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概要[]
実装[]
111 struct expr_status GTY(())
112 {
113 /* Number of units that we should eventually pop off the stack.
114 These are the arguments to function calls that have already returned. */
115 int x_pending_stack_adjust;
116
117 /* Under some ABIs, it is the caller's responsibility to pop arguments
118 pushed for function calls. A naive implementation would simply pop
119 the arguments immediately after each call. However, if several
120 function calls are made in a row, it is typically cheaper to pop
121 all the arguments after all of the calls are complete since a
122 single pop instruction can be used. Therefore, GCC attempts to
123 defer popping the arguments until absolutely necessary. (For
124 example, at the end of a conditional, the arguments must be popped,
125 since code outside the conditional won't know whether or not the
126 arguments need to be popped.)
127
128 When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
129 attempt to defer pops. Instead, the stack is popped immediately
130 after each call. Rather then setting this variable directly, use
131 NO_DEFER_POP and OK_DEFER_POP. */
132 int x_inhibit_defer_pop;
133
134 /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
135 boundary can be momentarily unaligned while pushing the arguments.
136 Record the delta since last aligned boundary here in order to get
137 stack alignment in the nested function calls working right. */
138 int x_stack_pointer_delta;
139
140 /* Nonzero means __builtin_saveregs has already been done in this function.
141 The value is the pseudoreg containing the value __builtin_saveregs
142 returned. */
143 rtx x_saveregs_value;
144
145 /* Similarly for __builtin_apply_args. */
146 rtx x_apply_args_value;
147
148 /* List of labels that must never be deleted. */
149 rtx x_forced_labels;
150 };