest, Stmt_Loop_DiscardInContinuing_Indirect) {
    // loop {
    //   if (false) { break; }
    //   continuing {
    //     loop { discard; }
    //   }
    // }

    WrapInFunction(Loop(                   // outer loop
        Block(If(false, Block(Break()))),  //   outer loop block
        Block(Source{{56, 78}},            //   outer loop continuing block
              Loop(                        //     inner loop
                  Block(                   //       inner loop block
                      Discard(Source{{12, 34}}))))));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a discard statement
56:78 note: see continuing block here)");
}

TEST_F(ResolverTest, Stmt_Loop_DiscardInContinuing_Indirect_ViaCall) {
    // fn MayDiscard() { if (true) { discard; } }
    // fn F() { MayDiscard(); }
    // loop {
    //   continuing {
    //     loop { F(); }
    //   }
    // }

    Func("MayDiscard", {}, ty.void_(), {If(true, Block(Discard()))});
    Func("SomeFunc", {}, ty.void_(), {CallStmt(Call("MayDiscard"))});

    WrapInFunction(Loop(         // outer loop
        Block(),                 //   outer loop block
        Block(Source{{56, 78}},  //   outer loop continuing block
              Loop(              //     inner loop
                  Block(         //       inner loop block
                      CallStmt(Call(Source{{12, 34}}, "SomeFunc")))))));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: cannot call a function that may discard inside a continuing block
56:78 note: see continuing block here)");
}

TEST_F(ResolverTest, Stmt_Loop_ContinueInContinuing_Direct) {
    // loop  {
    //     continuing {
    //         continue;
    //     }
    // }

    WrapInFunction(Loop(         // loop
        Block(),                 //   loop block
        Block(Source{{56, 78}},  //   loop continuing block
              Continue(Source{{12, 34}}))));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: continuing blocks must not contain a continue statement");
}

TEST_F(ResolverTest, Stmt_Loop_ContinueInContinuing_Indirect) {
    // loop {
    //   if (false) { break; }
    //   continuing {
    //     loop {
    //       if (false) { break; }
    //       continue;
    //     }
    //   }
    // }

    WrapInFunction(Loop(                              // outer loop
        Block(                                        //   outer loop block
            If(false, Block(Break()))),               //     if (false) { break; }
        Block(                                        //   outer loop continuing block
            Loop(                                     //     inner loop
                Block(                                //       inner loop block
                    If(false, Block(Break())),        //          if (false) { break; }
                    Continue(Source{{12, 34}}))))));  //    continue

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverTest, Stmt_ForLoop_ReturnInContinuing_Direct) {
    // for(;; return) {
    //   break;
    // }

    WrapInFunction(For(nullptr, nullptr, Return(Source{{12, 34}}),  //
                       Block(Break())));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a return statement)");
}

TEST_F(ResolverTest, Stmt_ForLoop_ReturnInContinuing_Indirect) {
    // for(;; loop { return }) {
    //   break;
    // }

    WrapInFunction(For(nullptr, nullptr,
                       Loop(Source{{56, 78}},                  //
                            Block(Return(Source{{12, 34}}))),  //
                       Block(Break())));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a return statement
56:78 note: see continuing block here)");
}

TEST_F(ResolverTest, Stmt_ForLoop_DiscardInContinuing_Direct) {
    // for(;; discard) {
    //   break;
    // }

    WrapInFunction(For(nullptr, nullptr, Discard(Source{{12, 34}}),  //
                       Block(Break())));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a discard statement)");
}

TEST_F(ResolverTest, Stmt_ForLoop_DiscardInContinuing_Indirect) {
    // for(;; loop { discard }) {
    //   break;
    // }

    WrapInFunction(For(nullptr, nullptr,
                       Loop(Source{{56, 78}},                   //
                            Block(Discard(Source{{12, 34}}))),  //
                       Block(Break())));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: continuing blocks must not contain a discard statement
56:78 note: see continuing block here)");
}

TEST_F(ResolverTest, Stmt_ForLoop_DiscardInContinuing_Indirect_ViaCall) {
    // fn MayDiscard() { if (true) { discard; } }
    // fn F() { MayDiscard(); }
    // for(;; loop { F() }) {
    //   break;
    // }

    Func("MayDiscard", {}, ty.void_(), {If(true, Block(Discard()))});
    Func("F", {}, ty.void_(), {CallStmt(Call("MayDiscard"))});

    WrapInFunction(For(nullptr, nullptr,
                       Loop(Source{{56, 78}},                               //
                            Block(CallStmt(Call(Source{{12, 34}}, "F")))),  //
                       Block(Break())));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              R"(12:34 error: cannot call a function that may discard inside a continuing block
56:78 note: see continuing block here)");
}

TEST_F(ResolverTest, Stmt_ForLoop_ContinueInContinuing_Direct) {
    // for(;; continue) {
    //   break;
    // }

    WrapInFunction(For(nullptr, nullptr, Continue(Source{{12, 34}}),  //
                       Block(Break())));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: continuing blocks must not contain a continue statement");
}

TEST_F(ResolverTest, Stmt_ForLoop_ContinueInContinuing_Indirect) {
    // for(;; loop { if (false) { break; } continue }) {
    //   break;
    // }

    WrapInFunction(For(nullptr, nullptr,
                       Loop(                                    //
                           Block(If(false, Block(Break())),     //
                                 Continue(Source{{12, 34}}))),  //
                       Block(Break())));

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverTest, Stmt_ForLoop_CondIsBoolRef) {
    // var cond : bool = true;
    // for (; cond; ) {
    // }

    auto* cond = Var("cond", ty.bool_(), Expr(true));
    WrapInFunction(Decl(cond), For(nullptr, "cond", nullptr, Block()));
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverTest, Stmt_ForLoop_CondIsNotBool) {
    // for (; 1.0f; ) {
    // }

    WrapInFunction(For(nullptr, Expr(Source{{12, 34}}, 1.0f), nullptr, Block()));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: for-loop condition must be bool, got f32");
}

TEST_F(ResolverValidationTest, Stmt_ContinueInLoop) {
    WrapInFunction(Loop(Block(If(false, Block(Break())),  //
                              Continue(Source{{12, 34}}))));
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_ContinueNotInLoop) {
    WrapInFunction(Continue(Source{{12, 34}}));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: continue statement must be in a loop");
}

TEST_F(ResolverValidationTest, Stmt_BreakInLoop) {
    WrapInFunction(Loop(Block(Break(Source{{12, 34}}))));
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_BreakInSwitch) {
    WrapInFunction(Loop(Block(Switch(Expr(1),               //
                                     Case(Expr(1),          //
                                          Block(Break())),  //
                                     DefaultCase()),        //
                              Break())));                   //
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfTrueInContinuing) {
    auto* cont = Block(                           // continuing {
        If(true, Block(                           //   if(true) {
                     Break(Source{{12, 34}}))));  //     break;
                                                  //   }
                                                  // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfElseInContinuing) {
    auto* cont = Block(                      // continuing {
        If(true, Block(),                    //   if(true) {
           Else(Block(                       //   } else {
               Break(Source{{12, 34}})))));  //     break;
                                             //   }
                                             // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverValidationTest, Stmt_BreakInContinuing) {
    auto* cont = Block(                   // continuing {
        Block(Break(Source{{12, 34}})));  //   break;
                                          // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "12:34 note: break statement is not directly in if statement block");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfInIfInContinuing) {
    auto* cont = Block(                                      // continuing {
        If(true, Block(                                      //   if(true) {
                     If(Source{{56, 78}}, true,              //     if(true) {
                        Block(Break(Source{{12, 34}}))))));  //       break;
                                                             //     }
                                                             //   }
                                                             // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: if statement containing break statement is not directly in "
              "continuing block");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfTrueMultipleStmtsInContinuing) {
    auto* cont = Block(                             // continuing {
        If(true, Block(Source{{56, 78}},            //   if(true) {
                       Assign(Phony(), 1),          //     _ = 1;
                       Break(Source{{12, 34}}))));  //     break;
                                                    //   }
                                                    // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: if statement block contains multiple statements");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfElseMultipleStmtsInContinuing) {
    auto* cont = Block(                             // continuing {
        If(true, Block(),                           //   if(true) {
           Else(Block(Source{{56, 78}},             //   } else {
                      Assign(Phony(), 1),           //     _ = 1;
                      Break(Source{{12, 34}})))));  //     break;
                                                    //   }
                                                    // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: if statement block contains multiple statements");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfElseIfInContinuing) {
    auto* cont = Block(                                 // continuing {
        If(true, Block(),                               //   if(true) {
           Else(If(Source{{56, 78}}, Expr(true),        //   } else if (true) {
                   Block(Break(Source{{12, 34}}))))));  //     break;
                                                        //   }
                                                        // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: else has condition");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfNonEmptyElseInContinuing) {
    auto* cont = Block(                        // continuing {
        If(true,                               //   if(true) {
           Block(Break(Source{{12, 34}})),     //     break;
           Else(Block(Source{{56, 78}},        //   } else {
                      Assign(Phony(), 1)))));  //     _ = 1;
                                               //   }
                                               // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: non-empty false block");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfElseNonEmptyTrueInContinuing) {
    auto* cont = Block(                                  // continuing {
        If(true,                                         //   if(true) {
           Block(Source{{56, 78}}, Assign(Phony(), 1)),  //     _ = 1;
           Else(Block(                                   //   } else {
               Break(Source{{12, 34}})))));              //     break;
                                                         //   }
                                                         // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: non-empty true block");
}

TEST_F(ResolverValidationTest, Stmt_BreakInIfInContinuingNotLast) {
    auto* cont = Block(                      // continuing {
        If(Source{{56, 78}}, true,           //   if(true) {
           Block(Break(Source{{12, 34}}))),  //     break;
                                             //   }
        Assign(Phony(), 1));                 //   _ = 1;
                                             // }
    WrapInFunction(Loop(Block(), cont));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: break statement in a continuing block must be the single "
              "statement of an if statement's true or false block, and that if "
              "statement must be the last statement of the continuing block\n"
              "56:78 note: if statement containing break statement is not the last "
              "statement of the continuing block");
}

TEST_F(ResolverValidationTest, Stmt_BreakNotInLoopOrSwitch) {
    WrapInFunction(Break(Source{{12, 34}}));
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: break statement must be in a loop or switch case");
}

TEST_F(ResolverValidationTest, StructMemberDuplicateName) {
    Structure("S",
              {Member(Source{{12, 34}}, "a", ty.i32()), Member(Source{{56, 78}}, "a", ty.i32())});
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "56:78 error: redefinition of 'a'\n12:34 note: previous definition "
              "is here");
}
TEST_F(ResolverValidationTest, StructMemberDuplicateNameDifferentTypes) {
    Structure("S", {Member(Source{{12, 34}}, "a", ty.bool_()),
                    Member(Source{{12, 34}}, "a", ty.vec3<f32>())});
    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: redefinition of 'a'\n12:34 note: previous definition "
              "is here");
}
TEST_F(ResolverValidationTest, StructMemberDuplicateNamePass) {
    Structure("S", {Member("a", ty.i32()), Member("b", ty.f32())});
    Structure("S1", {Member("a", ty.i32()), Member("b", ty.f32())});
    EXPECT_TRUE(r()->Resolve());
}

TEST_F(ResolverValidationTest, NonPOTStructMemberAlignAttribute) {
    Structure("S", {
                       Member("a", ty.f32(), {MemberAlign(Source{{12, 34}}, 3)}),
                   });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: align value must be a positive, power-of-two integer");
}

TEST_F(ResolverValidationTest, ZeroStructMemberAlignAttribute) {
    Structure("S", {
                       Member("a", ty.f32(), {MemberAlign(Source{{12, 34}}, 0)}),
                   });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: align value must be a positive, power-of-two integer");
}

TEST_F(ResolverValidationTest, ZeroStructMemberSizeAttribute) {
    Structure("S", {
                       Member("a", ty.f32(), {MemberSize(Source{{12, 34}}, 0)}),
                   });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: size must be at least as big as the type's size (4)");
}

TEST_F(ResolverValidationTest, OffsetAndSizeAttribute) {
    Structure("S", {
                       Member(Source{{12, 34}}, "a", ty.f32(), {MemberOffset(0), MemberSize(4)}),
                   });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: offset attributes cannot be used with align or size "
              "attributes");
}

TEST_F(ResolverValidationTest, OffsetAndAlignAttribute) {
    Structure("S", {
                       Member(Source{{12, 34}}, "a", ty.f32(), {MemberOffset(0), MemberAlign(4)}),
                   });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: offset attributes cannot be used with align or size "
              "attributes");
}

TEST_F(ResolverValidationTest, OffsetAndAlignAndSizeAttribute) {
    Structure("S", {
                       Member(Source{{12, 34}}, "a", ty.f32(),
                              {MemberOffset(0), MemberAlign(4), MemberSize(4)}),
                   });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "12:34 error: offset attributes cannot be used with align or size "
              "attributes");
}

TEST_F(ResolverTest, Expr_Constructor_Cast_Pointer) {
    auto* vf = Var("vf", ty.f32());
    auto* c =
        Construct(Source{{12, 34}}, ty.pointer<i32>(ast::StorageClass::kFunction), ExprList(vf));
    auto* ip = Let("ip", ty.pointer<i32>(ast::StorageClass::kFunction), c);
    WrapInFunction(Decl(vf), Decl(ip));

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "12:34 error: type is not constructible");
}

}  // namespace
}  // namespace tint::resolver

TINT_INSTANTIATE_TYPEINFO(tint::resolver::FakeStmt);
TINT_INSTANTIATE_TYPEINFO(tint::resolver::FakeExpr);