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* config/tc-mips.c (RELAX_ENCODE): Remove WARN argument.
(RELAX_FIRST, RELAX_SECOND): Turn into 8-bit quantities. (RELAX_USE_SECOND): Bump to 0x10000. (RELAX_SECOND_LONGER, RELAX_NOMACRO, RELAX_DELAY_SLOT): New flags. (mips_macro_warning): New variable. (md_assemble): Wrap macro expansion in macro_start() and macro_end(). (s_cpload, s_cpsetup, s_cprestore, s_cpreturn): Likewise. (relax_close_frag): Set mips_macro_warning.first_frag. Adjust use of RELAX_ENCODE. (append_insn): Update mips_macro_warning.sizes. (macro_start, macro_warning, macro_end): New functions. (macro_build): Don't emit warnings here. (macro_build_lui, md_estimate_size_before_relax): ...or here. (md_convert_frag): Check for cases where one macro alternative needs a warning and the other doesn't. Emit a warning if the longer sequence was chosen.
This commit is contained in:
Richard Sandiford
parent
4d7206a284
commit
584892a6d5
@ -1,3 +1,22 @@
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2004-01-23 Richard Sandiford <rsandifo@redhat.com>
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* config/tc-mips.c (RELAX_ENCODE): Remove WARN argument.
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(RELAX_FIRST, RELAX_SECOND): Turn into 8-bit quantities.
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(RELAX_USE_SECOND): Bump to 0x10000.
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(RELAX_SECOND_LONGER, RELAX_NOMACRO, RELAX_DELAY_SLOT): New flags.
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(mips_macro_warning): New variable.
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(md_assemble): Wrap macro expansion in macro_start() and macro_end().
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(s_cpload, s_cpsetup, s_cprestore, s_cpreturn): Likewise.
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(relax_close_frag): Set mips_macro_warning.first_frag. Adjust use
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of RELAX_ENCODE.
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(append_insn): Update mips_macro_warning.sizes.
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(macro_start, macro_warning, macro_end): New functions.
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(macro_build): Don't emit warnings here.
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(macro_build_lui, md_estimate_size_before_relax): ...or here.
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(md_convert_frag): Check for cases where one macro alternative
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needs a warning and the other doesn't. Emit a warning if the
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longer sequence was chosen.
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2004-01-23 Richard Sandiford <rsandifo@redhat.com>
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* config/tc-mips.h (tc_frag_data_type, TC_FRAG_TYPE): Remove.
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@ -629,14 +629,27 @@ static int mips_relax_branch;
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absolute one. In SVR4 PIC, the first sequence will be for global
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symbols and the second will be for local symbols.
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The frag's "subtype" is RELAX_ENCODE (FIRST, SECOND, WARN), where
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FIRST and SECOND are the lengths of the two sequences in bytes
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and WARN is true if ".set nomacro" was in effect when the macro
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was expanded. These fields can be extracted using RELAX_FIRST(),
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RELAX_SECOND() and RELAX_WARN().
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The frag's "subtype" is RELAX_ENCODE (FIRST, SECOND), where FIRST and
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SECOND are the lengths of the two sequences in bytes. These fields
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can be extracted using RELAX_FIRST() and RELAX_SECOND(). In addition,
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the subtype has the following flags:
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In addition, the RELAX_USE_SECOND flag is set if it has been decided
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that we should use the second sequence instead of the first.
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RELAX_USE_SECOND
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Set if it has been decided that we should use the second
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sequence instead of the first.
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RELAX_SECOND_LONGER
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Set in the first variant frag if the macro's second implementation
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is longer than its first. This refers to the macro as a whole,
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not an individual relaxation.
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RELAX_NOMACRO
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Set in the first variant frag if the macro appeared in a .set nomacro
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block and if one alternative requires a warning but the other does not.
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RELAX_DELAY_SLOT
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Like RELAX_NOMACRO, but indicates that the macro appears in a branch
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delay slot.
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The frag's "opcode" points to the first fixup for relaxable code.
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@ -650,13 +663,14 @@ static int mips_relax_branch;
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The code and fixups for the unwanted alternative are discarded
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by md_convert_frag. */
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#define RELAX_ENCODE(FIRST, SECOND, WARN) \
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(((FIRST) << 8) | ((SECOND) << 1) | ((WARN) != 0))
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#define RELAX_ENCODE(FIRST, SECOND) (((FIRST) << 8) | (SECOND))
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#define RELAX_FIRST(X) (((X) >> 8) & 0x7f)
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#define RELAX_SECOND(X) (((X) >> 1) & 0x7f)
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#define RELAX_WARN(X) ((X) & 1)
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#define RELAX_USE_SECOND 0x8000
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#define RELAX_FIRST(X) (((X) >> 8) & 0xff)
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#define RELAX_SECOND(X) ((X) & 0xff)
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#define RELAX_USE_SECOND 0x10000
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#define RELAX_SECOND_LONGER 0x20000
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#define RELAX_NOMACRO 0x40000
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#define RELAX_DELAY_SLOT 0x80000
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/* Branch without likely bit. If label is out of range, we turn:
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@ -810,6 +824,21 @@ static struct {
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symbolS *symbol;
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} mips_relax;
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/* Global variables used to decide whether a macro needs a warning. */
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static struct {
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/* True if the macro is in a branch delay slot. */
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bfd_boolean delay_slot_p;
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/* For relaxable macros, sizes[0] is the length of the first alternative
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in bytes and sizes[1] is the length of the second alternative.
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For non-relaxable macros, both elements give the length of the
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macro in bytes. */
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unsigned int sizes[2];
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/* The first variant frag for this macro. */
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fragS *first_frag;
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} mips_macro_warning;
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/* Prototypes for static functions. */
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#define internalError() \
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@ -823,6 +852,8 @@ static void mips_no_prev_insn (int);
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static void mips16_macro_build
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(int *, expressionS *, const char *, const char *, va_list);
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static void load_register (int *, int, expressionS *, int);
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static void macro_start (void);
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static void macro_end (void);
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static void macro (struct mips_cl_insn * ip);
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static void mips16_macro (struct mips_cl_insn * ip);
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#ifdef LOSING_COMPILER
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@ -1340,10 +1371,12 @@ md_assemble (char *str)
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if (insn.insn_mo->pinfo == INSN_MACRO)
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{
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macro_start ();
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if (mips_opts.mips16)
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mips16_macro (&insn);
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else
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macro (&insn);
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macro_end ();
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}
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else
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{
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@ -1518,10 +1551,9 @@ mips16_mark_labels (void)
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static void
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relax_close_frag (void)
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{
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mips_macro_warning.first_frag = frag_now;
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frag_var (rs_machine_dependent, 0, 0,
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RELAX_ENCODE (mips_relax.sizes[0],
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mips_relax.sizes[1],
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mips_opts.warn_about_macros),
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RELAX_ENCODE (mips_relax.sizes[0], mips_relax.sizes[1]),
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mips_relax.symbol, 0, (char *) mips_relax.first_fixup);
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memset (&mips_relax.sizes, 0, sizeof (mips_relax.sizes));
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@ -2025,6 +2057,11 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
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mips_relax.sizes[mips_relax.sequence - 1] += 4;
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}
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if (mips_relax.sequence != 2)
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mips_macro_warning.sizes[0] += 4;
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if (mips_relax.sequence != 1)
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mips_macro_warning.sizes[1] += 4;
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f = frag_more (4);
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}
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@ -2851,6 +2888,71 @@ mips_emit_delays (bfd_boolean insns)
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mips_no_prev_insn (insns);
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}
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/* Set up global variables for the start of a new macro. */
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static void
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macro_start (void)
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{
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memset (&mips_macro_warning.sizes, 0, sizeof (mips_macro_warning.sizes));
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mips_macro_warning.delay_slot_p = (mips_opts.noreorder
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&& (prev_insn.insn_mo->pinfo
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& (INSN_UNCOND_BRANCH_DELAY
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| INSN_COND_BRANCH_DELAY
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| INSN_COND_BRANCH_LIKELY)) != 0);
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}
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/* Given that a macro is longer than 4 bytes, return the appropriate warning
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for it. Return null if no warning is needed. SUBTYPE is a bitmask of
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RELAX_DELAY_SLOT and RELAX_NOMACRO. */
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static const char *
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macro_warning (relax_substateT subtype)
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{
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if (subtype & RELAX_DELAY_SLOT)
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return _("Macro instruction expanded into multiple instructions"
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" in a branch delay slot");
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else if (subtype & RELAX_NOMACRO)
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return _("Macro instruction expanded into multiple instructions");
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else
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return 0;
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}
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/* Finish up a macro. Emit warnings as appropriate. */
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static void
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macro_end (void)
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{
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if (mips_macro_warning.sizes[0] > 4 || mips_macro_warning.sizes[1] > 4)
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{
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relax_substateT subtype;
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/* Set up the relaxation warning flags. */
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subtype = 0;
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if (mips_macro_warning.sizes[1] > mips_macro_warning.sizes[0])
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subtype |= RELAX_SECOND_LONGER;
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if (mips_opts.warn_about_macros)
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subtype |= RELAX_NOMACRO;
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if (mips_macro_warning.delay_slot_p)
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subtype |= RELAX_DELAY_SLOT;
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if (mips_macro_warning.sizes[0] > 4 && mips_macro_warning.sizes[1] > 4)
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{
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/* Either the macro has a single implementation or both
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implementations are longer than 4 bytes. Emit the
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warning now. */
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const char *msg = macro_warning (subtype);
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if (msg != 0)
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as_warn (msg);
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}
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else
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{
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/* One implementation might need a warning but the other
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definitely doesn't. */
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mips_macro_warning.first_frag->fr_subtype |= subtype;
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}
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}
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}
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/* Build an instruction created by a macro expansion. This is passed
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a pointer to the count of instructions created so far, an
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expression, the name of the instruction to build, an operand format
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@ -2866,28 +2968,6 @@ macro_build (char *place ATTRIBUTE_UNUSED, int *counter,
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va_start (args, fmt);
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if (mips_relax.sequence != 2)
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{
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if (*counter == 1)
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{
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/* If the macro is about to expand into a second instruction,
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and it is in a delay slot, print a warning. */
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if (mips_opts.noreorder
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&& (prev_prev_insn.insn_mo->pinfo
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& (INSN_UNCOND_BRANCH_DELAY
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| INSN_COND_BRANCH_DELAY
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| INSN_COND_BRANCH_LIKELY)) != 0)
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as_warn (_("Macro instruction expanded into multiple instructions in a branch delay slot"));
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/* If the macro is about to expand into a second instruction,
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print a warning if needed. We need to pass ip as a parameter
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to generate a better warning message here... */
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else if (mips_opts.warn_about_macros)
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as_warn (_("Macro instruction expanded into multiple instructions"));
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}
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++*counter;
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}
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if (mips_opts.mips16)
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{
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mips16_macro_build (counter, ep, name, fmt, args);
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@ -3253,7 +3333,7 @@ macro_build_jalr (int icnt, expressionS *ep)
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* Generate a "lui" instruction.
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*/
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static void
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macro_build_lui (char *place ATTRIBUTE_UNUSED, int *counter,
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macro_build_lui (char *place ATTRIBUTE_UNUSED, int *counter ATTRIBUTE_UNUSED,
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expressionS *ep, int regnum)
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{
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expressionS high_expr;
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@ -3266,15 +3346,6 @@ macro_build_lui (char *place ATTRIBUTE_UNUSED, int *counter,
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assert (! mips_opts.mips16);
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high_expr = *ep;
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if (mips_relax.sequence != 2)
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{
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/* If the macro is about to expand into a second instruction,
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print a warning if needed. We need to pass ip as a parameter
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to generate a better warning message here... */
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if (mips_opts.warn_about_macros && *counter == 1)
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as_warn (_("Macro instruction expanded into multiple instructions"));
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++*counter;
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}
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if (high_expr.X_op == O_constant)
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{
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@ -12230,12 +12301,14 @@ s_cpload (int ignore ATTRIBUTE_UNUSED)
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/* In ELF, this symbol is implicitly an STT_OBJECT symbol. */
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symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT;
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macro_start ();
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macro_build_lui (NULL, &icnt, &ex, mips_gp_register);
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macro_build (NULL, &icnt, &ex, "addiu", "t,r,j", mips_gp_register,
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mips_gp_register, BFD_RELOC_LO16);
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macro_build (NULL, &icnt, NULL, "addu", "d,v,t", mips_gp_register,
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mips_gp_register, tc_get_register (0));
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macro_end ();
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demand_empty_rest_of_line ();
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}
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@ -12303,6 +12376,7 @@ s_cpsetup (int ignore ATTRIBUTE_UNUSED)
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SKIP_WHITESPACE ();
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expression (&ex_sym);
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macro_start ();
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if (mips_cpreturn_register == -1)
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{
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ex_off.X_op = O_constant;
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@ -12338,6 +12412,7 @@ s_cpsetup (int ignore ATTRIBUTE_UNUSED)
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macro_build (NULL, &icnt, NULL, ADDRESS_ADD_INSN, "d,v,t", mips_gp_register,
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mips_gp_register, reg1);
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macro_end ();
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demand_empty_rest_of_line ();
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}
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@ -12383,8 +12458,10 @@ s_cprestore (int ignore ATTRIBUTE_UNUSED)
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ex.X_op_symbol = NULL;
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ex.X_add_number = mips_cprestore_offset;
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macro_start ();
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macro_build_ldst_constoffset (NULL, &icnt, &ex, ADDRESS_STORE_INSN,
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mips_gp_register, SP, HAVE_64BIT_ADDRESSES);
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macro_end ();
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demand_empty_rest_of_line ();
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}
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@ -12410,6 +12487,7 @@ s_cpreturn (int ignore ATTRIBUTE_UNUSED)
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return;
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}
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macro_start ();
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if (mips_cpreturn_register == -1)
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{
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ex.X_op = O_constant;
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@ -12423,6 +12501,7 @@ s_cpreturn (int ignore ATTRIBUTE_UNUSED)
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else
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macro_build (NULL, &icnt, NULL, "daddu", "d,v,t", mips_gp_register,
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mips_cpreturn_register, 0);
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macro_end ();
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demand_empty_rest_of_line ();
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}
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@ -12545,9 +12624,11 @@ s_cpadd (int ignore ATTRIBUTE_UNUSED)
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}
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/* Add $gp to the register named as an argument. */
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macro_start ();
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reg = tc_get_register (0);
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macro_build (NULL, &icnt, NULL, ADDRESS_ADD_INSN, "d,v,t",
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reg, reg, mips_gp_register);
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macro_end ();
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demand_empty_rest_of_line ();
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}
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@ -13155,11 +13236,6 @@ md_estimate_size_before_relax (fragS *fragp, asection *segtype)
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if (change)
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{
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fragp->fr_subtype |= RELAX_USE_SECOND;
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/* FIXME: This really needs as_warn_where. */
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if (RELAX_WARN (fragp->fr_subtype))
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as_warn (_("AT used after \".set noat\" or macro used after "
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"\".set nomacro\""));
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return -RELAX_FIRST (fragp->fr_subtype);
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}
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else
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@ -13680,6 +13756,15 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp)
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second = RELAX_SECOND (fragp->fr_subtype);
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fixp = (fixS *) fragp->fr_opcode;
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/* Possibly emit a warning if we've chosen the longer option. */
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if (((fragp->fr_subtype & RELAX_USE_SECOND) != 0)
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== ((fragp->fr_subtype & RELAX_SECOND_LONGER) != 0))
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{
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const char *msg = macro_warning (fragp->fr_subtype);
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if (msg != 0)
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as_warn_where (fragp->fr_file, fragp->fr_line, msg);
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}
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/* Go through all the fixups for the first sequence. Disable them
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(by marking them as done) if we're going to use the second
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sequence instead. */
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