SLAU131V User guide | 德州仪器 TI.com.cn

SLAU131V October 2004 – February 2020

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8.5.10.3 Assignment Expressions

These rules apply to linker expressions:

Expressions can contain global symbols, constants, and the C language operators listed in Table 8-11.
All numbers are treated as long (32-bit) integers.
Constants are identified by the linker in the same way as by the assembler. That is, numbers are recognized as decimal unless they have a suffix (H or h for hexadecimal and Q or q for octal). C language prefixes are also recognized (0 for octal and 0x for hex). Hexadecimal constants must begin with a digit. No binary constants are allowed.
Symbols within an expression have only the value of the symbol's address. No type-checking is performed.
Linker expressions can be absolute or relocatable. If an expression contains any relocatable symbols (and 0 or more constants or absolute symbols), it is relocatable. Otherwise, the expression is absolute. If a symbol is assigned the value of a relocatable expression, it is relocatable; if it is assigned the value of an absolute expression, it is absolute.

The linker supports the C language operators listed inTable 8-11 in order of precedence. Operators in the same group have the same precedence. Besides the operators listed in Table 8-11, the linker also has an align operator that allows a symbol to be aligned on an n-byte boundary within an output section (n is a power of 2). For example, the following expression aligns the SPC within the current section on the next 16-byte boundary. Because the align operator is a function of the current SPC, it can be used only in the same context as . —that is, within a SECTIONS directive.

. = align(16);

Table 8-11 Groups of Operators Used in Expressions (Precedence)

Group 1 (Highest Precedence)		Group 6
! ~ -	Logical NOT Bitwise NOT Negation	&	Bitwise AND
Group 2		Group 7
* / %	Multiplication Division Modulus	\|	Bitwise OR
Group 3		Group 8
+ -	Addition Subtraction	&&	Logical AND
Group 4		Group 9
>> <<	Arithmetic right shift Arithmetic left shift	\|\|	Logical OR
	Group 5	Group 10 (Lowest Precedence)
== ! = > < < = > =	Equal to Not equal to Greater than Less than Less than or equal to Greater than or equal to	= + = - = * = / =	Assignment A + = B A - = B A * = B A / = B	is equivalent to is equivalent to is equivalent to is equivalent to	A = A + B A = A - B A = A * B A = A / B