Add basic support for LLVM 18 (#63)

* Basic support for LLVM 18. Rebuild test files for it. Loop test hit some new optimisation, so had a fair bit of churn. LLVM 17 compatibility test was changede from ll to bc: The bitcode files guarantee forwards compatibility, which we need now that LLVM 18 dropped support for the webkit_jscc calling convention

* Fix some LLVM 17 mentions in LLVM 18 test file

* Remove the following constant expression types that have been removed in LLVM 18:

 - and
 - or
 - lshr
 - ashr
 - zext
 - sext
 - fptrunc
 - fpext
 - fptoui
 - fptosi
 - uitofp
 - sitofp

* Tab to space conversion in constant.rs

.github/workflows/ci.yml

@@ -25,6 +25,7 @@ jobs:
         - 15
         - 16
         - 17
+        - 18
 
     steps:
       - name: Checkout sources

Cargo.toml

@@ -21,6 +21,7 @@ llvm-sys-140 = { package = "llvm-sys", version = "140.0.0", optional = true }
 llvm-sys-150 = { package = "llvm-sys", version = "150.1.0", optional = true }
 llvm-sys-160 = { package = "llvm-sys", version = "160.1.2", optional = true }
 llvm-sys-170 = { package = "llvm-sys", version = "170.0.1", optional = true }
+llvm-sys-181 = { package = "llvm-sys", version = "181.0.0", optional = true }
 either = "1.9"
 log = "0.4"
 
@@ -40,6 +41,7 @@ llvm-14 = ["llvm-sys-140", "llvm-14-or-lower", "llvm-14-or-greater"]
 llvm-15 = ["llvm-sys-150", "llvm-15-or-lower", "llvm-15-or-greater"]
 llvm-16 = ["llvm-sys-160", "llvm-16-or-lower", "llvm-16-or-greater"]
 llvm-17 = ["llvm-sys-170", "llvm-17-or-lower", "llvm-17-or-greater"]
+llvm-18 = ["llvm-sys-181", "llvm-18-or-lower", "llvm-18-or-greater"]
 
 ###
 # For convenience, these automatically-enabled features allow us to avoid
@@ -54,6 +56,7 @@ llvm-14-or-greater = ["llvm-13-or-greater"]
 llvm-15-or-greater = ["llvm-14-or-greater"]
 llvm-16-or-greater = ["llvm-15-or-greater"]
 llvm-17-or-greater = ["llvm-16-or-greater"]
+llvm-18-or-greater = ["llvm-17-or-greater"]
 
 llvm-9-or-lower = ["llvm-10-or-lower"]
 llvm-10-or-lower = ["llvm-11-or-lower"]
@@ -63,7 +66,8 @@ llvm-13-or-lower = ["llvm-14-or-lower"]
 llvm-14-or-lower = ["llvm-15-or-lower"]
 llvm-15-or-lower = ["llvm-16-or-lower"]
 llvm-16-or-lower = ["llvm-17-or-lower"]
-llvm-17-or-lower = []
+llvm-17-or-lower = ["llvm-18-or-lower"]
+llvm-18-or-lower = []
 ###
 
 # The `strict-versioning` feature requires an exact match between the
@@ -83,6 +87,7 @@ strict-versioning = [
     "llvm-sys-150?/strict-versioning",
     "llvm-sys-160?/strict-versioning",
     "llvm-sys-170?/strict-versioning",
+    "llvm-sys-181?/strict-versioning",
 ]
 
 # The `prefer-dynamic` feature is only available on llvm-sys versions >= 120.
@@ -93,6 +98,7 @@ prefer-dynamic = [
     "llvm-sys-150?/prefer-dynamic",
     "llvm-sys-160?/prefer-dynamic",
     "llvm-sys-170?/prefer-dynamic",
+    "llvm-sys-181?/prefer-dynamic",
 ]
 
 [package.metadata.docs.rs]

README.md

@@ -37,11 +37,11 @@ add it as a dependency in your `Cargo.toml`, selecting the feature corresponding
 to the LLVM version you want:
 ```toml
 [dependencies]
-llvm-ir = { version = "0.11.0", features = ["llvm-17"] }
+llvm-ir = { version = "0.11.0", features = ["llvm-18"] }
 ```
 
 Currently, the supported LLVM versions are `llvm-9`, `llvm-10`, `llvm-11`,
-`llvm-12`, `llvm-13`, `llvm-14`, `llvm-15`, `llvm-16`, and `llvm-17`.
+`llvm-12`, `llvm-13`, `llvm-14`, `llvm-15`, `llvm-16`, `llvm-17`, and `llvm-18`.
 
 Then, the easiest way to get started is to parse some existing LLVM IR into
 this crate's data structures.
@@ -83,8 +83,8 @@ using.
 ## Compatibility
 Starting with `llvm-ir` 0.7.0, LLVM versions are selected by a Cargo feature
 flag. This means that a single crate version can be used for any supported LLVM
-version. Currently, `llvm-ir` supports LLVM versions 9 through 17, selected by
-feature flags `llvm-9` through `llvm-17`.
+version. Currently, `llvm-ir` supports LLVM versions 9 through 18, selected by
+feature flags `llvm-9` through `llvm-18`.
 
 You should select the LLVM version corresponding to the version of the LLVM
 library you are linking against (i.e., that is available on your system.)

build.rs

@@ -27,6 +27,9 @@ fn main() {
     if cfg!(feature = "llvm-17") {
         versions.push(17);
     }
+    if cfg!(feature = "llvm-18") {
+        versions.push(18);
+    }
     match versions.len() {
         0 => panic!("llvm-ir: Please select an LLVM version using a Cargo feature."),
         1 => {},

refresh-docs.sh

@@ -3,8 +3,8 @@
 # Requires ghp-import to be installed (e.g. via pip3)
 
 rm -rf target/doc &&  # purge old docs that may include docs for deps
-cargo doc --no-deps --features=llvm-17 &&  # document just this crate
+cargo doc --no-deps --features=llvm-18 &&  # document just this crate
 echo "<meta http-equiv=refresh content=0;url=llvm_ir/index.html>" > target/doc/index.html &&  # put in the top-level redirect
 ghp-import -np target/doc &&  # publish to gh-pages branch
 rm -rf target/doc &&  # kill the docs that were just this crate
-cargo doc --features=llvm-17  # regenerate all docs (including deps) for local use
+cargo doc --features=llvm-18  # regenerate all docs (including deps) for local use