projects/ldc: gen/irstate.h annotate

annotate gen/irstate.h @ 233:76ee1bbe487e trunk

[svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers.

author	lindquist
date	Sun, 08 Jun 2008 06:45:54 +0200
parents	092468448d25
children	fc9c1a0eabbd

rev	line source
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	1 #ifndef LLVMDC_GEN_IRSTATE_H
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	2 #define LLVMDC_GEN_IRSTATE_H
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	3
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	4 #include <vector>
102 027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	5 #include <list>
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	6
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	7 #include "root.h"
113 27b9f749d9fe [svn r117] Initial working implementation of interfaces. lindquist parents: 108 diff changeset	8 #include "aggregate.h"
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	9
136 0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	10 #include "ir/irfunction.h"
0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	11 #include "ir/irstruct.h"
0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	12 #include "ir/irvar.h"
0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	13
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	14 // global ir state for current module
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	15 struct IRState;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	16 extern IRState* gIR;
73 b706170e24a9 [svn r77] Fixed foreach on slice. lindquist parents: 54 diff changeset	17 extern const llvm::TargetData* gTargetData;
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	18
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	19 struct TypeFunction;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	20 struct TypeStruct;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	21 struct ClassDeclaration;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	22 struct FuncDeclaration;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	23 struct Module;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	24 struct TypeStruct;
113 27b9f749d9fe [svn r117] Initial working implementation of interfaces. lindquist parents: 108 diff changeset	25 struct BaseClass;
145 8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	26 struct TryFinallyStatement;
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	27
156 ccd07d9f2ce9 [svn r172] moving all IR state previously stored in Dsymbol into IrDsymbol and a Dsymbol->IrDsymbol map ChristianK parents: 155 diff changeset	28 struct IrModule;
ccd07d9f2ce9 [svn r172] moving all IR state previously stored in Dsymbol into IrDsymbol and a Dsymbol->IrDsymbol map ChristianK parents: 155 diff changeset	29
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	30 // represents a scope
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	31 struct IRScope
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	32 {
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	33 llvm::BasicBlock* begin;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	34 llvm::BasicBlock* end;
205 9d44ec83acd1 [svn r221] Update: Switched to the 2.3 LLVM svn branch, http://llvm.org/svn/llvm-project/llvm/branches/release_23 . lindquist parents: 189 diff changeset	35 IRBuilder builder;
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	36
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	37 IRScope();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	38 IRScope(llvm::BasicBlock* b, llvm::BasicBlock* e);
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	39 };
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	40
145 8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	41 // scope for loops
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	42 struct IRLoopScope : IRScope
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	43 {
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	44 // generating statement
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	45 Statement* s;
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	46 // the try of a TryFinally that encloses the loop
148 86d3bb8ca33e [svn r154] renaming enclosingtry to enclosingtryfinally to distinguish it from enclosingtrycatch, which will probably need to be added for exception handling ChristianK parents: 145 diff changeset	47 TryFinallyStatement* enclosingtryfinally;
145 8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	48
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	49 IRLoopScope();
148 86d3bb8ca33e [svn r154] renaming enclosingtry to enclosingtryfinally to distinguish it from enclosingtrycatch, which will probably need to be added for exception handling ChristianK parents: 145 diff changeset	50 IRLoopScope(Statement* s, TryFinallyStatement* enclosingtryfinally, llvm::BasicBlock* b, llvm::BasicBlock* e);
145 8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	51 };
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	52
40 8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	53 struct IRBuilderHelper
8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	54 {
8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	55 IRState* state;
205 9d44ec83acd1 [svn r221] Update: Switched to the 2.3 LLVM svn branch, http://llvm.org/svn/llvm-project/llvm/branches/release_23 . lindquist parents: 189 diff changeset	56 IRBuilder* operator->();
40 8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	57 };
8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	58
54 28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	59 struct IRExp
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	60 {
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	61 Expression* e1;
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	62 Expression* e2;
86 fd32135dca3e [svn r90] Major updates to the gen directory. Redesigned the 'elem' struct. Much more... !!! lindquist parents: 82 diff changeset	63 DValue* v;
54 28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	64 IRExp();
86 fd32135dca3e [svn r90] Major updates to the gen directory. Redesigned the 'elem' struct. Much more... !!! lindquist parents: 82 diff changeset	65 IRExp(Expression* l, Expression* r, DValue* val);
54 28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	66 };
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	67
232 092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	68 struct IRAsmStmt
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	69 {
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	70 std::string code;
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	71 std::string out_c;
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	72 std::string in_c;
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	73 std::vector<LLValue*> out;
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	74 std::vector<LLValue*> in;
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	75 };
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	76
233 76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	77 struct IRAsmBlock
76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	78 {
76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	79 std::vector<IRAsmStmt*> s;
76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	80 std::set<std::string> clobs;
76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	81 };
76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	82
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	83 // represents the module
40 8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	84 struct IRState
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	85 {
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	86 IRState();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	87
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	88 // module
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	89 Module* dmodule;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	90 llvm::Module* module;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	91
161 3a891cfcd249 [svn r177] moved variable for interface info type from being local static to being within IRState ChristianK parents: 157 diff changeset	92 // interface info type, used in DtoInterfaceInfoType
3a891cfcd249 [svn r177] moved variable for interface info type from being local static to being within IRState ChristianK parents: 157 diff changeset	93 llvm::StructType* interfaceInfoType;
3a891cfcd249 [svn r177] moved variable for interface info type from being local static to being within IRState ChristianK parents: 157 diff changeset	94
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	95 // functions
136 0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	96 typedef std::vector<IrFunction*> FunctionVector;
40 8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	97 FunctionVector functions;
136 0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	98 IrFunction* func();
40 8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	99
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	100 llvm::Function* topfunc();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	101 TypeFunction* topfunctype();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	102 llvm::Instruction* topallocapoint();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	103
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	104 // structs
136 0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	105 typedef std::vector<IrStruct*> StructVector;
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	106 StructVector structs;
136 0e28624814e8 [svn r140] did a lot of the work towards being able to pass multiple modules on the command line. not complete yet though lindquist parents: 116 diff changeset	107 IrStruct* topstruct();
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	108
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	109 // classes TODO move into IRClass
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	110 typedef std::vector<ClassDeclaration*> ClassDeclVec;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	111 ClassDeclVec classes;
15 37a4fdab33fc [svn r19] * Added support for reassigning 'this' inside class constructors. lindquist parents: 6 diff changeset	112
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	113 // D main function
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	114 bool emitMain;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	115 llvm::Function* mainFunc;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	116
54 28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	117 // expression l/r value handling
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	118 typedef std::vector<IRExp> ExpVec;
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	119 ExpVec exps;
28e99b04a132 [svn r58] Fixed cond expression resulting in a non-basic type. lindquist parents: 40 diff changeset	120 IRExp* topexp();
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	121
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	122 // basic block scopes
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	123 std::vector<IRScope> scopes;
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	124 IRScope& scope();
108 288fe1029e1f [svn r112] Fixed 'case 1,2,3:' style case statements. lindquist parents: 103 diff changeset	125 llvm::BasicBlock* scopebb();
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	126 llvm::BasicBlock* scopeend();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	127 bool scopereturned();
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	128
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	129 // loop blocks
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	130 typedef std::vector<IRScope> BBVec;
145 8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	131 typedef std::vector<IRLoopScope> LoopScopeVec;
8f704cb9969b [svn r150] fixes #16 and #17, implements GotoCaseStatement ChristianK parents: 136 diff changeset	132 LoopScopeVec loopbbs;
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	133
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	134 // this holds the array being indexed or sliced so $ will work
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	135 // might be a better way but it works. problem is I only get a
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	136 // VarDeclaration for __dollar, but I can't see how to get the
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	137 // array pointer from this :(
86 fd32135dca3e [svn r90] Major updates to the gen directory. Redesigned the 'elem' struct. Much more... !!! lindquist parents: 82 diff changeset	138 std::vector<DValue*> arrays;
15 37a4fdab33fc [svn r19] * Added support for reassigning 'this' inside class constructors. lindquist parents: 6 diff changeset	139
40 8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	140 // builder helper
8b0e809563df [svn r44] Lots of bug fixes. lindquist parents: 31 diff changeset	141 IRBuilderHelper ir;
98 6789050b5ad1 [svn r102] Further delayed emission of function bodies to avoid problems with circular-forward-references. lindquist parents: 94 diff changeset	142
102 027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	143 typedef std::list<Dsymbol*> DsymbolList;
027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	144 // dsymbols that need to be resolved
027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	145 DsymbolList resolveList;
027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	146 // dsymbols that need to be declared
027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	147 DsymbolList declareList;
100 5071469303d4 [svn r104] TONS OF FIXES. lindquist parents: 98 diff changeset	148 // dsymbols that need constant initializers constructed
102 027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	149 DsymbolList constInitList;
027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	150 // dsymbols that need definitions
027b8d8b71ec [svn r106] Turns out the last commit wasn't enough, now the D->LLVM process is even more split up. lindquist parents: 100 diff changeset	151 DsymbolList defineList;
116 fd7ad91fd713 [svn r120] ModuleInfo implementation is now almost complete. lindquist parents: 113 diff changeset	152
fd7ad91fd713 [svn r120] ModuleInfo implementation is now almost complete. lindquist parents: 113 diff changeset	153 // static ctors/dtors/unittests
fd7ad91fd713 [svn r120] ModuleInfo implementation is now almost complete. lindquist parents: 113 diff changeset	154 typedef std::vector<FuncDeclaration*> FuncDeclVector;
fd7ad91fd713 [svn r120] ModuleInfo implementation is now almost complete. lindquist parents: 113 diff changeset	155 FuncDeclVector ctors;
fd7ad91fd713 [svn r120] ModuleInfo implementation is now almost complete. lindquist parents: 113 diff changeset	156 FuncDeclVector dtors;
fd7ad91fd713 [svn r120] ModuleInfo implementation is now almost complete. lindquist parents: 113 diff changeset	157 FuncDeclVector unitTests;
232 092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	158
092468448d25 [svn r248] Fixed: labels in inline asm block now work for the normal case. lindquist parents: 213 diff changeset	159 // for inline asm
233 76ee1bbe487e [svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers. lindquist parents: 232 diff changeset	160 IRAsmBlock* asmBlock;
1 c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	161 };
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	162
c53b6e3fe49a [svn r5] Initial commit. Most things are very rough. lindquist parents: diff changeset	163 #endif // LLVMDC_GEN_IRSTATE_H

Mercurial > projects > ldc

annotate gen/irstate.h @ 233:76ee1bbe487e trunk