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dawn-cmake/src/writer/msl/generator_impl.cc
James Price 2b5acacbd4 [msl-writer] Add support for sample_mask builtins 
Bug: tint:372
Change-Id: Ib1d9dc525fbc180b603241c4746cbbd54077a489
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/40640
Commit-Queue: Ben Clayton <bclayton@google.com>
Auto-Submit: James Price <jrprice@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
2021-02-09 19:13:25 +00:00

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// Copyright 2020 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/writer/msl/generator_impl.h"
#include <algorithm>
#include <limits>
#include <utility>
#include <vector>
#include "src/ast/array_accessor_expression.h"
#include "src/ast/assignment_statement.h"
#include "src/ast/binary_expression.h"
#include "src/ast/bitcast_expression.h"
#include "src/ast/block_statement.h"
#include "src/ast/bool_literal.h"
#include "src/ast/break_statement.h"
#include "src/ast/call_expression.h"
#include "src/ast/call_statement.h"
#include "src/ast/case_statement.h"
#include "src/ast/constant_id_decoration.h"
#include "src/ast/continue_statement.h"
#include "src/ast/else_statement.h"
#include "src/ast/fallthrough_statement.h"
#include "src/ast/float_literal.h"
#include "src/ast/function.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/if_statement.h"
#include "src/ast/location_decoration.h"
#include "src/ast/loop_statement.h"
#include "src/ast/member_accessor_expression.h"
#include "src/ast/module.h"
#include "src/ast/return_statement.h"
#include "src/ast/sint_literal.h"
#include "src/ast/struct_member_offset_decoration.h"
#include "src/ast/switch_statement.h"
#include "src/ast/uint_literal.h"
#include "src/ast/unary_op_expression.h"
#include "src/ast/variable.h"
#include "src/ast/variable_decl_statement.h"
#include "src/program.h"
#include "src/semantic/call.h"
#include "src/semantic/expression.h"
#include "src/semantic/function.h"
#include "src/semantic/member_accessor_expression.h"
#include "src/semantic/variable.h"
#include "src/type/access_control_type.h"
#include "src/type/alias_type.h"
#include "src/type/array_type.h"
#include "src/type/bool_type.h"
#include "src/type/depth_texture_type.h"
#include "src/type/f32_type.h"
#include "src/type/i32_type.h"
#include "src/type/matrix_type.h"
#include "src/type/multisampled_texture_type.h"
#include "src/type/pointer_type.h"
#include "src/type/sampled_texture_type.h"
#include "src/type/sampler_type.h"
#include "src/type/storage_texture_type.h"
#include "src/type/struct_type.h"
#include "src/type/u32_type.h"
#include "src/type/vector_type.h"
#include "src/type/void_type.h"
#include "src/writer/float_to_string.h"
namespace tint {
namespace writer {
namespace msl {
namespace {
const char kInStructNameSuffix[] = "in";
const char kOutStructNameSuffix[] = "out";
const char kTintStructInVarPrefix[] = "tint_in";
const char kTintStructOutVarPrefix[] = "tint_out";
bool last_is_break_or_fallthrough(const ast::BlockStatement* stmts) {
if (stmts->empty()) {
return false;
}
return stmts->last()->Is<ast::BreakStatement>() ||
stmts->last()->Is<ast::FallthroughStatement>();
}
uint32_t adjust_for_alignment(uint32_t count, uint32_t alignment) {
const auto spill = count % alignment;
if (spill == 0) {
return count;
}
return count + alignment - spill;
}
} // namespace
GeneratorImpl::GeneratorImpl(const Program* program)
: TextGenerator(), program_(program) {}
GeneratorImpl::~GeneratorImpl() = default;
std::string GeneratorImpl::generate_name(const std::string& prefix) {
std::string name = prefix;
uint32_t i = 0;
while (namer_.IsMapped(name)) {
name = prefix + "_" + std::to_string(i);
++i;
}
namer_.RegisterRemappedName(name);
return name;
}
bool GeneratorImpl::Generate() {
out_ << "#include <metal_stdlib>" << std::endl << std::endl;
for (auto* global : program_->AST().GlobalVariables()) {
auto* sem = program_->Sem().Get(global);
global_variables_.set(global->symbol(), sem);
}
for (auto* const ty : program_->AST().ConstructedTypes()) {
if (!EmitConstructedType(ty)) {
return false;
}
}
if (!program_->AST().ConstructedTypes().empty()) {
out_ << std::endl;
}
for (auto* var : program_->AST().GlobalVariables()) {
if (!var->is_const()) {
continue;
}
if (!EmitProgramConstVariable(var)) {
return false;
}
}
// Make sure all entry point data is emitted before the entry point functions
for (auto* func : program_->AST().Functions()) {
if (!func->IsEntryPoint()) {
continue;
}
if (!EmitEntryPointData(func)) {
return false;
}
}
for (auto* func : program_->AST().Functions()) {
if (!EmitFunction(func)) {
return false;
}
}
for (auto* func : program_->AST().Functions()) {
if (!func->IsEntryPoint()) {
continue;
}
if (!EmitEntryPointFunction(func)) {
return false;
}
out_ << std::endl;
}
return true;
}
uint32_t GeneratorImpl::calculate_largest_alignment(type::Struct* type) {
auto* stct = type->As<type::Struct>()->impl();
uint32_t largest_alignment = 0;
for (auto* mem : stct->members()) {
auto align = calculate_alignment_size(mem->type());
if (align == 0) {
return 0;
}
if (!mem->type()->Is<type::Struct>()) {
largest_alignment = std::max(largest_alignment, align);
} else {
largest_alignment = std::max(
largest_alignment,
calculate_largest_alignment(mem->type()->As<type::Struct>()));
}
}
return largest_alignment;
}
uint32_t GeneratorImpl::calculate_alignment_size(type::Type* type) {
if (auto* alias = type->As<type::Alias>()) {
return calculate_alignment_size(alias->type());
}
if (auto* ary = type->As<type::Array>()) {
// TODO(dsinclair): Handle array stride and adjust for alignment.
uint32_t type_size = calculate_alignment_size(ary->type());
return ary->size() * type_size;
}
if (type->Is<type::Bool>()) {
return 1;
}
if (type->Is<type::Pointer>()) {
return 0;
}
if (type->Is<type::F32>() || type->Is<type::I32>() || type->Is<type::U32>()) {
return 4;
}
if (auto* mat = type->As<type::Matrix>()) {
// TODO(dsinclair): Handle MatrixStride
// https://github.com/gpuweb/gpuweb/issues/773
uint32_t type_size = calculate_alignment_size(mat->type());
return mat->rows() * mat->columns() * type_size;
}
if (auto* stct_ty = type->As<type::Struct>()) {
auto* stct = stct_ty->impl();
uint32_t count = 0;
uint32_t largest_alignment = 0;
// Offset decorations in WGSL must be in increasing order.
for (auto* mem : stct->members()) {
for (auto* deco : mem->decorations()) {
if (auto* offset = deco->As<ast::StructMemberOffsetDecoration>()) {
count = offset->offset();
}
}
auto align = calculate_alignment_size(mem->type());
if (align == 0) {
return 0;
}
if (auto* str = mem->type()->As<type::Struct>()) {
largest_alignment =
std::max(largest_alignment, calculate_largest_alignment(str));
} else {
largest_alignment = std::max(largest_alignment, align);
}
// Round up to the alignment size
count = adjust_for_alignment(count, align);
count += align;
}
// Round struct up to largest align size
count = adjust_for_alignment(count, largest_alignment);
return count;
}
if (auto* vec = type->As<type::Vector>()) {
uint32_t type_size = calculate_alignment_size(vec->type());
if (vec->size() == 2) {
return 2 * type_size;
}
return 4 * type_size;
}
return 0;
}
bool GeneratorImpl::EmitConstructedType(const type::Type* ty) {
make_indent();
if (auto* alias = ty->As<type::Alias>()) {
out_ << "typedef ";
if (!EmitType(alias->type(), "")) {
return false;
}
out_ << " " << namer_.NameFor(program_->Symbols().NameFor(alias->symbol()))
<< ";" << std::endl;
} else if (auto* str = ty->As<type::Struct>()) {
if (!EmitStructType(str)) {
return false;
}
} else {
error_ = "unknown alias type: " + ty->type_name();
return false;
}
return true;
}
bool GeneratorImpl::EmitArrayAccessor(ast::ArrayAccessorExpression* expr) {
if (!EmitExpression(expr->array())) {
return false;
}
out_ << "[";
if (!EmitExpression(expr->idx_expr())) {
return false;
}
out_ << "]";
return true;
}
bool GeneratorImpl::EmitBitcast(ast::BitcastExpression* expr) {
out_ << "as_type<";
if (!EmitType(expr->type(), "")) {
return false;
}
out_ << ">(";
if (!EmitExpression(expr->expr())) {
return false;
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitAssign(ast::AssignmentStatement* stmt) {
make_indent();
if (!EmitExpression(stmt->lhs())) {
return false;
}
out_ << " = ";
if (!EmitExpression(stmt->rhs())) {
return false;
}
out_ << ";" << std::endl;
return true;
}
bool GeneratorImpl::EmitBinary(ast::BinaryExpression* expr) {
out_ << "(";
if (!EmitExpression(expr->lhs())) {
return false;
}
out_ << " ";
switch (expr->op()) {
case ast::BinaryOp::kAnd:
out_ << "&";
break;
case ast::BinaryOp::kOr:
out_ << "|";
break;
case ast::BinaryOp::kXor:
out_ << "^";
break;
case ast::BinaryOp::kLogicalAnd:
out_ << "&&";
break;
case ast::BinaryOp::kLogicalOr:
out_ << "||";
break;
case ast::BinaryOp::kEqual:
out_ << "==";
break;
case ast::BinaryOp::kNotEqual:
out_ << "!=";
break;
case ast::BinaryOp::kLessThan:
out_ << "<";
break;
case ast::BinaryOp::kGreaterThan:
out_ << ">";
break;
case ast::BinaryOp::kLessThanEqual:
out_ << "<=";
break;
case ast::BinaryOp::kGreaterThanEqual:
out_ << ">=";
break;
case ast::BinaryOp::kShiftLeft:
out_ << "<<";
break;
case ast::BinaryOp::kShiftRight:
// TODO(dsinclair): MSL is based on C++14, and >> in C++14 has
// implementation-defined behaviour for negative LHS. We may have to
// generate extra code to implement WGSL-specified behaviour for negative
// LHS.
out_ << R"(>>)";
break;
case ast::BinaryOp::kAdd:
out_ << "+";
break;
case ast::BinaryOp::kSubtract:
out_ << "-";
break;
case ast::BinaryOp::kMultiply:
out_ << "*";
break;
case ast::BinaryOp::kDivide:
out_ << "/";
break;
case ast::BinaryOp::kModulo:
out_ << "%";
break;
case ast::BinaryOp::kNone:
error_ = "missing binary operation type";
return false;
}
out_ << " ";
if (!EmitExpression(expr->rhs())) {
return false;
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitBreak(ast::BreakStatement*) {
make_indent();
out_ << "break;" << std::endl;
return true;
}
std::string GeneratorImpl::current_ep_var_name(VarType type) {
std::string name = "";
switch (type) {
case VarType::kIn: {
auto in_it = ep_sym_to_in_data_.find(current_ep_sym_);
if (in_it != ep_sym_to_in_data_.end()) {
name = in_it->second.var_name;
}
break;
}
case VarType::kOut: {
auto out_it = ep_sym_to_out_data_.find(current_ep_sym_);
if (out_it != ep_sym_to_out_data_.end()) {
name = out_it->second.var_name;
}
break;
}
}
return name;
}
bool GeneratorImpl::EmitCall(ast::CallExpression* expr) {
auto* ident = expr->func()->As<ast::IdentifierExpression>();
if (ident == nullptr) {
error_ = "invalid function name";
return 0;
}
auto* call = program_->Sem().Get(expr);
if (auto* intrinsic = call->Target()->As<semantic::Intrinsic>()) {
if (intrinsic->IsTexture()) {
return EmitTextureCall(expr, intrinsic);
}
if (intrinsic->Type() == semantic::IntrinsicType::kPack2x16Float) {
make_indent();
out_ << "as_type<uint>(half2(";
if (!EmitExpression(expr->params()[0])) {
return false;
}
out_ << "))";
return true;
}
auto name = generate_builtin_name(intrinsic);
if (name.empty()) {
return false;
}
make_indent();
out_ << name << "(";
bool first = true;
const auto& params = expr->params();
for (auto* param : params) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitExpression(param)) {
return false;
}
}
out_ << ")";
return true;
}
auto name = program_->Symbols().NameFor(ident->symbol());
auto caller_sym = ident->symbol();
auto it = ep_func_name_remapped_.find(current_ep_sym_.to_str() + "_" +
caller_sym.to_str());
if (it != ep_func_name_remapped_.end()) {
name = it->second;
}
auto* func = program_->AST().Functions().Find(ident->symbol());
if (func == nullptr) {
error_ = "Unable to find function: " +
program_->Symbols().NameFor(ident->symbol());
return false;
}
out_ << name << "(";
bool first = true;
if (has_referenced_in_var_needing_struct(func)) {
auto var_name = current_ep_var_name(VarType::kIn);
if (!var_name.empty()) {
out_ << var_name;
first = false;
}
}
if (has_referenced_out_var_needing_struct(func)) {
auto var_name = current_ep_var_name(VarType::kOut);
if (!var_name.empty()) {
if (!first) {
out_ << ", ";
}
first = false;
out_ << var_name;
}
}
auto* func_sem = program_->Sem().Get(func);
for (const auto& data : func_sem->ReferencedBuiltinVariables()) {
auto* var = data.first;
if (var->StorageClass() != ast::StorageClass::kInput) {
continue;
}
if (!first) {
out_ << ", ";
}
first = false;
out_ << program_->Symbols().NameFor(var->Declaration()->symbol());
}
for (const auto& data : func_sem->ReferencedUniformVariables()) {
auto* var = data.first;
if (!first) {
out_ << ", ";
}
first = false;
out_ << program_->Symbols().NameFor(var->Declaration()->symbol());
}
for (const auto& data : func_sem->ReferencedStoragebufferVariables()) {
auto* var = data.first;
if (!first) {
out_ << ", ";
}
first = false;
out_ << program_->Symbols().NameFor(var->Declaration()->symbol());
}
const auto& params = expr->params();
for (auto* param : params) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitExpression(param)) {
return false;
}
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitTextureCall(ast::CallExpression* expr,
const semantic::Intrinsic* intrinsic) {
using Usage = semantic::Parameter::Usage;
auto parameters = intrinsic->Parameters();
auto arguments = expr->params();
// Returns the argument with the given usage
auto arg = [&](Usage usage) {
int idx = semantic::IndexOf(parameters, usage);
return (idx >= 0) ? arguments[idx] : nullptr;
};
auto* texture = arg(Usage::kTexture);
assert(texture);
auto* texture_type = TypeOf(texture)->UnwrapAll()->As<type::Texture>();
switch (intrinsic->Type()) {
case semantic::IntrinsicType::kTextureDimensions: {
std::vector<const char*> dims;
switch (texture_type->dim()) {
case type::TextureDimension::kNone:
error_ = "texture dimension is kNone";
return false;
case type::TextureDimension::k1d:
case type::TextureDimension::k1dArray:
dims = {"width"};
break;
case type::TextureDimension::k2d:
case type::TextureDimension::k2dArray:
dims = {"width", "height"};
break;
case type::TextureDimension::k3d:
dims = {"width", "height", "depth"};
break;
case type::TextureDimension::kCube:
case type::TextureDimension::kCubeArray:
// width == height == depth for cubes
// See https://github.com/gpuweb/gpuweb/issues/1345
dims = {"width", "height", "height"};
break;
}
auto get_dim = [&](const char* name) {
if (!EmitExpression(texture)) {
return false;
}
out_ << ".get_" << name << "(";
if (auto* level = arg(Usage::kLevel)) {
if (!EmitExpression(level)) {
return false;
}
}
out_ << ")";
return true;
};
if (dims.size() == 1) {
out_ << "int(";
get_dim(dims[0]);
out_ << ")";
} else {
EmitType(TypeOf(expr), "");
out_ << "(";
for (size_t i = 0; i < dims.size(); i++) {
if (i > 0) {
out_ << ", ";
}
get_dim(dims[i]);
}
out_ << ")";
}
return true;
}
case semantic::IntrinsicType::kTextureNumLayers: {
out_ << "int(";
if (!EmitExpression(texture)) {
return false;
}
out_ << ".get_array_size())";
return true;
}
case semantic::IntrinsicType::kTextureNumLevels: {
out_ << "int(";
if (!EmitExpression(texture)) {
return false;
}
out_ << ".get_num_mip_levels())";
return true;
}
case semantic::IntrinsicType::kTextureNumSamples: {
out_ << "int(";
if (!EmitExpression(texture)) {
return false;
}
out_ << ".get_num_samples())";
return true;
}
default:
break;
}
if (!EmitExpression(texture))
return false;
bool lod_param_is_named = true;
switch (intrinsic->Type()) {
case semantic::IntrinsicType::kTextureSample:
case semantic::IntrinsicType::kTextureSampleBias:
case semantic::IntrinsicType::kTextureSampleLevel:
case semantic::IntrinsicType::kTextureSampleGrad:
out_ << ".sample(";
break;
case semantic::IntrinsicType::kTextureSampleCompare:
out_ << ".sample_compare(";
break;
case semantic::IntrinsicType::kTextureLoad:
out_ << ".read(";
lod_param_is_named = false;
break;
case semantic::IntrinsicType::kTextureStore:
out_ << ".write(";
break;
default:
error_ = "Internal compiler error: Unhandled texture intrinsic '" +
std::string(intrinsic->str()) + "'";
return false;
}
bool first_arg = true;
auto maybe_write_comma = [&] {
if (!first_arg) {
out_ << ", ";
}
first_arg = false;
};
for (auto usage :
{Usage::kValue, Usage::kSampler, Usage::kCoords, Usage::kArrayIndex,
Usage::kDepthRef, Usage::kSampleIndex}) {
if (auto* e = arg(usage)) {
maybe_write_comma();
if (!EmitExpression(e))
return false;
}
}
if (auto* bias = arg(Usage::kBias)) {
maybe_write_comma();
out_ << "bias(";
if (!EmitExpression(bias)) {
return false;
}
out_ << ")";
}
if (auto* level = arg(Usage::kLevel)) {
maybe_write_comma();
if (lod_param_is_named) {
out_ << "level(";
}
if (!EmitExpression(level)) {
return false;
}
if (lod_param_is_named) {
out_ << ")";
}
}
if (auto* ddx = arg(Usage::kDdx)) {
auto dim = texture_type->dim();
switch (dim) {
case type::TextureDimension::k2d:
case type::TextureDimension::k2dArray:
maybe_write_comma();
out_ << "gradient2d(";
break;
case type::TextureDimension::k3d:
maybe_write_comma();
out_ << "gradient3d(";
break;
case type::TextureDimension::kCube:
case type::TextureDimension::kCubeArray:
maybe_write_comma();
out_ << "gradientcube(";
break;
default: {
std::stringstream err;
err << "MSL does not support gradients for " << dim << " textures";
error_ = err.str();
return false;
}
}
if (!EmitExpression(ddx)) {
return false;
}
out_ << ", ";
if (!EmitExpression(arg(Usage::kDdy))) {
return false;
}
out_ << ")";
}
if (auto* offset = arg(Usage::kOffset)) {
maybe_write_comma();
if (!EmitExpression(offset)) {
return false;
}
}
out_ << ")";
return true;
}
std::string GeneratorImpl::generate_builtin_name(
const semantic::Intrinsic* intrinsic) {
std::string out = "metal::";
switch (intrinsic->Type()) {
case semantic::IntrinsicType::kAcos:
case semantic::IntrinsicType::kAll:
case semantic::IntrinsicType::kAny:
case semantic::IntrinsicType::kAsin:
case semantic::IntrinsicType::kAtan:
case semantic::IntrinsicType::kAtan2:
case semantic::IntrinsicType::kCeil:
case semantic::IntrinsicType::kCos:
case semantic::IntrinsicType::kCosh:
case semantic::IntrinsicType::kCross:
case semantic::IntrinsicType::kDeterminant:
case semantic::IntrinsicType::kDistance:
case semantic::IntrinsicType::kDot:
case semantic::IntrinsicType::kExp:
case semantic::IntrinsicType::kExp2:
case semantic::IntrinsicType::kFloor:
case semantic::IntrinsicType::kFma:
case semantic::IntrinsicType::kFract:
case semantic::IntrinsicType::kLength:
case semantic::IntrinsicType::kLdexp:
case semantic::IntrinsicType::kLog:
case semantic::IntrinsicType::kLog2:
case semantic::IntrinsicType::kMix:
case semantic::IntrinsicType::kNormalize:
case semantic::IntrinsicType::kPow:
case semantic::IntrinsicType::kReflect:
case semantic::IntrinsicType::kRound:
case semantic::IntrinsicType::kSelect:
case semantic::IntrinsicType::kSin:
case semantic::IntrinsicType::kSinh:
case semantic::IntrinsicType::kSqrt:
case semantic::IntrinsicType::kStep:
case semantic::IntrinsicType::kTan:
case semantic::IntrinsicType::kTanh:
case semantic::IntrinsicType::kTrunc:
case semantic::IntrinsicType::kSign:
case semantic::IntrinsicType::kClamp:
out += intrinsic->str();
break;
case semantic::IntrinsicType::kAbs:
if (intrinsic->ReturnType()->is_float_scalar_or_vector()) {
out += "fabs";
} else {
out += "abs";
}
break;
case semantic::IntrinsicType::kCountOneBits:
out += "popcount";
break;
case semantic::IntrinsicType::kDpdx:
case semantic::IntrinsicType::kDpdxCoarse:
case semantic::IntrinsicType::kDpdxFine:
out += "dfdx";
break;
case semantic::IntrinsicType::kDpdy:
case semantic::IntrinsicType::kDpdyCoarse:
case semantic::IntrinsicType::kDpdyFine:
out += "dfdy";
break;
case semantic::IntrinsicType::kFwidth:
case semantic::IntrinsicType::kFwidthCoarse:
case semantic::IntrinsicType::kFwidthFine:
out += "fwidth";
break;
case semantic::IntrinsicType::kIsFinite:
out += "isfinite";
break;
case semantic::IntrinsicType::kIsInf:
out += "isinf";
break;
case semantic::IntrinsicType::kIsNan:
out += "isnan";
break;
case semantic::IntrinsicType::kIsNormal:
out += "isnormal";
break;
case semantic::IntrinsicType::kMax:
if (intrinsic->ReturnType()->is_float_scalar_or_vector()) {
out += "fmax";
} else {
out += "max";
}
break;
case semantic::IntrinsicType::kMin:
if (intrinsic->ReturnType()->is_float_scalar_or_vector()) {
out += "fmin";
} else {
out += "min";
}
break;
case semantic::IntrinsicType::kFaceForward:
out += "faceforward";
break;
case semantic::IntrinsicType::kPack4x8Snorm:
out += "pack_float_to_snorm4x8";
break;
case semantic::IntrinsicType::kPack4x8Unorm:
out += "pack_float_to_unorm4x8";
break;
case semantic::IntrinsicType::kPack2x16Snorm:
out += "pack_float_to_snorm2x16";
break;
case semantic::IntrinsicType::kPack2x16Unorm:
out += "pack_float_to_unorm2x16";
break;
case semantic::IntrinsicType::kReverseBits:
out += "reverse_bits";
break;
case semantic::IntrinsicType::kSmoothStep:
out += "smoothstep";
break;
case semantic::IntrinsicType::kInverseSqrt:
out += "rsqrt";
break;
default:
error_ = "Unknown import method: " + std::string(intrinsic->str());
return "";
}
return out;
}
bool GeneratorImpl::EmitCase(ast::CaseStatement* stmt) {
make_indent();
if (stmt->IsDefault()) {
out_ << "default:";
} else {
bool first = true;
for (auto* selector : stmt->selectors()) {
if (!first) {
out_ << std::endl;
make_indent();
}
first = false;
out_ << "case ";
if (!EmitLiteral(selector)) {
return false;
}
out_ << ":";
}
}
out_ << " {" << std::endl;
increment_indent();
for (auto* s : *stmt->body()) {
if (!EmitStatement(s)) {
return false;
}
}
if (!last_is_break_or_fallthrough(stmt->body())) {
make_indent();
out_ << "break;" << std::endl;
}
decrement_indent();
make_indent();
out_ << "}" << std::endl;
return true;
}
bool GeneratorImpl::EmitConstructor(ast::ConstructorExpression* expr) {
if (auto* scalar = expr->As<ast::ScalarConstructorExpression>()) {
return EmitScalarConstructor(scalar);
}
return EmitTypeConstructor(expr->As<ast::TypeConstructorExpression>());
}
bool GeneratorImpl::EmitContinue(ast::ContinueStatement*) {
make_indent();
out_ << "continue;" << std::endl;
return true;
}
bool GeneratorImpl::EmitTypeConstructor(ast::TypeConstructorExpression* expr) {
if (expr->type()->Is<type::Array>()) {
out_ << "{";
} else {
if (!EmitType(expr->type(), "")) {
return false;
}
out_ << "(";
}
// If the type constructor is empty then we need to construct with the zero
// value for all components.
if (expr->values().empty()) {
if (!EmitZeroValue(expr->type())) {
return false;
}
} else {
bool first = true;
for (auto* e : expr->values()) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitExpression(e)) {
return false;
}
}
}
if (expr->type()->Is<type::Array>()) {
out_ << "}";
} else {
out_ << ")";
}
return true;
}
bool GeneratorImpl::EmitZeroValue(type::Type* type) {
if (type->Is<type::Bool>()) {
out_ << "false";
} else if (type->Is<type::F32>()) {
out_ << "0.0f";
} else if (type->Is<type::I32>()) {
out_ << "0";
} else if (type->Is<type::U32>()) {
out_ << "0u";
} else if (auto* vec = type->As<type::Vector>()) {
return EmitZeroValue(vec->type());
} else if (auto* mat = type->As<type::Matrix>()) {
return EmitZeroValue(mat->type());
} else if (auto* arr = type->As<type::Array>()) {
out_ << "{";
if (!EmitZeroValue(arr->type())) {
return false;
}
out_ << "}";
} else if (type->As<type::Struct>()) {
out_ << "{}";
} else {
error_ = "Invalid type for zero emission: " + type->type_name();
return false;
}
return true;
}
bool GeneratorImpl::EmitScalarConstructor(
ast::ScalarConstructorExpression* expr) {
return EmitLiteral(expr->literal());
}
bool GeneratorImpl::EmitLiteral(ast::Literal* lit) {
if (auto* l = lit->As<ast::BoolLiteral>()) {
out_ << (l->IsTrue() ? "true" : "false");
} else if (auto* fl = lit->As<ast::FloatLiteral>()) {
out_ << FloatToString(fl->value()) << "f";
} else if (auto* sl = lit->As<ast::SintLiteral>()) {
out_ << sl->value();
} else if (auto* ul = lit->As<ast::UintLiteral>()) {
out_ << ul->value() << "u";
} else {
error_ = "unknown literal type";
return false;
}
return true;
}
bool GeneratorImpl::EmitEntryPointData(ast::Function* func) {
auto* func_sem = program_->Sem().Get(func);
std::vector<std::pair<ast::Variable*, uint32_t>> in_locations;
std::vector<std::pair<ast::Variable*, ast::VariableDecoration*>>
out_variables;
for (auto data : func_sem->ReferencedLocationVariables()) {
auto* var = data.first;
auto* deco = data.second;
if (var->StorageClass() == ast::StorageClass::kInput) {
in_locations.push_back({var->Declaration(), deco->value()});
} else if (var->StorageClass() == ast::StorageClass::kOutput) {
out_variables.push_back({var->Declaration(), deco});
}
}
for (auto data : func_sem->ReferencedBuiltinVariables()) {
auto* var = data.first;
auto* deco = data.second;
if (var->StorageClass() == ast::StorageClass::kOutput) {
out_variables.push_back({var->Declaration(), deco});
}
}
if (!in_locations.empty()) {
auto in_struct_name =
generate_name(program_->Symbols().NameFor(func->symbol()) + "_" +
kInStructNameSuffix);
auto in_var_name = generate_name(kTintStructInVarPrefix);
ep_sym_to_in_data_[func->symbol()] = {in_struct_name, in_var_name};
make_indent();
out_ << "struct " << in_struct_name << " {" << std::endl;
increment_indent();
for (auto& data : in_locations) {
auto* var = data.first;
uint32_t loc = data.second;
make_indent();
if (!EmitType(var->type(), program_->Symbols().NameFor(var->symbol()))) {
return false;
}
out_ << " " << program_->Symbols().NameFor(var->symbol()) << " [[";
if (func->pipeline_stage() == ast::PipelineStage::kVertex) {
out_ << "attribute(" << loc << ")";
} else if (func->pipeline_stage() == ast::PipelineStage::kFragment) {
out_ << "user(locn" << loc << ")";
} else {
error_ = "invalid location variable for pipeline stage";
return false;
}
out_ << "]];" << std::endl;
}
decrement_indent();
make_indent();
out_ << "};" << std::endl << std::endl;
}
if (!out_variables.empty()) {
auto out_struct_name =
generate_name(program_->Symbols().NameFor(func->symbol()) + "_" +
kOutStructNameSuffix);
auto out_var_name = generate_name(kTintStructOutVarPrefix);
ep_sym_to_out_data_[func->symbol()] = {out_struct_name, out_var_name};
make_indent();
out_ << "struct " << out_struct_name << " {" << std::endl;
increment_indent();
for (auto& data : out_variables) {
auto* var = data.first;
auto* deco = data.second;
make_indent();
if (!EmitType(var->type(), program_->Symbols().NameFor(var->symbol()))) {
return false;
}
out_ << " " << program_->Symbols().NameFor(var->symbol()) << " [[";
if (auto* location = deco->As<ast::LocationDecoration>()) {
auto loc = location->value();
if (func->pipeline_stage() == ast::PipelineStage::kVertex) {
out_ << "user(locn" << loc << ")";
} else if (func->pipeline_stage() == ast::PipelineStage::kFragment) {
out_ << "color(" << loc << ")";
} else {
error_ = "invalid location variable for pipeline stage";
return false;
}
} else if (auto* builtin = deco->As<ast::BuiltinDecoration>()) {
auto attr = builtin_to_attribute(builtin->value());
if (attr.empty()) {
error_ = "unsupported builtin";
return false;
}
out_ << attr;
} else {
error_ = "unsupported variable decoration for entry point output";
return false;
}
out_ << "]];" << std::endl;
}
decrement_indent();
make_indent();
out_ << "};" << std::endl << std::endl;
}
return true;
}
bool GeneratorImpl::EmitExpression(ast::Expression* expr) {
if (auto* a = expr->As<ast::ArrayAccessorExpression>()) {
return EmitArrayAccessor(a);
}
if (auto* b = expr->As<ast::BinaryExpression>()) {
return EmitBinary(b);
}
if (auto* b = expr->As<ast::BitcastExpression>()) {
return EmitBitcast(b);
}
if (auto* c = expr->As<ast::CallExpression>()) {
return EmitCall(c);
}
if (auto* c = expr->As<ast::ConstructorExpression>()) {
return EmitConstructor(c);
}
if (auto* i = expr->As<ast::IdentifierExpression>()) {
return EmitIdentifier(i);
}
if (auto* m = expr->As<ast::MemberAccessorExpression>()) {
return EmitMemberAccessor(m);
}
if (auto* u = expr->As<ast::UnaryOpExpression>()) {
return EmitUnaryOp(u);
}
error_ = "unknown expression type: " + program_->str(expr);
return false;
}
void GeneratorImpl::EmitStage(ast::PipelineStage stage) {
switch (stage) {
case ast::PipelineStage::kFragment:
out_ << "fragment";
break;
case ast::PipelineStage::kVertex:
out_ << "vertex";
break;
case ast::PipelineStage::kCompute:
out_ << "kernel";
break;
case ast::PipelineStage::kNone:
break;
}
return;
}
bool GeneratorImpl::has_referenced_in_var_needing_struct(ast::Function* func) {
auto* func_sem = program_->Sem().Get(func);
for (auto data : func_sem->ReferencedLocationVariables()) {
auto* var = data.first;
if (var->StorageClass() == ast::StorageClass::kInput) {
return true;
}
}
return false;
}
bool GeneratorImpl::has_referenced_out_var_needing_struct(ast::Function* func) {
auto* func_sem = program_->Sem().Get(func);
for (auto data : func_sem->ReferencedLocationVariables()) {
auto* var = data.first;
if (var->StorageClass() == ast::StorageClass::kOutput) {
return true;
}
}
for (auto data : func_sem->ReferencedBuiltinVariables()) {
auto* var = data.first;
if (var->StorageClass() == ast::StorageClass::kOutput) {
return true;
}
}
return false;
}
bool GeneratorImpl::has_referenced_var_needing_struct(ast::Function* func) {
return has_referenced_in_var_needing_struct(func) ||
has_referenced_out_var_needing_struct(func);
}
bool GeneratorImpl::EmitFunction(ast::Function* func) {
auto* func_sem = program_->Sem().Get(func);
make_indent();
// Entry points will be emitted later, skip for now.
if (func->IsEntryPoint()) {
return true;
}
// TODO(dsinclair): This could be smarter. If the input/outputs for multiple
// entry points are the same we could generate a single struct and then have
// this determine it's the same struct and just emit once.
bool emit_duplicate_functions = func_sem->AncestorEntryPoints().size() > 0 &&
has_referenced_var_needing_struct(func);
if (emit_duplicate_functions) {
for (const auto& ep_sym : func_sem->AncestorEntryPoints()) {
if (!EmitFunctionInternal(func, emit_duplicate_functions, ep_sym)) {
return false;
}
out_ << std::endl;
}
} else {
// Emit as non-duplicated
if (!EmitFunctionInternal(func, false, Symbol())) {
return false;
}
out_ << std::endl;
}
return true;
}
bool GeneratorImpl::EmitFunctionInternal(ast::Function* func,
bool emit_duplicate_functions,
Symbol ep_sym) {
auto* func_sem = program_->Sem().Get(func);
auto name = func->symbol().to_str();
if (!EmitType(func->return_type(), "")) {
return false;
}
out_ << " ";
if (emit_duplicate_functions) {
auto func_name = name;
auto ep_name = ep_sym.to_str();
// TODO(dsinclair): The SymbolToName should go away and just use
// to_str() here when the conversion is complete.
name = generate_name(program_->Symbols().NameFor(func->symbol()) + "_" +
program_->Symbols().NameFor(ep_sym));
ep_func_name_remapped_[ep_name + "_" + func_name] = name;
} else {
// TODO(dsinclair): this should be updated to a remapped name
name = namer_.NameFor(program_->Symbols().NameFor(func->symbol()));
}
out_ << name << "(";
bool first = true;
// If we're emitting duplicate functions that means the function takes
// the stage_in or stage_out value from the entry point, emit them.
//
// We emit both of them if they're there regardless of if they're both used.
if (emit_duplicate_functions) {
auto in_it = ep_sym_to_in_data_.find(ep_sym);
if (in_it != ep_sym_to_in_data_.end()) {
out_ << "thread " << in_it->second.struct_name << "& "
<< in_it->second.var_name;
first = false;
}
auto out_it = ep_sym_to_out_data_.find(ep_sym);
if (out_it != ep_sym_to_out_data_.end()) {
if (!first) {
out_ << ", ";
}
out_ << "thread " << out_it->second.struct_name << "& "
<< out_it->second.var_name;
first = false;
}
}
for (const auto& data : func_sem->ReferencedBuiltinVariables()) {
auto* var = data.first;
if (var->StorageClass() != ast::StorageClass::kInput) {
continue;
}
if (!first) {
out_ << ", ";
}
first = false;
out_ << "thread ";
if (!EmitType(var->Declaration()->type(), "")) {
return false;
}
out_ << "& " << program_->Symbols().NameFor(var->Declaration()->symbol());
}
for (const auto& data : func_sem->ReferencedUniformVariables()) {
auto* var = data.first;
if (!first) {
out_ << ", ";
}
first = false;
out_ << "constant ";
// TODO(dsinclair): Can arrays be uniform? If so, fix this ...
if (!EmitType(var->Declaration()->type(), "")) {
return false;
}
out_ << "& " << program_->Symbols().NameFor(var->Declaration()->symbol());
}
for (const auto& data : func_sem->ReferencedStoragebufferVariables()) {
auto* var = data.first;
if (!first) {
out_ << ", ";
}
first = false;
auto* ac = var->Declaration()->type()->As<type::AccessControl>();
if (ac == nullptr) {
error_ = "invalid type for storage buffer, expected access control";
return false;
}
if (ac->IsReadOnly()) {
out_ << "const ";
}
out_ << "device ";
if (!EmitType(ac->type(), "")) {
return false;
}
out_ << "& " << program_->Symbols().NameFor(var->Declaration()->symbol());
}
for (auto* v : func->params()) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitType(v->type(), program_->Symbols().NameFor(v->symbol()))) {
return false;
}
// Array name is output as part of the type
if (!v->type()->Is<type::Array>()) {
out_ << " " << program_->Symbols().NameFor(v->symbol());
}
}
out_ << ") ";
current_ep_sym_ = ep_sym;
if (!EmitBlockAndNewline(func->body())) {
return false;
}
current_ep_sym_ = Symbol();
return true;
}
std::string GeneratorImpl::builtin_to_attribute(ast::Builtin builtin) const {
switch (builtin) {
case ast::Builtin::kPosition:
return "position";
case ast::Builtin::kVertexIndex:
return "vertex_id";
case ast::Builtin::kInstanceIndex:
return "instance_id";
case ast::Builtin::kFrontFacing:
return "front_facing";
case ast::Builtin::kFragCoord:
return "position";
case ast::Builtin::kFragDepth:
return "depth(any)";
case ast::Builtin::kLocalInvocationId:
return "thread_position_in_threadgroup";
case ast::Builtin::kLocalInvocationIndex:
return "thread_index_in_threadgroup";
case ast::Builtin::kGlobalInvocationId:
return "thread_position_in_grid";
case ast::Builtin::kSampleId:
return "sample_id";
case ast::Builtin::kSampleMaskIn:
return "sample_mask";
case ast::Builtin::kSampleMaskOut:
return "sample_mask";
default:
break;
}
return "";
}
bool GeneratorImpl::EmitEntryPointFunction(ast::Function* func) {
auto* func_sem = program_->Sem().Get(func);
make_indent();
current_ep_sym_ = func->symbol();
EmitStage(func->pipeline_stage());
out_ << " ";
// This is an entry point, the return type is the entry point output structure
// if one exists, or void otherwise.
auto out_data = ep_sym_to_out_data_.find(current_ep_sym_);
bool has_out_data = out_data != ep_sym_to_out_data_.end();
if (has_out_data) {
out_ << out_data->second.struct_name;
} else {
out_ << "void";
}
out_ << " " << namer_.NameFor(program_->Symbols().NameFor(func->symbol()))
<< "(";
bool first = true;
auto in_data = ep_sym_to_in_data_.find(current_ep_sym_);
if (in_data != ep_sym_to_in_data_.end()) {
out_ << in_data->second.struct_name << " " << in_data->second.var_name
<< " [[stage_in]]";
first = false;
}
for (auto data : func_sem->ReferencedBuiltinVariables()) {
auto* var = data.first;
if (var->StorageClass() != ast::StorageClass::kInput) {
continue;
}
if (!first) {
out_ << ", ";
}
first = false;
auto* builtin = data.second;
if (!EmitType(var->Declaration()->type(), "")) {
return false;
}
auto attr = builtin_to_attribute(builtin->value());
if (attr.empty()) {
error_ = "unknown builtin";
return false;
}
out_ << " " << program_->Symbols().NameFor(var->Declaration()->symbol())
<< " [[" << attr << "]]";
}
for (auto data : func_sem->ReferencedUniformVariables()) {
if (!first) {
out_ << ", ";
}
first = false;
auto* var = data.first;
// TODO(dsinclair): We're using the binding to make up the buffer number but
// we should instead be using a provided mapping that uses both buffer and
// set. https://bugs.chromium.org/p/tint/issues/detail?id=104
auto* binding = data.second.binding;
if (binding == nullptr) {
error_ = "unable to find binding information for uniform: " +
program_->Symbols().NameFor(var->Declaration()->symbol());
return false;
}
// auto* set = data.second.set;
out_ << "constant ";
// TODO(dsinclair): Can you have a uniform array? If so, this needs to be
// updated to handle arrays property.
if (!EmitType(var->Declaration()->type(), "")) {
return false;
}
out_ << "& " << program_->Symbols().NameFor(var->Declaration()->symbol())
<< " [[buffer(" << binding->value() << ")]]";
}
for (auto data : func_sem->ReferencedStoragebufferVariables()) {
if (!first) {
out_ << ", ";
}
first = false;
auto* var = data.first;
// TODO(dsinclair): We're using the binding to make up the buffer number but
// we should instead be using a provided mapping that uses both buffer and
// set. https://bugs.chromium.org/p/tint/issues/detail?id=104
auto* binding = data.second.binding;
// auto* set = data.second.set;
auto* ac = var->Declaration()->type()->As<type::AccessControl>();
if (ac == nullptr) {
error_ = "invalid type for storage buffer, expected access control";
return false;
}
if (ac->IsReadOnly()) {
out_ << "const ";
}
out_ << "device ";
if (!EmitType(ac->type(), "")) {
return false;
}
out_ << "& " << program_->Symbols().NameFor(var->Declaration()->symbol())
<< " [[buffer(" << binding->value() << ")]]";
}
out_ << ") {" << std::endl;
increment_indent();
if (has_out_data) {
make_indent();
out_ << out_data->second.struct_name << " " << out_data->second.var_name
<< " = {};" << std::endl;
}
generating_entry_point_ = true;
for (auto* s : *func->body()) {
if (!EmitStatement(s)) {
return false;
}
}
auto* last_statement = func->get_last_statement();
if (last_statement == nullptr ||
!last_statement->Is<ast::ReturnStatement>()) {
ast::ReturnStatement ret(Source{});
if (!EmitStatement(&ret)) {
return false;
}
}
generating_entry_point_ = false;
decrement_indent();
make_indent();
out_ << "}" << std::endl;
current_ep_sym_ = Symbol();
return true;
}
bool GeneratorImpl::global_is_in_struct(const semantic::Variable* var) const {
bool in_or_out_struct_has_location =
var != nullptr && var->Declaration()->HasLocationDecoration() &&
(var->StorageClass() == ast::StorageClass::kInput ||
var->StorageClass() == ast::StorageClass::kOutput);
bool in_struct_has_builtin =
var != nullptr && var->Declaration()->HasBuiltinDecoration() &&
var->StorageClass() == ast::StorageClass::kOutput;
return in_or_out_struct_has_location || in_struct_has_builtin;
}
bool GeneratorImpl::EmitIdentifier(ast::IdentifierExpression* expr) {
auto* ident = expr->As<ast::IdentifierExpression>();
const semantic::Variable* var = nullptr;
if (global_variables_.get(ident->symbol(), &var)) {
if (global_is_in_struct(var)) {
auto var_type = var->StorageClass() == ast::StorageClass::kInput
? VarType::kIn
: VarType::kOut;
auto name = current_ep_var_name(var_type);
if (name.empty()) {
error_ = "unable to find entry point data for variable";
return false;
}
out_ << name << ".";
}
}
out_ << namer_.NameFor(program_->Symbols().NameFor(ident->symbol()));
return true;
}
bool GeneratorImpl::EmitLoop(ast::LoopStatement* stmt) {
loop_emission_counter_++;
std::string guard = namer_.NameFor("tint_msl_is_first_" +
std::to_string(loop_emission_counter_));
if (stmt->has_continuing()) {
make_indent();
// Continuing variables get their own scope.
out_ << "{" << std::endl;
increment_indent();
make_indent();
out_ << "bool " << guard << " = true;" << std::endl;
// A continuing block may use variables declared in the method body. As a
// first pass, if we have a continuing, we pull all declarations outside
// the for loop into the continuing scope. Then, the variable declarations
// will be turned into assignments.
for (auto* s : *(stmt->body())) {
if (auto* decl = s->As<ast::VariableDeclStatement>()) {
if (!EmitVariable(program_->Sem().Get(decl->variable()), true)) {
return false;
}
}
}
}
make_indent();
out_ << "for(;;) {" << std::endl;
increment_indent();
if (stmt->has_continuing()) {
make_indent();
out_ << "if (!" << guard << ") ";
if (!EmitBlockAndNewline(stmt->continuing())) {
return false;
}
make_indent();
out_ << guard << " = false;" << std::endl;
out_ << std::endl;
}
for (auto* s : *(stmt->body())) {
// If we have a continuing block we've already emitted the variable
// declaration before the loop, so treat it as an assignment.
auto* decl = s->As<ast::VariableDeclStatement>();
if (decl != nullptr && stmt->has_continuing()) {
make_indent();
auto* var = decl->variable();
out_ << program_->Symbols().NameFor(var->symbol()) << " = ";
if (var->constructor() != nullptr) {
if (!EmitExpression(var->constructor())) {
return false;
}
} else {
if (!EmitZeroValue(var->type())) {
return false;
}
}
out_ << ";" << std::endl;
continue;
}
if (!EmitStatement(s)) {
return false;
}
}
decrement_indent();
make_indent();
out_ << "}" << std::endl;
// Close the scope for any continuing variables.
if (stmt->has_continuing()) {
decrement_indent();
make_indent();
out_ << "}" << std::endl;
}
return true;
}
bool GeneratorImpl::EmitDiscard(ast::DiscardStatement*) {
make_indent();
// TODO(dsinclair): Verify this is correct when the discard semantics are
// defined for WGSL (https://github.com/gpuweb/gpuweb/issues/361)
out_ << "discard_fragment();" << std::endl;
return true;
}
bool GeneratorImpl::EmitElse(ast::ElseStatement* stmt) {
if (stmt->HasCondition()) {
out_ << " else if (";
if (!EmitExpression(stmt->condition())) {
return false;
}
out_ << ") ";
} else {
out_ << " else ";
}
return EmitBlock(stmt->body());
}
bool GeneratorImpl::EmitIf(ast::IfStatement* stmt) {
make_indent();
out_ << "if (";
if (!EmitExpression(stmt->condition())) {
return false;
}
out_ << ") ";
if (!EmitBlock(stmt->body())) {
return false;
}
for (auto* e : stmt->else_statements()) {
if (!EmitElse(e)) {
return false;
}
}
out_ << std::endl;
return true;
}
bool GeneratorImpl::EmitMemberAccessor(ast::MemberAccessorExpression* expr) {
if (!EmitExpression(expr->structure())) {
return false;
}
out_ << ".";
// Swizzles get written out directly
if (program_->Sem().Get(expr)->IsSwizzle()) {
out_ << program_->Symbols().NameFor(expr->member()->symbol());
} else if (!EmitExpression(expr->member())) {
return false;
}
return true;
}
bool GeneratorImpl::EmitReturn(ast::ReturnStatement* stmt) {
make_indent();
out_ << "return";
if (generating_entry_point_) {
auto out_data = ep_sym_to_out_data_.find(current_ep_sym_);
if (out_data != ep_sym_to_out_data_.end()) {
out_ << " " << out_data->second.var_name;
}
} else if (stmt->has_value()) {
out_ << " ";
if (!EmitExpression(stmt->value())) {
return false;
}
}
out_ << ";" << std::endl;
return true;
}
bool GeneratorImpl::EmitBlock(const ast::BlockStatement* stmt) {
out_ << "{" << std::endl;
increment_indent();
for (auto* s : *stmt) {
if (!EmitStatement(s)) {
return false;
}
}
decrement_indent();
make_indent();
out_ << "}";
return true;
}
bool GeneratorImpl::EmitBlockAndNewline(const ast::BlockStatement* stmt) {
const bool result = EmitBlock(stmt);
if (result) {
out_ << std::endl;
}
return result;
}
bool GeneratorImpl::EmitIndentedBlockAndNewline(ast::BlockStatement* stmt) {
make_indent();
const bool result = EmitBlock(stmt);
if (result) {
out_ << std::endl;
}
return result;
}
bool GeneratorImpl::EmitStatement(ast::Statement* stmt) {
if (auto* a = stmt->As<ast::AssignmentStatement>()) {
return EmitAssign(a);
}
if (auto* b = stmt->As<ast::BlockStatement>()) {
return EmitIndentedBlockAndNewline(b);
}
if (auto* b = stmt->As<ast::BreakStatement>()) {
return EmitBreak(b);
}
if (auto* c = stmt->As<ast::CallStatement>()) {
make_indent();
if (!EmitCall(c->expr())) {
return false;
}
out_ << ";" << std::endl;
return true;
}
if (auto* c = stmt->As<ast::ContinueStatement>()) {
return EmitContinue(c);
}
if (auto* d = stmt->As<ast::DiscardStatement>()) {
return EmitDiscard(d);
}
if (stmt->As<ast::FallthroughStatement>()) {
make_indent();
out_ << "/* fallthrough */" << std::endl;
return true;
}
if (auto* i = stmt->As<ast::IfStatement>()) {
return EmitIf(i);
}
if (auto* l = stmt->As<ast::LoopStatement>()) {
return EmitLoop(l);
}
if (auto* r = stmt->As<ast::ReturnStatement>()) {
return EmitReturn(r);
}
if (auto* s = stmt->As<ast::SwitchStatement>()) {
return EmitSwitch(s);
}
if (auto* v = stmt->As<ast::VariableDeclStatement>()) {
auto* var = program_->Sem().Get(v->variable());
return EmitVariable(var, false);
}
error_ = "unknown statement type: " + program_->str(stmt);
return false;
}
bool GeneratorImpl::EmitSwitch(ast::SwitchStatement* stmt) {
make_indent();
out_ << "switch(";
if (!EmitExpression(stmt->condition())) {
return false;
}
out_ << ") {" << std::endl;
increment_indent();
for (auto* s : stmt->body()) {
if (!EmitCase(s)) {
return false;
}
}
decrement_indent();
make_indent();
out_ << "}" << std::endl;
return true;
}
bool GeneratorImpl::EmitType(type::Type* type, const std::string& name) {
std::string access_str = "";
if (auto* ac = type->As<type::AccessControl>()) {
if (ac->access_control() == ast::AccessControl::kReadOnly) {
access_str = "read";
} else if (ac->access_control() == ast::AccessControl::kWriteOnly) {
access_str = "write";
} else {
error_ = "Invalid access control for storage texture";
return false;
}
type = ac->type();
}
if (auto* alias = type->As<type::Alias>()) {
out_ << namer_.NameFor(program_->Symbols().NameFor(alias->symbol()));
} else if (auto* ary = type->As<type::Array>()) {
type::Type* base_type = ary;
std::vector<uint32_t> sizes;
while (auto* arr = base_type->As<type::Array>()) {
if (arr->IsRuntimeArray()) {
sizes.push_back(1);
} else {
sizes.push_back(arr->size());
}
base_type = arr->type();
}
if (!EmitType(base_type, "")) {
return false;
}
if (!name.empty()) {
out_ << " " << namer_.NameFor(name);
}
for (uint32_t size : sizes) {
out_ << "[" << size << "]";
}
} else if (type->Is<type::Bool>()) {
out_ << "bool";
} else if (type->Is<type::F32>()) {
out_ << "float";
} else if (type->Is<type::I32>()) {
out_ << "int";
} else if (auto* mat = type->As<type::Matrix>()) {
if (!EmitType(mat->type(), "")) {
return false;
}
out_ << mat->columns() << "x" << mat->rows();
} else if (auto* ptr = type->As<type::Pointer>()) {
// TODO(dsinclair): Storage class?
if (!EmitType(ptr->type(), "")) {
return false;
}
out_ << "*";
} else if (type->Is<type::Sampler>()) {
out_ << "sampler";
} else if (auto* str = type->As<type::Struct>()) {
// The struct type emits as just the name. The declaration would be emitted
// as part of emitting the constructed types.
out_ << program_->Symbols().NameFor(str->symbol());
} else if (auto* tex = type->As<type::Texture>()) {
if (tex->Is<type::DepthTexture>()) {
out_ << "depth";
} else {
out_ << "texture";
}
switch (tex->dim()) {
case type::TextureDimension::k1d:
out_ << "1d";
break;
case type::TextureDimension::k1dArray:
out_ << "1d_array";
break;
case type::TextureDimension::k2d:
out_ << "2d";
break;
case type::TextureDimension::k2dArray:
out_ << "2d_array";
break;
case type::TextureDimension::k3d:
out_ << "3d";
break;
case type::TextureDimension::kCube:
out_ << "cube";
break;
case type::TextureDimension::kCubeArray:
out_ << "cube_array";
break;
default:
error_ = "Invalid texture dimensions";
return false;
}
if (tex->Is<type::MultisampledTexture>()) {
out_ << "_ms";
}
out_ << "<";
if (tex->Is<type::DepthTexture>()) {
out_ << "float, access::sample";
} else if (auto* storage = tex->As<type::StorageTexture>()) {
if (!EmitType(storage->type(), "")) {
return false;
}
out_ << ", access::" << access_str;
} else if (auto* ms = tex->As<type::MultisampledTexture>()) {
if (!EmitType(ms->type(), "")) {
return false;
}
out_ << ", access::sample";
} else if (auto* sampled = tex->As<type::SampledTexture>()) {
if (!EmitType(sampled->type(), "")) {
return false;
}
out_ << ", access::sample";
} else {
error_ = "invalid texture type";
return false;
}
out_ << ">";
} else if (type->Is<type::U32>()) {
out_ << "uint";
} else if (auto* vec = type->As<type::Vector>()) {
if (!EmitType(vec->type(), "")) {
return false;
}
out_ << vec->size();
} else if (type->Is<type::Void>()) {
out_ << "void";
} else {
error_ = "unknown type in EmitType: " + type->type_name();
return false;
}
return true;
}
bool GeneratorImpl::EmitStructType(const type::Struct* str) {
// TODO(dsinclair): Block decoration?
// if (str->impl()->decoration() != ast::StructDecoration::kNone) {
// }
out_ << "struct " << program_->Symbols().NameFor(str->symbol()) << " {"
<< std::endl;
increment_indent();
uint32_t current_offset = 0;
uint32_t pad_count = 0;
for (auto* mem : str->impl()->members()) {
make_indent();
for (auto* deco : mem->decorations()) {
if (auto* o = deco->As<ast::StructMemberOffsetDecoration>()) {
uint32_t offset = o->offset();
if (offset != current_offset) {
out_ << "int8_t pad_" << pad_count << "[" << (offset - current_offset)
<< "];" << std::endl;
pad_count++;
make_indent();
}
current_offset = offset;
} else {
error_ = "unsupported member decoration: " + program_->str(deco);
return false;
}
}
if (!EmitType(mem->type(), program_->Symbols().NameFor(mem->symbol()))) {
return false;
}
auto size = calculate_alignment_size(mem->type());
if (size == 0) {
error_ = "unable to calculate byte size for: " + mem->type()->type_name();
return false;
}
current_offset += size;
// Array member name will be output with the type
if (!mem->type()->Is<type::Array>()) {
out_ << " " << namer_.NameFor(program_->Symbols().NameFor(mem->symbol()));
}
out_ << ";" << std::endl;
}
decrement_indent();
make_indent();
out_ << "};" << std::endl;
return true;
}
bool GeneratorImpl::EmitUnaryOp(ast::UnaryOpExpression* expr) {
switch (expr->op()) {
case ast::UnaryOp::kNot:
out_ << "!";
break;
case ast::UnaryOp::kNegation:
out_ << "-";
break;
}
out_ << "(";
if (!EmitExpression(expr->expr())) {
return false;
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitVariable(const semantic::Variable* var,
bool skip_constructor) {
make_indent();
auto* decl = var->Declaration();
// TODO(dsinclair): Handle variable decorations
if (!decl->decorations().empty()) {
error_ = "Variable decorations are not handled yet";
return false;
}
if (decl->is_const()) {
out_ << "const ";
}
if (!EmitType(decl->type(), program_->Symbols().NameFor(decl->symbol()))) {
return false;
}
if (!decl->type()->Is<type::Array>()) {
out_ << " " << program_->Symbols().NameFor(decl->symbol());
}
if (!skip_constructor) {
out_ << " = ";
if (decl->constructor() != nullptr) {
if (!EmitExpression(decl->constructor())) {
return false;
}
} else if (var->StorageClass() == ast::StorageClass::kPrivate ||
var->StorageClass() == ast::StorageClass::kFunction ||
var->StorageClass() == ast::StorageClass::kNone ||
var->StorageClass() == ast::StorageClass::kOutput) {
if (!EmitZeroValue(decl->type())) {
return false;
}
}
}
out_ << ";" << std::endl;
return true;
}
bool GeneratorImpl::EmitProgramConstVariable(const ast::Variable* var) {
make_indent();
for (auto* d : var->decorations()) {
if (!d->Is<ast::ConstantIdDecoration>()) {
error_ = "Decorated const values not valid";
return false;
}
}
if (!var->is_const()) {
error_ = "Expected a const value";
return false;
}
out_ << "constant ";
if (!EmitType(var->type(), program_->Symbols().NameFor(var->symbol()))) {
return false;
}
if (!var->type()->Is<type::Array>()) {
out_ << " " << program_->Symbols().NameFor(var->symbol());
}
if (var->HasConstantIdDecoration()) {
out_ << " [[function_constant(" << var->constant_id() << ")]]";
} else if (var->constructor() != nullptr) {
out_ << " = ";
if (!EmitExpression(var->constructor())) {
return false;
}
}
out_ << ";" << std::endl;
return true;
}
} // namespace msl
} // namespace writer
} // namespace tint
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