[PATCH] clover: Pass unquoted compiler arguments to Clang

[Vedran Miletić]

OpenCL apps can quote arguments they pass to the OpenCL compiler, most
commonly include paths containing spaces.

If the Clang OpenCL compiler was called via a shell, the shell would
split the arguments with respect to to quotes and then remove quotes
before passing the arguments to the compiler. Since we call Clang as a
library, we have to split the argument with respect to quotes and then
remove quotes before passing the arguments.

v2: move to tokenize(), remove throwing of CL_INVALID_COMPILER_OPTIONS
---
 src/gallium/state_trackers/clover/llvm/util.hpp | 37 ++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/src/gallium/state_trackers/clover/llvm/util.hpp b/src/gallium/state_trackers/clover/llvm/util.hpp
index 8db6f20..c149542 100644
--- a/src/gallium/state_trackers/clover/llvm/util.hpp
+++ b/src/gallium/state_trackers/clover/llvm/util.hpp
@@ -42,11 +42,40 @@ namespace clover {
       inline std::vector<std::string>
       tokenize(const std::string &s) {
          std::vector<std::string> ss;
-         std::istringstream iss(s);
-         std::string t;
+         std::ostringstream oss;
 
-         while (getline(iss, t, ' '))
-            ss.push_back(t);
+         // OpenCL programs can pass a single or double quoted argument, most
+         // frequently include path. This is useful so that the path containing
+         // spaces is treated as a single argument, but we should anyhow unquote
+         // quoted arguments before passing them to the compiler.
+         // We do not want to avoid using std::string::replace here, as include
+         // path can contain quotes in file names.
+         bool escape_next = false;
+         bool skip_space = false;
+         bool in_quote_double = false;
+         bool in_quote_single = false;
+         for (auto pos = std::begin(s); pos != std::end(s); ++pos) {
+            if (escape_next) {
+               oss.put(*pos);
+               escape_next = false;
+            } else if (*pos == '\\') {
+               escape_next = true;
+            } else if (*pos == '"' && !in_quote_single) {
+               in_quote_double = !in_quote_double;
+               skip_space = !skip_space;
+            } else if (*pos == '\'' && !in_quote_double) {
+               in_quote_single = !in_quote_single;
+               skip_space = !skip_space;
+            } else if (*pos == ' ' && !skip_space && oss.tellp() > 0) {
+               ss.emplace_back(oss.str());
+               oss.str("");
+            } else if (*pos != ' ' || skip_space) {
+               oss.put(*pos);
+            }
+         }
+         if (oss.tellp() > 0) {
+            ss.emplace_back(oss.str());
+         }
 
          return ss;
       }
-- 
2.7.4