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ILEmitter.n
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ILEmitter.n
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/*
* Copyright (c) 2003-2008 The University of Wroclaw.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the University may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE UNIVERSITY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Nemerle.Compiler
{
using Nemerle.Collections;
using Nemerle.Surround;
using Nemerle.Utility;
using System;
using System.IO;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
using System.Diagnostics.SymbolStore;
using Nemerle.Compiler.Typedtree;
using Nemerle.Logging;
using NC = Nemerle.Compiler;
[assembly: LogFlag (EMIT, 0)]
[assembly: DefineSurround("inScope", false, _ilg.BeginScope(), _ilg.EndScope())]
/* ----------------------------------------------------------------------- */
/* -- CODE GENERATOR CLASS ----------------------------------------------- */
/* ----------------------------------------------------------------------- */
/**
* Generates the IL code for a method or a constructor
*/
[ManagerAccess]
class ILEmitter
{
private _module_builder : ModuleBuilder;
private _ilg : NemerleGenerator;
private _parent_type_builder : NC.TypeBuilder;
private _this_is_value_type : bool;
private _type_of_this : System.Type;
private _method_name : string;
private _method_builder : NC.MethodBuilder;
private mutable _method_start_label : Label;
private mutable _debug_doc : ISymbolDocumentWriter;
private mutable _is_ctor : bool;
private mutable _is_lambda : bool;
private _labels : Hashtable [int, Label] = Hashtable ();
private _label_usage : Hashtable [int, TExpr] = Hashtable ();
static MS_NET_RUNTIME_TYPE : System.Type = typeof (object).Assembly.GetType ("System.RuntimeType");
static MONO_RUNTIME_TYPE : System.Type = typeof (object).Assembly.GetType ("System.MonoType");
static RUNTIME_TYPE : System.Type = MS_NET_RUNTIME_TYPE ?? MONO_RUNTIME_TYPE;
/**
* Creates and executes a code generator for a method
*/
internal this (method_builder : NC.MethodBuilder)
{
Manager = method_builder.Manager;
_method_builder = method_builder;
def mbase = _method_builder.GetMethodBase ();
_ilg = Late.late_macro (NemerleGenerator (mbase.GetILGenerator () :> ILGenerator));
_module_builder = mbase.Module :> ModuleBuilder;
_parent_type_builder = _method_builder.DeclaringType;
_method_name = mbase.DeclaringType.TypeFullName () + "::" + mbase.Name;
_this_is_value_type = _parent_type_builder.IsValueType;
_type_of_this = _parent_type_builder.GetMemType ().GetSystemType ();
}
public Run () : void
{
_ilg.SetDocument (_debug_doc);
_method_start_label = _ilg.DefineLabel ();
_ilg.MarkLabel (_method_start_label);
match (_method_builder.GetHeader ().body) {
| FunBody.Typed (body) =>
_is_ctor = is_ctor(_method_builder);
_is_lambda = _method_builder.DeclaringType.is_lambda;
surroundwith(inScope)
{
emit (body);
if (body.Throws)
{
//method end is unreachable, but fall through end of method can be
//detected by the runtime, fix it (bug #1091)
def l = _ilg.DefineLabel ();
_ilg.MarkLabel (l);
_ilg.Emit (OpCodes.Br, l);
}
else _ilg.Emit (OpCodes.Ret);
}
// let GC take it
_method_builder.GetHeader ().body = FunBody.ILed ();
| _ => Util.ice ($"method $_method_name is already ILed")
}
_label_usage.Iter (fun (id, v : TExpr)
{
// shouldn't happen now
when (v != null)
{
assert2(false);
Message.Error (v.Location, $"non local goto (block return?) detected (l$id)");
}
})
}
private static is_always_true (expr : TExpr) : bool
{
| Literal (Literal.Bool (true)) => true
| If (cond_expr, then_expr, else_expr, _, _) =>
def cond_always_true = is_always_true (cond_expr);
def cond_always_false = is_always_false (cond_expr);
def then_always_true = is_always_true (then_expr);
def else_always_true = is_always_true (else_expr);
cond_always_true && then_always_true ||
cond_always_false && else_always_true
// unsafe, cond can have side effects
// then_always_true && else_always_true
| _ => false
}
[Nemerle.Memoize(Scope=Instance, Synchronized=true)]
private DefineDebugDocument (fileIndex : int) : ISymbolDocumentWriter
{
if (fileIndex != 0) // not Location.Default
_module_builder.DefineDocument (Path.GetFullPath (Location.GetFileName(fileIndex)),
SymDocumentType.Text, SymLanguageType.ILAssembly, SymLanguageVendor.Microsoft);
else {
Message.Warning ("missing debug location, this is probably some internal compiler error");
def loc = LocationStack.Top();
if (loc != Location.Default)
DefineDebugDocument (loc.FileIndex);
else
_debug_doc;
}
}
public SetDocument (loc : Location) : void
{
_debug_doc = DefineDebugDocument(loc.FileIndex);
}
private static is_always_false (expr : TExpr) : bool
{
| Literal (Bool (false)) => true
| If (cond_expr, then_expr, else_expr, _, _) =>
def cond_always_true = is_always_true (cond_expr);
def cond_always_false = is_always_false (cond_expr);
def then_always_false = is_always_false (then_expr);
def else_always_false = is_always_false (else_expr);
cond_always_true && then_always_false ||
cond_always_false && else_always_false
// unsafe, cond can have side effects
// then_always_false && else_always_false
| _ => false
}
IsDebugEnabled : bool { get { _debug_doc != null } }
/** Emit volatile prefix if needed. */
private maybe_volatile (expr : TExpr) : void
{
| StaticRef (_, f is IField, _)
| FieldMember (_, f) =>
when (f.IsVolatile)
_ilg.Emit (OpCodes.Volatile)
| _ => ()
}
/** Box the value of type [t] if needed. */
need_reference (t : System.Type) : void
{
when (t.IsValueType || t.IsGenericParameter)
_ilg.Emit (OpCodes.Box, t);
}
is_void (ty : TypeVar) : bool
{
ty.Fix () : object == InternalType.Void
}
static is_ctor (meth : IMethod) : bool
{
meth.MemberKind == MemberKinds.Constructor
}
#region HACKS FOR MS.NET BUGS
static GetHackishConstructor (_from_type : System.Type, ctr : ConstructorInfo) : ConstructorInfo
{
def curtok = match(ctr) {
| ctr is ConstructorBuilder => ctr.GetToken().Token
| _ => ctr.MetadataToken;
}
res: {
foreach (c in _from_type.GetConstructors (BindingFlags.NonPublic | BindingFlags.Public |
BindingFlags.Instance | BindingFlags.Static |
BindingFlags.DeclaredOnly))
when (c.MetadataToken == curtok)
res (c);
throw System.Exception ($"not found: $ctr in $_from_type")
}
}
static GetHackishMethod (_from_type : System.Type, meth : MethodInfo) : MethodInfo
{
def curtok = match(meth) {
| meth is Emit.MethodBuilder => meth.GetToken().Token
| _ => meth.MetadataToken;
}
res: {
foreach (m in _from_type.GetMethods (BindingFlags.NonPublic | BindingFlags.Public |
BindingFlags.Instance | BindingFlags.Static |
BindingFlags.DeclaredOnly))
when (m.MetadataToken == curtok)
res (m);
throw System.Exception ($"not found: $meth in $_from_type")
}
}
static GetHackishField (_from_type : System.Type, fld : FieldInfo) : FieldInfo
{
def curtok = match(fld) {
| fld is Emit.FieldBuilder => fld.GetToken().Token
| _ => fld.MetadataToken;
}
res: {
foreach (f in _from_type.GetFields (BindingFlags.NonPublic | BindingFlags.Public |
BindingFlags.Instance | BindingFlags.Static |
BindingFlags.DeclaredOnly))
when (f.MetadataToken == curtok)
res (f);
throw System.Exception ($"not found: $fld in $_from_type")
}
}
#endregion
static FrameworkGetConstructor (t : System.Type, mutable m : ConstructorInfo) : ConstructorInfo
{
if (RUNTIME_TYPE != null)
if(t.GetType().Equals (RUNTIME_TYPE))
GetHackishConstructor (t, m)
else {
def td = t.GetGenericTypeDefinition ();
when (td.GetType().Equals (RUNTIME_TYPE))
m = GetHackishConstructor (td, m);
TypeBuilder.GetConstructor (t, m)
}
else
TypeBuilder.GetConstructor (t, m)
}
static FrameworkGetMethod (t : System.Type, mutable m : MethodInfo) : MethodInfo
{
// workaround MS.NET and Mono limitation of not allowing RuntimeType in TypeBuilder.GetMethod
if (RUNTIME_TYPE != null)
if (t.GetType().Equals (RUNTIME_TYPE))
GetHackishMethod (t, m)
else {
def td = t.GetGenericTypeDefinition ();
when (td.GetType().Equals (RUNTIME_TYPE))
m = GetHackishMethod (td, m);
TypeBuilder.GetMethod (t, m)
}
else
TypeBuilder.GetMethod (t, m)
}
static FrameworkGetField (t : System.Type, mutable m : FieldInfo) : FieldInfo
{
// use hack only on .NET
if (MS_NET_RUNTIME_TYPE != null)
if(t.GetType().Equals (MS_NET_RUNTIME_TYPE))
GetHackishField (t, m);
else {
def td = t.GetGenericTypeDefinition ();
when (td.GetType().Equals (MS_NET_RUNTIME_TYPE))
m = GetHackishField (td, m);
TypeBuilder.GetField (t, m)
}
else
TypeBuilder.GetField (t, m)
}
static GetConstructorInfo (_from_type : System.Type, meth : IMethod) : ConstructorInfo
{
mutable ctr_inf = meth.GetConstructorInfo ();
when (_from_type.IsGenericType) {
ctr_inf = FrameworkGetConstructor (_from_type, ctr_inf);
}
ctr_inf
}
// FIXME: get rid of this
internal static GetMethodInfo (_from_type : FixedType, meth : IMethod) : MethodInfo
{
mutable meth_inf = meth.GetMethodInfo ();
//Message.Debug ($"gmi: $_from_type $meth $(meth.GetHeader ().typarms)");
//Message.Debug ($"gmi mi: $meth_inf");
def _from_type = _from_type.Fix ().GetInstantiatedSuperType (meth.DeclaringType).GetSystemType ();
when (_from_type.IsGenericType) {
meth_inf = FrameworkGetMethod (_from_type, meth_inf);
}
//Message.Debug ($"gmi mi2: $meth_inf");
meth_inf
}
static GetMethodInfo (from_type : TypeVar, meth : IMethod, typars : list [TypeVar]) : MethodInfo
{
mutable meth_inf = meth.GetMethodInfo ();
//Message.Debug ($"gmi: $from_type $meth $(meth.GetHeader ().typarms) $typars");
//Message.Debug ($"gmi mi: $meth_inf");
def from_type = from_type.Fix ().GetInstantiatedSuperType (meth.DeclaringType);
def system_from_type = from_type.GetSystemType ();
when (system_from_type.IsGenericType)
meth_inf = FrameworkGetMethod (system_from_type, meth_inf);
//Message.Debug ($"gmi mi2: $meth_inf");
def m_typarms = meth.GetHeader().TypeParameters;
unless (m_typarms.IsEmpty)
{
def pars = typars.MapToArray(x => x.GetNonVoidSystemType());
def errorCount = Message.ErrorCount;
NList.Iter2 (m_typarms, typars, _.CheckConstraints (_, meth));
when (errorCount == Message.ErrorCount)
meth_inf = meth_inf.MakeGenericMethod (pars);
// Message.Debug ($"res gmi: $meth_inf");
}
meth_inf
}
static GetFieldInfo (_obj : TExpr, fld : IField) : FieldInfo
{
def obj_type = _obj.FixedType().GetInstantiatedSuperType (fld.DeclaringType).GetSystemType ();
GetFieldInfo (obj_type, fld);
}
static GetFieldInfo (_from_type : System.Type, meth : IField) : FieldInfo
{
mutable fld_inf = meth.GetFieldInfo ();
when (_from_type.IsGenericType)
fld_inf = FrameworkGetField (_from_type, fld_inf);
fld_inf
}
store_local (decl : LocalValue) : void
{
if (decl.IsParm) {
Util.cassert (! decl.IsByRefParm);
store_argument (decl.ParmIndex)
} else
// simply skip assignment here
unless (is_void (decl.Type))
_ilg.Emit (OpCodes.Stloc, decl.LocalSlot);
}
emit_parms (parms : list [Parm]) : void
{
emit_exprs (parms.Map (_.expr));
}
static skipped (expr : TExpr) : void
{
| TExpr.Goto
| TExpr.Literal (Literal.Void)
| TExpr.Label (_, Literal (Void))
| TExpr.DebugInfo (Literal (Void), null)
| TExpr.DebugInfo (null, _) => ()
| _ =>
Message.Warning (expr.Location,
"this expression has been skipped in code "
"generation because of unreachable code");
//Message.Warning (expr.loc, expr.ToString ());
}
static no_cast_needed (src_type : System.Type, target_type : System.Type) : bool
{
src_type : object == target_type
}
static make_ref_type (t : System.Type) : System.Type
{
t.MakeByRefType ()
}
private emit_tuple_function_conversion (after : FixedType, member_from : FixedType, member : IMember) : void
{
def interesting_part (t) {
if (member is IMethod)
match (t.Fix ()) {
| FixedType.Fun (_, t) => t
| _ => Util.ice ()
}
else t
}
def is_single_arg_function (t) {
match (interesting_part (t).Fix ()) {
| Fun (from, _) => ! (from.Fix () is FixedType.Tuple)
| _ => false
}
}
match (member_from) {
| Class | Array | StaticTypeVarRef =>
match (after) {
| Fun (from, to) =>
match (from.Fix ()) {
| Tuple (parms) =>
// I think there is one more case
// class A[T] { x : T; }
// B[T] : A[T->void]
// C[T] : B[T*T]
// but this is really perverse
when (is_single_arg_function (member.GetMemType ()) ||
is_single_arg_function (member_from.TypeOfMember (member))) {
def ftn = InternalType.GetFunctionType (parms.Length);
def info =
if (to.Fix () is FixedType.Void) {
def mt = FixedType.Class (ftn.FromTupleVoidTyCon, parms);
GetConstructorInfo (mt.GetSystemType (), ftn.FromTupleVoidCtor)
} else {
def mt = FixedType.Class (ftn.FromTupleTyCon, parms + [to]);
GetConstructorInfo (mt.GetSystemType (), ftn.FromTupleCtor)
}
// Message.Warning ($ "using f1->fN conversion");
_ilg.Emit (OpCodes.Newobj, info)
}
| _ => {}
}
| _ => {}
}
| _ => {}
}
}
/// If stack contains 1 it plase and on the contrary
private InversBool() : void
{
_ilg.Emit(OpCodes.Ldc_I4_0); _ilg.Emit(OpCodes.Ceq);
}
/**
* Emits an expression.
*/
private emit (expr : TExpr) : void
{
log (EMIT, $"{ emit: $expr");
Util.cassert (expr != null);
Util.locate (expr.Location,
match (expr)
{
/* -- SEQUENCING --------------------------------------------------- */
/* emits a sequence of expressions */
| Sequence (e1, e2) =>
emit (e1);
if (!e1.Throws || e2.JumpTarget)
emit (e2);
else
skipped (e2);
| DefValIn (_, let_val, body) when let_val.Throws && ! body.JumpTarget =>
emit (let_val);
skipped (body);
/* emits a local value definition */
| DefValIn (decl, let_val, let_in) =>
match (let_val) {
| DefaultValue when !decl.IsMutable =>
unless (is_void (decl.Type))
declare_val_local_slot_ex (decl);
| ImplicitValueTypeCtor =>
def slot = declare_val_local_slot (decl);
_ilg.Emit (OpCodes.Ldloca, slot);
_ilg.Emit (OpCodes.Initobj, let_val.GetSystemType ());
| _ =>
emit (let_val);
unless (is_void (decl.Type)) {
if (!decl.EverUsed) {
_ilg.Emit (OpCodes.Pop);
} else {
def local_slot = declare_val_local_slot(decl);
unless (let_val.Throws)
_ilg.Emit (OpCodes.Stloc, local_slot);
}
}
}
emit (let_in);
/* -- CONDITIONAL CONSTRUCTIONS ------------------------------------ */
/* emits the if/then/else construction */
| If (cond_expr, then_expr, else_expr, then_debug_loc, else_debug_loc) =>
def emit_debug (loc) {
// This code locates the debugger right after the condition gets successful or fails.
// Used to debug match cases.
//
when (IsDebugEnabled && loc.IsSourceAvailable)
emit_debug_info (TExpr.DebugInfo (loc, null, null, null));
}
def emit_branch (expr : TExpr, else_label : Label, debug_loc: Location) {
def emit_br (opcode1, opcode2)
{
if (!IsDebugEnabled || !debug_loc.IsSourceAvailable) {
_ilg.Emit (opcode1, else_label);
} else {
def debug_label = _ilg.DefineLabel ();
_ilg.Emit (opcode2, debug_label);
emit_debug (debug_loc);
_ilg.Emit (OpCodes.Br, else_label);
_ilg.MarkLabel (debug_label);
}
}
match (expr) {
| Call (OpCode ("=="), [nested_cond,
Parm where (expr = TExpr.TypeConversion(TExpr.Literal(Literal.Bool(true)), _, _, _))], _) =>
emit_branch(nested_cond.expr, else_label, Location.Default)
| Call (OpCode (opcode), parms, _) =>
emit_parms (parms);
/* NOTE: the opcodes are swapped so that the 'then' expression
can be emitted before the 'else' expression */
def opcodes =
match (opcode)
{
| "==.ref" | "==" => (OpCodes.Bne_Un, OpCodes.Beq)
| "!=.ref" | "!=" => (OpCodes.Beq, OpCodes.Bne_Un)
| "<.s" | "<.f" => (OpCodes.Bge, OpCodes.Blt)
| "<.u" => (OpCodes.Bge_Un, OpCodes.Blt_Un)
| ">.s" | ">.f" => (OpCodes.Ble, OpCodes.Bgt)
| ">.u" => (OpCodes.Ble_Un, OpCodes.Bgt_Un)
| "<=.s" | "<=.f" => (OpCodes.Bgt, OpCodes.Ble)
| "<=.u" => (OpCodes.Bgt_Un, OpCodes.Ble_Un)
| ">=.s" | ">=.f" => (OpCodes.Blt, OpCodes.Bge)
| ">=.u" => (OpCodes.Blt_Un, OpCodes.Bge_Un)
| "bool.!" => (OpCodes.Brtrue, OpCodes.Brfalse)
| _ => Util.ice ("invalid opcode '" + opcode +
"' in optimized TExpr.If pattern")
};
emit_br (opcodes);
| HasType (val, ty) =>
emit (val);
need_reference (val.GetSystemType ());
_ilg.Emit (OpCodes.Isinst, ty.GetSystemType ());
emit_br (OpCodes.Brfalse, OpCodes.Brtrue);
| If (new_cond, new_then, new_else, _, _) =>
def my_label_else = _ilg.DefineLabel ();
def my_label_fi = _ilg.DefineLabel ();
emit_branch (new_cond, my_label_else, Location.Default);
emit_branch (new_then, else_label, Location.Default);
unless (new_then.Throws)
_ilg.Emit (OpCodes.Br, my_label_fi);
_ilg.MarkLabel (my_label_else);
emit_branch (new_else, else_label, Location.Default);
_ilg.MarkLabel (my_label_fi);
| e when is_always_true (e) => ()
| e when is_always_false (e) =>
_ilg.Emit (OpCodes.Br, else_label);
| _ =>
//Message.Debug (e.loc, pretty_print (e));
// most of other expressions here are TExpr.Ref
emit (expr);
unless (expr.Throws)
emit_br (OpCodes.Brfalse, OpCodes.Brtrue);
}
}
def label_condition_else = _ilg.DefineLabel ();
def label_condition_fi = _ilg.DefineLabel ();
surroundwith(inScope)
{
emit_branch (cond_expr, label_condition_else, else_debug_loc);
surroundwith(inScope)
{
emit_debug (then_debug_loc);
emit (then_expr);
}
unless (then_expr.Throws)
_ilg.Emit (OpCodes.Br, label_condition_fi);
surroundwith(inScope)
{
_ilg.MarkLabel (label_condition_else);
emit (else_expr);
}
_ilg.MarkLabel (label_condition_fi);
}
/* emit a type check construction */
| HasType (expr, ty) =>
emit (expr);
def label_condition_not_null = _ilg.DefineLabel ();
def label_condition_has_type = _ilg.DefineLabel ();
def label_condition_continue = _ilg.DefineLabel ();
_ilg.Emit (OpCodes.Dup);
_ilg.Emit (OpCodes.Brtrue_S, label_condition_not_null);
_ilg.ThrowException (SystemTypeCache.NullMatchException);
_ilg.MarkLabel (label_condition_not_null);
need_reference (expr.GetSystemType ());
_ilg.Emit (OpCodes.Isinst, ty.GetSystemType ());
_ilg.Emit (OpCodes.Brtrue_S, label_condition_has_type);
_ilg.Emit (OpCodes.Ldc_I4_0);
_ilg.Emit (OpCodes.Br_S, label_condition_continue);
_ilg.MarkLabel (label_condition_has_type);
_ilg.Emit (OpCodes.Ldc_I4_1);
_ilg.MarkLabel (label_condition_continue);
| DefaultValue =>
match(expr.GetSystemType ()) {
| _ when is_void(expr.FixedType()) => ()
| ty when ty.Equals (SystemTypeCache.Char)
| ty when ty.Equals (SystemTypeCache.Byte)
| ty when ty.Equals (SystemTypeCache.SByte)
| ty when ty.Equals (SystemTypeCache.Int16)
| ty when ty.Equals (SystemTypeCache.Int32)
| ty when ty.Equals (SystemTypeCache.UInt16)
| ty when ty.Equals (SystemTypeCache.UInt32)
| ty when ty.Equals (SystemTypeCache.Boolean) =>
_ilg.Emit (OpCodes.Ldc_I4_0);
| ty when ty.Equals (SystemTypeCache.Int64)
| ty when ty.Equals (SystemTypeCache.UInt64) =>
_ilg.Emit (OpCodes.Ldc_I4_0);
_ilg.Emit (OpCodes.Conv_I8);
| ty when ty.Equals (SystemTypeCache.Single) =>
_ilg.Emit (OpCodes.Ldc_R4, 0.0f);
| ty when ty.Equals (SystemTypeCache.Double) =>
_ilg.Emit (OpCodes.Ldc_R8, 0.0d);
| ty when ty.Equals (SystemTypeCache.Decimal) =>
_ilg.Emit (OpCodes.Ldc_I4_0);
_ilg.Emit (OpCodes.Newobj, ty.GetConstructor (array [SystemTypeCache.Int32]));
| ty when ty.IsValueType || ty.IsGenericParameter =>
def local_slot = _ilg.DeclareLocal (ty);
_ilg.Emit (OpCodes.Ldloca, local_slot);
_ilg.Emit (OpCodes.Initobj, ty);
_ilg.Emit (OpCodes.Ldloc, local_slot);
| _ => _ilg.Emit (OpCodes.Ldnull);
}
| CtorOf(ty, method) =>
def sysType = ty.GetSystemType();
def ctorInfo = GetConstructorInfo (sysType, method);
_ilg.Emit (OpCodes.Ldtoken, ctorInfo);
_ilg.Emit (OpCodes.Ldtoken, sysType);
_ilg.Emit (OpCodes.Call, SystemTypeCache.MethodBase_GetMethodFromHandle2);
_ilg.Emit (OpCodes.Castclass, typeof(ConstructorInfo));
| MethodOf(from_type, method, typars) =>
def methodInfo = GetMethodInfo(from_type, method, typars);
def declTy = methodInfo.DeclaringType;
_ilg.Emit (OpCodes.Ldtoken, methodInfo);
if (declTy == null)
_ilg.Emit (OpCodes.Call, SystemTypeCache.MethodBase_GetMethodFromHandle);
else
{
_ilg.Emit (OpCodes.Ldtoken, declTy);
_ilg.Emit (OpCodes.Call, SystemTypeCache.MethodBase_GetMethodFromHandle2);
}
_ilg.Emit (OpCodes.Castclass, typeof(MethodInfo));
| ClosureObjectOf(TExpr.FieldMember(obj, _)) => emit(obj);
| ClosureFieldOf(TExpr.FieldMember(obj, field)) => emit(TExpr.FieldOf(obj.Type, field));
| ClosureObjectOf => assert(false, "You mast put into ClosureObjectOf only TExpr.LocalRef which will be closured by compiler");
| ClosureFieldOf => assert(false, "You mast put into ClosureFieldOf only TExpr.LocalRef which will be closured by compiler");
| FieldOf(ty, field) =>
def fielfInfo = GetFieldInfo(ty.GetSystemType(), field);
def declTy = fielfInfo.DeclaringType;
_ilg.Emit (OpCodes.Ldtoken, fielfInfo);
if (declTy == null)
_ilg.Emit (OpCodes.Call, SystemTypeCache.FieldInfo_GetFieldFromHandle);
else
{
_ilg.Emit (OpCodes.Ldtoken, declTy);
_ilg.Emit (OpCodes.Call, SystemTypeCache.FieldInfo_GetFieldFromHandle2);
}
_ilg.Emit (OpCodes.Castclass, typeof(FieldInfo));
/* load runtime representation of given type */
| TypeOf (t) =>
_ilg.Emit (OpCodes.Ldtoken, t.GetSystemType ());
_ilg.Emit (OpCodes.Call, SystemTypeCache.Type_GetTypeFromHandle);
/* emits the TExpr.Switch instruction */
| Switch (indexing_expr, default_expr, cases) =>
match (cases) {
| [] => Message.Warning ("empty TExpr.Switch instruction");
| _ =>
emit (indexing_expr);
emit_switch (default_expr, cases)
}
| MacroEnvelope (_, _, expr, _) =>
emit (expr)
| Label(id, DefaultValue as nextExpr) when nextExpr.Type is FixedType.Void with reset_throw = true // VladD2: This is a workaround for "dead code" hack.
// The Label(_, DefaultValue) is usually generated by macros. And macros are responsible for the lack of dead code.
| Label(id, nextExpr) with reset_throw = false =>
// insert label so TExpr.Goto can work
if (_labels.Contains(id))
_label_usage[id] = null;
else
_labels[id] = _ilg.DefineLabel();
_ilg.MarkLabel(_labels[id], reset_throw);
emit(nextExpr);
| Goto (id, try_block) =>
if (_labels.Contains (id))
_label_usage [id] = null;
else
{
_label_usage [id] = expr;
_labels [id] = _ilg.DefineLabel ();
}
if (try_block == 0)
_ilg.Emit (OpCodes.Br, _labels [id]);
else
{
// Message.Warning (expr.loc, $"emit leave, id=$id");
_ilg.Emit (OpCodes.Leave, _labels [id]);
}
/* -- TYPE CONVERSIONS --------------------------------------------- */
// when expr throws we shouldn't emit anything
| TypeConversion (expr, _, _, _) when expr.Throws => emit (expr)
| TypeConversion(expr, target_type, _, _) when target_type.IsPointer => emit_value_to_ptr_conversion(expr, target_type);
| TypeConversion (expr, cast_to_type, _, _) /* do not perform casts between same types */
when no_cast_needed (expr.GetSystemType (), cast_to_type.GetSystemType ()) => emit (expr)
| TypeConversion (expr, cast_to_type, ConversionKind.Boxing, _) // special case for 'a : 'b conversion
when cast_to_type.GetSystemType ().IsGenericParameter =>
emit (expr);
_ilg.Emit (OpCodes.Box, expr.GetSystemType ());
_ilg.Emit (OpCodes.Unbox_Any, cast_to_type.GetSystemType ());
| TypeConversion (expr, cast_to_type, _, _) when cast_to_type.GetSystemType ().IsGenericParameter =>
emit (expr);
when (expr.FixedType().IsValueType || expr.FixedType() is FixedType.StaticTypeVarRef)
_ilg.Emit (OpCodes.Box, expr.GetSystemType ());
_ilg.Emit (OpCodes.Unbox_Any, cast_to_type.GetSystemType ());
| TypeConversion (ignored, ty, _, _) when is_void (ty) =>
// a little trickery, so emit can be tail called sometimes
if (is_void (ignored.Type))
emit (ignored)
else {
emit (ignored);
_ilg.Emit (OpCodes.Pop);
}
/* to nonvalue type */
| TypeConversion(expr, cast_to_type, kind, _) when !cast_to_type.Fix().IsValueType =>
emit(expr);
if (is_void(expr.Type))
/* special case casts from void */
_ilg.Emit (OpCodes.Ldnull);
else if (expr.GetSystemType().IsGenericParameter)
{
_ilg.Emit (OpCodes.Box, expr.GetSystemType());
unless (cast_to_type.Fix().IsSystemObject)
if (cast_to_type.Fix().IsValueType)
_ilg.Emit(OpCodes.Unbox_Any, cast_to_type.GetSystemType());
else
_ilg.Emit(OpCodes.Castclass, cast_to_type.GetSystemType());
}
else if (expr.GetSystemType().IsValueType)
{
// Message.Debug (k.ToString ());
// box value types casted to non value types
_ilg.Emit(OpCodes.Box, expr.GetSystemType ());
}
else
{
// upcast / downcast non-value types
def castToFixedType = cast_to_type.Fix();
def cast_to_type = cast_to_type.GetSystemType();
when (expr.GetSystemType().IsArray && cast_to_type.IsArray
&& expr.GetSystemType().GetElementType().IsValueType != cast_to_type.GetElementType().IsValueType)
{
Message.Error(expr.Location, $"attempting to cast a value type array $(expr.GetSystemType ()) to non-value type array $(cast_to_type) which cannot succeed");
}
def isUpCast = kind is ConversionKind.UpCast;
when (!isUpCast || castToFixedType.IsInterface)
_ilg.Emit(OpCodes.Castclass, cast_to_type);
}
// unbox value types or perform value type conversion
| TypeConversion (val, cast_to_type, kind, _) =>
def is_checked = ! (kind is IL (false));
emit (val);
def type_of_expr = val.GetSystemType ();
def cast_to_stype = cast_to_type.GetSystemType ();
def is_generic =
if (type_of_expr.IsGenericParameter) {
_ilg.Emit (OpCodes.Box, type_of_expr);
true
} else false;
if (type_of_expr.IsValueType) {
/* perform conversion of value types */
emit_value_type_conversion (expr.Location, val.FixedType(), cast_to_type.Fix (), is_checked)
}
else if (is_generic ||
SystemTypeCache.Object : object == type_of_expr ||
type_of_expr.IsInterface ||
(SystemTypeCache.Enum : object == type_of_expr && cast_to_stype.IsEnum)) {
/* unboxing returns a pointer to a value */
_ilg.Emit (OpCodes.Unbox, cast_to_stype);
maybe_volatile (val);
emit_ldind_for_value_type (cast_to_stype)
}
else
Util.ice($"$_method_name: failed to convert non-value type $type_of_expr to a value type $cast_to_type");
/* -- REFERENCES --------------------------------------------------- */
/* load the value of a local variable or a method parameter */
| LocalRef (decl) =>
unless (is_void (decl.Type))
emit_ce_ref (decl, get_address_for_value_types = expr.NeedAddress)
/* load the value of a field */
| FieldMember (base_object, field) =>
def result_will_be_address = expr.NeedAddress;
if (result_will_be_address)
_ = emit_and_convert_to_address (base_object);
else
emit (base_object);
maybe_volatile (expr);
def field_info = GetFieldInfo (base_object, field);
when (base_object.GetSystemType ().IsGenericParameter)
_ilg.Emit (OpCodes.Box, base_object.GetSystemType ());
if (result_will_be_address)
_ilg.Emit(OpCodes.Ldflda, field_info);
else
_ilg.Emit(OpCodes.Ldfld, field_info);
emit_tuple_function_conversion (expr.FixedType(), base_object.FixedType(), field);
/* load the value of a static field */
| StaticRef (t, field is IField, _) =>
def field_info = GetFieldInfo (t.GetSystemType (), field);
assert(field_info.IsStatic, "GlobalRef to a non-static field");
when (field_info.IsLiteral)
// should not happen
Message.Warning ("loading literal as field `" + field_info.ToString () + "'");
maybe_volatile (expr);
if (expr.NeedAddress) {
if(field.IsMutable)
_ilg.Emit (OpCodes.Ldsflda, field_info);
else {
def temp = _ilg.DeclareLocal (field.GetMemType().GetSystemType ());
_ilg.Emit (OpCodes.Ldsfld, field_info);
_ilg.Emit (OpCodes.Stloc, temp);
_ilg.Emit (OpCodes.Ldloca, temp);
}
}
else
_ilg.Emit (OpCodes.Ldsfld, field_info);
emit_tuple_function_conversion (expr.FixedType(), t, field);
| PointerIndexer(ptr, index) => emit_ptr_indexing(expr.NeedAddress, ptr, index);
// load an array element
| ArrayIndexer (array_obj, [index]) =>
emit_exprs ([array_obj, index]);
def element_type = array_obj.GetSystemType ().GetElementType ();
assert(element_type != null, "non-array in TExpr.ArrayIndexer");
if (expr.NeedAddress)
_ilg.Emit (OpCodes.Ldelema, element_type)
else
emit_array_load_opcode (element_type);
| ArrayIndexer (array_obj, indexes) =>
emit_exprs ([array_obj] + indexes);
def method =
if (expr.NeedAddress) array_addr_method (array_obj)
else array_get_method (array_obj);
emit_method_call (expr, true, method);