mirror of
https://github.com/yasm/yasm
synced 2026-08-26 22:26:05 -04:00
3e8d2c2e7a
PC-relative relocations (jumps and calls). - Allow SEG:OFF to be used as just an offset portion (like NASM does). - Labels in absolute sections that are declared global are given the correct absolute value in the symbol table. One difference from NASM: label equ 0040h:001eh jmp label in NASM means the same as: jmp 001eh (a near jump) but yasm will treat this the same as: jmp 0040h:001eh (a far jump) I'm still not completely happy with this implementation, but it's workable and fixes all the bugs I've found so far in absolute handling. svn path=/trunk/yasm/; revision=1634
244 lines
9.2 KiB
C
244 lines
9.2 KiB
C
/**
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* \file libyasm/expr.h
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* \brief YASM expression interface.
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*
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* \rcs
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* $Id$
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* \endrcs
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*
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* \license
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* Copyright (C) 2001 Michael Urman, Peter Johnson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* \endlicense
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*/
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#ifndef YASM_EXPR_H
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#define YASM_EXPR_H
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/** Expression item (opaque type). \internal */
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typedef struct yasm_expr__item yasm_expr__item;
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/** Create a new expression e=a op b.
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* \param op operation
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* \param a expression item a
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* \param b expression item b (optional depending on op)
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* \param line virtual line (where expression defined)
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* \return Newly allocated expression.
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*/
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/*@only@*/ yasm_expr *yasm_expr_create
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(yasm_expr_op op, /*@only@*/ yasm_expr__item *a,
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/*@only@*/ /*@null@*/ yasm_expr__item *b, unsigned long line);
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/** Create a new preceding-bytecode expression item.
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* \param precbc preceding bytecode
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* \return Newly allocated expression item.
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*/
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/*@only@*/ yasm_expr__item *yasm_expr_precbc(/*@keep@*/ yasm_bytecode *precbc);
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/** Create a new symbol expression item.
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* \param sym symbol
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* \return Newly allocated expression item.
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*/
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/*@only@*/ yasm_expr__item *yasm_expr_sym(/*@keep@*/ yasm_symrec *sym);
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/** Create a new expression expression item.
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* \param e expression
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* \return Newly allocated expression item.
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*/
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/*@only@*/ yasm_expr__item *yasm_expr_expr(/*@keep@*/ yasm_expr *e);
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/** Create a new intnum expression item.
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* \param intn intnum
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* \return Newly allocated expression item.
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*/
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/*@only@*/ yasm_expr__item *yasm_expr_int(/*@keep@*/ yasm_intnum *intn);
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/** Create a new floatnum expression item.
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* \param flt floatnum
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* \return Newly allocated expression item.
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*/
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/*@only@*/ yasm_expr__item *yasm_expr_float(/*@keep@*/ yasm_floatnum *flt);
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/** Create a new register expression item.
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* \param reg register
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* \return Newly allocated expression item.
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*/
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/*@only@*/ yasm_expr__item *yasm_expr_reg(unsigned long reg);
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/** Create a new expression tree e=l op r.
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* \param l expression for left side of new expression
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* \param o operation
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* \param r expression for right side of new expression
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* \param i line index
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* \return Newly allocated expression.
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*/
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#define yasm_expr_create_tree(l,o,r,i) \
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yasm_expr_create ((o), yasm_expr_expr(l), yasm_expr_expr(r), i)
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/** Create a new expression branch e=op r.
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* \param o operation
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* \param r expression for right side of new expression
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* \param i line index
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* \return Newly allocated expression.
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*/
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#define yasm_expr_create_branch(o,r,i) \
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yasm_expr_create ((o), yasm_expr_expr(r), (yasm_expr__item *)NULL, i)
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/** Create a new expression identity e=r.
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* \param r expression for identity within new expression
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* \param i line index
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* \return Newly allocated expression.
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*/
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#define yasm_expr_create_ident(r,i) \
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yasm_expr_create (YASM_EXPR_IDENT, (r), (yasm_expr__item *)NULL, i)
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/** Duplicate an expression.
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* \param e expression
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* \return Newly allocated expression identical to e.
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*/
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yasm_expr *yasm_expr_copy(const yasm_expr *e);
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/** Destroy (free allocated memory for) an expression.
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* \param e expression
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*/
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void yasm_expr_destroy(/*@only@*/ /*@null@*/ yasm_expr *e);
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/** Determine if an expression is a specified operation (at the top level).
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* \param e expression
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* \param op operator
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* \return Nonzero if the expression was the specified operation at the top
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* level, zero otherwise.
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*/
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int yasm_expr_is_op(const yasm_expr *e, yasm_expr_op op);
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/** Extra transformation function for yasm_expr__level_tree().
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* \param e expression being simplified
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* \param d data provided as expr_xform_extra_data to
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* yasm_expr__level_tree()
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* \return Transformed e.
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*/
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typedef /*@only@*/ yasm_expr * (*yasm_expr_xform_func)
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(/*@returned@*/ /*@only@*/ yasm_expr *e, /*@null@*/ void *d);
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/** Linked list of expression entries.
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* \internal
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* Used internally by yasm_expr__level_tree().
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*/
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typedef struct yasm__exprhead yasm__exprhead;
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#ifdef YASM_LIB_INTERNAL
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SLIST_HEAD(yasm__exprhead, yasm__exprentry);
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#endif
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/** Level an entire expression tree.
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* \internal
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* \param e expression
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* \param fold_const enable constant folding if nonzero
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* \param simplify_ident simplify identities
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* \param simplify_reg_mul simplify REG*1 identities
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* \param calc_bc_dist nonzero if distances between bytecodes should be
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* calculated, 0 if they should be left intact
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* \param expr_xform_extra extra transformation function
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* \param expr_xform_extra_data data to pass to expr_xform_extra
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* \param eh call with NULL (for internal use in recursion)
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* \return Leveled expression.
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*/
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/*@only@*/ /*@null@*/ yasm_expr *yasm_expr__level_tree
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(/*@returned@*/ /*@only@*/ /*@null@*/ yasm_expr *e, int fold_const,
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int simplify_ident, int simplify_reg_mul, int calc_bc_dist,
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/*@null@*/ yasm_expr_xform_func expr_xform_extra,
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/*@null@*/ void *expr_xform_extra_data, /*@null@*/ yasm__exprhead *eh);
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/** Simplify an expression as much as possible. Eliminates extraneous
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* branches and simplifies integer-only subexpressions. Simplified version
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* of yasm_expr__level_tree().
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* \param e expression
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* \param cbd if distance between bytecodes should be calculated
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* \return Simplified expression.
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*/
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#define yasm_expr_simplify(e, cbd) \
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yasm_expr__level_tree(e, 1, 1, 1, cbd, NULL, NULL, NULL)
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/** Extract the segment portion of an expression containing SEG:OFF, leaving
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* the offset.
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* \param ep expression (pointer to)
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* \return NULL if unable to extract a segment (expr does not contain a
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* YASM_EXPR_SEGOFF operator), otherwise the segment expression.
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* The input expression is modified such that on return, it's the
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* offset expression.
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*/
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/*@only@*/ /*@null@*/ yasm_expr *yasm_expr_extract_deep_segoff(yasm_expr **ep);
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/** Extract the segment portion of a SEG:OFF expression, leaving the offset.
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* \param ep expression (pointer to)
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* \return NULL if unable to extract a segment (YASM_EXPR_SEGOFF not the
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* top-level operator), otherwise the segment expression. The input
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* expression is modified such that on return, it's the offset
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* expression.
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*/
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/*@only@*/ /*@null@*/ yasm_expr *yasm_expr_extract_segoff(yasm_expr **ep);
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/** Extract the right portion (y) of a x WRT y expression, leaving the left
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* portion (x).
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* \param ep expression (pointer to)
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* \return NULL if unable to extract (YASM_EXPR_WRT not the top-level
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* operator), otherwise the right side of the WRT expression. The
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* input expression is modified such that on return, it's the left side
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* of the WRT expression.
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*/
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/*@only@*/ /*@null@*/ yasm_expr *yasm_expr_extract_wrt(yasm_expr **ep);
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/** Get the integer value of an expression if it's just an integer.
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* \param ep expression (pointer to)
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* \param calc_bc_dist nonzero if distances between bytecodes should be
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* calculated, 0 if NULL should be returned in this case
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* \return NULL if the expression is too complex (contains anything other than
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* integers, ie floats, non-valued labels, registers); otherwise the
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* intnum value of the expression.
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*/
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/*@dependent@*/ /*@null@*/ yasm_intnum *yasm_expr_get_intnum
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(yasm_expr **ep, int calc_bc_dist);
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/** Get the symbol value of an expression if it's just a symbol.
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* \param ep expression (pointer to)
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* \param simplify if nonzero, simplify the expression first
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* \return NULL if the expression is too complex; otherwise the symbol value of
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* the expression.
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*/
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/*@dependent@*/ /*@null@*/ const yasm_symrec *yasm_expr_get_symrec
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(yasm_expr **ep, int simplify);
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/** Get the register value of an expression if it's just a register.
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* \param ep expression (pointer to)
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* \param simplify if nonzero, simplify the expression first
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* \return NULL if the expression is too complex; otherwise the register value
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* of the expression.
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*/
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/*@dependent@*/ /*@null@*/ const unsigned long *yasm_expr_get_reg
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(yasm_expr **ep, int simplify);
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/** Print an expression. For debugging purposes.
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* \param e expression
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* \param f file
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*/
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void yasm_expr_print(/*@null@*/ const yasm_expr *e, FILE *f);
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#endif
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