69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "compiler.h"
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#include "opcode.h"
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#include "mdq.h"
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#include "cgp.h"
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#include "emit_code.h"
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#include "rtnhdr.h"
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#include "obj_file.h"
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GBLREF int4 curr_addr, code_size;
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GBLREF char cg_phase; /* code generation phase */
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GBLREF triple t_orig; /* head of triples */
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LITREF octabstruct oc_tab[]; /* op-code table */
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void shrink_jmps(void)
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{
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int new_size, old_size, shrink;
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triple *ct; /* current triple */
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DCL_THREADGBL_ACCESS;
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SETUP_THREADGBL_ACCESS;
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assert(CGP_ADDR_OPT == cg_phase);
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do
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{
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shrink = 0;
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dqloop(&t_orig, exorder, ct)
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{
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if ((oc_tab[ct->opcode].octype & OCT_JUMP) || (OC_LDADDR == ct->opcode) || (OC_FORLOOP == ct->opcode))
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{
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old_size = ct->exorder.fl->rtaddr - ct->rtaddr;
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curr_addr = 0;
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if (0 > ct->operand[0].oprval.tref->rtaddr - ct->rtaddr)
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{
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ct->rtaddr -= shrink;
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trip_gen(ct);
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} else
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{
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trip_gen(ct);
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ct->rtaddr -= shrink;
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}
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new_size = curr_addr; /* size of operand 0 */
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assert(old_size >= new_size);
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shrink += old_size - new_size;
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} else
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ct->rtaddr -= shrink;
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}/* dqloop */
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code_size -= shrink;
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} while (shrink != 0);
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/* Now that the code has been strunk, we may have to adjust the pad length of the code segment. Compute
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this by now subtracting out the size of the pad length from the code size and recomputing the pad length
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and readjusting the code size. (see similar computation in code_gen().
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*/
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code_size -= TREF(codegen_padlen);
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TREF(codegen_padlen) = PADLEN(code_size, SECTION_ALIGN_BOUNDARY); /* Length to pad to align next section */
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code_size += TREF(codegen_padlen);
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}
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