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author | Chris Lattner <sabre@nondot.org> | 2009-04-06 21:50:39 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2009-04-06 21:50:39 +0000 |
commit | dcd006bf7be859367f35db2417a42c83451431e8 (patch) | |
tree | ccd65cdbf61fb29290e6f534ff8e6a9ead5d7ead /docs/BitCodeFormat.html | |
parent | 8f3434647d3d39b49475239e3be1b8afb06415cf (diff) | |
download | llvm-dcd006bf7be859367f35db2417a42c83451431e8.tar.gz llvm-dcd006bf7be859367f35db2417a42c83451431e8.tar.bz2 llvm-dcd006bf7be859367f35db2417a42c83451431e8.tar.xz |
add a new Blob encoding abbreviation for bitcode files that emits
elements in a form that is efficient for the reader to just get a
pointer in memory and start reading. APIs to do efficient reading
and writing are still todo.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68465 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/BitCodeFormat.html')
-rw-r--r-- | docs/BitCodeFormat.html | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/BitCodeFormat.html b/docs/BitCodeFormat.html index 8a53f27abe..54b9361c37 100644 --- a/docs/BitCodeFormat.html +++ b/docs/BitCodeFormat.html @@ -478,6 +478,13 @@ emitted as their code, followed by the extra data. <li value="4">Char6: This field should be emitted as a <a href="#char6">char6-encoded value</a>. This operand type takes no extra data.</li> +<li value="5">Blob: This field is emitted as a vbr6, followed by padding to a + 32-bit boundary (for alignment) and an array of 8-bit objects. The array of + bytes is further followed by tail padding to ensure that its total length is + a multiple of 4 bytes. This makes it very efficient for the reader to + decode the data without having to make a copy of it: it can use a pointer to + the data in the mapped in file and poke directly at it. A blob may only + occur as the last operand of an abbreviation.</li> </ol> <p> |