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Diffstat (limited to 'src/ortho/mcode/ortho_code-exprs.ads')
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1 files changed, 600 insertions, 0 deletions
diff --git a/src/ortho/mcode/ortho_code-exprs.ads b/src/ortho/mcode/ortho_code-exprs.ads new file mode 100644 index 0000000..9bd4596 --- /dev/null +++ b/src/ortho/mcode/ortho_code-exprs.ads @@ -0,0 +1,600 @@ +-- Mcode back-end for ortho - Expressions and control handling. +-- Copyright (C) 2006 Tristan Gingold +-- +-- GHDL is free software; you can redistribute it and/or modify it under +-- the terms of the GNU General Public License as published by the Free +-- Software Foundation; either version 2, or (at your option) any later +-- version. +-- +-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY +-- WARRANTY; without even the implied warranty of MERCHANTABILITY or +-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +-- for more details. +-- +-- You should have received a copy of the GNU General Public License +-- along with GCC; see the file COPYING. If not, write to the Free +-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA +-- 02111-1307, USA. +package Ortho_Code.Exprs is + type OE_Kind is + ( + OE_Nil, + + -- Dyadic operations. + -- ARG1 is left, ARG2 is right. + OE_Add_Ov, + OE_Sub_Ov, + OE_Mul_Ov, + OE_Div_Ov, + OE_Rem, + OE_Mod, + + OE_And, + OE_Or, + OE_Xor, + + -- Monadic operations. + -- ARG1 is expression. + OE_Not, + OE_Neg_Ov, + OE_Abs_Ov, + + -- Comparaison. + -- ARG1 is left, ARG2 is right. + OE_Eq, + OE_Neq, + OE_Le, + OE_Lt, + OE_Ge, + OE_Gt, + + -- Without checks, for addresses. + OE_Add, + OE_Mul, + OE_Shl, -- Left shift + + -- A literal. + -- ARG1 is low part, ARG2 is high part. + OE_Const, + + -- Address of a local variable/parameter. + -- ARG1 is object. + -- ARG2 is the frame pointer or O_Enode_Null for current frame pointer. + OE_Addrl, + -- Address of a global variable. + -- ARG1 is object. + OE_Addrg, + + -- Pointer dereference. + -- ARG1 is operand. + OE_Indir, + + -- Conversion. + -- ARG1 is expression. + -- ARG2: type + OE_Conv_Ptr, + OE_Conv, + + -- Typed expression. + OE_Typed, + + -- Local memory allocation. + -- ARG1 is size (in bytes). + OE_Alloca, + + -- Statements. + + -- Subrogram entry. + -- ARG1 is the corresponding Leave (used to skip inner subprograms). + -- ARG2 is unused. + OE_Entry, + -- Subprogram exit. + -- ARG1 and ARG2 are unused. + OE_Leave, + + -- Declaration blocks. + -- ARG1: parent + -- ARG2: corresponding declarations. + OE_Beg, + -- ARG1: corresponding beg + -- ARG2: unsused. + OE_End, + + -- Assignment. + -- ARG1 is value, ARG2 is target (address). + OE_Asgn, + + -- Subprogram calls. + -- ARG1 is value + -- ARG2 is link to the next argument. + OE_Arg, + -- ARG1 is subprogram + -- ARG2 is arguments. + OE_Call, + -- ARG1 is intrinsic operation. + OE_Intrinsic, + + -- Modify the stack pointer value, to align the stack before pushing + -- arguments, or to free the stack. + -- ARG1 is the signed offset. + OE_Stack_Adjust, + + -- Return ARG1 (if not mode_nil) from current subprogram. + -- ARG1: expression. + OE_Ret, + + -- Line number (for debugging). + -- ARG1: line number + OE_Line, + + -- High level instructions. + + -- Basic block. + -- ARG1: next BB + -- ARG2: number + OE_BB, + + -- ARG1 is the literal. + OE_Lit, + -- ARG1: value + -- ARG2: first branch (HLI only). + OE_Case, + -- ARG1: the corresponding OE_Case + OE_Case_Expr, + -- ARG1: left bound + -- ARG2: right bound + -- LINK: choice link + OE_Case_Choice, + -- ARG1: choice link + -- ARG2: next branch + OE_Case_Branch, + -- End of case. + OE_Case_End, + + -- ARG1: the condition + -- ARG2: the else/endif + OE_If, + OE_Else, + OE_Endif, + + -- ARG1: loop level. + OE_Loop, + -- ARG1: loop. + OE_Eloop, + -- ARG2: loop. + OE_Next, + OE_Exit, + + -- ARG1: the record + -- ARG2: the field + OE_Record_Ref, + + -- ARG1: the expression. + OE_Access_Ref, + + -- ARG1: the array + -- ARG2: the index + OE_Index_Ref, + OE_Slice_Ref, + + -- Low level instructions. + + -- Label. + -- ARG1: current block (used for alloca), only during tree building. + -- ARG2: user info (generally used to store symbol). + OE_Label, + + -- Jump to ARG2. + OE_Jump, + + -- Jump to ARG2 if ARG1 is true/false. + OE_Jump_T, + OE_Jump_F, + + -- Used internally only. + -- ARG2 is info/target, ARG1 is expression (if any). + OE_Spill, + OE_Reload, + OE_Move, + + -- Alloca/allocb handling. + OE_Get_Stack, + OE_Set_Stack, + + -- Get current frame pointer. + OE_Get_Frame, + + -- Additionnal reg + OE_Reg + ); + for OE_Kind'Size use 8; + + subtype OE_Kind_Dyadic is OE_Kind range OE_Add_Ov .. OE_Xor; + subtype OE_Kind_Cmp is OE_Kind range OE_Eq .. OE_Gt; + + + -- BE representation of an instruction. + type O_Insn is mod 256; + + type Subprogram_Data; + type Subprogram_Data_Acc is access Subprogram_Data; + + type Subprogram_Data is record + -- Parent or null if top-level subprogram. + Parent : Subprogram_Data_Acc; + + -- Block in which this subprogram is declared, or o_dnode_null if + -- top-level subprogram. + --Parent_Block : O_Dnode; + + -- First and last child, or null if no children. + First_Child : Subprogram_Data_Acc; + Last_Child : Subprogram_Data_Acc; + + -- Next subprogram at the same depth level. + Brother : Subprogram_Data_Acc; + + -- Depth of the subprogram. + Depth : O_Depth; + + -- Dnode for the declaration. + D_Decl : O_Dnode; + + -- Enode for the Entry. + E_Entry : O_Enode; + + -- Dnode for the Body. + D_Body : O_Dnode; + + -- Label just before leave. + Exit_Label : O_Enode; + + -- Last statement of this subprogram. + Last_Stmt : O_Enode; + + -- Static maximum stack use. + Stack_Max : Uns32; + end record; + + -- Data for the current subprogram. + Cur_Subprg : Subprogram_Data_Acc := null; + + -- First and last (top-level) subprogram. + First_Subprg : Subprogram_Data_Acc := null; + Last_Subprg : Subprogram_Data_Acc := null; + + -- Type of the stack pointer - for OE_Get_Stack and OE_Set_Stack. + -- Can be set by back-ends. + Stack_Ptr_Type : O_Tnode := O_Tnode_Null; + + -- Create a new node. + -- Should be used only by back-end to add internal nodes. + function New_Enode (Kind : OE_Kind; + Mode : Mode_Type; + Rtype : O_Tnode; + Arg1 : O_Enode; + Arg2 : O_Enode) return O_Enode; + + -- Get the kind of ENODE. + function Get_Expr_Kind (Enode : O_Enode) return OE_Kind; + pragma Inline (Get_Expr_Kind); + + -- Get the mode of ENODE. + function Get_Expr_Mode (Enode : O_Enode) return Mode_Type; + pragma Inline (Get_Expr_Mode); + + -- Get/Set the register of ENODE. + function Get_Expr_Reg (Enode : O_Enode) return O_Reg; + procedure Set_Expr_Reg (Enode : O_Enode; Reg : O_Reg); + pragma Inline (Get_Expr_Reg); + pragma Inline (Set_Expr_Reg); + + -- Get the operand of an unary expression. + function Get_Expr_Operand (Enode : O_Enode) return O_Enode; + procedure Set_Expr_Operand (Enode : O_Enode; Val : O_Enode); + + -- Get left/right operand of a binary expression. + function Get_Expr_Left (Enode : O_Enode) return O_Enode; + function Get_Expr_Right (Enode : O_Enode) return O_Enode; + procedure Set_Expr_Left (Enode : O_Enode; Val : O_Enode); + procedure Set_Expr_Right (Enode : O_Enode; Val : O_Enode); + + -- Get the low and high part of an OE_CONST node. + function Get_Expr_Low (Cst : O_Enode) return Uns32; + function Get_Expr_High (Cst : O_Enode) return Uns32; + + -- Get target of the assignment. + function Get_Assign_Target (Enode : O_Enode) return O_Enode; + procedure Set_Assign_Target (Enode : O_Enode; Targ : O_Enode); + + -- For OE_Lit: get the literal. + function Get_Expr_Lit (Lit : O_Enode) return O_Cnode; + + -- Type of a OE_Conv/OE_Nop/OE_Typed/OE_Alloca + -- Used only for display/debugging purposes. + function Get_Conv_Type (Enode : O_Enode) return O_Tnode; + + -- Leave node corresponding to the entry. + function Get_Entry_Leave (Enode : O_Enode) return O_Enode; + + -- Get the label of a jump/ret + function Get_Jump_Label (Enode : O_Enode) return O_Enode; + procedure Set_Jump_Label (Enode : O_Enode; Label : O_Enode); + + -- Get the object of addrl,addrp,addrg + function Get_Addr_Object (Enode : O_Enode) return O_Dnode; + + -- Get the computed frame for the object. + -- If O_Enode_Null, then use current frame. + function Get_Addrl_Frame (Enode : O_Enode) return O_Enode; + procedure Set_Addrl_Frame (Enode : O_Enode; Frame : O_Enode); + + -- Return the stack adjustment. For positive values, this is the amount of + -- bytes to allocate on the stack before pushing arguments, so that the + -- stack pointer stays aligned. For negtive values, this is the amount of + -- bytes to release on the stack. + function Get_Stack_Adjust (Enode : O_Enode) return Int32; + + -- Get the subprogram called by ENODE. + function Get_Call_Subprg (Enode : O_Enode) return O_Dnode; + + -- Get the first argument of a call, or the next argument of an arg. + function Get_Arg_Link (Enode : O_Enode) return O_Enode; + + -- Get the declaration chain of a Beg statement. + function Get_Block_Decls (Blk : O_Enode) return O_Dnode; + + -- Get the parent of the block. + function Get_Block_Parent (Blk : O_Enode) return O_Enode; + + -- Get the corresponding beg. + function Get_End_Beg (Blk : O_Enode) return O_Enode; + + -- True if the block contains an alloca insn. + function Get_Block_Has_Alloca (Blk : O_Enode) return Boolean; + + -- Set the next branch of a case/case_branch. + procedure Set_Case_Branch (C : O_Enode; Branch : O_Enode); + + -- Set the first choice of a case branch. + procedure Set_Case_Branch_Choice (Branch : O_Enode; Choice : O_Enode); + function Get_Case_Branch_Choice (Branch : O_Enode) return O_Enode; + + -- Set the choice link of a case choice. + procedure Set_Case_Choice_Link (Choice : O_Enode; N_Choice : O_Enode); + function Get_Case_Choice_Link (Choice : O_Enode) return O_Enode; + + -- Get/Set the max stack size for the end block BLKE. + --function Get_Block_Max_Stack (Blke : O_Enode) return Int32; + --procedure Set_Block_Max_Stack (Blke : O_Enode; Max : Int32); + + -- Get the field of an o_record_ref node. + function Get_Ref_Field (Ref : O_Enode) return O_Fnode; + + -- Get the index of an OE_Index_Ref or OE_Slice_Ref node. + function Get_Ref_Index (Ref : O_Enode) return O_Enode; + + -- Get/Set the info field of a label. + function Get_Label_Info (Label : O_Enode) return Int32; + procedure Set_Label_Info (Label : O_Enode; Info : Int32); + + -- Get the info of a spill. + function Get_Spill_Info (Spill : O_Enode) return Int32; + procedure Set_Spill_Info (Spill : O_Enode; Info : Int32); + + -- Get the statement link. + function Get_Stmt_Link (Stmt : O_Enode) return O_Enode; + procedure Set_Stmt_Link (Stmt : O_Enode; Next : O_Enode); + + -- Get the line number of an OE_Line statement. + function Get_Expr_Line_Number (Stmt : O_Enode) return Int32; + + -- Get the operation of an intrinsic. + function Get_Intrinsic_Operation (Stmt : O_Enode) return Int32; + + -- Get the basic block label (uniq number). + function Get_BB_Number (Stmt : O_Enode) return Int32; + + -- For OE_Loop, set loop level (an integer). + -- Reserved for back-end in HLI mode only. + function Get_Loop_Level (Stmt : O_Enode) return Int32; + procedure Set_Loop_Level (Stmt : O_Enode; Level : Int32); + + -- Start a subprogram body. + -- Note: the declaration may have an external storage, in this case it + -- becomes public. + procedure Start_Subprogram_Body (Func : O_Dnode); + + -- Finish a subprogram body. + procedure Finish_Subprogram_Body; + + -- Translate a scalar literal into an expression. + function New_Lit (Lit : O_Cnode) return O_Enode; + + -- Translate an object (var, const or interface) into an lvalue. + function New_Obj (Obj : O_Dnode) return O_Lnode; + + -- Create a dyadic operation. + -- Left and right nodes must have the same type. + -- Binary operation is allowed only on boolean types. + -- The result is of the type of the operands. + function New_Dyadic_Op (Kind : ON_Dyadic_Op_Kind; Left, Right : O_Enode) + return O_Enode; + + -- Create a monadic operation. + -- Result is of the type of operand. + function New_Monadic_Op (Kind : ON_Monadic_Op_Kind; Operand : O_Enode) + return O_Enode; + + -- Create a comparaison operator. + -- NTYPE is the type of the result and must be a boolean type. + function New_Compare_Op + (Kind : ON_Compare_Op_Kind; Left, Right : O_Enode; Ntype : O_Tnode) + return O_Enode; + + -- Returns the size in bytes of ATYPE. The result is a literal of + -- unsigned type RTYPE + -- ATYPE cannot be an unconstrained array type. + function New_Sizeof (Atype : O_Tnode; Rtype : O_Tnode) return O_Enode; + + -- Returns the offset of FIELD in its record. The result is a literal + -- of unsigned type RTYPE. + function New_Offsetof (Field : O_Fnode; Rtype : O_Tnode) return O_Enode; + + -- Get an element of an array. + -- INDEX must be of the type of the array index. + function New_Indexed_Element (Arr : O_Lnode; Index : O_Enode) + return O_Lnode; + + -- Get a slice of an array; this is equivalent to a conversion between + -- an array or an array subtype and an array subtype. + -- RES_TYPE must be an array_sub_type whose base type is the same as the + -- base type of ARR. + -- INDEX must be of the type of the array index. + function New_Slice (Arr : O_Lnode; Res_Type : O_Tnode; Index : O_Enode) + return O_Lnode; + + -- Get an element of a record. + -- Type of REC must be a record type. + function New_Selected_Element (Rec : O_Lnode; El : O_Fnode) + return O_Lnode; + + -- Reference an access. + -- Type of ACC must be an access type. + function New_Access_Element (Acc : O_Enode) return O_Lnode; + + -- Do a conversion. + -- Allowed conversions are: + -- FIXME: to write. + function New_Convert_Ov (Val : O_Enode; Rtype : O_Tnode) return O_Enode; + + -- Get the address of LVALUE. + -- ATYPE must be a type access whose designated type is the type of LVALUE. + -- FIXME: what about arrays. + function New_Address (Lvalue : O_Lnode; Atype : O_Tnode) return O_Enode; + + -- Same as New_Address but without any restriction. + function New_Unchecked_Address (Lvalue : O_Lnode; Atype : O_Tnode) + return O_Enode; + + -- Get the address of a subprogram. + function New_Subprogram_Address (Subprg : O_Dnode; Atype : O_Tnode) + return O_Enode; + + -- Get the value of an Lvalue. + function New_Value (Lvalue : O_Lnode) return O_Enode; + + -- Return a pointer of type RTPE to SIZE bytes allocated on the stack. + function New_Alloca (Rtype : O_Tnode; Size : O_Enode) return O_Enode; + + type O_Assoc_List is limited private; + + -- Create a function call or a procedure call. + procedure Start_Association (Assocs : out O_Assoc_List; Subprg : O_Dnode); + procedure New_Association (Assocs : in out O_Assoc_List; Val : O_Enode); + function New_Function_Call (Assocs : O_Assoc_List) return O_Enode; + procedure New_Procedure_Call (Assocs : in out O_Assoc_List); + + -- Assign VALUE to TARGET, type must be the same or compatible. + -- FIXME: what about slice assignment? + procedure New_Assign_Stmt (Target : O_Lnode; Value : O_Enode); + + -- Exit from the subprogram and return VALUE. + procedure New_Return_Stmt (Value : O_Enode); + -- Exit from the subprogram, which doesn't return value. + procedure New_Return_Stmt; + + type O_If_Block is limited private; + + -- Build an IF statement. + procedure Start_If_Stmt (Block : out O_If_Block; Cond : O_Enode); + procedure New_Else_Stmt (Block : in out O_If_Block); + procedure Finish_If_Stmt (Block : in out O_If_Block); + + type O_Snode is private; + O_Snode_Null : constant O_Snode; + + -- Create a infinite loop statement. + procedure Start_Loop_Stmt (Label : out O_Snode); + procedure Finish_Loop_Stmt (Label : in out O_Snode); + + -- Exit from a loop stmt or from a for stmt. + procedure New_Exit_Stmt (L : O_Snode); + -- Go to the start of a loop stmt or of a for stmt. + -- Loops/Fors between L and the current points are exited. + procedure New_Next_Stmt (L : O_Snode); + + -- Case statement. + -- VALUE is the selector and must be a discrete type. + type O_Case_Block is limited private; + procedure Start_Case_Stmt (Block : out O_Case_Block; Value : O_Enode); + procedure Start_Choice (Block : in out O_Case_Block); + procedure New_Expr_Choice (Block : in out O_Case_Block; Expr : O_Cnode); + procedure New_Range_Choice (Block : in out O_Case_Block; + Low, High : O_Cnode); + procedure New_Default_Choice (Block : in out O_Case_Block); + procedure Finish_Choice (Block : in out O_Case_Block); + procedure Finish_Case_Stmt (Block : in out O_Case_Block); + + procedure Start_Declare_Stmt; + procedure Finish_Declare_Stmt; + + procedure New_Debug_Line_Stmt (Line : Natural); + + procedure Disp_Subprg_Body (Indent : Natural; Subprg : O_Enode); + procedure Disp_All_Enode; + procedure Disp_Stats; + + type Mark_Type is limited private; + procedure Mark (M : out Mark_Type); + procedure Release (M : Mark_Type); + + procedure Finish; +private + type O_Assoc_List is record + -- Subprogram being called. + Subprg : O_Dnode; + -- First and last argument statement. + First_Arg : O_Enode; + Last_Arg : O_Enode; + -- Interface for the next association. + Next_Inter : O_Dnode; + end record; + + type O_Case_Block is record + -- Expression for the selection. + Expr : O_Enode; + + -- Type of expression. + -- Used to perform checks. + Expr_Type : O_Tnode; + + -- Choice code and branch code is not mixed (anymore). + -- Therefore, code to perform choices is inserted. + -- Last node of the choice code. + Last_Node : O_Enode; + + -- Label at the end of the case statement. + -- used to jump from the end of a branch to the end of the statement. + Label_End : O_Enode; + + -- Label of the branch code. + Label_Branch : O_Enode; + end record; + + type O_If_Block is record + Label_End : O_Enode; + Label_Next : O_Enode; + end record; + + type O_Snode is record + Label_Start : O_Enode; + Label_End : O_Enode; + end record; + O_Snode_Null : constant O_Snode := (Label_Start => O_Enode_Null, + Label_End => O_Enode_Null); + + type Mark_Type is record + Enode : O_Enode; + end record; +end Ortho_Code.Exprs; |