src/tint/lang/wgsl/reader/reader.cc

// Copyright 2020 The Dawn & Tint Authors
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#include "src/tint/lang/wgsl/reader/reader.h"

#include <limits>
#include <utility>

#include "src/tint/lang/wgsl/reader/lower/lower.h"
#include "src/tint/lang/wgsl/reader/parser/parser.h"
#include "src/tint/lang/wgsl/reader/program_to_ir/program_to_ir.h"
#include "src/tint/lang/wgsl/resolver/resolve.h"

namespace tint::wgsl::reader {

Program Parse(const Source::File* file, const Options& options) {
    if (TINT_UNLIKELY(file->content.data.size() >
                      static_cast<size_t>(std::numeric_limits<uint32_t>::max()))) {
        ProgramBuilder b;
        b.Diagnostics().AddError(tint::Source{}) << "WGSL source must be 0xffffffff bytes or fewer";
        return Program(std::move(b));
    }
    Parser parser(file);
    parser.Parse();
    return resolver::Resolve(parser.builder(), options.allowed_features);
}

Result<core::ir::Module> WgslToIR(const Source::File* file, const Options& options) {
    Program program = Parse(file, options);
    auto module = ProgramToIR(program);
    if (module != Success) {
        return module.Failure();
    }
    // WGSL-dialect -> core-dialect
    if (auto res = Lower(module.Get()); res != Success) {
        return res.Failure();
    }
    return module;
}

tint::Result<core::ir::Module> ProgramToLoweredIR(const Program& program) {
    auto ir = tint::wgsl::reader::ProgramToIR(program);
    if (ir != Success) {
        return ir.Failure();
    }

    // Lower from WGSL-dialect to core-dialect
    auto res = tint::wgsl::reader::Lower(ir.Get());
    if (res != Success) {
        return res.Failure();
    }

    return ir;
}

bool IsUnsupportedByIR(const ast::Enable* enable) {
    for (auto ext : enable->extensions) {
        switch (ext->name) {
            case tint::wgsl::Extension::kChromiumExperimentalFramebufferFetch:
            case tint::wgsl::Extension::kChromiumExperimentalPixelLocal:
            case tint::wgsl::Extension::kChromiumExperimentalPushConstant:
            case tint::wgsl::Extension::kChromiumInternalRelaxedUniformLayout:
                return true;
            default:
                break;
        }
    }
    return false;
}

}  // namespace tint::wgsl::reader