Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=598 Cc: Liming Gao <[email protected]> Cc: Michael Kinney <[email protected]> Cc: Kevin W Shaw <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Yonghong Zhu <[email protected]> --- .../82_auto-generation_process.md | 34 +++++++++++----------- README.md | 1 + 2 files changed, 18 insertions(+), 17 deletions(-)
diff --git a/8_pre-build_autogen_stage/82_auto-generation_process.md
b/8_pre-build_autogen_stage/82_auto-generation_process.md
index 6ce1710..9b61e0d 100644
--- a/8_pre-build_autogen_stage/82_auto-generation_process.md
+++ b/8_pre-build_autogen_stage/82_auto-generation_process.md
@@ -657,15 +657,11 @@ Refer to the DSC and FDF file form specifications
"_Conditional Directive
Blocks_" section for additional details of how directives must be processed.
#### 8.2.4.6 Expressions
Expressions can be used in conditional directive comparison statements and in
-value fields for PCDs in the DSC and FDF files.
-
-**********
-**Note:** Expressions are not supported in the INF and DEC files.
-**********
+value fields for PCDs in the meta-data files.
Expressions follow C relation, equality, logical and bitwise precedence and
associativity. Not all C operators are supported, only operators in the
following list can be used.
@@ -681,22 +677,26 @@ Use of parenthesis is encouraged to remove ambiguity.
Additional scripting style operators may be used in place of C operators as
shown in the table below.
###### Table 12 Operator Precedence and Supported Operands
-| Operator | Use with Data Types | Notes
| Priority |
-| -------------------------------------------- | --------------------- |
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| -------- |
-| `or`, `OR`, <code>||</code> | Number, Boolean |
| Lowest |
-| `and`, `AND`, `&&` | Number, Boolean |
| |
-| <code>|</code> | Number, Boolean |
Bitwise OR
| |
-| `^`, `xor`, `XOR` | Number, Boolean |
Exclusive OR
| |
-| `&` | Number, Boolean |
Bitwise AND
| |
-| `==`, `!=`, `EQ`, `NE`, `IN` | All | The
IN operator can only be used to test a quoted unary literal string for
membership in a list.
| |
-| | | Space
characters must be used before and after the letter operators Strings compared
to boolean or numeric values using "==" or "EQ" will always return FALSE, while
using the "!=" or "NE" operators will always return TRUE | |
-| `<=`, `>=`, `<`, `>`, `LE`, `GE`, `LT`, `GT` | All | Space
characters must be used before and after the letter operators.
| |
-| `+`, `-` | Number, Boolean |
Cannot be used with strings - the system does not automatically do
concatenation. Tools should report a warning message if these operators are
used with both a boolean and number value
| |
-| `!`, `not`, `NOT` | Number, Boolean |
| Highest |
+| Operator | Use with Data Types | Notes
| Priority |
+| -------------------------------------------- | ------------------- |
-------------------------------------------------------------------------
------------------------------------------------------------------------- |
-------- |
+| `? :` | All |
Conditional operator
|
Lowest |
+| `or`, `OR`, <code>||</code> | Number, Boolean |
| |
+| `XOR`, `xor` | Number, Boolean |
| |
+| `and`, `AND`, `&&` | Number, Boolean |
| |
+| <code>|</code> | Number, Boolean | Bitwise
OR
| |
+| `^` | Number, Boolean | Bitwise
XOR
| |
+| `&` | Number, Boolean | Bitwise
AND
| |
+| `==`, `!=`, `EQ`, `NE`, `IN` | All | The IN
operator can only be used to test a quoted unary literal string for membership
in a list. | |
+| | | Strings
compared to boolean or numeric values using "==" or "EQ" will always return
FALSE, while using the "!=" or "NE" operators will always return TRUE |
|
+| `<=`, `>=`, `<`, `>`, `LE`, `GE`, `LT`, `GT` | All |
| |
+| `<<`, `>>` | Number, Boolean |
| |
+| `+`, `-` | Number, Boolean | Cannot
be used with strings - the system does not automatically do concatenation.
| |
+| `*`, `/`, `%` | Number, Boolean | Cannot
be used with strings
| |
+| `!`, `not`, `NOT`, `~` | Number, Boolean |
| Highest |
The `IN` operator can only be used to test a literal string against elements
in the following global variables:
**_$(FAMILY)_**
diff --git a/README.md b/README.md
index a370537..637a4a4 100644
--- a/README.md
+++ b/README.md
@@ -226,5 +226,6 @@ Copyright (c) 2008-2017, Intel Corporation. All rights
reserved.
| | Clarify structure PCD field value assignment precedence
| |
| | Update description for build handles PCDs for SKU support
| |
| | Add statement about module scoped `<Pcd*>` section override
scope
| |
| | Add !error statement section
| |
| | [#1110](https://bugzilla.tianocore.org/show_bug.cgi?id=1110)
Extend exclamation statement's keyword to case-insensitive
| |
+| | [#598](https://bugzilla.tianocore.org/show_bug.cgi?id=598)
update supported operators in 8.2.4.6 Expressions
| |
--
2.6.1.windows.1
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