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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/MachineFunctionRecords.h"
#include "rcc/CodeGen/MachineFunctionCloner.h"
#include <algorithm>
#include <cstddef>
#include <string>
#include <unordered_set>
#include <utility>
namespace rcc {
namespace {
[[nodiscard]] Expected<void>
verifyCalleeSavedRegisters(std::span<const PhysicalRegister> Registers) {
std::unordered_set<PhysicalRegister> Seen;
for (const PhysicalRegister Reg : Registers) {
if (!Reg.isValid()) {
return makeUnexpected(ErrorCode::VerificationError,
"callee-saved register list contains noreg");
}
if (!Seen.insert(Reg).second) {
return makeUnexpected(ErrorCode::VerificationError,
"callee-saved register list contains a duplicate register");
}
}
return {};
}
[[nodiscard]] Expected<void> verifyCallSite(const MachineCallSiteInfo &CallSite) {
if (!CallSite.CallInstruction.isValid()) {
return makeUnexpected(ErrorCode::VerificationError,
"call-site record has an invalid instruction StableID");
}
for (const MachineCallSiteArgument &Argument : CallSite.ForwardedArguments) {
if (!Argument.Reg.isValid()) {
return makeUnexpected(ErrorCode::VerificationError,
"call-site forwarded argument contains noreg");
}
}
return {};
}
[[nodiscard]] Expected<void> verifyCalledGlobal(const MachineCalledGlobal &CalledGlobal) {
if (!CalledGlobal.CallInstruction.isValid()) {
return makeUnexpected(ErrorCode::VerificationError,
"called-global record has an invalid instruction StableID");
}
if (CalledGlobal.Callee.empty()) {
return makeUnexpected(ErrorCode::VerificationError,
"called-global record has an empty callee name");
}
return {};
}
} // namespace
Expected<void>
MachineFunctionRecords::setCalleeSavedRegisters(std::vector<PhysicalRegister> Registers) {
auto Verification = verifyCalleeSavedRegisters(Registers);
if (!Verification)
return std::unexpected(Verification.error());
CalleeSavedRegisters = std::move(Registers);
return {};
}
Expected<void> MachineFunctionRecords::addCallSite(MachineCallSiteInfo CallSite) {
auto Verification = verifyCallSite(CallSite);
if (!Verification)
return std::unexpected(Verification.error());
if (std::ranges::any_of(CallSites, [&CallSite](const MachineCallSiteInfo &Existing) {
return Existing.CallInstruction == CallSite.CallInstruction;
})) {
return makeUnexpected(ErrorCode::InvalidArgument,
"call instruction already has a call-site record");
}
CallSites.push_back(std::move(CallSite));
return {};
}
Expected<void> MachineFunctionRecords::addCalledGlobal(MachineCalledGlobal CalledGlobal) {
auto Verification = verifyCalledGlobal(CalledGlobal);
if (!Verification)
return std::unexpected(Verification.error());
if (std::ranges::any_of(CalledGlobals, [&CalledGlobal](const MachineCalledGlobal &Existing) {
return Existing.CallInstruction == CalledGlobal.CallInstruction;
})) {
return makeUnexpected(ErrorCode::InvalidArgument,
"call instruction already has a called-global record");
}
CalledGlobals.push_back(std::move(CalledGlobal));
return {};
}
Expected<void> MachineFunctionRecords::addPrefetchTarget(MachinePrefetchTarget Target) {
if (std::ranges::find(PrefetchTargets, Target) != PrefetchTargets.end()) {
return makeUnexpected(ErrorCode::InvalidArgument, "prefetch target is already recorded");
}
PrefetchTargets.push_back(Target);
return {};
}
Expected<void> MachineFunctionRecords::verify() const {
if (CalleeSavedRegisters) {
auto CalleeSavedVerification = verifyCalleeSavedRegisters(*CalleeSavedRegisters);
if (!CalleeSavedVerification)
return CalleeSavedVerification;
}
std::unordered_set<MachineInstrStableID> CallInstructions;
for (const MachineCallSiteInfo &CallSite : CallSites) {
auto CallSiteVerification = verifyCallSite(CallSite);
if (!CallSiteVerification)
return CallSiteVerification;
if (!CallInstructions.insert(CallSite.CallInstruction).second) {
return makeUnexpected(ErrorCode::VerificationError,
"multiple call-site records reference one call instruction");
}
}
std::unordered_set<MachineInstrStableID> CalledGlobalInstructions;
for (const MachineCalledGlobal &CalledGlobal : CalledGlobals) {
auto CalledGlobalVerification = verifyCalledGlobal(CalledGlobal);
if (!CalledGlobalVerification)
return CalledGlobalVerification;
if (!CalledGlobalInstructions.insert(CalledGlobal.CallInstruction).second) {
return makeUnexpected(ErrorCode::VerificationError,
"multiple called-global records reference one call instruction");
}
}
for (std::size_t Index = 0; Index < PrefetchTargets.size(); ++Index) {
if (std::ranges::find(PrefetchTargets.begin() + static_cast<std::ptrdiff_t>(Index + 1),
PrefetchTargets.end(), PrefetchTargets[Index]) != PrefetchTargets.end()) {
return makeUnexpected(ErrorCode::VerificationError,
"prefetch target list contains a duplicate entry");
}
}
return {};
}
Expected<MachineFunctionRecords>
MachineFunctionRecords::clone(const MachineFunctionCloneContext &CloneContext) const {
auto Verification = verify();
if (!Verification)
return std::unexpected(Verification.error());
MachineFunctionRecords Result;
if (CalleeSavedRegisters) {
auto SetResult = Result.setCalleeSavedRegisters(*CalleeSavedRegisters);
if (!SetResult)
return std::unexpected(SetResult.error());
}
for (const MachineCallSiteInfo &Source : CallSites) {
auto Instruction = CloneContext.mapInstructionStableID(Source.CallInstruction);
if (!Instruction)
return std::unexpected(Instruction.error());
MachineCallSiteInfo Destination = Source;
Destination.CallInstruction = *Instruction;
auto AddResult = Result.addCallSite(std::move(Destination));
if (!AddResult)
return std::unexpected(AddResult.error());
}
for (const MachineCalledGlobal &Source : CalledGlobals) {
auto Instruction = CloneContext.mapInstructionStableID(Source.CallInstruction);
if (!Instruction)
return std::unexpected(Instruction.error());
MachineCalledGlobal Destination = Source;
Destination.CallInstruction = *Instruction;
auto AddResult = Result.addCalledGlobal(std::move(Destination));
if (!AddResult)
return std::unexpected(AddResult.error());
}
for (const MachinePrefetchTarget Source : PrefetchTargets) {
auto AddResult = Result.addPrefetchTarget(Source);
if (!AddResult)
return std::unexpected(AddResult.error());
}
return Result;
}
} // namespace rcc
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