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#pragma once
#include "cps/CABI.h"
#include "cps/Identifier.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#include "cps/FunctionAST.h"
#include "cps/TypeSystem.h"
#include <cstdint>
#include <deque>
#include <map>
#include <utility>
#include <vector>
#include <functional>
#include <string>
namespace cps {
class ExceptionHandler;
// Array-parameter ABI: each rank-R array parameter is flattened into the
// data pointer followed by kBoundArgsPerDim i64 bounds per dimension.
inline constexpr unsigned kBoundArgsPerDim = 2; // lower, upper
inline constexpr const char *kLowerBoundSuffix = ".lb";
inline constexpr const char *kUpperBoundSuffix = ".ub";
// Pseudocode-level signature of one FUNCTION/PROCEDURE parameter; for arrays
// TypeName is the ELEMENT type and DeclaredBounds mirrors ParamDecl.
struct ParamSig {
std::string TypeName;
bool IsByRef = false;
bool IsArray = false;
int Rank = 0;
std::vector<std::pair<int64_t, int64_t>> DeclaredBounds;
};
// Pseudocode-level signature of a FUNCTION/PROCEDURE, kept so call sites can
// dispatch on declared parameter types and modes instead of inferring them
// back from LLVM types.
struct FuncSig {
std::string Name;
std::string LinkName;
std::string ParamKey;
bool IsOverload = false;
const PrototypeAST *Prototype = nullptr;
std::string ReturnTypeName;
std::vector<ParamSig> Params;
size_t OwnerUnit = 0;
// EXTERN "C": called through its declared C type, which may differ from a
// runtime declaration of the same libc symbol. ExternABI is clang's
// arrangement of the fixed parameters; ExternType and ExternAttrs lower it.
bool IsExternal = false;
bool IsVariadic = false;
CABISignature ExternABI;
llvm::FunctionType *ExternType = nullptr;
llvm::AttributeList ExternAttrs;
};
class FunctionGen {
public:
// Injected by CodeGen (StmtEmitter inversion precedent) so array
// parameters can be bound into ArrayHandler without FunctionGen ever
// seeing it: (param, incoming data ptr, per-dim lower/upper bounds).
using ArrayParamBinder =
std::function<void(const ParamDecl &, llvm::Value *,
const std::vector<llvm::Value*> &,
const std::vector<llvm::Value*> &)>;
private:
llvm::LLVMContext &Context;
llvm::Module &Module;
llvm::IRBuilder<> &Builder;
TypeSystem &Types;
ExceptionHandler &Exceptions;
IdentifierMap<SymbolInfo> &Symbols;
bool &HadError;
int &DiagnosticLine;
__attribute__((format(printf, 2, 3))) void reportError(const char *Fmt, ...);
IdentifierMap<std::deque<FuncSig>> Signatures;
IdentifierMap<std::pair<std::string, size_t>> LinkIndex;
std::map<const PrototypeAST *, std::string> PrototypeLinks;
std::map<size_t, std::string> UnitPaths;
size_t CurrentUnit = 0;
std::function<bool(size_t)> Visible;
std::function<void(const FuncSig &)> BeforeCall;
ArrayParamBinder BindArrayParam;
std::function<void(llvm::Value *, const std::string &, int)> RegisterCopy;
ClangABI ABI{Context, Types}; // clang context created on the first EXTERN
void createArgumentAllocas(llvm::Function *F, const std::vector<ParamDecl> &Params, bool IsMethod);
llvm::Type *getLLVMType(const std::string &TypeName);
bool validatePrototype(PrototypeAST *Proto);
llvm::Value *emitCall(const std::string &Callee, const std::vector<llvm::Value*> &Args);
public:
FunctionGen(llvm::LLVMContext &C,
llvm::Module &M,
llvm::IRBuilder<> &B,
TypeSystem &TS,
ExceptionHandler &EH,
IdentifierMap<SymbolInfo> &Sym,
bool &HadErrorFlag, int &Line)
: Context(C), Module(M), Builder(B), Types(TS), Exceptions(EH), Symbols(Sym), HadError(HadErrorFlag), DiagnosticLine(Line) {}
void setArrayParamBinder(ArrayParamBinder Binder) { BindArrayParam = std::move(Binder); }
void setCopyRegistrar(std::function<void(llvm::Value *, const std::string &, int)> Registrar) {
RegisterCopy = std::move(Registrar);
}
void setCurrentUnit(size_t Unit, const std::string &Path) { CurrentUnit = Unit; UnitPaths[Unit] = Path; }
void setCallHook(std::function<void(const FuncSig &)> Hook) { BeforeCall = std::move(Hook); }
void setVisibility(std::function<bool(size_t)> Predicate) { Visible = std::move(Predicate); }
std::vector<const FuncSig *> getOverloads(const std::string &Name, bool AllUnits = false) const;
static bool isReservedRuntimeName(const std::string &Name);
bool hasFunction(const std::string &Name) const { return !getOverloads(Name).empty(); }
const FuncSig *getSignatureByLink(const std::string &Name) const;
llvm::Function *emitPrototype(PrototypeAST *Proto);
bool emitExternPrototype(PrototypeAST *Proto);
llvm::Function *emitFunctionDef(FunctionDefAST *FuncAST, const std::function<void(StmtAST*)> &StmtEmitter, unsigned ScopeID);
// Variadic holds the promoted types of an EXTERN call's variadic arguments.
llvm::Value *emitCall(const FuncSig &Sig, const std::vector<llvm::Value*> &Args,
const std::vector<const TypeInfo *> &Variadic = {});
void emitReturn(llvm::Value *RetVal);
};
}
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