/* Convert RTL to assembler code and output it, for GNU compiler. Copyright (C) 1987, 1988 Free Software Foundation, Inc. This file is part of GNU CC. GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY. No author or distributor accepts responsibility to anyone for the consequences of using it or for whether it serves any particular purpose or works at all, unless he says so in writing. Refer to the GNU CC General Public License for full details. Everyone is granted permission to copy, modify and redistribute GNU CC, but only under the conditions described in the GNU CC General Public License. A copy of this license is supposed to have been given to you along with GNU CC so you can know your rights and responsibilities. It should be in a file named COPYING. Among other things, the copyright notice and this notice must be preserved on all copies. */ /* This is the final pass of the compiler. It looks at the rtl code for a function and outputs assembler code. Call `final_start_function' to output the assembler code for function entry, `final' to output assembler code for some RTL code, `final_end_function' to output assembler code for function exit. If a function is compiled in several pieces, each piece is output separately with `final'. Some optimizations are also done at this level. Move instructions that were made unnecessary by good register allocation are detected and omitted from the output. (Though most of these are removed by the last jump pass.) Instructions to set the condition codes are omitted when it can be seen that the condition codes already had the desired values. In some cases it is sufficient if the inherited condition codes have related values, but this may require the following insn (the one that tests the condition codes) to be modified. The code for the function prologue and epilogue are generated directly as assembler code by the macros FUNCTION_PROLOGUE and FUNCTION_EPILOGUE. Those instructions never exist as rtl. */ #include <stdio.h> #include "config.h" #include "rtl.h" #include "regs.h" #include "insn-config.h" #include "recog.h" #include "conditions.h" #include "gdbfiles.h" /* Get N_SLINE and N_SOL from stab.h if we can expect the file to exist. */ #ifndef NO_DBX_FORMAT #include <stab.h> #endif /* .stabd code for line number. */ #ifndef N_SLINE #define N_SLINE 0x44 #endif /* .stabs code for included file name. */ #ifndef N_SOL #define N_SOL 0x84 #endif #define min(A,B) ((A) < (B) ? (A) : (B)) void output_asm_insn (); static void alter_subreg (); static int alter_cond (); void output_asm_label (); static void output_operand (); void output_address (); void output_addr_const (); static void output_source_line (); static char *reg_name[] = REGISTER_NAMES; /* File in which assembler code is being written. */ extern FILE *asm_out_file; /* All the symbol-blocks (levels of scoping) in the compilation are assigned sequence numbers in order of appearance of the beginnings of the symbol-blocks. Both final and dbxout do this, and assume that they will both give the same number to each block. Final uses these sequence numbers to generate assembler label names LBBnnn and LBEnnn for the beginning and end of the symbol-block. Dbxout uses the sequence nunbers to generate references to the same labels from the dbx debugging information. */ static next_block_index; /* Chain of all `struct gdbfile's. */ struct gdbfile *gdbfiles; /* `struct gdbfile' for the last file we wrote a line number for. */ static struct gdbfile *current_gdbfile; /* Filenum to assign to the next distinct source file encountered. */ static int next_gdb_filenum; /* This variable contains machine-dependent flags (defined in tm-...h) set and examined by output routines that describe how to interpret the condition codes properly. */ CC_STATUS cc_status; /* During output of an insn, this contains a copy of cc_status from before the insn. */ CC_STATUS cc_prev_status; /* Last source file name mentioned in a NOTE insn. */ static char *lastfile; /* Indexed by hardware reg number, is 1 if that register is ever used in the current function. In life_analysis, or in stupid_life_analysis, this is set up to record the hard regs used explicitly. Reload adds in the hard regs used for holding pseudo regs. Final uses it to generate the code in the function prologue and epilogue to save and restore registers as needed. */ char regs_ever_live[FIRST_PSEUDO_REGISTER]; /* Nonzero means current function must be given a frame pointer. Set in stmt.c if anything is allocated on the stack there. Set in reload1.c if anything is allocated on the stack there. */ int frame_pointer_needed; /* Assign unique numbers to labels generated for profiling. */ int profile_label_no; /* Length so far allocated in PENDING_BLOCKS. */ static int max_block_depth; /* Stack of sequence numbers of symbol-blocks of which we have seen the beginning but not yet the end. Sequence numbers are assigned at the beginning; this stack allows us to find the sequence number of a block that is ending. */ static int *pending_blocks; /* Number of elements currently in use in PENDING_BLOCKS. */ static int block_depth; /* Nonzero if have enabled APP processing of our assembler output. */ static int app_on; /* Initialize data in final at the beginning of a compilation. */ void init_final (filename) char *filename; { next_block_index = 2; lastfile = filename; app_on = 0; max_block_depth = 20; pending_blocks = (int *) xmalloc (20 * sizeof *pending_blocks); gdbfiles = 0; next_gdb_filenum = 0; } /* Enable APP processing of subsequent output. Used before the output from an `asm' statement. */ void app_enable () { if (! app_on) { fprintf (asm_out_file, ASM_APP_ON); app_on = 1; } } /* Enable APP processing of subsequent output. Called from varasm.c before most kinds of output. */ void app_disable () { if (app_on) { fprintf (asm_out_file, ASM_APP_OFF); app_on = 0; } } /* Output assembler code for the start of a function, and initialize some of the variables in this file for the new function. The label for the function and associated assembler pseudo-ops have already been output in `assemble_function'. FIRST is the first insn of the rtl for the function being compiled. FILE is the file to write assembler code to. WRITE_SYMBOLS is 1 for gdb symbols, 2 for dbx symbols. OPTIMIZE is nonzero if we should eliminate redundant test and compare insns. */ void final_start_function (first, file, write_symbols, optimize) rtx first; FILE *file; int write_symbols; int optimize; { extern int profile_flag; init_recog (); block_depth = 0; /* Record beginning of the symbol-block that's the entire function. */ if (write_symbols == 1) { pending_blocks[block_depth++] = next_block_index; fprintf (file, "\t.gdbbeg %d\n", next_block_index++); } /* Initial line number is supposed to be output before the function's prologue and label so that the function's address will not appear to be in the last statement of the preceding function. */ if (NOTE_LINE_NUMBER (first) != NOTE_INSN_DELETED) output_source_line (file, first, write_symbols); #ifdef FUNCTION_PROLOGUE /* First output the function prologue: code to set up the stack frame. */ FUNCTION_PROLOGUE (file, get_frame_size ()); #endif if (profile_flag) { int align = min (BIGGEST_ALIGNMENT, BITS_PER_WORD); fprintf (file, "\t%s\n", DATA_SECTION_ASM_OP); ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT)); ASM_OUTPUT_INTERNAL_LABEL (file, "LP", profile_label_no); assemble_integer_zero (); fprintf (file, "\t%s\n", TEXT_SECTION_ASM_OP); FUNCTION_PROFILER (file, profile_label_no); profile_label_no++; } CC_STATUS_INIT; } /* Output assembler code for the end of a function. For clarity, args are same as those of `final_start_function' even though not all of them are needed. */ void final_end_function (first, file, write_symbols, optimize) rtx first; FILE *file; int write_symbols; int optimize; { if (app_on) { fprintf (file, ASM_APP_OFF); app_on = 0; } if (write_symbols == 1) fprintf (file, "\t.gdbend %d\n", pending_blocks[0]); #ifdef FUNCTION_EPILOGUE /* Finally, output the function epilogue: code to restore the stack frame and return to the caller. */ FUNCTION_EPILOGUE (file, get_frame_size ()); #endif /* If FUNCTION_EPILOGUE is not defined, then the function body itself contains return instructions wherever needed. */ } /* Output assembler code for some insns: all or part of a function. For description of args, see `final_start_function', above. */ void final (first, file, write_symbols, optimize) rtx first; FILE *file; int write_symbols; int optimize; { register rtx insn; register int i; for (insn = NEXT_INSN (first); insn; insn = NEXT_INSN (insn)) { switch (GET_CODE (insn)) { case NOTE: if (! write_symbols) break; if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG) abort (); /* Obsolete; shouldn't appear */ if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG || NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END) break; if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED) break; /* An insn that was "deleted" */ if (app_on) { fprintf (file, ASM_APP_OFF); app_on = 0; } if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) { /* Beginning of a symbol-block. Assign it a sequence number and push the number onto the stack PENDING_BLOCKS. */ if (block_depth == max_block_depth) { /* PENDING_BLOCKS is full; make it longer. */ max_block_depth *= 2; pending_blocks = (int *) xrealloc (pending_blocks, max_block_depth * sizeof (int)); } pending_blocks[block_depth++] = next_block_index; /* Output debugging info about the symbol-block beginning. */ if (write_symbols == 2) ASM_OUTPUT_INTERNAL_LABEL (file, "LBB", next_block_index); else fprintf (file, "\t.gdbbeg %d\n", next_block_index); next_block_index++; } else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) { /* End of a symbol-block. Pop its sequence number off PENDING_BLOCKS and output debugging info based on that. */ if (write_symbols == 2) { if (block_depth > 0) ASM_OUTPUT_INTERNAL_LABEL (file, "LBE", pending_blocks[--block_depth]); } else fprintf (file, "\t.gdbend %d\n", pending_blocks[--block_depth]); } else if (NOTE_LINE_NUMBER (insn) > 0) /* This note is a line-number. */ output_source_line (file, insn, write_symbols); break; case BARRIER: break; case CODE_LABEL: if (app_on) { fprintf (file, ASM_APP_OFF); app_on = 0; } #ifdef ASM_OUTPUT_CASE_LABEL if (NEXT_INSN (insn) != 0 && GET_CODE (NEXT_INSN (insn)) == JUMP_INSN) { rtx nextbody = PATTERN (NEXT_INSN (insn)); /* If this label is followed by a jump-table, output the two of them together in a special way. */ if (GET_CODE (nextbody) == ADDR_VEC || GET_CODE (nextbody) == ADDR_DIFF_VEC) { ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn), NEXT_INSN (insn)); break; } } #endif ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn)); CC_STATUS_INIT; break; default: { register rtx body = PATTERN (insn); int insn_code_number; char *template; /* An INSN, JUMP_INSN or CALL_INSN. First check for special kinds that recog doesn't recognize. */ if (GET_CODE (body) == USE /* These are just declarations */ || GET_CODE (body) == CLOBBER) break; if (GET_CODE (body) == ASM_INPUT) { if (! app_on) { fprintf (file, ASM_APP_ON); app_on = 1; } fprintf (asm_out_file, "\t%s\n", XSTR (body, 0)); /* There's no telling what that did to the condition codes. */ CC_STATUS_INIT; break; } /* Detect `asm' construct with operands. */ if (asm_noperands (body) > 0) { int noperands = asm_noperands (body); rtx *ops = (rtx *) malloc (noperands * sizeof (rtx)); char *string; if (! app_on) { fprintf (file, ASM_APP_ON); app_on = 1; } /* Get out the operand values. */ string = decode_asm_operands (body, ops, 0, 0, 0); /* Output the insn using them. */ output_asm_insn (string, ops); /* There's no telling what that did to the condition codes. */ CC_STATUS_INIT; break; } if (app_on) { fprintf (file, ASM_APP_OFF); app_on = 0; } /* Detect insns that are really jump-tables and output them as such. */ if (GET_CODE (body) == ADDR_VEC) { enum machine_mode mode = GET_MODE (body); register int vlen, idx; vlen = XVECLEN (body, 0); for (idx = 0; idx < vlen; idx++) ASM_OUTPUT_ADDR_VEC_ELT (file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 0, idx), 0))); break; } if (GET_CODE (body) == ADDR_DIFF_VEC) { enum machine_mode mode = GET_MODE (body); register int vlen, idx; vlen = XVECLEN (body, 1); for (idx = 0; idx < vlen; idx++) ASM_OUTPUT_ADDR_DIFF_ELT (file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 1, idx), 0)), CODE_LABEL_NUMBER (XEXP (XEXP (body, 0), 0))); break; } /* We have a real machine instruction as rtl. */ body = PATTERN (insn); /* Check for redundant move insns moving a reg into itself. This takes little time and does not affect the semantics so we do it even when `optimize' is 0. It is not safe to do this for memory references; we would not know if they were volatile. */ if (GET_CODE (body) == SET && SET_DEST (body) == SET_SRC (body) && GET_CODE (SET_DEST (body)) == REG) break; /* Check for redundant test and compare instructions (when the condition codes are already set up as desired). This is done only when optimizing; if not optimizing, it should be possible for the user to alter a variable with the debugger in between statements and the next statement should reexamine the variable to compute the condition codes. */ if (optimize && GET_CODE (body) == SET && GET_CODE (SET_DEST (body)) == CC0) { if (GET_CODE (SET_SRC (body)) == SUBREG) alter_subreg (SET_SRC (body)); if ((cc_status.value1 != 0 && rtx_equal_p (SET_SRC (body), cc_status.value1)) || (cc_status.value2 != 0 && rtx_equal_p (SET_SRC (body), cc_status.value2))) { /* Don't delete insn if has an addressing side-effect */ if (! find_reg_note (insn, REG_INC, 0)) break; } } /* If this is a conditional branch, maybe modify it if the cc's are in a nonstandard state so that it accomplishes the same thing that it would do straightforwardly if the cc's were set up normally. */ if (cc_status.flags != 0 && GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == SET && SET_DEST (body) == pc_rtx && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE) { /* This function may alter the contents of its argument and clear some of the cc_status.flags bits. It may also return 1 meaning condition now always true or -1 meaning condition now always false or 2 meaning condition nontrivial but altered. */ register int result = alter_cond (XEXP (SET_SRC (body), 0)); /* If condition now has fixed value, replace the IF_THEN_ELSE with its then-operand or its else-operand. */ if (result == 1) SET_SRC (body) = XEXP (SET_SRC (body), 1); if (result == -1) SET_SRC (body) = XEXP (SET_SRC (body), 2); /* The jump is now either unconditional or a no-op. If it has become a no-op, don't try to output it. (It would not be recognized.) */ if (SET_SRC (body) == pc_rtx) continue; /* Rerecognize the instruction if it has changed. */ if (result != 0) INSN_CODE (insn) = -1; } /* Make same adjustments to instructions that examine the condition codes without jumping. */ if (cc_status.flags != 0 && GET_CODE (body) == SET) switch (GET_CODE (SET_SRC (body))) { case GTU: case GT: case LTU: case LT: case GEU: case GE: case LEU: case LE: case EQ: case NE: { register int result = alter_cond (SET_SRC (body)); if (result == 1) SET_SRC (body) = gen_rtx (CONST_INT, VOIDmode, -1); if (result == -1) SET_SRC (body) = const0_rtx; if (result != 0) INSN_CODE (insn) = -1; } } /* Try to recognize the instruction. If successful, verify that the operands satisfy the constraints for the instruction. Crash if they don't, since `reload' should have changed them so that they do. */ insn_code_number = recog_memoized (insn); insn_extract (insn); for (i = 0; i < insn_n_operands[insn_code_number]; i++) if (GET_CODE (recog_operand[i]) == SUBREG) alter_subreg (recog_operand[i]); #ifdef REGISTER_CONSTRAINTS if (! constrain_operands (insn_code_number)) abort (); #endif cc_prev_status = cc_status; /* Update `cc_status' for this instruction. The instruction's output routine may change it further. This should be a no-op for jump instructions because their output routines may need to examine `cc_status', below. That's ok since jump insns don't normally alter the condition codes. */ NOTICE_UPDATE_CC (body); /* If the proper template needs to be chosen by some C code, run that code and get the real template. */ template = insn_template[insn_code_number]; if (template == 0) template = insn_outfun[insn_code_number] (recog_operand, insn); /* Output assembler code from the template. */ output_asm_insn (template, recog_operand); } } } } /* Set up FILENAME as the current file for GDB line-number output. */ void set_current_gdbfile (filename) char *filename; { register struct gdbfile *f; for (f = gdbfiles; f; f = f->next) if (!strcmp (f->name, filename)) break; if (!f) { f = (struct gdbfile *) permalloc (sizeof (struct gdbfile)); f->next = gdbfiles; gdbfiles = f; f->name = filename; f->filenum = next_gdb_filenum++; f->nlines = 0; } current_gdbfile = f; lastfile = filename; } /* Output debugging info to the assembler file FILE based on the NOTE-insn INSN, assumed to be a line number. */ static void output_source_line (file, insn, write_symbols) FILE *file; rtx insn; int write_symbols; { register char *filename = NOTE_SOURCE_FILE (insn); if (write_symbols == 1) { /* Output GDB-format line number info. */ /* If this is not the same source file as last time, find or assign a GDB-file-number to this file. */ if (filename && (lastfile == 0 || strcmp (filename, lastfile) || current_gdbfile == 0)) set_current_gdbfile (filename); ++current_gdbfile->nlines; fprintf (file, "\t.gdbline %d,%d\n", current_gdbfile->filenum, NOTE_LINE_NUMBER (insn)); } else { /* Write DBX line number data. */ if (filename && (lastfile == 0 || strcmp (filename, lastfile))) #ifdef ASM_OUTPUT_SOURCE_FILENAME ASM_OUTPUT_SOURCE_FILENAME (file, filename); #else fprintf (file, "\t.stabs \"%s\",%d,0,0,Ltext\n", filename, N_SOL); #endif lastfile = filename; #ifdef ASM_OUTPUT_SOURCE_LINE ASM_OUTPUT_SOURCE_LINE (file, NOTE_LINE_NUMBER (insn)); #else fprintf (file, "\t.stabd %d,0,%d\n", N_SLINE, NOTE_LINE_NUMBER (insn)); #endif } } /* If X is a SUBREG, replace it with a REG or a MEM, based on the thing it is a subreg of. */ static void alter_subreg (x) register rtx x; { register rtx y = SUBREG_REG (x); if (GET_CODE (y) == SUBREG) alter_subreg (y); if (GET_CODE (y) == REG) { /* If the containing reg really gets a hard reg, so do we. */ PUT_CODE (x, REG); REGNO (x) = REGNO (y) + SUBREG_WORD (x); } else if (GET_CODE (y) == MEM) { register int offset = SUBREG_WORD (x) * UNITS_PER_WORD; #ifdef BYTES_BIG_ENDIAN offset -= (min (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))) - min (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (y)))); #endif PUT_CODE (x, MEM); XEXP (x, 0) = plus_constant (XEXP (y, 0), offset); } } /* Do alter_subreg on all the SUBREGs contained in X. */ static rtx walk_alter_subreg (x) rtx x; { switch (GET_CODE (x)) { case PLUS: case MULT: XEXP (x, 0) = walk_alter_subreg (XEXP (x, 0)); XEXP (x, 1) = walk_alter_subreg (XEXP (x, 1)); break; case MEM: XEXP (x, 0) = walk_alter_subreg (XEXP (x, 0)); break; case SUBREG: alter_subreg (x); } return x; } /* Given BODY, the body of a jump instruction, alter the jump condition as required by the bits that are set in cc_status.flags. Not all of the bits there can be handled at this level in all cases. The bits that are taken care of here are cleared. The value is normally 0. In this case, COND itself has usually been altered. 1 means that the condition has become always true. -1 means that the condition has become always false. */ static int alter_cond (cond) register rtx cond; { int value = 0; if (cc_status.flags & CC_REVERSED) { value = 2; switch (GET_CODE (cond)) { case LE: PUT_CODE (cond, GE); break; case GE: PUT_CODE (cond, LE); break; case LT: PUT_CODE (cond, GT); break; case GT: PUT_CODE (cond, LT); break; case LEU: PUT_CODE (cond, GEU); break; case GEU: PUT_CODE (cond, LEU); break; case LTU: PUT_CODE (cond, GTU); break; case GTU: PUT_CODE (cond, LTU); break; } } if (cond != 0 && cc_status.flags & CC_NOT_POSITIVE) switch (GET_CODE (cond)) { case LE: case LEU: case GEU: /* Jump becomes unconditional. */ return 1; case GT: case GTU: case LTU: /* Jump becomes no-op. */ return -1; case GE: PUT_CODE (cond, EQ); value = 2; break; case LT: PUT_CODE (cond, NE); value = 2; break; } if (cond != 0 && cc_status.flags & CC_NOT_NEGATIVE) switch (GET_CODE (cond)) { case GE: case GEU: /* Jump becomes unconditional. */ return 1; case LT: case LTU: /* Jump becomes no-op. */ return -1; case LE: case LEU: PUT_CODE (cond, EQ); value = 2; break; case GT: case GTU: PUT_CODE (cond, NE); value = 2; break; } if (cond != 0 && cc_status.flags & CC_NO_OVERFLOW) switch (GET_CODE (cond)) { case GEU: /* Jump becomes unconditional. */ return 1; case LEU: PUT_CODE (cond, EQ); value = 2; break; case GTU: PUT_CODE (cond, NE); value = 2; break; case LTU: /* Jump becomes no-op. */ return -1; } return value; } /* Output of assembler code from a template, and its subroutines. */ /* Output text from TEMPLATE to the assembler output file, obeying %-directions to substitute operands taken from the vector OPERANDS. %N (for N a digit) means print operand N in usual manner. %lN means require operand N to be a CODE_LABEL or LABEL_REF and print the label name with no punctuation. %cN means require operand N to be a constant and print the constant expression with no punctuation. %aN means expect operand N to be a memory address (not a memory reference!) and print a reference to that address. %nN means expect operand N to be a constant and print a constant expression for minus the value of the operand, with no other punctuation. */ void output_asm_insn (template, operands) char *template; rtx *operands; { register char *p; register int c; /* An insn may return a null string template in a case where no assembler code is needed. */ if (*template == 0) return; p = template; putc ('\t', asm_out_file); #ifdef ASM_OUTPUT_OPCODE ASM_OUTPUT_OPCODE (asm_out_file, p); #endif while (c = *p++) { #ifdef ASM_OUTPUT_OPCODE if (c == '\n') { putc (c, asm_out_file); while ((c = *p) == '\t') { putc (c, asm_out_file); p++; } ASM_OUTPUT_OPCODE (asm_out_file, p); } else #endif if (c != '%') putc (c, asm_out_file); else { /* %% outputs a single %. */ if (*p == '%') { p++; putc (c, asm_out_file); } /* % followed by a letter and some digits outputs an operand in a special way depending on the letter. Letters `acln' are implemented here. Other letters are passed to `output_operand' so that the PRINT_OPERAND macro can define them. */ else if ((*p >= 'a' && *p <= 'z') || (*p >= 'A' && *p <= 'Z')) { int letter = *p++; c = atoi (p); if (letter == 'l') output_asm_label (operands[c]); else if (letter == 'a') output_address (operands[c]); else if (letter == 'c') { if (CONSTANT_ADDRESS_P (operands[c])) output_addr_const (asm_out_file, operands[c]); else output_operand (operands[c], 'c'); } else if (letter == 'n') { if (GET_CODE (operands[c]) == CONST_INT) fprintf (asm_out_file, "%d", - INTVAL (operands[c])); else { putc ('-', asm_out_file); output_addr_const (asm_out_file, operands[c]); } } else if (*p >= '0' && *p <= '9') output_operand (operands[c], letter); else /* No operand-number follows the letter. */ output_operand (0, letter); while ((c = *p) >= '0' && c <= '9') p++; } /* % followed by a digit outputs an operand the default way. */ else if (*p >= '0' && *p <= '9') { c = atoi (p); output_operand (operands[c], 0); while ((c = *p) >= '0' && c <= '9') p++; } /* % followed by punctuation: output something for that punctuation character alone, with no operand. The PRINT_OPERAND macro decides what is actually done. */ else output_operand (0, *p++); } } putc ('\n', asm_out_file); } /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */ void output_asm_label (x) rtx x; { char buf[20]; if (GET_CODE (x) == LABEL_REF) ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0))); else if (GET_CODE (x) == CODE_LABEL) ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x)); else abort (); assemble_name (asm_out_file, buf); } /* Print operand X using machine-dependent assembler syntax. The macro PRINT_OPERAND is defined just to control this function. CODE is a non-digit that preceded the operand-number in the % spec, such as 'z' if the spec was `%z3'. CODE is 0 if there was no char between the % and the digits. When CODE is a non-letter, X is 0. The meanings of the letters are machine-dependent and controlled by PRINT_OPERAND. */ static void output_operand (x, code) rtx x; int code; { if (x && GET_CODE (x) == SUBREG) alter_subreg (x); PRINT_OPERAND (asm_out_file, x, code); } /* Print a memory reference operand for address X using machine-dependent assembler syntax. The macro PRINT_OPERAND_ADDRESS exists just to control this function. */ void output_address (x) rtx x; { walk_alter_subreg (x); PRINT_OPERAND_ADDRESS (asm_out_file, x); } /* Print an integer constant expression in assembler syntax. Addition and subtraction are the only arithmetic that may appear in these expressions. */ void output_addr_const (file, x) FILE *file; rtx x; { char buf[20]; restart: switch (GET_CODE (x)) { case SYMBOL_REF: assemble_name (file, XSTR (x, 0)); break; case LABEL_REF: ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0))); assemble_name (asm_out_file, buf); break; case CODE_LABEL: ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x)); assemble_name (asm_out_file, buf); break; case CONST_INT: fprintf (file, "%d", INTVAL (x)); break; case CONST: x = XEXP (x, 0); goto restart; case PLUS: output_addr_const (file, XEXP (x, 0)); fprintf (file, "+"); output_addr_const (file, XEXP (x, 1)); break; case MINUS: output_addr_const (file, XEXP (x, 0)); fprintf (file, "-"); output_addr_const (file, XEXP (x, 1)); break; default: abort (); } }