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authorBrian Paul <brianp@vmware.com>2010-12-16 10:13:02 -0700
committerBrian Paul <brianp@vmware.com>2010-12-16 10:19:16 -0700
commitee16e97ed1d0921c533c77688b278bef393d9922 (patch)
tree3ddbc79232669412d4538249b2040bebe7929800
parentb7e150605d402224cdd8fa3d186924bdee3c6c49 (diff)
gallivm: work around LLVM 2.6 bug when calling C functions
Create a constant int pointer to the C function, then cast it to the function's type. This avoids using trampoline code which seem to be inadvertantly freed by LLVM in some situations (which leads to segfaults). The root issue and work-around were found by José. NOTE: This is a candidate for the 7.10 branch
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_const.h18
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_format_aos.c54
2 files changed, 61 insertions, 11 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_const.h b/src/gallium/auxiliary/gallivm/lp_bld_const.h
index c749a7a3150..680211fbbd7 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_const.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_const.h
@@ -125,4 +125,22 @@ lp_build_const_float(struct gallivm_state *gallivm, float x)
}
+/** Return constant-valued pointer to int */
+static INLINE LLVMValueRef
+lp_build_const_int_pointer(struct gallivm_state *gallivm, const void *ptr)
+{
+ LLVMTypeRef int_type;
+ LLVMValueRef v;
+
+ /* int type large enough to hold a pointer */
+ int_type = LLVMIntTypeInContext(gallivm->context, 8 * sizeof(void *));
+ v = LLVMConstInt(int_type, (unsigned long long) ptr, 0);
+ v = LLVMBuildIntToPtr(gallivm->builder, v,
+ LLVMPointerType(int_type, 0),
+ "cast int to ptr");
+ return v;
+}
+
+
+
#endif /* !LP_BLD_CONST_H */
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_format_aos.c b/src/gallium/auxiliary/gallivm/lp_bld_format_aos.c
index 75d2e666f09..905cf66137c 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_format_aos.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_format_aos.c
@@ -36,6 +36,7 @@
#include "util/u_format.h"
#include "util/u_memory.h"
#include "util/u_math.h"
+#include "util/u_pointer.h"
#include "util/u_string.h"
#include "lp_bld_arit.h"
@@ -520,6 +521,7 @@ lp_build_fetch_rgba_aos(struct gallivm_state *gallivm,
LLVMValueRef tmp_ptr;
LLVMValueRef tmp;
LLVMValueRef res;
+ LLVMValueRef callee;
unsigned k;
util_snprintf(name, sizeof name, "util_format_%s_fetch_rgba_8unorm",
@@ -535,6 +537,10 @@ lp_build_fetch_rgba_aos(struct gallivm_state *gallivm,
function = LLVMGetNamedFunction(module, name);
if (!function) {
+ /*
+ * Function to call looks like:
+ * fetch(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+ */
LLVMTypeRef ret_type;
LLVMTypeRef arg_types[4];
LLVMTypeRef function_type;
@@ -542,19 +548,26 @@ lp_build_fetch_rgba_aos(struct gallivm_state *gallivm,
ret_type = LLVMVoidTypeInContext(gallivm->context);
arg_types[0] = pi8t;
arg_types[1] = pi8t;
- arg_types[3] = arg_types[2] = LLVMIntTypeInContext(gallivm->context, sizeof(unsigned) * 8);
- function_type = LLVMFunctionType(ret_type, arg_types, Elements(arg_types), 0);
+ arg_types[2] = i32t;
+ arg_types[3] = i32t;
+ function_type = LLVMFunctionType(ret_type, arg_types,
+ Elements(arg_types), 0);
function = LLVMAddFunction(module, name, function_type);
LLVMSetFunctionCallConv(function, LLVMCCallConv);
LLVMSetLinkage(function, LLVMExternalLinkage);
assert(LLVMIsDeclaration(function));
-
- LLVMAddGlobalMapping(gallivm->engine, function,
- func_to_pointer((func_pointer)format_desc->fetch_rgba_8unorm));
}
+ /* make const pointer for the C fetch_rgba_float function */
+ callee = lp_build_const_int_pointer(gallivm,
+ func_to_pointer((func_pointer) format_desc->fetch_rgba_float));
+
+ /* cast the callee pointer to the function's type */
+ function = LLVMBuildBitCast(builder, callee,
+ LLVMTypeOf(function), "cast callee");
+
tmp_ptr = lp_build_alloca(gallivm, i32t, "");
res = LLVMGetUndef(LLVMVectorType(i32t, num_pixels));
@@ -619,10 +632,13 @@ lp_build_fetch_rgba_aos(struct gallivm_state *gallivm,
LLVMTypeRef f32t = LLVMFloatTypeInContext(gallivm->context);
LLVMTypeRef f32x4t = LLVMVectorType(f32t, 4);
LLVMTypeRef pf32t = LLVMPointerType(f32t, 0);
+ LLVMTypeRef pi8t = LLVMPointerType(LLVMInt8TypeInContext(gallivm->context), 0);
+ LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context);
LLVMValueRef function;
LLVMValueRef tmp_ptr;
LLVMValueRef tmps[LP_MAX_VECTOR_LENGTH/4];
LLVMValueRef res;
+ LLVMValueRef callee;
unsigned k;
util_snprintf(name, sizeof name, "util_format_%s_fetch_rgba_float",
@@ -638,26 +654,42 @@ lp_build_fetch_rgba_aos(struct gallivm_state *gallivm,
function = LLVMGetNamedFunction(module, name);
if (!function) {
+ /*
+ * Function to call looks like:
+ * fetch(float *dst, const uint8_t *src, unsigned i, unsigned j)
+ */
LLVMTypeRef ret_type;
LLVMTypeRef arg_types[4];
LLVMTypeRef function_type;
ret_type = LLVMVoidTypeInContext(gallivm->context);
arg_types[0] = pf32t;
- arg_types[1] = LLVMPointerType(LLVMInt8TypeInContext(gallivm->context), 0);
- arg_types[3] = arg_types[2] = LLVMIntTypeInContext(gallivm->context, sizeof(unsigned) * 8);
- function_type = LLVMFunctionType(ret_type, arg_types, Elements(arg_types), 0);
+ arg_types[1] = pi8t;
+ arg_types[2] = i32t;
+ arg_types[3] = i32t;
+ function_type = LLVMFunctionType(ret_type, arg_types,
+ Elements(arg_types), 0);
function = LLVMAddFunction(module, name, function_type);
LLVMSetFunctionCallConv(function, LLVMCCallConv);
LLVMSetLinkage(function, LLVMExternalLinkage);
assert(LLVMIsDeclaration(function));
-
- LLVMAddGlobalMapping(gallivm->engine, function,
- func_to_pointer((func_pointer)format_desc->fetch_rgba_float));
}
+ /* Note: we're using this casting here instead of LLVMAddGlobalMapping()
+ * to work around a bug in LLVM 2.6.
+ */
+
+ /* make const pointer for the C fetch_rgba_float function */
+ callee = lp_build_const_int_pointer(gallivm,
+ func_to_pointer((func_pointer) format_desc->fetch_rgba_float));
+
+ /* cast the callee pointer to the function's type */
+ function = LLVMBuildBitCast(builder, callee,
+ LLVMTypeOf(function), "cast callee");
+
+
tmp_ptr = lp_build_alloca(gallivm, f32x4t, "");
/*