diff options
Diffstat (limited to 'llvm/docs/TableGen/LangIntro.rst')
| -rw-r--r-- | llvm/docs/TableGen/LangIntro.rst | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/llvm/docs/TableGen/LangIntro.rst b/llvm/docs/TableGen/LangIntro.rst index a148634e3ed..c1391e73646 100644 --- a/llvm/docs/TableGen/LangIntro.rst +++ b/llvm/docs/TableGen/LangIntro.rst @@ -232,7 +232,7 @@ the record ends with a semicolon. Here is a simple TableGen file: -.. code-block:: llvm +.. code-block:: text class C { bit V = 1; } def X : C; @@ -276,7 +276,7 @@ derived class or definition wants to override. Let expressions consist of the value. For example, a new class could be added to the example above, redefining the ``V`` field for all of its subclasses: -.. code-block:: llvm +.. code-block:: text class D : C { let V = 0; } def Z : D; @@ -295,7 +295,7 @@ concrete classes. Parameterized TableGen classes specify a list of variable bindings (which may optionally have defaults) that are bound when used. Here is a simple example: -.. code-block:: llvm +.. code-block:: text class FPFormat<bits<3> val> { bits<3> Value = val; @@ -316,7 +316,7 @@ integer. The more esoteric forms of `TableGen expressions`_ are useful in conjunction with template arguments. As an example: -.. code-block:: llvm +.. code-block:: text class ModRefVal<bits<2> val> { bits<2> Value = val; @@ -346,7 +346,7 @@ be used to decouple the interface provided to the user of the class from the actual internal data representation expected by the class. In this case, running ``llvm-tblgen`` on the example prints the following definitions: -.. code-block:: llvm +.. code-block:: text def bork { // Value bit isMod = 1; @@ -379,7 +379,7 @@ commonality exists, then in a separate place indicate what all the ops are. Here is an example TableGen fragment that shows this idea: -.. code-block:: llvm +.. code-block:: text def ops; def GPR; @@ -405,7 +405,7 @@ inherit from multiple multiclasses, instantiating definitions from each multiclass. Using a multiclass this way is exactly equivalent to instantiating the classes multiple times yourself, e.g. by writing: -.. code-block:: llvm +.. code-block:: text def ops; def GPR; @@ -432,7 +432,7 @@ the classes multiple times yourself, e.g. by writing: A ``defm`` can also be used inside a multiclass providing several levels of multiclass instantiations. -.. code-block:: llvm +.. code-block:: text class Instruction<bits<4> opc, string Name> { bits<4> opcode = opc; @@ -473,7 +473,7 @@ multiclass instantiations. the class list must start after the last multiclass, and there must be at least one multiclass before them. -.. code-block:: llvm +.. code-block:: text class XD { bits<4> Prefix = 11; } class XS { bits<4> Prefix = 12; } @@ -516,7 +516,7 @@ specified file in place of the include directive. The filename should be specified as a double quoted string immediately after the '``include``' keyword. Example: -.. code-block:: llvm +.. code-block:: text include "foo.td" @@ -532,7 +532,7 @@ commonality from the records. File-scope "let" expressions take a comma-separated list of bindings to apply, and one or more records to bind the values in. Here are some examples: -.. code-block:: llvm +.. code-block:: text let isTerminator = 1, isReturn = 1, isBarrier = 1, hasCtrlDep = 1 in def RET : I<0xC3, RawFrm, (outs), (ins), "ret", [(X86retflag 0)]>; @@ -559,7 +559,7 @@ ways to factor out commonality from the records, specially if using several levels of multiclass instantiations. This also avoids the need of using "let" expressions within subsequent records inside a multiclass. -.. code-block:: llvm +.. code-block:: text multiclass basic_r<bits<4> opc> { let Predicates = [HasSSE2] in { @@ -587,7 +587,7 @@ TableGen supports the '``foreach``' block, which textually replicates the loop body, substituting iterator values for iterator references in the body. Example: -.. code-block:: llvm +.. code-block:: text foreach i = [0, 1, 2, 3] in { def R#i : Register<...>; @@ -598,7 +598,7 @@ This will create objects ``R0``, ``R1``, ``R2`` and ``R3``. ``foreach`` blocks may be nested. If there is only one item in the body the braces may be elided: -.. code-block:: llvm +.. code-block:: text foreach i = [0, 1, 2, 3] in def R#i : Register<...>; |
