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advanced-go-programming-book/images/ch3-7-pkg-var-decl-03.ditaa.txt
2018-12-14 21:50:29 +08:00

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var pt image.Point
+----------+
| |
| stack | +--------------------+ +-------------------+
| cRED | | cGRE | | cPNK |
+----------+ | var pt image.Point | -=--------> | unsafe.Sizeof(pt) |
| cAAA | | | | |
| unused | +--------------------+ +-------------------+
| | | |
+----------+ | |
| cAAA | | +=-unsafe.Offsetof(pt.Y) |
| heap | | +=-unsafe.Offsetof(pt.X) |
| | | | |
+----------+ | | unsafe.Sizeof(pt.Y) |
| cBLU | | | unsafe.Sizeof(pt.X) |
| data | : | | |
| | v v v |
+----------+ +-------+--------------+---+------+-----+ |
| | | | | | | | |
| pkg·pt.Y | <------=-- | DATA | ·pt+8(SB) | / | 8, | $0 | |
| cBLU | | cBLU | cYEL | | cRED |cRED | |
+----------+ +-------+--------------+---+------+-----+ |
| | | | | | | | |
| pkg·pt.X | <------=-- | DATA | ·pt+0(SB) | / | 8, | $0 | |
| cBLU | | cBLU | cYEL | | cRED |cRED | |
+----------+ <--+ +-------+--------------+---+------+-----+ |
| cBLU | | |
| data | +----------------=-+ :
| | pkg·pt | v
+----------+ +-------+------+-------+-----------------------+--------+
| cYEL | | | | | | |
| text | | GLOBL | ·pt | (SB), | NOPTR, | $16 |
| | | cBLU | cYEL | cYEL | cPNK | cRED |
+----------+ <--+ +-------+------+-------+-----------------------+--------+
| |
+------------------------=-+SB