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239 lines
14 KiB
HTML
239 lines
14 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Data Output - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Assembler-Format.html#Assembler-Format" title="Assembler Format">
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<link rel="prev" href="File-Framework.html#File-Framework" title="File Framework">
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<link rel="next" href="Uninitialized-Data.html#Uninitialized-Data" title="Uninitialized Data">
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<!--
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Funding Free Software'', the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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funds for GNU development.-->
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Data-Output"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Uninitialized-Data.html#Uninitialized-Data">Uninitialized Data</a>,
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Previous: <a rel="previous" accesskey="p" href="File-Framework.html#File-Framework">File Framework</a>,
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Up: <a rel="up" accesskey="u" href="Assembler-Format.html#Assembler-Format">Assembler Format</a>
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<hr>
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</div>
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<h4 class="subsection">17.20.2 Output of Data</h4>
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<div class="defun">
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— Target Hook: const char * <b>TARGET_ASM_BYTE_OP</b><var><a name="index-TARGET_005fASM_005fBYTE_005fOP-4581"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_ALIGNED_HI_OP</b><var><a name="index-TARGET_005fASM_005fALIGNED_005fHI_005fOP-4582"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_ALIGNED_SI_OP</b><var><a name="index-TARGET_005fASM_005fALIGNED_005fSI_005fOP-4583"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_ALIGNED_DI_OP</b><var><a name="index-TARGET_005fASM_005fALIGNED_005fDI_005fOP-4584"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_ALIGNED_TI_OP</b><var><a name="index-TARGET_005fASM_005fALIGNED_005fTI_005fOP-4585"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_UNALIGNED_HI_OP</b><var><a name="index-TARGET_005fASM_005fUNALIGNED_005fHI_005fOP-4586"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_UNALIGNED_SI_OP</b><var><a name="index-TARGET_005fASM_005fUNALIGNED_005fSI_005fOP-4587"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_UNALIGNED_DI_OP</b><var><a name="index-TARGET_005fASM_005fUNALIGNED_005fDI_005fOP-4588"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_UNALIGNED_TI_OP</b><var><a name="index-TARGET_005fASM_005fUNALIGNED_005fTI_005fOP-4589"></a></var><br>
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<blockquote><p>These hooks specify assembly directives for creating certain kinds
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of integer object. The <code>TARGET_ASM_BYTE_OP</code> directive creates a
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byte-sized object, the <code>TARGET_ASM_ALIGNED_HI_OP</code> one creates an
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aligned two-byte object, and so on. Any of the hooks may be
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<code>NULL</code>, indicating that no suitable directive is available.
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<p>The compiler will print these strings at the start of a new line,
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followed immediately by the object's initial value. In most cases,
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the string should contain a tab, a pseudo-op, and then another tab.
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</p></blockquote></div>
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<div class="defun">
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— Target Hook: bool <b>TARGET_ASM_INTEGER</b> (<var>rtx x, unsigned int size, int aligned_p</var>)<var><a name="index-TARGET_005fASM_005fINTEGER-4590"></a></var><br>
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<blockquote><p>The <code>assemble_integer</code> function uses this hook to output an
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integer object. <var>x</var> is the object's value, <var>size</var> is its size
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in bytes and <var>aligned_p</var> indicates whether it is aligned. The
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function should return <code>true</code> if it was able to output the
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object. If it returns false, <code>assemble_integer</code> will try to
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split the object into smaller parts.
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<p>The default implementation of this hook will use the
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<code>TARGET_ASM_BYTE_OP</code> family of strings, returning <code>false</code>
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when the relevant string is <code>NULL</code>.
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</p></blockquote></div>
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<div class="defun">
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— Target Hook: void <b>TARGET_ASM_DECL_END</b> (<var>void</var>)<var><a name="index-TARGET_005fASM_005fDECL_005fEND-4591"></a></var><br>
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<blockquote><p>Define this hook if the target assembler requires a special marker to
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terminate an initialized variable declaration.
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</p></blockquote></div>
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<div class="defun">
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— Target Hook: bool <b>TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA</b> (<var>FILE *file, rtx x</var>)<var><a name="index-TARGET_005fASM_005fOUTPUT_005fADDR_005fCONST_005fEXTRA-4592"></a></var><br>
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<blockquote><p>A target hook to recognize <var>rtx</var> patterns that <code>output_addr_const</code>
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can't deal with, and output assembly code to <var>file</var> corresponding to
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the pattern <var>x</var>. This may be used to allow machine-dependent
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<code>UNSPEC</code>s to appear within constants.
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<p>If target hook fails to recognize a pattern, it must return <code>false</code>,
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so that a standard error message is printed. If it prints an error message
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itself, by calling, for example, <code>output_operand_lossage</code>, it may just
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return <code>true</code>.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>ASM_OUTPUT_ASCII</b> (<var>stream, ptr, len</var>)<var><a name="index-ASM_005fOUTPUT_005fASCII-4593"></a></var><br>
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<blockquote><p>A C statement to output to the stdio stream <var>stream</var> an assembler
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instruction to assemble a string constant containing the <var>len</var>
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bytes at <var>ptr</var>. <var>ptr</var> will be a C expression of type
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<code>char *</code> and <var>len</var> a C expression of type <code>int</code>.
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<p>If the assembler has a <code>.ascii</code> pseudo-op as found in the
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Berkeley Unix assembler, do not define the macro
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<code>ASM_OUTPUT_ASCII</code>.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>ASM_OUTPUT_FDESC</b> (<var>stream, decl, n</var>)<var><a name="index-ASM_005fOUTPUT_005fFDESC-4594"></a></var><br>
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<blockquote><p>A C statement to output word <var>n</var> of a function descriptor for
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<var>decl</var>. This must be defined if <code>TARGET_VTABLE_USES_DESCRIPTORS</code>
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is defined, and is otherwise unused.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>CONSTANT_POOL_BEFORE_FUNCTION</b><var><a name="index-CONSTANT_005fPOOL_005fBEFORE_005fFUNCTION-4595"></a></var><br>
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<blockquote><p>You may define this macro as a C expression. You should define the
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expression to have a nonzero value if GCC should output the constant
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pool for a function before the code for the function, or a zero value if
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GCC should output the constant pool after the function. If you do
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not define this macro, the usual case, GCC will output the constant
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pool before the function.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>ASM_OUTPUT_POOL_PROLOGUE</b> (<var>file, funname, fundecl, size</var>)<var><a name="index-ASM_005fOUTPUT_005fPOOL_005fPROLOGUE-4596"></a></var><br>
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<blockquote><p>A C statement to output assembler commands to define the start of the
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constant pool for a function. <var>funname</var> is a string giving
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the name of the function. Should the return type of the function
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be required, it can be obtained via <var>fundecl</var>. <var>size</var>
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is the size, in bytes, of the constant pool that will be written
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immediately after this call.
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<p>If no constant-pool prefix is required, the usual case, this macro need
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not be defined.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>ASM_OUTPUT_SPECIAL_POOL_ENTRY</b> (<var>file, x, mode, align, labelno, jumpto</var>)<var><a name="index-ASM_005fOUTPUT_005fSPECIAL_005fPOOL_005fENTRY-4597"></a></var><br>
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<blockquote><p>A C statement (with or without semicolon) to output a constant in the
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constant pool, if it needs special treatment. (This macro need not do
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anything for RTL expressions that can be output normally.)
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<p>The argument <var>file</var> is the standard I/O stream to output the
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assembler code on. <var>x</var> is the RTL expression for the constant to
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output, and <var>mode</var> is the machine mode (in case <var>x</var> is a
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‘<samp><span class="samp">const_int</span></samp>’). <var>align</var> is the required alignment for the value
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<var>x</var>; you should output an assembler directive to force this much
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alignment.
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<p>The argument <var>labelno</var> is a number to use in an internal label for
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the address of this pool entry. The definition of this macro is
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responsible for outputting the label definition at the proper place.
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Here is how to do this:
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<pre class="smallexample"> <code>(*targetm.asm_out.internal_label)</code> (<var>file</var>, "LC", <var>labelno</var>);
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</pre>
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<p>When you output a pool entry specially, you should end with a
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<code>goto</code> to the label <var>jumpto</var>. This will prevent the same pool
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entry from being output a second time in the usual manner.
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<p>You need not define this macro if it would do nothing.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>ASM_OUTPUT_POOL_EPILOGUE</b> (<var>file funname fundecl size</var>)<var><a name="index-ASM_005fOUTPUT_005fPOOL_005fEPILOGUE-4598"></a></var><br>
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<blockquote><p>A C statement to output assembler commands to at the end of the constant
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pool for a function. <var>funname</var> is a string giving the name of the
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function. Should the return type of the function be required, you can
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obtain it via <var>fundecl</var>. <var>size</var> is the size, in bytes, of the
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constant pool that GCC wrote immediately before this call.
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<p>If no constant-pool epilogue is required, the usual case, you need not
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define this macro.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>IS_ASM_LOGICAL_LINE_SEPARATOR</b> (<var>C, STR</var>)<var><a name="index-IS_005fASM_005fLOGICAL_005fLINE_005fSEPARATOR-4599"></a></var><br>
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<blockquote><p>Define this macro as a C expression which is nonzero if <var>C</var> is
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used as a logical line separator by the assembler. <var>STR</var> points
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to the position in the string where <var>C</var> was found; this can be used if
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a line separator uses multiple characters.
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<p>If you do not define this macro, the default is that only
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the character ‘<samp><span class="samp">;</span></samp>’ is treated as a logical line separator.
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</p></blockquote></div>
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<div class="defun">
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— Target Hook: const char * <b>TARGET_ASM_OPEN_PAREN</b><var><a name="index-TARGET_005fASM_005fOPEN_005fPAREN-4600"></a></var><br>
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— Target Hook: const char * <b>TARGET_ASM_CLOSE_PAREN</b><var><a name="index-TARGET_005fASM_005fCLOSE_005fPAREN-4601"></a></var><br>
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<blockquote><p>These target hooks are C string constants, describing the syntax in the
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assembler for grouping arithmetic expressions. If not overridden, they
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default to normal parentheses, which is correct for most assemblers.
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</p></blockquote></div>
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<p>These macros are provided by <samp><span class="file">real.h</span></samp> for writing the definitions
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of <code>ASM_OUTPUT_DOUBLE</code> and the like:
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<div class="defun">
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— Macro: <b>REAL_VALUE_TO_TARGET_SINGLE</b> (<var>x, l</var>)<var><a name="index-REAL_005fVALUE_005fTO_005fTARGET_005fSINGLE-4602"></a></var><br>
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— Macro: <b>REAL_VALUE_TO_TARGET_DOUBLE</b> (<var>x, l</var>)<var><a name="index-REAL_005fVALUE_005fTO_005fTARGET_005fDOUBLE-4603"></a></var><br>
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— Macro: <b>REAL_VALUE_TO_TARGET_LONG_DOUBLE</b> (<var>x, l</var>)<var><a name="index-REAL_005fVALUE_005fTO_005fTARGET_005fLONG_005fDOUBLE-4604"></a></var><br>
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— Macro: <b>REAL_VALUE_TO_TARGET_DECIMAL32</b> (<var>x, l</var>)<var><a name="index-REAL_005fVALUE_005fTO_005fTARGET_005fDECIMAL32-4605"></a></var><br>
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— Macro: <b>REAL_VALUE_TO_TARGET_DECIMAL64</b> (<var>x, l</var>)<var><a name="index-REAL_005fVALUE_005fTO_005fTARGET_005fDECIMAL64-4606"></a></var><br>
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— Macro: <b>REAL_VALUE_TO_TARGET_DECIMAL128</b> (<var>x, l</var>)<var><a name="index-REAL_005fVALUE_005fTO_005fTARGET_005fDECIMAL128-4607"></a></var><br>
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<blockquote><p>These translate <var>x</var>, of type <code>REAL_VALUE_TYPE</code>, to the
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target's floating point representation, and store its bit pattern in
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the variable <var>l</var>. For <code>REAL_VALUE_TO_TARGET_SINGLE</code> and
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<code>REAL_VALUE_TO_TARGET_DECIMAL32</code>, this variable should be a
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simple <code>long int</code>. For the others, it should be an array of
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<code>long int</code>. The number of elements in this array is determined
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by the size of the desired target floating point data type: 32 bits of
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it go in each <code>long int</code> array element. Each array element holds
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32 bits of the result, even if <code>long int</code> is wider than 32 bits
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on the host machine.
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<p>The array element values are designed so that you can print them out
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using <code>fprintf</code> in the order they should appear in the target
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machine's memory.
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</p></blockquote></div>
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</body></html>
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