diff options
Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/dwarf2asm.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/dwarf2asm.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/dwarf2asm.c b/gcc-4.2.1-5666.3/gcc/dwarf2asm.c new file mode 100644 index 000000000..59c5e29c2 --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/dwarf2asm.c @@ -0,0 +1,887 @@ +/* Dwarf2 assembler output helper routines. + Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + +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 2, 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 COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tm.h" +#include "flags.h" +#include "tree.h" +#include "rtl.h" +#include "output.h" +#include "target.h" +#include "dwarf2asm.h" +#include "dwarf2.h" +#include "splay-tree.h" +#include "ggc.h" +#include "tm_p.h" + + +/* How to start an assembler comment. */ +#ifndef ASM_COMMENT_START +#define ASM_COMMENT_START ";#" +#endif + + +/* Output an unaligned integer with the given value and size. Prefer not + to print a newline, since the caller may want to add a comment. */ + +void +dw2_assemble_integer (int size, rtx x) +{ + const char *op = integer_asm_op (size, FALSE); + + if (op) + { + fputs (op, asm_out_file); + if (GET_CODE (x) == CONST_INT) + fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, INTVAL (x)); + else + output_addr_const (asm_out_file, x); + } + else + assemble_integer (x, size, BITS_PER_UNIT, 1); +} + + +/* Output an immediate constant in a given size. */ + +void +dw2_asm_output_data (int size, unsigned HOST_WIDE_INT value, + const char *comment, ...) +{ + va_list ap; + const char *op = integer_asm_op (size, FALSE); + + va_start (ap, comment); + + if (size * 8 < HOST_BITS_PER_WIDE_INT) + value &= ~(~(unsigned HOST_WIDE_INT) 0 << (size * 8)); + + if (op) + fprintf (asm_out_file, "%s" HOST_WIDE_INT_PRINT_HEX, op, value); + else + assemble_integer (GEN_INT (value), size, BITS_PER_UNIT, 1); + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +/* Output the difference between two symbols in a given size. */ +/* ??? There appear to be assemblers that do not like such + subtraction, but do support ASM_SET_OP. It's unfortunately + impossible to do here, since the ASM_SET_OP for the difference + symbol must appear after both symbols are defined. */ + +void +dw2_asm_output_delta (int size, const char *lab1, const char *lab2, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef ASM_OUTPUT_DWARF_DELTA + ASM_OUTPUT_DWARF_DELTA (asm_out_file, size, lab1, lab2); +#else + dw2_assemble_integer (size, + gen_rtx_MINUS (Pmode, + gen_rtx_SYMBOL_REF (Pmode, lab1), + gen_rtx_SYMBOL_REF (Pmode, lab2))); +#endif + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +/* Output a section-relative reference to a LABEL, which was placed in + BASE. In general this can only be done for debugging symbols. + E.g. on most targets with the GNU linker, this is accomplished with + a direct reference and the knowledge that the debugging section + will be placed at VMA 0. Some targets have special relocations for + this that we must use. */ + +void +dw2_asm_output_offset (int size, const char *label, + section *base ATTRIBUTE_UNUSED, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef ASM_OUTPUT_DWARF_OFFSET + ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, base); +#else + dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label)); +#endif + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +#if 0 + +/* Output a self-relative reference to a label, possibly in a + different section or object file. */ + +void +dw2_asm_output_pcrel (int size ATTRIBUTE_UNUSED, + const char *label ATTRIBUTE_UNUSED, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef ASM_OUTPUT_DWARF_PCREL + ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label); +#else + dw2_assemble_integer (size, + gen_rtx_MINUS (Pmode, + gen_rtx_SYMBOL_REF (Pmode, label), + pc_rtx)); +#endif + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} +#endif /* 0 */ + +/* Output an absolute reference to a label. */ + +void +dw2_asm_output_addr (int size, const char *label, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + + dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label)); + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +/* Similar, but use an RTX expression instead of a text label. */ + +void +dw2_asm_output_addr_rtx (int size, rtx addr, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + + dw2_assemble_integer (size, addr); + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +/* Output the first ORIG_LEN characters of STR as a string. + If ORIG_LEN is equal to -1, ignore this parameter and output + the entire STR instead. + If COMMENT is not NULL and comments in the debug information + have been requested by the user, append the given COMMENT + to the generated output. */ + +void +dw2_asm_output_nstring (const char *str, size_t orig_len, + const char *comment, ...) +{ + size_t i, len; + va_list ap; + + va_start (ap, comment); + + len = orig_len; + + if (len == (size_t) -1) + len = strlen (str); + + if (flag_debug_asm && comment) + { + fputs ("\t.ascii \"", asm_out_file); + for (i = 0; i < len; i++) + { + int c = str[i]; + if (c == '\"' || c == '\\') + fputc ('\\', asm_out_file); + if (ISPRINT(c)) + fputc (c, asm_out_file); + else + fprintf (asm_out_file, "\\%o", c); + } + fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + fputc ('\n', asm_out_file); + } + else + { + /* If an explicit length was given, we can't assume there + is a null termination in the string buffer. */ + if (orig_len == (size_t) -1) + len += 1; + ASM_OUTPUT_ASCII (asm_out_file, str, len); + if (orig_len != (size_t) -1) + assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1); + } + + va_end (ap); +} + + +/* Return the size of an unsigned LEB128 quantity. */ + +int +size_of_uleb128 (unsigned HOST_WIDE_INT value) +{ + int size = 0; + + do + { + value >>= 7; + size += 1; + } + while (value != 0); + + return size; +} + +/* Return the size of a signed LEB128 quantity. */ + +int +size_of_sleb128 (HOST_WIDE_INT value) +{ + int size = 0, byte; + + do + { + byte = (value & 0x7f); + value >>= 7; + size += 1; + } + while (!((value == 0 && (byte & 0x40) == 0) + || (value == -1 && (byte & 0x40) != 0))); + + return size; +} + +/* Given an encoding, return the number of bytes the format occupies. + This is only defined for fixed-size encodings, and so does not + include leb128. */ + +int +size_of_encoded_value (int encoding) +{ + if (encoding == DW_EH_PE_omit) + return 0; + + switch (encoding & 0x07) + { + case DW_EH_PE_absptr: + return POINTER_SIZE / BITS_PER_UNIT; + case DW_EH_PE_udata2: + return 2; + case DW_EH_PE_udata4: + return 4; + case DW_EH_PE_udata8: + return 8; + default: + gcc_unreachable (); + } +} + +/* Yield a name for a given pointer encoding. */ + +const char * +eh_data_format_name (int format) +{ +#if HAVE_DESIGNATED_INITIALIZERS +#define S(p, v) [p] = v, +#else +#define S(p, v) case p: return v; +#endif + +#if HAVE_DESIGNATED_INITIALIZERS + __extension__ static const char * const format_names[256] = { +#else + switch (format) { +#endif + + S(DW_EH_PE_absptr, "absolute") + S(DW_EH_PE_omit, "omit") + S(DW_EH_PE_aligned, "aligned absolute") + + S(DW_EH_PE_uleb128, "uleb128") + S(DW_EH_PE_udata2, "udata2") + S(DW_EH_PE_udata4, "udata4") + S(DW_EH_PE_udata8, "udata8") + S(DW_EH_PE_sleb128, "sleb128") + S(DW_EH_PE_sdata2, "sdata2") + S(DW_EH_PE_sdata4, "sdata4") + S(DW_EH_PE_sdata8, "sdata8") + + S(DW_EH_PE_absptr | DW_EH_PE_pcrel, "pcrel") + S(DW_EH_PE_uleb128 | DW_EH_PE_pcrel, "pcrel uleb128") + S(DW_EH_PE_udata2 | DW_EH_PE_pcrel, "pcrel udata2") + S(DW_EH_PE_udata4 | DW_EH_PE_pcrel, "pcrel udata4") + S(DW_EH_PE_udata8 | DW_EH_PE_pcrel, "pcrel udata8") + S(DW_EH_PE_sleb128 | DW_EH_PE_pcrel, "pcrel sleb128") + S(DW_EH_PE_sdata2 | DW_EH_PE_pcrel, "pcrel sdata2") + S(DW_EH_PE_sdata4 | DW_EH_PE_pcrel, "pcrel sdata4") + S(DW_EH_PE_sdata8 | DW_EH_PE_pcrel, "pcrel sdata8") + + S(DW_EH_PE_absptr | DW_EH_PE_textrel, "textrel") + S(DW_EH_PE_uleb128 | DW_EH_PE_textrel, "textrel uleb128") + S(DW_EH_PE_udata2 | DW_EH_PE_textrel, "textrel udata2") + S(DW_EH_PE_udata4 | DW_EH_PE_textrel, "textrel udata4") + S(DW_EH_PE_udata8 | DW_EH_PE_textrel, "textrel udata8") + S(DW_EH_PE_sleb128 | DW_EH_PE_textrel, "textrel sleb128") + S(DW_EH_PE_sdata2 | DW_EH_PE_textrel, "textrel sdata2") + S(DW_EH_PE_sdata4 | DW_EH_PE_textrel, "textrel sdata4") + S(DW_EH_PE_sdata8 | DW_EH_PE_textrel, "textrel sdata8") + + S(DW_EH_PE_absptr | DW_EH_PE_datarel, "datarel") + S(DW_EH_PE_uleb128 | DW_EH_PE_datarel, "datarel uleb128") + S(DW_EH_PE_udata2 | DW_EH_PE_datarel, "datarel udata2") + S(DW_EH_PE_udata4 | DW_EH_PE_datarel, "datarel udata4") + S(DW_EH_PE_udata8 | DW_EH_PE_datarel, "datarel udata8") + S(DW_EH_PE_sleb128 | DW_EH_PE_datarel, "datarel sleb128") + S(DW_EH_PE_sdata2 | DW_EH_PE_datarel, "datarel sdata2") + S(DW_EH_PE_sdata4 | DW_EH_PE_datarel, "datarel sdata4") + S(DW_EH_PE_sdata8 | DW_EH_PE_datarel, "datarel sdata8") + + S(DW_EH_PE_absptr | DW_EH_PE_funcrel, "funcrel") + S(DW_EH_PE_uleb128 | DW_EH_PE_funcrel, "funcrel uleb128") + S(DW_EH_PE_udata2 | DW_EH_PE_funcrel, "funcrel udata2") + S(DW_EH_PE_udata4 | DW_EH_PE_funcrel, "funcrel udata4") + S(DW_EH_PE_udata8 | DW_EH_PE_funcrel, "funcrel udata8") + S(DW_EH_PE_sleb128 | DW_EH_PE_funcrel, "funcrel sleb128") + S(DW_EH_PE_sdata2 | DW_EH_PE_funcrel, "funcrel sdata2") + S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4") + S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8") + + S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel, + "indirect pcrel") + S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel, + "indirect pcrel uleb128") + S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_pcrel, + "indirect pcrel udata2") + S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_pcrel, + "indirect pcrel udata4") + S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_pcrel, + "indirect pcrel udata8") + S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_pcrel, + "indirect pcrel sleb128") + S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_pcrel, + "indirect pcrel sdata2") + S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_pcrel, + "indirect pcrel sdata4") + S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_pcrel, + "indirect pcrel sdata8") + + S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_textrel, + "indirect textrel") + S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_textrel, + "indirect textrel uleb128") + S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_textrel, + "indirect textrel udata2") + S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_textrel, + "indirect textrel udata4") + S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_textrel, + "indirect textrel udata8") + S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_textrel, + "indirect textrel sleb128") + S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_textrel, + "indirect textrel sdata2") + S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_textrel, + "indirect textrel sdata4") + S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_textrel, + "indirect textrel sdata8") + + S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_datarel, + "indirect datarel") + S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_datarel, + "indirect datarel uleb128") + S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_datarel, + "indirect datarel udata2") + S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_datarel, + "indirect datarel udata4") + S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_datarel, + "indirect datarel udata8") + S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_datarel, + "indirect datarel sleb128") + S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_datarel, + "indirect datarel sdata2") + S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_datarel, + "indirect datarel sdata4") + S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_datarel, + "indirect datarel sdata8") + + S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_funcrel, + "indirect funcrel") + S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_funcrel, + "indirect funcrel uleb128") + S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_funcrel, + "indirect funcrel udata2") + S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_funcrel, + "indirect funcrel udata4") + S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_funcrel, + "indirect funcrel udata8") + S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_funcrel, + "indirect funcrel sleb128") + S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_funcrel, + "indirect funcrel sdata2") + S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_funcrel, + "indirect funcrel sdata4") + S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_funcrel, + "indirect funcrel sdata8") + +#if HAVE_DESIGNATED_INITIALIZERS + }; + + gcc_assert (format >= 0 && format < 0x100 && format_names[format]); + + return format_names[format]; +#else + } + gcc_unreachable (); +#endif +} + +/* Output an unsigned LEB128 quantity. */ + +void +dw2_asm_output_data_uleb128 (unsigned HOST_WIDE_INT value, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef HAVE_AS_LEB128 + fprintf (asm_out_file, "\t.uleb128 " HOST_WIDE_INT_PRINT_HEX , value); + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } +#else + { + unsigned HOST_WIDE_INT work = value; + const char *byte_op = targetm.asm_out.byte_op; + + if (byte_op) + fputs (byte_op, asm_out_file); + do + { + int byte = (work & 0x7f); + work >>= 7; + if (work != 0) + /* More bytes to follow. */ + byte |= 0x80; + + if (byte_op) + { + fprintf (asm_out_file, "0x%x", byte); + if (work != 0) + fputc (',', asm_out_file); + } + else + assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1); + } + while (work != 0); + + if (flag_debug_asm) + { + fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX, + ASM_COMMENT_START, value); + if (comment) + { + fputs ("; ", asm_out_file); + vfprintf (asm_out_file, comment, ap); + } + } + } +#endif + fputc ('\n', asm_out_file); + + va_end (ap); +} + +/* Output a signed LEB128 quantity. */ + +void +dw2_asm_output_data_sleb128 (HOST_WIDE_INT value, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef HAVE_AS_LEB128 + fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value); + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } +#else + { + HOST_WIDE_INT work = value; + int more, byte; + const char *byte_op = targetm.asm_out.byte_op; + + if (byte_op) + fputs (byte_op, asm_out_file); + do + { + byte = (work & 0x7f); + /* arithmetic shift */ + work >>= 7; + more = !((work == 0 && (byte & 0x40) == 0) + || (work == -1 && (byte & 0x40) != 0)); + if (more) + byte |= 0x80; + + if (byte_op) + { + fprintf (asm_out_file, "0x%x", byte); + if (more) + fputc (',', asm_out_file); + } + else + assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1); + } + while (more); + + if (flag_debug_asm) + { + fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC, + ASM_COMMENT_START, value); + if (comment) + { + fputs ("; ", asm_out_file); + vfprintf (asm_out_file, comment, ap); + } + } + } +#endif + fputc ('\n', asm_out_file); + + va_end (ap); +} + +void +dw2_asm_output_delta_uleb128 (const char *lab1 ATTRIBUTE_UNUSED, + const char *lab2 ATTRIBUTE_UNUSED, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef HAVE_AS_LEB128 + fputs ("\t.uleb128 ", asm_out_file); + assemble_name (asm_out_file, lab1); + fputc ('-', asm_out_file); + assemble_name (asm_out_file, lab2); +#else + gcc_unreachable (); +#endif + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +#if 0 + +void +dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED, + const char *lab2 ATTRIBUTE_UNUSED, + const char *comment, ...) +{ + va_list ap; + + va_start (ap, comment); + +#ifdef HAVE_AS_LEB128 + fputs ("\t.sleb128 ", asm_out_file); + assemble_name (asm_out_file, lab1); + fputc ('-', asm_out_file); + assemble_name (asm_out_file, lab2); +#else + gcc_unreachable (); +#endif + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} +#endif /* 0 */ + +static rtx dw2_force_const_mem (rtx, bool); +static int dw2_output_indirect_constant_1 (splay_tree_node, void *); + +static GTY((param1_is (char *), param2_is (tree))) splay_tree indirect_pool; + +static GTY(()) int dw2_const_labelno; + +#if defined(HAVE_GAS_HIDDEN) && defined(SUPPORTS_ONE_ONLY) +# define USE_LINKONCE_INDIRECT 1 +#else +# define USE_LINKONCE_INDIRECT 0 +#endif + +/* Put X, a SYMBOL_REF, in memory. Return a SYMBOL_REF to the allocated + memory. Differs from force_const_mem in that a single pool is used for + the entire unit of translation, and the memory is not guaranteed to be + "near" the function in any interesting sense. PUBLIC controls whether + the symbol can be shared across the entire application (or DSO). */ + +static rtx +dw2_force_const_mem (rtx x, bool public) +{ + splay_tree_node node; + const char *str; + tree decl; + + if (! indirect_pool) + indirect_pool = splay_tree_new_ggc (splay_tree_compare_pointers); + + gcc_assert (GET_CODE (x) == SYMBOL_REF); + + str = targetm.strip_name_encoding (XSTR (x, 0)); + node = splay_tree_lookup (indirect_pool, (splay_tree_key) str); + if (node) + decl = (tree) node->value; + else + { + tree id; + + if (public && USE_LINKONCE_INDIRECT) + { + char *ref_name = alloca (strlen (str) + sizeof "DW.ref."); + + sprintf (ref_name, "DW.ref.%s", str); + id = get_identifier (ref_name); + decl = build_decl (VAR_DECL, id, ptr_type_node); + DECL_ARTIFICIAL (decl) = 1; + DECL_IGNORED_P (decl) = 1; + TREE_PUBLIC (decl) = 1; + DECL_INITIAL (decl) = decl; + make_decl_one_only (decl); + } + else + { + char label[32]; + + ASM_GENERATE_INTERNAL_LABEL (label, "LDFCM", dw2_const_labelno); + ++dw2_const_labelno; + id = get_identifier (label); + decl = build_decl (VAR_DECL, id, ptr_type_node); + DECL_ARTIFICIAL (decl) = 1; + DECL_IGNORED_P (decl) = 1; + TREE_STATIC (decl) = 1; + DECL_INITIAL (decl) = decl; + } + + id = maybe_get_identifier (str); + if (id) + TREE_SYMBOL_REFERENCED (id) = 1; + + splay_tree_insert (indirect_pool, (splay_tree_key) str, + (splay_tree_value) decl); + } + + return XEXP (DECL_RTL (decl), 0); +} + +/* A helper function for dw2_output_indirect_constants called through + splay_tree_foreach. Emit one queued constant to memory. */ + +static int +dw2_output_indirect_constant_1 (splay_tree_node node, + void *data ATTRIBUTE_UNUSED) +{ + const char *sym; + rtx sym_ref; + tree decl; + + sym = (const char *) node->key; + decl = (tree) node->value; + sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym); + if (TREE_PUBLIC (decl) && USE_LINKONCE_INDIRECT) + fprintf (asm_out_file, "\t.hidden %sDW.ref.%s\n", user_label_prefix, sym); + assemble_variable (decl, 1, 1, 1); + assemble_integer (sym_ref, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); + + return 0; +} + +/* Emit the constants queued through dw2_force_const_mem. */ + +void +dw2_output_indirect_constants (void) +{ + if (indirect_pool) + splay_tree_foreach (indirect_pool, dw2_output_indirect_constant_1, NULL); +} + +/* Like dw2_asm_output_addr_rtx, but encode the pointer as directed. + If PUBLIC is set and the encoding is DW_EH_PE_indirect, the indirect + reference is shared across the entire application (or DSO). */ + +void +dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr, bool public, + const char *comment, ...) +{ + int size; + va_list ap; + + va_start (ap, comment); + + size = size_of_encoded_value (encoding); + + if (encoding == DW_EH_PE_aligned) + { + assemble_align (POINTER_SIZE); + assemble_integer (addr, size, POINTER_SIZE, 1); + return; + } + + /* NULL is _always_ represented as a plain zero, as is 1 for Ada's + "all others". */ + if (addr == const0_rtx || addr == const1_rtx) + assemble_integer (addr, size, BITS_PER_UNIT, 1); + else + { + restart: + /* Allow the target first crack at emitting this. Some of the + special relocations require special directives instead of + just ".4byte" or whatever. */ +#ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX + ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX (asm_out_file, encoding, size, + addr, done); +#endif + + /* Indirection is used to get dynamic relocations out of a + read-only section. */ + if (encoding & DW_EH_PE_indirect) + { + /* It is very tempting to use force_const_mem so that we share data + with the normal constant pool. However, we've already emitted + the constant pool for this function. Moreover, we'd like to + share these constants across the entire unit of translation and + even, if possible, across the entire application (or DSO). */ + addr = dw2_force_const_mem (addr, public); + encoding &= ~DW_EH_PE_indirect; + goto restart; + } + + switch (encoding & 0xF0) + { + case DW_EH_PE_absptr: + dw2_assemble_integer (size, addr); + break; + + case DW_EH_PE_pcrel: + gcc_assert (GET_CODE (addr) == SYMBOL_REF); +#ifdef ASM_OUTPUT_DWARF_PCREL + ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, XSTR (addr, 0)); +#else + dw2_assemble_integer (size, gen_rtx_MINUS (Pmode, addr, pc_rtx)); +#endif + break; + + default: + /* Other encodings should have been handled by + ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX. */ + gcc_unreachable (); + } + +#ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX + done:; +#endif + } + + if (flag_debug_asm && comment) + { + fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START); + vfprintf (asm_out_file, comment, ap); + } + fputc ('\n', asm_out_file); + + va_end (ap); +} + +#include "gt-dwarf2asm.h" |