program: rename bytecode load/write functions, track path of executed file

Extend source objects with a `runpath` field which contains the original
path of the source being executed by the VM.

When instantiating source objects from file paths, the `runpath` will be
set to the `filename`. When instantiating source buffers using
`uc_source_new_buffer()`, the runpath is initially unset.

A new function `uc_source_runpath_set()` can be used to adjust the runtime
path being associated with a source object.

Extend bytecode loading logic to set the source buffer runtime path to the
precompiled bytecode file path being loaded and executed. This is required
for `sourcepath()` and relative paths in `include()` to function correctly
when executing precompiled programs.

Finally rename `uc_program_from_file()` and `uc_program_to_file()` to
`uc_program_load()` and `uc_program_write()` respectively since the load
part now operates on an `uc_source_t` input buffer instead of a plain
`FILE *` handle.

Adjust users of these API functions accordingly.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 13 insertions, 0 deletions

diff --git a/source.c b/source.c
index 3b35b70..f2bd8bf 100644
--- a/source.c
+++ b/source.c
@@ -34,6 +34,7 @@ uc_source_new_file(const char *path)
 	src->fp = fp;
 	src->buffer = NULL;
 	src->filename = strcpy((char *)src + ALIGN(sizeof(*src)), path);
+	src->runpath = src->filename;
 
 	src->usecount = 1;
 
@@ -113,6 +114,9 @@ uc_source_put(uc_source_t *source)
 		return;
 	}
 
+	if (source->runpath != source->filename)
+		free(source->runpath);
+
 	uc_vector_clear(&source->lineinfo);
 	fclose(source->fp);
 	free(source->buffer);
@@ -211,3 +215,12 @@ uc_source_line_update(uc_source_t *source, size_t off)
 		}
 	}
 }
+
+void
+uc_source_runpath_set(uc_source_t *source, const char *runpath)
+{
+	if (source->runpath != source->filename)
+		free(source->runpath);
+
+	source->runpath = xstrdup(runpath);
+}