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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#ifndef COSMOPOLITAN_TOOL_PLINKO_LIB_STACK_H_
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#define COSMOPOLITAN_TOOL_PLINKO_LIB_STACK_H_
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#include "libc/log/check.h"
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#include "tool/plinko/lib/error.h"
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#include "tool/plinko/lib/plinko.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define SetFrame(r, x) \
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do { \
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if (r & NEED_POP) { \
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Repush(x); \
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} else { \
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r |= NEED_POP; \
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Push(x); \
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} \
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} while (0)
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forceinline dword GetCurrentFrame(void) {
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DCHECK_GT(sp, 0);
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return g_stack[(sp - 1) & 0xffffffff];
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}
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forceinline void Push(int x) {
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unsigned short s = sp;
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g_stack[s] = MAKE(x, ~cx);
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if (!__builtin_add_overflow(s, 1, &s)) {
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sp = s;
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} else {
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StackOverflow();
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}
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}
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forceinline dword Pop(void) {
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DCHECK_GT(sp, 0);
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return g_stack[--sp & 0xffffffff];
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}
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forceinline void Repush(int x) {
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int i;
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DCHECK_GT(sp, 0);
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i = (sp - 1) & MASK(STACK);
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g_stack[i & 0xffffffff] = MAKE(x, HI(g_stack[i & 0xffffffff]));
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}
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_TOOL_PLINKO_LIB_STACK_H_ */
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