scc

Simple C99 Compiler
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commit bb663d195fde2e1d89e3700f82899b469cd3fb8c
parent 5ef65b780276437e03c0028b418a6be0ef23eba6
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri, 17 Jun 2016 13:55:27 +0200

[cc2-qbe] Force to have a label in bb

Qbe needs a label at the beginning of every basic block
so we have to check this condition.

Diffstat:
cc2/arch/qbe/code.c | 19++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/cc2/arch/qbe/code.c b/cc2/arch/qbe/code.c @@ -304,6 +304,7 @@ writeout(void) Symbol *p; Type *tp; char *sep, *name; + int haslabel; if (curfun->kind == SGLOB) fputs("export ", stdout); @@ -315,14 +316,21 @@ writeout(void) break; printf("%s%s %s.val", sep, size2asm(&p->type), symname(p)); } - puts(")\n{\n@.start"); + puts(")\n{"); /* emit assembler instructions */ for (pc = prog; pc; pc = pc->next) { - if (pc->label) + if (pc->label) { + haslabel = 1; printf("%s\n", symname(pc->label)); - if (pc->op) - (*optbl[pc->op].fun)(); + } + if (!pc->op) + continue; + if (pc->flags&BBENTRY && !haslabel) + printf("%s\n", symname(newlabel())); + (*optbl[pc->op].fun)(); + if (!pc->label) + haslabel = 0; } puts("}"); @@ -486,7 +494,8 @@ getbblocks(void) case ASCALLL: case ASCALLD: case ASCALL: - pc->flags |= BBENTRY; + if (pc->next) + pc->next->flags |= BBENTRY; break; } }