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// SPDX-License-Identifier: GPL-3.0-or-later
#include "Common/CodeGenTarget.h"
#include "TableGenBackends.h"
#include "rcc/TableGen/Parser.h"
#include <algorithm>
#include <cstddef>
#include <ranges>
#include <string>
#include <string_view>
#include <unordered_set>
#include <utility>
namespace rcc::targetgen {
[[nodiscard]] bool isPowerOfTwo(std::uint64_t Value) noexcept {
return Value != 0 && (Value & (Value - 1U)) == 0;
}
CodeGenTarget::CodeGenTarget(const DescriptionAST &Input, std::string SourceName)
: Input(Input), SourceName(std::move(SourceName)) {}
[[nodiscard]] std::optional<NormalizedTargetModel> CodeGenTarget::normalize() {
if (!validateTarget())
return std::nullopt;
NormalizedTargetModel Result;
Result.Target = Input.Target;
Result.RegisterUnits = Input.RegisterUnits;
Result.MIROperandFlags = Input.MIROperandFlags;
if (!normalizeRegisterUnits() || !normalizeRegisters(Result) || !normalizeRegisterBanks(Result) ||
!normalizeRegisterClasses(Result) || !normalizeRegisterMasks(Result) ||
!normalizeMIROperandFlags(Result) || !normalizeCallingConventions(Result) ||
!normalizeNamedOperands(Result) || !normalizeImmediatePredicates(Result) ||
!normalizeSchedulingClasses(Result) || !normalizeEncodingCategories(Result) ||
!normalizeAssemblyFormats(Result) || !normalizeInstructions(Result) ||
!normalizeSelectionRules(Result) || !normalizeCombinerRules(Result) ||
!normalizeMacroFusionRules(Result) || !normalizeMCPseudoExpansions(Result)) {
return std::nullopt;
}
std::ranges::sort(Result.RegisterUnits, {}, &SourceRegisterUnit::ID);
std::ranges::sort(Result.Registers, {}, &NormalizedRegister::ID);
std::ranges::sort(Result.RegisterBanks, {}, &NormalizedRegisterBank::ID);
std::ranges::sort(Result.RegisterClasses, {}, &NormalizedRegisterClass::ID);
std::ranges::sort(Result.CallingConventions, {}, &NormalizedCallingConvention::ID);
std::ranges::sort(Result.NamedOperands, {}, &NormalizedNamedOperand::ID);
std::ranges::sort(Result.ImmediatePredicates, {}, &NormalizedImmediatePredicate::ID);
std::ranges::sort(Result.SchedulingClasses, {}, &NormalizedSchedulingClass::ID);
std::ranges::sort(Result.EncodingCategories, {}, &NormalizedEncodingCategory::ID);
std::ranges::sort(Result.AssemblyFormats, {}, &NormalizedAssemblyFormat::ID);
return Result;
}
[[nodiscard]] std::vector<TextDiagnostic> CodeGenTarget::takeDiagnostics() {
return std::move(Diagnostics);
}
void CodeGenTarget::fail(TextRange Range, std::string Message) {
Diagnostics.push_back({
.Severity = DiagnosticSeverity::Error,
.Category = "target-description",
.Message = std::move(Message),
.SourceName = SourceName,
.Range = Range,
});
}
[[nodiscard]] bool CodeGenTarget::validateTarget() {
if (!isIdentifier(Input.Target.Namespace)) {
fail(Input.Target.Range, "target namespace must be a C++ identifier");
return false;
}
if (Input.Target.Name.empty() || Input.Target.Triple.empty() || Input.Target.CPU.empty() ||
Input.Target.ABI.empty() || Input.Target.DataLayout.empty() ||
Input.Target.Features.empty()) {
fail(Input.Target.Range, "target metadata fields and feature list must be nonempty");
return false;
}
std::unordered_set<std::string> Features;
for (const std::string &Feature : Input.Target.Features) {
if (Feature.empty() || !Features.insert(Feature).second) {
fail(Input.Target.Range, "target feature names must be nonempty and unique");
return false;
}
}
return true;
}
[[nodiscard]] bool CodeGenTarget::normalizeCallingConventions(NormalizedTargetModel &Result) {
if (Input.CallingConventions.empty()) {
fail(Input.Target.Range, "target description requires at least one calling convention");
return false;
}
std::unordered_set<std::uint32_t> IDs;
std::unordered_set<std::string> Symbols;
std::unordered_set<std::string> Names;
for (const SourceCallingConvention &Convention : Input.CallingConventions) {
const auto IntegerClass = ClassBySymbol.find(Convention.IntegerRegisterClassSymbol);
const auto FloatingClass = ClassBySymbol.find(Convention.FloatingRegisterClassSymbol);
const auto PreservedMask = std::ranges::find(Result.RegisterMasks, Convention.PreservedMaskName,
&NormalizedRegisterMask::Name);
if (Convention.ID == 0 || !isIdentifier(Convention.Symbol) || Convention.Name.empty() ||
IntegerClass == ClassBySymbol.end() || FloatingClass == ClassBySymbol.end() ||
PreservedMask == Result.RegisterMasks.end() || Convention.StackAlignmentBytes == 0 ||
Convention.StackArgumentAlignmentBytes == 0 ||
!isPowerOfTwo(Convention.StackAlignmentBytes) ||
!isPowerOfTwo(Convention.StackArgumentAlignmentBytes) ||
Convention.StackAlignmentBytes % Convention.StackArgumentAlignmentBytes != 0 ||
Convention.ShadowSpaceBytes % Convention.StackArgumentAlignmentBytes != 0 ||
!IDs.insert(Convention.ID).second || !Symbols.insert(Convention.Symbol).second ||
!Names.insert(Convention.Name).second) {
fail(Convention.Range,
"calling conventions require unique IDs, symbols, names, declared register classes and "
"preserved masks, compatible power-of-two stack alignments, and aligned shadow space");
return false;
}
const auto IntegerClassDescription = std::ranges::find(
Result.RegisterClasses, IntegerClass->second, &NormalizedRegisterClass::ID);
const auto FloatingClassDescription = std::ranges::find(
Result.RegisterClasses, FloatingClass->second, &NormalizedRegisterClass::ID);
if (IntegerClassDescription == Result.RegisterClasses.end() ||
FloatingClassDescription == Result.RegisterClasses.end()) {
fail(Convention.Range, "calling convention register classes must resolve");
return false;
}
const auto NormalizeRegisterList = [this,
&Convention](const std::vector<std::string> &Symbols,
const NormalizedRegisterClass &RegisterClass,
std::vector<std::uint32_t> &Output) {
std::unordered_set<std::uint32_t> Registers;
for (const std::string &Symbol : Symbols) {
const auto Register = RegisterBySymbol.find(Symbol);
if (Register == RegisterBySymbol.end() ||
!std::ranges::contains(RegisterClass.Registers, Register->second) ||
!Registers.insert(Register->second).second) {
fail(Convention.Range,
"calling convention register lists must contain distinct members of their class");
return false;
}
Output.push_back(Register->second);
}
return true;
};
NormalizedCallingConvention Normalized{
.ID = Convention.ID,
.Symbol = Convention.Symbol,
.Name = Convention.Name,
.IntegerRegisterClass = IntegerClass->second,
.FloatingRegisterClass = FloatingClass->second,
.IntegerArgumentRegisters = {},
.FloatingArgumentRegisters = {},
.IntegerReturnRegisters = {},
.FloatingReturnRegisters = {},
.PreservedMaskName = Convention.PreservedMaskName,
.StackAlignmentBytes = Convention.StackAlignmentBytes,
.StackArgumentAlignmentBytes = Convention.StackArgumentAlignmentBytes,
.ShadowSpaceBytes = Convention.ShadowSpaceBytes,
.SupportsVarArgs = Convention.SupportsVarArgs,
.SupportsTailCalls = Convention.SupportsTailCalls,
};
if (!NormalizeRegisterList(Convention.IntegerArgumentRegisterSymbols, *IntegerClassDescription,
Normalized.IntegerArgumentRegisters) ||
!NormalizeRegisterList(Convention.FloatingArgumentRegisterSymbols,
*FloatingClassDescription, Normalized.FloatingArgumentRegisters) ||
!NormalizeRegisterList(Convention.IntegerReturnRegisterSymbols, *IntegerClassDescription,
Normalized.IntegerReturnRegisters) ||
!NormalizeRegisterList(Convention.FloatingReturnRegisterSymbols, *FloatingClassDescription,
Normalized.FloatingReturnRegisters)) {
return false;
}
CallingConventionBySymbol.emplace(Convention.Symbol, Convention.ID);
Result.CallingConventions.push_back(std::move(Normalized));
}
return true;
}
[[nodiscard]] const NormalizedRegister &findRegister(const NormalizedTargetModel &Model,
std::uint32_t ID) {
const auto Position = std::ranges::find(Model.Registers, ID, &NormalizedRegister::ID);
return *Position;
}
[[nodiscard]] const SourceRegisterUnit &findRegisterUnit(const NormalizedTargetModel &Model,
std::uint32_t ID) {
const auto Position = std::ranges::find(Model.RegisterUnits, ID, &SourceRegisterUnit::ID);
return *Position;
}
[[nodiscard]] const NormalizedRegisterBank &findRegisterBank(const NormalizedTargetModel &Model,
std::uint32_t ID) {
const auto Position = std::ranges::find(Model.RegisterBanks, ID, &NormalizedRegisterBank::ID);
return *Position;
}
DescriptionGenerationResult generateDescription(const std::string &SourceName,
std::string SourceText) {
DescriptionParseResult ParseResult = parseDescription(SourceName, std::move(SourceText));
if (!ParseResult.Records)
return {.Output = std::nullopt, .Diagnostics = std::move(ParseResult.Diagnostics)};
CodeGenTarget Target(*ParseResult.Records, SourceName);
auto Model = Target.normalize();
if (!Model)
return {.Output = std::nullopt, .Diagnostics = Target.takeDiagnostics()};
const std::size_t Separator = SourceName.find_last_of("/\\");
const std::string_view DisplayName = Separator == std::string::npos
? std::string_view(SourceName)
: std::string_view(SourceName).substr(Separator + 1);
return {
.Output =
GeneratedDescription{
.RegisterHeader = emitRegisterHeader(*Model, DisplayName),
.InstructionHeader = emitInstructionHeader(*Model, DisplayName),
.TargetTables = emitRegisterInfo(*Model, DisplayName) + emitInstructionInfo(*Model) +
emitSubtarget(*Model) + emitCodeEmitter(*Model) +
emitAssemblyWriter(*Model) + emitSearchableTables(*Model) +
emitCallingConventions(*Model),
.GlobalISel = emitGlobalISel(*Model, DisplayName),
.GlobalISelCombiner = emitGlobalISelCombiner(*Model, DisplayName),
.MacroFusion = emitMacroFusion(*Model, DisplayName),
.MCPseudoLowering = emitMCPseudoLowering(*Model, DisplayName),
},
.Diagnostics = {},
};
}
} // namespace rcc::targetgen
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