gallivm: rework debug printf hook to use global mapping.

Cached shaders require relinking, so hardcoding the pointer
can't work. This switches out the printf code to use new
proper API.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5049>

3 files changed, 9 insertions, 7 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.c b/src/gallium/auxiliary/gallivm/lp_bld_init.c
index e3fd26cd2ec..ce522806669 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.c
@@ -643,6 +643,9 @@ gallivm_compile_module(struct gallivm_state *gallivm)
 
    ++gallivm->compiled;
 
+   if (gallivm->debug_printf_hook)
+      LLVMAddGlobalMapping(gallivm->engine, gallivm->debug_printf_hook, debug_printf);
+
    if (gallivm_debug & GALLIVM_DEBUG_ASM) {
       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.h b/src/gallium/auxiliary/gallivm/lp_bld_init.h
index 1c0c627fb59..cebf6a793d5 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.h
@@ -54,6 +54,7 @@ struct gallivm_state
    unsigned compiled;
    LLVMValueRef coro_malloc_hook;
    LLVMValueRef coro_free_hook;
+   LLVMValueRef debug_printf_hook;
 };
 
 
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_printf.c b/src/gallium/auxiliary/gallivm/lp_bld_printf.c
index a4233a24e33..1772fd0e8cd 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_printf.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_printf.c
@@ -48,8 +48,6 @@ lp_build_print_args(struct gallivm_state* gallivm,
 {
    LLVMBuilderRef builder = gallivm->builder;
    LLVMContextRef context = gallivm->context;
-   LLVMValueRef func_printf;
-   LLVMTypeRef printf_type;
    int i;
 
    assert(args);
@@ -64,11 +62,11 @@ lp_build_print_args(struct gallivm_state* gallivm,
          args[i] = LLVMBuildFPExt(builder, args[i], LLVMDoubleTypeInContext(context), "");
    }
 
-   printf_type = LLVMFunctionType(LLVMInt32TypeInContext(context), NULL, 0, 1);
-   func_printf = lp_build_const_int_pointer(gallivm, func_to_pointer((func_pointer)debug_printf));
-   func_printf = LLVMBuildBitCast(builder, func_printf, LLVMPointerType(printf_type, 0), "debug_printf");
-
-   return LLVMBuildCall(builder, func_printf, args, argcount, "");
+   if (!gallivm->debug_printf_hook) {
+      LLVMTypeRef printf_type = LLVMFunctionType(LLVMInt32TypeInContext(context), NULL, 0, 1);
+      gallivm->debug_printf_hook = LLVMAddFunction(gallivm->module, "debug_printf", printf_type);
+   }
+   return LLVMBuildCall(builder, gallivm->debug_printf_hook, args, argcount, "");
 }