T0b1/wasmtime
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Record information about sections of emitted code+data.

Browse Source 
The result of the emitter is a vector of bytes holding machine code,
jump tables, and (in the future) other read-only data.  Some clients,
notably Firefox's Wasm compiler, needs to separate the machine code
from the data in order to insert more code directly after the code
generated by Cranelift.

To make such separation possible, we record more information about the
emitted bytes: the sizes of each of the sections of code, jump tables,
and read-only data, as well as the locations within the code that
reference (PC-relatively) the jump tables and read-only data.
This commit is contained in:
Lars T Hansen
2019-05-21 15:53:46 +02:00
committed by Lars T Hansen
parent 70f79d23bf
commit 420850adf0
12 changed files with 166 additions and 73 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
cranelift/filetests/filetests/isa/x86/binary64.clif
View File

@@ -1424,8 +1424,8 @@ function %I64_JT(i64 [%rdi]) {
ebb0(v0: i64 [%rdi]):
; Note: The next two lines will need to change whenever instructions are
; added or removed from this test.
[-, %rax] v1 = jump_table_base.i64 jt0 ; bin: 48 8d 05 00000039
[-, %r10] v2 = jump_table_base.i64 jt0 ; bin: 4c 8d 15 00000032
[-, %rax] v1 = jump_table_base.i64 jt0 ; bin: 48 8d 05 00000039 PCRelRodata4(jt0)
[-, %r10] v2 = jump_table_base.i64 jt0 ; bin: 4c 8d 15 00000032 PCRelRodata4(jt0)
[-, %rbx] v10 = iconst.i64 1
[-, %r13] v11 = iconst.i64 2