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ast_unary::make: safer double-negation optimization check

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Wolfgang Bumiller 2015-02-01 12:13:05 +01:00
parent 896d4c53a3
commit 6d4539814e
1 changed files with 14 additions and 10 deletions
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24
ast.cpp
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@ -365,16 +365,20 @@ ast_binstore::~ast_binstore()
ast_unary* ast_unary::make(lex_ctx_t ctx, int op, ast_expression *expr) ast_unary* ast_unary::make(lex_ctx_t ctx, int op, ast_expression *expr)
{ {
if (ast_istype(expr, ast_unary) && OPTS_OPTIMIZATION(OPTIM_PEEPHOLE)) { // handle double negation, double bitwise or logical not
ast_unary *prev = (ast_unary*)((ast_unary*)expr)->m_operand; if (op == opid2('!','P') ||
op == opid2('~','P') ||
/* Handle for double negation */ op == opid2('-','P'))
if (((ast_unary*)expr)->m_op == op) {
prev = (ast_unary*)((ast_unary*)expr)->m_operand; if (ast_istype(expr, ast_unary) && OPTS_OPTIMIZATION(OPTIM_PEEPHOLE)) {
ast_unary *unary = reinterpret_cast<ast_unary*>(expr);
if (ast_istype(prev, ast_unary)) { if (unary->m_op == op) {
++opts_optimizationcount[OPTIM_PEEPHOLE]; auto out = reinterpret_cast<ast_unary*>(unary->m_operand);
return prev; unary->m_operand = nullptr;
delete unary;
++opts_optimizationcount[OPTIM_PEEPHOLE];
return out;
}
} }
} }