From 602c6eff0af98674662cf431a82ce399a267ffdc Mon Sep 17 00:00:00 2001
From: eric <>
Date: Sat, 28 Sep 2024 15:32:52 +0700
Subject: [PATCH] WIP, CPI for nostd, rebased, need tests and code review

---
 Cargo.lock                                    |   82 +-
 Cargo.toml                                    |    5 +-
 examples/example-0/Cargo.lock                 | 1729 ++++++++++++++++
 examples/example-1-nostd/Cargo.lock           | 1741 +++++++++++++++++
 examples/example-1-nostd/Cargo.toml           |   21 +
 examples/example-1-nostd/api/Cargo.toml       |   16 +
 .../example-1-nostd/api/src/instruction.rs    |   13 +
 examples/example-1-nostd/api/src/lib.rs       |    6 +
 examples/example-1-nostd/api/src/sdk.rs       |   12 +
 examples/example-1-nostd/program/Cargo.toml   |   22 +
 .../example-1-nostd/program/src/initialize.rs |   16 +
 examples/example-1-nostd/program/src/lib.rs   |   24 +
 lib/Cargo.toml                                |    6 +-
 lib/src/cpi.rs                                |  245 +--
 lib/src/cpi/nostd.rs                          |    6 +
 lib/src/cpi/nostd/common.rs                   |   55 +
 lib/src/cpi/nostd/invoke.rs                   |   53 +
 lib/src/cpi/nostd/system_program.rs           |  215 ++
 lib/src/cpi/std.rs                            |  244 +++
 lib/src/lib.rs                                |   15 +-
 lib/src/loaders.rs                            |    2 +
 lib/src/loaders/nostd.rs                      |  161 ++
 22 files changed, 4406 insertions(+), 283 deletions(-)
 create mode 100644 examples/example-0/Cargo.lock
 create mode 100644 examples/example-1-nostd/Cargo.lock
 create mode 100644 examples/example-1-nostd/Cargo.toml
 create mode 100644 examples/example-1-nostd/api/Cargo.toml
 create mode 100644 examples/example-1-nostd/api/src/instruction.rs
 create mode 100644 examples/example-1-nostd/api/src/lib.rs
 create mode 100644 examples/example-1-nostd/api/src/sdk.rs
 create mode 100644 examples/example-1-nostd/program/Cargo.toml
 create mode 100644 examples/example-1-nostd/program/src/initialize.rs
 create mode 100644 examples/example-1-nostd/program/src/lib.rs
 create mode 100644 lib/src/cpi/nostd.rs
 create mode 100644 lib/src/cpi/nostd/common.rs
 create mode 100644 lib/src/cpi/nostd/invoke.rs
 create mode 100644 lib/src/cpi/nostd/system_program.rs
 create mode 100644 lib/src/cpi/std.rs
 create mode 100644 lib/src/loaders/nostd.rs

diff --git a/Cargo.lock b/Cargo.lock
index df178c6..12cc556 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -288,9 +288,9 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "backtrace"
@@ -457,7 +457,7 @@ dependencies = [
  "proc-macro-crate 3.2.0",
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
  "syn_derive",
 ]
 
@@ -544,7 +544,7 @@ checksum = "0cc8b54b395f2fcfbb3d90c47b01c7f444d94d05bdeb775811dec868ac3bbc26"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -555,9 +555,9 @@ checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "cc"
-version = "1.1.21"
+version = "1.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07b1695e2c7e8fc85310cde85aeaab7e3097f593c91d209d3f9df76c928100f0"
+checksum = "9540e661f81799159abee814118cc139a2004b3a3aa3ea37724a1b66530b90e0"
 dependencies = [
  "jobserver",
  "libc",
@@ -625,7 +625,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -793,7 +793,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -804,7 +804,7 @@ checksum = "d336a2a514f6ccccaa3e09b02d41d35330c07ddf03a62165fcec10bb561c7806"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1367,7 +1367,7 @@ checksum = "ed3955f1a9c7c0c15e092f9c887db08b1fc683305fdf6eb6684f22555355e202"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1406,7 +1406,7 @@ dependencies = [
  "proc-macro-crate 3.2.0",
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1533,9 +1533,9 @@ dependencies = [
 
 [[package]]
 name = "portable-atomic"
-version = "1.8.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d30538d42559de6b034bc76fd6dd4c38961b1ee5c6c56e3808c50128fdbc22ce"
+checksum = "cc9c68a3f6da06753e9335d63e27f6b9754dd1920d941135b7ea8224f141adb2"
 
 [[package]]
 name = "ppv-lite86"
@@ -1553,7 +1553,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "479cf940fbbb3426c32c5d5176f62ad57549a0bb84773423ba8be9d089f5faba"
 dependencies = [
  "proc-macro2",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1623,7 +1623,7 @@ checksum = "9e2e25ee72f5b24d773cae88422baddefff7714f97aab68d96fe2b6fc4a28fb2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1737,9 +1737,9 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.5.5"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62871f2d65009c0256aed1b9cfeeb8ac272833c404e13d53d400cd0dad7a2ac0"
+checksum = "355ae415ccd3a04315d3f8246e86d67689ea74d88d915576e1589a351062a13b"
 dependencies = [
  "bitflags 2.6.0",
 ]
@@ -1844,7 +1844,7 @@ checksum = "243902eda00fad750862fc144cea25caca5e20d615af0a81bee94ca738f1df1f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1878,7 +1878,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -1995,7 +1995,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2009,6 +2009,16 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "solana-nostd-entrypoint"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39bffcabf17b7c3fac8dba63918f39badc1d7b69d5800c74a5c9c90da170d913"
+dependencies = [
+ "arrayvec",
+ "solana-program",
+]
+
 [[package]]
 name = "solana-program"
 version = "1.18.23"
@@ -2129,7 +2139,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustversion",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2202,7 +2212,7 @@ checksum = "07fd7858fc4ff8fb0e34090e41d7eb06a823e1057945c26d480bfc21d2338a93"
 dependencies = [
  "quote",
  "spl-discriminator-syn",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2214,7 +2224,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "sha2 0.10.8",
- "syn 2.0.77",
+ "syn 2.0.79",
  "thiserror",
 ]
 
@@ -2262,7 +2272,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "sha2 0.10.8",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2378,8 +2388,10 @@ dependencies = [
 name = "steel"
 version = "1.3.0"
 dependencies = [
+ "arrayvec",
  "bytemuck",
  "num_enum",
+ "solana-nostd-entrypoint",
  "solana-program",
  "spl-associated-token-account",
  "spl-token",
@@ -2396,7 +2408,7 @@ dependencies = [
  "indicatif",
  "prettyplease",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
  "tokio",
 ]
 
@@ -2425,9 +2437,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.77"
+version = "2.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f35bcdf61fd8e7be6caf75f429fdca8beb3ed76584befb503b1569faee373ed"
+checksum = "89132cd0bf050864e1d38dc3bbc07a0eb8e7530af26344d3d2bbbef83499f590"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2443,7 +2455,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2472,7 +2484,7 @@ checksum = "08904e7672f5eb876eaaf87e0ce17857500934f4981c4a0ab2b4aa98baac7fc3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2661,7 +2673,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
  "wasm-bindgen-shared",
 ]
 
@@ -2683,7 +2695,7 @@ checksum = "afc340c74d9005395cf9dd098506f7f44e38f2b4a21c6aaacf9a105ea5e1e836"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -2885,9 +2897,9 @@ checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
 [[package]]
 name = "winnow"
-version = "0.6.19"
+version = "0.6.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c52ac009d615e79296318c1bcce2d422aaca15ad08515e344feeda07df67a587"
+checksum = "36c1fec1a2bb5866f07c25f68c26e565c4c200aebb96d7e55710c19d3e8ac49b"
 dependencies = [
  "memchr",
 ]
@@ -2910,7 +2922,7 @@ checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -2930,5 +2942,5 @@ checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.77",
+ "syn 2.0.79",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 6e2fbf8..3d70c43 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,9 +27,12 @@ spl-associated-token-account = { features = [ "no-entrypoint" ], version = "^2.3
 thiserror = "1.0.57"
 tokio = "1.35"
 quote = "1.0"
+solana-nostd-entrypoint = "0.3"
+arrayvec = "0.7"
 
 # [workspace.dev-dependencies]
 # bs64 = "0.1.2"
 # solana-program-test = "^1.18"
 # solana-sdk = "^1.18"
-# tokio = { version = "1.35", features = ["full"] }
\ No newline at end of file
+# tokio = { version = "1.35", features = ["full"] }
+
diff --git a/examples/example-0/Cargo.lock b/examples/example-0/Cargo.lock
new file mode 100644
index 0000000..f4017d5
--- /dev/null
+++ b/examples/example-0/Cargo.lock
@@ -0,0 +1,1729 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ahash"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
+dependencies = [
+ "getrandom 0.2.15",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "ahash"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86fdf8605db99b54d3cd748a44c6d04df638eb5dafb219b135d0149bd0db01f6"
+
+[[package]]
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+dependencies = [
+ "ark-ec",
+ "ark-ff",
+ "ark-std",
+]
+
+[[package]]
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+dependencies = [
+ "ark-ff",
+ "ark-poly",
+ "ark-serialize",
+ "ark-std",
+ "derivative",
+ "hashbrown 0.13.2",
+ "itertools",
+ "num-traits",
+ "zeroize",
+]
+
+[[package]]
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+ "ark-std",
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+ "digest 0.10.7",
+ "itertools",
+ "num-bigint",
+ "num-traits",
+ "paste",
+ "rustc_version",
+ "zeroize",
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+
+[[package]]
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+
+[[package]]
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+dependencies = [
+ "num-bigint",
+ "num-traits",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
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+
+[[package]]
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+version = "0.4.2"
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+checksum = "d320bfc44ee185d899ccbadfa8bc31aab923ce1558716e1997a1e74057fe86bf"
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+
+[[package]]
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+[[package]]
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+
+[[package]]
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+[[package]]
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+[[package]]
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+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.79",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.93"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "585c4c91a46b072c92e908d99cb1dcdf95c5218eeb6f3bf1efa991ee7a68cccf"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.93"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afc340c74d9005395cf9dd098506f7f44e38f2b4a21c6aaacf9a105ea5e1e836"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.79",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.93"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c62a0a307cb4a311d3a07867860911ca130c3494e8c2719593806c08bc5d0484"
+
+[[package]]
+name = "web-sys"
+version = "0.3.70"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26fdeaafd9bd129f65e7c031593c24d62186301e0c72c8978fa1678be7d532c0"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
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+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "winnow"
+version = "0.6.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36c1fec1a2bb5866f07c25f68c26e565c4c200aebb96d7e55710c19d3e8ac49b"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.79",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.79",
+]
diff --git a/examples/example-1-nostd/Cargo.toml b/examples/example-1-nostd/Cargo.toml
new file mode 100644
index 0000000..e1fe9f3
--- /dev/null
+++ b/examples/example-1-nostd/Cargo.toml
@@ -0,0 +1,21 @@
+[workspace]
+resolver = "2"
+members = ["api", "program"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "Apache-2.0"
+homepage = "https://ore.supply"
+documentation = "https://ore.supply"
+repository = "https://github.com/regolith-labs/steel"
+keywords = ["solana"]
+
+[workspace.dependencies]
+bytemuck = "1.14.3"
+num_enum = "0.7.2"
+example-1-api = { path = "./api" }
+solana-program = "^1.18"
+spl-token = { version = "^4", features = ["no-entrypoint"] }
+spl-associated-token-account = { version = "^2.3", features = [ "no-entrypoint" ] } 
+steel = { path = "../../lib", features = ["nostd"] }
diff --git a/examples/example-1-nostd/api/Cargo.toml b/examples/example-1-nostd/api/Cargo.toml
new file mode 100644
index 0000000..a1b2274
--- /dev/null
+++ b/examples/example-1-nostd/api/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "example-1-api"
+description = "API for interacting with example program 1, nostd"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+repository.workspace = true
+keywords.workspace = true
+
+[dependencies]
+bytemuck.workspace = true
+num_enum.workspace = true
+solana-program.workspace = true
+steel.workspace = true
diff --git a/examples/example-1-nostd/api/src/instruction.rs b/examples/example-1-nostd/api/src/instruction.rs
new file mode 100644
index 0000000..2e5c8a8
--- /dev/null
+++ b/examples/example-1-nostd/api/src/instruction.rs
@@ -0,0 +1,13 @@
+use steel::*;
+
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, TryFromPrimitive)]
+pub enum MyInstruction {
+    Initialize = 0,
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Pod, Zeroable)]
+pub struct Initialize {}
+
+instruction!(MyInstruction, Initialize);
diff --git a/examples/example-1-nostd/api/src/lib.rs b/examples/example-1-nostd/api/src/lib.rs
new file mode 100644
index 0000000..4c82e61
--- /dev/null
+++ b/examples/example-1-nostd/api/src/lib.rs
@@ -0,0 +1,6 @@
+pub mod instruction;
+pub mod sdk;
+
+use steel::*;
+
+declare_id!("9kuuejpVHZBTXJv3oy7GHK2e9rD9Jp5pLmuDcN7EsZEG");
diff --git a/examples/example-1-nostd/api/src/sdk.rs b/examples/example-1-nostd/api/src/sdk.rs
new file mode 100644
index 0000000..1c19d9a
--- /dev/null
+++ b/examples/example-1-nostd/api/src/sdk.rs
@@ -0,0 +1,12 @@
+use steel::*;
+
+use crate::instruction::*;
+
+/// Builds an initialize instruction.
+pub fn initialize(signer: Pubkey) -> Instruction {
+    Instruction {
+        program_id: crate::id(),
+        accounts: vec![AccountMeta::new(signer, true)],
+        data: Initialize {}.to_bytes(),
+    }
+}
diff --git a/examples/example-1-nostd/program/Cargo.toml b/examples/example-1-nostd/program/Cargo.toml
new file mode 100644
index 0000000..4abd3da
--- /dev/null
+++ b/examples/example-1-nostd/program/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "example-1-program-nostd"
+description = "Example program 1 -- nostd"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+repository.workspace = true
+keywords.workspace = true
+
+[lib]
+crate-type = ["cdylib", "lib"]
+
+[features]
+default = []
+
+[dependencies]
+example-1-api.workspace = true
+solana-program.workspace = true
+steel = { workspace = true }
+
diff --git a/examples/example-1-nostd/program/src/initialize.rs b/examples/example-1-nostd/program/src/initialize.rs
new file mode 100644
index 0000000..65961cd
--- /dev/null
+++ b/examples/example-1-nostd/program/src/initialize.rs
@@ -0,0 +1,16 @@
+use steel::*;
+
+/// Initialize ...
+pub fn process_initialize(
+    accounts: &ArrayVec<NoStdAccountInfo, 32>,
+    _data: &[u8],
+) -> ProgramResult {
+    // Load accounts.
+    let [signer, ..] = accounts.as_slice() else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+    AccountInfoValidation::is_signer(signer)?;
+
+    // Return ok
+    Ok(())
+}
diff --git a/examples/example-1-nostd/program/src/lib.rs b/examples/example-1-nostd/program/src/lib.rs
new file mode 100644
index 0000000..7325c94
--- /dev/null
+++ b/examples/example-1-nostd/program/src/lib.rs
@@ -0,0 +1,24 @@
+mod initialize;
+
+use example_1_api::instruction::MyInstruction;
+use initialize::*;
+use steel::*;
+
+entrypoint_nostd!(process_instruction, 32);
+
+noalloc_allocator!();
+basic_panic_impl!();
+
+pub fn process_instruction(
+    program_id: &Pubkey,
+    accounts: &ArrayVec<NoStdAccountInfo, 32>,
+    data: &[u8],
+) -> ProgramResult {
+    let (ix, data) = parse_instruction::<MyInstruction>(&example_1_api::ID, program_id, data)?;
+
+    match ix {
+        MyInstruction::Initialize => process_initialize(accounts, data)?,
+    }
+
+    Ok(())
+}
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 84c16d4..f225e3c 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -11,8 +11,9 @@ repository.workspace = true
 keywords.workspace = true
 
 [features]
-deafult = []
+default = []
 spl = ["spl-token", "spl-associated-token-account"]
+nostd = ["solana-nostd-entrypoint", "arrayvec"]
 
 [dependencies]
 bytemuck.workspace = true
@@ -21,4 +22,5 @@ solana-program.workspace = true
 spl-token = { workspace = true, optional = true }
 spl-associated-token-account = { workspace = true, optional = true }
 thiserror.workspace = true
-
+solana-nostd-entrypoint = { workspace = true, optional = true }
+arrayvec = { workspace = true, optional = true }
\ No newline at end of file
diff --git a/lib/src/cpi.rs b/lib/src/cpi.rs
index 0a36bd6..b73f65a 100644
--- a/lib/src/cpi.rs
+++ b/lib/src/cpi.rs
@@ -1,243 +1,2 @@
-use bytemuck::Pod;
-use solana_program::{
-    account_info::AccountInfo, entrypoint::ProgramResult, pubkey::Pubkey, rent::Rent,
-    sysvar::Sysvar,
-};
-
-use crate::Discriminator;
-
-/// Creates a new program account.
-#[inline(always)]
-pub fn create_account<'a, 'info, T: Discriminator + Pod>(
-    target_account: &'a AccountInfo<'info>,
-    owner: &Pubkey,
-    seeds: &[&[u8]],
-    system_program: &'a AccountInfo<'info>,
-    payer: &'a AccountInfo<'info>,
-) -> ProgramResult {
-    // Allocate space.
-    allocate_account(
-        target_account,
-        owner,
-        8 + std::mem::size_of::<T>(),
-        seeds,
-        system_program,
-        payer,
-    )?;
-
-    // Set discriminator.
-    let mut data = target_account.data.borrow_mut();
-    data[0] = T::discriminator();
-
-    Ok(())
-}
-
-/// Allocates space for a new program account.
-#[inline(always)]
-pub fn allocate_account<'a, 'info>(
-    target_account: &'a AccountInfo<'info>,
-    owner: &Pubkey,
-    space: usize,
-    seeds: &[&[u8]],
-    system_program: &'a AccountInfo<'info>,
-    payer: &'a AccountInfo<'info>,
-) -> ProgramResult {
-    let rent = Rent::get()?;
-    if target_account.lamports().eq(&0) {
-        // If balance is zero, create account
-        solana_program::program::invoke_signed(
-            &solana_program::system_instruction::create_account(
-                payer.key,
-                target_account.key,
-                rent.minimum_balance(space),
-                space as u64,
-                owner,
-            ),
-            &[
-                payer.clone(),
-                target_account.clone(),
-                system_program.clone(),
-            ],
-            &[seeds],
-        )?;
-    } else {
-        // Otherwise, if balance is nonzero:
-
-        // 1) transfer sufficient lamports for rent exemption
-        let rent_exempt_balance = rent
-            .minimum_balance(space)
-            .saturating_sub(target_account.lamports());
-        if rent_exempt_balance.gt(&0) {
-            solana_program::program::invoke(
-                &solana_program::system_instruction::transfer(
-                    payer.key,
-                    target_account.key,
-                    rent_exempt_balance,
-                ),
-                &[
-                    payer.clone(),
-                    target_account.clone(),
-                    system_program.clone(),
-                ],
-            )?;
-        }
-
-        // 2) allocate space for the account
-        solana_program::program::invoke_signed(
-            &solana_program::system_instruction::allocate(target_account.key, space as u64),
-            &[target_account.clone(), system_program.clone()],
-            &[seeds],
-        )?;
-
-        // 3) assign our program as the owner
-        solana_program::program::invoke_signed(
-            &solana_program::system_instruction::assign(target_account.key, owner),
-            &[target_account.clone(), system_program.clone()],
-            &[seeds],
-        )?;
-    }
-
-    Ok(())
-}
-
-#[cfg(feature = "spl")]
-#[inline(always)]
-pub fn create_associated_token_account<'info>(
-    funder_info: &AccountInfo<'info>,
-    owner_info: &AccountInfo<'info>,
-    token_account_info: &AccountInfo<'info>,
-    mint_info: &AccountInfo<'info>,
-    system_program: &AccountInfo<'info>,
-    token_program: &AccountInfo<'info>,
-    associated_token_program: &AccountInfo<'info>,
-) -> ProgramResult {
-    solana_program::program::invoke(
-        &spl_associated_token_account::instruction::create_associated_token_account(
-            funder_info.key,
-            owner_info.key,
-            mint_info.key,
-            &spl_token::id(),
-        ),
-        &[
-            funder_info.clone(),
-            token_account_info.clone(),
-            owner_info.clone(),
-            mint_info.clone(),
-            system_program.clone(),
-            token_program.clone(),
-            associated_token_program.clone(),
-        ],
-    )
-}
-
-#[cfg(feature = "spl")]
-#[inline(always)]
-pub fn transfer<'info>(
-    authority_info: &AccountInfo<'info>,
-    from_info: &AccountInfo<'info>,
-    to_info: &AccountInfo<'info>,
-    token_program: &AccountInfo<'info>,
-    amount: u64,
-) -> ProgramResult {
-    solana_program::program::invoke(
-        &spl_token::instruction::transfer(
-            &spl_token::id(),
-            from_info.key,
-            to_info.key,
-            authority_info.key,
-            &[authority_info.key],
-            amount,
-        )?,
-        &[
-            token_program.clone(),
-            from_info.clone(),
-            to_info.clone(),
-            authority_info.clone(),
-        ],
-    )
-}
-
-#[cfg(feature = "spl")]
-#[inline(always)]
-pub fn transfer_signed<'info>(
-    authority_info: &AccountInfo<'info>,
-    from_info: &AccountInfo<'info>,
-    to_info: &AccountInfo<'info>,
-    token_program: &AccountInfo<'info>,
-    amount: u64,
-    signer_seeds: &[&[&[u8]]],
-) -> ProgramResult {
-    solana_program::program::invoke_signed(
-        &spl_token::instruction::transfer(
-            &spl_token::id(),
-            from_info.key,
-            to_info.key,
-            authority_info.key,
-            &[authority_info.key],
-            amount,
-        )?,
-        &[
-            token_program.clone(),
-            from_info.clone(),
-            to_info.clone(),
-            authority_info.clone(),
-        ],
-        signer_seeds,
-    )
-}
-
-#[cfg(feature = "spl")]
-#[inline(always)]
-pub fn mint_to_signed<'info>(
-    mint_info: &AccountInfo<'info>,
-    to_info: &AccountInfo<'info>,
-    authority_info: &AccountInfo<'info>,
-    token_program: &AccountInfo<'info>,
-    amount: u64,
-    signer_seeds: &[&[&[u8]]],
-) -> ProgramResult {
-    solana_program::program::invoke_signed(
-        &spl_token::instruction::mint_to(
-            &spl_token::id(),
-            mint_info.key,
-            to_info.key,
-            authority_info.key,
-            &[authority_info.key],
-            amount,
-        )?,
-        &[
-            token_program.clone(),
-            mint_info.clone(),
-            to_info.clone(),
-            authority_info.clone(),
-        ],
-        signer_seeds,
-    )
-}
-
-#[cfg(feature = "spl")]
-#[inline(always)]
-pub fn burn<'info>(
-    token_account_info: &AccountInfo<'info>,
-    mint_info: &AccountInfo<'info>,
-    authority_info: &AccountInfo<'info>,
-    token_program: &AccountInfo<'info>,
-    amount: u64,
-) -> ProgramResult {
-    solana_program::program::invoke(
-        &spl_token::instruction::burn(
-            &spl_token::id(),
-            token_account_info.key,
-            mint_info.key,
-            authority_info.key,
-            &[authority_info.key],
-            amount,
-        )?,
-        &[
-            token_program.clone(),
-            token_account_info.clone(),
-            mint_info.clone(),
-            authority_info.clone(),
-        ],
-    )
-}
+pub mod nostd;
+pub mod std;
diff --git a/lib/src/cpi/nostd.rs b/lib/src/cpi/nostd.rs
new file mode 100644
index 0000000..6356a8f
--- /dev/null
+++ b/lib/src/cpi/nostd.rs
@@ -0,0 +1,6 @@
+#![cfg(feature = "nostd")]
+pub mod common;
+pub mod invoke;
+pub mod system_program;
+
+pub use invoke::{cpi_invoke, cpi_invoke_signed};
diff --git a/lib/src/cpi/nostd/common.rs b/lib/src/cpi/nostd/common.rs
new file mode 100644
index 0000000..fc7a481
--- /dev/null
+++ b/lib/src/cpi/nostd/common.rs
@@ -0,0 +1,55 @@
+use solana_nostd_entrypoint::NoStdAccountInfo;
+use solana_program::{
+    entrypoint::ProgramResult, program_error::ProgramError, pubkey::Pubkey, rent::Rent,
+    sysvar::Sysvar,
+};
+
+use super::system_program::{allocate, assign, create_account, transfer};
+
+/// Creates a new pda.
+#[inline(always)]
+pub fn create_pda<'a, 'info>(
+    target_account: NoStdAccountInfo,
+    owner: &Pubkey,
+    space: usize,
+    pda_seeds: &[&[u8]],
+    system_program: NoStdAccountInfo,
+    payer: NoStdAccountInfo,
+) -> ProgramResult {
+    let rent = Rent::get()?;
+    let lamports = target_account
+        .try_borrow_lamports()
+        .ok_or(ProgramError::AccountBorrowFailed)?;
+    if lamports.eq(&0) {
+        // If balance is zero, create account
+        create_account(
+            &payer,
+            &target_account,
+            &system_program,
+            &lamports,
+            &(space as u64),
+            owner,
+        )?;
+    } else {
+        // Otherwise, if balance is nonzero:
+
+        // 1) transfer sufficient lamports for rent exemption
+        let rent_exempt_balance = rent.minimum_balance(space).saturating_sub(*lamports);
+        if rent_exempt_balance.gt(&0) {
+            transfer(
+                &payer,
+                &target_account,
+                &system_program,
+                &rent_exempt_balance,
+            )?;
+        }
+
+        // 2) allocate space for the account
+        allocate(&target_account, &system_program, &(space as u64), pda_seeds)?;
+
+        // 3) assign our program as the owner
+        assign(&target_account, owner, &system_program, pda_seeds)?;
+    }
+
+    Ok(())
+}
diff --git a/lib/src/cpi/nostd/invoke.rs b/lib/src/cpi/nostd/invoke.rs
new file mode 100644
index 0000000..51c4d48
--- /dev/null
+++ b/lib/src/cpi/nostd/invoke.rs
@@ -0,0 +1,53 @@
+use solana_nostd_entrypoint::{
+    solana_program::entrypoint::ProgramResult, AccountInfoC, InstructionC,
+};
+
+/// Use when the caller *has no* PDA signers.
+#[inline]
+pub fn cpi_invoke<const N: usize>(
+    instruction: InstructionC,
+    infos: &[AccountInfoC; N],
+) -> ProgramResult {
+    let pda_seeds: &[&[&[u8]]] = &[];
+
+    #[cfg(target_os = "solana")]
+    unsafe {
+        solana_nostd_entrypoint::solana_program::syscalls::sol_invoke_signed_c(
+            &instruction as *const InstructionC as *const u8,
+            infos.as_ptr() as *const u8,
+            infos.len() as u64,
+            pda_seeds.as_ptr() as *const u8,
+            0,
+        );
+    }
+
+    // For clippy
+    #[cfg(not(target_os = "solana"))]
+    core::hint::black_box(&(&instruction, &infos, &pda_seeds));
+    Ok(())
+}
+
+/// Use when the caller *has* PDA signers.
+#[inline]
+pub fn cpi_invoke_signed<const N: usize>(
+    instruction: InstructionC,
+    infos: &[AccountInfoC; N],
+    pda_seeds: &[&[u8]],
+) -> ProgramResult {
+    // If balance is zero, create account
+    #[cfg(target_os = "solana")]
+    unsafe {
+        solana_nostd_entrypoint::solana_program::syscalls::sol_invoke_signed_c(
+            &instruction as *const InstructionC as *const u8,
+            infos.as_ptr() as *const u8,
+            infos.len() as u64,
+            pda_seeds.as_ptr() as *const u8,
+            pda_seeds.len() as u64,
+        );
+    }
+
+    // For clippy
+    #[cfg(not(target_os = "solana"))]
+    core::hint::black_box(&(&instruction, &infos, &pda_seeds));
+    Ok(())
+}
diff --git a/lib/src/cpi/nostd/system_program.rs b/lib/src/cpi/nostd/system_program.rs
new file mode 100644
index 0000000..4a7c261
--- /dev/null
+++ b/lib/src/cpi/nostd/system_program.rs
@@ -0,0 +1,215 @@
+use num_enum::{IntoPrimitive, TryFromPrimitive};
+use solana_nostd_entrypoint::{AccountInfoC, InstructionC, NoStdAccountInfo};
+use solana_program::{entrypoint::ProgramResult, pubkey::Pubkey, system_program};
+
+use super::{cpi_invoke, cpi_invoke_signed};
+
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, TryFromPrimitive, IntoPrimitive)]
+pub enum SystemInstruction {
+    CreateAccount = 0,
+    Assign,
+    Transfer,
+    CreateAccountWithSeed,
+    AdvanceNonceAccount,
+    WithdrawNonceAccount,
+    InitializeNonceAccount,
+    AuthorizeNonceAccount,
+    Allocate,
+    AllocateWithSeed,
+    AssignWithSeed,
+    TransferWithSeed,
+    UpgradeNonceAccount,
+}
+
+#[inline]
+fn create_account_ix_data(lamports: &u64, space: &u64, owner: [u8; 32]) -> [u8; 52] {
+    let mut instruction_data = [0; 52];
+    instruction_data[0] = SystemInstruction::CreateAccount.into();
+    instruction_data[4..12].copy_from_slice(&lamports.to_le_bytes());
+    instruction_data[12..20].copy_from_slice(&space.to_le_bytes());
+    instruction_data[20..52].copy_from_slice(&owner);
+    instruction_data
+}
+
+#[inline]
+pub fn create_account_instruction(
+    payer: &NoStdAccountInfo,
+    pubkey: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    lamports: &u64,
+    space: &u64,
+    owner: [u8; 32],
+) -> (InstructionC, [AccountInfoC; 3]) {
+    let instruction_data = create_account_ix_data(lamports, space, owner);
+    let instruction_accounts = [payer.to_meta_c(), pubkey.to_meta_c()];
+
+    let instruction = InstructionC {
+        program_id: &system_program::ID,
+        accounts: instruction_accounts.as_ptr(),
+        accounts_len: instruction_accounts.len() as u64,
+        data: instruction_data.as_ptr(),
+        data_len: instruction_data.len() as u64,
+    };
+
+    let infos = [
+        payer.to_info_c(),
+        pubkey.to_info_c(),
+        system_program.to_info_c(),
+    ];
+    (instruction, infos)
+}
+
+pub fn create_account(
+    payer: &NoStdAccountInfo,
+    pubkey: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    lamports: &u64,
+    space: &u64,
+    owner: &Pubkey,
+) -> ProgramResult {
+    let (instruction, infos) = create_account_instruction(
+        payer,
+        pubkey,
+        system_program,
+        lamports,
+        space,
+        owner.to_bytes(),
+    );
+    cpi_invoke(instruction, &infos)
+}
+
+#[inline]
+fn transfer_ix_data(amount: &u64) -> [u8; 12] {
+    let mut instruction_data = [0; 12];
+    instruction_data[0] = SystemInstruction::Transfer.into();
+    instruction_data[4..12].copy_from_slice(&amount.to_le_bytes());
+    instruction_data
+}
+
+#[inline]
+pub fn transfer_instruction(
+    from: &NoStdAccountInfo,
+    to: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    amount: &u64,
+) -> (InstructionC, [AccountInfoC; 3]) {
+    let instruction_data = transfer_ix_data(amount);
+    let instruction_accounts = [from.to_meta_c(), to.to_meta_c()];
+
+    let instruction = InstructionC {
+        program_id: &system_program::ID,
+        accounts: instruction_accounts.as_ptr(),
+        accounts_len: instruction_accounts.len() as u64,
+        data: instruction_data.as_ptr(),
+        data_len: instruction_data.len() as u64,
+    };
+
+    let infos = [from.to_info_c(), to.to_info_c(), system_program.to_info_c()];
+    (instruction, infos)
+}
+
+/// When `from` *is not* a PDA.
+pub fn transfer(
+    from: &NoStdAccountInfo,
+    to: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    amount: &u64,
+) -> ProgramResult {
+    let (instruction, infos) = transfer_instruction(from, to, system_program, amount);
+    cpi_invoke(instruction, &infos)
+}
+
+/// When `from` *is* a PDA.
+pub fn transfer_signed(
+    from: &NoStdAccountInfo,
+    to: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    amount: &u64,
+    pda_seeds: &[&[u8]],
+) -> ProgramResult {
+    let (instruction, infos) = transfer_instruction(from, to, system_program, amount);
+    cpi_invoke_signed(instruction, &infos, pda_seeds)
+}
+
+#[inline]
+fn allocate_ix_data(space: &u64) -> [u8; 12] {
+    let mut instruction_data = [0; 12];
+    instruction_data[0] = SystemInstruction::Allocate.into();
+    instruction_data[4..12].copy_from_slice(&space.to_le_bytes());
+    instruction_data
+}
+
+#[inline]
+pub fn allocate_instruction(
+    target_account: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    space: &u64,
+) -> (InstructionC, [AccountInfoC; 2]) {
+    let instruction_data = allocate_ix_data(space);
+    let instruction_accounts = [target_account.to_meta_c()];
+
+    // Build instruction expected by sol_invoke_signed_c
+    let instruction = InstructionC {
+        program_id: &system_program::ID,
+        accounts: instruction_accounts.as_ptr(),
+        accounts_len: instruction_accounts.len() as u64,
+        data: instruction_data.as_ptr(),
+        data_len: instruction_data.len() as u64,
+    };
+
+    // Get infos and seeds
+    let infos = [target_account.to_info_c(), system_program.to_info_c()];
+    (instruction, infos)
+}
+
+pub fn allocate(
+    target_account: &NoStdAccountInfo,
+    system_program: &NoStdAccountInfo,
+    space: &u64,
+    pda_seeds: &[&[u8]],
+) -> ProgramResult {
+    let (instruction, infos) = allocate_instruction(target_account, system_program, space);
+    cpi_invoke_signed(instruction, &infos, pda_seeds)
+}
+
+#[inline]
+fn assign_ix_data(owner: [u8; 32]) -> [u8; 36] {
+    let mut instruction_data = [0; 36];
+    instruction_data[0] = SystemInstruction::Assign.into();
+    instruction_data[4..36].copy_from_slice(&owner);
+    instruction_data
+}
+
+#[inline]
+pub fn assign_instruction(
+    pubkey: &NoStdAccountInfo,
+    owner: &Pubkey,
+    system_program: &NoStdAccountInfo,
+) -> (InstructionC, [AccountInfoC; 2]) {
+    let instruction_data = assign_ix_data(owner.to_bytes());
+    let instruction_accounts = [pubkey.to_meta_c()];
+
+    // Build instruction expected by sol_invoke_signed_c
+    let instruction = InstructionC {
+        program_id: &system_program::ID,
+        accounts: instruction_accounts.as_ptr(),
+        accounts_len: instruction_accounts.len() as u64,
+        data: instruction_data.as_ptr(),
+        data_len: instruction_data.len() as u64,
+    };
+
+    // Get infos and seeds
+    let infos = [pubkey.to_info_c(), system_program.to_info_c()];
+    (instruction, infos)
+}
+
+pub fn assign(
+    pubkey: &NoStdAccountInfo,
+    owner: &Pubkey,
+    system_program: &NoStdAccountInfo,
+    pda_seeds: &[&[u8]],
+) -> ProgramResult {
+    let (instruction, infos) = assign_instruction(pubkey, owner, system_program);
+    cpi_invoke_signed(instruction, &infos, pda_seeds)
+}
diff --git a/lib/src/cpi/std.rs b/lib/src/cpi/std.rs
new file mode 100644
index 0000000..17a35a9
--- /dev/null
+++ b/lib/src/cpi/std.rs
@@ -0,0 +1,244 @@
+#![cfg(not(feature = "nostd"))]
+use bytemuck::Pod;
+use solana_program::{
+    account_info::AccountInfo, entrypoint::ProgramResult, pubkey::Pubkey, rent::Rent,
+    sysvar::Sysvar,
+};
+
+use crate::Discriminator;
+
+/// Creates a new program account.
+#[inline(always)]
+pub fn create_account<'a, 'info, T: Discriminator + Pod>(
+    target_account: &'a AccountInfo<'info>,
+    owner: &Pubkey,
+    seeds: &[&[u8]],
+    system_program: &'a AccountInfo<'info>,
+    payer: &'a AccountInfo<'info>,
+) -> ProgramResult {
+    // Allocate space.
+    allocate_account(
+        target_account,
+        owner,
+        8 + std::mem::size_of::<T>(),
+        seeds,
+        system_program,
+        payer,
+    )?;
+
+    // Set discriminator.
+    let mut data = target_account.data.borrow_mut();
+    data[0] = T::discriminator();
+
+    Ok(())
+}
+
+/// Allocates space for a new program account.
+#[inline(always)]
+pub fn allocate_account<'a, 'info>(
+    target_account: &'a AccountInfo<'info>,
+    owner: &Pubkey,
+    space: usize,
+    seeds: &[&[u8]],
+    system_program: &'a AccountInfo<'info>,
+    payer: &'a AccountInfo<'info>,
+) -> ProgramResult {
+    let rent = Rent::get()?;
+    if target_account.lamports().eq(&0) {
+        // If balance is zero, create account
+        solana_program::program::invoke_signed(
+            &solana_program::system_instruction::create_account(
+                payer.key,
+                target_account.key,
+                rent.minimum_balance(space),
+                space as u64,
+                owner,
+            ),
+            &[
+                payer.clone(),
+                target_account.clone(),
+                system_program.clone(),
+            ],
+            &[seeds],
+        )?;
+    } else {
+        // Otherwise, if balance is nonzero:
+
+        // 1) transfer sufficient lamports for rent exemption
+        let rent_exempt_balance = rent
+            .minimum_balance(space)
+            .saturating_sub(target_account.lamports());
+        if rent_exempt_balance.gt(&0) {
+            solana_program::program::invoke(
+                &solana_program::system_instruction::transfer(
+                    payer.key,
+                    target_account.key,
+                    rent_exempt_balance,
+                ),
+                &[
+                    payer.clone(),
+                    target_account.clone(),
+                    system_program.clone(),
+                ],
+            )?;
+        }
+
+        // 2) allocate space for the account
+        solana_program::program::invoke_signed(
+            &solana_program::system_instruction::allocate(target_account.key, space as u64),
+            &[target_account.clone(), system_program.clone()],
+            &[seeds],
+        )?;
+
+        // 3) assign our program as the owner
+        solana_program::program::invoke_signed(
+            &solana_program::system_instruction::assign(target_account.key, owner),
+            &[target_account.clone(), system_program.clone()],
+            &[seeds],
+        )?;
+    }
+
+    Ok(())
+}
+
+#[cfg(feature = "spl")]
+#[inline(always)]
+pub fn create_associated_token_account<'info>(
+    funder_info: &AccountInfo<'info>,
+    owner_info: &AccountInfo<'info>,
+    token_account_info: &AccountInfo<'info>,
+    mint_info: &AccountInfo<'info>,
+    system_program: &AccountInfo<'info>,
+    token_program: &AccountInfo<'info>,
+    associated_token_program: &AccountInfo<'info>,
+) -> ProgramResult {
+    solana_program::program::invoke(
+        &spl_associated_token_account::instruction::create_associated_token_account(
+            funder_info.key,
+            owner_info.key,
+            mint_info.key,
+            &spl_token::id(),
+        ),
+        &[
+            funder_info.clone(),
+            token_account_info.clone(),
+            owner_info.clone(),
+            mint_info.clone(),
+            system_program.clone(),
+            token_program.clone(),
+            associated_token_program.clone(),
+        ],
+    )
+}
+
+#[cfg(feature = "spl")]
+#[inline(always)]
+pub fn transfer<'info>(
+    authority_info: &AccountInfo<'info>,
+    from_info: &AccountInfo<'info>,
+    to_info: &AccountInfo<'info>,
+    token_program: &AccountInfo<'info>,
+    amount: u64,
+) -> ProgramResult {
+    solana_program::program::invoke(
+        &spl_token::instruction::transfer(
+            &spl_token::id(),
+            from_info.key,
+            to_info.key,
+            authority_info.key,
+            &[authority_info.key],
+            amount,
+        )?,
+        &[
+            token_program.clone(),
+            from_info.clone(),
+            to_info.clone(),
+            authority_info.clone(),
+        ],
+    )
+}
+
+#[cfg(feature = "spl")]
+#[inline(always)]
+pub fn transfer_signed<'info>(
+    authority_info: &AccountInfo<'info>,
+    from_info: &AccountInfo<'info>,
+    to_info: &AccountInfo<'info>,
+    token_program: &AccountInfo<'info>,
+    amount: u64,
+    signer_seeds: &[&[&[u8]]],
+) -> ProgramResult {
+    solana_program::program::invoke_signed(
+        &spl_token::instruction::transfer(
+            &spl_token::id(),
+            from_info.key,
+            to_info.key,
+            authority_info.key,
+            &[authority_info.key],
+            amount,
+        )?,
+        &[
+            token_program.clone(),
+            from_info.clone(),
+            to_info.clone(),
+            authority_info.clone(),
+        ],
+        signer_seeds,
+    )
+}
+
+#[cfg(feature = "spl")]
+#[inline(always)]
+pub fn mint_to_signed<'info>(
+    mint_info: &AccountInfo<'info>,
+    to_info: &AccountInfo<'info>,
+    authority_info: &AccountInfo<'info>,
+    token_program: &AccountInfo<'info>,
+    amount: u64,
+    signer_seeds: &[&[&[u8]]],
+) -> ProgramResult {
+    solana_program::program::invoke_signed(
+        &spl_token::instruction::mint_to(
+            &spl_token::id(),
+            mint_info.key,
+            to_info.key,
+            authority_info.key,
+            &[authority_info.key],
+            amount,
+        )?,
+        &[
+            token_program.clone(),
+            mint_info.clone(),
+            to_info.clone(),
+            authority_info.clone(),
+        ],
+        signer_seeds,
+    )
+}
+
+#[cfg(feature = "spl")]
+#[inline(always)]
+pub fn burn<'info>(
+    token_account_info: &AccountInfo<'info>,
+    mint_info: &AccountInfo<'info>,
+    authority_info: &AccountInfo<'info>,
+    token_program: &AccountInfo<'info>,
+    amount: u64,
+) -> ProgramResult {
+    solana_program::program::invoke(
+        &spl_token::instruction::burn(
+            &spl_token::id(),
+            token_account_info.key,
+            mint_info.key,
+            authority_info.key,
+            &[authority_info.key],
+            amount,
+        )?,
+        &[
+            token_program.clone(),
+            token_account_info.clone(),
+            mint_info.clone(),
+            authority_info.clone(),
+        ],
+    )
+}
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 6a07448..ae0c820 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -1,24 +1,35 @@
-mod cpi;
+pub mod cpi;
 mod loaders;
 pub mod macros;
 mod traits;
 mod utils;
 
-pub use cpi::*;
+pub use loaders::*;
 pub use traits::*;
 pub use utils::*;
 
 pub use bytemuck::{Pod, Zeroable};
 pub use num_enum::{IntoPrimitive, TryFromPrimitive};
+
 pub use solana_program::{
     account_info::AccountInfo,
     clock::Clock,
     declare_id, entrypoint,
     entrypoint::ProgramResult,
     instruction::{AccountMeta, Instruction},
+    log,
     program_error::ProgramError,
     pubkey::Pubkey,
     system_program, sysvar,
     sysvar::Sysvar,
 };
 pub use thiserror::Error;
+
+#[cfg(feature = "nostd")]
+pub use arrayvec::ArrayVec;
+#[cfg(feature = "nostd")]
+pub use solana_nostd_entrypoint::{
+    basic_panic_impl, entrypoint_nostd, entrypoint_nostd_no_duplicates,
+    entrypoint_nostd_no_duplicates_no_program, entrypoint_nostd_no_program, noalloc_allocator,
+    NoStdAccountInfo,
+};
diff --git a/lib/src/loaders.rs b/lib/src/loaders.rs
index 8bfe9b1..dfd1f08 100644
--- a/lib/src/loaders.rs
+++ b/lib/src/loaders.rs
@@ -1,3 +1,5 @@
+pub mod nostd;
+
 use bytemuck::Pod;
 #[cfg(feature = "spl")]
 use solana_program::program_pack::Pack;
diff --git a/lib/src/loaders/nostd.rs b/lib/src/loaders/nostd.rs
new file mode 100644
index 0000000..cfc5d25
--- /dev/null
+++ b/lib/src/loaders/nostd.rs
@@ -0,0 +1,161 @@
+#![cfg(feature = "nostd")]
+
+use bytemuck::Pod;
+use solana_nostd_entrypoint::NoStdAccountInfo;
+#[cfg(feature = "spl")]
+use solana_program::program_pack::Pack;
+use solana_program::{program_error::ProgramError, pubkey::Pubkey};
+
+use crate::{AccountDeserialize, AccountInfoValidation, Discriminator, ToAccount};
+
+impl AccountInfoValidation for NoStdAccountInfo {
+    fn is_signer(&self) -> Result<&Self, ProgramError> {
+        if !self.is_signer() {
+            return Err(ProgramError::MissingRequiredSignature);
+        }
+        Ok(self)
+    }
+
+    fn is_writable(&self) -> Result<&Self, ProgramError> {
+        if !self.is_writable() {
+            return Err(ProgramError::MissingRequiredSignature);
+        }
+        Ok(self)
+    }
+
+    fn is_executable(&self) -> Result<&Self, ProgramError> {
+        if !self.executable() {
+            return Err(ProgramError::InvalidAccountData);
+        }
+        Ok(self)
+    }
+
+    fn is_empty(&self) -> Result<&Self, ProgramError> {
+        let account_data = self
+            .try_borrow_data()
+            .ok_or(ProgramError::UninitializedAccount)?;
+        if account_data.is_empty() {
+            return Err(ProgramError::UninitializedAccount);
+        }
+        Ok(self)
+    }
+
+    fn is_program(&self, program_id: &Pubkey) -> Result<&Self, ProgramError> {
+        self.has_address(program_id)?.is_executable()
+    }
+
+    fn is_type<T: Discriminator>(&self, program_id: &Pubkey) -> Result<&Self, ProgramError> {
+        self.has_owner(program_id)?;
+        if self
+            .try_borrow_data()
+            .ok_or(ProgramError::AccountBorrowFailed)?[0]
+            .ne(&T::discriminator())
+        {
+            return Err(ProgramError::InvalidAccountData);
+        }
+        Ok(self)
+    }
+
+    fn has_owner(&self, owner: &Pubkey) -> Result<&Self, ProgramError> {
+        if self.owner().ne(owner) {
+            return Err(ProgramError::InvalidAccountOwner);
+        }
+        Ok(self)
+    }
+
+    fn has_address(&self, address: &Pubkey) -> Result<&Self, ProgramError> {
+        if self.key().ne(&address) {
+            return Err(ProgramError::InvalidAccountData);
+        }
+        Ok(self)
+    }
+
+    fn has_seeds(
+        &self,
+        seeds: &[&[u8]],
+        bump: u8,
+        program_id: &Pubkey,
+    ) -> Result<&Self, ProgramError> {
+        let pda = Pubkey::find_program_address(seeds, program_id);
+        if self.key().ne(&pda.0) || bump.ne(&pda.1) {
+            return Err(ProgramError::InvalidSeeds);
+        }
+        Ok(self)
+    }
+
+    fn is_sysvar(&self, sysvar_id: &Pubkey) -> Result<&Self, ProgramError> {
+        self.has_owner(&solana_program::sysvar::ID)?
+            .has_address(sysvar_id)
+    }
+}
+
+impl ToAccount for NoStdAccountInfo {
+    fn to_account<T: AccountDeserialize + Discriminator + Pod>(
+        &self,
+        program_id: &Pubkey,
+    ) -> Result<&T, ProgramError> {
+        unsafe {
+            self.has_owner(program_id)?;
+            T::try_from_bytes(std::slice::from_raw_parts(
+                self.try_borrow_data()
+                    .ok_or(ProgramError::AccountBorrowFailed)?
+                    .as_ptr(),
+                8 + std::mem::size_of::<T>(),
+            ))
+        }
+    }
+
+    fn to_account_mut<T: AccountDeserialize + Discriminator + Pod>(
+        &self,
+        program_id: &Pubkey,
+    ) -> Result<&mut T, ProgramError> {
+        if !self.is_writable() {
+            return Err(ProgramError::AccountBorrowFailed);
+        }
+        unsafe {
+            self.has_owner(program_id)?;
+            T::try_from_bytes_mut(std::slice::from_raw_parts_mut(
+                self.try_borrow_mut_data()
+                    .ok_or(ProgramError::AccountBorrowFailed)?
+                    .as_mut_ptr(),
+                8 + std::mem::size_of::<T>(),
+            ))
+        }
+    }
+}
+
+#[cfg(feature = "spl")]
+impl crate::ToSplToken for NoStdAccountInfo {
+    fn to_mint(&self) -> Result<spl_token::state::Mint, ProgramError> {
+        unsafe {
+            self.has_owner(&spl_token::ID)?;
+            spl_token::state::Mint::unpack(std::slice::from_raw_parts(
+                self.try_borrow_data()
+                    .ok_or(ProgramError::AccountBorrowFailed)?
+                    .as_ptr(),
+                spl_token::state::Mint::LEN,
+            ))
+        }
+    }
+    fn to_token_account(&self) -> Result<spl_token::state::Account, ProgramError> {
+        unsafe {
+            self.has_owner(&spl_token::ID)?;
+            spl_token::state::Account::unpack(std::slice::from_raw_parts(
+                self.try_borrow_data()
+                    .ok_or(ProgramError::AccountBorrowFailed)?
+                    .as_ptr(),
+                spl_token::state::Account::LEN,
+            ))
+        }
+    }
+    fn to_associated_token_account(
+        &self,
+        owner: &Pubkey,
+        mint: &Pubkey,
+    ) -> Result<spl_token::state::Account, ProgramError> {
+        self.has_address(&spl_associated_token_account::get_associated_token_address(
+            owner, mint,
+        ))?
+        .to_token_account()
+    }
+}