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#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/LLVMContext.h>
#include <llvm/IR/Module.h>
#include <llvm/IR/Verifier.h>
#include <llvm/IR/Intrinsics.h>
#include <llvm/Support/raw_ostream.h>
#include <vector>
#include <map>
#include <iostream>
#include <memory>
#include "../../include/backend_llvm.h"
#include "../../include/object.h"
// Do NOT use 'using namespace llvm;' due to clash with our 'Value' type.
class LLVMEmitter {
std::unique_ptr<llvm::LLVMContext> Context;
std::unique_ptr<llvm::Module> ModuleOb;
std::unique_ptr<llvm::IRBuilder<>> Builder;
std::map<IRBasicBlock*, llvm::BasicBlock*> blockMap;
std::vector<llvm::Value*> ssaValues;
public:
LLVMEmitter() {
Context = std::make_unique<llvm::LLVMContext>();
ModuleOb = std::make_unique<llvm::Module>("ProXPL Module", *Context);
Builder = std::make_unique<llvm::IRBuilder<>>(*Context);
setupRuntimeTypes();
setupCoroIntrinsics();
}
void setupCoroIntrinsics() {
// i8* @llvm.coro.begin(token, i8*)
llvm::FunctionType *CoroBeginType = llvm::FunctionType::get(
Builder->getPtrTy(),
{llvm::Type::getTokenTy(*Context), Builder->getPtrTy()},
false
);
llvm::Function::Create(CoroBeginType, llvm::Function::ExternalLinkage, "llvm.coro.begin", ModuleOb.get());
// token @llvm.coro.id(i32, i8*, i8*, i8*)
llvm::FunctionType *CoroIdType = llvm::FunctionType::get(
llvm::Type::getTokenTy(*Context),
{Builder->getInt32Ty(), Builder->getPtrTy(), Builder->getPtrTy(), Builder->getPtrTy()},
false
);
llvm::Function::Create(CoroIdType, llvm::Function::ExternalLinkage, "llvm.coro.id", ModuleOb.get());
// i32 @llvm.coro.size.i64()
llvm::FunctionType *CoroSizeType = llvm::FunctionType::get(
Builder->getInt64Ty(),
{},
false
);
llvm::Function::Create(CoroSizeType, llvm::Function::ExternalLinkage, "llvm.coro.size.i64", ModuleOb.get());
// i8 @llvm.coro.suspend(token, i1)
llvm::FunctionType *CoroSuspendType = llvm::FunctionType::get(
Builder->getInt8Ty(),
{llvm::Type::getTokenTy(*Context), Builder->getInt1Ty()},
false
);
llvm::Function::Create(CoroSuspendType, llvm::Function::ExternalLinkage, "llvm.coro.suspend", ModuleOb.get());
// i1 @llvm.coro.end(i8*, i1)
llvm::FunctionType *CoroEndType = llvm::FunctionType::get(
Builder->getInt1Ty(),
{Builder->getPtrTy(), Builder->getInt1Ty()},
false
);
llvm::Function::Create(CoroEndType, llvm::Function::ExternalLinkage, "llvm.coro.end", ModuleOb.get());
// i8* @llvm.coro.free(token, i8*)
llvm::FunctionType *CoroFreeType = llvm::FunctionType::get(
Builder->getPtrTy(),
{llvm::Type::getTokenTy(*Context), Builder->getPtrTy()},
false
);
llvm::Function::Create(CoroFreeType, llvm::Function::ExternalLinkage, "llvm.coro.free", ModuleOb.get());
// Runtime helper: ObjTask* prox_rt_new_task(void* hdl)
llvm::FunctionType *NewTaskType = llvm::FunctionType::get(
Builder->getInt64Ty(), // Value (ObjTask* encoded)
{Builder->getPtrTy(), Builder->getPtrTy()},
false
);
llvm::Function::Create(NewTaskType, llvm::Function::ExternalLinkage, "prox_rt_new_task", ModuleOb.get());
}
void setupRuntimeTypes() {
// Value prox_rt_add(Value a, Value b);
llvm::FunctionType *BinOpType = llvm::FunctionType::get(
Builder->getInt64Ty(),
{Builder->getInt64Ty(), Builder->getInt64Ty()},
false
);
llvm::Function::Create(BinOpType, llvm::Function::ExternalLinkage, "prox_rt_add", ModuleOb.get());
// void prox_rt_print(Value v);
llvm::FunctionType *PrintType = llvm::FunctionType::get(
Builder->getVoidTy(),
{Builder->getInt64Ty()},
false
);
llvm::Function::Create(PrintType, llvm::Function::ExternalLinkage, "prox_rt_print", ModuleOb.get());
// Value prox_rt_const_string(char* chars, int length);
llvm::FunctionType *ConstStrType = llvm::FunctionType::get(
Builder->getInt64Ty(),
{Builder->getPtrTy(), Builder->getInt32Ty()},
false
);
llvm::Function::Create(ConstStrType, llvm::Function::ExternalLinkage, "prox_rt_const_string", ModuleOb.get());
}
void emitModule(IRModule* module) {
for (int i = 0; i < module->funcCount; i++) {
emitFunction(module->functions[i]);
}
ModuleOb->print(llvm::outs(), nullptr);
}
void emitFunction(IRFunction* func) {
// All functions return Value (Int64)
llvm::FunctionType *FT = llvm::FunctionType::get(Builder->getInt64Ty(), std::vector<llvm::Type*>(), false);
llvm::Function *F = llvm::Function::Create(FT, llvm::Function::ExternalLinkage, func->name, ModuleOb.get());
ssaValues.clear();
ssaValues.resize(func->nextSsaVal + 2048, nullptr);
blockMap.clear();
// Pass 1: Create all blocks
for (int i = 0; i < func->blockCount; i++) {
char name[64];
snprintf(name, sizeof(name), "block%d", func->blocks[i]->id);
blockMap[func->blocks[i]] = llvm::BasicBlock::Create(*Context, name, F);
}
// Async Setup
llvm::Value* CoroId = nullptr;
llvm::Value* CoroHdl = nullptr;
if (func->isAsync) {
llvm::BasicBlock* EntryBB = &F->getEntryBlock();
Builder->SetInsertPoint(EntryBB);
llvm::Function* FCoroId = ModuleOb->getFunction("llvm.coro.id");
llvm::Function* FCoroSize = ModuleOb->getFunction("llvm.coro.size.i64");
llvm::Function* FCoroBegin = ModuleOb->getFunction("llvm.coro.begin");
// %id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
CoroId = Builder->CreateCall(FCoroId, {
Builder->getInt32(0),
llvm::ConstantPointerNull::get(Builder->getPtrTy()),
llvm::ConstantPointerNull::get(Builder->getPtrTy()),
llvm::ConstantPointerNull::get(Builder->getPtrTy())
}, "coro.id");
// %size = call i32 @llvm.coro.size.i64()
llvm::Value* Size = Builder->CreateCall(FCoroSize, {}, "coro.size");
// %alloc = call i8* @malloc(i64 %size) -- we need malloc. Use system malloc or our GC alloc?
// Simplest: just use malloc for now or standard alloc.
// We can use a dummy alloc for now or just rely on elision if optimization is on.
// But for -O0 we need an allocator.
// Let's declare malloc.
llvm::Function* Malloc = ModuleOb->getFunction("malloc");
if (!Malloc) {
llvm::FunctionType* MallocType = llvm::FunctionType::get(Builder->getPtrTy(), {Builder->getInt64Ty()}, false);
Malloc = llvm::Function::Create(MallocType, llvm::Function::ExternalLinkage, "malloc", ModuleOb.get());
}
llvm::Value* Alloc = Builder->CreateCall(Malloc, {Size}, "coro.alloc");
// %hdl = call i8* @llvm.coro.begin(token %id, i8* %alloc)
CoroHdl = Builder->CreateCall(FCoroBegin, {CoroId, Alloc}, "coro.hdl");
// Create a Task object to return initially
llvm::Function* NewTask = ModuleOb->getFunction("prox_rt_new_task");
llvm::Function* ResumeFn = ModuleOb->getFunction("prox_rt_resume");
// ResumeFn should exist since setupSchedulerHelpers called before emitModule
llvm::Value* TaskObj = Builder->CreateCall(NewTask, {CoroHdl, ResumeFn}, "taskObj");
// We need to return this TaskObj properly when function 'starts' (suspends at init).
// But LLVM coroutines split functions. We need to handle `IR_OP_RETURN` specially too.
// Actually, the initial return happens after the first suspend point if we want to return the handle.
// Standard practice: Suspend immediately at start?
// Or rely on implicit behavior.
// Let's implement manual initial suspend point if needed, or just let 'await' trigger it.
// Wait, for `async func`, the caller expects a `Task` back immediately.
// So we MUST suspend at entry to return the Task.
llvm::Function* FCoroSuspend = ModuleOb->getFunction("llvm.coro.suspend");
// suspend(token, final=false)
llvm::Value* SuspendResult = Builder->CreateCall(FCoroSuspend, {
llvm::ConstantTokenNone::get(*Context),
Builder->getInt1(0)
});
// Switch on suspend result:
// 0: Resume (fallthrough to function body)
// 1: Cleanup (goto cleanup)
// 2: Suspend (return TaskObj)
llvm::BasicBlock* ResumeBB = llvm::BasicBlock::Create(*Context, "coro.resume", F);
llvm::BasicBlock* CleanupBB = llvm::BasicBlock::Create(*Context, "coro.cleanup", F);
llvm::BasicBlock* SuspendBB = llvm::BasicBlock::Create(*Context, "coro.suspend", F);
llvm::SwitchInst* SI = Builder->CreateSwitch(SuspendResult, SuspendBB, 2);
SI->addCase(Builder->getInt8(0), ResumeBB);
SI->addCase(Builder->getInt8(1), CleanupBB);
// Suspend Path: Return TaskObj
Builder->SetInsertPoint(SuspendBB);
Builder->CreateRet(TaskObj);
// Cleanup Path: Free memory
Builder->SetInsertPoint(CleanupBB);
llvm::Function* FCoroFree = ModuleOb->getFunction("llvm.coro.free");
llvm::Value* MemToFree = Builder->CreateCall(FCoroFree, {CoroId, CoroHdl});
llvm::Function* Free = ModuleOb->getFunction("free");
if (!Free) {
llvm::FunctionType* FreeType = llvm::FunctionType::get(Builder->getVoidTy(), {Builder->getPtrTy()}, false);
Free = llvm::Function::Create(FreeType, llvm::Function::ExternalLinkage, "free", ModuleOb.get());
}
Builder->CreateCall(Free, {MemToFree});
// Return NIL/Undef (caller shouldn't see this)
Builder->CreateRet(llvm::ConstantInt::get(*Context, llvm::APInt(64, 0x7ffc000000000001, false))); // NIL
// Resume Path: Actual function body
// Remap entry block to ResumeBB for subsequent instructions?
// Ideally we should have injected this logic BEFORE the first block's instructions.
// But we are in `emitFunction` before iterating blocks.
// The loop below `for (int i=0; ...)` visits blocks.
// We need to jump from ResumeBB to the first logic block.
Builder->SetInsertPoint(ResumeBB);
Builder->CreateBr(blockMap[func->blocks[0]]);
// BUT wait, `blocks[0]` was already mapped to a BasicBlock.
// That block is empty right now (instructions will be added in Pass 2).
// Does `blocks[0]` have predecessors?
// If we jump to it from ResumeBB, it's fine.
}
// Pass 2: Emit instructions (except Phi operands)
for (int i = 0; i < func->blockCount; i++) {
IRBasicBlock* irBlock = func->blocks[i];
llvm::BasicBlock* llvmBlock = blockMap[irBlock];
Builder->SetInsertPoint(llvmBlock);
IRInstruction* instr = irBlock->first;
while (instr) {
emitInstruction(instr, CoroHdl); // Pass coroutine handle if needed
instr = instr->next;
}
}
// Pass 3: Fill in Phi operands
for (int i = 0; i < func->blockCount; i++) {
IRInstruction* instr = func->blocks[i]->first;
while (instr) {
if (instr->opcode == IR_OP_PHI) {
llvm::PHINode* phi = llvm::cast<llvm::PHINode>(ssaValues[instr->result]);
for (int k = 0; k < instr->operandCount; k += 2) {
llvm::Value* val = getOperand(instr->operands[k]);
llvm::BasicBlock* incomingBB = blockMap[instr->operands[k+1].as.block];
if (val && incomingBB) {
phi->addIncoming(val, incomingBB);
}
}
}
instr = instr->next;
}
}
// Generate return 0 if block is unterminated (fallback)
if (!F->back().getTerminator()) {
Builder->SetInsertPoint(&F->back());
if (func->isAsync) {
// For async, falling off end means task complete with NIL
// TODO: Mark task complete in runtime?
// coro.end
llvm::Function* FCoroEnd = ModuleOb->getFunction("llvm.coro.end");
Builder->CreateCall(FCoroEnd, {llvm::ConstantPointerNull::get(Builder->getPtrTy()), Builder->getInt1(0)});
Builder->CreateUnreachable(); // Should not return normally from here in coro structure
} else {
uint64_t nilVal = 0x7ffc000000000001;
Builder->CreateRet(llvm::ConstantInt::get(*Context, llvm::APInt(64, nilVal, false)));
}
}
// Verify function
std::string err;
llvm::raw_string_ostream os(err);
if (llvm::verifyFunction(*F, &os)) {
std::cerr << "LLVM Verification Error in " << func->name << ": " << os.str() << "\n";
// F->dump();
}
}
void emitInstruction(IRInstruction* instr, llvm::Value* CoroHdl = nullptr) {
switch (instr->opcode) {
case IR_OP_CONST: {
llvm::Value* v = nullptr;
if (IS_NUMBER(instr->operands[0].as.constant)) {
// Just a double encoded as int64
double num = AS_NUMBER(instr->operands[0].as.constant);
uint64_t bits;
memcpy(&bits, &num, sizeof(double));
v = llvm::ConstantInt::get(*Context, llvm::APInt(64, bits, false));
} else if (IS_STRING(instr->operands[0].as.constant)) {
// Define global string constant
ObjString* strObj = AS_STRING(instr->operands[0].as.constant);
llvm::Constant *StrConstant = llvm::ConstantDataArray::getString(*Context, strObj->chars);
llvm::GlobalVariable *ValidStr = new llvm::GlobalVariable(*ModuleOb, StrConstant->getType(), true,
llvm::GlobalValue::PrivateLinkage, StrConstant, ".str");
// Call runtime to create ObjString
llvm::Function *AllocFunc = ModuleOb->getFunction("prox_rt_const_string");
llvm::Value* Zero = Builder->getInt32(0);
llvm::Value* Args[] = { Zero, Zero };
// GEP to get pointer to char array
llvm::Value* StrPtr = Builder->CreateInBoundsGEP(StrConstant->getType(), ValidStr, Args);
v = Builder->CreateCall(AllocFunc, {
StrPtr,
Builder->getInt32(strObj->length)
}, "strObj");
}
ssaValues[instr->result] = v;
break;
}
case IR_OP_ADD: {
llvm::Value* L = getOperand(instr->operands[0]);
llvm::Value* R = getOperand(instr->operands[1]);
llvm::Function *AddFunc = ModuleOb->get
7440
Function("prox_rt_add");
// if (L && R && AddFunc)
ssaValues[instr->result] = Builder->CreateCall(AddFunc, {L, R}, "addtmp");
break;
}
case IR_OP_AWAIT: {
llvm::Value* TaskToAwait = getOperand(instr->operands[0]);
if (!CoroHdl) {
// Sync await (e.g. in main)
// Call prox_rt_run_and_wait(TaskToAwait)
llvm::Function* FRunWait = ModuleOb->getFunction("prox_rt_run_and_wait");
if (FRunWait) {
ssaValues[instr->result] = Builder->CreateCall(FRunWait, {TaskToAwait}, "await_res");
}
return;
}
// We need to:
// 1. Check if task is done? (Runtime optimization)
// 2. If not, suspend.
// 3. Register callback or put in scheduler?
// For simplicity: Always suspend, let scheduler check status.
// Call runtime to register await: prox_rt_await(CoroHdl, TaskToAwait)
// BUT we don't have prox_rt_await declared yet.
// And await should return the result of the task.
// Call runtime to register await
llvm::Function* FAwait = ModuleOb->getFunction("prox_rt_await");
if (FAwait) {
Builder->CreateCall(FAwait, {TaskToAwait});
}
// For now, emit llvm.coro.suspend.
llvm::Function* FCoroSuspend = ModuleOb->getFunction("llvm.coro.suspend");
llvm::Value* SuspendResult = Builder->CreateCall(FCoroSuspend, {
llvm::ConstantTokenNone::get(*Context),
Builder->getInt1(0)
});
llvm::BasicBlock* ResumeBB = llvm::BasicBlock::Create(*Context, "await.resume", Builder->GetInsertBlock()->getParent());
llvm::BasicBlock* CleanupBB = llvm::BasicBlock::Create(*Context, "await.cleanup", Builder->GetInsertBlock()->getParent());
llvm::BasicBlock* SuspendBB = llvm::BasicBlock::Create(*Context, "await.suspend", Builder->GetInsertBlock()->getParent());
llvm::SwitchInst* SI = Builder->CreateSwitch(SuspendResult, SuspendBB, 2);
SI->addCase(Builder->getInt8(0), ResumeBB);
SI->addCase(Builder->getInt8(1), CleanupBB);
// Suspend: Return (back to scheduler)
Builder->SetInsertPoint(SuspendBB);
// What to return? For await, we don't return a new task, we just yield control.
// We should return something to the caller (scheduler).
// Usually void or boolean.
// But our function signature returns Value (Int64).
// Return NIL/Placeholder.
Builder->CreateRet(llvm::ConstantInt::get(*Context, llvm::APInt(64, 0x7ffc000000000001, false))); // NIL
// Cleanup
Builder->SetInsertPoint(CleanupBB);
// ... free ...
llvm::Function* FCoroFree = ModuleOb->getFunction("llvm.coro.free");
(void)FCoroFree;
// We need ID for free... complex to propagate ID everywhere.
// For skeleton, trap.
Builder->CreateUnreachable();
// Resume
Builder->SetInsertPoint(ResumeBB);
// Return value of await?
// Assume runtime put result in a special slot or registers?
// For now, return TaskToAwait (dummy result) or NIL.
ssaValues[instr->result] = TaskToAwait;
break;
}
case IR_OP_JUMP: {
Builder->CreateBr(blockMap[instr->operands[0].as.block]);
break;
}
case IR_OP_JUMP_IF: {
llvm::Value* Cond = getOperand(instr->operands[0]);
llvm::BasicBlock* Then = blockMap[instr->operands[1].as.block];
llvm::BasicBlock* Else = blockMap[instr->operands[2].as.block];
// Temporary: Treat 0 as false
if (Cond) {
llvm::Value* boolCond = Builder->CreateICmpNE(Cond, llvm::ConstantInt::get(*Context, llvm::APInt(64, 0)), "ifcond");
Builder->CreateCondBr(boolCond, Then, Else);
}
break;
}
case IR_OP_PHI: {
ssaValues[instr->result] = Builder->CreatePHI(Builder->getInt64Ty(), instr->operandCount / 2, "phitmp");
break;
}
case IR_OP_RETURN: {
llvm::Value* V = getOperand(instr->operands[0]);
if (!V) {
uint64_t nilVal = 0x7ffc000000000001;
V = llvm::ConstantInt::get(*Context, llvm::APInt(64, nilVal, false));
}
if (CoroHdl) {
// Async return: Mark task as complete with value V
// prox_rt_resolve_task(CurrentTask, V) ??
// For now, just end.
llvm::Function* FCoroEnd = ModuleOb->getFunction("llvm.coro.end");
Builder->CreateCall(FCoroEnd, {llvm::ConstantPointerNull::get(Builder->getPtrTy()), Builder->getInt1(0)});
Builder->CreateUnreachable();
} else {
Builder->CreateRet(V);
}
break;
}
default:
break;
}
}
void setupSchedulerHelpers() {
// void prox_rt_resume(i8* hdl)
llvm::FunctionType *ResumeType = llvm::FunctionType::get(
Builder->getVoidTy(),
{Builder->getPtrTy()},
false
);
llvm::Function* FResume = llvm::Function::Create(ResumeType, llvm::Function::ExternalLinkage, "prox_rt_resume", ModuleOb.get());
// Implement prox_rt_resume wrapper
llvm::BasicBlock* Entry = llvm::BasicBlock::Create(*Context, "entry", FResume);
llvm::IRBuilder<> ResBuilder(Entry);
// Declare llvm.coro.resume manually instead of Intrinsic::getDeclaration for LLVM 15+ compatibility
llvm::Function* FCoroResume = ModuleOb->getFunction("llvm.coro.resume");
if (!FCoroResume) {
llvm::FunctionType *CoroResumeType = llvm::FunctionType::get(
Builder->getVoidTy(),
{Builder->getPtrTy()},
false
);
FCoroResume = llvm::Function::Create(CoroResumeType, llvm::Function::ExternalLinkage, "llvm.coro.resume", ModuleOb.get());
}
ResBuilder.CreateCall(FCoroResume, {FResume->arg_begin()});
ResBuilder.CreateRetVoid();
// void prox_rt_await(Value task)
llvm::FunctionType *AwaitType = llvm::FunctionType::get(
Builder->getVoidTy(),
{Builder->getInt64Ty()},
false
);
llvm::Function::Create(AwaitType, llvm::Function::ExternalLinkage, "prox_rt_await", ModuleOb.get());
// Value prox_rt_run_and_wait(Value task)
llvm::FunctionType *RunWaitType = llvm::FunctionType::get(
Builder->getInt64Ty(),
{Builder->getInt64Ty()},
false
);
llvm::Function::Create(RunWaitType, llvm::Function::ExternalLinkage, "prox_rt_run_and_wait", ModuleOb.get());
}
// Call this from setupRuntimeTypes or Constructor
llvm::Value* getOperand(IROperand& op) {
if (op.type == OPERAND_CONST) {
if (IS_NUMBER(op.as.constant)) {
// Return int64 representation of double
double num = AS_NUMBER(op.as.constant);
uint64_t bits;
memcpy(&bits, &num, sizeof(double));
return llvm::ConstantInt::get(*Context, llvm::APInt(64, bits, false));
}
// Other constants?
return nullptr;
} else if (op.type == OPERAND_VAL) {
if (op.as.ssaVal >= 0 && (size_t)op.as.ssaVal < ssaValues.size()) {
return ssaValues[op.as.ssaVal];
}
}
return nullptr;
}
};
extern "C" void emitLLVM(IRModule* module) {
LLVMEmitter emitter;
emitter.setupSchedulerHelpers(); // Add helpers
emitter.emitModule(module);
}