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Overview
| Comment: | Fix typos on the "opcodes.html" page. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
bce35e487e5508be39bf43d201aabe2b |
| User & Date: | drh 2015-08-23 20:46:51 |
Context
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2015-08-28
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| 18:13 | Improved explanation of how to build the command-line shell on the howtocompile.html page. check-in: 501ee3f88e user: drh tags: trunk | |
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2015-08-23
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| 20:46 | Fix typos on the "opcodes.html" page. check-in: bce35e487e user: drh tags: trunk | |
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2015-08-21
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| 14:22 | Add NDSeV to the front page as an acknowledged SQLite Consortium member. check-in: ccecfa130e user: drh tags: trunk | |
Changes
Changes to pages/opcode.in.
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and extracting the necessary information from comments. So the source code comments are really the canonical source of information about the virtual machine. When in doubt, refer to the source code.</p> <p>Each instruction in the virtual machine consists of an opcode and up to five operands named P1, P2 P3, P4, and P5. The P1, P2, and P3 operands are 32-bit signed integers. These operands often refer to registers but can also be use dfor other purposes. The P1 operand is usually the cursor number for opcodes that operate on cursors. P2 is usually the jump destination jump instructions. P4 may be a 32-bit signed integer, a 64-bit signed integer, a 64-bit floating point value, a string literal, a Blob literal, a pointer to a collating sequence comparison function, or a pointer to the implementation of an application-defined SQL function, or various other things. P5 is an unsigned character ................................................................................ (Column), advance the cursor to the next entry in the table (Next) or index (NextIdx), and many other operations. All cursors are automatically closed when the virtual machine terminates.</p> <p>The virtual machine contains an arbitrary number of registers with addresses beginning at one and growing upward. Each register can a single SQL value (a string, a BLOB, a signed 64-bit integer, a 64-bit floating point number, or a NULL). A register might also hold objects used internally by SQLite, such as a RowSet or Frame. </p> <h3>Viewing Programs Generated By SQLite</h3> <p>Every SQL statement that SQLite interprets results in a program |
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and extracting the necessary information from comments. So the source code comments are really the canonical source of information about the virtual machine. When in doubt, refer to the source code.</p> <p>Each instruction in the virtual machine consists of an opcode and up to five operands named P1, P2 P3, P4, and P5. The P1, P2, and P3 operands are 32-bit signed integers. These operands often refer to registers but can also be used for other purposes. The P1 operand is usually the cursor number for opcodes that operate on cursors. P2 is usually the jump destination jump instructions. P4 may be a 32-bit signed integer, a 64-bit signed integer, a 64-bit floating point value, a string literal, a Blob literal, a pointer to a collating sequence comparison function, or a pointer to the implementation of an application-defined SQL function, or various other things. P5 is an unsigned character ................................................................................ (Column), advance the cursor to the next entry in the table (Next) or index (NextIdx), and many other operations. All cursors are automatically closed when the virtual machine terminates.</p> <p>The virtual machine contains an arbitrary number of registers with addresses beginning at one and growing upward. Each register can hold a single SQL value (a string, a BLOB, a signed 64-bit integer, a 64-bit floating point number, or a NULL). A register might also hold objects used internally by SQLite, such as a RowSet or Frame. </p> <h3>Viewing Programs Generated By SQLite</h3> <p>Every SQL statement that SQLite interprets results in a program |