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Create a semantic class for block statements 

Semantic information about block statements the resolver would
temporarily create while resolving is now exposed in a
sem::BlockStatement class.

In the process, semantic information about statements in general is
overhauled so that a statement has a reference to its parent
statement, regardless of whether this is a block.

Bug: tint:799
Bug: tint:800
Change-Id: I8771511c5274ea74741b8c86f0f55cbc39810888
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/50904
Commit-Queue: Alastair Donaldson <allydonaldson@googlemail.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
This commit is contained in:
Alastair F. Donaldson 2021-05-15 14:48:46 +00:00 committed by Commit Bot service account
parent 43f50eaf86
commit ac90829e1c
13 changed files with 343 additions and 131 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/BUILD.gn
View File

@ -552,6 +552,7 @@ libtint_source_set("libtint_core_all_src") {
libtint_source_set("libtint_sem_src") {
sources = [
"sem/array.cc",
"sem/block_statement.cc",
"sem/call.cc",
"sem/call_target.cc",
"sem/expression.cc",

2
src/CMakeLists.txt
View File

@ -235,6 +235,8 @@ set(TINT_LIB_SRCS
sem/array.cc
sem/array.h
sem/binding_point.h
sem/block_statement.cc
sem/block_statement.h
sem/call_target.cc
sem/call_target.h
sem/call.cc

176
src/resolver/resolver.cc
View File

@ -145,13 +145,6 @@ Resolver::Resolver(ProgramBuilder* builder)
Resolver::~Resolver() = default;
Resolver::BlockInfo::BlockInfo(const ast::BlockStatement* b,
Resolver::BlockInfo::Type ty,
Resolver::BlockInfo* p)
: block(b), type(ty), parent(p) {}
Resolver::BlockInfo::~BlockInfo() = default;
void Resolver::set_referenced_from_function_if_needed(VariableInfo* var,
bool local) {
if (current_function_ == nullptr) {
@ -1230,7 +1223,18 @@ bool Resolver::Function(ast::Function* func) {
if (func->body()) {
Mark(func->body());
if (!BlockStatement(func->body())) {
if (current_statement_) {
TINT_ICE(diagnostics_)
<< "Resolver::Function() called with a current statement";
return false;
}
sem::BlockStatement* sem_block = builder_->create<sem::BlockStatement>(
func->body(), nullptr, sem::BlockStatement::Type::kGeneric);
builder_->Sem().Add(func->body(), sem_block);
ScopedAssignment<sem::Statement*> sa_function_body(current_statement_,
sem_block);
if (!BlockScope(func->body(),
[&] { return Statements(func->body()->list()); })) {
return false;
}
}
@ -1256,11 +1260,6 @@ bool Resolver::Function(ast::Function* func) {
return true;
}
bool Resolver::BlockStatement(const ast::BlockStatement* stmt) {
return BlockScope(stmt, BlockInfo::Type::kGeneric,
[&] { return Statements(stmt->list()); });
}
bool Resolver::Statements(const ast::StatementList& stmts) {
for (auto* stmt : stmts) {
Mark(stmt);
@ -1272,21 +1271,36 @@ bool Resolver::Statements(const ast::StatementList& stmts) {
}
bool Resolver::Statement(ast::Statement* stmt) {
auto* sem_statement =
builder_->create<sem::Statement>(stmt, current_block_->block);
sem::Statement* sem_statement;
if (stmt->As<ast::BlockStatement>()) {
sem_statement = builder_->create<sem::BlockStatement>(
stmt->As<ast::BlockStatement>(), current_statement_,
sem::BlockStatement::Type::kGeneric);
} else {
sem_statement = builder_->create<sem::Statement>(stmt, current_statement_);
}
builder_->Sem().Add(stmt, sem_statement);
ScopedAssignment<sem::Statement*> sa(current_statement_, sem_statement);
if (stmt->Is<ast::ElseStatement>()) {
TINT_ICE(diagnostics_)
<< "Resolver::Statement() encountered an Else statement. Else "
"statements are embedded in If statements, so should never be "
"encountered as top-level statements";
return false;
}
if (auto* a = stmt->As<ast::AssignmentStatement>()) {
return Assignment(a);
}
if (auto* b = stmt->As<ast::BlockStatement>()) {
return BlockStatement(b);
return BlockScope(b, [&] { return Statements(b->list()); });
}
if (stmt->Is<ast::BreakStatement>()) {
if (!current_block_->FindFirstParent(BlockInfo::Type::kLoop) &&
!current_block_->FindFirstParent(BlockInfo::Type::kSwitchCase)) {
if (!current_block_->FindFirstParent(sem::BlockStatement::Type::kLoop) &&
!current_block_->FindFirstParent(
sem::BlockStatement::Type::kSwitchCase)) {
diagnostics_.add_error("break statement must be in a loop or switch case",
stmt->source());
return false;
@ -1303,9 +1317,10 @@ bool Resolver::Statement(ast::Statement* stmt) {
if (stmt->Is<ast::ContinueStatement>()) {
// Set if we've hit the first continue statement in our parent loop
if (auto* loop_block =
current_block_->FindFirstParent(BlockInfo::Type::kLoop)) {
if (loop_block->first_continue == size_t(~0)) {
loop_block->first_continue = loop_block->decls.size();
current_block_->FindFirstParent(sem::BlockStatement::Type::kLoop)) {
if (loop_block->FirstContinue() == size_t(~0)) {
const_cast<sem::BlockStatement*>(loop_block)
->SetFirstContinue(loop_block->Decls().size());
}
} else {
diagnostics_.add_error("continue statement must be in a loop",
@ -1325,28 +1340,7 @@ bool Resolver::Statement(ast::Statement* stmt) {
return IfStatement(i);
}
if (auto* l = stmt->As<ast::LoopStatement>()) {
// We don't call DetermineBlockStatement on the body and continuing block as
// these would make their BlockInfo siblings as in the AST, but we want the
// body BlockInfo to parent the continuing BlockInfo for semantics and
// validation. Also, we need to set their types differently.
Mark(l->body());
return BlockScope(l->body(), BlockInfo::Type::kLoop, [&] {
if (!Statements(l->body()->list())) {
return false;
}
if (l->continuing()) { // has_continuing() also checks for empty()
Mark(l->continuing());
}
if (l->has_continuing()) {
if (!BlockScope(l->continuing(), BlockInfo::Type::kLoopContinuing,
[&] { return Statements(l->continuing()->list()); })) {
return false;
}
}
return true;
});
return LoopStatement(l);
}
if (auto* r = stmt->As<ast::ReturnStatement>()) {
return Return(r);
@ -1369,7 +1363,11 @@ bool Resolver::CaseStatement(ast::CaseStatement* stmt) {
for (auto* sel : stmt->selectors()) {
Mark(sel);
}
return BlockScope(stmt->body(), BlockInfo::Type::kSwitchCase,
sem::BlockStatement* sem_block = builder_->create<sem::BlockStatement>(
stmt->body(), current_statement_, sem::BlockStatement::Type::kSwitchCase);
builder_->Sem().Add(stmt->body(), sem_block);
ScopedAssignment<sem::Statement*> sa(current_statement_, sem_block);
return BlockScope(stmt->body(),
[&] { return Statements(stmt->body()->list()); });
}
@ -1388,17 +1386,21 @@ bool Resolver::IfStatement(ast::IfStatement* stmt) {
}
Mark(stmt->body());
if (!BlockStatement(stmt->body())) {
{
sem::BlockStatement* sem_block = builder_->create<sem::BlockStatement>(
stmt->body(), current_statement_, sem::BlockStatement::Type::kGeneric);
builder_->Sem().Add(stmt->body(), sem_block);
ScopedAssignment<sem::Statement*> sa(current_statement_, sem_block);
if (!BlockScope(stmt->body(),
[&] { return Statements(stmt->body()->list()); })) {
return false;
}
}
for (auto* else_stmt : stmt->else_statements()) {
Mark(else_stmt);
// Else statements are a bit unusual - they're owned by the if-statement,
// not a BlockStatement.
constexpr ast::BlockStatement* no_block_statement = nullptr;
auto* sem_else_stmt =
builder_->create<sem::Statement>(else_stmt, no_block_statement);
builder_->create<sem::Statement>(else_stmt, current_statement_);
builder_->Sem().Add(else_stmt, sem_else_stmt);
ScopedAssignment<sem::Statement*> sa(current_statement_, sem_else_stmt);
if (auto* cond = else_stmt->condition()) {
@ -1417,11 +1419,54 @@ bool Resolver::IfStatement(ast::IfStatement* stmt) {
}
}
Mark(else_stmt->body());
if (!BlockStatement(else_stmt->body())) {
{
sem::BlockStatement* sem_block = builder_->create<sem::BlockStatement>(
else_stmt->body(), current_statement_,
sem::BlockStatement::Type::kGeneric);
builder_->Sem().Add(else_stmt->body(), sem_block);
ScopedAssignment<sem::Statement*> sa_else_body(current_statement_,
sem_block);
if (!BlockScope(else_stmt->body(),
[&] { return Statements(else_stmt->body()->list()); })) {
return false;
}
}
}
return true;
}
bool Resolver::LoopStatement(ast::LoopStatement* stmt) {
// We don't call DetermineBlockStatement on the body and continuing block as
// these would make their BlockInfo siblings as in the AST, but we want the
// body BlockInfo to parent the continuing BlockInfo for semantics and
// validation. Also, we need to set their types differently.
Mark(stmt->body());
auto* sem_block_body = builder_->create<sem::BlockStatement>(
stmt->body(), current_statement_, sem::BlockStatement::Type::kLoop);
builder_->Sem().Add(stmt->body(), sem_block_body);
ScopedAssignment<sem::Statement*> body_sa(current_statement_, sem_block_body);
return BlockScope(stmt->body(), [&] {
if (!Statements(stmt->body()->list())) {
return false;
}
if (stmt->continuing()) { // has_continuing() also checks for empty()
Mark(stmt->continuing());
}
if (stmt->has_continuing()) {
auto* sem_block_continuing = builder_->create<sem::BlockStatement>(
stmt->continuing(), current_statement_,
sem::BlockStatement::Type::kLoopContinuing);
builder_->Sem().Add(stmt->continuing(), sem_block_continuing);
ScopedAssignment<sem::Statement*> continuing_sa(current_statement_,
sem_block_continuing);
if (!BlockScope(stmt->continuing(),
[&] { return Statements(stmt->continuing()->list()); })) {
return false;
}
}
return true;
});
}
bool Resolver::Expressions(const ast::ExpressionList& list) {
@ -1778,11 +1823,11 @@ bool Resolver::Identifier(ast::IdentifierExpression* expr) {
// refer to a variable that is bypassed by a continue statement in the
// loop's body block.
if (auto* continuing_block = current_block_->FindFirstParent(
BlockInfo::Type::kLoopContinuing)) {
sem::BlockStatement::Type::kLoopContinuing)) {
auto* loop_block =
continuing_block->FindFirstParent(BlockInfo::Type::kLoop);
if (loop_block->first_continue != size_t(~0)) {
auto& decls = loop_block->decls;
continuing_block->FindFirstParent(sem::BlockStatement::Type::kLoop);
if (loop_block->FirstContinue() != size_t(~0)) {
auto& decls = loop_block->Decls();
// If our identifier is in loop_block->decls, make sure its index is
// less than first_continue
auto iter = std::find_if(
@ -1791,7 +1836,7 @@ bool Resolver::Identifier(ast::IdentifierExpression* expr) {
if (iter != decls.end()) {
auto var_decl_index =
static_cast<size_t>(std::distance(decls.begin(), iter));
if (var_decl_index >= loop_block->first_continue) {
if (var_decl_index >= loop_block->FirstContinue()) {
diagnostics_.add_error(
"continue statement bypasses declaration of '" +
builder_->Symbols().NameFor(symbol) +
@ -2227,7 +2272,7 @@ bool Resolver::VariableDeclStatement(const ast::VariableDeclStatement* stmt) {
}
variable_stack_.set(var->symbol(), info);
current_block_->decls.push_back(var);
current_block_->AddDecl(var);
if (!ValidateVariable(info)) {
return false;
@ -2868,6 +2913,11 @@ bool Resolver::Switch(ast::SwitchStatement* s) {
}
for (auto* case_stmt : s->body()) {
Mark(case_stmt);
sem::Statement* sem_statement =
builder_->create<sem::Statement>(case_stmt, current_statement_);
builder_->Sem().Add(case_stmt, sem_statement);
ScopedAssignment<sem::Statement*> sa(current_statement_, sem_statement);
if (!CaseStatement(case_stmt)) {
return false;
}
@ -2992,11 +3042,15 @@ bool Resolver::ApplyStorageClassUsageToType(ast::StorageClass sc,
}
template <typename F>
bool Resolver::BlockScope(const ast::BlockStatement* block,
BlockInfo::Type type,
F&& callback) {
BlockInfo block_info(block, type, current_block_);
ScopedAssignment<BlockInfo*> sa(current_block_, &block_info);
bool Resolver::BlockScope(const ast::BlockStatement* block, F&& callback) {
auto* sem_block = builder_->Sem().Get<sem::BlockStatement>(block);
if (!sem_block) {
TINT_ICE(diagnostics_) << "Resolver::BlockScope() called on a block for "
"which semantic information is not available";
return false;
}
ScopedAssignment<sem::BlockStatement*> sa(
current_block_, const_cast<sem::BlockStatement*>(sem_block));
variable_stack_.push_scope();
bool result = callback();
variable_stack_.pop_scope();

50
src/resolver/resolver.h
View File

@ -25,6 +25,7 @@
#include "src/program_builder.h"
#include "src/scope_stack.h"
#include "src/sem/binding_point.h"
#include "src/sem/block_statement.h"
#include "src/sem/struct.h"
#include "src/utils/unique_vector.h"
@ -40,6 +41,7 @@ class CaseStatement;
class ConstructorExpression;
class Function;
class IdentifierExpression;
class LoopStatement;
class MemberAccessorExpression;
class ReturnStatement;
class SwitchStatement;
@ -137,40 +139,6 @@ class Resolver {
sem::Statement* statement;
};
/// Structure holding semantic information about a block (i.e. scope), such as
/// parent block and variables declared in the block.
/// Used to validate variable scoping rules.
struct BlockInfo {
enum class Type { kGeneric, kLoop, kLoopContinuing, kSwitchCase };
BlockInfo(const ast::BlockStatement* block, Type type, BlockInfo* parent);
~BlockInfo();
template <typename Pred>
BlockInfo* FindFirstParent(Pred&& pred) {
BlockInfo* curr = this;
while (curr && !pred(curr)) {
curr = curr->parent;
}
return curr;
}
BlockInfo* FindFirstParent(BlockInfo::Type ty) {
return FindFirstParent(
[ty](auto* block_info) { return block_info->type == ty; });
}
ast::BlockStatement const* const block;
Type const type;
BlockInfo* const parent;
std::vector<const ast::Variable*> decls;
// first_continue is set to the index of the first variable in decls
// declared after the first continue statement in a loop block, if any.
constexpr static size_t kNoContinue = size_t(~0);
size_t first_continue = kNoContinue;
};
/// Resolves the program, without creating final the semantic nodes.
/// @returns true on success, false on error
bool ResolveInternal();
@ -200,7 +168,6 @@ class Resolver {
bool Assignment(ast::AssignmentStatement* a);
bool Binary(ast::BinaryExpression*);
bool Bitcast(ast::BitcastExpression*);
bool BlockStatement(const ast::BlockStatement*);
bool Call(ast::CallExpression*);
bool CaseStatement(ast::CaseStatement*);
bool Constructor(ast::ConstructorExpression*);
@ -211,6 +178,7 @@ class Resolver {
bool Identifier(ast::IdentifierExpression*);
bool IfStatement(ast::IfStatement*);
bool IntrinsicCall(ast::CallExpression*, sem::IntrinsicType);
bool LoopStatement(ast::LoopStatement*);
bool MemberAccessor(ast::MemberAccessorExpression*);
bool Parameter(ast::Variable* param);
bool Return(ast::ReturnStatement* ret);
@ -317,13 +285,11 @@ class Resolver {
typ::Type type,
const std::string& type_name);
/// Constructs a new BlockInfo with the given type and with #current_block_ as
/// its parent, assigns this to #current_block_, and then calls `callback`.
/// The original #current_block_ is restored on exit.
/// Constructs a new semantic BlockStatement with the given type and with
/// #current_block_ as its parent, assigns this to #current_block_, and then
/// calls `callback`. The original #current_block_ is restored on exit.
template <typename F>
bool BlockScope(const ast::BlockStatement* block,
BlockInfo::Type type,
F&& callback);
bool BlockScope(const ast::BlockStatement* block, F&& callback);
/// Returns a human-readable string representation of the vector type name
/// with the given parameters.
@ -340,7 +306,7 @@ class Resolver {
ProgramBuilder* const builder_;
diag::List& diagnostics_;
std::unique_ptr<IntrinsicTable> const intrinsic_table_;
BlockInfo* current_block_ = nullptr;
sem::BlockStatement* current_block_ = nullptr;
ScopeStack<VariableInfo*> variable_stack_;
std::unordered_map<Symbol, FunctionInfo*> symbol_to_function_;
std::unordered_map<const ast::Function*, FunctionInfo*> function_to_info_;

4
src/resolver/resolver_test_helper.h
View File

@ -56,7 +56,7 @@ class TestHelper : public ProgramBuilder {
/// if the statement is not owned by a BlockStatement.
const ast::BlockStatement* BlockOf(ast::Statement* stmt) {
auto* sem_stmt = Sem().Get(stmt);
return sem_stmt ? sem_stmt->Block() : nullptr;
return sem_stmt ? sem_stmt->Block()->Declaration() : nullptr;
}
/// Returns the BlockStatement that holds the given expression.
@ -65,7 +65,7 @@ class TestHelper : public ProgramBuilder {
/// expression is not indirectly owned by a BlockStatement.
const ast::BlockStatement* BlockOf(ast::Expression* expr) {
auto* sem_stmt = Sem().Get(expr)->Stmt();
return sem_stmt ? sem_stmt->Block() : nullptr;
return sem_stmt ? sem_stmt->Block()->Declaration() : nullptr;
}
/// Returns the semantic variable for the given identifier expression.

51
src/sem/block_statement.cc Normal file
View File

@ -0,0 +1,51 @@
// 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/sem/block_statement.h"
#include "src/ast/block_statement.h"
TINT_INSTANTIATE_TYPEINFO(tint::sem::BlockStatement);
namespace tint {
namespace sem {
BlockStatement::BlockStatement(const ast::BlockStatement* declaration,
const Statement* parent,
Type type)
: Base(declaration, parent), type_(type) {}
BlockStatement::~BlockStatement() = default;
const BlockStatement* BlockStatement::FindFirstParent(
BlockStatement::Type ty) const {
return FindFirstParent(
[ty](auto* block_info) { return block_info->type_ == ty; });
}
const ast::BlockStatement* BlockStatement::Declaration() const {
return Base::Declaration()->As<ast::BlockStatement>();
}
void BlockStatement::SetFirstContinue(size_t first_continue) {
TINT_ASSERT(type_ == Type::kLoop);
first_continue_ = first_continue;
}
void BlockStatement::AddDecl(ast::Variable* var) {
decls_.push_back(var);
}
} // namespace sem
} // namespace tint

105
src/sem/block_statement.h Normal file
View File

@ -0,0 +1,105 @@
// 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.
#ifndef SRC_SEM_BLOCK_STATEMENT_H_
#define SRC_SEM_BLOCK_STATEMENT_H_
#include <vector>
#include "src/debug.h"
#include "src/sem/statement.h"
namespace tint {
// Forward declarations
namespace ast {
class BlockStatement;
class Variable;
} // namespace ast
namespace sem {
/// Holds semantic information about a block, such as parent block and variables
/// declared in the block.
class BlockStatement : public Castable<BlockStatement, Statement> {
public:
enum class Type { kGeneric, kLoop, kLoopContinuing, kSwitchCase };
/// Constructor
/// @param declaration the AST node for this block statement
/// @param parent the owning statement
/// @param type the type of block this is
BlockStatement(const ast::BlockStatement* declaration,
const Statement* parent,
Type type);
/// Destructor
~BlockStatement() override;
/// @returns the AST block statement associated with this semantic block
/// statement
const ast::BlockStatement* Declaration() const;
/// @returns the closest enclosing block that satisfies the given predicate,
/// which may be the block itself, or nullptr if no match is found
/// @param pred a predicate that the resulting block must satisfy
template <typename Pred>
const BlockStatement* FindFirstParent(Pred&& pred) const {
const BlockStatement* curr = this;
while (curr && !pred(curr)) {
curr = curr->Block();
}
return curr;
}
/// @returns the closest enclosing block that matches the given type, which
/// may be the block itself, or nullptr if no match is found
/// @param ty the type of block to be searched for
const BlockStatement* FindFirstParent(BlockStatement::Type ty) const;
/// @returns the declarations associated with this block
const std::vector<const ast::Variable*>& Decls() const { return decls_; }
/// Requires that this is a loop block.
/// @returns the index of the first variable declared after the first continue
/// statement
size_t FirstContinue() const {
TINT_ASSERT(type_ == Type::kLoop);
return first_continue_;
}
/// Requires that this is a loop block.
/// Allows the resolver to set the index of the first variable declared after
/// the first continue statement.
/// @param first_continue index of the relevant variable
void SetFirstContinue(size_t first_continue);
/// Allows the resolver to associate a declaration with this block.
/// @param var a variable declaration to be added to the block
void AddDecl(ast::Variable* var);
private:
Type const type_;
std::vector<const ast::Variable*> decls_;
// first_continue is set to the index of the first variable in decls
// declared after the first continue statement in a loop block, if any.
constexpr static size_t kNoContinue = size_t(~0);
size_t first_continue_ = kNoContinue;
};
} // namespace sem
} // namespace tint
#endif // SRC_SEM_BLOCK_STATEMENT_H_

44
src/sem/statement.cc
View File

@ -15,7 +15,10 @@
#include <algorithm>
#include "src/ast/block_statement.h"
#include "src/ast/loop_statement.h"
#include "src/ast/statement.h"
#include "src/debug.h"
#include "src/sem/block_statement.h"
#include "src/sem/statement.h"
TINT_INSTANTIATE_TYPEINFO(tint::sem::Statement);
@ -23,17 +26,44 @@ TINT_INSTANTIATE_TYPEINFO(tint::sem::Statement);
namespace tint {
namespace sem {
Statement::Statement(const ast::Statement* declaration,
const ast::BlockStatement* block)
: declaration_(declaration), block_(block) {
Statement::Statement(const ast::Statement* declaration, const Statement* parent)
: declaration_(declaration), parent_(parent) {
#ifndef NDEBUG
if (block) {
auto& stmts = block->statements();
TINT_ASSERT(std::find(stmts.begin(), stmts.end(), declaration) !=
stmts.end());
if (parent_) {
auto* block = Block();
if (parent_ == block) {
// The parent of this statement is a block. We thus expect the statement
// to be an element of the block. There is one exception: a loop's
// continuing block has the loop's body as its parent, but the continuing
// block is not a statement in the body, so we rule out that case.
auto& stmts = block->Declaration()->statements();
if (std::find(stmts.begin(), stmts.end(), declaration) == stmts.end()) {
bool statement_is_continuing_for_loop = false;
if (parent_->parent_ != nullptr) {
if (auto* loop =
parent_->parent_->Declaration()->As<ast::LoopStatement>()) {
if (loop->has_continuing() && Declaration() == loop->continuing()) {
statement_is_continuing_for_loop = true;
}
}
}
TINT_ASSERT(statement_is_continuing_for_loop);
}
}
}
#endif // NDEBUG
}
const BlockStatement* Statement::Block() const {
auto* stmt = parent_;
while (stmt != nullptr) {
if (auto* block_stmt = stmt->As<BlockStatement>()) {
return block_stmt;
}
stmt = stmt->parent_;
}
return nullptr;
}
} // namespace sem
} // namespace tint

17
src/sem/statement.h
View File

@ -21,30 +21,33 @@ namespace tint {
// Forward declarations
namespace ast {
class BlockStatement;
class Statement;
} // namespace ast
namespace sem {
class BlockStatement;
/// Statement holds the semantic information for a statement.
class Statement : public Castable<Statement, Node> {
public:
/// Constructor
/// @param declaration the AST node for this statement
/// @param block the owning AST block statement
Statement(const ast::Statement* declaration,
const ast::BlockStatement* block);
/// @param parent the owning statement
Statement(const ast::Statement* declaration, const Statement* parent);
/// @return the AST node for this statement
const ast::Statement* Declaration() const { return declaration_; }
/// @return the owning AST block statement for this statement
const ast::BlockStatement* Block() const { return block_; }
/// @return the statement that encloses this statement
const Statement* Parent() const { return parent_; }
/// @return the closest enclosing block for this statement
const BlockStatement* Block() const;
private:
ast::Statement const* const declaration_;
ast::BlockStatement const* const block_;
Statement const* const parent_;
};
} // namespace sem

8
src/transform/calculate_array_length.cc
View File

@ -19,6 +19,7 @@
#include "src/ast/call_statement.h"
#include "src/program_builder.h"
#include "src/sem/block_statement.h"
#include "src/sem/call.h"
#include "src/sem/statement.h"
#include "src/sem/struct.h"
@ -155,12 +156,7 @@ Output CalculateArrayLength::Run(const Program* in, const DataMap&) {
}
// Find the current statement block
auto* block = call->Stmt()->Block();
if (!block) {
TINT_ICE(ctx.dst->Diagnostics())
<< "arrayLength() statement is outside a BlockStatement";
break;
}
auto* block = call->Stmt()->Block()->Declaration();
// If the storage_buffer_expr is resolves to a variable (typically
// true) then key the array_length from the variable. If not, key off

4
src/transform/canonicalize_entry_point_io.cc
View File

@ -19,6 +19,7 @@
#include <vector>
#include "src/program_builder.h"
#include "src/sem/block_statement.h"
#include "src/sem/function.h"
#include "src/sem/statement.h"
#include "src/sem/struct.h"
@ -257,7 +258,8 @@ Output CanonicalizeEntryPointIO::Run(const Program* in, const DataMap&) {
auto* ty = CreateASTTypeFor(&ctx, ret_type);
auto* temp_var =
ctx.dst->Decl(ctx.dst->Const(temp, ty, new_ret_value()));
ctx.InsertBefore(ret_sem->Block()->statements(), ret, temp_var);
ctx.InsertBefore(ret_sem->Block()->Declaration()->statements(), ret,
temp_var);
new_ret_value = [&ctx, temp] { return ctx.dst->Expr(temp); };
}

5
src/transform/hlsl.cc
View File

@ -19,6 +19,7 @@
#include "src/ast/stage_decoration.h"
#include "src/ast/variable_decl_statement.h"
#include "src/program_builder.h"
#include "src/sem/block_statement.h"
#include "src/sem/expression.h"
#include "src/sem/statement.h"
#include "src/sem/variable.h"
@ -113,8 +114,8 @@ void Hlsl::PromoteInitializersToConstVar(CloneContext& ctx) const {
auto* dst_ident = ctx.dst->Expr(dst_symbol);
// Insert the constant before the usage
ctx.InsertBefore(src_sem_stmt->Block()->statements(), src_stmt,
dst_var_decl);
ctx.InsertBefore(src_sem_stmt->Block()->Declaration()->statements(),
src_stmt, dst_var_decl);
// Replace the inlined initializer with a reference to the constant
ctx.Replace(src_init, dst_ident);
}

3
src/transform/spirv.cc
View File

@ -21,6 +21,7 @@
#include "src/ast/return_statement.h"
#include "src/ast/stage_decoration.h"
#include "src/program_builder.h"
#include "src/sem/block_statement.h"
#include "src/sem/function.h"
#include "src/sem/statement.h"
#include "src/sem/struct.h"
@ -188,7 +189,7 @@ void Spirv::HandleEntryPointIOTypes(CloneContext& ctx) const {
for (auto* ret : func->ReturnStatements()) {
auto* ret_sem = ctx.src->Sem().Get(ret);
auto* call = ctx.dst->Call(return_func_symbol, ctx.Clone(ret->value()));
ctx.InsertBefore(ret_sem->Block()->statements(), ret,
ctx.InsertBefore(ret_sem->Block()->Declaration()->statements(), ret,
ctx.dst->create<ast::CallStatement>(call));
ctx.Replace(ret, ctx.dst->Return());
}