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https://github.com/yasm/yasm
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135d4727dd
correct detection of absolute section reference loops (fixing a crash case). This is also needed for an ongoing rewrite of reloc/value handling. * expr.c (expr_xform_bc_dist): Remove transformation of absolute section references; move in changed form into... (yasm_expr__level_tree): Here. The new code doesn't immediately calculate the distance from the start of the absolute section to the referenced symbol; rather it generates an expression for this quantity. As this actually adds new absolute section refs to the tree, we can't expand with YASM_EXPR_SYMs, otherwise we would expand multiple times. Thus we need a new YASM_EXPR_SYMEXP type that thus does not get expanded. Unfortunately this ripples changes a bit because everywhere *else* we look for YASM_EXPR_SYM, we now need to look for YASM_EXPR_SYMEXP as well... (expr_xform_bc_dist): Here. (yasm_expr__copy_except): Here. (yasm_expr_extract_symrec): Here. (yasm_expr_get_symrec): Here. (yasm_expr_print): Here. * bin-objfmt.c (bin_objfmt_expr_xform): And here. * expr-int.h (yasm_expr__type): Define new YASM_EXPR_SYMEXP. * section.h (yasm_section_abs_get_sym): To implement above, we need to get a symbol referencing the first bytecode in the absolute section. To avoid creating redundant symrecs, one is generated for us now. This function lets us get it in yasm_expr__level_tree(). * section.c (yasm_section_abs_get_sym): Implement. (yasm_section): Add necessary SECTION_ABSOLUTE data. (yasm_section_create_absolute): Create the symrec here. * absloop-err.asm: New test for absolute section reference loops. svn path=/trunk/yasm/; revision=1417
6 lines
70 B
NASM
6 lines
70 B
NASM
[absolute x]
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label1:
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[absolute label1]
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x:
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[section .text]
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mov ax, [x]
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