#include "bconfig.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "errors.h"
#include "read-md.h"
#include "gensupport.h"

Include dependency graph for genemit.c:

Data Structures
struct	clobber_pat
struct	clobber_ent

Functions
static void	print_code (RTX_CODE)
static void	gen_exp (rtx, enum rtx_code, char *)
static void	gen_insn (rtx, int)
static void	gen_expand (rtx)
static void	gen_split (rtx)
static void	output_add_clobbers (void)
static void	output_added_clobbers_hard_reg_p (void)
static void	gen_rtx_scratch (rtx, enum rtx_code)
static void	output_peephole2_scratches (rtx)
static void	print_code ()
static void	gen_rtx_scratch ()
static void	gen_exp ()
static void	gen_insn ()
static void	gen_expand ()
static void	gen_split ()
static void	output_peephole2_scratches ()
int	main ()

Variables
static int	insn_code_number
static int	insn_index_number
struct clobber_pat *	clobber_list

Function Documentation

static void gen_exp	(	rtx	,
		enum	rtx_code,
		char *
	)

static

static void gen_exp ( )

static

Print a C expression to construct an RTX just like X, substituting any operand references appearing within.

These shouldn't be written in MD files. Instead, the appropriate routines in varasm.c should be called.

static void gen_expand ( rtx )

static

static void gen_expand ( )

static

Generate the `gen_...' function for a DEFINE_EXPAND.

 Find out how many operands this function has.

 Output the function name and argument declarations.

 If we don't have any C code to write, only one insn is being written,
 and no MATCH_DUPs are present, we can just return the desired insn
 like we do for a DEFINE_INSN.  This saves memory.

 For each operand referred to only with MATCH_DUPs,
 make a local variable.

 The fourth operand of DEFINE_EXPAND is some code to be executed
 before the actual construction.
 This code expects to refer to `operands'
 just as the output-code in a DEFINE_INSN does,
 but here `operands' is an automatic array.
 So copy the operand values there before executing it.

     Output code to copy the arguments into `operands'.

     Output the special code to be executed before the sequence
     is generated.

     Output code to copy the arguments back out of `operands'
     (unless we aren't going to use them at all).

 Output code to construct the rtl for the instruction bodies.
 Use emit_insn to add them to the sequence being accumulated.
 But don't do this if the user's code has set `no_more' nonzero.

 Call `get_insns' to extract the list of all the
 insns emitted within this gen_... function.

static void gen_insn	(	rtx	,
		int
	)

static

static void gen_insn ( )

static

Generate the `gen_...' function for a DEFINE_INSN.

 See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 registers or MATCH_SCRATCHes.  If so, store away the information for
 later.

         See if any previous CLOBBER_LIST entry is the same as this
         one.

                 OLD and NEW_INSN are the same if both are to be a SCRATCH
                 of the same mode,
                 or if both are registers of the same mode and number.

 Don't mention instructions whose names are the null string
 or begin with '*'.  They are in the machine description just
 to be recognized.

 Find out how many operands this function has.

 Output the function name and argument declarations.

 Output code to construct and return the rtl for the instruction body.

References clobber_list, clobber_ent::code_number, clobber_pat::first_clobber, GET_CODE, GET_MODE, clobber_pat::has_hard_reg, insn_code_number, clobber_pat::insns, clobber_pat::next, clobber_ent::next, clobber_pat::pattern, REG_P, REGNO, XEXP, XVECEXP, and XVECLEN.

static void gen_rtx_scratch	(	rtx	,
		enum	rtx_code
	)

static

static void gen_rtx_scratch ( )

static

References XINT.

static void gen_split ( rtx )

static

static void gen_split ( )

static

Like gen_expand, but generates insns resulting from splitting SPLIT.

 Find out how many operands this function has.

 Output the prototype, function name and argument declarations.

 Declare all local variables.

 The fourth operand of DEFINE_SPLIT is some code to be executed
 before the actual construction.

 Output code to copy the arguments back out of `operands'

 Output code to construct the rtl for the instruction bodies.
 Use emit_insn to add them to the sequence being accumulated.
 But don't do this if the user's code has set `no_more' nonzero.

 Call `get_insns' to make a list of all the
 insns emitted within this gen_... function.

int main ( )

 Assign sequential codes to all entries in the machine description
 in parallel with the tables in insn-output.c.

 Read the machine description.

 Write out the routines to add CLOBBERs to a pattern and say whether they
 clobber a hard reg.

static void output_add_clobbers ( )

static

Write a function, `add_clobbers', that is given a PARALLEL of sufficient size for the insn and an INSN_CODE, and inserts the required CLOBBERs at the end of the vector.

References clobber_list, clobber_ent::code_number, clobber_pat::has_hard_reg, clobber_pat::insns, clobber_pat::next, and clobber_ent::next.

static void output_added_clobbers_hard_reg_p ( )

static

Write a function, `added_clobbers_hard_reg_p' that is given an insn_code number that will have clobbers added (as indicated by `recog') and returns 1 if those include a clobber of a hard reg or 0 if all of them just clobber SCRATCH.

References first, GET_CODE, XINT, XSTR, XVECEXP, and XVECLEN.

static void output_peephole2_scratches ( rtx )

static

static void output_peephole2_scratches ( )

static

Generate code to invoke find_free_register () as needed for the scratch registers used by the peephole2 pattern in SPLIT.

static void print_code ( RTX_CODE )

static

static void print_code ( )

static

Variable Documentation

struct clobber_pat * clobber_list

Referenced by gen_insn(), and output_add_clobbers().

int insn_code_number

static

This file is part of GCC.

GCC 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 3, or (at your option) any later version.

GCC 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 COPYING3. If not see http://www.gnu.org/licenses/.

Referenced by gen_insn().

int insn_index_number

static

Data Structures

Functions

Variables

Function Documentation

Variable Documentation